diff options
Diffstat (limited to 'winsup/bz2lib')
50 files changed, 0 insertions, 51846 deletions
diff --git a/winsup/bz2lib/CHANGES b/winsup/bz2lib/CHANGES deleted file mode 100644 index ecaf417..0000000 --- a/winsup/bz2lib/CHANGES +++ /dev/null @@ -1,167 +0,0 @@ - - -0.9.0 -~~~~~ -First version. - - -0.9.0a -~~~~~~ -Removed 'ranlib' from Makefile, since most modern Unix-es -don't need it, or even know about it. - - -0.9.0b -~~~~~~ -Fixed a problem with error reporting in bzip2.c. This does not effect -the library in any way. Problem is: versions 0.9.0 and 0.9.0a (of the -program proper) compress and decompress correctly, but give misleading -error messages (internal panics) when an I/O error occurs, instead of -reporting the problem correctly. This shouldn't give any data loss -(as far as I can see), but is confusing. - -Made the inline declarations disappear for non-GCC compilers. - - -0.9.0c -~~~~~~ -Fixed some problems in the library pertaining to some boundary cases. -This makes the library behave more correctly in those situations. The -fixes apply only to features (calls and parameters) not used by -bzip2.c, so the non-fixedness of them in previous versions has no -effect on reliability of bzip2.c. - -In bzlib.c: - * made zero-length BZ_FLUSH work correctly in bzCompress(). - * fixed bzWrite/bzRead to ignore zero-length requests. - * fixed bzread to correctly handle read requests after EOF. - * wrong parameter order in call to bzDecompressInit in - bzBuffToBuffDecompress. Fixed. - -In compress.c: - * changed setting of nGroups in sendMTFValues() so as to - do a bit better on small files. This _does_ effect - bzip2.c. - - -0.9.5a -~~~~~~ -Major change: add a fallback sorting algorithm (blocksort.c) -to give reasonable behaviour even for very repetitive inputs. -Nuked --repetitive-best and --repetitive-fast since they are -no longer useful. - -Minor changes: mostly a whole bunch of small changes/ -bugfixes in the driver (bzip2.c). Changes pertaining to the -user interface are: - - allow decompression of symlink'd files to stdout - decompress/test files even without .bz2 extension - give more accurate error messages for I/O errors - when compressing/decompressing to stdout, don't catch control-C - read flags from BZIP2 and BZIP environment variables - decline to break hard links to a file unless forced with -f - allow -c flag even with no filenames - preserve file ownerships as far as possible - make -s -1 give the expected block size (100k) - add a flag -q --quiet to suppress nonessential warnings - stop decoding flags after --, so files beginning in - can be handled - resolved inconsistent naming: bzcat or bz2cat ? - bzip2 --help now returns 0 - -Programming-level changes are: - - fixed syntax error in GET_LL4 for Borland C++ 5.02 - let bzBuffToBuffDecompress return BZ_DATA_ERROR{_MAGIC} - fix overshoot of mode-string end in bzopen_or_bzdopen - wrapped bzlib.h in #ifdef __cplusplus ... extern "C" { ... } - close file handles under all error conditions - added minor mods so it compiles with DJGPP out of the box - fixed Makefile so it doesn't give problems with BSD make - fix uninitialised memory reads in dlltest.c - -0.9.5b -~~~~~~ -Open stdin/stdout in binary mode for DJGPP. - -0.9.5c -~~~~~~ -Changed BZ_N_OVERSHOOT to be ... + 2 instead of ... + 1. The + 1 -version could cause the sorted order to be wrong in some extremely -obscure cases. Also changed setting of quadrant in blocksort.c. - -0.9.5d -~~~~~~ -The only functional change is to make bzlibVersion() in the library -return the correct string. This has no effect whatsoever on the -functioning of the bzip2 program or library. Added a couple of casts -so the library compiles without warnings at level 3 in MS Visual -Studio 6.0. Included a Y2K statement in the file Y2K_INFO. All other -changes are minor documentation changes. - -1.0 -~~~ -Several minor bugfixes and enhancements: - -* Large file support. The library uses 64-bit counters to - count the volume of data passing through it. bzip2.c - is now compiled with -D_FILE_OFFSET_BITS=64 to get large - file support from the C library. -v correctly prints out - file sizes greater than 4 gigabytes. All these changes have - been made without assuming a 64-bit platform or a C compiler - which supports 64-bit ints, so, except for the C library - aspect, they are fully portable. - -* Decompression robustness. The library/program should be - robust to any corruption of compressed data, detecting and - handling _all_ corruption, instead of merely relying on - the CRCs. What this means is that the program should - never crash, given corrupted data, and the library should - always return BZ_DATA_ERROR. - -* Fixed an obscure race-condition bug only ever observed on - Solaris, in which, if you were very unlucky and issued - control-C at exactly the wrong time, both input and output - files would be deleted. - -* Don't run out of file handles on test/decompression when - large numbers of files have invalid magic numbers. - -* Avoid library namespace pollution. Prefix all exported - symbols with BZ2_. - -* Minor sorting enhancements from my DCC2000 paper. - -* Advance the version number to 1.0, so as to counteract the - (false-in-this-case) impression some people have that programs - with version numbers less than 1.0 are in someway, experimental, - pre-release versions. - -* Create an initial Makefile-libbz2_so to build a shared library. - Yes, I know I should really use libtool et al ... - -* Make the program exit with 2 instead of 0 when decompression - fails due to a bad magic number (ie, an invalid bzip2 header). - Also exit with 1 (as the manual claims :-) whenever a diagnostic - message would have been printed AND the corresponding operation - is aborted, for example - bzip2: Output file xx already exists. - When a diagnostic message is printed but the operation is not - aborted, for example - bzip2: Can't guess original name for wurble -- using wurble.out - then the exit value 0 is returned, unless some other problem is - also detected. - - I think it corresponds more closely to what the manual claims now. - - -1.0.1 -~~~~~ -* Modified dlltest.c so it uses the new BZ2_ naming scheme. -* Modified makefile-msc to fix minor build probs on Win2k. -* Updated README.COMPILATION.PROBLEMS. - -There are no functionality changes or bug fixes relative to version -1.0.0. This is just a documentation update + a fix for minor Win32 -build problems. For almost everyone, upgrading from 1.0.0 to 1.0.1 is -utterly pointless. Don't bother. diff --git a/winsup/bz2lib/ChangeLog b/winsup/bz2lib/ChangeLog deleted file mode 100644 index c703a6e..0000000 --- a/winsup/bz2lib/ChangeLog +++ /dev/null @@ -1,11 +0,0 @@ -Wed Apr 18 23:54:53 2001 Christopher Faylor <cgf@cygnus.com> - - * Makefile.in: Add -U_WIN32 to CFLAGS compile line to avoid - inappropriate Windows-isms. - -Wed Apr 18 15:58:28 2001 Christopher Faylor <cgf@cygnus.com> - - Initial checkin from net sources. - Makefile.in: New file. - configure.in: New file. - configure: New file. diff --git a/winsup/bz2lib/LICENSE b/winsup/bz2lib/LICENSE deleted file mode 100644 index 88fa6d8..0000000 --- a/winsup/bz2lib/LICENSE +++ /dev/null @@ -1,39 +0,0 @@ - -This program, "bzip2" and associated library "libbzip2", are -copyright (C) 1996-2000 Julian R Seward. All rights reserved. - -Redistribution and use in source and binary forms, with or without -modification, are permitted provided that the following conditions -are met: - -1. Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - -2. The origin of this software must not be misrepresented; you must - not claim that you wrote the original software. If you use this - software in a product, an acknowledgment in the product - documentation would be appreciated but is not required. - -3. Altered source versions must be plainly marked as such, and must - not be misrepresented as being the original software. - -4. The name of the author may not be used to endorse or promote - products derived from this software without specific prior written - permission. - -THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS -OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED -WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE -ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY -DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL -DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE -GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS -INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, -WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING -NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS -SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - -Julian Seward, Cambridge, UK. -jseward@acm.org -bzip2/libbzip2 version 1.0 of 21 March 2000 - diff --git a/winsup/bz2lib/Makefile b/winsup/bz2lib/Makefile deleted file mode 100644 index ab17f49..0000000 --- a/winsup/bz2lib/Makefile +++ /dev/null @@ -1,141 +0,0 @@ - -SHELL=/bin/sh -CC=gcc -BIGFILES=-D_FILE_OFFSET_BITS=64 -CFLAGS=-Wall -Winline -O2 -fomit-frame-pointer -fno-strength-reduce $(BIGFILES) - -OBJS= blocksort.o \ - huffman.o \ - crctable.o \ - randtable.o \ - compress.o \ - decompress.o \ - bzlib.o - -all: libbz2.a bzip2 bzip2recover test - -bzip2: libbz2.a bzip2.o - $(CC) $(CFLAGS) -o bzip2 bzip2.o -L. -lbz2 - -bzip2recover: bzip2recover.o - $(CC) $(CFLAGS) -o bzip2recover bzip2recover.o - -libbz2.a: $(OBJS) - rm -f libbz2.a - ar cq libbz2.a $(OBJS) - @if ( test -f /usr/bin/ranlib -o -f /bin/ranlib -o \ - -f /usr/ccs/bin/ranlib ) ; then \ - echo ranlib libbz2.a ; \ - ranlib libbz2.a ; \ - fi - -test: bzip2 - @cat words1 - ./bzip2 -1 < sample1.ref > sample1.rb2 - ./bzip2 -2 < sample2.ref > sample2.rb2 - ./bzip2 -3 < sample3.ref > sample3.rb2 - ./bzip2 -d < sample1.bz2 > sample1.tst - ./bzip2 -d < sample2.bz2 > sample2.tst - ./bzip2 -ds < sample3.bz2 > sample3.tst - cmp sample1.bz2 sample1.rb2 - cmp sample2.bz2 sample2.rb2 - cmp sample3.bz2 sample3.rb2 - cmp sample1.tst sample1.ref - cmp sample2.tst sample2.ref - cmp sample3.tst sample3.ref - @cat words3 - -PREFIX=/usr - -install: bzip2 bzip2recover - if ( test ! -d $(PREFIX)/bin ) ; then mkdir $(PREFIX)/bin ; fi - if ( test ! -d $(PREFIX)/lib ) ; then mkdir $(PREFIX)/lib ; fi - if ( test ! -d $(PREFIX)/man ) ; then mkdir $(PREFIX)/man ; fi - if ( test ! -d $(PREFIX)/man/man1 ) ; then mkdir $(PREFIX)/man/man1 ; fi - if ( test ! -d $(PREFIX)/include ) ; then mkdir $(PREFIX)/include ; fi - cp -f bzip2 $(PREFIX)/bin/bzip2 - cp -f bzip2 $(PREFIX)/bin/bunzip2 - cp -f bzip2 $(PREFIX)/bin/bzcat - cp -f bzip2recover $(PREFIX)/bin/bzip2recover - chmod a+x $(PREFIX)/bin/bzip2 - chmod a+x $(PREFIX)/bin/bunzip2 - chmod a+x $(PREFIX)/bin/bzcat - chmod a+x $(PREFIX)/bin/bzip2recover - cp -f bzip2.1 $(PREFIX)/man/man1 - chmod a+r $(PREFIX)/man/man1/bzip2.1 - cp -f bzlib.h $(PREFIX)/include - chmod a+r $(PREFIX)/include/bzlib.h - cp -f libbz2.a $(PREFIX)/lib - chmod a+r $(PREFIX)/lib/libbz2.a - -clean: - rm -f *.o libbz2.a bzip2 bzip2recover \ - sample1.rb2 sample2.rb2 sample3.rb2 \ - sample1.tst sample2.tst sample3.tst - -blocksort.o: blocksort.c - @cat words0 - $(CC) $(CFLAGS) -c blocksort.c -huffman.o: huffman.c - $(CC) $(CFLAGS) -c huffman.c -crctable.o: crctable.c - $(CC) $(CFLAGS) -c crctable.c -randtable.o: randtable.c - $(CC) $(CFLAGS) -c randtable.c -compress.o: compress.c - $(CC) $(CFLAGS) -c compress.c -decompress.o: decompress.c - $(CC) $(CFLAGS) -c decompress.c -bzlib.o: bzlib.c - $(CC) $(CFLAGS) -c bzlib.c -bzip2.o: bzip2.c - $(CC) $(CFLAGS) -c bzip2.c -bzip2recover.o: bzip2recover.c - $(CC) $(CFLAGS) -c bzip2recover.c - -DISTNAME=bzip2-1.0.1 -tarfile: - rm -f $(DISTNAME) - ln -sf . $(DISTNAME) - tar cvf $(DISTNAME).tar \ - $(DISTNAME)/blocksort.c \ - $(DISTNAME)/huffman.c \ - $(DISTNAME)/crctable.c \ - $(DISTNAME)/randtable.c \ - $(DISTNAME)/compress.c \ - $(DISTNAME)/decompress.c \ - $(DISTNAME)/bzlib.c \ - $(DISTNAME)/bzip2.c \ - $(DISTNAME)/bzip2recover.c \ - $(DISTNAME)/bzlib.h \ - $(DISTNAME)/bzlib_private.h \ - $(DISTNAME)/Makefile \ - $(DISTNAME)/manual.texi \ - $(DISTNAME)/manual.ps \ - $(DISTNAME)/LICENSE \ - $(DISTNAME)/bzip2.1 \ - $(DISTNAME)/bzip2.1.preformatted \ - $(DISTNAME)/bzip2.txt \ - $(DISTNAME)/words0 \ - $(DISTNAME)/words1 \ - $(DISTNAME)/words2 \ - $(DISTNAME)/words3 \ - $(DISTNAME)/sample1.ref \ - $(DISTNAME)/sample2.ref \ - $(DISTNAME)/sample3.ref \ - $(DISTNAME)/sample1.bz2 \ - $(DISTNAME)/sample2.bz2 \ - $(DISTNAME)/sample3.bz2 \ - $(DISTNAME)/dlltest.c \ - $(DISTNAME)/*.html \ - $(DISTNAME)/README \ - $(DISTNAME)/README.COMPILATION.PROBLEMS \ - $(DISTNAME)/CHANGES \ - $(DISTNAME)/libbz2.def \ - $(DISTNAME)/libbz2.dsp \ - $(DISTNAME)/dlltest.dsp \ - $(DISTNAME)/makefile.msc \ - $(DISTNAME)/Y2K_INFO \ - $(DISTNAME)/unzcrash.c \ - $(DISTNAME)/spewG.c \ - $(DISTNAME)/Makefile-libbz2_so diff --git a/winsup/bz2lib/Makefile-libbz2_so b/winsup/bz2lib/Makefile-libbz2_so deleted file mode 100644 index a347c50..0000000 --- a/winsup/bz2lib/Makefile-libbz2_so +++ /dev/null @@ -1,43 +0,0 @@ - -# This Makefile builds a shared version of the library, -# libbz2.so.1.0.1, with soname libbz2.so.1.0, -# at least on x86-Linux (RedHat 5.2), -# with gcc-2.7.2.3. Please see the README file for some -# important info about building the library like this. - -SHELL=/bin/sh -CC=gcc -BIGFILES=-D_FILE_OFFSET_BITS=64 -CFLAGS=-fpic -fPIC -Wall -Winline -O2 -fomit-frame-pointer -fno-strength-reduce $(BIGFILES) - -OBJS= blocksort.o \ - huffman.o \ - crctable.o \ - randtable.o \ - compress.o \ - decompress.o \ - bzlib.o - -all: $(OBJS) - $(CC) -shared -Wl,-soname -Wl,libbz2.so.1.0 -o libbz2.so.1.0.1 $(OBJS) - $(CC) $(CFLAGS) -o bzip2-shared bzip2.c libbz2.so.1.0.1 - rm -f libbz2.so.1.0 - ln -s libbz2.so.1.0.1 libbz2.so.1.0 - -clean: - rm -f $(OBJS) bzip2.o libbz2.so.1.0.1 libbz2.so.1.0 bzip2-shared - -blocksort.o: blocksort.c - $(CC) $(CFLAGS) -c blocksort.c -huffman.o: huffman.c - $(CC) $(CFLAGS) -c huffman.c -crctable.o: crctable.c - $(CC) $(CFLAGS) -c crctable.c -randtable.o: randtable.c - $(CC) $(CFLAGS) -c randtable.c -compress.o: compress.c - $(CC) $(CFLAGS) -c compress.c -decompress.o: decompress.c - $(CC) $(CFLAGS) -c decompress.c -bzlib.o: bzlib.c - $(CC) $(CFLAGS) -c bzlib.c diff --git a/winsup/bz2lib/Makefile.in b/winsup/bz2lib/Makefile.in deleted file mode 100644 index 622445d..0000000 --- a/winsup/bz2lib/Makefile.in +++ /dev/null @@ -1,118 +0,0 @@ -# Copyright (c) 2000, Red Hat, Inc. -# -# This program is free software; you can redistribute it and/or modify -# it under the terms of the GNU General Public License as published by -# the Free Software Foundation; either version 2 of the License, or -# (at your option) any later version. -# -# A copy of the GNU General Public License can be found at -# http://www.gnu.org/ -# -# Written by Christopher Faylor <cgf@redhat.com> -# -# Makefile for Cygwin installer - -SHELL :=@SHELL@ - -srcdir:=@srcdir@ -VPATH:=@srcdir@ -prefix:=@prefix@ -exec_prefix:=@exec_prefix@ - -bindir:=@bindir@ -etcdir:=$(exec_prefix)/etc - -program_transform_name :=@program_transform_name@ - -INSTALL:=@INSTALL@ -INSTALL_PROGRAM:=@INSTALL_PROGRAM@ -INSTALL_DATA:=@INSTALL_DATA@ - -EXEEXT:=@EXEEXT@ -EXEEXT_FOR_BUILD :=@EXEEXT_FOR_BUILD@ - -CC:=@CC@ -CC_FOR_TARGET:=$(CC) -CXX:=@CXX@ - -CFLAGS:=@CFLAGS@ -nostdinc -CXXFLAGS:=@CXXFLAGS@ -fno-exceptions -fno-rtti -CXX:=@CXX@ - -WINDRES:=@WINDRES@ -OBJCOPY:=@OBJCOPY@ -AR:=@AR@ -RANLIB:=@RANLIB@ - -include $(srcdir)/../Makefile.common - -MINGW_INCLUDES:=-I. -I$(srcdir) -I$(mingw_source)/include -I$(w32api_include) -I$(updir)/bz2lib - -MINGW_CXXFLAGS:=-MMD $(CXXFLAGS) -mno-cygwin $(MINGW_INCLUDES) -mwindows -U_WIN32 -MINGW_CFLAGS:=-MMD $(CFLAGS) -mno-cygwin $(MINGW_INCLUDES) -mwindows -U_WIN32 - -ZLIB:=zlib/libzcygw.a -BZ2LIB:=$(bupdir)/bz2lib/libbz2.a -libmingw32.a:=$(mingw_build)/libmingw32.a -libuser32:=$(w32api_lib)/libuser32.a -libkernel32:=$(w32api_lib)/libkernel32.a - -ALL_DEP_LDLIBS:=$(ZLIB) $(BZ2LIB) $(w32api_lib)/libole32.a $(w32api_lib)/libwsock32.a \ - $(w32api_lib)/libnetapi32.a $(w32api_lib)/libadvapi32.a \ - $(w32api_lib)/libuuid.a $(libkernel32) $(w32api_lib)/libuser32.a \ - $(libmingw32) - -ALL_LDLIBS:=${patsubst $(mingw_build)/lib%.a,-l%,\ - ${patsubst $(w32api_lib)/lib%.a,-l%,\ - ${filter-out $(libmingw32),\ - ${filter-out $(libuser32),\ - ${filter-out $(libkernel32), $(ALL_DEP_LDLIBS)}}}}} - -ALL_LDFLAGS:=${filter-out -I%, \ - ${filter-out -W%, \ - -B$(w32api_lib)/ -B${mingw_build}/ $(MINGW_CFLAGS) $(LDFLAGS)}} - -LIBS:=libbz2.a - -OBJS:=blocksort.o bzlib.o compress.o decompress.o huffman.o crctable.o randtable.o - -.SUFFIXES: -.NOEXPORT: - -.PHONY: all install clean realclean - -all: Makefile $(LIBS) - -$(LIBS): $(OBJS) - $(AR) cru $@ $? - $(RANLIB) $@ - -clean: - rm -f *.o *.rc *.a - -realclean: clean - rm -f Makefile config.cache - -install: all -: Nothing to install - -%.o: %.c -ifdef VERBOSE - $(CC) $(MINGW_CFLAGS) -c -o $@ $< -else - @echo $(CC) -c $(CFLAGS) ... $(<F) - @$(CC) $(MINGW_CFLAGS) -c -o $@ $< -endif - -%.o: %.cc -ifdef VERBOSE - $(CXX) $(MINGW_CXXFLAGS) -c -o $@ $< -else - @echo $(CXX) -c $(CXXFLAGS) ... $(<F) - @$(CXX) $(MINGW_CXXFLAGS) -c -o $@ $< -endif - -D=$(wildcard *.d) -ifneq ($D,) -include $D -endif diff --git a/winsup/bz2lib/README b/winsup/bz2lib/README deleted file mode 100644 index 22945a2..0000000 --- a/winsup/bz2lib/README +++ /dev/null @@ -1,166 +0,0 @@ - -This is the README for bzip2, a block-sorting file compressor, version -1.0. This version is fully compatible with the previous public -releases, bzip2-0.1pl2, bzip2-0.9.0 and bzip2-0.9.5. - -bzip2-1.0 is distributed under a BSD-style license. For details, -see the file LICENSE. - -Complete documentation is available in Postscript form (manual.ps) or -html (manual_toc.html). A plain-text version of the manual page is -available as bzip2.txt. A statement about Y2K issues is now included -in the file Y2K_INFO. - - -HOW TO BUILD -- UNIX - -Type `make'. This builds the library libbz2.a and then the -programs bzip2 and bzip2recover. Six self-tests are run. -If the self-tests complete ok, carry on to installation: - -To install in /usr/bin, /usr/lib, /usr/man and /usr/include, type - make install -To install somewhere else, eg, /xxx/yyy/{bin,lib,man,include}, type - make install PREFIX=/xxx/yyy -If you are (justifiably) paranoid and want to see what 'make install' -is going to do, you can first do - make -n install or - make -n install PREFIX=/xxx/yyy respectively. -The -n instructs make to show the commands it would execute, but -not actually execute them. - - -HOW TO BUILD -- UNIX, shared library libbz2.so. - -Do 'make -f Makefile-libbz2_so'. This Makefile seems to work for -Linux-ELF (RedHat 5.2 on an x86 box), with gcc. I make no claims -that it works for any other platform, though I suspect it probably -will work for most platforms employing both ELF and gcc. - -bzip2-shared, a client of the shared library, is also build, but -not self-tested. So I suggest you also build using the normal -Makefile, since that conducts a self-test. - -Important note for people upgrading .so's from 0.9.0/0.9.5 to -version 1.0. All the functions in the library have been renamed, -from (eg) bzCompress to BZ2_bzCompress, to avoid namespace pollution. -Unfortunately this means that the libbz2.so created by -Makefile-libbz2_so will not work with any program which used an -older version of the library. Sorry. I do encourage library -clients to make the effort to upgrade to use version 1.0, since -it is both faster and more robust than previous versions. - - -HOW TO BUILD -- Windows 95, NT, DOS, Mac, etc. - -It's difficult for me to support compilation on all these platforms. -My approach is to collect binaries for these platforms, and put them -on the master web page (http://sourceware.cygnus.com/bzip2). Look -there. However (FWIW), bzip2-1.0 is very standard ANSI C and should -compile unmodified with MS Visual C. For Win32, there is one -important caveat: in bzip2.c, you must set BZ_UNIX to 0 and -BZ_LCCWIN32 to 1 before building. If you have difficulties building, -you might want to read README.COMPILATION.PROBLEMS. - - -VALIDATION - -Correct operation, in the sense that a compressed file can always be -decompressed to reproduce the original, is obviously of paramount -importance. To validate bzip2, I used a modified version of Mark -Nelson's churn program. Churn is an automated test driver which -recursively traverses a directory structure, using bzip2 to compress -and then decompress each file it encounters, and checking that the -decompressed data is the same as the original. There are more details -in Section 4 of the user guide. - - - -Please read and be aware of the following: - -WARNING: - - This program (attempts to) compress data by performing several - non-trivial transformations on it. Unless you are 100% familiar - with *all* the algorithms contained herein, and with the - consequences of modifying them, you should NOT meddle with the - compression or decompression machinery. Incorrect changes can and - very likely *will* lead to disastrous loss of data. - - -DISCLAIMER: - - I TAKE NO RESPONSIBILITY FOR ANY LOSS OF DATA ARISING FROM THE - USE OF THIS PROGRAM, HOWSOEVER CAUSED. - - Every compression of a file implies an assumption that the - compressed file can be decompressed to reproduce the original. - Great efforts in design, coding and testing have been made to - ensure that this program works correctly. However, the complexity - of the algorithms, and, in particular, the presence of various - special cases in the code which occur with very low but non-zero - probability make it impossible to rule out the possibility of bugs - remaining in the program. DO NOT COMPRESS ANY DATA WITH THIS - PROGRAM UNLESS YOU ARE PREPARED TO ACCEPT THE POSSIBILITY, HOWEVER - SMALL, THAT THE DATA WILL NOT BE RECOVERABLE. - - That is not to say this program is inherently unreliable. Indeed, - I very much hope the opposite is true. bzip2 has been carefully - constructed and extensively tested. - - -PATENTS: - - To the best of my knowledge, bzip2 does not use any patented - algorithms. However, I do not have the resources available to - carry out a full patent search. Therefore I cannot give any - guarantee of the above statement. - -End of legalities. - - -WHAT'S NEW IN 0.9.0 (as compared to 0.1pl2) ? - - * Approx 10% faster compression, 30% faster decompression - * -t (test mode) is a lot quicker - * Can decompress concatenated compressed files - * Programming interface, so programs can directly read/write .bz2 files - * Less restrictive (BSD-style) licensing - * Flag handling more compatible with GNU gzip - * Much more documentation, i.e., a proper user manual - * Hopefully, improved portability (at least of the library) - -WHAT'S NEW IN 0.9.5 ? - - * Compression speed is much less sensitive to the input - data than in previous versions. Specifically, the very - slow performance caused by repetitive data is fixed. - * Many small improvements in file and flag handling. - * A Y2K statement. - -WHAT'S NEW IN 1.0 - - See the CHANGES file. - -I hope you find bzip2 useful. Feel free to contact me at - jseward@acm.org -if you have any suggestions or queries. Many people mailed me with -comments, suggestions and patches after the releases of bzip-0.15, -bzip-0.21, bzip2-0.1pl2 and bzip2-0.9.0, and the changes in bzip2 are -largely a result of this feedback. I thank you for your comments. - -At least for the time being, bzip2's "home" is (or can be reached via) -http://www.muraroa.demon.co.uk. - -Julian Seward -jseward@acm.org - -Cambridge, UK -18 July 1996 (version 0.15) -25 August 1996 (version 0.21) - 7 August 1997 (bzip2, version 0.1) -29 August 1997 (bzip2, version 0.1pl2) -23 August 1998 (bzip2, version 0.9.0) - 8 June 1999 (bzip2, version 0.9.5) - 4 Sept 1999 (bzip2, version 0.9.5d) - 5 May 2000 (bzip2, version 1.0pre8) diff --git a/winsup/bz2lib/README.COMPILATION.PROBLEMS b/winsup/bz2lib/README.COMPILATION.PROBLEMS deleted file mode 100644 index d621ad5..0000000 --- a/winsup/bz2lib/README.COMPILATION.PROBLEMS +++ /dev/null @@ -1,130 +0,0 @@ - -bzip2-1.0 should compile without problems on the vast majority of -platforms. Using the supplied Makefile, I've built and tested it -myself for x86-linux, sparc-solaris, alpha-linux, x86-cygwin32 and -alpha-tru64unix. With makefile.msc, Visual C++ 6.0 and nmake, you can -build a native Win32 version too. Large file support seems to work -correctly on at least alpha-tru64unix and x86-cygwin32 (on Windows -2000). - -When I say "large file" I mean a file of size 2,147,483,648 (2^31) -bytes or above. Many older OSs can't handle files above this size, -but many newer ones can. Large files are pretty huge -- most files -you'll encounter are not Large Files. - -Earlier versions of bzip2 (0.1, 0.9.0, 0.9.5) compiled on a wide -variety of platforms without difficulty, and I hope this version will -continue in that tradition. However, in order to support large files, -I've had to include the define -D_FILE_OFFSET_BITS=64 in the Makefile. -This can cause problems. - -The technique of adding -D_FILE_OFFSET_BITS=64 to get large file -support is, as far as I know, the Recommended Way to get correct large -file support. For more details, see the Large File Support -Specification, published by the Large File Summit, at - http://www.sas.com/standard/large.file/ - -As a general comment, if you get compilation errors which you think -are related to large file support, try removing the above define from -the Makefile, ie, delete the line - BIGFILES=-D_FILE_OFFSET_BITS=64 -from the Makefile, and do 'make clean ; make'. This will give you a -version of bzip2 without large file support, which, for most -applications, is probably not a problem. - -Alternatively, try some of the platform-specific hints listed below. - -You can use the spewG.c program to generate huge files to test bzip2's -large file support, if you are feeling paranoid. Be aware though that -any compilation problems which affect bzip2 will also affect spewG.c, -alas. - - -Known problems as of 1.0pre8: -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -* HP/UX 10.20 and 11.00, using gcc (2.7.2.3 and 2.95.2): A large - number of warnings appear, including the following: - - /usr/include/sys/resource.h: In function `getrlimit': - /usr/include/sys/resource.h:168: - warning: implicit declaration of function `__getrlimit64' - /usr/include/sys/resource.h: In function `setrlimit': - /usr/include/sys/resource.h:170: - warning: implicit declaration of function `__setrlimit64' - - This would appear to be a problem with large file support, header - files and gcc. gcc may or may not give up at this point. If it - fails, you might be able to improve matters by adding - -D__STDC_EXT__=1 - to the BIGFILES variable in the Makefile (ie, change its definition - to - BIGFILES=-D_FILE_OFFSET_BITS=64 -D__STDC_EXT__=1 - - Even if gcc does produce a binary which appears to work (ie passes - its self-tests), you might want to test it to see if it works properly - on large files. - - -* HP/UX 10.20 and 11.00, using HP's cc compiler. - - No specific problems for this combination, except that you'll need to - specify the -Ae flag, and zap the gcc-specific stuff - -Wall -Winline -O2 -fomit-frame-pointer -fno-strength-reduce. - You should retain -D_FILE_OFFSET_BITS=64 in order to get large - file support -- which is reported to work ok for this HP/UX + cc - combination. - - -* SunOS 4.1.X. - - Amazingly, there are still people out there using this venerable old - banger. I shouldn't be too rude -- I started life on SunOS, and - it was a pretty darn good OS, way back then. Anyway: - - SunOS doesn't seem to have strerror(), so you'll have to use - perror(), perhaps by doing adding this (warning: UNTESTED CODE): - - char* strerror ( int errnum ) - { - if (errnum < 0 || errnum >= sys_nerr) - return "Unknown error"; - else - return sys_errlist[errnum]; - } - - Or you could comment out the relevant calls to strerror; they're - not mission-critical. Or you could upgrade to Solaris. Ha ha ha! - (what?? you think I've got Bad Attitude?) - - -* Making a shared library on Solaris. (Not really a compilation - problem, but many people ask ...) - - Firstly, if you have Solaris 8, either you have libbz2.so already - on your system, or you can install it from the Solaris CD. - - Secondly, be aware that there are potential naming conflicts - between the .so file supplied with Solaris 8, and the .so file - which Makefile-libbz2_so will make. Makefile-libbz2_so creates - a .so which has the names which I intend to be "official" as - of version 1.0.0 and onwards. Unfortunately, the .so in - Solaris 8 appeared before I decided on the final names, so - the two libraries are incompatible. We have since communicated - and I hope that the problems will have been solved in the next - version of Solaris, whenever that might appear. - - All that said: you might be able to get somewhere - by finding the line in Makefile-libbz2_so which says - - $(CC) -shared -Wl,-soname -Wl,libbz2.so.1.0 -o libbz2.so.1.0.1 $(OBJS) - - and replacing with - - ($CC) -G -shared -o libbz2.so.1.0.1 -h libbz2.so.1.0 $(OBJS) - - If gcc objects to the combination -fpic -fPIC, get rid of - the second one, leaving just "-fpic". - - -That's the end of the currently known compilation problems. diff --git a/winsup/bz2lib/Y2K_INFO b/winsup/bz2lib/Y2K_INFO deleted file mode 100644 index 55fd56a..0000000 --- a/winsup/bz2lib/Y2K_INFO +++ /dev/null @@ -1,34 +0,0 @@ - -Y2K status of bzip2 and libbzip2, versions 0.1, 0.9.0 and 0.9.5 -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -Informally speaking: - bzip2 is a compression program built on top of libbzip2, - a library which does the real work of compression and - decompression. As far as I am aware, libbzip2 does not have - any date-related code at all. - - bzip2 itself copies dates from source to destination files - when compressing or decompressing, using the 'stat' and 'utime' - UNIX system calls. It doesn't examine, manipulate or store the - dates in any way. So as far as I can see, there shouldn't be any - problem with bzip2 providing 'stat' and 'utime' work correctly - on your system. - - On non-unix platforms (those for which BZ_UNIX in bzip2.c is - not set to 1), bzip2 doesn't even do the date copying. - - Overall, informally speaking, I don't think bzip2 or libbzip2 - have a Y2K problem. - -Formally speaking: - I am not prepared to offer you any assurance whatsoever - regarding Y2K issues in my software. You alone assume the - entire risk of using the software. The disclaimer of liability - in the LICENSE file in the bzip2 source distribution continues - to apply on this issue as with every other issue pertaining - to the software. - -Julian Seward -Cambridge, UK -25 August 1999 diff --git a/winsup/bz2lib/aclocal.m4 b/winsup/bz2lib/aclocal.m4 deleted file mode 100644 index f5379a5..0000000 --- a/winsup/bz2lib/aclocal.m4 +++ /dev/null @@ -1,137 +0,0 @@ -dnl aclocal.m4 generated automatically by aclocal 1.4 - -dnl Copyright (C) 1994, 1995-8, 1999 Free Software Foundation, Inc. -dnl This file is free software; the Free Software Foundation -dnl gives unlimited permission to copy and/or distribute it, -dnl with or without modifications, as long as this notice is preserved. - -dnl This program is distributed in the hope that it will be useful, -dnl but WITHOUT ANY WARRANTY, to the extent permitted by law; without -dnl even the implied warranty of MERCHANTABILITY or FITNESS FOR A -dnl PARTICULAR PURPOSE. - -# Do all the work for Automake. This macro actually does too much -- -# some checks are only needed if your package does certain things. -# But this isn't really a big deal. - -# serial 1 - -dnl Usage: -dnl AM_INIT_AUTOMAKE(package,version, [no-define]) - -AC_DEFUN(AM_INIT_AUTOMAKE, -[AC_REQUIRE([AC_PROG_INSTALL]) -PACKAGE=[$1] -AC_SUBST(PACKAGE) -VERSION=[$2] -AC_SUBST(VERSION) -dnl test to see if srcdir already configured -if test "`cd $srcdir && pwd`" != "`pwd`" && test -f $srcdir/config.status; then - AC_MSG_ERROR([source directory already configured; run "make distclean" there first]) -fi -ifelse([$3],, -AC_DEFINE_UNQUOTED(PACKAGE, "$PACKAGE", [Name of package]) -AC_DEFINE_UNQUOTED(VERSION, "$VERSION", [Version number of package])) -AC_REQUIRE([AM_SANITY_CHECK]) -AC_REQUIRE([AC_ARG_PROGRAM]) -dnl FIXME This is truly gross. -missing_dir=`cd $ac_aux_dir && pwd` -AM_MISSING_PROG(ACLOCAL, aclocal, $missing_dir) -AM_MISSING_PROG(AUTOCONF, autoconf, $missing_dir) -AM_MISSING_PROG(AUTOMAKE, automake, $missing_dir) -AM_MISSING_PROG(AUTOHEADER, autoheader, $missing_dir) -AM_MISSING_PROG(MAKEINFO, makeinfo, $missing_dir) -AC_REQUIRE([AC_PROG_MAKE_SET])]) - -# -# Check to make sure that the build environment is sane. -# - -AC_DEFUN(AM_SANITY_CHECK, -[AC_MSG_CHECKING([whether build environment is sane]) -# Just in case -sleep 1 -echo timestamp > conftestfile -# Do `set' in a subshell so we don't clobber the current shell's -# arguments. Must try -L first in case configure is actually a -# symlink; some systems play weird games with the mod time of symlinks -# (eg FreeBSD returns the mod time of the symlink's containing -# directory). -if ( - set X `ls -Lt $srcdir/configure conftestfile 2> /dev/null` - if test "[$]*" = "X"; then - # -L didn't work. - set X `ls -t $srcdir/configure conftestfile` - fi - if test "[$]*" != "X $srcdir/configure conftestfile" \ - && test "[$]*" != "X conftestfile $srcdir/configure"; then - - # If neither matched, then we have a broken ls. This can happen - # if, for instance, CONFIG_SHELL is bash and it inherits a - # broken ls alias from the environment. This has actually - # happened. Such a system could not be considered "sane". - AC_MSG_ERROR([ls -t appears to fail. Make sure there is not a broken -alias in your environment]) - fi - - test "[$]2" = conftestfile - ) -then - # Ok. - : -else - AC_MSG_ERROR([newly created file is older than distributed files! -Check your system clock]) -fi -rm -f conftest* -AC_MSG_RESULT(yes)]) - -dnl AM_MISSING_PROG(NAME, PROGRAM, DIRECTORY) -dnl The program must properly implement --version. -AC_DEFUN(AM_MISSING_PROG, -[AC_MSG_CHECKING(for working $2) -# Run test in a subshell; some versions of sh will print an error if -# an executable is not found, even if stderr is redirected. -# Redirect stdin to placate older versions of autoconf. Sigh. -if ($2 --version) < /dev/null > /dev/null 2>&1; then - $1=$2 - AC_MSG_RESULT(found) -else - $1="$3/missing $2" - AC_MSG_RESULT(missing) -fi -AC_SUBST($1)]) - -# Add --enable-maintainer-mode option to configure. -# From Jim Meyering - -# serial 1 - -AC_DEFUN(AM_MAINTAINER_MODE, -[AC_MSG_CHECKING([whether to enable maintainer-specific portions of Makefiles]) - dnl maintainer-mode is disabled by default - AC_ARG_ENABLE(maintainer-mode, -[ --enable-maintainer-mode enable make rules and dependencies not useful - (and sometimes confusing) to the casual installer], - USE_MAINTAINER_MODE=$enableval, - USE_MAINTAINER_MODE=no) - AC_MSG_RESULT($USE_MAINTAINER_MODE) - AM_CONDITIONAL(MAINTAINER_MODE, test $USE_MAINTAINER_MODE = yes) - MAINT=$MAINTAINER_MODE_TRUE - AC_SUBST(MAINT)dnl -] -) - -# Define a conditional. - -AC_DEFUN(AM_CONDITIONAL, -[AC_SUBST($1_TRUE) -AC_SUBST($1_FALSE) -if $2; then - $1_TRUE= - $1_FALSE='#' -else - $1_TRUE='#' - $1_FALSE= -fi]) - diff --git a/winsup/bz2lib/blocksort.c b/winsup/bz2lib/blocksort.c deleted file mode 100644 index ec42672..0000000 --- a/winsup/bz2lib/blocksort.c +++ /dev/null @@ -1,1134 +0,0 @@ - -/*-------------------------------------------------------------*/ -/*--- Block sorting machinery ---*/ -/*--- blocksort.c ---*/ -/*-------------------------------------------------------------*/ - -/*-- - This file is a part of bzip2 and/or libbzip2, a program and - library for lossless, block-sorting data compression. - - Copyright (C) 1996-2000 Julian R Seward. All rights reserved. - - Redistribution and use in source and binary forms, with or without - modification, are permitted provided that the following conditions - are met: - - 1. Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - - 2. The origin of this software must not be misrepresented; you must - not claim that you wrote the original software. If you use this - software in a product, an acknowledgment in the product - documentation would be appreciated but is not required. - - 3. Altered source versions must be plainly marked as such, and must - not be misrepresented as being the original software. - - 4. The name of the author may not be used to endorse or promote - products derived from this software without specific prior written - permission. - - THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS - OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED - WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY - DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE - GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS - INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, - WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING - NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS - SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - - Julian Seward, Cambridge, UK. - jseward@acm.org - bzip2/libbzip2 version 1.0 of 21 March 2000 - - This program is based on (at least) the work of: - Mike Burrows - David Wheeler - Peter Fenwick - Alistair Moffat - Radford Neal - Ian H. Witten - Robert Sedgewick - Jon L. Bentley - - For more information on these sources, see the manual. - - To get some idea how the block sorting algorithms in this file - work, read my paper - On the Performance of BWT Sorting Algorithms - in Proceedings of the IEEE Data Compression Conference 2000, - Snowbird, Utah, USA, 27-30 March 2000. The main sort in this - file implements the algorithm called cache in the paper. ---*/ - - -#include "bzlib_private.h" - -/*---------------------------------------------*/ -/*--- Fallback O(N log(N)^2) sorting ---*/ -/*--- algorithm, for repetitive blocks ---*/ -/*---------------------------------------------*/ - -/*---------------------------------------------*/ -static -__inline__ -void fallbackSimpleSort ( UInt32* fmap, - UInt32* eclass, - Int32 lo, - Int32 hi ) -{ - Int32 i, j, tmp; - UInt32 ec_tmp; - - if (lo == hi) return; - - if (hi - lo > 3) { - for ( i = hi-4; i >= lo; i-- ) { - tmp = fmap[i]; - ec_tmp = eclass[tmp]; - for ( j = i+4; j <= hi && ec_tmp > eclass[fmap[j]]; j += 4 ) - fmap[j-4] = fmap[j]; - fmap[j-4] = tmp; - } - } - - for ( i = hi-1; i >= lo; i-- ) { - tmp = fmap[i]; - ec_tmp = eclass[tmp]; - for ( j = i+1; j <= hi && ec_tmp > eclass[fmap[j]]; j++ ) - fmap[j-1] = fmap[j]; - fmap[j-1] = tmp; - } -} - - -/*---------------------------------------------*/ -#define fswap(zz1, zz2) \ - { Int32 zztmp = zz1; zz1 = zz2; zz2 = zztmp; } - -#define fvswap(zzp1, zzp2, zzn) \ -{ \ - Int32 yyp1 = (zzp1); \ - Int32 yyp2 = (zzp2); \ - Int32 yyn = (zzn); \ - while (yyn > 0) { \ - fswap(fmap[yyp1], fmap[yyp2]); \ - yyp1++; yyp2++; yyn--; \ - } \ -} - - -#define fmin(a,b) ((a) < (b)) ? (a) : (b) - -#define fpush(lz,hz) { stackLo[sp] = lz; \ - stackHi[sp] = hz; \ - sp++; } - -#define fpop(lz,hz) { sp--; \ - lz = stackLo[sp]; \ - hz = stackHi[sp]; } - -#define FALLBACK_QSORT_SMALL_THRESH 10 -#define FALLBACK_QSORT_STACK_SIZE 100 - - -static -void fallbackQSort3 ( UInt32* fmap, - UInt32* eclass, - Int32 loSt, - Int32 hiSt ) -{ - Int32 unLo, unHi, ltLo, gtHi, n, m; - Int32 sp, lo, hi; - UInt32 med, r, r3; - Int32 stackLo[FALLBACK_QSORT_STACK_SIZE]; - Int32 stackHi[FALLBACK_QSORT_STACK_SIZE]; - - r = 0; - - sp = 0; - fpush ( loSt, hiSt ); - - while (sp > 0) { - - AssertH ( sp < FALLBACK_QSORT_STACK_SIZE, 1004 ); - - fpop ( lo, hi ); - if (hi - lo < FALLBACK_QSORT_SMALL_THRESH) { - fallbackSimpleSort ( fmap, eclass, lo, hi ); - continue; - } - - /* Random partitioning. Median of 3 sometimes fails to - avoid bad cases. Median of 9 seems to help but - looks rather expensive. This too seems to work but - is cheaper. Guidance for the magic constants - 7621 and 32768 is taken from Sedgewick's algorithms - book, chapter 35. - */ - r = ((r * 7621) + 1) % 32768; - r3 = r % 3; - if (r3 == 0) med = eclass[fmap[lo]]; else - if (r3 == 1) med = eclass[fmap[(lo+hi)>>1]]; else - med = eclass[fmap[hi]]; - - unLo = ltLo = lo; - unHi = gtHi = hi; - - while (1) { - while (1) { - if (unLo > unHi) break; - n = (Int32)eclass[fmap[unLo]] - (Int32)med; - if (n == 0) { - fswap(fmap[unLo], fmap[ltLo]); - ltLo++; unLo++; - continue; - }; - if (n > 0) break; - unLo++; - } - while (1) { - if (unLo > unHi) break; - n = (Int32)eclass[fmap[unHi]] - (Int32)med; - if (n == 0) { - fswap(fmap[unHi], fmap[gtHi]); - gtHi--; unHi--; - continue; - }; - if (n < 0) break; - unHi--; - } - if (unLo > unHi) break; - fswap(fmap[unLo], fmap[unHi]); unLo++; unHi--; - } - - AssertD ( unHi == unLo-1, "fallbackQSort3(2)" ); - - if (gtHi < ltLo) continue; - - n = fmin(ltLo-lo, unLo-ltLo); fvswap(lo, unLo-n, n); - m = fmin(hi-gtHi, gtHi-unHi); fvswap(unLo, hi-m+1, m); - - n = lo + unLo - ltLo - 1; - m = hi - (gtHi - unHi) + 1; - - if (n - lo > hi - m) { - fpush ( lo, n ); - fpush ( m, hi ); - } else { - fpush ( m, hi ); - fpush ( lo, n ); - } - } -} - -#undef fmin -#undef fpush -#undef fpop -#undef fswap -#undef fvswap -#undef FALLBACK_QSORT_SMALL_THRESH -#undef FALLBACK_QSORT_STACK_SIZE - - -/*---------------------------------------------*/ -/* Pre: - nblock > 0 - eclass exists for [0 .. nblock-1] - ((UChar*)eclass) [0 .. nblock-1] holds block - ptr exists for [0 .. nblock-1] - - Post: - ((UChar*)eclass) [0 .. nblock-1] holds block - All other areas of eclass destroyed - fmap [0 .. nblock-1] holds sorted order - bhtab [ 0 .. 2+(nblock/32) ] destroyed -*/ - -#define SET_BH(zz) bhtab[(zz) >> 5] |= (1 << ((zz) & 31)) -#define CLEAR_BH(zz) bhtab[(zz) >> 5] &= ~(1 << ((zz) & 31)) -#define ISSET_BH(zz) (bhtab[(zz) >> 5] & (1 << ((zz) & 31))) -#define WORD_BH(zz) bhtab[(zz) >> 5] -#define UNALIGNED_BH(zz) ((zz) & 0x01f) - -static -void fallbackSort ( UInt32* fmap, - UInt32* eclass, - UInt32* bhtab, - Int32 nblock, - Int32 verb ) -{ - Int32 ftab[257]; - Int32 ftabCopy[256]; - Int32 H, i, j, k, l, r, cc, cc1; - Int32 nNotDone; - Int32 nBhtab; - UChar* eclass8 = (UChar*)eclass; - - /*-- - Initial 1-char radix sort to generate - initial fmap and initial BH bits. - --*/ - if (verb >= 4) - VPrintf0 ( " bucket sorting ...\n" ); - for (i = 0; i < 257; i++) ftab[i] = 0; - for (i = 0; i < nblock; i++) ftab[eclass8[i]]++; - for (i = 0; i < 256; i++) ftabCopy[i] = ftab[i]; - for (i = 1; i < 257; i++) ftab[i] += ftab[i-1]; - - for (i = 0; i < nblock; i++) { - j = eclass8[i]; - k = ftab[j] - 1; - ftab[j] = k; - fmap[k] = i; - } - - nBhtab = 2 + (nblock / 32); - for (i = 0; i < nBhtab; i++) bhtab[i] = 0; - for (i = 0; i < 256; i++) SET_BH(ftab[i]); - - /*-- - Inductively refine the buckets. Kind-of an - "exponential radix sort" (!), inspired by the - Manber-Myers suffix array construction algorithm. - --*/ - - /*-- set sentinel bits for block-end detection --*/ - for (i = 0; i < 32; i++) { - SET_BH(nblock + 2*i); - CLEAR_BH(nblock + 2*i + 1); - } - - /*-- the log(N) loop --*/ - H = 1; - while (1) { - - if (verb >= 4) - VPrintf1 ( " depth %6d has ", H ); - - j = 0; - for (i = 0; i < nblock; i++) { - if (ISSET_BH(i)) j = i; - k = fmap[i] - H; if (k < 0) k += nblock; - eclass[k] = j; - } - - nNotDone = 0; - r = -1; - while (1) { - - /*-- find the next non-singleton bucket --*/ - k = r + 1; - while (ISSET_BH(k) && UNALIGNED_BH(k)) k++; - if (ISSET_BH(k)) { - while (WORD_BH(k) == 0xffffffff) k += 32; - while (ISSET_BH(k)) k++; - } - l = k - 1; - if (l >= nblock) break; - while (!ISSET_BH(k) && UNALIGNED_BH(k)) k++; - if (!ISSET_BH(k)) { - while (WORD_BH(k) == 0x00000000) k += 32; - while (!ISSET_BH(k)) k++; - } - r = k - 1; - if (r >= nblock) break; - - /*-- now [l, r] bracket current bucket --*/ - if (r > l) { - nNotDone += (r - l + 1); - fallbackQSort3 ( fmap, eclass, l, r ); - - /*-- scan bucket and generate header bits-- */ - cc = -1; - for (i = l; i <= r; i++) { - cc1 = eclass[fmap[i]]; - if (cc != cc1) { SET_BH(i); cc = cc1; }; - } - } - } - - if (verb >= 4) - VPrintf1 ( "%6d unresolved strings\n", nNotDone ); - - H *= 2; - if (H > nblock || nNotDone == 0) break; - } - - /*-- - Reconstruct the original block in - eclass8 [0 .. nblock-1], since the - previous phase destroyed it. - --*/ - if (verb >= 4) - VPrintf0 ( " reconstructing block ...\n" ); - j = 0; - for (i = 0; i < nblock; i++) { - while (ftabCopy[j] == 0) j++; - ftabCopy[j]--; - eclass8[fmap[i]] = (UChar)j; - } - AssertH ( j < 256, 1005 ); -} - -#undef SET_BH -#undef CLEAR_BH -#undef ISSET_BH -#undef WORD_BH -#undef UNALIGNED_BH - - -/*---------------------------------------------*/ -/*--- The main, O(N^2 log(N)) sorting ---*/ -/*--- algorithm. Faster for "normal" ---*/ -/*--- non-repetitive blocks. ---*/ -/*---------------------------------------------*/ - -/*---------------------------------------------*/ -static -__inline__ -Bool mainGtU ( UInt32 i1, - UInt32 i2, - UChar* block, - UInt16* quadrant, - UInt32 nblock, - Int32* budget ) -{ - Int32 k; - UChar c1, c2; - UInt16 s1, s2; - - AssertD ( i1 != i2, "mainGtU" ); - /* 1 */ - c1 = block[i1]; c2 = block[i2]; - if (c1 != c2) return (c1 > c2); - i1++; i2++; - /* 2 */ - c1 = block[i1]; c2 = block[i2]; - if (c1 != c2) return (c1 > c2); - i1++; i2++; - /* 3 */ - c1 = block[i1]; c2 = block[i2]; - if (c1 != c2) return (c1 > c2); - i1++; i2++; - /* 4 */ - c1 = block[i1]; c2 = block[i2]; - if (c1 != c2) return (c1 > c2); - i1++; i2++; - /* 5 */ - c1 = block[i1]; c2 = block[i2]; - if (c1 != c2) return (c1 > c2); - i1++; i2++; - /* 6 */ - c1 = block[i1]; c2 = block[i2]; - if (c1 != c2) return (c1 > c2); - i1++; i2++; - /* 7 */ - c1 = block[i1]; c2 = block[i2]; - if (c1 != c2) return (c1 > c2); - i1++; i2++; - /* 8 */ - c1 = block[i1]; c2 = block[i2]; - if (c1 != c2) return (c1 > c2); - i1++; i2++; - /* 9 */ - c1 = block[i1]; c2 = block[i2]; - if (c1 != c2) return (c1 > c2); - i1++; i2++; - /* 10 */ - c1 = block[i1]; c2 = block[i2]; - if (c1 != c2) return (c1 > c2); - i1++; i2++; - /* 11 */ - c1 = block[i1]; c2 = block[i2]; - if (c1 != c2) return (c1 > c2); - i1++; i2++; - /* 12 */ - c1 = block[i1]; c2 = block[i2]; - if (c1 != c2) return (c1 > c2); - i1++; i2++; - - k = nblock + 8; - - do { - /* 1 */ - c1 = block[i1]; c2 = block[i2]; - if (c1 != c2) return (c1 > c2); - s1 = quadrant[i1]; s2 = quadrant[i2]; - if (s1 != s2) return (s1 > s2); - i1++; i2++; - /* 2 */ - c1 = block[i1]; c2 = block[i2]; - if (c1 != c2) return (c1 > c2); - s1 = quadrant[i1]; s2 = quadrant[i2]; - if (s1 != s2) return (s1 > s2); - i1++; i2++; - /* 3 */ - c1 = block[i1]; c2 = block[i2]; - if (c1 != c2) return (c1 > c2); - s1 = quadrant[i1]; s2 = quadrant[i2]; - if (s1 != s2) return (s1 > s2); - i1++; i2++; - /* 4 */ - c1 = block[i1]; c2 = block[i2]; - if (c1 != c2) return (c1 > c2); - s1 = quadrant[i1]; s2 = quadrant[i2]; - if (s1 != s2) return (s1 > s2); - i1++; i2++; - /* 5 */ - c1 = block[i1]; c2 = block[i2]; - if (c1 != c2) return (c1 > c2); - s1 = quadrant[i1]; s2 = quadrant[i2]; - if (s1 != s2) return (s1 > s2); - i1++; i2++; - /* 6 */ - c1 = block[i1]; c2 = block[i2]; - if (c1 != c2) return (c1 > c2); - s1 = quadrant[i1]; s2 = quadrant[i2]; - if (s1 != s2) return (s1 > s2); - i1++; i2++; - /* 7 */ - c1 = block[i1]; c2 = block[i2]; - if (c1 != c2) return (c1 > c2); - s1 = quadrant[i1]; s2 = quadrant[i2]; - if (s1 != s2) return (s1 > s2); - i1++; i2++; - /* 8 */ - c1 = block[i1]; c2 = block[i2]; - if (c1 != c2) return (c1 > c2); - s1 = quadrant[i1]; s2 = quadrant[i2]; - if (s1 != s2) return (s1 > s2); - i1++; i2++; - - if (i1 >= nblock) i1 -= nblock; - if (i2 >= nblock) i2 -= nblock; - - k -= 8; - (*budget)--; - } - while (k >= 0); - - return False; -} - - -/*---------------------------------------------*/ -/*-- - Knuth's increments seem to work better - than Incerpi-Sedgewick here. Possibly - because the number of elems to sort is - usually small, typically <= 20. ---*/ -static -Int32 incs[14] = { 1, 4, 13, 40, 121, 364, 1093, 3280, - 9841, 29524, 88573, 265720, - 797161, 2391484 }; - -static -void mainSimpleSort ( UInt32* ptr, - UChar* block, - UInt16* quadrant, - Int32 nblock, - Int32 lo, - Int32 hi, - Int32 d, - Int32* budget ) -{ - Int32 i, j, h, bigN, hp; - UInt32 v; - - bigN = hi - lo + 1; - if (bigN < 2) return; - - hp = 0; - while (incs[hp] < bigN) hp++; - hp--; - - for (; hp >= 0; hp--) { - h = incs[hp]; - - i = lo + h; - while (True) { - - /*-- copy 1 --*/ - if (i > hi) break; - v = ptr[i]; - j = i; - while ( mainGtU ( - ptr[j-h]+d, v+d, block, quadrant, nblock, budget - ) ) { - ptr[j] = ptr[j-h]; - j = j - h; - if (j <= (lo + h - 1)) break; - } - ptr[j] = v; - i++; - - /*-- copy 2 --*/ - if (i > hi) break; - v = ptr[i]; - j = i; - while ( mainGtU ( - ptr[j-h]+d, v+d, block, quadrant, nblock, budget - ) ) { - ptr[j] = ptr[j-h]; - j = j - h; - if (j <= (lo + h - 1)) break; - } - ptr[j] = v; - i++; - - /*-- copy 3 --*/ - if (i > hi) break; - v = ptr[i]; - j = i; - while ( mainGtU ( - ptr[j-h]+d, v+d, block, quadrant, nblock, budget - ) ) { - ptr[j] = ptr[j-h]; - j = j - h; - if (j <= (lo + h - 1)) break; - } - ptr[j] = v; - i++; - - if (*budget < 0) return; - } - } -} - - -/*---------------------------------------------*/ -/*-- - The following is an implementation of - an elegant 3-way quicksort for strings, - described in a paper "Fast Algorithms for - Sorting and Searching Strings", by Robert - Sedgewick and Jon L. Bentley. ---*/ - -#define mswap(zz1, zz2) \ - { Int32 zztmp = zz1; zz1 = zz2; zz2 = zztmp; } - -#define mvswap(zzp1, zzp2, zzn) \ -{ \ - Int32 yyp1 = (zzp1); \ - Int32 yyp2 = (zzp2); \ - Int32 yyn = (zzn); \ - while (yyn > 0) { \ - mswap(ptr[yyp1], ptr[yyp2]); \ - yyp1++; yyp2++; yyn--; \ - } \ -} - -static -__inline__ -UChar mmed3 ( UChar a, UChar b, UChar c ) -{ - UChar t; - if (a > b) { t = a; a = b; b = t; }; - if (b > c) { - b = c; - if (a > b) b = a; - } - return b; -} - -#define mmin(a,b) ((a) < (b)) ? (a) : (b) - -#define mpush(lz,hz,dz) { stackLo[sp] = lz; \ - stackHi[sp] = hz; \ - stackD [sp] = dz; \ - sp++; } - -#define mpop(lz,hz,dz) { sp--; \ - lz = stackLo[sp]; \ - hz = stackHi[sp]; \ - dz = stackD [sp]; } - - -#define mnextsize(az) (nextHi[az]-nextLo[az]) - -#define mnextswap(az,bz) \ - { Int32 tz; \ - tz = nextLo[az]; nextLo[az] = nextLo[bz]; nextLo[bz] = tz; \ - tz = nextHi[az]; nextHi[az] = nextHi[bz]; nextHi[bz] = tz; \ - tz = nextD [az]; nextD [az] = nextD [bz]; nextD [bz] = tz; } - - -#define MAIN_QSORT_SMALL_THRESH 20 -#define MAIN_QSORT_DEPTH_THRESH (BZ_N_RADIX + BZ_N_QSORT) -#define MAIN_QSORT_STACK_SIZE 100 - -static -void mainQSort3 ( UInt32* ptr, - UChar* block, - UInt16* quadrant, - Int32 nblock, - Int32 loSt, - Int32 hiSt, - Int32 dSt, - Int32* budget ) -{ - Int32 unLo, unHi, ltLo, gtHi, n, m, med; - Int32 sp, lo, hi, d; - - Int32 stackLo[MAIN_QSORT_STACK_SIZE]; - Int32 stackHi[MAIN_QSORT_STACK_SIZE]; - Int32 stackD [MAIN_QSORT_STACK_SIZE]; - - Int32 nextLo[3]; - Int32 nextHi[3]; - Int32 nextD [3]; - - sp = 0; - mpush ( loSt, hiSt, dSt ); - - while (sp > 0) { - - AssertH ( sp < MAIN_QSORT_STACK_SIZE, 1001 ); - - mpop ( lo, hi, d ); - if (hi - lo < MAIN_QSORT_SMALL_THRESH || - d > MAIN_QSORT_DEPTH_THRESH) { - mainSimpleSort ( ptr, block, quadrant, nblock, lo, hi, d, budget ); - if (*budget < 0) return; - continue; - } - - med = (Int32) - mmed3 ( block[ptr[ lo ]+d], - block[ptr[ hi ]+d], - block[ptr[ (lo+hi)>>1 ]+d] ); - - unLo = ltLo = lo; - unHi = gtHi = hi; - - while (True) { - while (True) { - if (unLo > unHi) break; - n = ((Int32)block[ptr[unLo]+d]) - med; - if (n == 0) { - mswap(ptr[unLo], ptr[ltLo]); - ltLo++; unLo++; continue; - }; - if (n > 0) break; - unLo++; - } - while (True) { - if (unLo > unHi) break; - n = ((Int32)block[ptr[unHi]+d]) - med; - if (n == 0) { - mswap(ptr[unHi], ptr[gtHi]); - gtHi--; unHi--; continue; - }; - if (n < 0) break; - unHi--; - } - if (unLo > unHi) break; - mswap(ptr[unLo], ptr[unHi]); unLo++; unHi--; - } - - AssertD ( unHi == unLo-1, "mainQSort3(2)" ); - - if (gtHi < ltLo) { - mpush(lo, hi, d+1 ); - continue; - } - - n = mmin(ltLo-lo, unLo-ltLo); mvswap(lo, unLo-n, n); - m = mmin(hi-gtHi, gtHi-unHi); mvswap(unLo, hi-m+1, m); - - n = lo + unLo - ltLo - 1; - m = hi - (gtHi - unHi) + 1; - - nextLo[0] = lo; nextHi[0] = n; nextD[0] = d; - nextLo[1] = m; nextHi[1] = hi; nextD[1] = d; - nextLo[2] = n+1; nextHi[2] = m-1; nextD[2] = d+1; - - if (mnextsize(0) < mnextsize(1)) mnextswap(0,1); - if (mnextsize(1) < mnextsize(2)) mnextswap(1,2); - if (mnextsize(0) < mnextsize(1)) mnextswap(0,1); - - AssertD (mnextsize(0) >= mnextsize(1), "mainQSort3(8)" ); - AssertD (mnextsize(1) >= mnextsize(2), "mainQSort3(9)" ); - - mpush (nextLo[0], nextHi[0], nextD[0]); - mpush (nextLo[1], nextHi[1], nextD[1]); - mpush (nextLo[2], nextHi[2], nextD[2]); - } -} - -#undef mswap -#undef mvswap -#undef mpush -#undef mpop -#undef mmin -#undef mnextsize -#undef mnextswap -#undef MAIN_QSORT_SMALL_THRESH -#undef MAIN_QSORT_DEPTH_THRESH -#undef MAIN_QSORT_STACK_SIZE - - -/*---------------------------------------------*/ -/* Pre: - nblock > N_OVERSHOOT - block32 exists for [0 .. nblock-1 +N_OVERSHOOT] - ((UChar*)block32) [0 .. nblock-1] holds block - ptr exists for [0 .. nblock-1] - - Post: - ((UChar*)block32) [0 .. nblock-1] holds block - All other areas of block32 destroyed - ftab [0 .. 65536 ] destroyed - ptr [0 .. nblock-1] holds sorted order - if (*budget < 0), sorting was abandoned -*/ - -#define BIGFREQ(b) (ftab[((b)+1) << 8] - ftab[(b) << 8]) -#define SETMASK (1 << 21) -#define CLEARMASK (~(SETMASK)) - -static -void mainSort ( UInt32* ptr, - UChar* block, - UInt16* quadrant, - UInt32* ftab, - Int32 nblock, - Int32 verb, - Int32* budget ) -{ - Int32 i, j, k, ss, sb; - Int32 runningOrder[256]; - Bool bigDone[256]; - Int32 copyStart[256]; - Int32 copyEnd [256]; - UChar c1; - Int32 numQSorted; - UInt16 s; - if (verb >= 4) VPrintf0 ( " main sort initialise ...\n" ); - - /*-- set up the 2-byte frequency table --*/ - for (i = 65536; i >= 0; i--) ftab[i] = 0; - - j = block[0] << 8; - i = nblock-1; - for (; i >= 3; i -= 4) { - quadrant[i] = 0; - j = (j >> 8) | ( ((UInt16)block[i]) << 8); - ftab[j]++; - quadrant[i-1] = 0; - j = (j >> 8) | ( ((UInt16)block[i-1]) << 8); - ftab[j]++; - quadrant[i-2] = 0; - j = (j >> 8) | ( ((UInt16)block[i-2]) << 8); - ftab[j]++; - quadrant[i-3] = 0; - j = (j >> 8) | ( ((UInt16)block[i-3]) << 8); - ftab[j]++; - } - for (; i >= 0; i--) { - quadrant[i] = 0; - j = (j >> 8) | ( ((UInt16)block[i]) << 8); - ftab[j]++; - } - - /*-- (emphasises close relationship of block & quadrant) --*/ - for (i = 0; i < BZ_N_OVERSHOOT; i++) { - block [nblock+i] = block[i]; - quadrant[nblock+i] = 0; - } - - if (verb >= 4) VPrintf0 ( " bucket sorting ...\n" ); - - /*-- Complete the initial radix sort --*/ - for (i = 1; i <= 65536; i++) ftab[i] += ftab[i-1]; - - s = block[0] << 8; - i = nblock-1; - for (; i >= 3; i -= 4) { - s = (s >> 8) | (block[i] << 8); - j = ftab[s] -1; - ftab[s] = j; - ptr[j] = i; - s = (s >> 8) | (block[i-1] << 8); - j = ftab[s] -1; - ftab[s] = j; - ptr[j] = i-1; - s = (s >> 8) | (block[i-2] << 8); - j = ftab[s] -1; - ftab[s] = j; - ptr[j] = i-2; - s = (s >> 8) | (block[i-3] << 8); - j = ftab[s] -1; - ftab[s] = j; - ptr[j] = i-3; - } - for (; i >= 0; i--) { - s = (s >> 8) | (block[i] << 8); - j = ftab[s] -1; - ftab[s] = j; - ptr[j] = i; - } - - /*-- - Now ftab contains the first loc of every small bucket. - Calculate the running order, from smallest to largest - big bucket. - --*/ - for (i = 0; i <= 255; i++) { - bigDone [i] = False; - runningOrder[i] = i; - } - - { - Int32 vv; - Int32 h = 1; - do h = 3 * h + 1; while (h <= 256); - do { - h = h / 3; - for (i = h; i <= 255; i++) { - vv = runningOrder[i]; - j = i; - while ( BIGFREQ(runningOrder[j-h]) > BIGFREQ(vv) ) { - runningOrder[j] = runningOrder[j-h]; - j = j - h; - if (j <= (h - 1)) goto zero; - } - zero: - runningOrder[j] = vv; - } - } while (h != 1); - } - - /*-- - The main sorting loop. - --*/ - - numQSorted = 0; - - for (i = 0; i <= 255; i++) { - - /*-- - Process big buckets, starting with the least full. - Basically this is a 3-step process in which we call - mainQSort3 to sort the small buckets [ss, j], but - also make a big effort to avoid the calls if we can. - --*/ - ss = runningOrder[i]; - - /*-- - Step 1: - Complete the big bucket [ss] by quicksorting - any unsorted small buckets [ss, j], for j != ss. - Hopefully previous pointer-scanning phases have already - completed many of the small buckets [ss, j], so - we don't have to sort them at all. - --*/ - for (j = 0; j <= 255; j++) { - if (j != ss) { - sb = (ss << 8) + j; - if ( ! (ftab[sb] & SETMASK) ) { - Int32 lo = ftab[sb] & CLEARMASK; - Int32 hi = (ftab[sb+1] & CLEARMASK) - 1; - if (hi > lo) { - if (verb >= 4) - VPrintf4 ( " qsort [0x%x, 0x%x] " - "done %d this %d\n", - ss, j, numQSorted, hi - lo + 1 ); - mainQSort3 ( - ptr, block, quadrant, nblock, - lo, hi, BZ_N_RADIX, budget - ); - numQSorted += (hi - lo + 1); - if (*budget < 0) return; - } - } - ftab[sb] |= SETMASK; - } - } - - AssertH ( !bigDone[ss], 1006 ); - - /*-- - Step 2: - Now scan this big bucket [ss] so as to synthesise the - sorted order for small buckets [t, ss] for all t, - including, magically, the bucket [ss,ss] too. - This will avoid doing Real Work in subsequent Step 1's. - --*/ - { - for (j = 0; j <= 255; j++) { - copyStart[j] = ftab[(j << 8) + ss] & CLEARMASK; - copyEnd [j] = (ftab[(j << 8) + ss + 1] & CLEARMASK) - 1; - } - for (j = ftab[ss << 8] & CLEARMASK; j < copyStart[ss]; j++) { - k = ptr[j]-1; if (k < 0) k += nblock; - c1 = block[k]; - if (!bigDone[c1]) - ptr[ copyStart[c1]++ ] = k; - } - for (j = (ftab[(ss+1) << 8] & CLEARMASK) - 1; j > copyEnd[ss]; j--) { - k = ptr[j]-1; if (k < 0) k += nblock; - c1 = block[k]; - if (!bigDone[c1]) - ptr[ copyEnd[c1]-- ] = k; - } - } - - AssertH ( copyStart[ss]-1 == copyEnd[ss], 1007 ); - - for (j = 0; j <= 255; j++) ftab[(j << 8) + ss] |= SETMASK; - - /*-- - Step 3: - The [ss] big bucket is now done. Record this fact, - and update the quadrant descriptors. Remember to - update quadrants in the overshoot area too, if - necessary. The "if (i < 255)" test merely skips - this updating for the last bucket processed, since - updating for the last bucket is pointless. - - The quadrant array provides a way to incrementally - cache sort orderings, as they appear, so as to - make subsequent comparisons in fullGtU() complete - faster. For repetitive blocks this makes a big - difference (but not big enough to be able to avoid - the fallback sorting mechanism, exponential radix sort). - - The precise meaning is: at all times: - - for 0 <= i < nblock and 0 <= j <= nblock - - if block[i] != block[j], - - then the relative values of quadrant[i] and - quadrant[j] are meaningless. - - else { - if quadrant[i] < quadrant[j] - then the string starting at i lexicographically - precedes the string starting at j - - else if quadrant[i] > quadrant[j] - then the string starting at j lexicographically - precedes the string starting at i - - else - the relative ordering of the strings starting - at i and j has not yet been determined. - } - --*/ - bigDone[ss] = True; - - if (i < 255) { - Int32 bbStart = ftab[ss << 8] & CLEARMASK; - Int32 bbSize = (ftab[(ss+1) << 8] & CLEARMASK) - bbStart; - Int32 shifts = 0; - - while ((bbSize >> shifts) > 65534) shifts++; - - for (j = bbSize-1; j >= 0; j--) { - Int32 a2update = ptr[bbStart + j]; - UInt16 qVal = (UInt16)(j >> shifts); - quadrant[a2update] = qVal; - if (a2update < BZ_N_OVERSHOOT) - quadrant[a2update + nblock] = qVal; - } - AssertH ( ((bbSize-1) >> shifts) <= 65535, 1002 ); - } - - } - - if (verb >= 4) - VPrintf3 ( " %d pointers, %d sorted, %d scanned\n", - nblock, numQSorted, nblock - numQSorted ); -} - -#undef BIGFREQ -#undef SETMASK -#undef CLEARMASK - - -/*---------------------------------------------*/ -/* Pre: - nblock > 0 - arr2 exists for [0 .. nblock-1 +N_OVERSHOOT] - ((UChar*)arr2) [0 .. nblock-1] holds block - arr1 exists for [0 .. nblock-1] - - Post: - ((UChar*)arr2) [0 .. nblock-1] holds block - All other areas of block destroyed - ftab [ 0 .. 65536 ] destroyed - arr1 [0 .. nblock-1] holds sorted order -*/ -void BZ2_blockSort ( EState* s ) -{ - UInt32* ptr = s->ptr; - UChar* block = s->block; - UInt32* ftab = s->ftab; - Int32 nblock = s->nblock; - Int32 verb = s->verbosity; - Int32 wfact = s->workFactor; - UInt16* quadrant; - Int32 budget; - Int32 budgetInit; - Int32 i; - - if (nblock < 10000) { - fallbackSort ( s->arr1, s->arr2, ftab, nblock, verb ); - } else { - /* Calculate the location for quadrant, remembering to get - the alignment right. Assumes that &(block[0]) is at least - 2-byte aligned -- this should be ok since block is really - the first section of arr2. - */ - i = nblock+BZ_N_OVERSHOOT; - if (i & 1) i++; - quadrant = (UInt16*)(&(block[i])); - - /* (wfact-1) / 3 puts the default-factor-30 - transition point at very roughly the same place as - with v0.1 and v0.9.0. - Not that it particularly matters any more, since the - resulting compressed stream is now the same regardless - of whether or not we use the main sort or fallback sort. - */ - if (wfact < 1 ) wfact = 1; - if (wfact > 100) wfact = 100; - budgetInit = nblock * ((wfact-1) / 3); - budget = budgetInit; - - mainSort ( ptr, block, quadrant, ftab, nblock, verb, &budget ); - if (verb >= 3) - VPrintf3 ( " %d work, %d block, ratio %5.2f\n", - budgetInit - budget, - nblock, - (float)(budgetInit - budget) / - (float)(nblock==0 ? 1 : nblock) ); - if (budget < 0) { - if (verb >= 2) - VPrintf0 ( " too repetitive; using fallback" - " sorting algorithm\n" ); - fallbackSort ( s->arr1, s->arr2, ftab, nblock, verb ); - } - } - - s->origPtr = -1; - for (i = 0; i < s->nblock; i++) - if (ptr[i] == 0) - { s->origPtr = i; break; }; - - AssertH( s->origPtr != -1, 1003 ); -} - - -/*-------------------------------------------------------------*/ -/*--- end blocksort.c ---*/ -/*-------------------------------------------------------------*/ diff --git a/winsup/bz2lib/bzip2.1 b/winsup/bz2lib/bzip2.1 deleted file mode 100644 index 7de54a0..0000000 --- a/winsup/bz2lib/bzip2.1 +++ /dev/null @@ -1,439 +0,0 @@ -.PU -.TH bzip2 1 -.SH NAME -bzip2, bunzip2 \- a block-sorting file compressor, v1.0 -.br -bzcat \- decompresses files to stdout -.br -bzip2recover \- recovers data from damaged bzip2 files - -.SH SYNOPSIS -.ll +8 -.B bzip2 -.RB [ " \-cdfkqstvzVL123456789 " ] -[ -.I "filenames \&..." -] -.ll -8 -.br -.B bunzip2 -.RB [ " \-fkvsVL " ] -[ -.I "filenames \&..." -] -.br -.B bzcat -.RB [ " \-s " ] -[ -.I "filenames \&..." -] -.br -.B bzip2recover -.I "filename" - -.SH DESCRIPTION -.I bzip2 -compresses files using the Burrows-Wheeler block sorting -text compression algorithm, and Huffman coding. Compression is -generally considerably better than that achieved by more conventional -LZ77/LZ78-based compressors, and approaches the performance of the PPM -family of statistical compressors. - -The command-line options are deliberately very similar to -those of -.I GNU gzip, -but they are not identical. - -.I bzip2 -expects a list of file names to accompany the -command-line flags. Each file is replaced by a compressed version of -itself, with the name "original_name.bz2". -Each compressed file -has the same modification date, permissions, and, when possible, -ownership as the corresponding original, so that these properties can -be correctly restored at decompression time. File name handling is -naive in the sense that there is no mechanism for preserving original -file names, permissions, ownerships or dates in filesystems which lack -these concepts, or have serious file name length restrictions, such as -MS-DOS. - -.I bzip2 -and -.I bunzip2 -will by default not overwrite existing -files. If you want this to happen, specify the \-f flag. - -If no file names are specified, -.I bzip2 -compresses from standard -input to standard output. In this case, -.I bzip2 -will decline to -write compressed output to a terminal, as this would be entirely -incomprehensible and therefore pointless. - -.I bunzip2 -(or -.I bzip2 \-d) -decompresses all -specified files. Files which were not created by -.I bzip2 -will be detected and ignored, and a warning issued. -.I bzip2 -attempts to guess the filename for the decompressed file -from that of the compressed file as follows: - - filename.bz2 becomes filename - filename.bz becomes filename - filename.tbz2 becomes filename.tar - filename.tbz becomes filename.tar - anyothername becomes anyothername.out - -If the file does not end in one of the recognised endings, -.I .bz2, -.I .bz, -.I .tbz2 -or -.I .tbz, -.I bzip2 -complains that it cannot -guess the name of the original file, and uses the original name -with -.I .out -appended. - -As with compression, supplying no -filenames causes decompression from -standard input to standard output. - -.I bunzip2 -will correctly decompress a file which is the -concatenation of two or more compressed files. The result is the -concatenation of the corresponding uncompressed files. Integrity -testing (\-t) -of concatenated -compressed files is also supported. - -You can also compress or decompress files to the standard output by -giving the \-c flag. Multiple files may be compressed and -decompressed like this. The resulting outputs are fed sequentially to -stdout. Compression of multiple files -in this manner generates a stream -containing multiple compressed file representations. Such a stream -can be decompressed correctly only by -.I bzip2 -version 0.9.0 or -later. Earlier versions of -.I bzip2 -will stop after decompressing -the first file in the stream. - -.I bzcat -(or -.I bzip2 -dc) -decompresses all specified files to -the standard output. - -.I bzip2 -will read arguments from the environment variables -.I BZIP2 -and -.I BZIP, -in that order, and will process them -before any arguments read from the command line. This gives a -convenient way to supply default arguments. - -Compression is always performed, even if the compressed -file is slightly -larger than the original. Files of less than about one hundred bytes -tend to get larger, since the compression mechanism has a constant -overhead in the region of 50 bytes. Random data (including the output -of most file compressors) is coded at about 8.05 bits per byte, giving -an expansion of around 0.5%. - -As a self-check for your protection, -.I -bzip2 -uses 32-bit CRCs to -make sure that the decompressed version of a file is identical to the -original. This guards against corruption of the compressed data, and -against undetected bugs in -.I bzip2 -(hopefully very unlikely). The -chances of data corruption going undetected is microscopic, about one -chance in four billion for each file processed. Be aware, though, that -the check occurs upon decompression, so it can only tell you that -something is wrong. It can't help you -recover the original uncompressed -data. You can use -.I bzip2recover -to try to recover data from -damaged files. - -Return values: 0 for a normal exit, 1 for environmental problems (file -not found, invalid flags, I/O errors, &c), 2 to indicate a corrupt -compressed file, 3 for an internal consistency error (eg, bug) which -caused -.I bzip2 -to panic. - -.SH OPTIONS -.TP -.B \-c --stdout -Compress or decompress to standard output. -.TP -.B \-d --decompress -Force decompression. -.I bzip2, -.I bunzip2 -and -.I bzcat -are -really the same program, and the decision about what actions to take is -done on the basis of which name is used. This flag overrides that -mechanism, and forces -.I bzip2 -to decompress. -.TP -.B \-z --compress -The complement to \-d: forces compression, regardless of the -invokation name. -.TP -.B \-t --test -Check integrity of the specified file(s), but don't decompress them. -This really performs a trial decompression and throws away the result. -.TP -.B \-f --force -Force overwrite of output files. Normally, -.I bzip2 -will not overwrite -existing output files. Also forces -.I bzip2 -to break hard links -to files, which it otherwise wouldn't do. -.TP -.B \-k --keep -Keep (don't delete) input files during compression -or decompression. -.TP -.B \-s --small -Reduce memory usage, for compression, decompression and testing. Files -are decompressed and tested using a modified algorithm which only -requires 2.5 bytes per block byte. This means any file can be -decompressed in 2300k of memory, albeit at about half the normal speed. - -During compression, \-s selects a block size of 200k, which limits -memory use to around the same figure, at the expense of your compression -ratio. In short, if your machine is low on memory (8 megabytes or -less), use \-s for everything. See MEMORY MANAGEMENT below. -.TP -.B \-q --quiet -Suppress non-essential warning messages. Messages pertaining to -I/O errors and other critical events will not be suppressed. -.TP -.B \-v --verbose -Verbose mode -- show the compression ratio for each file processed. -Further \-v's increase the verbosity level, spewing out lots of -information which is primarily of interest for diagnostic purposes. -.TP -.B \-L --license -V --version -Display the software version, license terms and conditions. -.TP -.B \-1 to \-9 -Set the block size to 100 k, 200 k .. 900 k when compressing. Has no -effect when decompressing. See MEMORY MANAGEMENT below. -.TP -.B \-- -Treats all subsequent arguments as file names, even if they start -with a dash. This is so you can handle files with names beginning -with a dash, for example: bzip2 \-- \-myfilename. -.TP -.B \--repetitive-fast --repetitive-best -These flags are redundant in versions 0.9.5 and above. They provided -some coarse control over the behaviour of the sorting algorithm in -earlier versions, which was sometimes useful. 0.9.5 and above have an -improved algorithm which renders these flags irrelevant. - -.SH MEMORY MANAGEMENT -.I bzip2 -compresses large files in blocks. The block size affects -both the compression ratio achieved, and the amount of memory needed for -compression and decompression. The flags \-1 through \-9 -specify the block size to be 100,000 bytes through 900,000 bytes (the -default) respectively. At decompression time, the block size used for -compression is read from the header of the compressed file, and -.I bunzip2 -then allocates itself just enough memory to decompress -the file. Since block sizes are stored in compressed files, it follows -that the flags \-1 to \-9 are irrelevant to and so ignored -during decompression. - -Compression and decompression requirements, -in bytes, can be estimated as: - - Compression: 400k + ( 8 x block size ) - - Decompression: 100k + ( 4 x block size ), or - 100k + ( 2.5 x block size ) - -Larger block sizes give rapidly diminishing marginal returns. Most of -the compression comes from the first two or three hundred k of block -size, a fact worth bearing in mind when using -.I bzip2 -on small machines. -It is also important to appreciate that the decompression memory -requirement is set at compression time by the choice of block size. - -For files compressed with the default 900k block size, -.I bunzip2 -will require about 3700 kbytes to decompress. To support decompression -of any file on a 4 megabyte machine, -.I bunzip2 -has an option to -decompress using approximately half this amount of memory, about 2300 -kbytes. Decompression speed is also halved, so you should use this -option only where necessary. The relevant flag is -s. - -In general, try and use the largest block size memory constraints allow, -since that maximises the compression achieved. Compression and -decompression speed are virtually unaffected by block size. - -Another significant point applies to files which fit in a single block --- that means most files you'd encounter using a large block size. The -amount of real memory touched is proportional to the size of the file, -since the file is smaller than a block. For example, compressing a file -20,000 bytes long with the flag -9 will cause the compressor to -allocate around 7600k of memory, but only touch 400k + 20000 * 8 = 560 -kbytes of it. Similarly, the decompressor will allocate 3700k but only -touch 100k + 20000 * 4 = 180 kbytes. - -Here is a table which summarises the maximum memory usage for different -block sizes. Also recorded is the total compressed size for 14 files of -the Calgary Text Compression Corpus totalling 3,141,622 bytes. This -column gives some feel for how compression varies with block size. -These figures tend to understate the advantage of larger block sizes for -larger files, since the Corpus is dominated by smaller files. - - Compress Decompress Decompress Corpus - Flag usage usage -s usage Size - - -1 1200k 500k 350k 914704 - -2 2000k 900k 600k 877703 - -3 2800k 1300k 850k 860338 - -4 3600k 1700k 1100k 846899 - -5 4400k 2100k 1350k 845160 - -6 5200k 2500k 1600k 838626 - -7 6100k 2900k 1850k 834096 - -8 6800k 3300k 2100k 828642 - -9 7600k 3700k 2350k 828642 - -.SH RECOVERING DATA FROM DAMAGED FILES -.I bzip2 -compresses files in blocks, usually 900kbytes long. Each -block is handled independently. If a media or transmission error causes -a multi-block .bz2 -file to become damaged, it may be possible to -recover data from the undamaged blocks in the file. - -The compressed representation of each block is delimited by a 48-bit -pattern, which makes it possible to find the block boundaries with -reasonable certainty. Each block also carries its own 32-bit CRC, so -damaged blocks can be distinguished from undamaged ones. - -.I bzip2recover -is a simple program whose purpose is to search for -blocks in .bz2 files, and write each block out into its own .bz2 -file. You can then use -.I bzip2 -\-t -to test the -integrity of the resulting files, and decompress those which are -undamaged. - -.I bzip2recover -takes a single argument, the name of the damaged file, -and writes a number of files "rec0001file.bz2", -"rec0002file.bz2", etc, containing the extracted blocks. -The output filenames are designed so that the use of -wildcards in subsequent processing -- for example, -"bzip2 -dc rec*file.bz2 > recovered_data" -- lists the files in -the correct order. - -.I bzip2recover -should be of most use dealing with large .bz2 -files, as these will contain many blocks. It is clearly -futile to use it on damaged single-block files, since a -damaged block cannot be recovered. If you wish to minimise -any potential data loss through media or transmission errors, -you might consider compressing with a smaller -block size. - -.SH PERFORMANCE NOTES -The sorting phase of compression gathers together similar strings in the -file. Because of this, files containing very long runs of repeated -symbols, like "aabaabaabaab ..." (repeated several hundred times) may -compress more slowly than normal. Versions 0.9.5 and above fare much -better than previous versions in this respect. The ratio between -worst-case and average-case compression time is in the region of 10:1. -For previous versions, this figure was more like 100:1. You can use the -\-vvvv option to monitor progress in great detail, if you want. - -Decompression speed is unaffected by these phenomena. - -.I bzip2 -usually allocates several megabytes of memory to operate -in, and then charges all over it in a fairly random fashion. This means -that performance, both for compressing and decompressing, is largely -determined by the speed at which your machine can service cache misses. -Because of this, small changes to the code to reduce the miss rate have -been observed to give disproportionately large performance improvements. -I imagine -.I bzip2 -will perform best on machines with very large caches. - -.SH CAVEATS -I/O error messages are not as helpful as they could be. -.I bzip2 -tries hard to detect I/O errors and exit cleanly, but the details of -what the problem is sometimes seem rather misleading. - -This manual page pertains to version 1.0 of -.I bzip2. -Compressed -data created by this version is entirely forwards and backwards -compatible with the previous public releases, versions 0.1pl2, 0.9.0 -and 0.9.5, -but with the following exception: 0.9.0 and above can correctly -decompress multiple concatenated compressed files. 0.1pl2 cannot do -this; it will stop after decompressing just the first file in the -stream. - -.I bzip2recover -uses 32-bit integers to represent bit positions in -compressed files, so it cannot handle compressed files more than 512 -megabytes long. This could easily be fixed. - -.SH AUTHOR -Julian Seward, jseward@acm.org. - -http://sourceware.cygnus.com/bzip2 -http://www.muraroa.demon.co.uk - -The ideas embodied in -.I bzip2 -are due to (at least) the following -people: Michael Burrows and David Wheeler (for the block sorting -transformation), David Wheeler (again, for the Huffman coder), Peter -Fenwick (for the structured coding model in the original -.I bzip, -and many refinements), and Alistair Moffat, Radford Neal and Ian Witten -(for the arithmetic coder in the original -.I bzip). -I am much -indebted for their help, support and advice. See the manual in the -source distribution for pointers to sources of documentation. Christian -von Roques encouraged me to look for faster sorting algorithms, so as to -speed up compression. Bela Lubkin encouraged me to improve the -worst-case compression performance. Many people sent patches, helped -with portability problems, lent machines, gave advice and were generally -helpful. diff --git a/winsup/bz2lib/bzip2.1.preformatted b/winsup/bz2lib/bzip2.1.preformatted deleted file mode 100644 index 9f18339..0000000 --- a/winsup/bz2lib/bzip2.1.preformatted +++ /dev/null @@ -1,462 +0,0 @@ - - - -bzip2(1) bzip2(1) - - -NNAAMMEE - bzip2, bunzip2 - a block-sorting file compressor, v1.0 - bzcat - decompresses files to stdout - bzip2recover - recovers data from damaged bzip2 files - - -SSYYNNOOPPSSIISS - bbzziipp22 [ --ccddffkkqqssttvvzzVVLL112233445566778899 ] [ _f_i_l_e_n_a_m_e_s _._._. ] - bbuunnzziipp22 [ --ffkkvvssVVLL ] [ _f_i_l_e_n_a_m_e_s _._._. ] - bbzzccaatt [ --ss ] [ _f_i_l_e_n_a_m_e_s _._._. ] - bbzziipp22rreeccoovveerr _f_i_l_e_n_a_m_e - - -DDEESSCCRRIIPPTTIIOONN - _b_z_i_p_2 compresses files using the Burrows-Wheeler block - sorting text compression algorithm, and Huffman coding. - Compression is generally considerably better than that - achieved by more conventional LZ77/LZ78-based compressors, - and approaches the performance of the PPM family of sta- - tistical compressors. - - The command-line options are deliberately very similar to - those of _G_N_U _g_z_i_p_, but they are not identical. - - _b_z_i_p_2 expects a list of file names to accompany the com- - mand-line flags. Each file is replaced by a compressed - version of itself, with the name "original_name.bz2". - Each compressed file has the same modification date, per- - missions, and, when possible, ownership as the correspond- - ing original, so that these properties can be correctly - restored at decompression time. File name handling is - naive in the sense that there is no mechanism for preserv- - ing original file names, permissions, ownerships or dates - in filesystems which lack these concepts, or have serious - file name length restrictions, such as MS-DOS. - - _b_z_i_p_2 and _b_u_n_z_i_p_2 will by default not overwrite existing - files. If you want this to happen, specify the -f flag. - - If no file names are specified, _b_z_i_p_2 compresses from - standard input to standard output. In this case, _b_z_i_p_2 - will decline to write compressed output to a terminal, as - this would be entirely incomprehensible and therefore - pointless. - - _b_u_n_z_i_p_2 (or _b_z_i_p_2 _-_d_) decompresses all specified files. - Files which were not created by _b_z_i_p_2 will be detected and - ignored, and a warning issued. _b_z_i_p_2 attempts to guess - the filename for the decompressed file from that of the - compressed file as follows: - - filename.bz2 becomes filename - filename.bz becomes filename - filename.tbz2 becomes filename.tar - - - - 1 - - - - - -bzip2(1) bzip2(1) - - - filename.tbz becomes filename.tar - anyothername becomes anyothername.out - - If the file does not end in one of the recognised endings, - _._b_z_2_, _._b_z_, _._t_b_z_2 or _._t_b_z_, _b_z_i_p_2 complains that it cannot - guess the name of the original file, and uses the original - name with _._o_u_t appended. - - As with compression, supplying no filenames causes decom- - pression from standard input to standard output. - - _b_u_n_z_i_p_2 will correctly decompress a file which is the con- - catenation of two or more compressed files. The result is - the concatenation of the corresponding uncompressed files. - Integrity testing (-t) of concatenated compressed files is - also supported. - - You can also compress or decompress files to the standard - output by giving the -c flag. Multiple files may be com- - pressed and decompressed like this. The resulting outputs - are fed sequentially to stdout. Compression of multiple - files in this manner generates a stream containing multi- - ple compressed file representations. Such a stream can be - decompressed correctly only by _b_z_i_p_2 version 0.9.0 or - later. Earlier versions of _b_z_i_p_2 will stop after decom- - pressing the first file in the stream. - - _b_z_c_a_t (or _b_z_i_p_2 _-_d_c_) decompresses all specified files to - the standard output. - - _b_z_i_p_2 will read arguments from the environment variables - _B_Z_I_P_2 and _B_Z_I_P_, in that order, and will process them - before any arguments read from the command line. This - gives a convenient way to supply default arguments. - - Compression is always performed, even if the compressed - file is slightly larger than the original. Files of less - than about one hundred bytes tend to get larger, since the - compression mechanism has a constant overhead in the - region of 50 bytes. Random data (including the output of - most file compressors) is coded at about 8.05 bits per - byte, giving an expansion of around 0.5%. - - As a self-check for your protection, _b_z_i_p_2 uses 32-bit - CRCs to make sure that the decompressed version of a file - is identical to the original. This guards against corrup- - tion of the compressed data, and against undetected bugs - in _b_z_i_p_2 (hopefully very unlikely). The chances of data - corruption going undetected is microscopic, about one - chance in four billion for each file processed. Be aware, - though, that the check occurs upon decompression, so it - can only tell you that something is wrong. It can't help - you recover the original uncompressed data. You can use - _b_z_i_p_2_r_e_c_o_v_e_r to try to recover data from damaged files. - - - - 2 - - - - - -bzip2(1) bzip2(1) - - - Return values: 0 for a normal exit, 1 for environmental - problems (file not found, invalid flags, I/O errors, &c), - 2 to indicate a corrupt compressed file, 3 for an internal - consistency error (eg, bug) which caused _b_z_i_p_2 to panic. - - -OOPPTTIIOONNSS - --cc ----ssttddoouutt - Compress or decompress to standard output. - - --dd ----ddeeccoommpprreessss - Force decompression. _b_z_i_p_2_, _b_u_n_z_i_p_2 and _b_z_c_a_t are - really the same program, and the decision about - what actions to take is done on the basis of which - name is used. This flag overrides that mechanism, - and forces _b_z_i_p_2 to decompress. - - --zz ----ccoommpprreessss - The complement to -d: forces compression, regard- - less of the invokation name. - - --tt ----tteesstt - Check integrity of the specified file(s), but don't - decompress them. This really performs a trial - decompression and throws away the result. - - --ff ----ffoorrccee - Force overwrite of output files. Normally, _b_z_i_p_2 - will not overwrite existing output files. Also - forces _b_z_i_p_2 to break hard links to files, which it - otherwise wouldn't do. - - --kk ----kkeeeepp - Keep (don't delete) input files during compression - or decompression. - - --ss ----ssmmaallll - Reduce memory usage, for compression, decompression - and testing. Files are decompressed and tested - using a modified algorithm which only requires 2.5 - bytes per block byte. This means any file can be - decompressed in 2300k of memory, albeit at about - half the normal speed. - - During compression, -s selects a block size of - 200k, which limits memory use to around the same - figure, at the expense of your compression ratio. - In short, if your machine is low on memory (8 - megabytes or less), use -s for everything. See - MEMORY MANAGEMENT below. - - --qq ----qquuiieett - Suppress non-essential warning messages. Messages - pertaining to I/O errors and other critical events - - - - 3 - - - - - -bzip2(1) bzip2(1) - - - will not be suppressed. - - --vv ----vveerrbboossee - Verbose mode -- show the compression ratio for each - file processed. Further -v's increase the ver- - bosity level, spewing out lots of information which - is primarily of interest for diagnostic purposes. - - --LL ----lliicceennssee --VV ----vveerrssiioonn - Display the software version, license terms and - conditions. - - --11 ttoo --99 - Set the block size to 100 k, 200 k .. 900 k when - compressing. Has no effect when decompressing. - See MEMORY MANAGEMENT below. - - ---- Treats all subsequent arguments as file names, even - if they start with a dash. This is so you can han- - dle files with names beginning with a dash, for - example: bzip2 -- -myfilename. - - ----rreeppeettiittiivvee--ffaasstt ----rreeppeettiittiivvee--bbeesstt - These flags are redundant in versions 0.9.5 and - above. They provided some coarse control over the - behaviour of the sorting algorithm in earlier ver- - sions, which was sometimes useful. 0.9.5 and above - have an improved algorithm which renders these - flags irrelevant. - - -MMEEMMOORRYY MMAANNAAGGEEMMEENNTT - _b_z_i_p_2 compresses large files in blocks. The block size - affects both the compression ratio achieved, and the - amount of memory needed for compression and decompression. - The flags -1 through -9 specify the block size to be - 100,000 bytes through 900,000 bytes (the default) respec- - tively. At decompression time, the block size used for - compression is read from the header of the compressed - file, and _b_u_n_z_i_p_2 then allocates itself just enough memory - to decompress the file. Since block sizes are stored in - compressed files, it follows that the flags -1 to -9 are - irrelevant to and so ignored during decompression. - - Compression and decompression requirements, in bytes, can - be estimated as: - - Compression: 400k + ( 8 x block size ) - - Decompression: 100k + ( 4 x block size ), or - 100k + ( 2.5 x block size ) - - Larger block sizes give rapidly diminishing marginal - returns. Most of the compression comes from the first two - - - - 4 - - - - - -bzip2(1) bzip2(1) - - - or three hundred k of block size, a fact worth bearing in - mind when using _b_z_i_p_2 on small machines. It is also - important to appreciate that the decompression memory - requirement is set at compression time by the choice of - block size. - - For files compressed with the default 900k block size, - _b_u_n_z_i_p_2 will require about 3700 kbytes to decompress. To - support decompression of any file on a 4 megabyte machine, - _b_u_n_z_i_p_2 has an option to decompress using approximately - half this amount of memory, about 2300 kbytes. Decompres- - sion speed is also halved, so you should use this option - only where necessary. The relevant flag is -s. - - In general, try and use the largest block size memory con- - straints allow, since that maximises the compression - achieved. Compression and decompression speed are virtu- - ally unaffected by block size. - - Another significant point applies to files which fit in a - single block -- that means most files you'd encounter - using a large block size. The amount of real memory - touched is proportional to the size of the file, since the - file is smaller than a block. For example, compressing a - file 20,000 bytes long with the flag -9 will cause the - compressor to allocate around 7600k of memory, but only - touch 400k + 20000 * 8 = 560 kbytes of it. Similarly, the - decompressor will allocate 3700k but only touch 100k + - 20000 * 4 = 180 kbytes. - - Here is a table which summarises the maximum memory usage - for different block sizes. Also recorded is the total - compressed size for 14 files of the Calgary Text Compres- - sion Corpus totalling 3,141,622 bytes. This column gives - some feel for how compression varies with block size. - These figures tend to understate the advantage of larger - block sizes for larger files, since the Corpus is domi- - nated by smaller files. - - Compress Decompress Decompress Corpus - Flag usage usage -s usage Size - - -1 1200k 500k 350k 914704 - -2 2000k 900k 600k 877703 - -3 2800k 1300k 850k 860338 - -4 3600k 1700k 1100k 846899 - -5 4400k 2100k 1350k 845160 - -6 5200k 2500k 1600k 838626 - -7 6100k 2900k 1850k 834096 - -8 6800k 3300k 2100k 828642 - -9 7600k 3700k 2350k 828642 - - - - - - - 5 - - - - - -bzip2(1) bzip2(1) - - -RREECCOOVVEERRIINNGG DDAATTAA FFRROOMM DDAAMMAAGGEEDD FFIILLEESS - _b_z_i_p_2 compresses files in blocks, usually 900kbytes long. - Each block is handled independently. If a media or trans- - mission error causes a multi-block .bz2 file to become - damaged, it may be possible to recover data from the - undamaged blocks in the file. - - The compressed representation of each block is delimited - by a 48-bit pattern, which makes it possible to find the - block boundaries with reasonable certainty. Each block - also carries its own 32-bit CRC, so damaged blocks can be - distinguished from undamaged ones. - - _b_z_i_p_2_r_e_c_o_v_e_r is a simple program whose purpose is to - search for blocks in .bz2 files, and write each block out - into its own .bz2 file. You can then use _b_z_i_p_2 -t to test - the integrity of the resulting files, and decompress those - which are undamaged. - - _b_z_i_p_2_r_e_c_o_v_e_r takes a single argument, the name of the dam- - aged file, and writes a number of files "rec0001file.bz2", - "rec0002file.bz2", etc, containing the extracted blocks. - The output filenames are designed so that the use of - wildcards in subsequent processing -- for example, "bzip2 - -dc rec*file.bz2 > recovered_data" -- lists the files in - the correct order. - - _b_z_i_p_2_r_e_c_o_v_e_r should be of most use dealing with large .bz2 - files, as these will contain many blocks. It is clearly - futile to use it on damaged single-block files, since a - damaged block cannot be recovered. If you wish to min- - imise any potential data loss through media or transmis- - sion errors, you might consider compressing with a smaller - block size. - - -PPEERRFFOORRMMAANNCCEE NNOOTTEESS - The sorting phase of compression gathers together similar - strings in the file. Because of this, files containing - very long runs of repeated symbols, like "aabaabaabaab - ..." (repeated several hundred times) may compress more - slowly than normal. Versions 0.9.5 and above fare much - better than previous versions in this respect. The ratio - between worst-case and average-case compression time is in - the region of 10:1. For previous versions, this figure - was more like 100:1. You can use the -vvvv option to mon- - itor progress in great detail, if you want. - - Decompression speed is unaffected by these phenomena. - - _b_z_i_p_2 usually allocates several megabytes of memory to - operate in, and then charges all over it in a fairly ran- - dom fashion. This means that performance, both for com- - pressing and decompressing, is largely determined by the - - - - 6 - - - - - -bzip2(1) bzip2(1) - - - speed at which your machine can service cache misses. - Because of this, small changes to the code to reduce the - miss rate have been observed to give disproportionately - large performance improvements. I imagine _b_z_i_p_2 will per- - form best on machines with very large caches. - - -CCAAVVEEAATTSS - I/O error messages are not as helpful as they could be. - _b_z_i_p_2 tries hard to detect I/O errors and exit cleanly, - but the details of what the problem is sometimes seem - rather misleading. - - This manual page pertains to version 1.0 of _b_z_i_p_2_. Com- - pressed data created by this version is entirely forwards - and backwards compatible with the previous public - releases, versions 0.1pl2, 0.9.0 and 0.9.5, but with the - following exception: 0.9.0 and above can correctly decom- - press multiple concatenated compressed files. 0.1pl2 can- - not do this; it will stop after decompressing just the - first file in the stream. - - _b_z_i_p_2_r_e_c_o_v_e_r uses 32-bit integers to represent bit posi- - tions in compressed files, so it cannot handle compressed - files more than 512 megabytes long. This could easily be - fixed. - - -AAUUTTHHOORR - Julian Seward, jseward@acm.org. - - http://sourceware.cygnus.com/bzip2 - http://www.muraroa.demon.co.uk - - The ideas embodied in _b_z_i_p_2 are due to (at least) the fol- - lowing people: Michael Burrows and David Wheeler (for the - block sorting transformation), David Wheeler (again, for - the Huffman coder), Peter Fenwick (for the structured cod- - ing model in the original _b_z_i_p_, and many refinements), and - Alistair Moffat, Radford Neal and Ian Witten (for the - arithmetic coder in the original _b_z_i_p_)_. I am much - indebted for their help, support and advice. See the man- - ual in the source distribution for pointers to sources of - documentation. Christian von Roques encouraged me to look - for faster sorting algorithms, so as to speed up compres- - sion. Bela Lubkin encouraged me to improve the worst-case - compression performance. Many people sent patches, helped - with portability problems, lent machines, gave advice and - were generally helpful. - - - - - - - - - 7 - - diff --git a/winsup/bz2lib/bzip2.c b/winsup/bz2lib/bzip2.c deleted file mode 100644 index 56adfdc..0000000 --- a/winsup/bz2lib/bzip2.c +++ /dev/null @@ -1,2044 +0,0 @@ - -/*-----------------------------------------------------------*/ -/*--- A block-sorting, lossless compressor bzip2.c ---*/ -/*-----------------------------------------------------------*/ - -/*-- - This file is a part of bzip2 and/or libbzip2, a program and - library for lossless, block-sorting data compression. - - Copyright (C) 1996-2000 Julian R Seward. All rights reserved. - - Redistribution and use in source and binary forms, with or without - modification, are permitted provided that the following conditions - are met: - - 1. Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - - 2. The origin of this software must not be misrepresented; you must - not claim that you wrote the original software. If you use this - software in a product, an acknowledgment in the product - documentation would be appreciated but is not required. - - 3. Altered source versions must be plainly marked as such, and must - not be misrepresented as being the original software. - - 4. The name of the author may not be used to endorse or promote - products derived from this software without specific prior written - permission. - - THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS - OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED - WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY - DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE - GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS - INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, - WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING - NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS - SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - - Julian Seward, Cambridge, UK. - jseward@acm.org - bzip2/libbzip2 version 1.0 of 21 March 2000 - - This program is based on (at least) the work of: - Mike Burrows - David Wheeler - Peter Fenwick - Alistair Moffat - Radford Neal - Ian H. Witten - Robert Sedgewick - Jon L. Bentley - - For more information on these sources, see the manual. ---*/ - - -/*----------------------------------------------------*/ -/*--- IMPORTANT ---*/ -/*----------------------------------------------------*/ - -/*-- - WARNING: - This program and library (attempts to) compress data by - performing several non-trivial transformations on it. - Unless you are 100% familiar with *all* the algorithms - contained herein, and with the consequences of modifying them, - you should NOT meddle with the compression or decompression - machinery. Incorrect changes can and very likely *will* - lead to disasterous loss of data. - - DISCLAIMER: - I TAKE NO RESPONSIBILITY FOR ANY LOSS OF DATA ARISING FROM THE - USE OF THIS PROGRAM, HOWSOEVER CAUSED. - - Every compression of a file implies an assumption that the - compressed file can be decompressed to reproduce the original. - Great efforts in design, coding and testing have been made to - ensure that this program works correctly. However, the - complexity of the algorithms, and, in particular, the presence - of various special cases in the code which occur with very low - but non-zero probability make it impossible to rule out the - possibility of bugs remaining in the program. DO NOT COMPRESS - ANY DATA WITH THIS PROGRAM AND/OR LIBRARY UNLESS YOU ARE PREPARED - TO ACCEPT THE POSSIBILITY, HOWEVER SMALL, THAT THE DATA WILL - NOT BE RECOVERABLE. - - That is not to say this program is inherently unreliable. - Indeed, I very much hope the opposite is true. bzip2/libbzip2 - has been carefully constructed and extensively tested. - - PATENTS: - To the best of my knowledge, bzip2/libbzip2 does not use any - patented algorithms. However, I do not have the resources - available to carry out a full patent search. Therefore I cannot - give any guarantee of the above statement. ---*/ - - - -/*----------------------------------------------------*/ -/*--- and now for something much more pleasant :-) ---*/ -/*----------------------------------------------------*/ - -/*---------------------------------------------*/ -/*-- - Place a 1 beside your platform, and 0 elsewhere. ---*/ - -/*-- - Generic 32-bit Unix. - Also works on 64-bit Unix boxes. ---*/ -#define BZ_UNIX 1 - -/*-- - Win32, as seen by Jacob Navia's excellent - port of (Chris Fraser & David Hanson)'s excellent - lcc compiler. ---*/ -#define BZ_LCCWIN32 0 - -#if defined(_WIN32) && !defined(__CYGWIN__) -#undef BZ_LCCWIN32 -#define BZ_LCCWIN32 1 -#undef BZ_UNIX -#define BZ_UNIX 0 -#endif - - -/*---------------------------------------------*/ -/*-- - Some stuff for all platforms. ---*/ - -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <signal.h> -#include <math.h> -#include <errno.h> -#include <ctype.h> -#include "bzlib.h" - -#define ERROR_IF_EOF(i) { if ((i) == EOF) ioError(); } -#define ERROR_IF_NOT_ZERO(i) { if ((i) != 0) ioError(); } -#define ERROR_IF_MINUS_ONE(i) { if ((i) == (-1)) ioError(); } - - -/*---------------------------------------------*/ -/*-- - Platform-specific stuff. ---*/ - -#if BZ_UNIX -# include <sys/types.h> -# include <utime.h> -# include <unistd.h> -# include <sys/stat.h> -# include <sys/times.h> - -# define PATH_SEP '/' -# define MY_LSTAT lstat -# define MY_S_IFREG S_ISREG -# define MY_STAT stat - -# define APPEND_FILESPEC(root, name) \ - root=snocString((root), (name)) - -# define APPEND_FLAG(root, name) \ - root=snocString((root), (name)) - -# define SET_BINARY_MODE(fd) /**/ - -# ifdef __GNUC__ -# define NORETURN __attribute__ ((noreturn)) -# else -# define NORETURN /**/ -# endif -# ifdef __DJGPP__ -# include <io.h> -# include <fcntl.h> -# undef MY_LSTAT -# define MY_LSTAT stat -# undef SET_BINARY_MODE -# define SET_BINARY_MODE(fd) \ - do { \ - int retVal = setmode ( fileno ( fd ), \ - O_BINARY ); \ - ERROR_IF_MINUS_ONE ( retVal ); \ - } while ( 0 ) -# endif -# ifdef __CYGWIN__ -# include <io.h> -# include <fcntl.h> -# undef SET_BINARY_MODE -# define SET_BINARY_MODE(fd) \ - do { \ - int retVal = setmode ( fileno ( fd ), \ - O_BINARY ); \ - ERROR_IF_MINUS_ONE ( retVal ); \ - } while ( 0 ) -# endif -#endif - - - -#if BZ_LCCWIN32 -# include <io.h> -# include <fcntl.h> -# include <sys\stat.h> - -# define NORETURN /**/ -# define PATH_SEP '\\' -# define MY_LSTAT _stat -# define MY_STAT _stat -# define MY_S_IFREG(x) ((x) & _S_IFREG) - -# define APPEND_FLAG(root, name) \ - root=snocString((root), (name)) - -# if 0 - /*-- lcc-win32 seems to expand wildcards itself --*/ -# define APPEND_FILESPEC(root, spec) \ - do { \ - if ((spec)[0] == '-') { \ - root = snocString((root), (spec)); \ - } else { \ - struct _finddata_t c_file; \ - long hFile; \ - hFile = _findfirst((spec), &c_file); \ - if ( hFile == -1L ) { \ - root = snocString ((root), (spec)); \ - } else { \ - int anInt = 0; \ - while ( anInt == 0 ) { \ - root = snocString((root), \ - &c_file.name[0]); \ - anInt = _findnext(hFile, &c_file); \ - } \ - } \ - } \ - } while ( 0 ) -# else -# define APPEND_FILESPEC(root, name) \ - root = snocString ((root), (name)) -# endif - -# define SET_BINARY_MODE(fd) \ - do { \ - int retVal = setmode ( fileno ( fd ), \ - O_BINARY ); \ - ERROR_IF_MINUS_ONE ( retVal ); \ - } while ( 0 ) - -#endif - - -/*---------------------------------------------*/ -/*-- - Some more stuff for all platforms :-) ---*/ - -typedef char Char; -typedef unsigned char Bool; -typedef unsigned char UChar; -typedef int Int32; -typedef unsigned int UInt32; -typedef short Int16; -typedef unsigned short UInt16; - -#define True ((Bool)1) -#define False ((Bool)0) - -/*-- - IntNative is your platform's `native' int size. - Only here to avoid probs with 64-bit platforms. ---*/ -typedef int IntNative; - - -/*---------------------------------------------------*/ -/*--- Misc (file handling) data decls ---*/ -/*---------------------------------------------------*/ - -Int32 verbosity; -Bool keepInputFiles, smallMode, deleteOutputOnInterrupt; -Bool forceOverwrite, testFailsExist, unzFailsExist, noisy; -Int32 numFileNames, numFilesProcessed, blockSize100k; -Int32 exitValue; - -/*-- source modes; F==file, I==stdin, O==stdout --*/ -#define SM_I2O 1 -#define SM_F2O 2 -#define SM_F2F 3 - -/*-- operation modes --*/ -#define OM_Z 1 -#define OM_UNZ 2 -#define OM_TEST 3 - -Int32 opMode; -Int32 srcMode; - -#define FILE_NAME_LEN 1034 - -Int32 longestFileName; -Char inName [FILE_NAME_LEN]; -Char outName[FILE_NAME_LEN]; -Char tmpName[FILE_NAME_LEN]; -Char *progName; -Char progNameReally[FILE_NAME_LEN]; -FILE *outputHandleJustInCase; -Int32 workFactor; - -static void panic ( Char* ) NORETURN; -static void ioError ( void ) NORETURN; -static void outOfMemory ( void ) NORETURN; -static void configError ( void ) NORETURN; -static void crcError ( void ) NORETURN; -static void cleanUpAndFail ( Int32 ) NORETURN; -static void compressedStreamEOF ( void ) NORETURN; - -static void copyFileName ( Char*, Char* ); -static void* myMalloc ( Int32 ); - - - -/*---------------------------------------------------*/ -/*--- An implementation of 64-bit ints. Sigh. ---*/ -/*--- Roll on widespread deployment of ANSI C9X ! ---*/ -/*---------------------------------------------------*/ - -typedef - struct { UChar b[8]; } - UInt64; - -static -void uInt64_from_UInt32s ( UInt64* n, UInt32 lo32, UInt32 hi32 ) -{ - n->b[7] = (UChar)((hi32 >> 24) & 0xFF); - n->b[6] = (UChar)((hi32 >> 16) & 0xFF); - n->b[5] = (UChar)((hi32 >> 8) & 0xFF); - n->b[4] = (UChar) (hi32 & 0xFF); - n->b[3] = (UChar)((lo32 >> 24) & 0xFF); - n->b[2] = (UChar)((lo32 >> 16) & 0xFF); - n->b[1] = (UChar)((lo32 >> 8) & 0xFF); - n->b[0] = (UChar) (lo32 & 0xFF); -} - -static -double uInt64_to_double ( UInt64* n ) -{ - Int32 i; - double base = 1.0; - double sum = 0.0; - for (i = 0; i < 8; i++) { - sum += base * (double)(n->b[i]); - base *= 256.0; - } - return sum; -} - -static -void uInt64_add ( UInt64* src, UInt64* dst ) -{ - Int32 i; - Int32 carry = 0; - for (i = 0; i < 8; i++) { - carry += ( ((Int32)src->b[i]) + ((Int32)dst->b[i]) ); - dst->b[i] = (UChar)(carry & 0xFF); - carry >>= 8; - } -} - -static -void uInt64_sub ( UInt64* src, UInt64* dst ) -{ - Int32 t, i; - Int32 borrow = 0; - for (i = 0; i < 8; i++) { - t = ((Int32)dst->b[i]) - ((Int32)src->b[i]) - borrow; - if (t < 0) { - dst->b[i] = (UChar)(t + 256); - borrow = 1; - } else { - dst->b[i] = (UChar)t; - borrow = 0; - } - } -} - -static -void uInt64_mul ( UInt64* a, UInt64* b, UInt64* r_hi, UInt64* r_lo ) -{ - UChar sum[16]; - Int32 ia, ib, carry; - for (ia = 0; ia < 16; ia++) sum[ia] = 0; - for (ia = 0; ia < 8; ia++) { - carry = 0; - for (ib = 0; ib < 8; ib++) { - carry += ( ((Int32)sum[ia+ib]) - + ((Int32)a->b[ia]) * ((Int32)b->b[ib]) ); - sum[ia+ib] = (UChar)(carry & 0xFF); - carry >>= 8; - } - sum[ia+8] = (UChar)(carry & 0xFF); - if ((carry >>= 8) != 0) panic ( "uInt64_mul" ); - } - - for (ia = 0; ia < 8; ia++) r_hi->b[ia] = sum[ia+8]; - for (ia = 0; ia < 8; ia++) r_lo->b[ia] = sum[ia]; -} - - -static -void uInt64_shr1 ( UInt64* n ) -{ - Int32 i; - for (i = 0; i < 8; i++) { - n->b[i] >>= 1; - if (i < 7 && (n->b[i+1] & 1)) n->b[i] |= 0x80; - } -} - -static -void uInt64_shl1 ( UInt64* n ) -{ - Int32 i; - for (i = 7; i >= 0; i--) { - n->b[i] <<= 1; - if (i > 0 && (n->b[i-1] & 0x80)) n->b[i]++; - } -} - -static -Bool uInt64_isZero ( UInt64* n ) -{ - Int32 i; - for (i = 0; i < 8; i++) - if (n->b[i] != 0) return 0; - return 1; -} - -static -Int32 uInt64_qrm10 ( UInt64* n ) -{ - /* Divide *n by 10, and return the remainder. Long division - is difficult, so we cheat and instead multiply by - 0xCCCC CCCC CCCC CCCD, which is 0.8 (viz, 0.1 << 3). - */ - Int32 i; - UInt64 tmp1, tmp2, n_orig, zero_point_eight; - - zero_point_eight.b[1] = zero_point_eight.b[2] = - zero_point_eight.b[3] = zero_point_eight.b[4] = - zero_point_eight.b[5] = zero_point_eight.b[6] = - zero_point_eight.b[7] = 0xCC; - zero_point_eight.b[0] = 0xCD; - - n_orig = *n; - - /* divide n by 10, - by multiplying by 0.8 and then shifting right 3 times */ - uInt64_mul ( n, &zero_point_eight, &tmp1, &tmp2 ); - uInt64_shr1(&tmp1); uInt64_shr1(&tmp1); uInt64_shr1(&tmp1); - *n = tmp1; - - /* tmp1 = 8*n, tmp2 = 2*n */ - uInt64_shl1(&tmp1); uInt64_shl1(&tmp1); uInt64_shl1(&tmp1); - tmp2 = *n; uInt64_shl1(&tmp2); - - /* tmp1 = 10*n */ - uInt64_add ( &tmp2, &tmp1 ); - - /* n_orig = n_orig - 10*n */ - uInt64_sub ( &tmp1, &n_orig ); - - /* n_orig should now hold quotient, in range 0 .. 9 */ - for (i = 7; i >= 1; i--) - if (n_orig.b[i] != 0) panic ( "uInt64_qrm10(1)" ); - if (n_orig.b[0] > 9) - panic ( "uInt64_qrm10(2)" ); - - return (int)n_orig.b[0]; -} - -/* ... and the Whole Entire Point of all this UInt64 stuff is - so that we can supply the following function. -*/ -static -void uInt64_toAscii ( char* outbuf, UInt64* n ) -{ - Int32 i, q; - UChar buf[32]; - Int32 nBuf = 0; - UInt64 n_copy = *n; - do { - q = uInt64_qrm10 ( &n_copy ); - buf[nBuf] = q + '0'; - nBuf++; - } while (!uInt64_isZero(&n_copy)); - outbuf[nBuf] = 0; - for (i = 0; i < nBuf; i++) outbuf[i] = buf[nBuf-i-1]; -} - - -/*---------------------------------------------------*/ -/*--- Processing of complete files and streams ---*/ -/*---------------------------------------------------*/ - -/*---------------------------------------------*/ -static -Bool myfeof ( FILE* f ) -{ - Int32 c = fgetc ( f ); - if (c == EOF) return True; - ungetc ( c, f ); - return False; -} - - -/*---------------------------------------------*/ -static -void compressStream ( FILE *stream, FILE *zStream ) -{ - BZFILE* bzf = NULL; - UChar ibuf[5000]; - Int32 nIbuf; - UInt32 nbytes_in_lo32, nbytes_in_hi32; - UInt32 nbytes_out_lo32, nbytes_out_hi32; - Int32 bzerr, bzerr_dummy, ret; - - SET_BINARY_MODE(stream); - SET_BINARY_MODE(zStream); - - if (ferror(stream)) goto errhandler_io; - if (ferror(zStream)) goto errhandler_io; - - bzf = BZ2_bzWriteOpen ( &bzerr, zStream, - blockSize100k, verbosity, workFactor ); - if (bzerr != BZ_OK) goto errhandler; - - if (verbosity >= 2) fprintf ( stderr, "\n" ); - - while (True) { - - if (myfeof(stream)) break; - nIbuf = fread ( ibuf, sizeof(UChar), 5000, stream ); - if (ferror(stream)) goto errhandler_io; - if (nIbuf > 0) BZ2_bzWrite ( &bzerr, bzf, (void*)ibuf, nIbuf ); - if (bzerr != BZ_OK) goto errhandler; - - } - - BZ2_bzWriteClose64 ( &bzerr, bzf, 0, - &nbytes_in_lo32, &nbytes_in_hi32, - &nbytes_out_lo32, &nbytes_out_hi32 ); - if (bzerr != BZ_OK) goto errhandler; - - if (ferror(zStream)) goto errhandler_io; - ret = fflush ( zStream ); - if (ret == EOF) goto errhandler_io; - if (zStream != stdout) { - ret = fclose ( zStream ); - if (ret == EOF) goto errhandler_io; - } - if (ferror(stream)) goto errhandler_io; - ret = fclose ( stream ); - if (ret == EOF) goto errhandler_io; - - if (nbytes_in_lo32 == 0 && nbytes_in_hi32 == 0) - nbytes_in_lo32 = 1; - - if (verbosity >= 1) { - Char buf_nin[32], buf_nout[32]; - UInt64 nbytes_in, nbytes_out; - double nbytes_in_d, nbytes_out_d; - uInt64_from_UInt32s ( &nbytes_in, - nbytes_in_lo32, nbytes_in_hi32 ); - uInt64_from_UInt32s ( &nbytes_out, - nbytes_out_lo32, nbytes_out_hi32 ); - nbytes_in_d = uInt64_to_double ( &nbytes_in ); - nbytes_out_d = uInt64_to_double ( &nbytes_out ); - uInt64_toAscii ( buf_nin, &nbytes_in ); - uInt64_toAscii ( buf_nout, &nbytes_out ); - fprintf ( stderr, "%6.3f:1, %6.3f bits/byte, " - "%5.2f%% saved, %s in, %s out.\n", - nbytes_in_d / nbytes_out_d, - (8.0 * nbytes_out_d) / nbytes_in_d, - 100.0 * (1.0 - nbytes_out_d / nbytes_in_d), - buf_nin, - buf_nout - ); - } - - return; - - errhandler: - BZ2_bzWriteClose64 ( &bzerr_dummy, bzf, 1, - &nbytes_in_lo32, &nbytes_in_hi32, - &nbytes_out_lo32, &nbytes_out_hi32 ); - switch (bzerr) { - case BZ_CONFIG_ERROR: - configError(); break; - case BZ_MEM_ERROR: - outOfMemory (); break; - case BZ_IO_ERROR: - errhandler_io: - ioError(); break; - default: - panic ( "compress:unexpected error" ); - } - - panic ( "compress:end" ); - /*notreached*/ -} - - - -/*---------------------------------------------*/ -static -Bool uncompressStream ( FILE *zStream, FILE *stream ) -{ - BZFILE* bzf = NULL; - Int32 bzerr, bzerr_dummy, ret, nread, streamNo, i; - UChar obuf[5000]; - UChar unused[BZ_MAX_UNUSED]; - Int32 nUnused; - UChar* unusedTmp; - - nUnused = 0; - streamNo = 0; - - SET_BINARY_MODE(stream); - SET_BINARY_MODE(zStream); - - if (ferror(stream)) goto errhandler_io; - if (ferror(zStream)) goto errhandler_io; - - while (True) { - - bzf = BZ2_bzReadOpen ( - &bzerr, zStream, verbosity, - (int)smallMode, unused, nUnused - ); - if (bzf == NULL || bzerr != BZ_OK) goto errhandler; - streamNo++; - - while (bzerr == BZ_OK) { - nread = BZ2_bzRead ( &bzerr, bzf, obuf, 5000 ); - if (bzerr == BZ_DATA_ERROR_MAGIC) goto errhandler; - if ((bzerr == BZ_OK || bzerr == BZ_STREAM_END) && nread > 0) - fwrite ( obuf, sizeof(UChar), nread, stream ); - if (ferror(stream)) goto errhandler_io; - } - if (bzerr != BZ_STREAM_END) goto errhandler; - - BZ2_bzReadGetUnused ( &bzerr, bzf, (void**)(&unusedTmp), &nUnused ); - if (bzerr != BZ_OK) panic ( "decompress:bzReadGetUnused" ); - - for (i = 0; i < nUnused; i++) unused[i] = unusedTmp[i]; - - BZ2_bzReadClose ( &bzerr, bzf ); - if (bzerr != BZ_OK) panic ( "decompress:bzReadGetUnused" ); - - if (nUnused == 0 && myfeof(zStream)) break; - - } - - if (ferror(zStream)) goto errhandler_io; - ret = fclose ( zStream ); - if (ret == EOF) goto errhandler_io; - - if (ferror(stream)) goto errhandler_io; - ret = fflush ( stream ); - if (ret != 0) goto errhandler_io; - if (stream != stdout) { - ret = fclose ( stream ); - if (ret == EOF) goto errhandler_io; - } - if (verbosity >= 2) fprintf ( stderr, "\n " ); - return True; - - errhandler: - BZ2_bzReadClose ( &bzerr_dummy, bzf ); - switch (bzerr) { - case BZ_CONFIG_ERROR: - configError(); break; - case BZ_IO_ERROR: - errhandler_io: - ioError(); break; - case BZ_DATA_ERROR: - crcError(); - case BZ_MEM_ERROR: - outOfMemory(); - case BZ_UNEXPECTED_EOF: - compressedStreamEOF(); - case BZ_DATA_ERROR_MAGIC: - if (zStream != stdin) fclose(zStream); - if (stream != stdout) fclose(stream); - if (streamNo == 1) { - return False; - } else { - if (noisy) - fprintf ( stderr, - "\n%s: %s: trailing garbage after EOF ignored\n", - progName, inName ); - return True; - } - default: - panic ( "decompress:unexpected error" ); - } - - panic ( "decompress:end" ); - return True; /*notreached*/ -} - - -/*---------------------------------------------*/ -static -Bool testStream ( FILE *zStream ) -{ - BZFILE* bzf = NULL; - Int32 bzerr, bzerr_dummy, ret, nread, streamNo, i; - UChar obuf[5000]; - UChar unused[BZ_MAX_UNUSED]; - Int32 nUnused; - UChar* unusedTmp; - - nUnused = 0; - streamNo = 0; - - SET_BINARY_MODE(zStream); - if (ferror(zStream)) goto errhandler_io; - - while (True) { - - bzf = BZ2_bzReadOpen ( - &bzerr, zStream, verbosity, - (int)smallMode, unused, nUnused - ); - if (bzf == NULL || bzerr != BZ_OK) goto errhandler; - streamNo++; - - while (bzerr == BZ_OK) { - nread = BZ2_bzRead ( &bzerr, bzf, obuf, 5000 ); - if (bzerr == BZ_DATA_ERROR_MAGIC) goto errhandler; - } - if (bzerr != BZ_STREAM_END) goto errhandler; - - BZ2_bzReadGetUnused ( &bzerr, bzf, (void**)(&unusedTmp), &nUnused ); - if (bzerr != BZ_OK) panic ( "test:bzReadGetUnused" ); - - for (i = 0; i < nUnused; i++) unused[i] = unusedTmp[i]; - - BZ2_bzReadClose ( &bzerr, bzf ); - if (bzerr != BZ_OK) panic ( "test:bzReadGetUnused" ); - if (nUnused == 0 && myfeof(zStream)) break; - - } - - if (ferror(zStream)) goto errhandler_io; - ret = fclose ( zStream ); - if (ret == EOF) goto errhandler_io; - - if (verbosity >= 2) fprintf ( stderr, "\n " ); - return True; - - errhandler: - BZ2_bzReadClose ( &bzerr_dummy, bzf ); - if (verbosity == 0) - fprintf ( stderr, "%s: %s: ", progName, inName ); - switch (bzerr) { - case BZ_CONFIG_ERROR: - configError(); break; - case BZ_IO_ERROR: - errhandler_io: - ioError(); break; - case BZ_DATA_ERROR: - fprintf ( stderr, - "data integrity (CRC) error in data\n" ); - return False; - case BZ_MEM_ERROR: - outOfMemory(); - case BZ_UNEXPECTED_EOF: - fprintf ( stderr, - "file ends unexpectedly\n" ); - return False; - case BZ_DATA_ERROR_MAGIC: - if (zStream != stdin) fclose(zStream); - if (streamNo == 1) { - fprintf ( stderr, - "bad magic number (file not created by bzip2)\n" ); - return False; - } else { - if (noisy) - fprintf ( stderr, - "trailing garbage after EOF ignored\n" ); - return True; - } - default: - panic ( "test:unexpected error" ); - } - - panic ( "test:end" ); - return True; /*notreached*/ -} - - -/*---------------------------------------------------*/ -/*--- Error [non-] handling grunge ---*/ -/*---------------------------------------------------*/ - -/*---------------------------------------------*/ -static -void setExit ( Int32 v ) -{ - if (v > exitValue) exitValue = v; -} - - -/*---------------------------------------------*/ -static -void cadvise ( void ) -{ - if (noisy) - fprintf ( - stderr, - "\nIt is possible that the compressed file(s) have become corrupted.\n" - "You can use the -tvv option to test integrity of such files.\n\n" - "You can use the `bzip2recover' program to *attempt* to recover\n" - "data from undamaged sections of corrupted files.\n\n" - ); -} - - -/*---------------------------------------------*/ -static -void showFileNames ( void ) -{ - if (noisy) - fprintf ( - stderr, - "\tInput file = %s, output file = %s\n", - inName, outName - ); -} - - -/*---------------------------------------------*/ -static -void cleanUpAndFail ( Int32 ec ) -{ - IntNative retVal; - - if ( srcMode == SM_F2F - && opMode != OM_TEST - && deleteOutputOnInterrupt ) { - if (noisy) - fprintf ( stderr, "%s: Deleting output file %s, if it exists.\n", - progName, outName ); - if (outputHandleJustInCase != NULL) - fclose ( outputHandleJustInCase ); - retVal = remove ( outName ); - if (retVal != 0) - fprintf ( stderr, - "%s: WARNING: deletion of output file (apparently) failed.\n", - progName ); - } - if (noisy && numFileNames > 0 && numFilesProcessed < numFileNames) { - fprintf ( stderr, - "%s: WARNING: some files have not been processed:\n" - "\t%d specified on command line, %d not processed yet.\n\n", - progName, numFileNames, - numFileNames - numFilesProcessed ); - } - setExit(ec); - exit(exitValue); -} - - -/*---------------------------------------------*/ -static -void panic ( Char* s ) -{ - fprintf ( stderr, - "\n%s: PANIC -- internal consistency error:\n" - "\t%s\n" - "\tThis is a BUG. Please report it to me at:\n" - "\tjseward@acm.org\n", - progName, s ); - showFileNames(); - cleanUpAndFail( 3 ); -} - - -/*---------------------------------------------*/ -static -void crcError ( void ) -{ - fprintf ( stderr, - "\n%s: Data integrity error when decompressing.\n", - progName ); - showFileNames(); - cadvise(); - cleanUpAndFail( 2 ); -} - - -/*---------------------------------------------*/ -static -void compressedStreamEOF ( void ) -{ - fprintf ( stderr, - "\n%s: Compressed file ends unexpectedly;\n\t" - "perhaps it is corrupted? *Possible* reason follows.\n", - progName ); - perror ( progName ); - showFileNames(); - cadvise(); - cleanUpAndFail( 2 ); -} - - -/*---------------------------------------------*/ -static -void ioError ( void ) -{ - fprintf ( stderr, - "\n%s: I/O or other error, bailing out. " - "Possible reason follows.\n", - progName ); - perror ( progName ); - showFileNames(); - cleanUpAndFail( 1 ); -} - - -/*---------------------------------------------*/ -static -void mySignalCatcher ( IntNative n ) -{ - fprintf ( stderr, - "\n%s: Control-C or similar caught, quitting.\n", - progName ); - cleanUpAndFail(1); -} - - -/*---------------------------------------------*/ -static -void mySIGSEGVorSIGBUScatcher ( IntNative n ) -{ - if (opMode == OM_Z) - fprintf ( - stderr, - "\n%s: Caught a SIGSEGV or SIGBUS whilst compressing.\n" - "\n" - " Possible causes are (most likely first):\n" - " (1) This computer has unreliable memory or cache hardware\n" - " (a surprisingly common problem; try a different machine.)\n" - " (2) A bug in the compiler used to create this executable\n" - " (unlikely, if you didn't compile bzip2 yourself.)\n" - " (3) A real bug in bzip2 -- I hope this should never be the case.\n" - " The user's manual, Section 4.3, has more info on (1) and (2).\n" - " \n" - " If you suspect this is a bug in bzip2, or are unsure about (1)\n" - " or (2), feel free to report it to me at: jseward@acm.org.\n" - " Section 4.3 of the user's manual describes the info a useful\n" - " bug report should have. If the manual is available on your\n" - " system, please try and read it before mailing me. If you don't\n" - " have the manual or can't be bothered to read it, mail me anyway.\n" - "\n", - progName ); - else - fprintf ( - stderr, - "\n%s: Caught a SIGSEGV or SIGBUS whilst decompressing.\n" - "\n" - " Possible causes are (most likely first):\n" - " (1) The compressed data is corrupted, and bzip2's usual checks\n" - " failed to detect this. Try bzip2 -tvv my_file.bz2.\n" - " (2) This computer has unreliable memory or cache hardware\n" - " (a surprisingly common problem; try a different machine.)\n" - " (3) A bug in the compiler used to create this executable\n" - " (unlikely, if you didn't compile bzip2 yourself.)\n" - " (4) A real bug in bzip2 -- I hope this should never be the case.\n" - " The user's manual, Section 4.3, has more info on (2) and (3).\n" - " \n" - " If you suspect this is a bug in bzip2, or are unsure about (2)\n" - " or (3), feel free to report it to me at: jseward@acm.org.\n" - " Section 4.3 of the user's manual describes the info a useful\n" - " bug report should have. If the manual is available on your\n" - " system, please try and read it before mailing me. If you don't\n" - " have the manual or can't be bothered to read it, mail me anyway.\n" - "\n", - progName ); - - showFileNames(); - if (opMode == OM_Z) - cleanUpAndFail( 3 ); else - { cadvise(); cleanUpAndFail( 2 ); } -} - - -/*---------------------------------------------*/ -static -void outOfMemory ( void ) -{ - fprintf ( stderr, - "\n%s: couldn't allocate enough memory\n", - progName ); - showFileNames(); - cleanUpAndFail(1); -} - - -/*---------------------------------------------*/ -static -void configError ( void ) -{ - fprintf ( stderr, - "bzip2: I'm not configured correctly for this platform!\n" - "\tI require Int32, Int16 and Char to have sizes\n" - "\tof 4, 2 and 1 bytes to run properly, and they don't.\n" - "\tProbably you can fix this by defining them correctly,\n" - "\tand recompiling. Bye!\n" ); - setExit(3); - exit(exitValue); -} - - -/*---------------------------------------------------*/ -/*--- The main driver machinery ---*/ -/*---------------------------------------------------*/ - -/*---------------------------------------------*/ -static -void pad ( Char *s ) -{ - Int32 i; - if ( (Int32)strlen(s) >= longestFileName ) return; - for (i = 1; i <= longestFileName - (Int32)strlen(s); i++) - fprintf ( stderr, " " ); -} - - -/*---------------------------------------------*/ -static -void copyFileName ( Char* to, Char* from ) -{ - if ( strlen(from) > FILE_NAME_LEN-10 ) { - fprintf ( - stderr, - "bzip2: file name\n`%s'\n" - "is suspiciously (more than %d chars) long.\n" - "Try using a reasonable file name instead. Sorry! :-)\n", - from, FILE_NAME_LEN-10 - ); - setExit(1); - exit(exitValue); - } - - strncpy(to,from,FILE_NAME_LEN-10); - to[FILE_NAME_LEN-10]='\0'; -} - - -/*---------------------------------------------*/ -static -Bool fileExists ( Char* name ) -{ - FILE *tmp = fopen ( name, "rb" ); - Bool exists = (tmp != NULL); - if (tmp != NULL) fclose ( tmp ); - return exists; -} - - -/*---------------------------------------------*/ -/*-- - if in doubt, return True ---*/ -static -Bool notAStandardFile ( Char* name ) -{ - IntNative i; - struct MY_STAT statBuf; - - i = MY_LSTAT ( name, &statBuf ); - if (i != 0) return True; - if (MY_S_IFREG(statBuf.st_mode)) return False; - return True; -} - - -/*---------------------------------------------*/ -/*-- - rac 11/21/98 see if file has hard links to it ---*/ -static -Int32 countHardLinks ( Char* name ) -{ - IntNative i; - struct MY_STAT statBuf; - - i = MY_LSTAT ( name, &statBuf ); - if (i != 0) return 0; - return (statBuf.st_nlink - 1); -} - - -/*---------------------------------------------*/ -static -void copyDatePermissionsAndOwner ( Char *srcName, Char *dstName ) -{ -#if BZ_UNIX - IntNative retVal; - struct MY_STAT statBuf; - struct utimbuf uTimBuf; - - retVal = MY_LSTAT ( srcName, &statBuf ); - ERROR_IF_NOT_ZERO ( retVal ); - uTimBuf.actime = statBuf.st_atime; - uTimBuf.modtime = statBuf.st_mtime; - - retVal = chmod ( dstName, statBuf.st_mode ); - ERROR_IF_NOT_ZERO ( retVal ); - - retVal = utime ( dstName, &uTimBuf ); - ERROR_IF_NOT_ZERO ( retVal ); - - retVal = chown ( dstName, statBuf.st_uid, statBuf.st_gid ); - /* chown() will in many cases return with EPERM, which can - be safely ignored. - */ -#endif -} - - -/*---------------------------------------------*/ -static -void setInterimPermissions ( Char *dstName ) -{ -#if BZ_UNIX - IntNative retVal; - retVal = chmod ( dstName, S_IRUSR | S_IWUSR ); - ERROR_IF_NOT_ZERO ( retVal ); -#endif -} - - -/*---------------------------------------------*/ -static -Bool containsDubiousChars ( Char* name ) -{ - Bool cdc = False; - for (; *name != '\0'; name++) - if (*name == '?' || *name == '*') cdc = True; - return cdc; -} - - -/*---------------------------------------------*/ -#define BZ_N_SUFFIX_PAIRS 4 - -Char* zSuffix[BZ_N_SUFFIX_PAIRS] - = { ".bz2", ".bz", ".tbz2", ".tbz" }; -Char* unzSuffix[BZ_N_SUFFIX_PAIRS] - = { "", "", ".tar", ".tar" }; - -static -Bool hasSuffix ( Char* s, Char* suffix ) -{ - Int32 ns = strlen(s); - Int32 nx = strlen(suffix); - if (ns < nx) return False; - if (strcmp(s + ns - nx, suffix) == 0) return True; - return False; -} - -static -Bool mapSuffix ( Char* name, - Char* oldSuffix, Char* newSuffix ) -{ - if (!hasSuffix(name,oldSuffix)) return False; - name[strlen(name)-strlen(oldSuffix)] = 0; - strcat ( name, newSuffix ); - return True; -} - - -/*---------------------------------------------*/ -static -void compress ( Char *name ) -{ - FILE *inStr; - FILE *outStr; - Int32 n, i; - - deleteOutputOnInterrupt = False; - - if (name == NULL && srcMode != SM_I2O) - panic ( "compress: bad modes\n" ); - - switch (srcMode) { - case SM_I2O: - copyFileName ( inName, "(stdin)" ); - copyFileName ( outName, "(stdout)" ); - break; - case SM_F2F: - copyFileName ( inName, name ); - copyFileName ( outName, name ); - strcat ( outName, ".bz2" ); - break; - case SM_F2O: - copyFileName ( inName, name ); - copyFileName ( outName, "(stdout)" ); - break; - } - - if ( srcMode != SM_I2O && containsDubiousChars ( inName ) ) { - if (noisy) - fprintf ( stderr, "%s: There are no files matching `%s'.\n", - progName, inName ); - setExit(1); - return; - } - if ( srcMode != SM_I2O && !fileExists ( inName ) ) { - fprintf ( stderr, "%s: Can't open input file %s: %s.\n", - progName, inName, strerror(errno) ); - setExit(1); - return; - } - for (i = 0; i < BZ_N_SUFFIX_PAIRS; i++) { - if (hasSuffix(inName, zSuffix[i])) { - if (noisy) - fprintf ( stderr, - "%s: Input file %s already has %s suffix.\n", - progName, inName, zSuffix[i] ); - setExit(1); - return; - } - } - if ( srcMode == SM_F2F && !forceOverwrite && notAStandardFile ( inName )) { - if (noisy) - fprintf ( stderr, "%s: Input file %s is not a normal file.\n", - progName, inName ); - setExit(1); - return; - } - if ( srcMode == SM_F2F && !forceOverwrite && fileExists ( outName ) ) { - fprintf ( stderr, "%s: Output file %s already exists.\n", - progName, outName ); - setExit(1); - return; - } - if ( srcMode == SM_F2F && !forceOverwrite && - (n=countHardLinks ( inName )) > 0) { - fprintf ( stderr, "%s: Input file %s has %d other link%s.\n", - progName, inName, n, n > 1 ? "s" : "" ); - setExit(1); - return; - } - - switch ( srcMode ) { - - case SM_I2O: - inStr = stdin; - outStr = stdout; - if ( isatty ( fileno ( stdout ) ) ) { - fprintf ( stderr, - "%s: I won't write compressed data to a terminal.\n", - progName ); - fprintf ( stderr, "%s: For help, type: `%s --help'.\n", - progName, progName ); - setExit(1); - return; - }; - break; - - case SM_F2O: - inStr = fopen ( inName, "rb" ); - outStr = stdout; - if ( isatty ( fileno ( stdout ) ) ) { - fprintf ( stderr, - "%s: I won't write compressed data to a terminal.\n", - progName ); - fprintf ( stderr, "%s: For help, type: `%s --help'.\n", - progName, progName ); - if ( inStr != NULL ) fclose ( inStr ); - setExit(1); - return; - }; - if ( inStr == NULL ) { - fprintf ( stderr, "%s: Can't open input file %s: %s.\n", - progName, inName, strerror(errno) ); - setExit(1); - return; - }; - break; - - case SM_F2F: - inStr = fopen ( inName, "rb" ); - outStr = fopen ( outName, "wb" ); - if ( outStr == NULL) { - fprintf ( stderr, "%s: Can't create output file %s: %s.\n", - progName, outName, strerror(errno) ); - if ( inStr != NULL ) fclose ( inStr ); - setExit(1); - return; - } - if ( inStr == NULL ) { - fprintf ( stderr, "%s: Can't open input file %s: %s.\n", - progName, inName, strerror(errno) ); - if ( outStr != NULL ) fclose ( outStr ); - setExit(1); - return; - }; - setInterimPermissions ( outName ); - break; - - default: - panic ( "compress: bad srcMode" ); - break; - } - - if (verbosity >= 1) { - fprintf ( stderr, " %s: ", inName ); - pad ( inName ); - fflush ( stderr ); - } - - /*--- Now the input and output handles are sane. Do the Biz. ---*/ - outputHandleJustInCase = outStr; - deleteOutputOnInterrupt = True; - compressStream ( inStr, outStr ); - outputHandleJustInCase = NULL; - - /*--- If there was an I/O error, we won't get here. ---*/ - if ( srcMode == SM_F2F ) { - copyDatePermissionsAndOwner ( inName, outName ); - deleteOutputOnInterrupt = False; - if ( !keepInputFiles ) { - IntNative retVal = remove ( inName ); - ERROR_IF_NOT_ZERO ( retVal ); - } - } - - deleteOutputOnInterrupt = False; -} - - -/*---------------------------------------------*/ -static -void uncompress ( Char *name ) -{ - FILE *inStr; - FILE *outStr; - Int32 n, i; - Bool magicNumberOK; - Bool cantGuess; - - deleteOutputOnInterrupt = False; - - if (name == NULL && srcMode != SM_I2O) - panic ( "uncompress: bad modes\n" ); - - cantGuess = False; - switch (srcMode) { - case SM_I2O: - copyFileName ( inName, "(stdin)" ); - copyFileName ( outName, "(stdout)" ); - break; - case SM_F2F: - copyFileName ( inName, name ); - copyFileName ( outName, name ); - for (i = 0; i < BZ_N_SUFFIX_PAIRS; i++) - if (mapSuffix(outName,zSuffix[i],unzSuffix[i])) - goto zzz; - cantGuess = True; - strcat ( outName, ".out" ); - break; - case SM_F2O: - copyFileName ( inName, name ); - copyFileName ( outName, "(stdout)" ); - break; - } - - zzz: - if ( srcMode != SM_I2O && containsDubiousChars ( inName ) ) { - if (noisy) - fprintf ( stderr, "%s: There are no files matching `%s'.\n", - progName, inName ); - setExit(1); - return; - } - if ( srcMode != SM_I2O && !fileExists ( inName ) ) { - fprintf ( stderr, "%s: Can't open input file %s: %s.\n", - progName, inName, strerror(errno) ); - setExit(1); - return; - } - if ( srcMode == SM_F2F && !forceOverwrite && notAStandardFile ( inName )) { - if (noisy) - fprintf ( stderr, "%s: Input file %s is not a normal file.\n", - progName, inName ); - setExit(1); - return; - } - if ( /* srcMode == SM_F2F implied && */ cantGuess ) { - if (noisy) - fprintf ( stderr, - "%s: Can't guess original name for %s -- using %s\n", - progName, inName, outName ); - /* just a warning, no return */ - } - if ( srcMode == SM_F2F && !forceOverwrite && fileExists ( outName ) ) { - fprintf ( stderr, "%s: Output file %s already exists.\n", - progName, outName ); - setExit(1); - return; - } - if ( srcMode == SM_F2F && !forceOverwrite && - (n=countHardLinks ( inName ) ) > 0) { - fprintf ( stderr, "%s: Input file %s has %d other link%s.\n", - progName, inName, n, n > 1 ? "s" : "" ); - setExit(1); - return; - } - - switch ( srcMode ) { - - case SM_I2O: - inStr = stdin; - outStr = stdout; - if ( isatty ( fileno ( stdin ) ) ) { - fprintf ( stderr, - "%s: I won't read compressed data from a terminal.\n", - progName ); - fprintf ( stderr, "%s: For help, type: `%s --help'.\n", - progName, progName ); - setExit(1); - return; - }; - break; - - case SM_F2O: - inStr = fopen ( inName, "rb" ); - outStr = stdout; - if ( inStr == NULL ) { - fprintf ( stderr, "%s: Can't open input file %s:%s.\n", - progName, inName, strerror(errno) ); - if ( inStr != NULL ) fclose ( inStr ); - setExit(1); - return; - }; - break; - - case SM_F2F: - inStr = fopen ( inName, "rb" ); - outStr = fopen ( outName, "wb" ); - if ( outStr == NULL) { - fprintf ( stderr, "%s: Can't create output file %s: %s.\n", - progName, outName, strerror(errno) ); - if ( inStr != NULL ) fclose ( inStr ); - setExit(1); - return; - } - if ( inStr == NULL ) { - fprintf ( stderr, "%s: Can't open input file %s: %s.\n", - progName, inName, strerror(errno) ); - if ( outStr != NULL ) fclose ( outStr ); - setExit(1); - return; - }; - setInterimPermissions ( outName ); - break; - - default: - panic ( "uncompress: bad srcMode" ); - break; - } - - if (verbosity >= 1) { - fprintf ( stderr, " %s: ", inName ); - pad ( inName ); - fflush ( stderr ); - } - - /*--- Now the input and output handles are sane. Do the Biz. ---*/ - outputHandleJustInCase = outStr; - deleteOutputOnInterrupt = True; - magicNumberOK = uncompressStream ( inStr, outStr ); - outputHandleJustInCase = NULL; - - /*--- If there was an I/O error, we won't get here. ---*/ - if ( magicNumberOK ) { - if ( srcMode == SM_F2F ) { - copyDatePermissionsAndOwner ( inName, outName ); - deleteOutputOnInterrupt = False; - if ( !keepInputFiles ) { - IntNative retVal = remove ( inName ); - ERROR_IF_NOT_ZERO ( retVal ); - } - } - } else { - unzFailsExist = True; - deleteOutputOnInterrupt = False; - if ( srcMode == SM_F2F ) { - IntNative retVal = remove ( outName ); - ERROR_IF_NOT_ZERO ( retVal ); - } - } - deleteOutputOnInterrupt = False; - - if ( magicNumberOK ) { - if (verbosity >= 1) - fprintf ( stderr, "done\n" ); - } else { - setExit(2); - if (verbosity >= 1) - fprintf ( stderr, "not a bzip2 file.\n" ); else - fprintf ( stderr, - "%s: %s is not a bzip2 file.\n", - progName, inName ); - } - -} - - -/*---------------------------------------------*/ -static -void testf ( Char *name ) -{ - FILE *inStr; - Bool allOK; - - deleteOutputOnInterrupt = False; - - if (name == NULL && srcMode != SM_I2O) - panic ( "testf: bad modes\n" ); - - copyFileName ( outName, "(none)" ); - switch (srcMode) { - case SM_I2O: copyFileName ( inName, "(stdin)" ); break; - case SM_F2F: copyFileName ( inName, name ); break; - case SM_F2O: copyFileName ( inName, name ); break; - } - - if ( srcMode != SM_I2O && containsDubiousChars ( inName ) ) { - if (noisy) - fprintf ( stderr, "%s: There are no files matching `%s'.\n", - progName, inName ); - setExit(1); - return; - } - if ( srcMode != SM_I2O && !fileExists ( inName ) ) { - fprintf ( stderr, "%s: Can't open input %s: %s.\n", - progName, inName, strerror(errno) ); - setExit(1); - return; - } - - switch ( srcMode ) { - - case SM_I2O: - if ( isatty ( fileno ( stdin ) ) ) { - fprintf ( stderr, - "%s: I won't read compressed data from a terminal.\n", - progName ); - fprintf ( stderr, "%s: For help, type: `%s --help'.\n", - progName, progName ); - setExit(1); - return; - }; - inStr = stdin; - break; - - case SM_F2O: case SM_F2F: - inStr = fopen ( inName, "rb" ); - if ( inStr == NULL ) { - fprintf ( stderr, "%s: Can't open input file %s:%s.\n", - progName, inName, strerror(errno) ); - setExit(1); - return; - }; - break; - - default: - panic ( "testf: bad srcMode" ); - break; - } - - if (verbosity >= 1) { - fprintf ( stderr, " %s: ", inName ); - pad ( inName ); - fflush ( stderr ); - } - - /*--- Now the input handle is sane. Do the Biz. ---*/ - allOK = testStream ( inStr ); - - if (allOK && verbosity >= 1) fprintf ( stderr, "ok\n" ); - if (!allOK) testFailsExist = True; -} - - -/*---------------------------------------------*/ -static -void license ( void ) -{ - fprintf ( stderr, - - "bzip2, a block-sorting file compressor. " - "Version %s.\n" - " \n" - " Copyright (C) 1996-2000 by Julian Seward.\n" - " \n" - " This program is free software; you can redistribute it and/or modify\n" - " it under the terms set out in the LICENSE file, which is included\n" - " in the bzip2-1.0 source distribution.\n" - " \n" - " This program is distributed in the hope that it will be useful,\n" - " but WITHOUT ANY WARRANTY; without even the implied warranty of\n" - " MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n" - " LICENSE file for more details.\n" - " \n", - BZ2_bzlibVersion() - ); -} - - -/*---------------------------------------------*/ -static -void usage ( Char *fullProgName ) -{ - fprintf ( - stderr, - "bzip2, a block-sorting file compressor. " - "Version %s.\n" - "\n usage: %s [flags and input files in any order]\n" - "\n" - " -h --help print this message\n" - " -d --decompress force decompression\n" - " -z --compress force compression\n" - " -k --keep keep (don't delete) input files\n" - " -f --force overwrite existing output files\n" - " -t --test test compressed file integrity\n" - " -c --stdout output to standard out\n" - " -q --quiet suppress noncritical error messages\n" - " -v --verbose be verbose (a 2nd -v gives more)\n" - " -L --license display software version & license\n" - " -V --version display software version & license\n" - " -s --small use less memory (at most 2500k)\n" - " -1 .. -9 set block size to 100k .. 900k\n" - "\n" - " If invoked as `bzip2', default action is to compress.\n" - " as `bunzip2', default action is to decompress.\n" - " as `bzcat', default action is to decompress to stdout.\n" - "\n" - " If no file names are given, bzip2 compresses or decompresses\n" - " from standard input to standard output. You can combine\n" - " short flags, so `-v -4' means the same as -v4 or -4v, &c.\n" -#if BZ_UNIX - "\n" -#endif - , - - BZ2_bzlibVersion(), - fullProgName - ); -} - - -/*---------------------------------------------*/ -static -void redundant ( Char* flag ) -{ - fprintf ( - stderr, - "%s: %s is redundant in versions 0.9.5 and above\n", - progName, flag ); -} - - -/*---------------------------------------------*/ -/*-- - All the garbage from here to main() is purely to - implement a linked list of command-line arguments, - into which main() copies argv[1 .. argc-1]. - - The purpose of this exercise is to facilitate - the expansion of wildcard characters * and ? in - filenames for OSs which don't know how to do it - themselves, like MSDOS, Windows 95 and NT. - - The actual Dirty Work is done by the platform- - specific macro APPEND_FILESPEC. ---*/ - -typedef - struct zzzz { - Char *name; - struct zzzz *link; - } - Cell; - - -/*---------------------------------------------*/ -static -void *myMalloc ( Int32 n ) -{ - void* p; - - p = malloc ( (size_t)n ); - if (p == NULL) outOfMemory (); - return p; -} - - -/*---------------------------------------------*/ -static -Cell *mkCell ( void ) -{ - Cell *c; - - c = (Cell*) myMalloc ( sizeof ( Cell ) ); - c->name = NULL; - c->link = NULL; - return c; -} - - -/*---------------------------------------------*/ -static -Cell *snocString ( Cell *root, Char *name ) -{ - if (root == NULL) { - Cell *tmp = mkCell(); - tmp->name = (Char*) myMalloc ( 5 + strlen(name) ); - strcpy ( tmp->name, name ); - return tmp; - } else { - Cell *tmp = root; - while (tmp->link != NULL) tmp = tmp->link; - tmp->link = snocString ( tmp->link, name ); - return root; - } -} - - -/*---------------------------------------------*/ -static -void addFlagsFromEnvVar ( Cell** argList, Char* varName ) -{ - Int32 i, j, k; - Char *envbase, *p; - - envbase = getenv(varName); - if (envbase != NULL) { - p = envbase; - i = 0; - while (True) { - if (p[i] == 0) break; - p += i; - i = 0; - while (isspace((Int32)(p[0]))) p++; - while (p[i] != 0 && !isspace((Int32)(p[i]))) i++; - if (i > 0) { - k = i; if (k > FILE_NAME_LEN-10) k = FILE_NAME_LEN-10; - for (j = 0; j < k; j++) tmpName[j] = p[j]; - tmpName[k] = 0; - APPEND_FLAG(*argList, tmpName); - } - } - } -} - - -/*---------------------------------------------*/ -#define ISFLAG(s) (strcmp(aa->name, (s))==0) - -IntNative main ( IntNative argc, Char *argv[] ) -{ - Int32 i, j; - Char *tmp; - Cell *argList; - Cell *aa; - Bool decode; - - /*-- Be really really really paranoid :-) --*/ - if (sizeof(Int32) != 4 || sizeof(UInt32) != 4 || - sizeof(Int16) != 2 || sizeof(UInt16) != 2 || - sizeof(Char) != 1 || sizeof(UChar) != 1) - configError(); - - /*-- Initialise --*/ - outputHandleJustInCase = NULL; - smallMode = False; - keepInputFiles = False; - forceOverwrite = False; - noisy = True; - verbosity = 0; - blockSize100k = 9; - testFailsExist = False; - unzFailsExist = False; - numFileNames = 0; - numFilesProcessed = 0; - workFactor = 30; - deleteOutputOnInterrupt = False; - exitValue = 0; - i = j = 0; /* avoid bogus warning from egcs-1.1.X */ - - /*-- Set up signal handlers for mem access errors --*/ - signal (SIGSEGV, mySIGSEGVorSIGBUScatcher); -#if BZ_UNIX -#ifndef __DJGPP__ - signal (SIGBUS, mySIGSEGVorSIGBUScatcher); -#endif -#endif - - copyFileName ( inName, "(none)" ); - copyFileName ( outName, "(none)" ); - - copyFileName ( progNameReally, argv[0] ); - progName = &progNameReally[0]; - for (tmp = &progNameReally[0]; *tmp != '\0'; tmp++) - if (*tmp == PATH_SEP) progName = tmp + 1; - - - /*-- Copy flags from env var BZIP2, and - expand filename wildcards in arg list. - --*/ - argList = NULL; - addFlagsFromEnvVar ( &argList, "BZIP2" ); - addFlagsFromEnvVar ( &argList, "BZIP" ); - for (i = 1; i <= argc-1; i++) - APPEND_FILESPEC(argList, argv[i]); - - - /*-- Find the length of the longest filename --*/ - longestFileName = 7; - numFileNames = 0; - decode = True; - for (aa = argList; aa != NULL; aa = aa->link) { - if (ISFLAG("--")) { decode = False; continue; } - if (aa->name[0] == '-' && decode) continue; - numFileNames++; - if (longestFileName < (Int32)strlen(aa->name) ) - longestFileName = (Int32)strlen(aa->name); - } - - - /*-- Determine source modes; flag handling may change this too. --*/ - if (numFileNames == 0) - srcMode = SM_I2O; else srcMode = SM_F2F; - - - /*-- Determine what to do (compress/uncompress/test/cat). --*/ - /*-- Note that subsequent flag handling may change this. --*/ - opMode = OM_Z; - - if ( (strstr ( progName, "unzip" ) != 0) || - (strstr ( progName, "UNZIP" ) != 0) ) - opMode = OM_UNZ; - - if ( (strstr ( progName, "z2cat" ) != 0) || - (strstr ( progName, "Z2CAT" ) != 0) || - (strstr ( progName, "zcat" ) != 0) || - (strstr ( progName, "ZCAT" ) != 0) ) { - opMode = OM_UNZ; - srcMode = (numFileNames == 0) ? SM_I2O : SM_F2O; - } - - - /*-- Look at the flags. --*/ - for (aa = argList; aa != NULL; aa = aa->link) { - if (ISFLAG("--")) break; - if (aa->name[0] == '-' && aa->name[1] != '-') { - for (j = 1; aa->name[j] != '\0'; j++) { - switch (aa->name[j]) { - case 'c': srcMode = SM_F2O; break; - case 'd': opMode = OM_UNZ; break; - case 'z': opMode = OM_Z; break; - case 'f': forceOverwrite = True; break; - case 't': opMode = OM_TEST; break; - case 'k': keepInputFiles = True; break; - case 's': smallMode = True; break; - case 'q': noisy = False; break; - case '1': blockSize100k = 1; break; - case '2': blockSize100k = 2; break; - case '3': blockSize100k = 3; break; - case '4': blockSize100k = 4; break; - case '5': blockSize100k = 5; break; - case '6': blockSize100k = 6; break; - case '7': blockSize100k = 7; break; - case '8': blockSize100k = 8; break; - case '9': blockSize100k = 9; break; - case 'V': - case 'L': license(); break; - case 'v': verbosity++; break; - case 'h': usage ( progName ); - exit ( 0 ); - break; - default: fprintf ( stderr, "%s: Bad flag `%s'\n", - progName, aa->name ); - usage ( progName ); - exit ( 1 ); - break; - } - } - } - } - - /*-- And again ... --*/ - for (aa = argList; aa != NULL; aa = aa->link) { - if (ISFLAG("--")) break; - if (ISFLAG("--stdout")) srcMode = SM_F2O; else - if (ISFLAG("--decompress")) opMode = OM_UNZ; else - if (ISFLAG("--compress")) opMode = OM_Z; else - if (ISFLAG("--force")) forceOverwrite = True; else - if (ISFLAG("--test")) opMode = OM_TEST; else - if (ISFLAG("--keep")) keepInputFiles = True; else - if (ISFLAG("--small")) smallMode = True; else - if (ISFLAG("--quiet")) noisy = False; else - if (ISFLAG("--version")) license(); else - if (ISFLAG("--license")) license(); else - if (ISFLAG("--exponential")) workFactor = 1; else - if (ISFLAG("--repetitive-best")) redundant(aa->name); else - if (ISFLAG("--repetitive-fast")) redundant(aa->name); else - if (ISFLAG("--verbose")) verbosity++; else - if (ISFLAG("--help")) { usage ( progName ); exit ( 0 ); } - else - if (strncmp ( aa->name, "--", 2) == 0) { - fprintf ( stderr, "%s: Bad flag `%s'\n", progName, aa->name ); - usage ( progName ); - exit ( 1 ); - } - } - - if (verbosity > 4) verbosity = 4; - if (opMode == OM_Z && smallMode && blockSize100k > 2) - blockSize100k = 2; - - if (opMode == OM_TEST && srcMode == SM_F2O) { - fprintf ( stderr, "%s: -c and -t cannot be used together.\n", - progName ); - exit ( 1 ); - } - - if (srcMode == SM_F2O && numFileNames == 0) - srcMode = SM_I2O; - - if (opMode != OM_Z) blockSize100k = 0; - - if (srcMode == SM_F2F) { - signal (SIGINT, mySignalCatcher); - signal (SIGTERM, mySignalCatcher); -# if BZ_UNIX - signal (SIGHUP, mySignalCatcher); -# endif - } - - if (opMode == OM_Z) { - if (srcMode == SM_I2O) { - compress ( NULL ); - } else { - decode = True; - for (aa = argList; aa != NULL; aa = aa->link) { - if (ISFLAG("--")) { decode = False; continue; } - if (aa->name[0] == '-' && decode) continue; - numFilesProcessed++; - compress ( aa->name ); - } - } - } - else - - if (opMode == OM_UNZ) { - unzFailsExist = False; - if (srcMode == SM_I2O) { - uncompress ( NULL ); - } else { - decode = True; - for (aa = argList; aa != NULL; aa = aa->link) { - if (ISFLAG("--")) { decode = False; continue; } - if (aa->name[0] == '-' && decode) continue; - numFilesProcessed++; - uncompress ( aa->name ); - } - } - if (unzFailsExist) { - setExit(2); - exit(exitValue); - } - } - - else { - testFailsExist = False; - if (srcMode == SM_I2O) { - testf ( NULL ); - } else { - decode = True; - for (aa = argList; aa != NULL; aa = aa->link) { - if (ISFLAG("--")) { decode = False; continue; } - if (aa->name[0] == '-' && decode) continue; - numFilesProcessed++; - testf ( aa->name ); - } - } - if (testFailsExist && noisy) { - fprintf ( stderr, - "\n" - "You can use the `bzip2recover' program to attempt to recover\n" - "data from undamaged sections of corrupted files.\n\n" - ); - setExit(2); - exit(exitValue); - } - } - - /* Free the argument list memory to mollify leak detectors - (eg) Purify, Checker. Serves no other useful purpose. - */ - aa = argList; - while (aa != NULL) { - Cell* aa2 = aa->link; - if (aa->name != NULL) free(aa->name); - free(aa); - aa = aa2; - } - - return exitValue; -} - - -/*-----------------------------------------------------------*/ -/*--- end bzip2.c ---*/ -/*-----------------------------------------------------------*/ diff --git a/winsup/bz2lib/bzip2.txt b/winsup/bz2lib/bzip2.txt deleted file mode 100644 index 4f1ae86..0000000 --- a/winsup/bz2lib/bzip2.txt +++ /dev/null @@ -1,376 +0,0 @@ - - -NAME - bzip2, bunzip2 - a block-sorting file compressor, v1.0 - bzcat - decompresses files to stdout - bzip2recover - recovers data from damaged bzip2 files - - -SYNOPSIS - bzip2 [ -cdfkqstvzVL123456789 ] [ filenames ... ] - bunzip2 [ -fkvsVL ] [ filenames ... ] - bzcat [ -s ] [ filenames ... ] - bzip2recover filename - - -DESCRIPTION - bzip2 compresses files using the Burrows-Wheeler block - sorting text compression algorithm, and Huffman coding. - Compression is generally considerably better than that - achieved by more conventional LZ77/LZ78-based compressors, - and approaches the performance of the PPM family of sta- - tistical compressors. - - The command-line options are deliberately very similar to - those of GNU gzip, but they are not identical. - - bzip2 expects a list of file names to accompany the com- - mand-line flags. Each file is replaced by a compressed - version of itself, with the name "original_name.bz2". - Each compressed file has the same modification date, per- - missions, and, when possible, ownership as the correspond- - ing original, so that these properties can be correctly - restored at decompression time. File name handling is - naive in the sense that there is no mechanism for preserv- - ing original file names, permissions, ownerships or dates - in filesystems which lack these concepts, or have serious - file name length restrictions, such as MS-DOS. - - bzip2 and bunzip2 will by default not overwrite existing - files. If you want this to happen, specify the -f flag. - - If no file names are specified, bzip2 compresses from - standard input to standard output. In this case, bzip2 - will decline to write compressed output to a terminal, as - this would be entirely incomprehensible and therefore - pointless. - - bunzip2 (or bzip2 -d) decompresses all specified files. - Files which were not created by bzip2 will be detected and - ignored, and a warning issued. bzip2 attempts to guess - the filename for the decompressed file from that of the - compressed file as follows: - - filename.bz2 becomes filename - filename.bz becomes filename - filename.tbz2 becomes filename.tar - filename.tbz becomes filename.tar - anyothername becomes anyothername.out - - If the file does not end in one of the recognised endings, - .bz2, .bz, .tbz2 or .tbz, bzip2 complains that it cannot - guess the name of the original file, and uses the original - name with .out appended. - - As with compression, supplying no filenames causes decom- - pression from standard input to standard output. - - bunzip2 will correctly decompress a file which is the con- - catenation of two or more compressed files. The result is - the concatenation of the corresponding uncompressed files. - Integrity testing (-t) of concatenated compressed files is - also supported. - - You can also compress or decompress files to the standard - output by giving the -c flag. Multiple files may be com- - pressed and decompressed like this. The resulting outputs - are fed sequentially to stdout. Compression of multiple - files in this manner generates a stream containing multi- - ple compressed file representations. Such a stream can be - decompressed correctly only by bzip2 version 0.9.0 or - later. Earlier versions of bzip2 will stop after decom- - pressing the first file in the stream. - - bzcat (or bzip2 -dc) decompresses all specified files to - the standard output. - - bzip2 will read arguments from the environment variables - BZIP2 and BZIP, in that order, and will process them - before any arguments read from the command line. This - gives a convenient way to supply default arguments. - - Compression is always performed, even if the compressed - file is slightly larger than the original. Files of less - than about one hundred bytes tend to get larger, since the - compression mechanism has a constant overhead in the - region of 50 bytes. Random data (including the output of - most file compressors) is coded at about 8.05 bits per - byte, giving an expansion of around 0.5%. - - As a self-check for your protection, bzip2 uses 32-bit - CRCs to make sure that the decompressed version of a file - is identical to the original. This guards against corrup- - tion of the compressed data, and against undetected bugs - in bzip2 (hopefully very unlikely). The chances of data - corruption going undetected is microscopic, about one - chance in four billion for each file processed. Be aware, - though, that the check occurs upon decompression, so it - can only tell you that something is wrong. It can't help - you recover the original uncompressed data. You can use - bzip2recover to try to recover data from damaged files. - - Return values: 0 for a normal exit, 1 for environmental - problems (file not found, invalid flags, I/O errors, &c), - 2 to indicate a corrupt compressed file, 3 for an internal - consistency error (eg, bug) which caused bzip2 to panic. - - -OPTIONS - -c --stdout - Compress or decompress to standard output. - - -d --decompress - Force decompression. bzip2, bunzip2 and bzcat are - really the same program, and the decision about - what actions to take is done on the basis of which - name is used. This flag overrides that mechanism, - and forces bzip2 to decompress. - - -z --compress - The complement to -d: forces compression, regard- - less of the invokation name. - - -t --test - Check integrity of the specified file(s), but don't - decompress them. This really performs a trial - decompression and throws away the result. - - -f --force - Force overwrite of output files. Normally, bzip2 - will not overwrite existing output files. Also - forces bzip2 to break hard links to files, which it - otherwise wouldn't do. - - -k --keep - Keep (don't delete) input files during compression - or decompression. - - -s --small - Reduce memory usage, for compression, decompression - and testing. Files are decompressed and tested - using a modified algorithm which only requires 2.5 - bytes per block byte. This means any file can be - decompressed in 2300k of memory, albeit at about - half the normal speed. - - During compression, -s selects a block size of - 200k, which limits memory use to around the same - figure, at the expense of your compression ratio. - In short, if your machine is low on memory (8 - megabytes or less), use -s for everything. See - MEMORY MANAGEMENT below. - - -q --quiet - Suppress non-essential warning messages. Messages - pertaining to I/O errors and other critical events - will not be suppressed. - - -v --verbose - Verbose mode -- show the compression ratio for each - file processed. Further -v's increase the ver- - bosity level, spewing out lots of information which - is primarily of interest for diagnostic purposes. - - -L --license -V --version - Display the software version, license terms and - conditions. - - -1 to -9 - Set the block size to 100 k, 200 k .. 900 k when - compressing. Has no effect when decompressing. - See MEMORY MANAGEMENT below. - - -- Treats all subsequent arguments as file names, even - if they start with a dash. This is so you can han- - dle files with names beginning with a dash, for - example: bzip2 -- -myfilename. - - --repetitive-fast --repetitive-best - These flags are redundant in versions 0.9.5 and - above. They provided some coarse control over the - behaviour of the sorting algorithm in earlier ver- - sions, which was sometimes useful. 0.9.5 and above - have an improved algorithm which renders these - flags irrelevant. - - -MEMORY MANAGEMENT - bzip2 compresses large files in blocks. The block size - affects both the compression ratio achieved, and the - amount of memory needed for compression and decompression. - The flags -1 through -9 specify the block size to be - 100,000 bytes through 900,000 bytes (the default) respec- - tively. At decompression time, the block size used for - compression is read from the header of the compressed - file, and bunzip2 then allocates itself just enough memory - to decompress the file. Since block sizes are stored in - compressed files, it follows that the flags -1 to -9 are - irrelevant to and so ignored during decompression. - - Compression and decompression requirements, in bytes, can - be estimated as: - - Compression: 400k + ( 8 x block size ) - - Decompression: 100k + ( 4 x block size ), or - 100k + ( 2.5 x block size ) - - Larger block sizes give rapidly diminishing marginal - returns. Most of the compression comes from the first two - or three hundred k of block size, a fact worth bearing in - mind when using bzip2 on small machines. It is also - important to appreciate that the decompression memory - requirement is set at compression time by the choice of - block size. - - For files compressed with the default 900k block size, - bunzip2 will require about 3700 kbytes to decompress. To - support decompression of any file on a 4 megabyte machine, - bunzip2 has an option to decompress using approximately - half this amount of memory, about 2300 kbytes. Decompres- - sion speed is also halved, so you should use this option - only where necessary. The relevant flag is -s. - - In general, try and use the largest block size memory con- - straints allow, since that maximises the compression - achieved. Compression and decompression speed are virtu- - ally unaffected by block size. - - Another significant point applies to files which fit in a - single block -- that means most files you'd encounter - using a large block size. The amount of real memory - touched is proportional to the size of the file, since the - file is smaller than a block. For example, compressing a - file 20,000 bytes long with the flag -9 will cause the - compressor to allocate around 7600k of memory, but only - touch 400k + 20000 * 8 = 560 kbytes of it. Similarly, the - decompressor will allocate 3700k but only touch 100k + - 20000 * 4 = 180 kbytes. - - Here is a table which summarises the maximum memory usage - for different block sizes. Also recorded is the total - compressed size for 14 files of the Calgary Text Compres- - sion Corpus totalling 3,141,622 bytes. This column gives - some feel for how compression varies with block size. - These figures tend to understate the advantage of larger - block sizes for larger files, since the Corpus is domi- - nated by smaller files. - - Compress Decompress Decompress Corpus - Flag usage usage -s usage Size - - -1 1200k 500k 350k 914704 - -2 2000k 900k 600k 877703 - -3 2800k 1300k 850k 860338 - -4 3600k 1700k 1100k 846899 - -5 4400k 2100k 1350k 845160 - -6 5200k 2500k 1600k 838626 - -7 6100k 2900k 1850k 834096 - -8 6800k 3300k 2100k 828642 - -9 7600k 3700k 2350k 828642 - - -RECOVERING DATA FROM DAMAGED FILES - bzip2 compresses files in blocks, usually 900kbytes long. - Each block is handled independently. If a media or trans- - mission error causes a multi-block .bz2 file to become - damaged, it may be possible to recover data from the - undamaged blocks in the file. - - The compressed representation of each block is delimited - by a 48-bit pattern, which makes it possible to find the - block boundaries with reasonable certainty. Each block - also carries its own 32-bit CRC, so damaged blocks can be - distinguished from undamaged ones. - - bzip2recover is a simple program whose purpose is to - search for blocks in .bz2 files, and write each block out - into its own .bz2 file. You can then use bzip2 -t to test - the integrity of the resulting files, and decompress those - which are undamaged. - - bzip2recover takes a single argument, the name of the dam- - aged file, and writes a number of files "rec0001file.bz2", - "rec0002file.bz2", etc, containing the extracted blocks. - The output filenames are designed so that the use of - wildcards in subsequent processing -- for example, "bzip2 - -dc rec*file.bz2 > recovered_data" -- lists the files in - the correct order. - - bzip2recover should be of most use dealing with large .bz2 - files, as these will contain many blocks. It is clearly - futile to use it on damaged single-block files, since a - damaged block cannot be recovered. If you wish to min- - imise any potential data loss through media or transmis- - sion errors, you might consider compressing with a smaller - block size. - - -PERFORMANCE NOTES - The sorting phase of compression gathers together similar - strings in the file. Because of this, files containing - very long runs of repeated symbols, like "aabaabaabaab - ..." (repeated several hundred times) may compress more - slowly than normal. Versions 0.9.5 and above fare much - better than previous versions in this respect. The ratio - between worst-case and average-case compression time is in - the region of 10:1. For previous versions, this figure - was more like 100:1. You can use the -vvvv option to mon- - itor progress in great detail, if you want. - - Decompression speed is unaffected by these phenomena. - - bzip2 usually allocates several megabytes of memory to - operate in, and then charges all over it in a fairly ran- - dom fashion. This means that performance, both for com- - pressing and decompressing, is largely determined by the - speed at which your machine can service cache misses. - Because of this, small changes to the code to reduce the - miss rate have been observed to give disproportionately - large performance improvements. I imagine bzip2 will per- - form best on machines with very large caches. - - -CAVEATS - I/O error messages are not as helpful as they could be. - bzip2 tries hard to detect I/O errors and exit cleanly, - but the details of what the problem is sometimes seem - rather misleading. - - This manual page pertains to version 1.0 of bzip2. Com- - pressed data created by this version is entirely forwards - and backwards compatible with the previous public - releases, versions 0.1pl2, 0.9.0 and 0.9.5, but with the - following exception: 0.9.0 and above can correctly decom- - press multiple concatenated compressed files. 0.1pl2 can- - not do this; it will stop after decompressing just the - first file in the stream. - - bzip2recover uses 32-bit integers to represent bit posi- - tions in compressed files, so it cannot handle compressed - files more than 512 megabytes long. This could easily be - fixed. - - -AUTHOR - Julian Seward, jseward@acm.org. - - http://sourceware.cygnus.com/bzip2 - http://www.muraroa.demon.co.uk - - The ideas embodied in bzip2 are due to (at least) the fol- - lowing people: Michael Burrows and David Wheeler (for the - block sorting transformation), David Wheeler (again, for - the Huffman coder), Peter Fenwick (for the structured cod- - ing model in the original bzip, and many refinements), and - Alistair Moffat, Radford Neal and Ian Witten (for the - arithmetic coder in the original bzip). I am much - indebted for their help, support and advice. See the man- - ual in the source distribution for pointers to sources of - documentation. Christian von Roques encouraged me to look - for faster sorting algorithms, so as to speed up compres- - sion. Bela Lubkin encouraged me to improve the worst-case - compression performance. Many people sent patches, helped - with portability problems, lent machines, gave advice and - were generally helpful. - diff --git a/winsup/bz2lib/bzip2recover.c b/winsup/bz2lib/bzip2recover.c deleted file mode 100644 index ba3d175..0000000 --- a/winsup/bz2lib/bzip2recover.c +++ /dev/null @@ -1,435 +0,0 @@ - -/*-----------------------------------------------------------*/ -/*--- Block recoverer program for bzip2 ---*/ -/*--- bzip2recover.c ---*/ -/*-----------------------------------------------------------*/ - -/*-- - This program is bzip2recover, a program to attempt data - salvage from damaged files created by the accompanying - bzip2-1.0 program. - - Copyright (C) 1996-2000 Julian R Seward. All rights reserved. - - Redistribution and use in source and binary forms, with or without - modification, are permitted provided that the following conditions - are met: - - 1. Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - - 2. The origin of this software must not be misrepresented; you must - not claim that you wrote the original software. If you use this - software in a product, an acknowledgment in the product - documentation would be appreciated but is not required. - - 3. Altered source versions must be plainly marked as such, and must - not be misrepresented as being the original software. - - 4. The name of the author may not be used to endorse or promote - products derived from this software without specific prior written - permission. - - THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS - OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED - WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY - DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE - GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS - INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, - WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING - NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS - SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - - Julian Seward, Cambridge, UK. - jseward@acm.org - bzip2/libbzip2 version 1.0 of 21 March 2000 ---*/ - -/*-- - This program is a complete hack and should be rewritten - properly. It isn't very complicated. ---*/ - -#include <stdio.h> -#include <errno.h> -#include <stdlib.h> -#include <string.h> - -typedef unsigned int UInt32; -typedef int Int32; -typedef unsigned char UChar; -typedef char Char; -typedef unsigned char Bool; -#define True ((Bool)1) -#define False ((Bool)0) - - -Char inFileName[2000]; -Char outFileName[2000]; -Char progName[2000]; - -UInt32 bytesOut = 0; -UInt32 bytesIn = 0; - - -/*---------------------------------------------------*/ -/*--- I/O errors ---*/ -/*---------------------------------------------------*/ - -/*---------------------------------------------*/ -void readError ( void ) -{ - fprintf ( stderr, - "%s: I/O error reading `%s', possible reason follows.\n", - progName, inFileName ); - perror ( progName ); - fprintf ( stderr, "%s: warning: output file(s) may be incomplete.\n", - progName ); - exit ( 1 ); -} - - -/*---------------------------------------------*/ -void writeError ( void ) -{ - fprintf ( stderr, - "%s: I/O error reading `%s', possible reason follows.\n", - progName, inFileName ); - perror ( progName ); - fprintf ( stderr, "%s: warning: output file(s) may be incomplete.\n", - progName ); - exit ( 1 ); -} - - -/*---------------------------------------------*/ -void mallocFail ( Int32 n ) -{ - fprintf ( stderr, - "%s: malloc failed on request for %d bytes.\n", - progName, n ); - fprintf ( stderr, "%s: warning: output file(s) may be incomplete.\n", - progName ); - exit ( 1 ); -} - - -/*---------------------------------------------------*/ -/*--- Bit stream I/O ---*/ -/*---------------------------------------------------*/ - -typedef - struct { - FILE* handle; - Int32 buffer; - Int32 buffLive; - Char mode; - } - BitStream; - - -/*---------------------------------------------*/ -BitStream* bsOpenReadStream ( FILE* stream ) -{ - BitStream *bs = malloc ( sizeof(BitStream) ); - if (bs == NULL) mallocFail ( sizeof(BitStream) ); - bs->handle = stream; - bs->buffer = 0; - bs->buffLive = 0; - bs->mode = 'r'; - return bs; -} - - -/*---------------------------------------------*/ -BitStream* bsOpenWriteStream ( FILE* stream ) -{ - BitStream *bs = malloc ( sizeof(BitStream) ); - if (bs == NULL) mallocFail ( sizeof(BitStream) ); - bs->handle = stream; - bs->buffer = 0; - bs->buffLive = 0; - bs->mode = 'w'; - return bs; -} - - -/*---------------------------------------------*/ -void bsPutBit ( BitStream* bs, Int32 bit ) -{ - if (bs->buffLive == 8) { - Int32 retVal = putc ( (UChar) bs->buffer, bs->handle ); - if (retVal == EOF) writeError(); - bytesOut++; - bs->buffLive = 1; - bs->buffer = bit & 0x1; - } else { - bs->buffer = ( (bs->buffer << 1) | (bit & 0x1) ); - bs->buffLive++; - }; -} - - -/*---------------------------------------------*/ -/*-- - Returns 0 or 1, or 2 to indicate EOF. ---*/ -Int32 bsGetBit ( BitStream* bs ) -{ - if (bs->buffLive > 0) { - bs->buffLive --; - return ( ((bs->buffer) >> (bs->buffLive)) & 0x1 ); - } else { - Int32 retVal = getc ( bs->handle ); - if ( retVal == EOF ) { - if (errno != 0) readError(); - return 2; - } - bs->buffLive = 7; - bs->buffer = retVal; - return ( ((bs->buffer) >> 7) & 0x1 ); - } -} - - -/*---------------------------------------------*/ -void bsClose ( BitStream* bs ) -{ - Int32 retVal; - - if ( bs->mode == 'w' ) { - while ( bs->buffLive < 8 ) { - bs->buffLive++; - bs->buffer <<= 1; - }; - retVal = putc ( (UChar) (bs->buffer), bs->handle ); - if (retVal == EOF) writeError(); - bytesOut++; - retVal = fflush ( bs->handle ); - if (retVal == EOF) writeError(); - } - retVal = fclose ( bs->handle ); - if (retVal == EOF) { - if (bs->mode == 'w') writeError(); else readError(); - } - free ( bs ); -} - - -/*---------------------------------------------*/ -void bsPutUChar ( BitStream* bs, UChar c ) -{ - Int32 i; - for (i = 7; i >= 0; i--) - bsPutBit ( bs, (((UInt32) c) >> i) & 0x1 ); -} - - -/*---------------------------------------------*/ -void bsPutUInt32 ( BitStream* bs, UInt32 c ) -{ - Int32 i; - - for (i = 31; i >= 0; i--) - bsPutBit ( bs, (c >> i) & 0x1 ); -} - - -/*---------------------------------------------*/ -Bool endsInBz2 ( Char* name ) -{ - Int32 n = strlen ( name ); - if (n <= 4) return False; - return - (name[n-4] == '.' && - name[n-3] == 'b' && - name[n-2] == 'z' && - name[n-1] == '2'); -} - - -/*---------------------------------------------------*/ -/*--- ---*/ -/*---------------------------------------------------*/ - -#define BLOCK_HEADER_HI 0x00003141UL -#define BLOCK_HEADER_LO 0x59265359UL - -#define BLOCK_ENDMARK_HI 0x00001772UL -#define BLOCK_ENDMARK_LO 0x45385090UL - - -UInt32 bStart[20000]; -UInt32 bEnd[20000]; -UInt32 rbStart[20000]; -UInt32 rbEnd[20000]; - -Int32 main ( Int32 argc, Char** argv ) -{ - FILE* inFile; - FILE* outFile; - BitStream* bsIn, *bsWr; - Int32 currBlock, b, wrBlock; - UInt32 bitsRead; - Int32 rbCtr; - - - UInt32 buffHi, buffLo, blockCRC; - Char* p; - - strcpy ( progName, argv[0] ); - inFileName[0] = outFileName[0] = 0; - - fprintf ( stderr, "bzip2recover 1.0: extracts blocks from damaged .bz2 files.\n" ); - - if (argc != 2) { - fprintf ( stderr, "%s: usage is `%s damaged_file_name'.\n", - progName, progName ); - exit(1); - } - - strcpy ( inFileName, argv[1] ); - - inFile = fopen ( inFileName, "rb" ); - if (inFile == NULL) { - fprintf ( stderr, "%s: can't read `%s'\n", progName, inFileName ); - exit(1); - } - - bsIn = bsOpenReadStream ( inFile ); - fprintf ( stderr, "%s: searching for block boundaries ...\n", progName ); - - bitsRead = 0; - buffHi = buffLo = 0; - currBlock = 0; - bStart[currBlock] = 0; - - rbCtr = 0; - - while (True) { - b = bsGetBit ( bsIn ); - bitsRead++; - if (b == 2) { - if (bitsRead >= bStart[currBlock] && - (bitsRead - bStart[currBlock]) >= 40) { - bEnd[currBlock] = bitsRead-1; - if (currBlock > 0) - fprintf ( stderr, " block %d runs from %d to %d (incomplete)\n", - currBlock, bStart[currBlock], bEnd[currBlock] ); - } else - currBlock--; - break; - } - buffHi = (buffHi << 1) | (buffLo >> 31); - buffLo = (buffLo << 1) | (b & 1); - if ( ( (buffHi & 0x0000ffff) == BLOCK_HEADER_HI - && buffLo == BLOCK_HEADER_LO) - || - ( (buffHi & 0x0000ffff) == BLOCK_ENDMARK_HI - && buffLo == BLOCK_ENDMARK_LO) - ) { - if (bitsRead > 49) - bEnd[currBlock] = bitsRead-49; else - bEnd[currBlock] = 0; - if (currBlock > 0 && - (bEnd[currBlock] - bStart[currBlock]) >= 130) { - fprintf ( stderr, " block %d runs from %d to %d\n", - rbCtr+1, bStart[currBlock], bEnd[currBlock] ); - rbStart[rbCtr] = bStart[currBlock]; - rbEnd[rbCtr] = bEnd[currBlock]; - rbCtr++; - } - currBlock++; - - bStart[currBlock] = bitsRead; - } - } - - bsClose ( bsIn ); - - /*-- identified blocks run from 1 to rbCtr inclusive. --*/ - - if (rbCtr < 1) { - fprintf ( stderr, - "%s: sorry, I couldn't find any block boundaries.\n", - progName ); - exit(1); - }; - - fprintf ( stderr, "%s: splitting into blocks\n", progName ); - - inFile = fopen ( inFileName, "rb" ); - if (inFile == NULL) { - fprintf ( stderr, "%s: can't open `%s'\n", progName, inFileName ); - exit(1); - } - bsIn = bsOpenReadStream ( inFile ); - - /*-- placate gcc's dataflow analyser --*/ - blockCRC = 0; bsWr = 0; - - bitsRead = 0; - outFile = NULL; - wrBlock = 0; - while (True) { - b = bsGetBit(bsIn); - if (b == 2) break; - buffHi = (buffHi << 1) | (buffLo >> 31); - buffLo = (buffLo << 1) | (b & 1); - if (bitsRead == 47+rbStart[wrBlock]) - blockCRC = (buffHi << 16) | (buffLo >> 16); - - if (outFile != NULL && bitsRead >= rbStart[wrBlock] - && bitsRead <= rbEnd[wrBlock]) { - bsPutBit ( bsWr, b ); - } - - bitsRead++; - - if (bitsRead == rbEnd[wrBlock]+1) { - if (outFile != NULL) { - bsPutUChar ( bsWr, 0x17 ); bsPutUChar ( bsWr, 0x72 ); - bsPutUChar ( bsWr, 0x45 ); bsPutUChar ( bsWr, 0x38 ); - bsPutUChar ( bsWr, 0x50 ); bsPutUChar ( bsWr, 0x90 ); - bsPutUInt32 ( bsWr, blockCRC ); - bsClose ( bsWr ); - } - if (wrBlock >= rbCtr) break; - wrBlock++; - } else - if (bitsRead == rbStart[wrBlock]) { - outFileName[0] = 0; - sprintf ( outFileName, "rec%4d", wrBlock+1 ); - for (p = outFileName; *p != 0; p++) if (*p == ' ') *p = '0'; - strcat ( outFileName, inFileName ); - if ( !endsInBz2(outFileName)) strcat ( outFileName, ".bz2" ); - - fprintf ( stderr, " writing block %d to `%s' ...\n", - wrBlock+1, outFileName ); - - outFile = fopen ( outFileName, "wb" ); - if (outFile == NULL) { - fprintf ( stderr, "%s: can't write `%s'\n", - progName, outFileName ); - exit(1); - } - bsWr = bsOpenWriteStream ( outFile ); - bsPutUChar ( bsWr, 'B' ); bsPutUChar ( bsWr, 'Z' ); - bsPutUChar ( bsWr, 'h' ); bsPutUChar ( bsWr, '9' ); - bsPutUChar ( bsWr, 0x31 ); bsPutUChar ( bsWr, 0x41 ); - bsPutUChar ( bsWr, 0x59 ); bsPutUChar ( bsWr, 0x26 ); - bsPutUChar ( bsWr, 0x53 ); bsPutUChar ( bsWr, 0x59 ); - } - } - - fprintf ( stderr, "%s: finished\n", progName ); - return 0; -} - - - -/*-----------------------------------------------------------*/ -/*--- end bzip2recover.c ---*/ -/*-----------------------------------------------------------*/ diff --git a/winsup/bz2lib/bzlib.c b/winsup/bz2lib/bzlib.c deleted file mode 100644 index 4a06d9f..0000000 --- a/winsup/bz2lib/bzlib.c +++ /dev/null @@ -1,1564 +0,0 @@ - -/*-------------------------------------------------------------*/ -/*--- Library top-level functions. ---*/ -/*--- bzlib.c ---*/ -/*-------------------------------------------------------------*/ - -/*-- - This file is a part of bzip2 and/or libbzip2, a program and - library for lossless, block-sorting data compression. - - Copyright (C) 1996-2000 Julian R Seward. All rights reserved. - - Redistribution and use in source and binary forms, with or without - modification, are permitted provided that the following conditions - are met: - - 1. Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - - 2. The origin of this software must not be misrepresented; you must - not claim that you wrote the original software. If you use this - software in a product, an acknowledgment in the product - documentation would be appreciated but is not required. - - 3. Altered source versions must be plainly marked as such, and must - not be misrepresented as being the original software. - - 4. The name of the author may not be used to endorse or promote - products derived from this software without specific prior written - permission. - - THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS - OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED - WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY - DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE - GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS - INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, - WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING - NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS - SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - - Julian Seward, Cambridge, UK. - jseward@acm.org - bzip2/libbzip2 version 1.0 of 21 March 2000 - - This program is based on (at least) the work of: - Mike Burrows - David Wheeler - Peter Fenwick - Alistair Moffat - Radford Neal - Ian H. Witten - Robert Sedgewick - Jon L. Bentley - - For more information on these sources, see the manual. ---*/ - -/*-- - CHANGES - ~~~~~~~ - 0.9.0 -- original version. - - 0.9.0a/b -- no changes in this file. - - 0.9.0c - * made zero-length BZ_FLUSH work correctly in bzCompress(). - * fixed bzWrite/bzRead to ignore zero-length requests. - * fixed bzread to correctly handle read requests after EOF. - * wrong parameter order in call to bzDecompressInit in - bzBuffToBuffDecompress. Fixed. ---*/ - -#include "bzlib_private.h" - - -/*---------------------------------------------------*/ -/*--- Compression stuff ---*/ -/*---------------------------------------------------*/ - - -/*---------------------------------------------------*/ -#ifndef BZ_NO_STDIO -void BZ2_bz__AssertH__fail ( int errcode ) -{ - fprintf(stderr, - "\n\nbzip2/libbzip2: internal error number %d.\n" - "This is a bug in bzip2/libbzip2, %s.\n" - "Please report it to me at: jseward@acm.org. If this happened\n" - "when you were using some program which uses libbzip2 as a\n" - "component, you should also report this bug to the author(s)\n" - "of that program. Please make an effort to report this bug;\n" - "timely and accurate bug reports eventually lead to higher\n" - "quality software. Thanks. Julian Seward, 21 March 2000.\n\n", - errcode, - BZ2_bzlibVersion() - ); - exit(3); -} -#endif - - -/*---------------------------------------------------*/ -static -int bz_config_ok ( void ) -{ - if (sizeof(int) != 4) return 0; - if (sizeof(short) != 2) return 0; - if (sizeof(char) != 1) return 0; - return 1; -} - - -/*---------------------------------------------------*/ -static -void* default_bzalloc ( void* opaque, Int32 items, Int32 size ) -{ - void* v = malloc ( items * size ); - return v; -} - -static -void default_bzfree ( void* opaque, void* addr ) -{ - if (addr != NULL) free ( addr ); -} - - -/*---------------------------------------------------*/ -static -void prepare_new_block ( EState* s ) -{ - Int32 i; - s->nblock = 0; - s->numZ = 0; - s->state_out_pos = 0; - BZ_INITIALISE_CRC ( s->blockCRC ); - for (i = 0; i < 256; i++) s->inUse[i] = False; - s->blockNo++; -} - - -/*---------------------------------------------------*/ -static -void init_RL ( EState* s ) -{ - s->state_in_ch = 256; - s->state_in_len = 0; -} - - -static -Bool isempty_RL ( EState* s ) -{ - if (s->state_in_ch < 256 && s->state_in_len > 0) - return False; else - return True; -} - - -/*---------------------------------------------------*/ -int BZ_API(BZ2_bzCompressInit) - ( bz_stream* strm, - int blockSize100k, - int verbosity, - int workFactor ) -{ - Int32 n; - EState* s; - - if (!bz_config_ok()) return BZ_CONFIG_ERROR; - - if (strm == NULL || - blockSize100k < 1 || blockSize100k > 9 || - workFactor < 0 || workFactor > 250) - return BZ_PARAM_ERROR; - - if (workFactor == 0) workFactor = 30; - if (strm->bzalloc == NULL) strm->bzalloc = default_bzalloc; - if (strm->bzfree == NULL) strm->bzfree = default_bzfree; - - s = BZALLOC( sizeof(EState) ); - if (s == NULL) return BZ_MEM_ERROR; - s->strm = strm; - - s->arr1 = NULL; - s->arr2 = NULL; - s->ftab = NULL; - - n = 100000 * blockSize100k; - s->arr1 = BZALLOC( n * sizeof(UInt32) ); - s->arr2 = BZALLOC( (n+BZ_N_OVERSHOOT) * sizeof(UInt32) ); - s->ftab = BZALLOC( 65537 * sizeof(UInt32) ); - - if (s->arr1 == NULL || s->arr2 == NULL || s->ftab == NULL) { - if (s->arr1 != NULL) BZFREE(s->arr1); - if (s->arr2 != NULL) BZFREE(s->arr2); - if (s->ftab != NULL) BZFREE(s->ftab); - if (s != NULL) BZFREE(s); - return BZ_MEM_ERROR; - } - - s->blockNo = 0; - s->state = BZ_S_INPUT; - s->mode = BZ_M_RUNNING; - s->combinedCRC = 0; - s->blockSize100k = blockSize100k; - s->nblockMAX = 100000 * blockSize100k - 19; - s->verbosity = verbosity; - s->workFactor = workFactor; - - s->block = (UChar*)s->arr2; - s->mtfv = (UInt16*)s->arr1; - s->zbits = NULL; - s->ptr = (UInt32*)s->arr1; - - strm->state = s; - strm->total_in_lo32 = 0; - strm->total_in_hi32 = 0; - strm->total_out_lo32 = 0; - strm->total_out_hi32 = 0; - init_RL ( s ); - prepare_new_block ( s ); - return BZ_OK; -} - - -/*---------------------------------------------------*/ -static -void add_pair_to_block ( EState* s ) -{ - Int32 i; - UChar ch = (UChar)(s->state_in_ch); - for (i = 0; i < s->state_in_len; i++) { - BZ_UPDATE_CRC( s->blockCRC, ch ); - } - s->inUse[s->state_in_ch] = True; - switch (s->state_in_len) { - case 1: - s->block[s->nblock] = (UChar)ch; s->nblock++; - break; - case 2: - s->block[s->nblock] = (UChar)ch; s->nblock++; - s->block[s->nblock] = (UChar)ch; s->nblock++; - break; - case 3: - s->block[s->nblock] = (UChar)ch; s->nblock++; - s->block[s->nblock] = (UChar)ch; s->nblock++; - s->block[s->nblock] = (UChar)ch; s->nblock++; - break; - default: - s->inUse[s->state_in_len-4] = True; - s->block[s->nblock] = (UChar)ch; s->nblock++; - s->block[s->nblock] = (UChar)ch; s->nblock++; - s->block[s->nblock] = (UChar)ch; s->nblock++; - s->block[s->nblock] = (UChar)ch; s->nblock++; - s->block[s->nblock] = ((UChar)(s->state_in_len-4)); - s->nblock++; - break; - } -} - - -/*---------------------------------------------------*/ -static -void flush_RL ( EState* s ) -{ - if (s->state_in_ch < 256) add_pair_to_block ( s ); - init_RL ( s ); -} - - -/*---------------------------------------------------*/ -#define ADD_CHAR_TO_BLOCK(zs,zchh0) \ -{ \ - UInt32 zchh = (UInt32)(zchh0); \ - /*-- fast track the common case --*/ \ - if (zchh != zs->state_in_ch && \ - zs->state_in_len == 1) { \ - UChar ch = (UChar)(zs->state_in_ch); \ - BZ_UPDATE_CRC( zs->blockCRC, ch ); \ - zs->inUse[zs->state_in_ch] = True; \ - zs->block[zs->nblock] = (UChar)ch; \ - zs->nblock++; \ - zs->state_in_ch = zchh; \ - } \ - else \ - /*-- general, uncommon cases --*/ \ - if (zchh != zs->state_in_ch || \ - zs->state_in_len == 255) { \ - if (zs->state_in_ch < 256) \ - add_pair_to_block ( zs ); \ - zs->state_in_ch = zchh; \ - zs->state_in_len = 1; \ - } else { \ - zs->state_in_len++; \ - } \ -} - - -/*---------------------------------------------------*/ -static -Bool copy_input_until_stop ( EState* s ) -{ - Bool progress_in = False; - - if (s->mode == BZ_M_RUNNING) { - - /*-- fast track the common case --*/ - while (True) { - /*-- block full? --*/ - if (s->nblock >= s->nblockMAX) break; - /*-- no input? --*/ - if (s->strm->avail_in == 0) break; - progress_in = True; - ADD_CHAR_TO_BLOCK ( s, (UInt32)(*((UChar*)(s->strm->next_in))) ); - s->strm->next_in++; - s->strm->avail_in--; - s->strm->total_in_lo32++; - if (s->strm->total_in_lo32 == 0) s->strm->total_in_hi32++; - } - - } else { - - /*-- general, uncommon case --*/ - while (True) { - /*-- block full? --*/ - if (s->nblock >= s->nblockMAX) break; - /*-- no input? --*/ - if (s->strm->avail_in == 0) break; - /*-- flush/finish end? --*/ - if (s->avail_in_expect == 0) break; - progress_in = True; - ADD_CHAR_TO_BLOCK ( s, (UInt32)(*((UChar*)(s->strm->next_in))) ); - s->strm->next_in++; - s->strm->avail_in--; - s->strm->total_in_lo32++; - if (s->strm->total_in_lo32 == 0) s->strm->total_in_hi32++; - s->avail_in_expect--; - } - } - return progress_in; -} - - -/*---------------------------------------------------*/ -static -Bool copy_output_until_stop ( EState* s ) -{ - Bool progress_out = False; - - while (True) { - - /*-- no output space? --*/ - if (s->strm->avail_out == 0) break; - - /*-- block done? --*/ - if (s->state_out_pos >= s->numZ) break; - - progress_out = True; - *(s->strm->next_out) = s->zbits[s->state_out_pos]; - s->state_out_pos++; - s->strm->avail_out--; - s->strm->next_out++; - s->strm->total_out_lo32++; - if (s->strm->total_out_lo32 == 0) s->strm->total_out_hi32++; - } - - return progress_out; -} - - -/*---------------------------------------------------*/ -static -Bool handle_compress ( bz_stream* strm ) -{ - Bool progress_in = False; - Bool progress_out = False; - EState* s = strm->state; - - while (True) { - - if (s->state == BZ_S_OUTPUT) { - progress_out |= copy_output_until_stop ( s ); - if (s->state_out_pos < s->numZ) break; - if (s->mode == BZ_M_FINISHING && - s->avail_in_expect == 0 && - isempty_RL(s)) break; - prepare_new_block ( s ); - s->state = BZ_S_INPUT; - if (s->mode == BZ_M_FLUSHING && - s->avail_in_expect == 0 && - isempty_RL(s)) break; - } - - if (s->state == BZ_S_INPUT) { - progress_in |= copy_input_until_stop ( s ); - if (s->mode != BZ_M_RUNNING && s->avail_in_expect == 0) { - flush_RL ( s ); - BZ2_compressBlock ( s, (Bool)(s->mode == BZ_M_FINISHING) ); - s->state = BZ_S_OUTPUT; - } - else - if (s->nblock >= s->nblockMAX) { - BZ2_compressBlock ( s, False ); - s->state = BZ_S_OUTPUT; - } - else - if (s->strm->avail_in == 0) { - break; - } - } - - } - - return progress_in || progress_out; -} - - -/*---------------------------------------------------*/ -int BZ_API(BZ2_bzCompress) ( bz_stream *strm, int action ) -{ - Bool progress; - EState* s; - if (strm == NULL) return BZ_PARAM_ERROR; - s = strm->state; - if (s == NULL) return BZ_PARAM_ERROR; - if (s->strm != strm) return BZ_PARAM_ERROR; - - preswitch: - switch (s->mode) { - - case BZ_M_IDLE: - return BZ_SEQUENCE_ERROR; - - case BZ_M_RUNNING: - if (action == BZ_RUN) { - progress = handle_compress ( strm ); - return progress ? BZ_RUN_OK : BZ_PARAM_ERROR; - } - else - if (action == BZ_FLUSH) { - s->avail_in_expect = strm->avail_in; - s->mode = BZ_M_FLUSHING; - goto preswitch; - } - else - if (action == BZ_FINISH) { - s->avail_in_expect = strm->avail_in; - s->mode = BZ_M_FINISHING; - goto preswitch; - } - else - return BZ_PARAM_ERROR; - - case BZ_M_FLUSHING: - if (action != BZ_FLUSH) return BZ_SEQUENCE_ERROR; - if (s->avail_in_expect != s->strm->avail_in) - return BZ_SEQUENCE_ERROR; - progress = handle_compress ( strm ); - if (s->avail_in_expect > 0 || !isempty_RL(s) || - s->state_out_pos < s->numZ) return BZ_FLUSH_OK; - s->mode = BZ_M_RUNNING; - return BZ_RUN_OK; - - case BZ_M_FINISHING: - if (action != BZ_FINISH) return BZ_SEQUENCE_ERROR; - if (s->avail_in_expect != s->strm->avail_in) - return BZ_SEQUENCE_ERROR; - progress = handle_compress ( strm ); - if (!progress) return BZ_SEQUENCE_ERROR; - if (s->avail_in_expect > 0 || !isempty_RL(s) || - s->state_out_pos < s->numZ) return BZ_FINISH_OK; - s->mode = BZ_M_IDLE; - return BZ_STREAM_END; - } - return BZ_OK; /*--not reached--*/ -} - - -/*---------------------------------------------------*/ -int BZ_API(BZ2_bzCompressEnd) ( bz_stream *strm ) -{ - EState* s; - if (strm == NULL) return BZ_PARAM_ERROR; - s = strm->state; - if (s == NULL) return BZ_PARAM_ERROR; - if (s->strm != strm) return BZ_PARAM_ERROR; - - if (s->arr1 != NULL) BZFREE(s->arr1); - if (s->arr2 != NULL) BZFREE(s->arr2); - if (s->ftab != NULL) BZFREE(s->ftab); - BZFREE(strm->state); - - strm->state = NULL; - - return BZ_OK; -} - - -/*---------------------------------------------------*/ -/*--- Decompression stuff ---*/ -/*---------------------------------------------------*/ - -/*---------------------------------------------------*/ -int BZ_API(BZ2_bzDecompressInit) - ( bz_stream* strm, - int verbosity, - int small ) -{ - DState* s; - - if (!bz_config_ok()) return BZ_CONFIG_ERROR; - - if (strm == NULL) return BZ_PARAM_ERROR; - if (small != 0 && small != 1) return BZ_PARAM_ERROR; - if (verbosity < 0 || verbosity > 4) return BZ_PARAM_ERROR; - - if (strm->bzalloc == NULL) strm->bzalloc = default_bzalloc; - if (strm->bzfree == NULL) strm->bzfree = default_bzfree; - - s = BZALLOC( sizeof(DState) ); - if (s == NULL) return BZ_MEM_ERROR; - s->strm = strm; - strm->state = s; - s->state = BZ_X_MAGIC_1; - s->bsLive = 0; - s->bsBuff = 0; - s->calculatedCombinedCRC = 0; - strm->total_in_lo32 = 0; - strm->total_in_hi32 = 0; - strm->total_out_lo32 = 0; - strm->total_out_hi32 = 0; - s->smallDecompress = (Bool)small; - s->ll4 = NULL; - s->ll16 = NULL; - s->tt = NULL; - s->currBlockNo = 0; - s->verbosity = verbosity; - - return BZ_OK; -} - - -/*---------------------------------------------------*/ -static -void unRLE_obuf_to_output_FAST ( DState* s ) -{ - UChar k1; - - if (s->blockRandomised) { - - while (True) { - /* try to finish existing run */ - while (True) { - if (s->strm->avail_out == 0) return; - if (s->state_out_len == 0) break; - *( (UChar*)(s->strm->next_out) ) = s->state_out_ch; - BZ_UPDATE_CRC ( s->calculatedBlockCRC, s->state_out_ch ); - s->state_out_len--; - s->strm->next_out++; - s->strm->avail_out--; - s->strm->total_out_lo32++; - if (s->strm->total_out_lo32 == 0) s->strm->total_out_hi32++; - } - - /* can a new run be started? */ - if (s->nblock_used == s->save_nblock+1) return; - - - s->state_out_len = 1; - s->state_out_ch = s->k0; - BZ_GET_FAST(k1); BZ_RAND_UPD_MASK; - k1 ^= BZ_RAND_MASK; s->nblock_used++; - if (s->nblock_used == s->save_nblock+1) continue; - if (k1 != s->k0) { s->k0 = k1; continue; }; - - s->state_out_len = 2; - BZ_GET_FAST(k1); BZ_RAND_UPD_MASK; - k1 ^= BZ_RAND_MASK; s->nblock_used++; - if (s->nblock_used == s->save_nblock+1) continue; - if (k1 != s->k0) { s->k0 = k1; continue; }; - - s->state_out_len = 3; - BZ_GET_FAST(k1); BZ_RAND_UPD_MASK; - k1 ^= BZ_RAND_MASK; s->nblock_used++; - if (s->nblock_used == s->save_nblock+1) continue; - if (k1 != s->k0) { s->k0 = k1; continue; }; - - BZ_GET_FAST(k1); BZ_RAND_UPD_MASK; - k1 ^= BZ_RAND_MASK; s->nblock_used++; - s->state_out_len = ((Int32)k1) + 4; - BZ_GET_FAST(s->k0); BZ_RAND_UPD_MASK; - s->k0 ^= BZ_RAND_MASK; s->nblock_used++; - } - - } else { - - /* restore */ - UInt32 c_calculatedBlockCRC = s->calculatedBlockCRC; - UChar c_state_out_ch = s->state_out_ch; - Int32 c_state_out_len = s->state_out_len; - Int32 c_nblock_used = s->nblock_used; - Int32 c_k0 = s->k0; - UInt32* c_tt = s->tt; - UInt32 c_tPos = s->tPos; - char* cs_next_out = s->strm->next_out; - unsigned int cs_avail_out = s->strm->avail_out; - /* end restore */ - - UInt32 avail_out_INIT = cs_avail_out; - Int32 s_save_nblockPP = s->save_nblock+1; - unsigned int total_out_lo32_old; - - while (True) { - - /* try to finish existing run */ - if (c_state_out_len > 0) { - while (True) { - if (cs_avail_out == 0) goto return_notr; - if (c_state_out_len == 1) break; - *( (UChar*)(cs_next_out) ) = c_state_out_ch; - BZ_UPDATE_CRC ( c_calculatedBlockCRC, c_state_out_ch ); - c_state_out_len--; - cs_next_out++; - cs_avail_out--; - } - s_state_out_len_eq_one: - { - if (cs_avail_out == 0) { - c_state_out_len = 1; goto return_notr; - }; - *( (UChar*)(cs_next_out) ) = c_state_out_ch; - BZ_UPDATE_CRC ( c_calculatedBlockCRC, c_state_out_ch ); - cs_next_out++; - cs_avail_out--; - } - } - /* can a new run be started? */ - if (c_nblock_used == s_save_nblockPP) { - c_state_out_len = 0; goto return_notr; - }; - c_state_out_ch = c_k0; - BZ_GET_FAST_C(k1); c_nblock_used++; - if (k1 != c_k0) { - c_k0 = k1; goto s_state_out_len_eq_one; - }; - if (c_nblock_used == s_save_nblockPP) - goto s_state_out_len_eq_one; - - c_state_out_len = 2; - BZ_GET_FAST_C(k1); c_nblock_used++; - if (c_nblock_used == s_save_nblockPP) continue; - if (k1 != c_k0) { c_k0 = k1; continue; }; - - c_state_out_len = 3; - BZ_GET_FAST_C(k1); c_nblock_used++; - if (c_nblock_used == s_save_nblockPP) continue; - if (k1 != c_k0) { c_k0 = k1; continue; }; - - BZ_GET_FAST_C(k1); c_nblock_used++; - c_state_out_len = ((Int32)k1) + 4; - BZ_GET_FAST_C(c_k0); c_nblock_used++; - } - - return_notr: - total_out_lo32_old = s->strm->total_out_lo32; - s->strm->total_out_lo32 += (avail_out_INIT - cs_avail_out); - if (s->strm->total_out_lo32 < total_out_lo32_old) - s->strm->total_out_hi32++; - - /* save */ - s->calculatedBlockCRC = c_calculatedBlockCRC; - s->state_out_ch = c_state_out_ch; - s->state_out_len = c_state_out_len; - s->nblock_used = c_nblock_used; - s->k0 = c_k0; - s->tt = c_tt; - s->tPos = c_tPos; - s->strm->next_out = cs_next_out; - s->strm->avail_out = cs_avail_out; - /* end save */ - } -} - - - -/*---------------------------------------------------*/ -__inline__ Int32 BZ2_indexIntoF ( Int32 indx, Int32 *cftab ) -{ - Int32 nb, na, mid; - nb = 0; - na = 256; - do { - mid = (nb + na) >> 1; - if (indx >= cftab[mid]) nb = mid; else na = mid; - } - while (na - nb != 1); - return nb; -} - - -/*---------------------------------------------------*/ -static -void unRLE_obuf_to_output_SMALL ( DState* s ) -{ - UChar k1; - - if (s->blockRandomised) { - - while (True) { - /* try to finish existing run */ - while (True) { - if (s->strm->avail_out == 0) return; - if (s->state_out_len == 0) break; - *( (UChar*)(s->strm->next_out) ) = s->state_out_ch; - BZ_UPDATE_CRC ( s->calculatedBlockCRC, s->state_out_ch ); - s->state_out_len--; - s->strm->next_out++; - s->strm->avail_out--; - s->strm->total_out_lo32++; - if (s->strm->total_out_lo32 == 0) s->strm->total_out_hi32++; - } - - /* can a new run be started? */ - if (s->nblock_used == s->save_nblock+1) return; - - - s->state_out_len = 1; - s->state_out_ch = s->k0; - BZ_GET_SMALL(k1); BZ_RAND_UPD_MASK; - k1 ^= BZ_RAND_MASK; s->nblock_used++; - if (s->nblock_used == s->save_nblock+1) continue; - if (k1 != s->k0) { s->k0 = k1; continue; }; - - s->state_out_len = 2; - BZ_GET_SMALL(k1); BZ_RAND_UPD_MASK; - k1 ^= BZ_RAND_MASK; s->nblock_used++; - if (s->nblock_used == s->save_nblock+1) continue; - if (k1 != s->k0) { s->k0 = k1; continue; }; - - s->state_out_len = 3; - BZ_GET_SMALL(k1); BZ_RAND_UPD_MASK; - k1 ^= BZ_RAND_MASK; s->nblock_used++; - if (s->nblock_used == s->save_nblock+1) continue; - if (k1 != s->k0) { s->k0 = k1; continue; }; - - BZ_GET_SMALL(k1); BZ_RAND_UPD_MASK; - k1 ^= BZ_RAND_MASK; s->nblock_used++; - s->state_out_len = ((Int32)k1) + 4; - BZ_GET_SMALL(s->k0); BZ_RAND_UPD_MASK; - s->k0 ^= BZ_RAND_MASK; s->nblock_used++; - } - - } else { - - while (True) { - /* try to finish existing run */ - while (True) { - if (s->strm->avail_out == 0) return; - if (s->state_out_len == 0) break; - *( (UChar*)(s->strm->next_out) ) = s->state_out_ch; - BZ_UPDATE_CRC ( s->calculatedBlockCRC, s->state_out_ch ); - s->state_out_len--; - s->strm->next_out++; - s->strm->avail_out--; - s->strm->total_out_lo32++; - if (s->strm->total_out_lo32 == 0) s->strm->total_out_hi32++; - } - - /* can a new run be started? */ - if (s->nblock_used == s->save_nblock+1) return; - - s->state_out_len = 1; - s->state_out_ch = s->k0; - BZ_GET_SMALL(k1); s->nblock_used++; - if (s->nblock_used == s->save_nblock+1) continue; - if (k1 != s->k0) { s->k0 = k1; continue; }; - - s->state_out_len = 2; - BZ_GET_SMALL(k1); s->nblock_used++; - if (s->nblock_used == s->save_nblock+1) continue; - if (k1 != s->k0) { s->k0 = k1; continue; }; - - s->state_out_len = 3; - BZ_GET_SMALL(k1); s->nblock_used++; - if (s->nblock_used == s->save_nblock+1) continue; - if (k1 != s->k0) { s->k0 = k1; continue; }; - - BZ_GET_SMALL(k1); s->nblock_used++; - s->state_out_len = ((Int32)k1) + 4; - BZ_GET_SMALL(s->k0); s->nblock_used++; - } - - } -} - - -/*---------------------------------------------------*/ -int BZ_API(BZ2_bzDecompress) ( bz_stream *strm ) -{ - DState* s; - if (strm == NULL) return BZ_PARAM_ERROR; - s = strm->state; - if (s == NULL) return BZ_PARAM_ERROR; - if (s->strm != strm) return BZ_PARAM_ERROR; - - while (True) { - if (s->state == BZ_X_IDLE) return BZ_SEQUENCE_ERROR; - if (s->state == BZ_X_OUTPUT) { - if (s->smallDecompress) - unRLE_obuf_to_output_SMALL ( s ); else - unRLE_obuf_to_output_FAST ( s ); - if (s->nblock_used == s->save_nblock+1 && s->state_out_len == 0) { - BZ_FINALISE_CRC ( s->calculatedBlockCRC ); - if (s->verbosity >= 3) - VPrintf2 ( " {0x%x, 0x%x}", s->storedBlockCRC, - s->calculatedBlockCRC ); - if (s->verbosity >= 2) VPrintf0 ( "]" ); - if (s->calculatedBlockCRC != s->storedBlockCRC) - return BZ_DATA_ERROR; - s->calculatedCombinedCRC - = (s->calculatedCombinedCRC << 1) | - (s->calculatedCombinedCRC >> 31); - s->calculatedCombinedCRC ^= s->calculatedBlockCRC; - s->state = BZ_X_BLKHDR_1; - } else { - return BZ_OK; - } - } - if (s->state >= BZ_X_MAGIC_1) { - Int32 r = BZ2_decompress ( s ); - if (r == BZ_STREAM_END) { - if (s->verbosity >= 3) - VPrintf2 ( "\n combined CRCs: stored = 0x%x, computed = 0x%x", - s->storedCombinedCRC, s->calculatedCombinedCRC ); - if (s->calculatedCombinedCRC != s->storedCombinedCRC) - return BZ_DATA_ERROR; - return r; - } - if (s->state != BZ_X_OUTPUT) return r; - } - } - - AssertH ( 0, 6001 ); - - return 0; /*NOTREACHED*/ -} - - -/*---------------------------------------------------*/ -int BZ_API(BZ2_bzDecompressEnd) ( bz_stream *strm ) -{ - DState* s; - if (strm == NULL) return BZ_PARAM_ERROR; - s = strm->state; - if (s == NULL) return BZ_PARAM_ERROR; - if (s->strm != strm) return BZ_PARAM_ERROR; - - if (s->tt != NULL) BZFREE(s->tt); - if (s->ll16 != NULL) BZFREE(s->ll16); - if (s->ll4 != NULL) BZFREE(s->ll4); - - BZFREE(strm->state); - strm->state = NULL; - - return BZ_OK; -} - - -#ifndef BZ_NO_STDIO -/*---------------------------------------------------*/ -/*--- File I/O stuff ---*/ -/*---------------------------------------------------*/ - -#define BZ_SETERR(eee) \ -{ \ - if (bzerror != NULL) *bzerror = eee; \ - if (bzf != NULL) bzf->lastErr = eee; \ -} - -typedef - struct { - FILE* handle; - Char buf[BZ_MAX_UNUSED]; - Int32 bufN; - Bool writing; - bz_stream strm; - Int32 lastErr; - Bool initialisedOk; - } - bzFile; - - -/*---------------------------------------------*/ -static Bool myfeof ( FILE* f ) -{ - Int32 c = fgetc ( f ); - if (c == EOF) return True; - ungetc ( c, f ); - return False; -} - - -/*---------------------------------------------------*/ -BZFILE* BZ_API(BZ2_bzWriteOpen) - ( int* bzerror, - FILE* f, - int blockSize100k, - int verbosity, - int workFactor ) -{ - Int32 ret; - bzFile* bzf = NULL; - - BZ_SETERR(BZ_OK); - - if (f == NULL || - (blockSize100k < 1 || blockSize100k > 9) || - (workFactor < 0 || workFactor > 250) || - (verbosity < 0 || verbosity > 4)) - { BZ_SETERR(BZ_PARAM_ERROR); return NULL; }; - - if (ferror(f)) - { BZ_SETERR(BZ_IO_ERROR); return NULL; }; - - bzf = malloc ( sizeof(bzFile) ); - if (bzf == NULL) - { BZ_SETERR(BZ_MEM_ERROR); return NULL; }; - - BZ_SETERR(BZ_OK); - bzf->initialisedOk = False; - bzf->bufN = 0; - bzf->handle = f; - bzf->writing = True; - bzf->strm.bzalloc = NULL; - bzf->strm.bzfree = NULL; - bzf->strm.opaque = NULL; - - if (workFactor == 0) workFactor = 30; - ret = BZ2_bzCompressInit ( &(bzf->strm), blockSize100k, - verbosity, workFactor ); - if (ret != BZ_OK) - { BZ_SETERR(ret); free(bzf); return NULL; }; - - bzf->strm.avail_in = 0; - bzf->initialisedOk = True; - return bzf; -} - - - -/*---------------------------------------------------*/ -void BZ_API(BZ2_bzWrite) - ( int* bzerror, - BZFILE* b, - void* buf, - int len ) -{ - Int32 n, n2, ret; - bzFile* bzf = (bzFile*)b; - - BZ_SETERR(BZ_OK); - if (bzf == NULL || buf == NULL || len < 0) - { BZ_SETERR(BZ_PARAM_ERROR); return; }; - if (!(bzf->writing)) - { BZ_SETERR(BZ_SEQUENCE_ERROR); return; }; - if (ferror(bzf->handle)) - { BZ_SETERR(BZ_IO_ERROR); return; }; - - if (len == 0) - { BZ_SETERR(BZ_OK); return; }; - - bzf->strm.avail_in = len; - bzf->strm.next_in = buf; - - while (True) { - bzf->strm.avail_out = BZ_MAX_UNUSED; - bzf->strm.next_out = bzf->buf; - ret = BZ2_bzCompress ( &(bzf->strm), BZ_RUN ); - if (ret != BZ_RUN_OK) - { BZ_SETERR(ret); return; }; - - if (bzf->strm.avail_out < BZ_MAX_UNUSED) { - n = BZ_MAX_UNUSED - bzf->strm.avail_out; - n2 = fwrite ( (void*)(bzf->buf), sizeof(UChar), - n, bzf->handle ); - if (n != n2 || ferror(bzf->handle)) - { BZ_SETERR(BZ_IO_ERROR); return; }; - } - - if (bzf->strm.avail_in == 0) - { BZ_SETERR(BZ_OK); return; }; - } -} - - -/*---------------------------------------------------*/ -void BZ_API(BZ2_bzWriteClose) - ( int* bzerror, - BZFILE* b, - int abandon, - unsigned int* nbytes_in, - unsigned int* nbytes_out ) -{ - BZ2_bzWriteClose64 ( bzerror, b, abandon, - nbytes_in, NULL, nbytes_out, NULL ); -} - - -void BZ_API(BZ2_bzWriteClose64) - ( int* bzerror, - BZFILE* b, - int abandon, - unsigned int* nbytes_in_lo32, - unsigned int* nbytes_in_hi32, - unsigned int* nbytes_out_lo32, - unsigned int* nbytes_out_hi32 ) -{ - Int32 n, n2, ret; - bzFile* bzf = (bzFile*)b; - - if (bzf == NULL) - { BZ_SETERR(BZ_OK); return; }; - if (!(bzf->writing)) - { BZ_SETERR(BZ_SEQUENCE_ERROR); return; }; - if (ferror(bzf->handle)) - { BZ_SETERR(BZ_IO_ERROR); return; }; - - if (nbytes_in_lo32 != NULL) *nbytes_in_lo32 = 0; - if (nbytes_in_hi32 != NULL) *nbytes_in_hi32 = 0; - if (nbytes_out_lo32 != NULL) *nbytes_out_lo32 = 0; - if (nbytes_out_hi32 != NULL) *nbytes_out_hi32 = 0; - - if ((!abandon) && bzf->lastErr == BZ_OK) { - while (True) { - bzf->strm.avail_out = BZ_MAX_UNUSED; - bzf->strm.next_out = bzf->buf; - ret = BZ2_bzCompress ( &(bzf->strm), BZ_FINISH ); - if (ret != BZ_FINISH_OK && ret != BZ_STREAM_END) - { BZ_SETERR(ret); return; }; - - if (bzf->strm.avail_out < BZ_MAX_UNUSED) { - n = BZ_MAX_UNUSED - bzf->strm.avail_out; - n2 = fwrite ( (void*)(bzf->buf), sizeof(UChar), - n, bzf->handle ); - if (n != n2 || ferror(bzf->handle)) - { BZ_SETERR(BZ_IO_ERROR); return; }; - } - - if (ret == BZ_STREAM_END) break; - } - } - - if ( !abandon && !ferror ( bzf->handle ) ) { - fflush ( bzf->handle ); - if (ferror(bzf->handle)) - { BZ_SETERR(BZ_IO_ERROR); return; }; - } - - if (nbytes_in_lo32 != NULL) - *nbytes_in_lo32 = bzf->strm.total_in_lo32; - if (nbytes_in_hi32 != NULL) - *nbytes_in_hi32 = bzf->strm.total_in_hi32; - if (nbytes_out_lo32 != NULL) - *nbytes_out_lo32 = bzf->strm.total_out_lo32; - if (nbytes_out_hi32 != NULL) - *nbytes_out_hi32 = bzf->strm.total_out_hi32; - - BZ_SETERR(BZ_OK); - BZ2_bzCompressEnd ( &(bzf->strm) ); - free ( bzf ); -} - - -/*---------------------------------------------------*/ -BZFILE* BZ_API(BZ2_bzReadOpen) - ( int* bzerror, - FILE* f, - int verbosity, - int small, - void* unused, - int nUnused ) -{ - bzFile* bzf = NULL; - int ret; - - BZ_SETERR(BZ_OK); - - if (f == NULL || - (small != 0 && small != 1) || - (verbosity < 0 || verbosity > 4) || - (unused == NULL && nUnused != 0) || - (unused != NULL && (nUnused < 0 || nUnused > BZ_MAX_UNUSED))) - { BZ_SETERR(BZ_PARAM_ERROR); return NULL; }; - - if (ferror(f)) - { BZ_SETERR(BZ_IO_ERROR); return NULL; }; - - bzf = malloc ( sizeof(bzFile) ); - if (bzf == NULL) - { BZ_SETERR(BZ_MEM_ERROR); return NULL; }; - - BZ_SETERR(BZ_OK); - - bzf->initialisedOk = False; - bzf->handle = f; - bzf->bufN = 0; - bzf->writing = False; - bzf->strm.bzalloc = NULL; - bzf->strm.bzfree = NULL; - bzf->strm.opaque = NULL; - - while (nUnused > 0) { - bzf->buf[bzf->bufN] = *((UChar*)(unused)); bzf->bufN++; - unused = ((void*)( 1 + ((UChar*)(unused)) )); - nUnused--; - } - - ret = BZ2_bzDecompressInit ( &(bzf->strm), verbosity, small ); - if (ret != BZ_OK) - { BZ_SETERR(ret); free(bzf); return NULL; }; - - bzf->strm.avail_in = bzf->bufN; - bzf->strm.next_in = bzf->buf; - - bzf->initialisedOk = True; - return bzf; -} - - -/*---------------------------------------------------*/ -void BZ_API(BZ2_bzReadClose) ( int *bzerror, BZFILE *b ) -{ - bzFile* bzf = (bzFile*)b; - - BZ_SETERR(BZ_OK); - if (bzf == NULL) - { BZ_SETERR(BZ_OK); return; }; - - if (bzf->writing) - { BZ_SETERR(BZ_SEQUENCE_ERROR); return; }; - - if (bzf->initialisedOk) - (void)BZ2_bzDecompressEnd ( &(bzf->strm) ); - free ( bzf ); -} - - -/*---------------------------------------------------*/ -int BZ_API(BZ2_bzRead) - ( int* bzerror, - BZFILE* b, - void* buf, - int len ) -{ - Int32 n, ret; - bzFile* bzf = (bzFile*)b; - - BZ_SETERR(BZ_OK); - - if (bzf == NULL || buf == NULL || len < 0) - { BZ_SETERR(BZ_PARAM_ERROR); return 0; }; - - if (bzf->writing) - { BZ_SETERR(BZ_SEQUENCE_ERROR); return 0; }; - - if (len == 0) - { BZ_SETERR(BZ_OK); return 0; }; - - bzf->strm.avail_out = len; - bzf->strm.next_out = buf; - - while (True) { - - if (ferror(bzf->handle)) - { BZ_SETERR(BZ_IO_ERROR); return 0; }; - - if (bzf->strm.avail_in == 0 && !myfeof(bzf->handle)) { - n = fread ( bzf->buf, sizeof(UChar), - BZ_MAX_UNUSED, bzf->handle ); - if (ferror(bzf->handle)) - { BZ_SETERR(BZ_IO_ERROR); return 0; }; - bzf->bufN = n; - bzf->strm.avail_in = bzf->bufN; - bzf->strm.next_in = bzf->buf; - } - - ret = BZ2_bzDecompress ( &(bzf->strm) ); - - if (ret != BZ_OK && ret != BZ_STREAM_END) - { BZ_SETERR(ret); return 0; }; - - if (ret == BZ_OK && myfeof(bzf->handle) && - bzf->strm.avail_in == 0 && bzf->strm.avail_out > 0) - { BZ_SETERR(BZ_UNEXPECTED_EOF); return 0; }; - - if (ret == BZ_STREAM_END) - { BZ_SETERR(BZ_STREAM_END); - return len - bzf->strm.avail_out; }; - if (bzf->strm.avail_out == 0) - { BZ_SETERR(BZ_OK); return len; }; - - } - - return 0; /*not reached*/ -} - - -/*---------------------------------------------------*/ -void BZ_API(BZ2_bzReadGetUnused) - ( int* bzerror, - BZFILE* b, - void** unused, - int* nUnused ) -{ - bzFile* bzf = (bzFile*)b; - if (bzf == NULL) - { BZ_SETERR(BZ_PARAM_ERROR); return; }; - if (bzf->lastErr != BZ_STREAM_END) - { BZ_SETERR(BZ_SEQUENCE_ERROR); return; }; - if (unused == NULL || nUnused == NULL) - { BZ_SETERR(BZ_PARAM_ERROR); return; }; - - BZ_SETERR(BZ_OK); - *nUnused = bzf->strm.avail_in; - *unused = bzf->strm.next_in; -} -#endif - - -/*---------------------------------------------------*/ -/*--- Misc convenience stuff ---*/ -/*---------------------------------------------------*/ - -/*---------------------------------------------------*/ -int BZ_API(BZ2_bzBuffToBuffCompress) - ( char* dest, - unsigned int* destLen, - char* source, - unsigned int sourceLen, - int blockSize100k, - int verbosity, - int workFactor ) -{ - bz_stream strm; - int ret; - - if (dest == NULL || destLen == NULL || - source == NULL || - blockSize100k < 1 || blockSize100k > 9 || - verbosity < 0 || verbosity > 4 || - workFactor < 0 || workFactor > 250) - return BZ_PARAM_ERROR; - - if (workFactor == 0) workFactor = 30; - strm.bzalloc = NULL; - strm.bzfree = NULL; - strm.opaque = NULL; - ret = BZ2_bzCompressInit ( &strm, blockSize100k, - verbosity, workFactor ); - if (ret != BZ_OK) return ret; - - strm.next_in = source; - strm.next_out = dest; - strm.avail_in = sourceLen; - strm.avail_out = *destLen; - - ret = BZ2_bzCompress ( &strm, BZ_FINISH ); - if (ret == BZ_FINISH_OK) goto output_overflow; - if (ret != BZ_STREAM_END) goto errhandler; - - /* normal termination */ - *destLen -= strm.avail_out; - BZ2_bzCompressEnd ( &strm ); - return BZ_OK; - - output_overflow: - BZ2_bzCompressEnd ( &strm ); - return BZ_OUTBUFF_FULL; - - errhandler: - BZ2_bzCompressEnd ( &strm ); - return ret; -} - - -/*---------------------------------------------------*/ -int BZ_API(BZ2_bzBuffToBuffDecompress) - ( char* dest, - unsigned int* destLen, - char* source, - unsigned int sourceLen, - int small, - int verbosity ) -{ - bz_stream strm; - int ret; - - if (dest == NULL || destLen == NULL || - source == NULL || - (small != 0 && small != 1) || - verbosity < 0 || verbosity > 4) - return BZ_PARAM_ERROR; - - strm.bzalloc = NULL; - strm.bzfree = NULL; - strm.opaque = NULL; - ret = BZ2_bzDecompressInit ( &strm, verbosity, small ); - if (ret != BZ_OK) return ret; - - strm.next_in = source; - strm.next_out = dest; - strm.avail_in = sourceLen; - strm.avail_out = *destLen; - - ret = BZ2_bzDecompress ( &strm ); - if (ret == BZ_OK) goto output_overflow_or_eof; - if (ret != BZ_STREAM_END) goto errhandler; - - /* normal termination */ - *destLen -= strm.avail_out; - BZ2_bzDecompressEnd ( &strm ); - return BZ_OK; - - output_overflow_or_eof: - if (strm.avail_out > 0) { - BZ2_bzDecompressEnd ( &strm ); - return BZ_UNEXPECTED_EOF; - } else { - BZ2_bzDecompressEnd ( &strm ); - return BZ_OUTBUFF_FULL; - }; - - errhandler: - BZ2_bzDecompressEnd ( &strm ); - return ret; -} - - -/*---------------------------------------------------*/ -/*-- - Code contributed by Yoshioka Tsuneo - (QWF00133@niftyserve.or.jp/tsuneo-y@is.aist-nara.ac.jp), - to support better zlib compatibility. - This code is not _officially_ part of libbzip2 (yet); - I haven't tested it, documented it, or considered the - threading-safeness of it. - If this code breaks, please contact both Yoshioka and me. ---*/ -/*---------------------------------------------------*/ - -/*---------------------------------------------------*/ -/*-- - return version like "0.9.0c". ---*/ -const char * BZ_API(BZ2_bzlibVersion)(void) -{ - return BZ_VERSION; -} - - -#ifndef BZ_NO_STDIO -/*---------------------------------------------------*/ - -#if defined(_WIN32) || defined(OS2) || defined(MSDOS) -# include <fcntl.h> -# include <io.h> -# define SET_BINARY_MODE(file) setmode(fileno(file),O_BINARY) -#else -# define SET_BINARY_MODE(file) -#endif -static -BZFILE * bzopen_or_bzdopen - ( const char *path, /* no use when bzdopen */ - int fd, /* no use when bzdopen */ - const char *mode, - int open_mode) /* bzopen: 0, bzdopen:1 */ -{ - int bzerr; - char unused[BZ_MAX_UNUSED]; - int blockSize100k = 9; - int writing = 0; - char mode2[10] = ""; - FILE *fp = NULL; - BZFILE *bzfp = NULL; - int verbosity = 0; - int workFactor = 30; - int smallMode = 0; - int nUnused = 0; - - if (mode == NULL) return NULL; - while (*mode) { - switch (*mode) { - case 'r': - writing = 0; break; - case 'w': - writing = 1; break; - case 's': - smallMode = 1; break; - default: - if (isdigit((int)(*mode))) { - blockSize100k = *mode-'0'; - } - } - mode++; - } - strcat(mode2, writing ? "w" : "r" ); - strcat(mode2,"b"); /* binary mode */ - - if (open_mode==0) { - if (path==NULL || strcmp(path,"")==0) { - fp = (writing ? stdout : stdin); - SET_BINARY_MODE(fp); - } else { - fp = fopen(path,mode2); - } - } else { -#ifdef BZ_STRICT_ANSI - fp = NULL; -#else - fp = fdopen(fd,mode2); -#endif - } - if (fp == NULL) return NULL; - - if (writing) { - /* Guard against total chaos and anarchy -- JRS */ - if (blockSize100k < 1) blockSize100k = 1; - if (blockSize100k > 9) blockSize100k = 9; - bzfp = BZ2_bzWriteOpen(&bzerr,fp,blockSize100k, - verbosity,workFactor); - } else { - bzfp = BZ2_bzReadOpen(&bzerr,fp,verbosity,smallMode, - unused,nUnused); - } - if (bzfp == NULL) { - if (fp != stdin && fp != stdout) fclose(fp); - return NULL; - } - return bzfp; -} - - -/*---------------------------------------------------*/ -/*-- - open file for read or write. - ex) bzopen("file","w9") - case path="" or NULL => use stdin or stdout. ---*/ -BZFILE * BZ_API(BZ2_bzopen) - ( const char *path, - const char *mode ) -{ - return bzopen_or_bzdopen(path,-1,mode,/*bzopen*/0); -} - - -/*---------------------------------------------------*/ -BZFILE * BZ_API(BZ2_bzdopen) - ( int fd, - const char *mode ) -{ - return bzopen_or_bzdopen(NULL,fd,mode,/*bzdopen*/1); -} - - -/*---------------------------------------------------*/ -int BZ_API(BZ2_bzread) (BZFILE* b, void* buf, int len ) -{ - int bzerr, nread; - if (((bzFile*)b)->lastErr == BZ_STREAM_END) return 0; - nread = BZ2_bzRead(&bzerr,b,buf,len); - if (bzerr == BZ_OK || bzerr == BZ_STREAM_END) { - return nread; - } else { - return -1; - } -} - - -/*---------------------------------------------------*/ -int BZ_API(BZ2_bzwrite) (BZFILE* b, void* buf, int len ) -{ - int bzerr; - - BZ2_bzWrite(&bzerr,b,buf,len); - if(bzerr == BZ_OK){ - return len; - }else{ - return -1; - } -} - - -/*---------------------------------------------------*/ -int BZ_API(BZ2_bzflush) (BZFILE *b) -{ - /* do nothing now... */ - return 0; -} - - -/*---------------------------------------------------*/ -void BZ_API(BZ2_bzclose) (BZFILE* b) -{ - int bzerr; - FILE *fp = ((bzFile *)b)->handle; - - if (b==NULL) {return;} - if(((bzFile*)b)->writing){ - BZ2_bzWriteClose(&bzerr,b,0,NULL,NULL); - if(bzerr != BZ_OK){ - BZ2_bzWriteClose(NULL,b,1,NULL,NULL); - } - }else{ - BZ2_bzReadClose(&bzerr,b); - } - if(fp!=stdin && fp!=stdout){ - fclose(fp); - } -} - - -/*---------------------------------------------------*/ -/*-- - return last error code ---*/ -static char *bzerrorstrings[] = { - "OK" - ,"SEQUENCE_ERROR" - ,"PARAM_ERROR" - ,"MEM_ERROR" - ,"DATA_ERROR" - ,"DATA_ERROR_MAGIC" - ,"IO_ERROR" - ,"UNEXPECTED_EOF" - ,"OUTBUFF_FULL" - ,"CONFIG_ERROR" - ,"???" /* for future */ - ,"???" /* for future */ - ,"???" /* for future */ - ,"???" /* for future */ - ,"???" /* for future */ - ,"???" /* for future */ -}; - - -const char * BZ_API(BZ2_bzerror) (BZFILE *b, int *errnum) -{ - int err = ((bzFile *)b)->lastErr; - - if(err>0) err = 0; - *errnum = err; - return bzerrorstrings[err*-1]; -} -#endif - - -/*-------------------------------------------------------------*/ -/*--- end bzlib.c ---*/ -/*-------------------------------------------------------------*/ diff --git a/winsup/bz2lib/bzlib.h b/winsup/bz2lib/bzlib.h deleted file mode 100644 index c9447a2..0000000 --- a/winsup/bz2lib/bzlib.h +++ /dev/null @@ -1,319 +0,0 @@ - -/*-------------------------------------------------------------*/ -/*--- Public header file for the library. ---*/ -/*--- bzlib.h ---*/ -/*-------------------------------------------------------------*/ - -/*-- - This file is a part of bzip2 and/or libbzip2, a program and - library for lossless, block-sorting data compression. - - Copyright (C) 1996-2000 Julian R Seward. All rights reserved. - - Redistribution and use in source and binary forms, with or without - modification, are permitted provided that the following conditions - are met: - - 1. Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - - 2. The origin of this software must not be misrepresented; you must - not claim that you wrote the original software. If you use this - software in a product, an acknowledgment in the product - documentation would be appreciated but is not required. - - 3. Altered source versions must be plainly marked as such, and must - not be misrepresented as being the original software. - - 4. The name of the author may not be used to endorse or promote - products derived from this software without specific prior written - permission. - - THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS - OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED - WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY - DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE - GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS - INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, - WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING - NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS - SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - - Julian Seward, Cambridge, UK. - jseward@acm.org - bzip2/libbzip2 version 1.0 of 21 March 2000 - - This program is based on (at least) the work of: - Mike Burrows - David Wheeler - Peter Fenwick - Alistair Moffat - Radford Neal - Ian H. Witten - Robert Sedgewick - Jon L. Bentley - - For more information on these sources, see the manual. ---*/ - - -#ifndef _BZLIB_H -#define _BZLIB_H - -#ifdef __cplusplus -extern "C" { -#endif - -#define BZ_RUN 0 -#define BZ_FLUSH 1 -#define BZ_FINISH 2 - -#define BZ_OK 0 -#define BZ_RUN_OK 1 -#define BZ_FLUSH_OK 2 -#define BZ_FINISH_OK 3 -#define BZ_STREAM_END 4 -#define BZ_SEQUENCE_ERROR (-1) -#define BZ_PARAM_ERROR (-2) -#define BZ_MEM_ERROR (-3) -#define BZ_DATA_ERROR (-4) -#define BZ_DATA_ERROR_MAGIC (-5) -#define BZ_IO_ERROR (-6) -#define BZ_UNEXPECTED_EOF (-7) -#define BZ_OUTBUFF_FULL (-8) -#define BZ_CONFIG_ERROR (-9) - -typedef - struct { - char *next_in; - unsigned int avail_in; - unsigned int total_in_lo32; - unsigned int total_in_hi32; - - char *next_out; - unsigned int avail_out; - unsigned int total_out_lo32; - unsigned int total_out_hi32; - - void *state; - - void *(*bzalloc)(void *,int,int); - void (*bzfree)(void *,void *); - void *opaque; - } - bz_stream; - - -#ifndef BZ_IMPORT -#define BZ_EXPORT -#endif - -#ifdef _WIN32 -# include <stdio.h> -# include <windows.h> -# ifdef small - /* windows.h define small to char */ -# undef small -# endif -# ifdef BZ_EXPORT -# define BZ_API(func) WINAPI func -# define BZ_EXTERN extern -# else - /* import windows dll dynamically */ -# define BZ_API(func) (WINAPI * func) -# define BZ_EXTERN -# endif -#else -# define BZ_API(func) func -# define BZ_EXTERN extern -#endif - - -/*-- Core (low-level) library functions --*/ - -BZ_EXTERN int BZ_API(BZ2_bzCompressInit) ( - bz_stream* strm, - int blockSize100k, - int verbosity, - int workFactor - ); - -BZ_EXTERN int BZ_API(BZ2_bzCompress) ( - bz_stream* strm, - int action - ); - -BZ_EXTERN int BZ_API(BZ2_bzCompressEnd) ( - bz_stream* strm - ); - -BZ_EXTERN int BZ_API(BZ2_bzDecompressInit) ( - bz_stream *strm, - int verbosity, - int small - ); - -BZ_EXTERN int BZ_API(BZ2_bzDecompress) ( - bz_stream* strm - ); - -BZ_EXTERN int BZ_API(BZ2_bzDecompressEnd) ( - bz_stream *strm - ); - - - -/*-- High(er) level library functions --*/ - -#ifndef BZ_NO_STDIO -#define BZ_MAX_UNUSED 5000 - -typedef void BZFILE; - -BZ_EXTERN BZFILE* BZ_API(BZ2_bzReadOpen) ( - int* bzerror, - FILE* f, - int verbosity, - int small, - void* unused, - int nUnused - ); - -BZ_EXTERN void BZ_API(BZ2_bzReadClose) ( - int* bzerror, - BZFILE* b - ); - -BZ_EXTERN void BZ_API(BZ2_bzReadGetUnused) ( - int* bzerror, - BZFILE* b, - void** unused, - int* nUnused - ); - -BZ_EXTERN int BZ_API(BZ2_bzRead) ( - int* bzerror, - BZFILE* b, - void* buf, - int len - ); - -BZ_EXTERN BZFILE* BZ_API(BZ2_bzWriteOpen) ( - int* bzerror, - FILE* f, - int blockSize100k, - int verbosity, - int workFactor - ); - -BZ_EXTERN void BZ_API(BZ2_bzWrite) ( - int* bzerror, - BZFILE* b, - void* buf, - int len - ); - -BZ_EXTERN void BZ_API(BZ2_bzWriteClose) ( - int* bzerror, - BZFILE* b, - int abandon, - unsigned int* nbytes_in, - unsigned int* nbytes_out - ); - -BZ_EXTERN void BZ_API(BZ2_bzWriteClose64) ( - int* bzerror, - BZFILE* b, - int abandon, - unsigned int* nbytes_in_lo32, - unsigned int* nbytes_in_hi32, - unsigned int* nbytes_out_lo32, - unsigned int* nbytes_out_hi32 - ); -#endif - - -/*-- Utility functions --*/ - -BZ_EXTERN int BZ_API(BZ2_bzBuffToBuffCompress) ( - char* dest, - unsigned int* destLen, - char* source, - unsigned int sourceLen, - int blockSize100k, - int verbosity, - int workFactor - ); - -BZ_EXTERN int BZ_API(BZ2_bzBuffToBuffDecompress) ( - char* dest, - unsigned int* destLen, - char* source, - unsigned int sourceLen, - int small, - int verbosity - ); - - -/*-- - Code contributed by Yoshioka Tsuneo - (QWF00133@niftyserve.or.jp/tsuneo-y@is.aist-nara.ac.jp), - to support better zlib compatibility. - This code is not _officially_ part of libbzip2 (yet); - I haven't tested it, documented it, or considered the - threading-safeness of it. - If this code breaks, please contact both Yoshioka and me. ---*/ - -BZ_EXTERN const char * BZ_API(BZ2_bzlibVersion) ( - void - ); - -#ifndef BZ_NO_STDIO -BZ_EXTERN BZFILE * BZ_API(BZ2_bzopen) ( - const char *path, - const char *mode - ); - -BZ_EXTERN BZFILE * BZ_API(BZ2_bzdopen) ( - int fd, - const char *mode - ); - -BZ_EXTERN int BZ_API(BZ2_bzread) ( - BZFILE* b, - void* buf, - int len - ); - -BZ_EXTERN int BZ_API(BZ2_bzwrite) ( - BZFILE* b, - void* buf, - int len - ); - -BZ_EXTERN int BZ_API(BZ2_bzflush) ( - BZFILE* b - ); - -BZ_EXTERN void BZ_API(BZ2_bzclose) ( - BZFILE* b - ); - -BZ_EXTERN const char * BZ_API(BZ2_bzerror) ( - BZFILE *b, - int *errnum - ); -#endif - -#ifdef __cplusplus -} -#endif - -#endif - -/*-------------------------------------------------------------*/ -/*--- end bzlib.h ---*/ -/*-------------------------------------------------------------*/ diff --git a/winsup/bz2lib/bzlib_private.h b/winsup/bz2lib/bzlib_private.h deleted file mode 100644 index fb51c7a..0000000 --- a/winsup/bz2lib/bzlib_private.h +++ /dev/null @@ -1,530 +0,0 @@ - -/*-------------------------------------------------------------*/ -/*--- Private header file for the library. ---*/ -/*--- bzlib_private.h ---*/ -/*-------------------------------------------------------------*/ - -/*-- - This file is a part of bzip2 and/or libbzip2, a program and - library for lossless, block-sorting data compression. - - Copyright (C) 1996-2000 Julian R Seward. All rights reserved. - - Redistribution and use in source and binary forms, with or without - modification, are permitted provided that the following conditions - are met: - - 1. Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - - 2. The origin of this software must not be misrepresented; you must - not claim that you wrote the original software. If you use this - software in a product, an acknowledgment in the product - documentation would be appreciated but is not required. - - 3. Altered source versions must be plainly marked as such, and must - not be misrepresented as being the original software. - - 4. The name of the author may not be used to endorse or promote - products derived from this software without specific prior written - permission. - - THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS - OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED - WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY - DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE - GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS - INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, - WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING - NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS - SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - - Julian Seward, Cambridge, UK. - jseward@acm.org - bzip2/libbzip2 version 1.0 of 21 March 2000 - - This program is based on (at least) the work of: - Mike Burrows - David Wheeler - Peter Fenwick - Alistair Moffat - Radford Neal - Ian H. Witten - Robert Sedgewick - Jon L. Bentley - - For more information on these sources, see the manual. ---*/ - - -#ifndef _BZLIB_PRIVATE_H -#define _BZLIB_PRIVATE_H - -#include <stdlib.h> - -#ifndef BZ_NO_STDIO -#include <stdio.h> -#include <ctype.h> -#include <string.h> -#endif - -#include "bzlib.h" - - - -/*-- General stuff. --*/ - -#define BZ_VERSION "1.0.1, 23-June-2000" - -typedef char Char; -typedef unsigned char Bool; -typedef unsigned char UChar; -typedef int Int32; -typedef unsigned int UInt32; -typedef short Int16; -typedef unsigned short UInt16; - -#define True ((Bool)1) -#define False ((Bool)0) - -#ifndef __GNUC__ -#define __inline__ /* */ -#endif - -#ifndef BZ_NO_STDIO -extern void BZ2_bz__AssertH__fail ( int errcode ); -#define AssertH(cond,errcode) \ - { if (!(cond)) BZ2_bz__AssertH__fail ( errcode ); } -#if BZ_DEBUG -#define AssertD(cond,msg) \ - { if (!(cond)) { \ - fprintf ( stderr, \ - "\n\nlibbzip2(debug build): internal error\n\t%s\n", msg );\ - exit(1); \ - }} -#else -#define AssertD(cond,msg) /* */ -#endif -#define VPrintf0(zf) \ - fprintf(stderr,zf) -#define VPrintf1(zf,za1) \ - fprintf(stderr,zf,za1) -#define VPrintf2(zf,za1,za2) \ - fprintf(stderr,zf,za1,za2) -#define VPrintf3(zf,za1,za2,za3) \ - fprintf(stderr,zf,za1,za2,za3) -#define VPrintf4(zf,za1,za2,za3,za4) \ - fprintf(stderr,zf,za1,za2,za3,za4) -#define VPrintf5(zf,za1,za2,za3,za4,za5) \ - fprintf(stderr,zf,za1,za2,za3,za4,za5) -#else -extern void bz_internal_error ( int errcode ); -#define AssertH(cond,errcode) \ - { if (!(cond)) bz_internal_error ( errcode ); } -#define AssertD(cond,msg) /* */ -#define VPrintf0(zf) /* */ -#define VPrintf1(zf,za1) /* */ -#define VPrintf2(zf,za1,za2) /* */ -#define VPrintf3(zf,za1,za2,za3) /* */ -#define VPrintf4(zf,za1,za2,za3,za4) /* */ -#define VPrintf5(zf,za1,za2,za3,za4,za5) /* */ -#endif - - -#define BZALLOC(nnn) (strm->bzalloc)(strm->opaque,(nnn),1) -#define BZFREE(ppp) (strm->bzfree)(strm->opaque,(ppp)) - - -/*-- Constants for the back end. --*/ - -#define BZ_MAX_ALPHA_SIZE 258 -#define BZ_MAX_CODE_LEN 23 - -#define BZ_RUNA 0 -#define BZ_RUNB 1 - -#define BZ_N_GROUPS 6 -#define BZ_G_SIZE 50 -#define BZ_N_ITERS 4 - -#define BZ_MAX_SELECTORS (2 + (900000 / BZ_G_SIZE)) - - - -/*-- Stuff for randomising repetitive blocks. --*/ - -extern Int32 BZ2_rNums[512]; - -#define BZ_RAND_DECLS \ - Int32 rNToGo; \ - Int32 rTPos \ - -#define BZ_RAND_INIT_MASK \ - s->rNToGo = 0; \ - s->rTPos = 0 \ - -#define BZ_RAND_MASK ((s->rNToGo == 1) ? 1 : 0) - -#define BZ_RAND_UPD_MASK \ - if (s->rNToGo == 0) { \ - s->rNToGo = BZ2_rNums[s->rTPos]; \ - s->rTPos++; \ - if (s->rTPos == 512) s->rTPos = 0; \ - } \ - s->rNToGo--; - - - -/*-- Stuff for doing CRCs. --*/ - -extern UInt32 BZ2_crc32Table[256]; - -#define BZ_INITIALISE_CRC(crcVar) \ -{ \ - crcVar = 0xffffffffL; \ -} - -#define BZ_FINALISE_CRC(crcVar) \ -{ \ - crcVar = ~(crcVar); \ -} - -#define BZ_UPDATE_CRC(crcVar,cha) \ -{ \ - crcVar = (crcVar << 8) ^ \ - BZ2_crc32Table[(crcVar >> 24) ^ \ - ((UChar)cha)]; \ -} - - - -/*-- States and modes for compression. --*/ - -#define BZ_M_IDLE 1 -#define BZ_M_RUNNING 2 -#define BZ_M_FLUSHING 3 -#define BZ_M_FINISHING 4 - -#define BZ_S_OUTPUT 1 -#define BZ_S_INPUT 2 - -#define BZ_N_RADIX 2 -#define BZ_N_QSORT 12 -#define BZ_N_SHELL 18 -#define BZ_N_OVERSHOOT (BZ_N_RADIX + BZ_N_QSORT + BZ_N_SHELL + 2) - - - - -/*-- Structure holding all the compression-side stuff. --*/ - -typedef - struct { - /* pointer back to the struct bz_stream */ - bz_stream* strm; - - /* mode this stream is in, and whether inputting */ - /* or outputting data */ - Int32 mode; - Int32 state; - - /* remembers avail_in when flush/finish requested */ - UInt32 avail_in_expect; - - /* for doing the block sorting */ - UInt32* arr1; - UInt32* arr2; - UInt32* ftab; - Int32 origPtr; - - /* aliases for arr1 and arr2 */ - UInt32* ptr; - UChar* block; - UInt16* mtfv; - UChar* zbits; - - /* for deciding when to use the fallback sorting algorithm */ - Int32 workFactor; - - /* run-length-encoding of the input */ - UInt32 state_in_ch; - Int32 state_in_len; - BZ_RAND_DECLS; - - /* input and output limits and current posns */ - Int32 nblock; - Int32 nblockMAX; - Int32 numZ; - Int32 state_out_pos; - - /* map of bytes used in block */ - Int32 nInUse; - Bool inUse[256]; - UChar unseqToSeq[256]; - - /* the buffer for bit stream creation */ - UInt32 bsBuff; - Int32 bsLive; - - /* block and combined CRCs */ - UInt32 blockCRC; - UInt32 combinedCRC; - - /* misc administratium */ - Int32 verbosity; - Int32 blockNo; - Int32 blockSize100k; - - /* stuff for coding the MTF values */ - Int32 nMTF; - Int32 mtfFreq [BZ_MAX_ALPHA_SIZE]; - UChar selector [BZ_MAX_SELECTORS]; - UChar selectorMtf[BZ_MAX_SELECTORS]; - - UChar len [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE]; - Int32 code [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE]; - Int32 rfreq [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE]; - /* second dimension: only 3 needed; 4 makes index calculations faster */ - UInt32 len_pack[BZ_MAX_ALPHA_SIZE][4]; - - } - EState; - - - -/*-- externs for compression. --*/ - -extern void -BZ2_blockSort ( EState* ); - -extern void -BZ2_compressBlock ( EState*, Bool ); - -extern void -BZ2_bsInitWrite ( EState* ); - -extern void -BZ2_hbAssignCodes ( Int32*, UChar*, Int32, Int32, Int32 ); - -extern void -BZ2_hbMakeCodeLengths ( UChar*, Int32*, Int32, Int32 ); - - - -/*-- states for decompression. --*/ - -#define BZ_X_IDLE 1 -#define BZ_X_OUTPUT 2 - -#define BZ_X_MAGIC_1 10 -#define BZ_X_MAGIC_2 11 -#define BZ_X_MAGIC_3 12 -#define BZ_X_MAGIC_4 13 -#define BZ_X_BLKHDR_1 14 -#define BZ_X_BLKHDR_2 15 -#define BZ_X_BLKHDR_3 16 -#define BZ_X_BLKHDR_4 17 -#define BZ_X_BLKHDR_5 18 -#define BZ_X_BLKHDR_6 19 -#define BZ_X_BCRC_1 20 -#define BZ_X_BCRC_2 21 -#define BZ_X_BCRC_3 22 -#define BZ_X_BCRC_4 23 -#define BZ_X_RANDBIT 24 -#define BZ_X_ORIGPTR_1 25 -#define BZ_X_ORIGPTR_2 26 -#define BZ_X_ORIGPTR_3 27 -#define BZ_X_MAPPING_1 28 -#define BZ_X_MAPPING_2 29 -#define BZ_X_SELECTOR_1 30 -#define BZ_X_SELECTOR_2 31 -#define BZ_X_SELECTOR_3 32 -#define BZ_X_CODING_1 33 -#define BZ_X_CODING_2 34 -#define BZ_X_CODING_3 35 -#define BZ_X_MTF_1 36 -#define BZ_X_MTF_2 37 -#define BZ_X_MTF_3 38 -#define BZ_X_MTF_4 39 -#define BZ_X_MTF_5 40 -#define BZ_X_MTF_6 41 -#define BZ_X_ENDHDR_2 42 -#define BZ_X_ENDHDR_3 43 -#define BZ_X_ENDHDR_4 44 -#define BZ_X_ENDHDR_5 45 -#define BZ_X_ENDHDR_6 46 -#define BZ_X_CCRC_1 47 -#define BZ_X_CCRC_2 48 -#define BZ_X_CCRC_3 49 -#define BZ_X_CCRC_4 50 - - - -/*-- Constants for the fast MTF decoder. --*/ - -#define MTFA_SIZE 4096 -#define MTFL_SIZE 16 - - - -/*-- Structure holding all the decompression-side stuff. --*/ - -typedef - struct { - /* pointer back to the struct bz_stream */ - bz_stream* strm; - - /* state indicator for this stream */ - Int32 state; - - /* for doing the final run-length decoding */ - UChar state_out_ch; - Int32 state_out_len; - Bool blockRandomised; - BZ_RAND_DECLS; - - /* the buffer for bit stream reading */ - UInt32 bsBuff; - Int32 bsLive; - - /* misc administratium */ - Int32 blockSize100k; - Bool smallDecompress; - Int32 currBlockNo; - Int32 verbosity; - - /* for undoing the Burrows-Wheeler transform */ - Int32 origPtr; - UInt32 tPos; - Int32 k0; - Int32 unzftab[256]; - Int32 nblock_used; - Int32 cftab[257]; - Int32 cftabCopy[257]; - - /* for undoing the Burrows-Wheeler transform (FAST) */ - UInt32 *tt; - - /* for undoing the Burrows-Wheeler transform (SMALL) */ - UInt16 *ll16; - UChar *ll4; - - /* stored and calculated CRCs */ - UInt32 storedBlockCRC; - UInt32 storedCombinedCRC; - UInt32 calculatedBlockCRC; - UInt32 calculatedCombinedCRC; - - /* map of bytes used in block */ - Int32 nInUse; - Bool inUse[256]; - Bool inUse16[16]; - UChar seqToUnseq[256]; - - /* for decoding the MTF values */ - UChar mtfa [MTFA_SIZE]; - Int32 mtfbase[256 / MTFL_SIZE]; - UChar selector [BZ_MAX_SELECTORS]; - UChar selectorMtf[BZ_MAX_SELECTORS]; - UChar len [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE]; - - Int32 limit [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE]; - Int32 base [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE]; - Int32 perm [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE]; - Int32 minLens[BZ_N_GROUPS]; - - /* save area for scalars in the main decompress code */ - Int32 save_i; - Int32 save_j; - Int32 save_t; - Int32 save_alphaSize; - Int32 save_nGroups; - Int32 save_nSelectors; - Int32 save_EOB; - Int32 save_groupNo; - Int32 save_groupPos; - Int32 save_nextSym; - Int32 save_nblockMAX; - Int32 save_nblock; - Int32 save_es; - Int32 save_N; - Int32 save_curr; - Int32 save_zt; - Int32 save_zn; - Int32 save_zvec; - Int32 save_zj; - Int32 save_gSel; - Int32 save_gMinlen; - Int32* save_gLimit; - Int32* save_gBase; - Int32* save_gPerm; - - } - DState; - - - -/*-- Macros for decompression. --*/ - -#define BZ_GET_FAST(cccc) \ - s->tPos = s->tt[s->tPos]; \ - cccc = (UChar)(s->tPos & 0xff); \ - s->tPos >>= 8; - -#define BZ_GET_FAST_C(cccc) \ - c_tPos = c_tt[c_tPos]; \ - cccc = (UChar)(c_tPos & 0xff); \ - c_tPos >>= 8; - -#define SET_LL4(i,n) \ - { if (((i) & 0x1) == 0) \ - s->ll4[(i) >> 1] = (s->ll4[(i) >> 1] & 0xf0) | (n); else \ - s->ll4[(i) >> 1] = (s->ll4[(i) >> 1] & 0x0f) | ((n) << 4); \ - } - -#define GET_LL4(i) \ - ((((UInt32)(s->ll4[(i) >> 1])) >> (((i) << 2) & 0x4)) & 0xF) - -#define SET_LL(i,n) \ - { s->ll16[i] = (UInt16)(n & 0x0000ffff); \ - SET_LL4(i, n >> 16); \ - } - -#define GET_LL(i) \ - (((UInt32)s->ll16[i]) | (GET_LL4(i) << 16)) - -#define BZ_GET_SMALL(cccc) \ - cccc = BZ2_indexIntoF ( s->tPos, s->cftab ); \ - s->tPos = GET_LL(s->tPos); - - -/*-- externs for decompression. --*/ - -extern Int32 -BZ2_indexIntoF ( Int32, Int32* ); - -extern Int32 -BZ2_decompress ( DState* ); - -extern void -BZ2_hbCreateDecodeTables ( Int32*, Int32*, Int32*, UChar*, - Int32, Int32, Int32 ); - - -#endif - - -/*-- BZ_NO_STDIO seems to make NULL disappear on some platforms. --*/ - -#ifdef BZ_NO_STDIO -#ifndef NULL -#define NULL 0 -#endif -#endif - - -/*-------------------------------------------------------------*/ -/*--- end bzlib_private.h ---*/ -/*-------------------------------------------------------------*/ diff --git a/winsup/bz2lib/compress.c b/winsup/bz2lib/compress.c deleted file mode 100644 index cc5e31d..0000000 --- a/winsup/bz2lib/compress.c +++ /dev/null @@ -1,714 +0,0 @@ - -/*-------------------------------------------------------------*/ -/*--- Compression machinery (not incl block sorting) ---*/ -/*--- compress.c ---*/ -/*-------------------------------------------------------------*/ - -/*-- - This file is a part of bzip2 and/or libbzip2, a program and - library for lossless, block-sorting data compression. - - Copyright (C) 1996-2000 Julian R Seward. All rights reserved. - - Redistribution and use in source and binary forms, with or without - modification, are permitted provided that the following conditions - are met: - - 1. Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - - 2. The origin of this software must not be misrepresented; you must - not claim that you wrote the original software. If you use this - software in a product, an acknowledgment in the product - documentation would be appreciated but is not required. - - 3. Altered source versions must be plainly marked as such, and must - not be misrepresented as being the original software. - - 4. The name of the author may not be used to endorse or promote - products derived from this software without specific prior written - permission. - - THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS - OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED - WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY - DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE - GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS - INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, - WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING - NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS - SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - - Julian Seward, Cambridge, UK. - jseward@acm.org - bzip2/libbzip2 version 1.0 of 21 March 2000 - - This program is based on (at least) the work of: - Mike Burrows - David Wheeler - Peter Fenwick - Alistair Moffat - Radford Neal - Ian H. Witten - Robert Sedgewick - Jon L. Bentley - - For more information on these sources, see the manual. ---*/ - -/*-- - CHANGES - ~~~~~~~ - 0.9.0 -- original version. - - 0.9.0a/b -- no changes in this file. - - 0.9.0c - * changed setting of nGroups in sendMTFValues() so as to - do a bit better on small files ---*/ - -#include "bzlib_private.h" - - -/*---------------------------------------------------*/ -/*--- Bit stream I/O ---*/ -/*---------------------------------------------------*/ - -/*---------------------------------------------------*/ -void BZ2_bsInitWrite ( EState* s ) -{ - s->bsLive = 0; - s->bsBuff = 0; -} - - -/*---------------------------------------------------*/ -static -void bsFinishWrite ( EState* s ) -{ - while (s->bsLive > 0) { - s->zbits[s->numZ] = (UChar)(s->bsBuff >> 24); - s->numZ++; - s->bsBuff <<= 8; - s->bsLive -= 8; - } -} - - -/*---------------------------------------------------*/ -#define bsNEEDW(nz) \ -{ \ - while (s->bsLive >= 8) { \ - s->zbits[s->numZ] \ - = (UChar)(s->bsBuff >> 24); \ - s->numZ++; \ - s->bsBuff <<= 8; \ - s->bsLive -= 8; \ - } \ -} - - -/*---------------------------------------------------*/ -static -__inline__ -void bsW ( EState* s, Int32 n, UInt32 v ) -{ - bsNEEDW ( n ); - s->bsBuff |= (v << (32 - s->bsLive - n)); - s->bsLive += n; -} - - -/*---------------------------------------------------*/ -static -void bsPutUInt32 ( EState* s, UInt32 u ) -{ - bsW ( s, 8, (u >> 24) & 0xffL ); - bsW ( s, 8, (u >> 16) & 0xffL ); - bsW ( s, 8, (u >> 8) & 0xffL ); - bsW ( s, 8, u & 0xffL ); -} - - -/*---------------------------------------------------*/ -static -void bsPutUChar ( EState* s, UChar c ) -{ - bsW( s, 8, (UInt32)c ); -} - - -/*---------------------------------------------------*/ -/*--- The back end proper ---*/ -/*---------------------------------------------------*/ - -/*---------------------------------------------------*/ -static -void makeMaps_e ( EState* s ) -{ - Int32 i; - s->nInUse = 0; - for (i = 0; i < 256; i++) - if (s->inUse[i]) { - s->unseqToSeq[i] = s->nInUse; - s->nInUse++; - } -} - - -/*---------------------------------------------------*/ -static -void generateMTFValues ( EState* s ) -{ - UChar yy[256]; - Int32 i, j; - Int32 zPend; - Int32 wr; - Int32 EOB; - - /* - After sorting (eg, here), - s->arr1 [ 0 .. s->nblock-1 ] holds sorted order, - and - ((UChar*)s->arr2) [ 0 .. s->nblock-1 ] - holds the original block data. - - The first thing to do is generate the MTF values, - and put them in - ((UInt16*)s->arr1) [ 0 .. s->nblock-1 ]. - Because there are strictly fewer or equal MTF values - than block values, ptr values in this area are overwritten - with MTF values only when they are no longer needed. - - The final compressed bitstream is generated into the - area starting at - (UChar*) (&((UChar*)s->arr2)[s->nblock]) - - These storage aliases are set up in bzCompressInit(), - except for the last one, which is arranged in - compressBlock(). - */ - UInt32* ptr = s->ptr; - UChar* block = s->block; - UInt16* mtfv = s->mtfv; - - makeMaps_e ( s ); - EOB = s->nInUse+1; - - for (i = 0; i <= EOB; i++) s->mtfFreq[i] = 0; - - wr = 0; - zPend = 0; - for (i = 0; i < s->nInUse; i++) yy[i] = (UChar) i; - - for (i = 0; i < s->nblock; i++) { - UChar ll_i; - AssertD ( wr <= i, "generateMTFValues(1)" ); - j = ptr[i]-1; if (j < 0) j += s->nblock; - ll_i = s->unseqToSeq[block[j]]; - AssertD ( ll_i < s->nInUse, "generateMTFValues(2a)" ); - - if (yy[0] == ll_i) { - zPend++; - } else { - - if (zPend > 0) { - zPend--; - while (True) { - if (zPend & 1) { - mtfv[wr] = BZ_RUNB; wr++; - s->mtfFreq[BZ_RUNB]++; - } else { - mtfv[wr] = BZ_RUNA; wr++; - s->mtfFreq[BZ_RUNA]++; - } - if (zPend < 2) break; - zPend = (zPend - 2) / 2; - }; - zPend = 0; - } - { - register UChar rtmp; - register UChar* ryy_j; - register UChar rll_i; - rtmp = yy[1]; - yy[1] = yy[0]; - ryy_j = &(yy[1]); - rll_i = ll_i; - while ( rll_i != rtmp ) { - register UChar rtmp2; - ryy_j++; - rtmp2 = rtmp; - rtmp = *ryy_j; - *ryy_j = rtmp2; - }; - yy[0] = rtmp; - j = ryy_j - &(yy[0]); - mtfv[wr] = j+1; wr++; s->mtfFreq[j+1]++; - } - - } - } - - if (zPend > 0) { - zPend--; - while (True) { - if (zPend & 1) { - mtfv[wr] = BZ_RUNB; wr++; - s->mtfFreq[BZ_RUNB]++; - } else { - mtfv[wr] = BZ_RUNA; wr++; - s->mtfFreq[BZ_RUNA]++; - } - if (zPend < 2) break; - zPend = (zPend - 2) / 2; - }; - zPend = 0; - } - - mtfv[wr] = EOB; wr++; s->mtfFreq[EOB]++; - - s->nMTF = wr; -} - - -/*---------------------------------------------------*/ -#define BZ_LESSER_ICOST 0 -#define BZ_GREATER_ICOST 15 - -static -void sendMTFValues ( EState* s ) -{ - Int32 v, t, i, j, gs, ge, totc, bt, bc, iter; - Int32 nSelectors, alphaSize, minLen, maxLen, selCtr; - Int32 nGroups, nBytes; - - /*-- - UChar len [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE]; - is a global since the decoder also needs it. - - Int32 code[BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE]; - Int32 rfreq[BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE]; - are also globals only used in this proc. - Made global to keep stack frame size small. - --*/ - - - UInt16 cost[BZ_N_GROUPS]; - Int32 fave[BZ_N_GROUPS]; - - UInt16* mtfv = s->mtfv; - - if (s->verbosity >= 3) - VPrintf3( " %d in block, %d after MTF & 1-2 coding, " - "%d+2 syms in use\n", - s->nblock, s->nMTF, s->nInUse ); - - alphaSize = s->nInUse+2; - for (t = 0; t < BZ_N_GROUPS; t++) - for (v = 0; v < alphaSize; v++) - s->len[t][v] = BZ_GREATER_ICOST; - - /*--- Decide how many coding tables to use ---*/ - AssertH ( s->nMTF > 0, 3001 ); - if (s->nMTF < 200) nGroups = 2; else - if (s->nMTF < 600) nGroups = 3; else - if (s->nMTF < 1200) nGroups = 4; else - if (s->nMTF < 2400) nGroups = 5; else - nGroups = 6; - - /*--- Generate an initial set of coding tables ---*/ - { - Int32 nPart, remF, tFreq, aFreq; - - nPart = nGroups; - remF = s->nMTF; - gs = 0; - while (nPart > 0) { - tFreq = remF / nPart; - ge = gs-1; - aFreq = 0; - while (aFreq < tFreq && ge < alphaSize-1) { - ge++; - aFreq += s->mtfFreq[ge]; - } - - if (ge > gs - && nPart != nGroups && nPart != 1 - && ((nGroups-nPart) % 2 == 1)) { - aFreq -= s->mtfFreq[ge]; - ge--; - } - - if (s->verbosity >= 3) - VPrintf5( " initial group %d, [%d .. %d], " - "has %d syms (%4.1f%%)\n", - nPart, gs, ge, aFreq, - (100.0 * (float)aFreq) / (float)(s->nMTF) ); - - for (v = 0; v < alphaSize; v++) - if (v >= gs && v <= ge) - s->len[nPart-1][v] = BZ_LESSER_ICOST; else - s->len[nPart-1][v] = BZ_GREATER_ICOST; - - nPart--; - gs = ge+1; - remF -= aFreq; - } - } - - /*--- - Iterate up to BZ_N_ITERS times to improve the tables. - ---*/ - for (iter = 0; iter < BZ_N_ITERS; iter++) { - - for (t = 0; t < nGroups; t++) fave[t] = 0; - - for (t = 0; t < nGroups; t++) - for (v = 0; v < alphaSize; v++) - s->rfreq[t][v] = 0; - - /*--- - Set up an auxiliary length table which is used to fast-track - the common case (nGroups == 6). - ---*/ - if (nGroups == 6) { - for (v = 0; v < alphaSize; v++) { - s->len_pack[v][0] = (s->len[1][v] << 16) | s->len[0][v]; - s->len_pack[v][1] = (s->len[3][v] << 16) | s->len[2][v]; - s->len_pack[v][2] = (s->len[5][v] << 16) | s->len[4][v]; - } - } - - nSelectors = 0; - totc = 0; - gs = 0; - while (True) { - - /*--- Set group start & end marks. --*/ - if (gs >= s->nMTF) break; - ge = gs + BZ_G_SIZE - 1; - if (ge >= s->nMTF) ge = s->nMTF-1; - - /*-- - Calculate the cost of this group as coded - by each of the coding tables. - --*/ - for (t = 0; t < nGroups; t++) cost[t] = 0; - - if (nGroups == 6 && 50 == ge-gs+1) { - /*--- fast track the common case ---*/ - register UInt32 cost01, cost23, cost45; - register UInt16 icv; - cost01 = cost23 = cost45 = 0; - -# define BZ_ITER(nn) \ - icv = mtfv[gs+(nn)]; \ - cost01 += s->len_pack[icv][0]; \ - cost23 += s->len_pack[icv][1]; \ - cost45 += s->len_pack[icv][2]; \ - - BZ_ITER(0); BZ_ITER(1); BZ_ITER(2); BZ_ITER(3); BZ_ITER(4); - BZ_ITER(5); BZ_ITER(6); BZ_ITER(7); BZ_ITER(8); BZ_ITER(9); - BZ_ITER(10); BZ_ITER(11); BZ_ITER(12); BZ_ITER(13); BZ_ITER(14); - BZ_ITER(15); BZ_ITER(16); BZ_ITER(17); BZ_ITER(18); BZ_ITER(19); - BZ_ITER(20); BZ_ITER(21); BZ_ITER(22); BZ_ITER(23); BZ_ITER(24); - BZ_ITER(25); BZ_ITER(26); BZ_ITER(27); BZ_ITER(28); BZ_ITER(29); - BZ_ITER(30); BZ_ITER(31); BZ_ITER(32); BZ_ITER(33); BZ_ITER(34); - BZ_ITER(35); BZ_ITER(36); BZ_ITER(37); BZ_ITER(38); BZ_ITER(39); - BZ_ITER(40); BZ_ITER(41); BZ_ITER(42); BZ_ITER(43); BZ_ITER(44); - BZ_ITER(45); BZ_ITER(46); BZ_ITER(47); BZ_ITER(48); BZ_ITER(49); - -# undef BZ_ITER - - cost[0] = cost01 & 0xffff; cost[1] = cost01 >> 16; - cost[2] = cost23 & 0xffff; cost[3] = cost23 >> 16; - cost[4] = cost45 & 0xffff; cost[5] = cost45 >> 16; - - } else { - /*--- slow version which correctly handles all situations ---*/ - for (i = gs; i <= ge; i++) { - UInt16 icv = mtfv[i]; - for (t = 0; t < nGroups; t++) cost[t] += s->len[t][icv]; - } - } - - /*-- - Find the coding table which is best for this group, - and record its identity in the selector table. - --*/ - bc = 999999999; bt = -1; - for (t = 0; t < nGroups; t++) - if (cost[t] < bc) { bc = cost[t]; bt = t; }; - totc += bc; - fave[bt]++; - s->selector[nSelectors] = bt; - nSelectors++; - - /*-- - Increment the symbol frequencies for the selected table. - --*/ - if (nGroups == 6 && 50 == ge-gs+1) { - /*--- fast track the common case ---*/ - -# define BZ_ITUR(nn) s->rfreq[bt][ mtfv[gs+(nn)] ]++ - - BZ_ITUR(0); BZ_ITUR(1); BZ_ITUR(2); BZ_ITUR(3); BZ_ITUR(4); - BZ_ITUR(5); BZ_ITUR(6); BZ_ITUR(7); BZ_ITUR(8); BZ_ITUR(9); - BZ_ITUR(10); BZ_ITUR(11); BZ_ITUR(12); BZ_ITUR(13); BZ_ITUR(14); - BZ_ITUR(15); BZ_ITUR(16); BZ_ITUR(17); BZ_ITUR(18); BZ_ITUR(19); - BZ_ITUR(20); BZ_ITUR(21); BZ_ITUR(22); BZ_ITUR(23); BZ_ITUR(24); - BZ_ITUR(25); BZ_ITUR(26); BZ_ITUR(27); BZ_ITUR(28); BZ_ITUR(29); - BZ_ITUR(30); BZ_ITUR(31); BZ_ITUR(32); BZ_ITUR(33); BZ_ITUR(34); - BZ_ITUR(35); BZ_ITUR(36); BZ_ITUR(37); BZ_ITUR(38); BZ_ITUR(39); - BZ_ITUR(40); BZ_ITUR(41); BZ_ITUR(42); BZ_ITUR(43); BZ_ITUR(44); - BZ_ITUR(45); BZ_ITUR(46); BZ_ITUR(47); BZ_ITUR(48); BZ_ITUR(49); - -# undef BZ_ITUR - - } else { - /*--- slow version which correctly handles all situations ---*/ - for (i = gs; i <= ge; i++) - s->rfreq[bt][ mtfv[i] ]++; - } - - gs = ge+1; - } - if (s->verbosity >= 3) { - VPrintf2 ( " pass %d: size is %d, grp uses are ", - iter+1, totc/8 ); - for (t = 0; t < nGroups; t++) - VPrintf1 ( "%d ", fave[t] ); - VPrintf0 ( "\n" ); - } - - /*-- - Recompute the tables based on the accumulated frequencies. - --*/ - for (t = 0; t < nGroups; t++) - BZ2_hbMakeCodeLengths ( &(s->len[t][0]), &(s->rfreq[t][0]), - alphaSize, 20 ); - } - - - AssertH( nGroups < 8, 3002 ); - AssertH( nSelectors < 32768 && - nSelectors <= (2 + (900000 / BZ_G_SIZE)), - 3003 ); - - - /*--- Compute MTF values for the selectors. ---*/ - { - UChar pos[BZ_N_GROUPS], ll_i, tmp2, tmp; - for (i = 0; i < nGroups; i++) pos[i] = i; - for (i = 0; i < nSelectors; i++) { - ll_i = s->selector[i]; - j = 0; - tmp = pos[j]; - while ( ll_i != tmp ) { - j++; - tmp2 = tmp; - tmp = pos[j]; - pos[j] = tmp2; - }; - pos[0] = tmp; - s->selectorMtf[i] = j; - } - }; - - /*--- Assign actual codes for the tables. --*/ - for (t = 0; t < nGroups; t++) { - minLen = 32; - maxLen = 0; - for (i = 0; i < alphaSize; i++) { - if (s->len[t][i] > maxLen) maxLen = s->len[t][i]; - if (s->len[t][i] < minLen) minLen = s->len[t][i]; - } - AssertH ( !(maxLen > 20), 3004 ); - AssertH ( !(minLen < 1), 3005 ); - BZ2_hbAssignCodes ( &(s->code[t][0]), &(s->len[t][0]), - minLen, maxLen, alphaSize ); - } - - /*--- Transmit the mapping table. ---*/ - { - Bool inUse16[16]; - for (i = 0; i < 16; i++) { - inUse16[i] = False; - for (j = 0; j < 16; j++) - if (s->inUse[i * 16 + j]) inUse16[i] = True; - } - - nBytes = s->numZ; - for (i = 0; i < 16; i++) - if (inUse16[i]) bsW(s,1,1); else bsW(s,1,0); - - for (i = 0; i < 16; i++) - if (inUse16[i]) - for (j = 0; j < 16; j++) { - if (s->inUse[i * 16 + j]) bsW(s,1,1); else bsW(s,1,0); - } - - if (s->verbosity >= 3) - VPrintf1( " bytes: mapping %d, ", s->numZ-nBytes ); - } - - /*--- Now the selectors. ---*/ - nBytes = s->numZ; - bsW ( s, 3, nGroups ); - bsW ( s, 15, nSelectors ); - for (i = 0; i < nSelectors; i++) { - for (j = 0; j < s->selectorMtf[i]; j++) bsW(s,1,1); - bsW(s,1,0); - } - if (s->verbosity >= 3) - VPrintf1( "selectors %d, ", s->numZ-nBytes ); - - /*--- Now the coding tables. ---*/ - nBytes = s->numZ; - - for (t = 0; t < nGroups; t++) { - Int32 curr = s->len[t][0]; - bsW ( s, 5, curr ); - for (i = 0; i < alphaSize; i++) { - while (curr < s->len[t][i]) { bsW(s,2,2); curr++; /* 10 */ }; - while (curr > s->len[t][i]) { bsW(s,2,3); curr--; /* 11 */ }; - bsW ( s, 1, 0 ); - } - } - - if (s->verbosity >= 3) - VPrintf1 ( "code lengths %d, ", s->numZ-nBytes ); - - /*--- And finally, the block data proper ---*/ - nBytes = s->numZ; - selCtr = 0; - gs = 0; - while (True) { - if (gs >= s->nMTF) break; - ge = gs + BZ_G_SIZE - 1; - if (ge >= s->nMTF) ge = s->nMTF-1; - AssertH ( s->selector[selCtr] < nGroups, 3006 ); - - if (nGroups == 6 && 50 == ge-gs+1) { - /*--- fast track the common case ---*/ - UInt16 mtfv_i; - UChar* s_len_sel_selCtr - = &(s->len[s->selector[selCtr]][0]); - Int32* s_code_sel_selCtr - = &(s->code[s->selector[selCtr]][0]); - -# define BZ_ITAH(nn) \ - mtfv_i = mtfv[gs+(nn)]; \ - bsW ( s, \ - s_len_sel_selCtr[mtfv_i], \ - s_code_sel_selCtr[mtfv_i] ) - - BZ_ITAH(0); BZ_ITAH(1); BZ_ITAH(2); BZ_ITAH(3); BZ_ITAH(4); - BZ_ITAH(5); BZ_ITAH(6); BZ_ITAH(7); BZ_ITAH(8); BZ_ITAH(9); - BZ_ITAH(10); BZ_ITAH(11); BZ_ITAH(12); BZ_ITAH(13); BZ_ITAH(14); - BZ_ITAH(15); BZ_ITAH(16); BZ_ITAH(17); BZ_ITAH(18); BZ_ITAH(19); - BZ_ITAH(20); BZ_ITAH(21); BZ_ITAH(22); BZ_ITAH(23); BZ_ITAH(24); - BZ_ITAH(25); BZ_ITAH(26); BZ_ITAH(27); BZ_ITAH(28); BZ_ITAH(29); - BZ_ITAH(30); BZ_ITAH(31); BZ_ITAH(32); BZ_ITAH(33); BZ_ITAH(34); - BZ_ITAH(35); BZ_ITAH(36); BZ_ITAH(37); BZ_ITAH(38); BZ_ITAH(39); - BZ_ITAH(40); BZ_ITAH(41); BZ_ITAH(42); BZ_ITAH(43); BZ_ITAH(44); - BZ_ITAH(45); BZ_ITAH(46); BZ_ITAH(47); BZ_ITAH(48); BZ_ITAH(49); - -# undef BZ_ITAH - - } else { - /*--- slow version which correctly handles all situations ---*/ - for (i = gs; i <= ge; i++) { - bsW ( s, - s->len [s->selector[selCtr]] [mtfv[i]], - s->code [s->selector[selCtr]] [mtfv[i]] ); - } - } - - - gs = ge+1; - selCtr++; - } - AssertH( selCtr == nSelectors, 3007 ); - - if (s->verbosity >= 3) - VPrintf1( "codes %d\n", s->numZ-nBytes ); -} - - -/*---------------------------------------------------*/ -void BZ2_compressBlock ( EState* s, Bool is_last_block ) -{ - if (s->nblock > 0) { - - BZ_FINALISE_CRC ( s->blockCRC ); - s->combinedCRC = (s->combinedCRC << 1) | (s->combinedCRC >> 31); - s->combinedCRC ^= s->blockCRC; - if (s->blockNo > 1) s->numZ = 0; - - if (s->verbosity >= 2) - VPrintf4( " block %d: crc = 0x%8x, " - "combined CRC = 0x%8x, size = %d\n", - s->blockNo, s->blockCRC, s->combinedCRC, s->nblock ); - - BZ2_blockSort ( s ); - } - - s->zbits = (UChar*) (&((UChar*)s->arr2)[s->nblock]); - - /*-- If this is the first block, create the stream header. --*/ - if (s->blockNo == 1) { - BZ2_bsInitWrite ( s ); - bsPutUChar ( s, 'B' ); - bsPutUChar ( s, 'Z' ); - bsPutUChar ( s, 'h' ); - bsPutUChar ( s, (UChar)('0' + s->blockSize100k) ); - } - - if (s->nblock > 0) { - - bsPutUChar ( s, 0x31 ); bsPutUChar ( s, 0x41 ); - bsPutUChar ( s, 0x59 ); bsPutUChar ( s, 0x26 ); - bsPutUChar ( s, 0x53 ); bsPutUChar ( s, 0x59 ); - - /*-- Now the block's CRC, so it is in a known place. --*/ - bsPutUInt32 ( s, s->blockCRC ); - - /*-- - Now a single bit indicating (non-)randomisation. - As of version 0.9.5, we use a better sorting algorithm - which makes randomisation unnecessary. So always set - the randomised bit to 'no'. Of course, the decoder - still needs to be able to handle randomised blocks - so as to maintain backwards compatibility with - older versions of bzip2. - --*/ - bsW(s,1,0); - - bsW ( s, 24, s->origPtr ); - generateMTFValues ( s ); - sendMTFValues ( s ); - } - - - /*-- If this is the last block, add the stream trailer. --*/ - if (is_last_block) { - - bsPutUChar ( s, 0x17 ); bsPutUChar ( s, 0x72 ); - bsPutUChar ( s, 0x45 ); bsPutUChar ( s, 0x38 ); - bsPutUChar ( s, 0x50 ); bsPutUChar ( s, 0x90 ); - bsPutUInt32 ( s, s->combinedCRC ); - if (s->verbosity >= 2) - VPrintf1( " final combined CRC = 0x%x\n ", s->combinedCRC ); - bsFinishWrite ( s ); - } -} - - -/*-------------------------------------------------------------*/ -/*--- end compress.c ---*/ -/*-------------------------------------------------------------*/ diff --git a/winsup/bz2lib/configure b/winsup/bz2lib/configure deleted file mode 100755 index c45c700..0000000 --- a/winsup/bz2lib/configure +++ /dev/null @@ -1,1896 +0,0 @@ -#! /bin/sh - -# Guess values for system-dependent variables and create Makefiles. -# Generated automatically using autoconf version 2.13 -# Copyright (C) 1992, 93, 94, 95, 96 Free Software Foundation, Inc. -# -# This configure script is free software; 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This is -# copied from autoconf 2.12, but does not call AC_PROG_CC_WORKS. We -# are probably using a cross compiler, which will not be able to fully -# link an executable. This should really be fixed in autoconf -# itself. - -AC_DEFUN(LIB_AC_PROG_CC, -[AC_BEFORE([$0], [AC_PROG_CPP])dnl -AC_CHECK_TOOL(CC, gcc, gcc) -if test -z "$CC"; then - AC_CHECK_PROG(CC, cc, cc, , , /usr/ucb/cc) - test -z "$CC" && AC_MSG_ERROR([no acceptable cc found in \$PATH]) -fi - -AC_PROG_CC_GNU - -if test $ac_cv_prog_gcc = yes; then - GCC=yes -dnl Check whether -g works, even if CFLAGS is set, in case the package -dnl plays around with CFLAGS (such as to build both debugging and -dnl normal versions of a library), tasteless as that idea is. - ac_test_CFLAGS="${CFLAGS+set}" - ac_save_CFLAGS="$CFLAGS" - CFLAGS= - AC_PROG_CC_G - if test "$ac_test_CFLAGS" = set; then - CFLAGS="$ac_save_CFLAGS" - elif test $ac_cv_prog_cc_g = yes; then - CFLAGS="-gstabs+ -O2" - else - CFLAGS="-O2" - fi - if test "$ac_test_CXXFLAGS" != set; then - CXXFLAGS='$(CFLAGS)' - fi -else - GCC= - test "${CFLAGS+set}" = set || CFLAGS="-g" -fi -]) - -CPPFLAGS=-U_WIN32 -AC_CANONICAL_HOST -AC_CHECK_TOOL(AR, ar, ar) -AC_CHECK_TOOL(NM, nm, nm) -AC_CHECK_TOOL(RANLIB, ranlib, ranlib) -LIB_AC_PROG_CC -AC_PROG_INSTALL -AC_STDC_HEADERS -AC_EXEEXT -AC_OBJEXT - -AC_SUBST(installdata)dnl -AC_SUBST(uninstalldata)dnl - -AC_OUTPUT([Makefile]) diff --git a/winsup/bz2lib/crctable.c b/winsup/bz2lib/crctable.c deleted file mode 100644 index 61c040c..0000000 --- a/winsup/bz2lib/crctable.c +++ /dev/null @@ -1,144 +0,0 @@ - -/*-------------------------------------------------------------*/ -/*--- Table for doing CRCs ---*/ -/*--- crctable.c ---*/ -/*-------------------------------------------------------------*/ - -/*-- - This file is a part of bzip2 and/or libbzip2, a program and - library for lossless, block-sorting data compression. - - Copyright (C) 1996-2000 Julian R Seward. All rights reserved. - - Redistribution and use in source and binary forms, with or without - modification, are permitted provided that the following conditions - are met: - - 1. Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - - 2. The origin of this software must not be misrepresented; you must - not claim that you wrote the original software. If you use this - software in a product, an acknowledgment in the product - documentation would be appreciated but is not required. - - 3. Altered source versions must be plainly marked as such, and must - not be misrepresented as being the original software. - - 4. The name of the author may not be used to endorse or promote - products derived from this software without specific prior written - permission. - - THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS - OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED - WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY - DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE - GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS - INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, - WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING - NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS - SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - - Julian Seward, Cambridge, UK. - jseward@acm.org - bzip2/libbzip2 version 1.0 of 21 March 2000 - - This program is based on (at least) the work of: - Mike Burrows - David Wheeler - Peter Fenwick - Alistair Moffat - Radford Neal - Ian H. Witten - Robert Sedgewick - Jon L. Bentley - - For more information on these sources, see the manual. ---*/ - - -#include "bzlib_private.h" - -/*-- - I think this is an implementation of the AUTODIN-II, - Ethernet & FDDI 32-bit CRC standard. Vaguely derived - from code by Rob Warnock, in Section 51 of the - comp.compression FAQ. ---*/ - -UInt32 BZ2_crc32Table[256] = { - - /*-- Ugly, innit? --*/ - - 0x00000000L, 0x04c11db7L, 0x09823b6eL, 0x0d4326d9L, - 0x130476dcL, 0x17c56b6bL, 0x1a864db2L, 0x1e475005L, - 0x2608edb8L, 0x22c9f00fL, 0x2f8ad6d6L, 0x2b4bcb61L, - 0x350c9b64L, 0x31cd86d3L, 0x3c8ea00aL, 0x384fbdbdL, - 0x4c11db70L, 0x48d0c6c7L, 0x4593e01eL, 0x4152fda9L, - 0x5f15adacL, 0x5bd4b01bL, 0x569796c2L, 0x52568b75L, - 0x6a1936c8L, 0x6ed82b7fL, 0x639b0da6L, 0x675a1011L, - 0x791d4014L, 0x7ddc5da3L, 0x709f7b7aL, 0x745e66cdL, - 0x9823b6e0L, 0x9ce2ab57L, 0x91a18d8eL, 0x95609039L, - 0x8b27c03cL, 0x8fe6dd8bL, 0x82a5fb52L, 0x8664e6e5L, - 0xbe2b5b58L, 0xbaea46efL, 0xb7a96036L, 0xb3687d81L, - 0xad2f2d84L, 0xa9ee3033L, 0xa4ad16eaL, 0xa06c0b5dL, - 0xd4326d90L, 0xd0f37027L, 0xddb056feL, 0xd9714b49L, - 0xc7361b4cL, 0xc3f706fbL, 0xceb42022L, 0xca753d95L, - 0xf23a8028L, 0xf6fb9d9fL, 0xfbb8bb46L, 0xff79a6f1L, - 0xe13ef6f4L, 0xe5ffeb43L, 0xe8bccd9aL, 0xec7dd02dL, - 0x34867077L, 0x30476dc0L, 0x3d044b19L, 0x39c556aeL, - 0x278206abL, 0x23431b1cL, 0x2e003dc5L, 0x2ac12072L, - 0x128e9dcfL, 0x164f8078L, 0x1b0ca6a1L, 0x1fcdbb16L, - 0x018aeb13L, 0x054bf6a4L, 0x0808d07dL, 0x0cc9cdcaL, - 0x7897ab07L, 0x7c56b6b0L, 0x71159069L, 0x75d48ddeL, - 0x6b93dddbL, 0x6f52c06cL, 0x6211e6b5L, 0x66d0fb02L, - 0x5e9f46bfL, 0x5a5e5b08L, 0x571d7dd1L, 0x53dc6066L, - 0x4d9b3063L, 0x495a2dd4L, 0x44190b0dL, 0x40d816baL, - 0xaca5c697L, 0xa864db20L, 0xa527fdf9L, 0xa1e6e04eL, - 0xbfa1b04bL, 0xbb60adfcL, 0xb6238b25L, 0xb2e29692L, - 0x8aad2b2fL, 0x8e6c3698L, 0x832f1041L, 0x87ee0df6L, - 0x99a95df3L, 0x9d684044L, 0x902b669dL, 0x94ea7b2aL, - 0xe0b41de7L, 0xe4750050L, 0xe9362689L, 0xedf73b3eL, - 0xf3b06b3bL, 0xf771768cL, 0xfa325055L, 0xfef34de2L, - 0xc6bcf05fL, 0xc27dede8L, 0xcf3ecb31L, 0xcbffd686L, - 0xd5b88683L, 0xd1799b34L, 0xdc3abdedL, 0xd8fba05aL, - 0x690ce0eeL, 0x6dcdfd59L, 0x608edb80L, 0x644fc637L, - 0x7a089632L, 0x7ec98b85L, 0x738aad5cL, 0x774bb0ebL, - 0x4f040d56L, 0x4bc510e1L, 0x46863638L, 0x42472b8fL, - 0x5c007b8aL, 0x58c1663dL, 0x558240e4L, 0x51435d53L, - 0x251d3b9eL, 0x21dc2629L, 0x2c9f00f0L, 0x285e1d47L, - 0x36194d42L, 0x32d850f5L, 0x3f9b762cL, 0x3b5a6b9bL, - 0x0315d626L, 0x07d4cb91L, 0x0a97ed48L, 0x0e56f0ffL, - 0x1011a0faL, 0x14d0bd4dL, 0x19939b94L, 0x1d528623L, - 0xf12f560eL, 0xf5ee4bb9L, 0xf8ad6d60L, 0xfc6c70d7L, - 0xe22b20d2L, 0xe6ea3d65L, 0xeba91bbcL, 0xef68060bL, - 0xd727bbb6L, 0xd3e6a601L, 0xdea580d8L, 0xda649d6fL, - 0xc423cd6aL, 0xc0e2d0ddL, 0xcda1f604L, 0xc960ebb3L, - 0xbd3e8d7eL, 0xb9ff90c9L, 0xb4bcb610L, 0xb07daba7L, - 0xae3afba2L, 0xaafbe615L, 0xa7b8c0ccL, 0xa379dd7bL, - 0x9b3660c6L, 0x9ff77d71L, 0x92b45ba8L, 0x9675461fL, - 0x8832161aL, 0x8cf30badL, 0x81b02d74L, 0x857130c3L, - 0x5d8a9099L, 0x594b8d2eL, 0x5408abf7L, 0x50c9b640L, - 0x4e8ee645L, 0x4a4ffbf2L, 0x470cdd2bL, 0x43cdc09cL, - 0x7b827d21L, 0x7f436096L, 0x7200464fL, 0x76c15bf8L, - 0x68860bfdL, 0x6c47164aL, 0x61043093L, 0x65c52d24L, - 0x119b4be9L, 0x155a565eL, 0x18197087L, 0x1cd86d30L, - 0x029f3d35L, 0x065e2082L, 0x0b1d065bL, 0x0fdc1becL, - 0x3793a651L, 0x3352bbe6L, 0x3e119d3fL, 0x3ad08088L, - 0x2497d08dL, 0x2056cd3aL, 0x2d15ebe3L, 0x29d4f654L, - 0xc5a92679L, 0xc1683bceL, 0xcc2b1d17L, 0xc8ea00a0L, - 0xd6ad50a5L, 0xd26c4d12L, 0xdf2f6bcbL, 0xdbee767cL, - 0xe3a1cbc1L, 0xe760d676L, 0xea23f0afL, 0xeee2ed18L, - 0xf0a5bd1dL, 0xf464a0aaL, 0xf9278673L, 0xfde69bc4L, - 0x89b8fd09L, 0x8d79e0beL, 0x803ac667L, 0x84fbdbd0L, - 0x9abc8bd5L, 0x9e7d9662L, 0x933eb0bbL, 0x97ffad0cL, - 0xafb010b1L, 0xab710d06L, 0xa6322bdfL, 0xa2f33668L, - 0xbcb4666dL, 0xb8757bdaL, 0xb5365d03L, 0xb1f740b4L -}; - - -/*-------------------------------------------------------------*/ -/*--- end crctable.c ---*/ -/*-------------------------------------------------------------*/ diff --git a/winsup/bz2lib/decompress.c b/winsup/bz2lib/decompress.c deleted file mode 100644 index cdced18..0000000 --- a/winsup/bz2lib/decompress.c +++ /dev/null @@ -1,660 +0,0 @@ - -/*-------------------------------------------------------------*/ -/*--- Decompression machinery ---*/ -/*--- decompress.c ---*/ -/*-------------------------------------------------------------*/ - -/*-- - This file is a part of bzip2 and/or libbzip2, a program and - library for lossless, block-sorting data compression. - - Copyright (C) 1996-2000 Julian R Seward. All rights reserved. - - Redistribution and use in source and binary forms, with or without - modification, are permitted provided that the following conditions - are met: - - 1. Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - - 2. The origin of this software must not be misrepresented; you must - not claim that you wrote the original software. If you use this - software in a product, an acknowledgment in the product - documentation would be appreciated but is not required. - - 3. Altered source versions must be plainly marked as such, and must - not be misrepresented as being the original software. - - 4. The name of the author may not be used to endorse or promote - products derived from this software without specific prior written - permission. - - THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS - OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED - WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY - DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE - GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS - INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, - WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING - NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS - SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - - Julian Seward, Cambridge, UK. - jseward@acm.org - bzip2/libbzip2 version 1.0 of 21 March 2000 - - This program is based on (at least) the work of: - Mike Burrows - David Wheeler - Peter Fenwick - Alistair Moffat - Radford Neal - Ian H. Witten - Robert Sedgewick - Jon L. Bentley - - For more information on these sources, see the manual. ---*/ - - -#include "bzlib_private.h" - - -/*---------------------------------------------------*/ -static -void makeMaps_d ( DState* s ) -{ - Int32 i; - s->nInUse = 0; - for (i = 0; i < 256; i++) - if (s->inUse[i]) { - s->seqToUnseq[s->nInUse] = i; - s->nInUse++; - } -} - - -/*---------------------------------------------------*/ -#define RETURN(rrr) \ - { retVal = rrr; goto save_state_and_return; }; - -#define GET_BITS(lll,vvv,nnn) \ - case lll: s->state = lll; \ - while (True) { \ - if (s->bsLive >= nnn) { \ - UInt32 v; \ - v = (s->bsBuff >> \ - (s->bsLive-nnn)) & ((1 << nnn)-1); \ - s->bsLive -= nnn; \ - vvv = v; \ - break; \ - } \ - if (s->strm->avail_in == 0) RETURN(BZ_OK); \ - s->bsBuff \ - = (s->bsBuff << 8) | \ - ((UInt32) \ - (*((UChar*)(s->strm->next_in)))); \ - s->bsLive += 8; \ - s->strm->next_in++; \ - s->strm->avail_in--; \ - s->strm->total_in_lo32++; \ - if (s->strm->total_in_lo32 == 0) \ - s->strm->total_in_hi32++; \ - } - -#define GET_UCHAR(lll,uuu) \ - GET_BITS(lll,uuu,8) - -#define GET_BIT(lll,uuu) \ - GET_BITS(lll,uuu,1) - -/*---------------------------------------------------*/ -#define GET_MTF_VAL(label1,label2,lval) \ -{ \ - if (groupPos == 0) { \ - groupNo++; \ - if (groupNo >= nSelectors) \ - RETURN(BZ_DATA_ERROR); \ - groupPos = BZ_G_SIZE; \ - gSel = s->selector[groupNo]; \ - gMinlen = s->minLens[gSel]; \ - gLimit = &(s->limit[gSel][0]); \ - gPerm = &(s->perm[gSel][0]); \ - gBase = &(s->base[gSel][0]); \ - } \ - groupPos--; \ - zn = gMinlen; \ - GET_BITS(label1, zvec, zn); \ - while (1) { \ - if (zn > 20 /* the longest code */) \ - RETURN(BZ_DATA_ERROR); \ - if (zvec <= gLimit[zn]) break; \ - zn++; \ - GET_BIT(label2, zj); \ - zvec = (zvec << 1) | zj; \ - }; \ - if (zvec - gBase[zn] < 0 \ - || zvec - gBase[zn] >= BZ_MAX_ALPHA_SIZE) \ - RETURN(BZ_DATA_ERROR); \ - lval = gPerm[zvec - gBase[zn]]; \ -} - - -/*---------------------------------------------------*/ -Int32 BZ2_decompress ( DState* s ) -{ - UChar uc; - Int32 retVal; - Int32 minLen, maxLen; - bz_stream* strm = s->strm; - - /* stuff that needs to be saved/restored */ - Int32 i; - Int32 j; - Int32 t; - Int32 alphaSize; - Int32 nGroups; - Int32 nSelectors; - Int32 EOB; - Int32 groupNo; - Int32 groupPos; - Int32 nextSym; - Int32 nblockMAX; - Int32 nblock; - Int32 es; - Int32 N; - Int32 curr; - Int32 zt; - Int32 zn; - Int32 zvec; - Int32 zj; - Int32 gSel; - Int32 gMinlen; - Int32* gLimit; - Int32* gBase; - Int32* gPerm; - - if (s->state == BZ_X_MAGIC_1) { - /*initialise the save area*/ - s->save_i = 0; - s->save_j = 0; - s->save_t = 0; - s->save_alphaSize = 0; - s->save_nGroups = 0; - s->save_nSelectors = 0; - s->save_EOB = 0; - s->save_groupNo = 0; - s->save_groupPos = 0; - s->save_nextSym = 0; - s->save_nblockMAX = 0; - s->save_nblock = 0; - s->save_es = 0; - s->save_N = 0; - s->save_curr = 0; - s->save_zt = 0; - s->save_zn = 0; - s->save_zvec = 0; - s->save_zj = 0; - s->save_gSel = 0; - s->save_gMinlen = 0; - s->save_gLimit = NULL; - s->save_gBase = NULL; - s->save_gPerm = NULL; - } - - /*restore from the save area*/ - i = s->save_i; - j = s->save_j; - t = s->save_t; - alphaSize = s->save_alphaSize; - nGroups = s->save_nGroups; - nSelectors = s->save_nSelectors; - EOB = s->save_EOB; - groupNo = s->save_groupNo; - groupPos = s->save_groupPos; - nextSym = s->save_nextSym; - nblockMAX = s->save_nblockMAX; - nblock = s->save_nblock; - es = s->save_es; - N = s->save_N; - curr = s->save_curr; - zt = s->save_zt; - zn = s->save_zn; - zvec = s->save_zvec; - zj = s->save_zj; - gSel = s->save_gSel; - gMinlen = s->save_gMinlen; - gLimit = s->save_gLimit; - gBase = s->save_gBase; - gPerm = s->save_gPerm; - - retVal = BZ_OK; - - switch (s->state) { - - GET_UCHAR(BZ_X_MAGIC_1, uc); - if (uc != 'B') RETURN(BZ_DATA_ERROR_MAGIC); - - GET_UCHAR(BZ_X_MAGIC_2, uc); - if (uc != 'Z') RETURN(BZ_DATA_ERROR_MAGIC); - - GET_UCHAR(BZ_X_MAGIC_3, uc) - if (uc != 'h') RETURN(BZ_DATA_ERROR_MAGIC); - - GET_BITS(BZ_X_MAGIC_4, s->blockSize100k, 8) - if (s->blockSize100k < '1' || - s->blockSize100k > '9') RETURN(BZ_DATA_ERROR_MAGIC); - s->blockSize100k -= '0'; - - if (s->smallDecompress) { - s->ll16 = BZALLOC( s->blockSize100k * 100000 * sizeof(UInt16) ); - s->ll4 = BZALLOC( - ((1 + s->blockSize100k * 100000) >> 1) * sizeof(UChar) - ); - if (s->ll16 == NULL || s->ll4 == NULL) RETURN(BZ_MEM_ERROR); - } else { - s->tt = BZALLOC( s->blockSize100k * 100000 * sizeof(Int32) ); - if (s->tt == NULL) RETURN(BZ_MEM_ERROR); - } - - GET_UCHAR(BZ_X_BLKHDR_1, uc); - - if (uc == 0x17) goto endhdr_2; - if (uc != 0x31) RETURN(BZ_DATA_ERROR); - GET_UCHAR(BZ_X_BLKHDR_2, uc); - if (uc != 0x41) RETURN(BZ_DATA_ERROR); - GET_UCHAR(BZ_X_BLKHDR_3, uc); - if (uc != 0x59) RETURN(BZ_DATA_ERROR); - GET_UCHAR(BZ_X_BLKHDR_4, uc); - if (uc != 0x26) RETURN(BZ_DATA_ERROR); - GET_UCHAR(BZ_X_BLKHDR_5, uc); - if (uc != 0x53) RETURN(BZ_DATA_ERROR); - GET_UCHAR(BZ_X_BLKHDR_6, uc); - if (uc != 0x59) RETURN(BZ_DATA_ERROR); - - s->currBlockNo++; - if (s->verbosity >= 2) - VPrintf1 ( "\n [%d: huff+mtf ", s->currBlockNo ); - - s->storedBlockCRC = 0; - GET_UCHAR(BZ_X_BCRC_1, uc); - s->storedBlockCRC = (s->storedBlockCRC << 8) | ((UInt32)uc); - GET_UCHAR(BZ_X_BCRC_2, uc); - s->storedBlockCRC = (s->storedBlockCRC << 8) | ((UInt32)uc); - GET_UCHAR(BZ_X_BCRC_3, uc); - s->storedBlockCRC = (s->storedBlockCRC << 8) | ((UInt32)uc); - GET_UCHAR(BZ_X_BCRC_4, uc); - s->storedBlockCRC = (s->storedBlockCRC << 8) | ((UInt32)uc); - - GET_BITS(BZ_X_RANDBIT, s->blockRandomised, 1); - - s->origPtr = 0; - GET_UCHAR(BZ_X_ORIGPTR_1, uc); - s->origPtr = (s->origPtr << 8) | ((Int32)uc); - GET_UCHAR(BZ_X_ORIGPTR_2, uc); - s->origPtr = (s->origPtr << 8) | ((Int32)uc); - GET_UCHAR(BZ_X_ORIGPTR_3, uc); - s->origPtr = (s->origPtr << 8) | ((Int32)uc); - - if (s->origPtr < 0) - RETURN(BZ_DATA_ERROR); - if (s->origPtr > 10 + 100000*s->blockSize100k) - RETURN(BZ_DATA_ERROR); - - /*--- Receive the mapping table ---*/ - for (i = 0; i < 16; i++) { - GET_BIT(BZ_X_MAPPING_1, uc); - if (uc == 1) - s->inUse16[i] = True; else - s->inUse16[i] = False; - } - - for (i = 0; i < 256; i++) s->inUse[i] = False; - - for (i = 0; i < 16; i++) - if (s->inUse16[i]) - for (j = 0; j < 16; j++) { - GET_BIT(BZ_X_MAPPING_2, uc); - if (uc == 1) s->inUse[i * 16 + j] = True; - } - makeMaps_d ( s ); - if (s->nInUse == 0) RETURN(BZ_DATA_ERROR); - alphaSize = s->nInUse+2; - - /*--- Now the selectors ---*/ - GET_BITS(BZ_X_SELECTOR_1, nGroups, 3); - if (nGroups < 2 || nGroups > 6) RETURN(BZ_DATA_ERROR); - GET_BITS(BZ_X_SELECTOR_2, nSelectors, 15); - if (nSelectors < 1) RETURN(BZ_DATA_ERROR); - for (i = 0; i < nSelectors; i++) { - j = 0; - while (True) { - GET_BIT(BZ_X_SELECTOR_3, uc); - if (uc == 0) break; - j++; - if (j >= nGroups) RETURN(BZ_DATA_ERROR); - } - s->selectorMtf[i] = j; - } - - /*--- Undo the MTF values for the selectors. ---*/ - { - UChar pos[BZ_N_GROUPS], tmp, v; - for (v = 0; v < nGroups; v++) pos[v] = v; - - for (i = 0; i < nSelectors; i++) { - v = s->selectorMtf[i]; - tmp = pos[v]; - while (v > 0) { pos[v] = pos[v-1]; v--; } - pos[0] = tmp; - s->selector[i] = tmp; - } - } - - /*--- Now the coding tables ---*/ - for (t = 0; t < nGroups; t++) { - GET_BITS(BZ_X_CODING_1, curr, 5); - for (i = 0; i < alphaSize; i++) { - while (True) { - if (curr < 1 || curr > 20) RETURN(BZ_DATA_ERROR); - GET_BIT(BZ_X_CODING_2, uc); - if (uc == 0) break; - GET_BIT(BZ_X_CODING_3, uc); - if (uc == 0) curr++; else curr--; - } - s->len[t][i] = curr; - } - } - - /*--- Create the Huffman decoding tables ---*/ - for (t = 0; t < nGroups; t++) { - minLen = 32; - maxLen = 0; - for (i = 0; i < alphaSize; i++) { - if (s->len[t][i] > maxLen) maxLen = s->len[t][i]; - if (s->len[t][i] < minLen) minLen = s->len[t][i]; - } - BZ2_hbCreateDecodeTables ( - &(s->limit[t][0]), - &(s->base[t][0]), - &(s->perm[t][0]), - &(s->len[t][0]), - minLen, maxLen, alphaSize - ); - s->minLens[t] = minLen; - } - - /*--- Now the MTF values ---*/ - - EOB = s->nInUse+1; - nblockMAX = 100000 * s->blockSize100k; - groupNo = -1; - groupPos = 0; - - for (i = 0; i <= 255; i++) s->unzftab[i] = 0; - - /*-- MTF init --*/ - { - Int32 ii, jj, kk; - kk = MTFA_SIZE-1; - for (ii = 256 / MTFL_SIZE - 1; ii >= 0; ii--) { - for (jj = MTFL_SIZE-1; jj >= 0; jj--) { - s->mtfa[kk] = (UChar)(ii * MTFL_SIZE + jj); - kk--; - } - s->mtfbase[ii] = kk + 1; - } - } - /*-- end MTF init --*/ - - nblock = 0; - GET_MTF_VAL(BZ_X_MTF_1, BZ_X_MTF_2, nextSym); - - while (True) { - - if (nextSym == EOB) break; - - if (nextSym == BZ_RUNA || nextSym == BZ_RUNB) { - - es = -1; - N = 1; - do { - if (nextSym == BZ_RUNA) es = es + (0+1) * N; else - if (nextSym == BZ_RUNB) es = es + (1+1) * N; - N = N * 2; - GET_MTF_VAL(BZ_X_MTF_3, BZ_X_MTF_4, nextSym); - } - while (nextSym == BZ_RUNA || nextSym == BZ_RUNB); - - es++; - uc = s->seqToUnseq[ s->mtfa[s->mtfbase[0]] ]; - s->unzftab[uc] += es; - - if (s->smallDecompress) - while (es > 0) { - if (nblock >= nblockMAX) RETURN(BZ_DATA_ERROR); - s->ll16[nblock] = (UInt16)uc; - nblock++; - es--; - } - else - while (es > 0) { - if (nblock >= nblockMAX) RETURN(BZ_DATA_ERROR); - s->tt[nblock] = (UInt32)uc; - nblock++; - es--; - }; - - continue; - - } else { - - if (nblock >= nblockMAX) RETURN(BZ_DATA_ERROR); - - /*-- uc = MTF ( nextSym-1 ) --*/ - { - Int32 ii, jj, kk, pp, lno, off; - UInt32 nn; - nn = (UInt32)(nextSym - 1); - - if (nn < MTFL_SIZE) { - /* avoid general-case expense */ - pp = s->mtfbase[0]; - uc = s->mtfa[pp+nn]; - while (nn > 3) { - Int32 z = pp+nn; - s->mtfa[(z) ] = s->mtfa[(z)-1]; - s->mtfa[(z)-1] = s->mtfa[(z)-2]; - s->mtfa[(z)-2] = s->mtfa[(z)-3]; - s->mtfa[(z)-3] = s->mtfa[(z)-4]; - nn -= 4; - } - while (nn > 0) { - s->mtfa[(pp+nn)] = s->mtfa[(pp+nn)-1]; nn--; - }; - s->mtfa[pp] = uc; - } else { - /* general case */ - lno = nn / MTFL_SIZE; - off = nn % MTFL_SIZE; - pp = s->mtfbase[lno] + off; - uc = s->mtfa[pp]; - while (pp > s->mtfbase[lno]) { - s->mtfa[pp] = s->mtfa[pp-1]; pp--; - }; - s->mtfbase[lno]++; - while (lno > 0) { - s->mtfbase[lno]--; - s->mtfa[s->mtfbase[lno]] - = s->mtfa[s->mtfbase[lno-1] + MTFL_SIZE - 1]; - lno--; - } - s->mtfbase[0]--; - s->mtfa[s->mtfbase[0]] = uc; - if (s->mtfbase[0] == 0) { - kk = MTFA_SIZE-1; - for (ii = 256 / MTFL_SIZE-1; ii >= 0; ii--) { - for (jj = MTFL_SIZE-1; jj >= 0; jj--) { - s->mtfa[kk] = s->mtfa[s->mtfbase[ii] + jj]; - kk--; - } - s->mtfbase[ii] = kk + 1; - } - } - } - } - /*-- end uc = MTF ( nextSym-1 ) --*/ - - s->unzftab[s->seqToUnseq[uc]]++; - if (s->smallDecompress) - s->ll16[nblock] = (UInt16)(s->seqToUnseq[uc]); else - s->tt[nblock] = (UInt32)(s->seqToUnseq[uc]); - nblock++; - - GET_MTF_VAL(BZ_X_MTF_5, BZ_X_MTF_6, nextSym); - continue; - } - } - - /* Now we know what nblock is, we can do a better sanity - check on s->origPtr. - */ - if (s->origPtr < 0 || s->origPtr >= nblock) - RETURN(BZ_DATA_ERROR); - - s->state_out_len = 0; - s->state_out_ch = 0; - BZ_INITIALISE_CRC ( s->calculatedBlockCRC ); - s->state = BZ_X_OUTPUT; - if (s->verbosity >= 2) VPrintf0 ( "rt+rld" ); - - /*-- Set up cftab to facilitate generation of T^(-1) --*/ - s->cftab[0] = 0; - for (i = 1; i <= 256; i++) s->cftab[i] = s->unzftab[i-1]; - for (i = 1; i <= 256; i++) s->cftab[i] += s->cftab[i-1]; - - if (s->smallDecompress) { - - /*-- Make a copy of cftab, used in generation of T --*/ - for (i = 0; i <= 256; i++) s->cftabCopy[i] = s->cftab[i]; - - /*-- compute the T vector --*/ - for (i = 0; i < nblock; i++) { - uc = (UChar)(s->ll16[i]); - SET_LL(i, s->cftabCopy[uc]); - s->cftabCopy[uc]++; - } - - /*-- Compute T^(-1) by pointer reversal on T --*/ - i = s->origPtr; - j = GET_LL(i); - do { - Int32 tmp = GET_LL(j); - SET_LL(j, i); - i = j; - j = tmp; - } - while (i != s->origPtr); - - s->tPos = s->origPtr; - s->nblock_used = 0; - if (s->blockRandomised) { - BZ_RAND_INIT_MASK; - BZ_GET_SMALL(s->k0); s->nblock_used++; - BZ_RAND_UPD_MASK; s->k0 ^= BZ_RAND_MASK; - } else { - BZ_GET_SMALL(s->k0); s->nblock_used++; - } - - } else { - - /*-- compute the T^(-1) vector --*/ - for (i = 0; i < nblock; i++) { - uc = (UChar)(s->tt[i] & 0xff); - s->tt[s->cftab[uc]] |= (i << 8); - s->cftab[uc]++; - } - - s->tPos = s->tt[s->origPtr] >> 8; - s->nblock_used = 0; - if (s->blockRandomised) { - BZ_RAND_INIT_MASK; - BZ_GET_FAST(s->k0); s->nblock_used++; - BZ_RAND_UPD_MASK; s->k0 ^= BZ_RAND_MASK; - } else { - BZ_GET_FAST(s->k0); s->nblock_used++; - } - - } - - RETURN(BZ_OK); - - - - endhdr_2: - - GET_UCHAR(BZ_X_ENDHDR_2, uc); - if (uc != 0x72) RETURN(BZ_DATA_ERROR); - GET_UCHAR(BZ_X_ENDHDR_3, uc); - if (uc != 0x45) RETURN(BZ_DATA_ERROR); - GET_UCHAR(BZ_X_ENDHDR_4, uc); - if (uc != 0x38) RETURN(BZ_DATA_ERROR); - GET_UCHAR(BZ_X_ENDHDR_5, uc); - if (uc != 0x50) RETURN(BZ_DATA_ERROR); - GET_UCHAR(BZ_X_ENDHDR_6, uc); - if (uc != 0x90) RETURN(BZ_DATA_ERROR); - - s->storedCombinedCRC = 0; - GET_UCHAR(BZ_X_CCRC_1, uc); - s->storedCombinedCRC = (s->storedCombinedCRC << 8) | ((UInt32)uc); - GET_UCHAR(BZ_X_CCRC_2, uc); - s->storedCombinedCRC = (s->storedCombinedCRC << 8) | ((UInt32)uc); - GET_UCHAR(BZ_X_CCRC_3, uc); - s->storedCombinedCRC = (s->storedCombinedCRC << 8) | ((UInt32)uc); - GET_UCHAR(BZ_X_CCRC_4, uc); - s->storedCombinedCRC = (s->storedCombinedCRC << 8) | ((UInt32)uc); - - s->state = BZ_X_IDLE; - RETURN(BZ_STREAM_END); - - default: AssertH ( False, 4001 ); - } - - AssertH ( False, 4002 ); - - save_state_and_return: - - s->save_i = i; - s->save_j = j; - s->save_t = t; - s->save_alphaSize = alphaSize; - s->save_nGroups = nGroups; - s->save_nSelectors = nSelectors; - s->save_EOB = EOB; - s->save_groupNo = groupNo; - s->save_groupPos = groupPos; - s->save_nextSym = nextSym; - s->save_nblockMAX = nblockMAX; - s->save_nblock = nblock; - s->save_es = es; - s->save_N = N; - s->save_curr = curr; - s->save_zt = zt; - s->save_zn = zn; - s->save_zvec = zvec; - s->save_zj = zj; - s->save_gSel = gSel; - s->save_gMinlen = gMinlen; - s->save_gLimit = gLimit; - s->save_gBase = gBase; - s->save_gPerm = gPerm; - - return retVal; -} - - -/*-------------------------------------------------------------*/ -/*--- end decompress.c ---*/ -/*-------------------------------------------------------------*/ diff --git a/winsup/bz2lib/dlltest.c b/winsup/bz2lib/dlltest.c deleted file mode 100644 index f79279c..0000000 --- a/winsup/bz2lib/dlltest.c +++ /dev/null @@ -1,176 +0,0 @@ -/*
- minibz2
- libbz2.dll test program.
- by Yoshioka Tsuneo(QWF00133@nifty.ne.jp/tsuneo-y@is.aist-nara.ac.jp)
- This file is Public Domain.
- welcome any email to me.
-
- usage: minibz2 [-d] [-{1,2,..9}] [[srcfilename] destfilename]
-*/
-
-#define BZ_IMPORT
-#include <stdio.h>
-#include <stdlib.h>
-#include "bzlib.h"
-#ifdef _WIN32
-#include <io.h>
-#endif
-
-
-#ifdef _WIN32
-
-#define BZ2_LIBNAME "libbz2-1.0.0.DLL"
-
-#include <windows.h>
-static int BZ2DLLLoaded = 0;
-static HINSTANCE BZ2DLLhLib;
-int BZ2DLLLoadLibrary(void)
-{
- HINSTANCE hLib;
-
- if(BZ2DLLLoaded==1){return 0;}
- hLib=LoadLibrary(BZ2_LIBNAME);
- if(hLib == NULL){
- fprintf(stderr,"Can't load %s\n",BZ2_LIBNAME);
- return -1;
- }
- BZ2_bzlibVersion=GetProcAddress(hLib,"BZ2_bzlibVersion");
- BZ2_bzopen=GetProcAddress(hLib,"BZ2_bzopen");
- BZ2_bzdopen=GetProcAddress(hLib,"BZ2_bzdopen");
- BZ2_bzread=GetProcAddress(hLib,"BZ2_bzread");
- BZ2_bzwrite=GetProcAddress(hLib,"BZ2_bzwrite");
- BZ2_bzflush=GetProcAddress(hLib,"BZ2_bzflush");
- BZ2_bzclose=GetProcAddress(hLib,"BZ2_bzclose");
- BZ2_bzerror=GetProcAddress(hLib,"BZ2_bzerror");
-
- if (!BZ2_bzlibVersion || !BZ2_bzopen || !BZ2_bzdopen
- || !BZ2_bzread || !BZ2_bzwrite || !BZ2_bzflush
- || !BZ2_bzclose || !BZ2_bzerror) {
- fprintf(stderr,"GetProcAddress failed.\n");
- return -1;
- }
- BZ2DLLLoaded=1;
- BZ2DLLhLib=hLib;
- return 0;
-
-}
-int BZ2DLLFreeLibrary(void)
-{
- if(BZ2DLLLoaded==0){return 0;}
- FreeLibrary(BZ2DLLhLib);
- BZ2DLLLoaded=0;
-}
-#endif /* WIN32 */
-
-void usage(void)
-{
- puts("usage: minibz2 [-d] [-{1,2,..9}] [[srcfilename] destfilename]");
-}
-
-int main(int argc,char *argv[])
-{
- int decompress = 0;
- int level = 9;
- char *fn_r = NULL;
- char *fn_w = NULL;
-
-#ifdef _WIN32
- if(BZ2DLLLoadLibrary()<0){
- fprintf(stderr,"Loading of %s failed. Giving up.\n", BZ2_LIBNAME);
- exit(1);
- }
- printf("Loading of %s succeeded. Library version is %s.\n",
- BZ2_LIBNAME, BZ2_bzlibVersion() );
-#endif
- while(++argv,--argc){
- if(**argv =='-' || **argv=='/'){
- char *p;
-
- for(p=*argv+1;*p;p++){
- if(*p=='d'){
- decompress = 1;
- }else if('1'<=*p && *p<='9'){
- level = *p - '0';
- }else{
- usage();
- exit(1);
- }
- }
- }else{
- break;
- }
- }
- if(argc>=1){
- fn_r = *argv;
- argc--;argv++;
- }else{
- fn_r = NULL;
- }
- if(argc>=1){
- fn_w = *argv;
- argc--;argv++;
- }else{
- fn_w = NULL;
- }
- {
- int len;
- char buff[0x1000];
- char mode[10];
-
- if(decompress){
- BZFILE *BZ2fp_r = NULL;
- FILE *fp_w = NULL;
-
- if(fn_w){
- if((fp_w = fopen(fn_w,"wb"))==NULL){
- printf("can't open [%s]\n",fn_w);
- perror("reason:");
- exit(1);
- }
- }else{
- fp_w = stdout;
- }
- if((BZ2fp_r == NULL && (BZ2fp_r = BZ2_bzdopen(fileno(stdin),"rb"))==NULL)
- || (BZ2fp_r != NULL && (BZ2fp_r = BZ2_bzopen(fn_r,"rb"))==NULL)){
- printf("can't bz2openstream\n");
- exit(1);
- }
- while((len=BZ2_bzread(BZ2fp_r,buff,0x1000))>0){
- fwrite(buff,1,len,fp_w);
- }
- BZ2_bzclose(BZ2fp_r);
- if(fp_w != stdout) fclose(fp_w);
- }else{
- BZFILE *BZ2fp_w = NULL;
- FILE *fp_r = NULL;
-
- if(fn_r){
- if((fp_r = fopen(fn_r,"rb"))==NULL){
- printf("can't open [%s]\n",fn_r);
- perror("reason:");
- exit(1);
- }
- }else{
- fp_r = stdin;
- }
- mode[0]='w';
- mode[1] = '0' + level;
- mode[2] = '\0';
-
- if((fn_w == NULL && (BZ2fp_w = BZ2_bzdopen(fileno(stdout),mode))==NULL)
- || (fn_w !=NULL && (BZ2fp_w = BZ2_bzopen(fn_w,mode))==NULL)){
- printf("can't bz2openstream\n");
- exit(1);
- }
- while((len=fread(buff,1,0x1000,fp_r))>0){
- BZ2_bzwrite(BZ2fp_w,buff,len);
- }
- BZ2_bzclose(BZ2fp_w);
- if(fp_r!=stdin)fclose(fp_r);
- }
- }
-#ifdef _WIN32
- BZ2DLLFreeLibrary();
-#endif
- return 0;
-}
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diff --git a/winsup/bz2lib/huffman.c b/winsup/bz2lib/huffman.c deleted file mode 100644 index 9b446c4..0000000 --- a/winsup/bz2lib/huffman.c +++ /dev/null @@ -1,228 +0,0 @@ - -/*-------------------------------------------------------------*/ -/*--- Huffman coding low-level stuff ---*/ -/*--- huffman.c ---*/ -/*-------------------------------------------------------------*/ - -/*-- - This file is a part of bzip2 and/or libbzip2, a program and - library for lossless, block-sorting data compression. - - Copyright (C) 1996-2000 Julian R Seward. All rights reserved. - - Redistribution and use in source and binary forms, with or without - modification, are permitted provided that the following conditions - are met: - - 1. Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - - 2. The origin of this software must not be misrepresented; you must - not claim that you wrote the original software. If you use this - software in a product, an acknowledgment in the product - documentation would be appreciated but is not required. - - 3. Altered source versions must be plainly marked as such, and must - not be misrepresented as being the original software. - - 4. The name of the author may not be used to endorse or promote - products derived from this software without specific prior written - permission. - - THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS - OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED - WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY - DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE - GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS - INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, - WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING - NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS - SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - - Julian Seward, Cambridge, UK. - jseward@acm.org - bzip2/libbzip2 version 1.0 of 21 March 2000 - - This program is based on (at least) the work of: - Mike Burrows - David Wheeler - Peter Fenwick - Alistair Moffat - Radford Neal - Ian H. Witten - Robert Sedgewick - Jon L. Bentley - - For more information on these sources, see the manual. ---*/ - - -#include "bzlib_private.h" - -/*---------------------------------------------------*/ -#define WEIGHTOF(zz0) ((zz0) & 0xffffff00) -#define DEPTHOF(zz1) ((zz1) & 0x000000ff) -#define MYMAX(zz2,zz3) ((zz2) > (zz3) ? (zz2) : (zz3)) - -#define ADDWEIGHTS(zw1,zw2) \ - (WEIGHTOF(zw1)+WEIGHTOF(zw2)) | \ - (1 + MYMAX(DEPTHOF(zw1),DEPTHOF(zw2))) - -#define UPHEAP(z) \ -{ \ - Int32 zz, tmp; \ - zz = z; tmp = heap[zz]; \ - while (weight[tmp] < weight[heap[zz >> 1]]) { \ - heap[zz] = heap[zz >> 1]; \ - zz >>= 1; \ - } \ - heap[zz] = tmp; \ -} - -#define DOWNHEAP(z) \ -{ \ - Int32 zz, yy, tmp; \ - zz = z; tmp = heap[zz]; \ - while (True) { \ - yy = zz << 1; \ - if (yy > nHeap) break; \ - if (yy < nHeap && \ - weight[heap[yy+1]] < weight[heap[yy]]) \ - yy++; \ - if (weight[tmp] < weight[heap[yy]]) break; \ - heap[zz] = heap[yy]; \ - zz = yy; \ - } \ - heap[zz] = tmp; \ -} - - -/*---------------------------------------------------*/ -void BZ2_hbMakeCodeLengths ( UChar *len, - Int32 *freq, - Int32 alphaSize, - Int32 maxLen ) -{ - /*-- - Nodes and heap entries run from 1. Entry 0 - for both the heap and nodes is a sentinel. - --*/ - Int32 nNodes, nHeap, n1, n2, i, j, k; - Bool tooLong; - - Int32 heap [ BZ_MAX_ALPHA_SIZE + 2 ]; - Int32 weight [ BZ_MAX_ALPHA_SIZE * 2 ]; - Int32 parent [ BZ_MAX_ALPHA_SIZE * 2 ]; - - for (i = 0; i < alphaSize; i++) - weight[i+1] = (freq[i] == 0 ? 1 : freq[i]) << 8; - - while (True) { - - nNodes = alphaSize; - nHeap = 0; - - heap[0] = 0; - weight[0] = 0; - parent[0] = -2; - - for (i = 1; i <= alphaSize; i++) { - parent[i] = -1; - nHeap++; - heap[nHeap] = i; - UPHEAP(nHeap); - } - - AssertH( nHeap < (BZ_MAX_ALPHA_SIZE+2), 2001 ); - - while (nHeap > 1) { - n1 = heap[1]; heap[1] = heap[nHeap]; nHeap--; DOWNHEAP(1); - n2 = heap[1]; heap[1] = heap[nHeap]; nHeap--; DOWNHEAP(1); - nNodes++; - parent[n1] = parent[n2] = nNodes; - weight[nNodes] = ADDWEIGHTS(weight[n1], weight[n2]); - parent[nNodes] = -1; - nHeap++; - heap[nHeap] = nNodes; - UPHEAP(nHeap); - } - - AssertH( nNodes < (BZ_MAX_ALPHA_SIZE * 2), 2002 ); - - tooLong = False; - for (i = 1; i <= alphaSize; i++) { - j = 0; - k = i; - while (parent[k] >= 0) { k = parent[k]; j++; } - len[i-1] = j; - if (j > maxLen) tooLong = True; - } - - if (! tooLong) break; - - for (i = 1; i < alphaSize; i++) { - j = weight[i] >> 8; - j = 1 + (j / 2); - weight[i] = j << 8; - } - } -} - - -/*---------------------------------------------------*/ -void BZ2_hbAssignCodes ( Int32 *code, - UChar *length, - Int32 minLen, - Int32 maxLen, - Int32 alphaSize ) -{ - Int32 n, vec, i; - - vec = 0; - for (n = minLen; n <= maxLen; n++) { - for (i = 0; i < alphaSize; i++) - if (length[i] == n) { code[i] = vec; vec++; }; - vec <<= 1; - } -} - - -/*---------------------------------------------------*/ -void BZ2_hbCreateDecodeTables ( Int32 *limit, - Int32 *base, - Int32 *perm, - UChar *length, - Int32 minLen, - Int32 maxLen, - Int32 alphaSize ) -{ - Int32 pp, i, j, vec; - - pp = 0; - for (i = minLen; i <= maxLen; i++) - for (j = 0; j < alphaSize; j++) - if (length[j] == i) { perm[pp] = j; pp++; }; - - for (i = 0; i < BZ_MAX_CODE_LEN; i++) base[i] = 0; - for (i = 0; i < alphaSize; i++) base[length[i]+1]++; - - for (i = 1; i < BZ_MAX_CODE_LEN; i++) base[i] += base[i-1]; - - for (i = 0; i < BZ_MAX_CODE_LEN; i++) limit[i] = 0; - vec = 0; - - for (i = minLen; i <= maxLen; i++) { - vec += (base[i+1] - base[i]); - limit[i] = vec-1; - vec <<= 1; - } - for (i = minLen + 1; i <= maxLen; i++) - base[i] = ((limit[i-1] + 1) << 1) - base[i]; -} - - -/*-------------------------------------------------------------*/ -/*--- end huffman.c ---*/ -/*-------------------------------------------------------------*/ diff --git a/winsup/bz2lib/libbz2.def b/winsup/bz2lib/libbz2.def deleted file mode 100644 index 2dc0dd8..0000000 --- a/winsup/bz2lib/libbz2.def +++ /dev/null @@ -1,27 +0,0 @@ -LIBRARY LIBBZ2
-DESCRIPTION "libbzip2: library for data compression"
-EXPORTS
- BZ2_bzCompressInit
- BZ2_bzCompress
- BZ2_bzCompressEnd
- BZ2_bzDecompressInit
- BZ2_bzDecompress
- BZ2_bzDecompressEnd
- BZ2_bzReadOpen
- BZ2_bzReadClose
- BZ2_bzReadGetUnused
- BZ2_bzRead
- BZ2_bzWriteOpen
- BZ2_bzWrite
- BZ2_bzWriteClose
- BZ2_bzWriteClose64
- BZ2_bzBuffToBuffCompress
- BZ2_bzBuffToBuffDecompress
- BZ2_bzlibVersion
- BZ2_bzopen
- BZ2_bzdopen
- BZ2_bzread
- BZ2_bzwrite
- BZ2_bzflush
- BZ2_bzclose
- BZ2_bzerror
diff --git a/winsup/bz2lib/libbz2.dsp b/winsup/bz2lib/libbz2.dsp deleted file mode 100644 index a21a20f..0000000 --- a/winsup/bz2lib/libbz2.dsp +++ /dev/null @@ -1,130 +0,0 @@ -# Microsoft Developer Studio Project File - Name="libbz2" - Package Owner=<4>
-# Microsoft Developer Studio Generated Build File, Format Version 5.00
-# ** •ÒW‚µ‚È‚¢‚Å‚‚¾‚³‚¢ **
-
-# TARGTYPE "Win32 (x86) Dynamic-Link Library" 0x0102
-
-CFG=libbz2 - Win32 Debug
-!MESSAGE ‚±‚ê‚Í—LŒø‚ÈÒ²¸Ì§²Ù‚Å‚Í‚ ‚è‚Ü‚¹‚ñB ‚±‚ÌÌßÛ¼Þª¸Ä‚ðËÞÙÄÞ‚·‚邽‚ß‚É‚Í NMAKE ‚ðŽg—p‚µ‚Ä‚‚¾‚³‚¢B
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-!MESSAGE
-!MESSAGE NMAKE /f "libbz2.mak".
-!MESSAGE
-!MESSAGE NMAKE ‚ÌŽÀsŽž‚É\¬‚ðŽw’è‚Å‚«‚Ü‚·
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-!MESSAGE NMAKE /f "libbz2.mak" CFG="libbz2 - Win32 Debug"
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-!MESSAGE "libbz2 - Win32 Debug" ("Win32 (x86) Dynamic-Link Library" —p)
-!MESSAGE
-
-# Begin Project
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-# PROP Scc_LocalPath ""
-CPP=cl.exe
-MTL=midl.exe
-RSC=rc.exe
-
-!IF "$(CFG)" == "libbz2 - Win32 Release"
-
-# PROP BASE Use_MFC 0
-# PROP BASE Use_Debug_Libraries 0
-# PROP BASE Output_Dir "Release"
-# PROP BASE Intermediate_Dir "Release"
-# PROP BASE Target_Dir ""
-# PROP Use_MFC 0
-# PROP Use_Debug_Libraries 0
-# PROP Output_Dir "Release"
-# PROP Intermediate_Dir "Release"
-# PROP Ignore_Export_Lib 0
-# PROP Target_Dir ""
-# ADD BASE CPP /nologo /MT /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "_WINDOWS" /YX /FD /c
-# ADD CPP /nologo /MT /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "_WINDOWS" /YX /FD /c
-# ADD BASE MTL /nologo /D "NDEBUG" /mktyplib203 /o NUL /win32
-# ADD MTL /nologo /D "NDEBUG" /mktyplib203 /o NUL /win32
-# ADD BASE RSC /l 0x411 /d "NDEBUG"
-# ADD RSC /l 0x411 /d "NDEBUG"
-BSC32=bscmake.exe
-# ADD BASE BSC32 /nologo
-# ADD BSC32 /nologo
-LINK32=link.exe
-# ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /dll /machine:I386
-# ADD LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /dll /machine:I386 /out:"libbz2.dll"
-
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-
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-
-# Begin Target
-
-# Name "libbz2 - Win32 Release"
-# Name "libbz2 - Win32 Debug"
-# Begin Source File
-
-SOURCE=.\blocksort.c
-# End Source File
-# Begin Source File
-
-SOURCE=.\bzlib.c
-# End Source File
-# Begin Source File
-
-SOURCE=.\bzlib.h
-# End Source File
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-SOURCE=.\bzlib_private.h
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diff --git a/winsup/bz2lib/makefile.msc b/winsup/bz2lib/makefile.msc deleted file mode 100644 index 3fe4232..0000000 --- a/winsup/bz2lib/makefile.msc +++ /dev/null @@ -1,63 +0,0 @@ -# Makefile for Microsoft Visual C++ 6.0
-# usage: nmake -f makefile.msc
-# K.M. Syring (syring@gsf.de)
-# Fixed up by JRS for bzip2-0.9.5d release.
-
-CC=cl
-CFLAGS= -DWIN32 -MD -Ox -D_FILE_OFFSET_BITS=64
-
-OBJS= blocksort.obj \
- huffman.obj \
- crctable.obj \
- randtable.obj \
- compress.obj \
- decompress.obj \
- bzlib.obj
-
-all: lib bzip2 test
-
-bzip2: lib
- $(CC) $(CFLAGS) -o bzip2 bzip2.c libbz2.lib setargv.obj
- $(CC) $(CFLAGS) -o bzip2recover bzip2recover.c
-
-lib: $(OBJS)
- lib /out:libbz2.lib $(OBJS)
-
-test: bzip2
- type words1
- .\\bzip2 -1 < sample1.ref > sample1.rb2
- .\\bzip2 -2 < sample2.ref > sample2.rb2
- .\\bzip2 -3 < sample3.ref > sample3.rb2
- .\\bzip2 -d < sample1.bz2 > sample1.tst
- .\\bzip2 -d < sample2.bz2 > sample2.tst
- .\\bzip2 -ds < sample3.bz2 > sample3.tst
- @echo All six of the fc's should find no differences.
- @echo If fc finds an error on sample3.bz2, this could be
- @echo because WinZip's 'TAR file smart CR/LF conversion'
- @echo is too clever for its own good. Disable this option.
- @echo The correct size for sample3.ref is 120,244. If it
- @echo is 150,251, WinZip has messed it up.
- fc sample1.bz2 sample1.rb2
- fc sample2.bz2 sample2.rb2
- fc sample3.bz2 sample3.rb2
- fc sample1.tst sample1.ref
- fc sample2.tst sample2.ref
- fc sample3.tst sample3.ref
-
-
-
-clean:
- del *.obj
- del libbz2.lib
- del bzip2.exe
- del bzip2recover.exe
- del sample1.rb2
- del sample2.rb2
- del sample3.rb2
- del sample1.tst
- del sample2.tst
- del sample3.tst
-
-.c.obj:
- $(CC) $(CFLAGS) -c $*.c -o $*.obj
-
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-(of)h(\014le)f(names)h(to)h(accompan)m(y)h(the)e(command-line)e -(\015ags.)43 b(Eac)m(h)390 3359 y(\014le)e(is)h(replaced)g(b)m(y)g(a)h -(compressed)f(v)m(ersion)g(of)g(itself,)i(with)e(the)g(name)g -Fj(original_)390 3463 y(name.bz2)p Fl(.)49 b(Eac)m(h)34 -b(compressed)g(\014le)f(has)g(the)h(same)g(mo)s(di\014cation)e(date,)k -(p)s(ermissions,)390 3567 y(and,)24 b(when)f(p)s(ossible,)f(o)m -(wnership)f(as)j(the)f(corresp)s(onding)f(original,)h(so)g(that)h -(these)g(prop-)390 3671 y(erties)34 b(can)g(b)s(e)f(correctly)i -(restored)f(at)g(decompression)f(time.)51 b(File)34 b(name)g(handling)d -(is)390 3774 y(naiv)m(e)26 b(in)f(the)i(sense)f(that)h(there)f(is)f(no) -i(mec)m(hanism)e(for)h(preserving)f(original)f(\014le)i(names,)390 -3878 y(p)s(ermissions,)37 b(o)m(wnerships)f(or)h(dates)i(in)d -(\014lesystems)h(whic)m(h)g(lac)m(k)h(these)g(concepts,)j(or)390 -3982 y(ha)m(v)m(e)32 b(serious)d(\014le)g(name)i(length)f -(restrictions,)f(suc)m(h)h(as)h(MS-DOS.)390 4133 y Fj(bzip2)26 -b Fl(and)h Fj(bunzip2)e Fl(will)f(b)m(y)k(default)e(not)i(o)m(v)m -(erwrite)g(existing)e(\014les.)38 b(If)27 b(y)m(ou)h(w)m(an)m(t)g(this) -390 4237 y(to)j(happ)s(en,)e(sp)s(ecify)g(the)i Fj(-f)e -Fl(\015ag.)390 4388 y(If)34 b(no)h(\014le)f(names)g(are)i(sp)s -(eci\014ed,)e Fj(bzip2)f Fl(compresses)i(from)f(standard)g(input)f(to)j -(stan-)390 4491 y(dard)c(output.)49 b(In)32 b(this)g(case,)k -Fj(bzip2)31 b Fl(will)g(decline)h(to)i(write)e(compressed)h(output)g -(to)h(a)390 4595 y(terminal,)29 b(as)i(this)e(w)m(ould)g(b)s(e)h(en)m -(tirely)f(incomprehensible)e(and)j(therefore)h(p)s(oin)m(tless.)390 -4746 y Fj(bunzip2)36 b Fl(\(or)j Fj(bzip2)29 b(-d)p Fl(\))37 -b(decompresses)i(all)e(sp)s(eci\014ed)f(\014les.)63 b(Files)37 -b(whic)m(h)g(w)m(ere)i(not)390 4850 y(created)e(b)m(y)f -Fj(bzip2)f Fl(will)e(b)s(e)i(detected)j(and)d(ignored,)i(and)e(a)i(w)m -(arning)d(issued.)56 b Fj(bzip2)390 4954 y Fl(attempts)31 -b(to)f(guess)g(the)g(\014lename)f(for)h(the)g(decompressed)f(\014le)g 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y(dard)d(input)g(to)i(standard)e(output.)390 1472 -y Fj(bunzip2)k Fl(will)g(correctly)j(decompress)e(a)i(\014le)e(whic)m -(h)g(is)h(the)g(concatenation)i(of)e(t)m(w)m(o)i(or)390 -1576 y(more)j(compressed)f(\014les.)67 b(The)39 b(result)g(is)g(the)g -(concatenation)i(of)f(the)g(corresp)s(onding)390 1680 -y(uncompressed)c(\014les.)59 b(In)m(tegrit)m(y)38 b(testing)f(\()p -Fj(-t)p Fl(\))g(of)g(concatenated)i(compressed)e(\014les)f(is)390 -1784 y(also)30 b(supp)s(orted.)390 1935 y(Y)-8 b(ou)40 -b(can)g(also)f(compress)g(or)g(decompress)g(\014les)g(to)h(the)f -(standard)g(output)g(b)m(y)g(giving)390 2039 y(the)30 -b Fj(-c)g Fl(\015ag.)40 b(Multiple)28 b(\014les)h(ma)m(y)i(b)s(e)e -(compressed)h(and)f(decompressed)h(lik)m(e)f(this.)39 -b(The)390 2142 y(resulting)31 b(outputs)i(are)h(fed)f(sequen)m(tially)f -(to)i(stdout.)49 b(Compression)32 b(of)h(m)m(ultiple)e(\014les)390 -2246 y(in)24 b(this)g(manner)h(generates)h(a)g(stream)f(con)m(taining)g 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Fl(\(hop)s(efully)e(v)m(ery)k(unlik)m(ely\).)56 -b(The)36 b(c)m(hances)h(of)f(data)h(corruption)e(going)h(unde-)390 -4199 y(tected)g(is)e(microscopic,)h(ab)s(out)f(one)h(c)m(hance)g(in)f -(four)g(billion)d(for)j(eac)m(h)i(\014le)d(pro)s(cessed.)390 -4303 y(Be)38 b(a)m(w)m(are,)k(though,)d(that)f(the)g(c)m(hec)m(k)i(o)s -(ccurs)d(up)s(on)f(decompression,)j(so)f(it)f(can)h(only)390 -4407 y(tell)28 b(y)m(ou)g(that)i(something)d(is)h(wrong.)40 -b(It)28 b(can't)i(help)d(y)m(ou)i(reco)m(v)m(er)h(the)e(original)f -(uncom-)390 4511 y(pressed)h(data.)41 b(Y)-8 b(ou)30 -b(can)f(use)g Fj(bzip2recover)d Fl(to)k(try)f(to)h(reco)m(v)m(er)h -(data)f(from)e(damaged)390 4614 y(\014les.)390 4766 y(Return)22 -b(v)-5 b(alues:)37 b(0)23 b(for)g(a)g(normal)f(exit,)j(1)e(for)g(en)m -(vironmen)m(tal)f(problems)f(\(\014le)i(not)g(found,)390 -4869 y(in)m(v)-5 b(alid)30 b(\015ags,)k(I/O)f(errors,)g(&c\),)h(2)f(to) -g(indicate)f(a)h(corrupt)f(compressed)h(\014le,)f(3)i(for)e(an)390 -4973 y(in)m(ternal)d(consistency)h(error)g(\(eg,)i(bug\))e(whic)m(h)f -(caused)i Fj(bzip2)e Fl(to)i(panic.)390 5304 y Ff(OPTIONS)p -eop -%%Page: 5 6 -5 5 bop 150 -116 a Fl(Chapter)30 b(2:)41 b(Ho)m(w)31 -b(to)g(use)f Fj(bzip2)2375 b Fl(5)390 299 y Fj(-c)30 -b(--stdout)870 403 y Fl(Compress)f(or)i(decompress)f(to)h(standard)e -(output.)390 557 y Fj(-d)h(--decompress)870 661 y Fl(F)-8 -b(orce)44 b(decompression.)77 b Fj(bzip2)p Fl(,)44 b -Fj(bunzip2)d Fl(and)h Fj(bzcat)f Fl(are)i(really)f(the)870 -764 y(same)27 b(program,)h(and)e(the)i(decision)d(ab)s(out)i(what)g -(actions)g(to)h(tak)m(e)g(is)e(done)870 868 y(on)k(the)h(basis)e(of)i -(whic)m(h)e(name)h(is)g(used.)40 b(This)28 b(\015ag)j(o)m(v)m(errides)f -(that)h(mec)m(h-)870 972 y(anism,)e(and)h(forces)h(bzip2)e(to)i -(decompress.)390 1126 y Fj(-z)f(--compress)870 1230 y -Fl(The)39 b(complemen)m(t)h(to)g Fj(-d)p Fl(:)59 b(forces)40 -b(compression,)h(regardless)d(of)i(the)g(in-)870 1334 -y(v)m(ok)-5 b(ation)31 b(name.)390 1488 y Fj(-t)f(--test)8 -b Fl(Chec)m(k)33 b(in)m(tegrit)m(y)j(of)f(the)g(sp)s(eci\014ed)e -(\014le\(s\),)k(but)d(don't)h(decompress)g(them.)870 -1591 y(This)40 b(really)g(p)s(erforms)g(a)i(trial)e(decompression)h -(and)g(thro)m(ws)g(a)m(w)m(a)m(y)j(the)870 1695 y(result.)390 -1849 y Fj(-f)30 b(--force)870 1953 y Fl(F)-8 b(orce)31 -b(o)m(v)m(erwrite)f(of)g(output)f(\014les.)40 b(Normally)-8 -b(,)29 b Fj(bzip2)f Fl(will)f(not)j(o)m(v)m(erwrite)870 -2057 y(existing)e(output)g(\014les.)39 b(Also)28 b(forces)h -Fj(bzip2)e Fl(to)i(break)g(hard)e(links)f(to)k(\014les,)870 -2161 y(whic)m(h)f(it)h(otherwise)g(w)m(ouldn't)f(do.)390 -2315 y Fj(-k)h(--keep)8 b Fl(Keep)24 b(\(don't)i(delete\))h(input)d -(\014les)g(during)g(compression)h(or)h(decompression.)390 -2469 y Fj(-s)k(--small)870 2573 y Fl(Reduce)23 b(memory)f(usage,)j(for) -d(compression,)h(decompression)f(and)g(testing.)870 2676 -y(Files)f(are)i(decompressed)e(and)h(tested)h(using)e(a)h(mo)s -(di\014ed)e(algorithm)h(whic)m(h)870 2780 y(only)30 b(requires)g(2.5)j -(b)m(ytes)f(p)s(er)e(blo)s(c)m(k)h(b)m(yte.)44 b(This)30 -b(means)h(an)m(y)h(\014le)e(can)i(b)s(e)870 2884 y(decompressed)d(in)f -(2300k)j(of)e(memory)-8 b(,)30 b(alb)s(eit)e(at)i(ab)s(out)f(half)g -(the)g(normal)870 2988 y(sp)s(eed.)870 3117 y(During)42 -b(compression,)k Fj(-s)d Fl(selects)h(a)g(blo)s(c)m(k)g(size)f(of)h -(200k,)k(whic)m(h)42 b(lim-)870 3220 y(its)33 b(memory)g(use)g(to)h -(around)e(the)i(same)f(\014gure,)h(at)g(the)g(exp)s(ense)f(of)g(y)m -(our)870 3324 y(compression)g(ratio.)50 b(In)33 b(short,)i(if)d(y)m -(our)i(mac)m(hine)f(is)g(lo)m(w)g(on)h(memory)f(\(8)870 -3428 y(megab)m(ytes)42 b(or)e(less\),)j(use)d(-s)g(for)g(ev)m -(erything.)71 b(See)40 b(MEMOR)-8 b(Y)41 b(MAN-)870 3532 -y(A)m(GEMENT)31 b(b)s(elo)m(w.)390 3686 y Fj(-q)f(--quiet)870 -3790 y Fl(Suppress)j(non-essen)m(tial)j(w)m(arning)e(messages.)58 -b(Messages)38 b(p)s(ertaining)33 b(to)870 3893 y(I/O)d(errors)g(and)g -(other)h(critical)e(ev)m(en)m(ts)j(will)27 b(not)k(b)s(e)f(suppressed.) -390 4047 y Fj(-v)g(--verbose)870 4151 y Fl(V)-8 b(erb)s(ose)28 -b(mo)s(de)f({)i(sho)m(w)e(the)h(compression)f(ratio)h(for)f(eac)m(h)i -(\014le)e(pro)s(cessed.)870 4255 y(F)-8 b(urther)30 b -Fj(-v)p Fl('s)g(increase)g(the)g(v)m(erb)s(osit)m(y)g(lev)m(el,)h(sp)s -(ewing)d(out)j(lots)f(of)g(infor-)870 4359 y(mation)g(whic)m(h)f(is)h -(primarily)d(of)j(in)m(terest)h(for)f(diagnostic)g(purp)s(oses.)390 -4513 y Fj(-L)g(--license)e(-V)h(--version)870 4617 y -Fl(Displa)m(y)h(the)g(soft)m(w)m(are)i(v)m(ersion,)e(license)f(terms)i -(and)e(conditions.)390 4771 y Fj(-1)h(to)g(-9)72 b Fl(Set)35 -b(the)g(blo)s(c)m(k)f(size)h(to)g(100)h(k,)g(200)g(k)f(..)53 -b(900)36 b(k)f(when)f(compressing.)53 b(Has)870 4875 -y(no)41 b(e\013ect)h(when)d(decompressing.)71 b(See)41 -b(MEMOR)-8 b(Y)41 b(MANA)m(GEMENT)870 4978 y(b)s(elo)m(w.)390 -5132 y Fj(--)324 b Fl(T)-8 b(reats)25 b(all)e(subsequen)m(t)g(argumen)m -(ts)i(as)f(\014le)g(names,)h(ev)m(en)g(if)e(they)i(start)f(with)870 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b(\014les)f(compressed)g(with)g(the)g(default)g -(900k)i(blo)s(c)m(k)e(size,)49 b Fj(bunzip2)42 b Fl(will)g(require)390 -3538 y(ab)s(out)29 b(3700)j(kb)m(ytes)e(to)h(decompress.)40 -b(T)-8 b(o)30 b(supp)s(ort)e(decompression)h(of)h(an)m(y)g(\014le)f(on) -g(a)i(4)390 3642 y(megab)m(yte)h(mac)m(hine,)d Fj(bunzip2)f -Fl(has)i(an)g(option)f(to)i(decompress)e(using)g(appro)m(ximately)390 -3745 y(half)k(this)g(amoun)m(t)i(of)f(memory)-8 b(,)36 -b(ab)s(out)e(2300)i(kb)m(ytes.)53 b(Decompression)34 -b(sp)s(eed)g(is)f(also)390 3849 y(halv)m(ed,)i(so)f(y)m(ou)h(should)d -(use)h(this)g(option)h(only)f(where)h(necessary)-8 b(.)53 -b(The)33 b(relev)-5 b(an)m(t)35 b(\015ag)390 3953 y(is)29 -b Fj(-s)p Fl(.)390 4104 y(In)34 b(general,)i(try)f(and)f(use)g(the)h -(largest)h(blo)s(c)m(k)e(size)h(memory)f(constrain)m(ts)h(allo)m(w,)h -(since)390 4208 y(that)45 b(maximises)f(the)h(compression)f(ac)m(hiev)m -(ed.)85 b(Compression)43 b(and)h(decompression)390 4311 -y(sp)s(eed)30 b(are)g(virtually)e(una\013ected)j(b)m(y)f(blo)s(c)m(k)g -(size.)390 4463 y(Another)25 b(signi\014can)m(t)f(p)s(oin)m(t)g -(applies)f(to)j(\014les)e(whic)m(h)g(\014t)h(in)e(a)j(single)d(blo)s(c) -m(k)i({)g(that)h(means)390 4566 y(most)g(\014les)g(y)m(ou'd)g(encoun)m -(ter)h(using)d(a)j(large)f(blo)s(c)m(k)g(size.)39 b(The)25 -b(amoun)m(t)i(of)f(real)g(memory)390 4670 y(touc)m(hed)38 -b(is)e(prop)s(ortional)f(to)j(the)f(size)g(of)h(the)f(\014le,)h(since)f -(the)g(\014le)g(is)f(smaller)g(than)h(a)390 4774 y(blo)s(c)m(k.)49 -b(F)-8 b(or)35 b(example,)f(compressing)e(a)i(\014le)e(20,000)k(b)m -(ytes)e(long)f(with)f(the)i(\015ag)g Fj(-9)f Fl(will)390 -4878 y(cause)28 b(the)f(compressor)g(to)h(allo)s(cate)f(around)f(7600k) -j(of)e(memory)-8 b(,)28 b(but)f(only)f(touc)m(h)i(400k)390 -4981 y Fj(+)h Fl(20000)j(*)e(8)g(=)f(560)i(kb)m(ytes)f(of)g(it.)40 -b(Similarly)-8 b(,)26 b(the)k(decompressor)f(will)e(allo)s(cate)j -(3700k)390 5085 y(but)g(only)f(touc)m(h)i(100k)h Fj(+)e 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-g(but)f(tak)m(es)j(most)f(memory)-8 b(.)150 2993 y(P)m(arameter)29 -b Fj(verbosity)c Fl(should)h(b)s(e)h(set)i(to)f(a)h(n)m(um)m(b)s(er)d -(b)s(et)m(w)m(een)j(0)f(and)f(4)h(inclusiv)m(e.)38 b(0)28 -b(is)f(silen)m(t,)h(and)150 3103 y(greater)j(n)m(um)m(b)s(ers)c(giv)m -(e)j(increasingly)d(v)m(erb)s(ose)j(monitoring/debugging)d(output.)40 -b(If)29 b(the)g(library)e(has)150 3212 y(b)s(een)j(compiled)e(with)i -Fj(-DBZ_NO_STDIO)p Fl(,)d(no)j(suc)m(h)g(output)g(will)e(app)s(ear)h -(for)h(an)m(y)h(v)m(erb)s(osit)m(y)f(setting.)150 3369 -y(P)m(arameter)35 b Fj(workFactor)d Fl(con)m(trols)i(ho)m(w)g(the)g -(compression)f(phase)h(b)s(eha)m(v)m(es)g(when)f(presen)m(ted)h(with) -150 3479 y(w)m(orst)40 b(case,)j(highly)37 b(rep)s(etitiv)m(e,)k(input) -d(data.)68 b(If)39 b(compression)g(runs)e(in)m(to)j(di\016culties)d -(caused)i(b)m(y)150 3588 y(rep)s(etitiv)m(e)34 b(data,)j(the)e(library) -d(switc)m(hes)j(from)f(the)h(standard)f(sorting)g(algorithm)g(to)i(a)f -(fallbac)m(k)f(al-)150 3698 y(gorithm.)47 b(The)32 b(fallbac)m(k)g(is)g -(slo)m(w)m(er)g(than)h(the)f(standard)g(algorithm)g(b)m(y)g(p)s(erhaps) -f(a)i(factor)h(of)e(three,)150 3808 y(but)e(alw)m(a)m(ys)h(b)s(eha)m(v) -m(es)f(reasonably)-8 b(,)31 b(no)f(matter)h(ho)m(w)g(bad)f(the)g -(input.)150 3965 y(Lo)m(w)m(er)25 b(v)-5 b(alues)24 b(of)h -Fj(workFactor)d Fl(reduce)i(the)h(amoun)m(t)g(of)g(e\013ort)g(the)g -(standard)f(algorithm)f(will)f(exp)s(end)150 4074 y(b)s(efore)j -(resorting)h(to)g(the)g(fallbac)m(k.)39 b(Y)-8 b(ou)27 -b(should)c(set)k(this)e(parameter)h(carefully;)g(to)s(o)h(lo)m(w,)g -(and)e(man)m(y)150 4184 y(inputs)32 b(will)f(b)s(e)i(handled)f(b)m(y)i -(the)g(fallbac)m(k)g(algorithm)f(and)g(so)h(compress)g(rather)g(slo)m -(wly)-8 b(,)34 b(to)s(o)h(high,)150 4293 y(and)24 b(y)m(our)h(a)m(v)m -(erage-to-w)m(orst)30 b(case)c(compression)e(times)h(can)g(b)s(ecome)g -(v)m(ery)h(large.)39 b(The)24 b(default)g(v)-5 b(alue)150 -4403 y(of)31 b(30)g(giv)m(es)f(reasonable)h(b)s(eha)m(viour)e(o)m(v)m -(er)i(a)g(wide)e(range)i(of)f(circumstances.)150 4560 -y(Allo)m(w)m(able)h(v)-5 b(alues)31 b(range)i(from)e(0)i(to)f(250)h -(inclusiv)m(e.)44 b(0)32 b(is)f(a)h(sp)s(ecial)f(case,)i(equiv)-5 -b(alen)m(t)32 b(to)g(using)f(the)150 4669 y(default)f(v)-5 -b(alue)29 b(of)i(30.)150 4826 y(Note)38 b(that)f(the)g(compressed)f -(output)g(generated)h(is)f(the)g(same)h(regardless)f(of)h(whether)f(or) -g(not)h(the)150 4936 y(fallbac)m(k)30 b(algorithm)f(is)h(used.)150 -5093 y(Be)23 b(a)m(w)m(are)h(also)f(that)g(this)f(parameter)h(ma)m(y)g -(disapp)s(ear)e(en)m(tirely)h(in)f(future)h(v)m(ersions)g(of)h(the)g -(library)-8 b(.)36 b(In)150 5202 y(principle)20 b(it)j(should)e(b)s(e)h -(p)s(ossible)f(to)j(devise)f(a)g(go)s(o)s(d)g(w)m(a)m(y)i(to)f -(automatically)f(c)m(ho)s(ose)h(whic)m(h)e(algorithm)150 -5312 y(to)31 b(use.)41 b(Suc)m(h)29 b(a)i(mec)m(hanism)f(w)m(ould)f -(render)g(the)i(parameter)g(obsolete.)p eop -%%Page: 14 15 -14 14 bop 150 -116 a Fl(Chapter)30 b(3:)41 b(Programming)29 -b(with)g Fj(libbzip2)1881 b Fl(14)150 299 y(P)m(ossible)29 -b(return)h(v)-5 b(alues:)572 450 y Fj(BZ_CONFIG_ERROR)663 -554 y Fl(if)29 b(the)i(library)d(has)i(b)s(een)f(mis-compiled)572 -657 y Fj(BZ_PARAM_ERROR)663 761 y Fl(if)g Fj(strm)g Fl(is)h -Fj(NULL)663 865 y Fl(or)g Fj(blockSize)e(<)i Fl(1)h(or)f -Fj(blockSize)e(>)i Fl(9)663 969 y(or)g Fj(verbosity)e(<)i -Fl(0)h(or)f Fj(verbosity)e(>)i Fl(4)663 1073 y(or)g Fj(workFactor)e(<)i -Fl(0)g(or)h Fj(workFactor)c(>)j Fl(250)572 1176 y Fj(BZ_MEM_ERROR)663 -1280 y Fl(if)f(not)i(enough)f(memory)g(is)f(a)m(v)-5 -b(ailable)572 1384 y Fj(BZ_OK)663 1488 y Fl(otherwise)150 -1645 y(Allo)m(w)m(able)30 b(next)g(actions:)572 1796 -y Fj(BZ2_bzCompress)663 1899 y Fl(if)f Fj(BZ_OK)g Fl(is)g(returned)572 -2003 y(no)h(sp)s(eci\014c)f(action)i(needed)f(in)f(case)i(of)g(error) -150 2255 y Ff(3.3.2)63 b Fe(BZ2_bzCompress)533 2441 y -Fj(int)47 b(BZ2_bzCompress)d(\()j(bz_stream)f(*strm,)g(int)h(action)f -(\);)150 2598 y Fl(Pro)m(vides)28 b(more)g(input)f(and/or)h(output)g -(bu\013er)g(space)h(for)f(the)h(library)-8 b(.)38 b(The)28 -b(caller)g(main)m(tains)f(input)150 2708 y(and)j(output)g(bu\013ers,)f -(and)h(calls)g Fj(BZ2_bzCompress)c Fl(to)31 b(transfer)f(data)h(b)s(et) -m(w)m(een)g(them.)150 2865 y(Before)j(eac)m(h)g(call)e(to)i -Fj(BZ2_bzCompress)p Fl(,)c Fj(next_in)h Fl(should)g(p)s(oin)m(t)h(at)h -(the)g(data)h(to)g(b)s(e)e(compressed,)150 2974 y(and)41 -b Fj(avail_in)f Fl(should)g(indicate)h(ho)m(w)h(man)m(y)f(b)m(ytes)i -(the)f(library)d(ma)m(y)k(read.)75 b Fj(BZ2_bzCompress)150 -3084 y Fl(up)s(dates)29 b Fj(next_in)p Fl(,)g Fj(avail_in)f -Fl(and)i Fj(total_in)e Fl(to)j(re\015ect)g(the)g(n)m(um)m(b)s(er)e(of)h -(b)m(ytes)h(it)f(has)g(read.)150 3241 y(Similarly)-8 -b(,)27 b Fj(next_out)h Fl(should)g(p)s(oin)m(t)h(to)i(a)f(bu\013er)f -(in)g(whic)m(h)g(the)h(compressed)g(data)h(is)e(to)i(b)s(e)e(placed,) -150 3350 y(with)i Fj(avail_out)f Fl(indicating)h(ho)m(w)h(m)m(uc)m(h)h -(output)f(space)h(is)f(a)m(v)-5 b(ailable.)46 b Fj(BZ2_bzCompress)29 -b Fl(up)s(dates)150 3460 y Fj(next_out)p Fl(,)f Fj(avail_out)g -Fl(and)i Fj(total_out)e Fl(to)j(re\015ect)g(the)f(n)m(um)m(b)s(er)g(of) -g(b)m(ytes)h(output.)150 3617 y(Y)-8 b(ou)40 b(ma)m(y)g(pro)m(vide)e -(and)h(remo)m(v)m(e)i(as)f(little)e(or)h(as)h(m)m(uc)m(h)f(data)h(as)g -(y)m(ou)f(lik)m(e)g(on)g(eac)m(h)i(call)e(of)g Fj(BZ2_)150 -3726 y(bzCompress)p Fl(.)48 b(In)33 b(the)h(limit,)f(it)h(is)f -(acceptable)h(to)h(supply)c(and)j(remo)m(v)m(e)h(data)g(one)f(b)m(yte)g -(at)h(a)f(time,)150 3836 y(although)28 b(this)f(w)m(ould)g(b)s(e)h -(terribly)e(ine\016cien)m(t.)39 b(Y)-8 b(ou)29 b(should)e(alw)m(a)m(ys) -h(ensure)g(that)h(at)g(least)g(one)f(b)m(yte)150 3946 -y(of)j(output)f(space)g(is)g(a)m(v)-5 b(ailable)30 b(at)h(eac)m(h)g -(call.)150 4102 y(A)38 b(second)h(purp)s(ose)d(of)j Fj(BZ2_bzCompress) -34 b Fl(is)j(to)i(request)f(a)h(c)m(hange)g(of)g(mo)s(de)e(of)i(the)f -(compressed)150 4212 y(stream.)150 4369 y(Conceptually)-8 -b(,)24 b(a)g(compressed)g(stream)g(can)f(b)s(e)g(in)g(one)h(of)f(four)g -(states:)39 b(IDLE,)24 b(R)m(UNNING,)h(FLUSH-)150 4478 -y(ING)37 b(and)g(FINISHING.)g(Before)i(initialisation)33 -b(\()p Fj(BZ2_bzCompressInit)p Fl(\))g(and)j(after)i(termination)150 -4588 y(\()p Fj(BZ2_bzCompressEnd)p Fl(\),)27 b(a)j(stream)h(is)f -(regarded)g(as)g(IDLE.)150 4745 y(Up)s(on)35 b(initialisation)e(\()p -Fj(BZ2_bzCompressInit)p Fl(\),)h(the)i(stream)h(is)e(placed)h(in)e(the) -j(R)m(UNNING)g(state.)150 4854 y(Subsequen)m(t)j(calls)g(to)i -Fj(BZ2_bzCompress)37 b Fl(should)j(pass)g Fj(BZ_RUN)g -Fl(as)h(the)g(requested)h(action;)47 b(other)150 4964 -y(actions)31 b(are)f(illegal)f(and)h(will)d(result)j(in)f -Fj(BZ_SEQUENCE_ERROR)p Fl(.)150 5121 y(A)m(t)38 b(some)f(p)s(oin)m(t,)h -(the)f(calling)e(program)i(will)d(ha)m(v)m(e)k(pro)m(vided)e(all)f(the) -i(input)e(data)j(it)e(w)m(an)m(ts)i(to.)61 b(It)150 5230 -y(will)28 b(then)h(w)m(an)m(t)i(to)g(\014nish)d(up)h({)i(in)d -(e\013ect,)k(asking)e(the)g(library)e(to)j(pro)s(cess)f(an)m(y)g(data)h -(it)f(migh)m(t)g(ha)m(v)m(e)150 5340 y(bu\013ered)25 -b(in)m(ternally)-8 b(.)38 b(In)25 b(this)g(state,)k Fj(BZ2_bzCompress) -22 b Fl(will)i(no)i(longer)g(attempt)h(to)g(read)f(data)h(from)p -eop -%%Page: 15 16 -15 15 bop 150 -116 a Fl(Chapter)30 b(3:)41 b(Programming)29 -b(with)g Fj(libbzip2)1881 b Fl(15)150 299 y Fj(next_in)p -Fl(,)33 b(but)g(it)h(will)d(w)m(an)m(t)k(to)g(write)e(data)h(to)h -Fj(next_out)p Fl(.)49 b(Because)36 b(the)e(output)f(bu\013er)g -(supplied)150 408 y(b)m(y)e(the)h(user)e(can)i(b)s(e)f(arbitrarily)d -(small,)j(the)g(\014nishing-up)d(op)s(eration)i(cannot)i(necessarily)e -(b)s(e)h(done)150 518 y(with)e(a)i(single)e(call)h(of)g -Fj(BZ2_bzCompress)p Fl(.)150 675 y(Instead,)47 b(the)d(calling)f -(program)g(passes)h Fj(BZ_FINISH)d Fl(as)j(an)g(action)g(to)h -Fj(BZ2_bzCompress)p Fl(.)77 b(This)150 784 y(c)m(hanges)30 -b(the)f(stream's)g(state)h(to)f(FINISHING.)g(An)m(y)g(remaining)e -(input)g(\(ie,)i Fj(next_in[0)f(..)i(avail_)150 894 y(in-1])p -Fl(\))36 b(is)f(compressed)i(and)f(transferred)g(to)h(the)g(output)g -(bu\013er.)58 b(T)-8 b(o)38 b(do)e(this,)i Fj(BZ2_bzCompress)150 -1004 y Fl(m)m(ust)h(b)s(e)f(called)g(rep)s(eatedly)h(un)m(til)e(all)h -(the)h(output)f(has)h(b)s(een)f(consumed.)66 b(A)m(t)40 -b(that)g(p)s(oin)m(t,)g Fj(BZ2_)150 1113 y(bzCompress)h -Fl(returns)h Fj(BZ_STREAM_END)p Fl(,)i(and)f(the)h(stream's)g(state)h -(is)d(set)j(bac)m(k)f(to)g(IDLE.)g Fj(BZ2_)150 1223 y(bzCompressEnd)27 -b Fl(should)h(then)i(b)s(e)g(called.)150 1380 y(Just)25 -b(to)i(mak)m(e)g(sure)e(the)i(calling)d(program)i(do)s(es)g(not)g(c)m -(heat,)i(the)f(library)c(mak)m(es)k(a)f(note)h(of)f Fj(avail_in)150 -1489 y Fl(at)g(the)g(time)f(of)g(the)g(\014rst)g(call)g(to)h -Fj(BZ2_bzCompress)21 b Fl(whic)m(h)j(has)h Fj(BZ_FINISH)e -Fl(as)i(an)h(action)f(\(ie,)i(at)f(the)150 1599 y(time)d(the)h(program) -g(has)f(announced)g(its)h(in)m(ten)m(tion)f(to)h(not)g(supply)e(an)m(y) -i(more)g(input\).)37 b(By)24 b(comparing)150 1708 y(this)k(v)-5 -b(alue)28 b(with)g(that)h(of)h Fj(avail_in)c Fl(o)m(v)m(er)k(subsequen) -m(t)f(calls)f(to)h Fj(BZ2_bzCompress)p Fl(,)d(the)j(library)e(can)150 -1818 y(detect)33 b(an)m(y)e(attempts)i(to)f(slip)d(in)h(more)h(data)h -(to)h(compress.)43 b(An)m(y)31 b(calls)g(for)g(whic)m(h)f(this)g(is)h -(detected)150 1928 y(will)j(return)h Fj(BZ_SEQUENCE_ERROR)p -Fl(.)55 b(This)34 b(indicates)i(a)h(programming)e(mistak)m(e)i(whic)m -(h)e(should)g(b)s(e)150 2037 y(corrected.)150 2194 y(Instead)i(of)g -(asking)f(to)h(\014nish,)f(the)h(calling)f(program)g(ma)m(y)h(ask)g -Fj(BZ2_bzCompress)c Fl(to)38 b(tak)m(e)g(all)e(the)150 -2304 y(remaining)j(input,)i(compress)f(it)g(and)g(terminate)h(the)g -(curren)m(t)f(\(Burro)m(ws-Wheeler\))h(compression)150 -2413 y(blo)s(c)m(k.)e(This)26 b(could)h(b)s(e)g(useful)f(for)h(error)h -(con)m(trol)g(purp)s(oses.)38 b(The)27 b(mec)m(hanism)g(is)g(analogous) -h(to)g(that)150 2523 y(for)35 b(\014nishing:)46 b(call)35 -b Fj(BZ2_bzCompress)c Fl(with)i(an)i(action)g(of)g Fj(BZ_FLUSH)p -Fl(,)g(remo)m(v)m(e)h(output)f(data,)i(and)150 2632 y(p)s(ersist)h -(with)g(the)i Fj(BZ_FLUSH)e Fl(action)i(un)m(til)e(the)i(v)-5 -b(alue)39 b Fj(BZ_RUN)f Fl(is)h(returned.)68 b(As)39 -b(with)g(\014nishing,)150 2742 y Fj(BZ2_bzCompress)23 -b Fl(detects)28 b(an)m(y)f(attempt)h(to)f(pro)m(vide)f(more)h(input)e -(data)i(once)g(the)g(\015ush)e(has)i(b)s(egun.)150 2899 -y(Once)j(the)h(\015ush)e(is)g(complete,)i(the)g(stream)f(returns)g(to)h -(the)f(normal)g(R)m(UNNING)h(state.)150 3056 y(This)f(all)h(sounds)g -(prett)m(y)h(complex,)h(but)e(isn't)g(really)-8 b(.)45 -b(Here's)33 b(a)f(table)g(whic)m(h)f(sho)m(ws)h(whic)m(h)f(actions)150 -3165 y(are)e(allo)m(w)m(able)f(in)f(eac)m(h)j(state,)g(what)f(action)g -(will)c(b)s(e)j(tak)m(en,)j(what)d(the)h(next)f(state)i(is,)e(and)g -(what)h(the)150 3275 y(non-error)h(return)f(v)-5 b(alues)29 -b(are.)41 b(Note)32 b(that)e(y)m(ou)h(can't)g(explicitly)d(ask)i(what)g -(state)i(the)e(stream)h(is)e(in,)150 3384 y(but)h(nor)g(do)g(y)m(ou)h -(need)f(to)h({)g(it)e(can)i(b)s(e)f(inferred)e(from)i(the)h(v)-5 -b(alues)29 b(returned)h(b)m(y)g Fj(BZ2_bzCompress)p Fl(.)390 -3535 y(IDLE/)p Fj(any)572 3639 y Fl(Illegal.)60 b(IDLE)30 -b(state)i(only)d(exists)h(after)h Fj(BZ2_bzCompressEnd)26 -b Fl(or)572 3743 y(b)s(efore)k Fj(BZ2_bzCompressInit)p -Fl(.)572 3847 y(Return)f(v)-5 b(alue)30 b(=)g Fj(BZ_SEQUENCE_ERROR)390 -4054 y Fl(R)m(UNNING/)p Fj(BZ_RUN)572 4158 y Fl(Compress)f(from)h -Fj(next_in)f Fl(to)i Fj(next_out)d Fl(as)i(m)m(uc)m(h)h(as)f(p)s -(ossible.)572 4262 y(Next)h(state)h(=)e(R)m(UNNING)572 -4366 y(Return)f(v)-5 b(alue)30 b(=)g Fj(BZ_RUN_OK)390 -4573 y Fl(R)m(UNNING/)p Fj(BZ_FLUSH)572 4677 y Fl(Remem)m(b)s(er)g -(curren)m(t)g(v)-5 b(alue)30 b(of)g Fj(next_in)p Fl(.)59 -b(Compress)30 b(from)g Fj(next_in)572 4781 y Fl(to)h -Fj(next_out)d Fl(as)j(m)m(uc)m(h)f(as)h(p)s(ossible,)d(but)i(do)g(not)g -(accept)i(an)m(y)f(more)f(input.)572 4885 y(Next)h(state)h(=)e -(FLUSHING)572 4988 y(Return)f(v)-5 b(alue)30 b(=)g Fj(BZ_FLUSH_OK)390 -5196 y Fl(R)m(UNNING/)p Fj(BZ_FINISH)572 5300 y Fl(Remem)m(b)s(er)g -(curren)m(t)g(v)-5 b(alue)30 b(of)g Fj(next_in)p Fl(.)59 -b(Compress)30 b(from)g Fj(next_in)p eop -%%Page: 16 17 -16 16 bop 150 -116 a Fl(Chapter)30 b(3:)41 b(Programming)29 -b(with)g Fj(libbzip2)1881 b Fl(16)572 299 y(to)31 b Fj(next_out)d -Fl(as)j(m)m(uc)m(h)f(as)h(p)s(ossible,)d(but)i(do)g(not)g(accept)i(an)m -(y)f(more)f(input.)572 403 y(Next)h(state)h(=)e(FINISHING)572 -506 y(Return)f(v)-5 b(alue)30 b(=)g Fj(BZ_FINISH_OK)390 -714 y Fl(FLUSHING/)p Fj(BZ_FLUSH)572 818 y Fl(Compress)f(from)h -Fj(next_in)f Fl(to)i Fj(next_out)d Fl(as)i(m)m(uc)m(h)h(as)f(p)s -(ossible,)572 922 y(but)f(do)i(not)f(accept)i(an)m(y)f(more)f(input.) -572 1025 y(If)g(all)f(the)i(existing)e(input)f(has)i(b)s(een)g(used)g -(up)f(and)h(all)f(compressed)572 1129 y(output)h(has)g(b)s(een)g(remo)m -(v)m(ed)663 1233 y(Next)h(state)h(=)e(R)m(UNNING;)i(Return)d(v)-5 -b(alue)30 b(=)g Fj(BZ_RUN_OK)572 1337 y Fl(else)663 1440 -y(Next)h(state)h(=)e(FLUSHING;)h(Return)e(v)-5 b(alue)30 -b(=)g Fj(BZ_FLUSH_OK)390 1648 y Fl(FLUSHING/other)572 -1752 y(Illegal.)572 1856 y(Return)f(v)-5 b(alue)30 b(=)g -Fj(BZ_SEQUENCE_ERROR)390 2063 y Fl(FINISHING/)p Fj(BZ_FINISH)572 -2167 y Fl(Compress)f(from)h Fj(next_in)f Fl(to)i Fj(next_out)d -Fl(as)i(m)m(uc)m(h)h(as)f(p)s(ossible,)572 2271 y(but)f(to)j(not)e -(accept)i(an)m(y)f(more)f(input.)572 2374 y(If)g(all)f(the)i(existing)e -(input)f(has)i(b)s(een)g(used)g(up)f(and)h(all)f(compressed)572 -2478 y(output)h(has)g(b)s(een)g(remo)m(v)m(ed)663 2582 -y(Next)h(state)h(=)e(IDLE;)g(Return)g(v)-5 b(alue)30 -b(=)g Fj(BZ_STREAM_END)572 2686 y Fl(else)663 2790 y(Next)h(state)h(=)e -(FINISHING;)g(Return)g(v)-5 b(alue)30 b(=)g Fj(BZ_FINISHING)390 -2997 y Fl(FINISHING/other)572 3101 y(Illegal.)572 3205 -y(Return)f(v)-5 b(alue)30 b(=)g Fj(BZ_SEQUENCE_ERROR)150 -3361 y Fl(That)24 b(still)f(lo)s(oks)g(complicated?)39 -b(W)-8 b(ell,)25 b(fair)f(enough.)38 b(The)24 b(usual)f(sequence)i(of)f -(calls)g(for)g(compressing)150 3471 y(a)31 b(load)f(of)g(data)h(is:)225 -3628 y Fi(\017)60 b Fl(Get)31 b(started)g(with)e Fj(BZ2_bzCompressInit) -p Fl(.)225 3774 y Fi(\017)60 b Fl(Sho)m(v)m(el)38 b(data)h(in)e(and)g -(shlurp)e(out)k(its)e(compressed)h(form)g(using)e(zero)j(or)f(more)h -(calls)e(of)h Fj(BZ2_)330 3884 y(bzCompress)28 b Fl(with)h(action)h(=)g -Fj(BZ_RUN)p Fl(.)225 4030 y Fi(\017)60 b Fl(Finish)23 -b(up.)38 b(Rep)s(eatedly)25 b(call)f Fj(BZ2_bzCompress)e -Fl(with)i(action)h(=)g Fj(BZ_FINISH)p Fl(,)f(cop)m(ying)h(out)h(the)330 -4139 y(compressed)k(output,)g(un)m(til)f Fj(BZ_STREAM_END)e -Fl(is)i(returned.)225 4285 y Fi(\017)60 b Fl(Close)30 -b(up)f(and)h(go)h(home.)41 b(Call)29 b Fj(BZ2_bzCompressEnd)p -Fl(.)150 4478 y(If)23 b(the)h(data)h(y)m(ou)f(w)m(an)m(t)h(to)f -(compress)g(\014ts)f(in)m(to)h(y)m(our)g(input)e(bu\013er)h(all)f(at)j -(once,)h(y)m(ou)e(can)g(skip)f(the)h(calls)150 4588 y(of)37 -b Fj(BZ2_bzCompress)26 b(\()k(...,)f(BZ_RUN)g(\))36 b -Fl(and)g(just)g(do)h(the)g Fj(BZ2_bzCompress)26 b(\()k(...,)f -(BZ_FINISH)150 4698 y(\))h Fl(calls.)150 4854 y(All)36 -b(required)g(memory)h(is)f(allo)s(cated)i(b)m(y)f Fj -(BZ2_bzCompressInit)p Fl(.)56 b(The)37 b(compression)g(library)e(can) -150 4964 y(accept)g(an)m(y)f(data)h(at)g(all)d(\(ob)m(viously\).)51 -b(So)34 b(y)m(ou)g(shouldn't)e(get)j(an)m(y)f(error)f(return)g(v)-5 -b(alues)33 b(from)h(the)150 5074 y Fj(BZ2_bzCompress)29 -b Fl(calls.)46 b(If)32 b(y)m(ou)h(do,)g(they)g(will)d(b)s(e)i -Fj(BZ_SEQUENCE_ERROR)p Fl(,)d(and)j(indicate)f(a)i(bug)f(in)150 -5183 y(y)m(our)e(programming.)150 5340 y(T)-8 b(rivial)28 -b(other)j(p)s(ossible)d(return)h(v)-5 b(alues:)p eop -%%Page: 17 18 -17 17 bop 150 -116 a Fl(Chapter)30 b(3:)41 b(Programming)29 -b(with)g Fj(libbzip2)1881 b Fl(17)572 299 y Fj(BZ_PARAM_ERROR)663 -403 y Fl(if)29 b Fj(strm)g Fl(is)h Fj(NULL)p Fl(,)f(or)i -Fj(strm->s)d Fl(is)h Fj(NULL)150 652 y Ff(3.3.3)63 b -Fe(BZ2_bzCompressEnd)390 839 y Fj(int)47 b(BZ2_bzCompressEnd)c(\()k -(bz_stream)f(*strm)g(\);)150 996 y Fl(Releases)31 b(all)e(memory)h -(asso)s(ciated)h(with)e(a)i(compression)e(stream.)150 -1153 y(P)m(ossible)g(return)h(v)-5 b(alues:)481 1304 -y Fj(BZ_PARAM_ERROR)117 b Fl(if)30 b Fj(strm)f Fl(is)g -Fj(NULL)g Fl(or)i Fj(strm->s)d Fl(is)i Fj(NULL)481 1408 -y(BZ_OK)120 b Fl(otherwise)150 1657 y Ff(3.3.4)63 b Fe -(BZ2_bzDecompressInit)390 1844 y Fj(int)47 b(BZ2_bzDecompressInit)42 -b(\()48 b(bz_stream)d(*strm,)h(int)h(verbosity,)e(int)i(small)f(\);)150 -2001 y Fl(Prepares)30 b(for)f(decompression.)40 b(As)29 -b(with)g Fj(BZ2_bzCompressInit)p Fl(,)c(a)31 b Fj(bz_stream)c -Fl(record)j(should)e(b)s(e)150 2110 y(allo)s(cated)c(and)f(initialised) -e(b)s(efore)i(the)i(call.)38 b(Fields)22 b Fj(bzalloc)p -Fl(,)i Fj(bzfree)e Fl(and)i Fj(opaque)e Fl(should)g(b)s(e)h(set)i(if) -150 2220 y(a)h(custom)f(memory)g(allo)s(cator)g(is)g(required,)f(or)h -(made)h Fj(NULL)e Fl(for)h(the)g(normal)f Fj(malloc)p -Fl(/)p Fj(free)f Fl(routines.)150 2330 y(Up)s(on)h(return,)h(the)g(in)m -(ternal)f(state)i(will)c(ha)m(v)m(e)k(b)s(een)f(initialised,)d(and)i -Fj(total_in)f Fl(and)h Fj(total_out)f Fl(will)150 2439 -y(b)s(e)30 b(zero.)150 2596 y(F)-8 b(or)31 b(the)g(meaning)e(of)i -(parameter)g Fj(verbosity)p Fl(,)d(see)j Fj(BZ2_bzCompressInit)p -Fl(.)150 2753 y(If)e Fj(small)e Fl(is)h(nonzero,)i(the)f(library)e -(will)f(use)j(an)g(alternativ)m(e)h(decompression)e(algorithm)g(whic)m -(h)f(uses)150 2862 y(less)c(memory)g(but)g(at)h(the)g(cost)h(of)e -(decompressing)g(more)g(slo)m(wly)g(\(roughly)f(sp)s(eaking,)i(half)f -(the)h(sp)s(eed,)150 2972 y(but)34 b(the)i(maxim)m(um)d(memory)i -(requiremen)m(t)g(drops)e(to)j(around)e(2300k\).)57 b(See)35 -b(Chapter)g(2)g(for)g(more)150 3082 y(information)29 -b(on)h(memory)g(managemen)m(t.)150 3238 y(Note)40 b(that)f(the)f(amoun) -m(t)h(of)g(memory)f(needed)g(to)i(decompress)e(a)h(stream)f(cannot)h(b) -s(e)f(determined)150 3348 y(un)m(til)j(the)h(stream's)h(header)f(has)g -(b)s(een)g(read,)j(so)e(ev)m(en)g(if)e Fj(BZ2_bzDecompressInit)c -Fl(succeeds,)46 b(a)150 3458 y(subsequen)m(t)30 b Fj(BZ2_bzDecompress)c -Fl(could)j(fail)g(with)g Fj(BZ_MEM_ERROR)p Fl(.)150 3614 -y(P)m(ossible)g(return)h(v)-5 b(alues:)572 3765 y Fj(BZ_CONFIG_ERROR) -663 3869 y Fl(if)29 b(the)i(library)d(has)i(b)s(een)f(mis-compiled)572 -3973 y Fj(BZ_PARAM_ERROR)663 4077 y Fl(if)g Fj(\(small)46 -b(!=)h(0)h(&&)f(small)f(!=)h(1\))663 4181 y Fl(or)30 -b Fj(\(verbosity)45 b(<)j(0)f(||)g(verbosity)e(>)j(4\))572 -4284 y(BZ_MEM_ERROR)663 4388 y Fl(if)29 b(insu\016cien)m(t)g(memory)h -(is)f(a)m(v)-5 b(ailable)150 4545 y(Allo)m(w)m(able)30 -b(next)g(actions:)572 4696 y Fj(BZ2_bzDecompress)663 -4800 y Fl(if)f Fj(BZ_OK)g Fl(w)m(as)i(returned)572 4904 -y(no)f(sp)s(eci\014c)f(action)i(required)e(in)g(case)i(of)g(error)150 -5153 y Ff(3.3.5)63 b Fe(BZ2_bzDecompress)390 5340 y Fj(int)47 -b(BZ2_bzDecompress)c(\()48 b(bz_stream)d(*strm)h(\);)p -eop -%%Page: 18 19 -18 18 bop 150 -116 a Fl(Chapter)30 b(3:)41 b(Programming)29 -b(with)g Fj(libbzip2)1881 b Fl(18)150 299 y(Pro)m(vides)24 -b(more)g(input)f(and/out)h(output)g(bu\013er)g(space)h(for)f(the)g -(library)-8 b(.)37 b(The)24 b(caller)g(main)m(tains)f(input)150 -408 y(and)30 b(output)g(bu\013ers,)f(and)h(uses)g Fj(BZ2_bzDecompress)c -Fl(to)31 b(transfer)f(data)h(b)s(et)m(w)m(een)g(them.)150 -565 y(Before)g(eac)m(h)g(call)f(to)g Fj(BZ2_bzDecompress)p -Fl(,)c Fj(next_in)i Fl(should)h(p)s(oin)m(t)g(at)h(the)h(compressed)e -(data,)j(and)150 675 y Fj(avail_in)h Fl(should)h(indicate)h(ho)m(w)h -(man)m(y)f(b)m(ytes)i(the)e(library)f(ma)m(y)i(read.)56 -b Fj(BZ2_bzDecompress)32 b Fl(up-)150 784 y(dates)f Fj(next_in)p -Fl(,)e Fj(avail_in)f Fl(and)h Fj(total_in)g Fl(to)i(re\015ect)g(the)f -(n)m(um)m(b)s(er)f(of)i(b)m(ytes)g(it)f(has)g(read.)150 -941 y(Similarly)-8 b(,)37 b Fj(next_out)f Fl(should)g(p)s(oin)m(t)i(to) -g(a)h(bu\013er)e(in)g(whic)m(h)g(the)i(uncompressed)e(output)g(is)h(to) -h(b)s(e)150 1051 y(placed,)d(with)e Fj(avail_out)f Fl(indicating)g(ho)m -(w)i(m)m(uc)m(h)g(output)g(space)h(is)e(a)m(v)-5 b(ailable.)55 -b Fj(BZ2_bzCompress)150 1160 y Fl(up)s(dates)29 b Fj(next_out)p -Fl(,)g Fj(avail_out)f Fl(and)h Fj(total_out)f Fl(to)j(re\015ect)g(the)g -(n)m(um)m(b)s(er)e(of)h(b)m(ytes)h(output.)150 1317 y(Y)-8 -b(ou)40 b(ma)m(y)g(pro)m(vide)e(and)h(remo)m(v)m(e)i(as)f(little)e(or)h -(as)h(m)m(uc)m(h)f(data)h(as)g(y)m(ou)f(lik)m(e)g(on)g(eac)m(h)i(call)e -(of)g Fj(BZ2_)150 1427 y(bzDecompress)p Fl(.)e(In)27 -b(the)i(limit,)d(it)i(is)f(acceptable)j(to)f(supply)d(and)h(remo)m(v)m -(e)j(data)f(one)f(b)m(yte)h(at)g(a)g(time,)150 1537 y(although)f(this)f -(w)m(ould)g(b)s(e)h(terribly)e(ine\016cien)m(t.)39 b(Y)-8 -b(ou)29 b(should)e(alw)m(a)m(ys)h(ensure)g(that)h(at)g(least)g(one)f(b) -m(yte)150 1646 y(of)j(output)f(space)g(is)g(a)m(v)-5 -b(ailable)30 b(at)h(eac)m(h)g(call.)150 1803 y(Use)g(of)f -Fj(BZ2_bzDecompress)c Fl(is)k(simpler)e(than)i Fj(BZ2_bzCompress)p -Fl(.)150 1960 y(Y)-8 b(ou)31 b(should)d(pro)m(vide)h(input)f(and)i -(remo)m(v)m(e)i(output)d(as)i(describ)s(ed)d(ab)s(o)m(v)m(e,)k(and)d -(rep)s(eatedly)h(call)f Fj(BZ2_)150 2069 y(bzDecompress)35 -b Fl(un)m(til)i Fj(BZ_STREAM_END)e Fl(is)j(returned.)64 -b(App)s(earance)39 b(of)g Fj(BZ_STREAM_END)c Fl(denotes)150 -2179 y(that)47 b Fj(BZ2_bzDecompress)42 b Fl(has)k(detected)h(the)f -(logical)g(end)g(of)g(the)h(compressed)e(stream.)89 b -Fj(BZ2_)150 2289 y(bzDecompress)28 b Fl(will)g(not)j(pro)s(duce)f -Fj(BZ_STREAM_END)d Fl(un)m(til)j(all)f(output)i(data)h(has)e(b)s(een)h -(placed)f(in)m(to)150 2398 y(the)36 b(output)g(bu\013er,)h(so)g(once)g -Fj(BZ_STREAM_END)32 b Fl(app)s(ears,)38 b(y)m(ou)e(are)h(guaran)m(teed) -g(to)g(ha)m(v)m(e)h(a)m(v)-5 b(ailable)150 2508 y(all)29 -b(the)i(decompressed)f(output,)g(and)g Fj(BZ2_bzDecompressEnd)25 -b Fl(can)31 b(safely)f(b)s(e)f(called.)150 2665 y(If)40 -b(case)h(of)f(an)h(error)e(return)h(v)-5 b(alue,)42 b(y)m(ou)f(should)d -(call)h Fj(BZ2_bzDecompressEnd)c Fl(to)41 b(clean)f(up)g(and)150 -2774 y(release)31 b(memory)-8 b(.)150 2931 y(P)m(ossible)29 -b(return)h(v)-5 b(alues:)572 3082 y Fj(BZ_PARAM_ERROR)663 -3186 y Fl(if)29 b Fj(strm)g Fl(is)h Fj(NULL)f Fl(or)h -Fj(strm->s)f Fl(is)g Fj(NULL)663 3290 y Fl(or)h Fj(strm->avail_out)44 -b(<)j(1)572 3393 y(BZ_DATA_ERROR)663 3497 y Fl(if)29 -b(a)i(data)g(in)m(tegrit)m(y)f(error)g(is)g(detected)h(in)e(the)i -(compressed)f(stream)572 3601 y Fj(BZ_DATA_ERROR_MAGIC)663 -3705 y Fl(if)f(the)i(compressed)f(stream)g(do)s(esn't)h(b)s(egin)e -(with)g(the)h(righ)m(t)g(magic)h(b)m(ytes)572 3808 y -Fj(BZ_MEM_ERROR)663 3912 y Fl(if)e(there)i(w)m(asn't)f(enough)h(memory) -f(a)m(v)-5 b(ailable)572 4016 y Fj(BZ_STREAM_END)663 -4120 y Fl(if)29 b(the)i(logical)e(end)h(of)h(the)f(data)h(stream)g(w)m -(as)g(detected)g(and)f(all)663 4224 y(output)g(in)f(has)h(b)s(een)g -(consumed,)f(eg)j Fj(s->avail_out)44 b(>)k(0)572 4327 -y(BZ_OK)663 4431 y Fl(otherwise)150 4588 y(Allo)m(w)m(able)30 -b(next)g(actions:)572 4739 y Fj(BZ2_bzDecompress)663 -4843 y Fl(if)f Fj(BZ_OK)g Fl(w)m(as)i(returned)572 4946 -y Fj(BZ2_bzDecompressEnd)663 5050 y Fl(otherwise)p eop -%%Page: 19 20 -19 19 bop 150 -116 a Fl(Chapter)30 b(3:)41 b(Programming)29 -b(with)g Fj(libbzip2)1881 b Fl(19)150 299 y Ff(3.3.6)63 -b Fe(BZ2_bzDecompressEnd)390 486 y Fj(int)47 b(BZ2_bzDecompressEnd)42 -b(\()48 b(bz_stream)d(*strm)i(\);)150 643 y Fl(Releases)31 -b(all)e(memory)h(asso)s(ciated)h(with)e(a)i(decompression)e(stream.)150 -799 y(P)m(ossible)g(return)h(v)-5 b(alues:)572 950 y -Fj(BZ_PARAM_ERROR)663 1054 y Fl(if)29 b Fj(strm)g Fl(is)h -Fj(NULL)f Fl(or)h Fj(strm->s)f Fl(is)g Fj(NULL)572 1158 -y(BZ_OK)663 1262 y Fl(otherwise)150 1419 y(Allo)m(w)m(able)h(next)g -(actions:)572 1570 y(None.)150 1857 y Fk(3.4)68 b(High-lev)l(el)47 -b(in)l(terface)150 2050 y Fl(This)35 b(in)m(terface)j(pro)m(vides)d -(functions)h(for)g(reading)g(and)h(writing)e Fj(bzip2)g -Fl(format)i(\014les.)59 b(First,)39 b(some)150 2159 y(general)30 -b(p)s(oin)m(ts.)225 2316 y Fi(\017)60 b Fl(All)35 b(of)h(the)g -(functions)e(tak)m(e)k(an)e Fj(int*)f Fl(\014rst)g(argumen)m(t,)j -Fj(bzerror)p Fl(.)56 b(After)36 b(eac)m(h)h(call,)g Fj(bzerror)330 -2426 y Fl(should)23 b(b)s(e)i(consulted)g(\014rst)g(to)h(determine)e -(the)i(outcome)h(of)e(the)h(call.)38 b(If)25 b Fj(bzerror)f -Fl(is)g Fj(BZ_OK)p Fl(,)i(the)330 2535 y(call)35 b(completed)g -(successfully)-8 b(,)36 b(and)f(only)g(then)g(should)f(the)h(return)g -(v)-5 b(alue)35 b(of)h(the)f(function)g(\(if)330 2645 -y(an)m(y\))30 b(b)s(e)f(consulted.)39 b(If)29 b Fj(bzerror)e -Fl(is)h Fj(BZ_IO_ERROR)p Fl(,)f(there)i(w)m(as)h(an)f(error)g -(reading/writing)e(the)330 2754 y(underlying)32 b(compressed)j(\014le,) -h(and)f(y)m(ou)h(should)d(then)i(consult)g Fj(errno)p -Fl(/)p Fj(perror)e Fl(to)j(determine)330 2864 y(the)i(cause)g(of)g(the) -g(di\016cult)m(y)-8 b(.)61 b Fj(bzerror)36 b Fl(ma)m(y)i(also)g(b)s(e)f -(set)h(to)g(v)-5 b(arious)37 b(other)h(v)-5 b(alues;)41 -b(precise)330 2974 y(details)29 b(are)i(giv)m(en)g(on)f(a)h(p)s -(er-function)d(basis)h(b)s(elo)m(w.)225 3111 y Fi(\017)60 -b Fl(If)40 b Fj(bzerror)f Fl(indicates)g(an)i(error)f(\(ie,)j(an)m -(ything)d(except)h Fj(BZ_OK)f Fl(and)g Fj(BZ_STREAM_END)p -Fl(\),)g(y)m(ou)330 3220 y(should)56 b(immediately)h(call)g -Fj(BZ2_bzReadClose)e Fl(\(or)j Fj(BZ2_bzWriteClose)p -Fl(,)j(dep)s(ending)56 b(on)330 3330 y(whether)50 b(y)m(ou)g(are)h -(attempting)g(to)g(read)f(or)g(to)i(write\))d(to)j(free)e(up)f(all)h -(resources)g(asso)s(ci-)330 3439 y(ated)33 b(with)e(the)i(stream.)47 -b(Once)32 b(an)h(error)f(has)g(b)s(een)g(indicated,)f(b)s(eha)m(viour)g -(of)i(all)e(calls)h(except)330 3549 y Fj(BZ2_bzReadClose)46 -b Fl(\()p Fj(BZ2_bzWriteClose)p Fl(\))h(is)j(unde\014ned.)99 -b(The)50 b(implication)e(is)i(that)h(\(1\))330 3659 y -Fj(bzerror)44 b Fl(should)g(b)s(e)h(c)m(hec)m(k)m(ed)j(after)e(eac)m(h) -h(call,)i(and)c(\(2\))i(if)e Fj(bzerror)f Fl(indicates)g(an)i(error,) -330 3768 y Fj(BZ2_bzReadClose)26 b Fl(\()p Fj(BZ2_bzWriteClose)p -Fl(\))h(should)h(then)i(b)s(e)g(called)g(to)h(clean)f(up.)225 -3905 y Fi(\017)60 b Fl(The)33 b Fj(FILE*)f Fl(argumen)m(ts)h(passed)g -(to)h Fj(BZ2_bzReadOpen)p Fl(/)p Fj(BZ2_bzWriteOp)o(en)27 -b Fl(should)32 b(b)s(e)g(set)i(to)330 4015 y(binary)23 -b(mo)s(de.)38 b(Most)26 b(Unix)d(systems)i(will)d(do)i(this)g(b)m(y)g -(default,)i(but)e(other)g(platforms,)h(including)330 -4124 y(Windo)m(ws)20 b(and)g(Mac,)k(will)19 b(not.)38 -b(If)20 b(y)m(ou)h(omit)g(this,)h(y)m(ou)f(ma)m(y)h(encoun)m(ter)f -(problems)e(when)h(mo)m(ving)330 4234 y(co)s(de)31 b(to)g(new)f -(platforms.)225 4371 y Fi(\017)60 b Fl(Memory)23 b(allo)s(cation)f -(requests)h(are)g(handled)e(b)m(y)i Fj(malloc)p Fl(/)p -Fj(free)p Fl(.)36 b(A)m(t)23 b(presen)m(t)g(there)g(is)f(no)h(facilit)m -(y)330 4481 y(for)40 b(user-de\014ned)e(memory)i(allo)s(cators)g(in)f 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-(b)s(elo)m(w,)j Fj(BZ2_bzRead)35 b Fl(will)h(decompress)i(the)g -Fj(nUnused)e Fl(b)m(ytes)j(starting)f(at)150 941 y Fj(unused)p -Fl(,)k(b)s(efore)e(starting)h(to)g(read)g(from)f(the)h(\014le)f -Fj(f)p Fl(.)71 b(A)m(t)42 b(most)f Fj(BZ_MAX_UNUSED)c -Fl(b)m(ytes)k(ma)m(y)h(b)s(e)150 1051 y(supplied)32 b(lik)m(e)k(this.) -55 b(If)36 b(this)e(facilit)m(y)h(is)g(not)h(required,)g(y)m(ou)g -(should)e(pass)h Fj(NULL)g Fl(and)g Fj(0)g Fl(for)h Fj(unused)150 -1160 y Fl(and)30 b(n)p Fj(Unused)e Fl(resp)s(ectiv)m(ely)-8 -b(.)150 1317 y(F)g(or)31 b(the)g(meaning)e(of)i(parameters)g -Fj(small)e Fl(and)g Fj(verbosity)p Fl(,)f(see)j Fj -(BZ2_bzDecompressInit)p Fl(.)150 1474 y(The)k(amoun)m(t)g(of)g(memory)g -(needed)g(to)g(decompress)g(a)h(\014le)e(cannot)h(b)s(e)g(determined)e -(un)m(til)h(the)h(\014le's)150 1584 y(header)22 b(has)f(b)s(een)g -(read.)38 b(So)22 b(it)f(is)g(p)s(ossible)e(that)k Fj(BZ2_bzReadOpen)17 -b Fl(returns)k Fj(BZ_OK)f Fl(but)h(a)i(subsequen)m(t)150 -1693 y(call)30 b(of)g 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y(Allo)m(w)m(able)g(next)g -(actions:)572 4174 y Fj(BZ2_bzRead)663 4277 y Fl(if)f -Fj(bzerror)f Fl(is)i Fj(BZ_OK)572 4381 y(BZ2_bzClose)663 -4485 y Fl(otherwise)150 4887 y Ff(3.4.2)63 b Fe(BZ2_bzRead)533 -5074 y Fj(int)47 b(BZ2_bzRead)e(\()j(int)e(*bzerror,)g(BZFILE)g(*b,)h -(void)f(*buf,)h(int)g(len)g(\);)150 5230 y Fl(Reads)35 -b(up)f(to)h Fj(len)f Fl(\(uncompressed\))h(b)m(ytes)g(from)f(the)h -(compressed)g(\014le)f Fj(b)g Fl(in)m(to)h(the)g(bu\013er)f -Fj(buf)p Fl(.)53 b(If)150 5340 y(the)30 b(read)f(w)m(as)h(successful,)f -Fj(bzerror)e Fl(is)i(set)h(to)g Fj(BZ_OK)e Fl(and)h(the)h(n)m(um)m(b)s -(er)e(of)i(b)m(ytes)g(read)f(is)g(returned.)p eop -%%Page: 21 22 -21 21 bop 150 -116 a Fl(Chapter)30 b(3:)41 b(Programming)29 -b(with)g Fj(libbzip2)1881 b Fl(21)150 299 y(If)33 b(the)g(logical)g -(end-of-stream)h(w)m(as)g(detected,)i Fj(bzerror)31 b -Fl(will)g(b)s(e)h(set)i(to)g Fj(BZ_STREAM_END)p Fl(,)d(and)i(the)150 -408 y(n)m(um)m(b)s(er)c(of)i(b)m(ytes)f(read)h(is)e(returned.)40 -b(All)29 b(other)h Fj(bzerror)f Fl(v)-5 b(alues)29 b(denote)i(an)g -(error.)150 565 y Fj(BZ2_bzRead)37 b Fl(will)f(supply)h -Fj(len)i Fl(b)m(ytes,)j(unless)c(the)i(logical)f(stream)h(end)e(is)h -(detected)i(or)e(an)g(error)150 675 y(o)s(ccurs.)75 b(Because)43 -b(of)f(this,)i(it)d(is)g(p)s(ossible)e(to)k(detect)g(the)f(stream)g -(end)f(b)m(y)h(observing)f(when)g(the)150 784 y(n)m(um)m(b)s(er)29 -b(of)h(b)m(ytes)g(returned)f(is)g(less)g(than)h(the)g(n)m(um)m(b)s(er)f -(requested.)40 b(Nev)m(ertheless,)31 b(this)e(is)g(regarded)150 -894 y(as)38 b(inadvisable;)g(y)m(ou)g(should)d(instead)i(c)m(hec)m(k)i -Fj(bzerror)d Fl(after)i(ev)m(ery)g(call)e(and)h(w)m(atc)m(h)i(out)f -(for)f Fj(BZ_)150 1004 y(STREAM_END)p Fl(.)150 1160 y(In)m(ternally)-8 -b(,)47 b Fj(BZ2_bzRead)41 b Fl(copies)j(data)g(from)g(the)g(compressed) -g(\014le)f(in)f(c)m(h)m(unks)i(of)g(size)g Fj(BZ_MAX_)150 -1270 y(UNUSED)31 b Fl(b)m(ytes)i(b)s(efore)f(decompressing)f(it.)47 -b(If)32 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Fj(BZ_UNEXPECTED_EOF)663 -2743 y Fl(if)f(the)i(compressed)f(\014le)f(ended)h(b)s(efore)g(the)g -(logical)g(end-of-stream)h(w)m(as)g(detected)572 2847 -y Fj(BZ_DATA_ERROR)663 2950 y Fl(if)e(a)i(data)g(in)m(tegrit)m(y)f -(error)g(w)m(as)h(detected)h(in)d(the)h(compressed)g(stream)572 -3054 y Fj(BZ_DATA_ERROR_MAGIC)663 3158 y Fl(if)f(the)i(stream)f(do)s -(es)g(not)h(b)s(egin)e(with)g(the)i(requisite)e(header)h(b)m(ytes)h -(\(ie,)f(is)g(not)663 3262 y(a)g Fj(bzip2)f Fl(data)i(\014le\).)61 -b(This)28 b(is)i(really)f(a)i(sp)s(ecial)e(case)i(of)g -Fj(BZ_DATA_ERROR)p Fl(.)572 3365 y Fj(BZ_MEM_ERROR)663 -3469 y Fl(if)e(insu\016cien)m(t)g(memory)h(w)m(as)h(a)m(v)-5 -b(ailable)572 3573 y Fj(BZ_STREAM_END)663 3677 y Fl(if)29 -b(the)i(logical)e(end)h(of)h(stream)f(w)m(as)h(detected.)572 -3781 y Fj(BZ_OK)663 3884 y Fl(otherwise.)150 4041 y(P)m(ossible)e -(return)h(v)-5 b(alues:)572 4192 y(n)m(um)m(b)s(er)29 -b(of)h(b)m(ytes)h(read)663 4296 y(if)e Fj(bzerror)f Fl(is)i -Fj(BZ_OK)f Fl(or)h 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Fl(if)29 b(the)i(library)d(has)i -(b)s(een)f(mis-compiled)572 1942 y Fj(BZ_PARAM_ERROR)663 -2046 y Fl(if)g Fj(dest)g Fl(is)h Fj(NULL)f Fl(or)h Fj(destLen)f -Fl(is)g Fj(NULL)663 2150 y Fl(or)h Fj(blockSize100k)44 -b(<)k(1)30 b Fl(or)g Fj(blockSize100k)44 b(>)k(9)663 -2254 y Fl(or)30 b Fj(verbosity)45 b(<)j(0)30 b Fl(or)g -Fj(verbosity)45 b(>)j(4)663 2357 y Fl(or)30 b Fj(workFactor)45 -b(<)j(0)30 b Fl(or)g Fj(workFactor)45 b(>)i(250)572 2461 -y(BZ_MEM_ERROR)663 2565 y Fl(if)29 b(insu\016cien)m(t)g(memory)h(is)f -(a)m(v)-5 b(ailable)572 2669 y Fj(BZ_OUTBUFF_FULL)663 -2773 y Fl(if)29 b(the)i(size)f(of)g(the)h(compressed)f(data)h(exceeds)g -Fj(*destLen)572 2876 y(BZ_OK)663 2980 y Fl(otherwise)150 -3349 y Ff(3.5.2)63 b Fe(BZ2_bzBuffToBuffDecompress)533 -3536 y Fj(int)47 b(BZ2_bzBuffToBuffDecompres)o(s)42 b(\()47 -b(char*)428 b(dest,)2108 3640 y(unsigned)46 b(int*)g(destLen,)2108 -3744 y(char*)428 b(source,)2108 3848 y(unsigned)46 b(int)94 -b(sourceLen,)2108 3951 y(int)524 b(small,)2108 4055 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-b(the)i(library)d(has)i(b)s(een)f(mis-compiled)572 1190 -y Fj(BZ_PARAM_ERROR)663 1294 y Fl(if)g Fj(dest)g Fl(is)h -Fj(NULL)f Fl(or)h Fj(destLen)f Fl(is)g Fj(NULL)663 1398 -y Fl(or)h Fj(small)46 b(!=)i(0)f(&&)g(small)g(!=)g(1)663 -1502 y Fl(or)30 b Fj(verbosity)45 b(<)j(0)30 b Fl(or)g -Fj(verbosity)45 b(>)j(4)572 1605 y(BZ_MEM_ERROR)663 1709 -y Fl(if)29 b(insu\016cien)m(t)g(memory)h(is)f(a)m(v)-5 -b(ailable)572 1813 y Fj(BZ_OUTBUFF_FULL)663 1917 y Fl(if)29 -b(the)i(size)f(of)g(the)h(compressed)f(data)h(exceeds)g -Fj(*destLen)572 2021 y(BZ_DATA_ERROR)663 2124 y Fl(if)e(a)i(data)g(in)m -(tegrit)m(y)f(error)g(w)m(as)h(detected)h(in)d(the)h(compressed)g(data) -572 2228 y Fj(BZ_DATA_ERROR_MAGIC)663 2332 y Fl(if)f(the)i(compressed)f -(data)h(do)s(esn't)f(b)s(egin)f(with)g(the)i(righ)m(t)e(magic)i(b)m -(ytes)572 2436 y Fj(BZ_UNEXPECTED_EOF)663 2539 y Fl(if)e(the)i -(compressed)f(data)h(ends)e(unexp)s(ectedly)572 2643 -y Fj(BZ_OK)663 2747 y Fl(otherwise)150 3116 y Fk(3.6)68 -b Fd(zlib)43 b 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b(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g -(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)54 b Fl(29)449 302 -y(3.8)92 b(Making)30 b(a)h(Windo)m(ws)e(DLL)15 b Fa(.)h(.)f(.)g(.)g(.)g -(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.) -g(.)g(.)g(.)g(.)g(.)h(.)f(.)g(.)g(.)44 b Fl(30)150 545 -y Fk(4)135 b(Miscellanea)11 b Fb(.)21 b(.)f(.)f(.)h(.)f(.)g(.)h(.)f(.)h -(.)f(.)h(.)f(.)g(.)h(.)f(.)h(.)f(.)h(.)f(.)g(.)h(.)f(.)h(.)f(.)h(.)f(.) -h(.)f(.)g(.)h(.)56 b Fk(31)449 682 y Fl(4.1)92 b(Limitations)29 -b(of)h(the)h(compressed)f(\014le)f(format)9 b Fa(.)15 -b(.)h(.)f(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)38 -b Fl(31)449 791 y(4.2)92 b(P)m(ortabilit)m(y)30 b(issues)14 -b Fa(.)f(.)j(.)f(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.) -g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g -(.)g(.)h(.)f(.)g(.)43 b Fl(32)449 901 y(4.3)92 b(Rep)s(orting)29 -b(bugs)f Fa(.)15 b(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g(.)g 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a/winsup/bz2lib/manual.texi +++ /dev/null @@ -1,2215 +0,0 @@ -\input texinfo @c -*- Texinfo -*- -@setfilename bzip2.info - -@ignore -This file documents bzip2 version 1.0, and associated library -libbzip2, written by Julian Seward (jseward@acm.org). - -Copyright (C) 1996-2000 Julian R Seward - -Permission is granted to make and distribute verbatim copies of -this manual provided the copyright notice and this permission notice -are preserved on all copies. - -Permission is granted to copy and distribute translations of this manual -into another language, under the above conditions for verbatim copies. -@end ignore - -@ifinfo -@format -START-INFO-DIR-ENTRY -* Bzip2: (bzip2). A program and library for data compression. -END-INFO-DIR-ENTRY -@end format - -@end ifinfo - -@iftex -@c @finalout -@settitle bzip2 and libbzip2 -@titlepage -@title bzip2 and libbzip2 -@subtitle a program and library for data compression -@subtitle copyright (C) 1996-2000 Julian Seward -@subtitle version 1.0 of 21 March 2000 -@author Julian Seward - -@end titlepage - -@parindent 0mm -@parskip 2mm - -@end iftex -@node Top, Overview, (dir), (dir) - -This program, @code{bzip2}, -and associated library @code{libbzip2}, are -Copyright (C) 1996-2000 Julian R Seward. All rights reserved. - -Redistribution and use in source and binary forms, with or without -modification, are permitted provided that the following conditions -are met: -@itemize @bullet -@item - Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. -@item - The origin of this software must not be misrepresented; you must - not claim that you wrote the original software. If you use this - software in a product, an acknowledgment in the product - documentation would be appreciated but is not required. -@item - Altered source versions must be plainly marked as such, and must - not be misrepresented as being the original software. -@item - The name of the author may not be used to endorse or promote - products derived from this software without specific prior written - permission. -@end itemize -THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS -OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED -WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE -ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY -DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL -DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE -GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS -INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, -WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING -NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS -SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - -Julian Seward, Cambridge, UK. - -@code{jseward@@acm.org} - -@code{http://sourceware.cygnus.com/bzip2} - -@code{http://www.cacheprof.org} - -@code{http://www.muraroa.demon.co.uk} - -@code{bzip2}/@code{libbzip2} version 1.0 of 21 March 2000. - -PATENTS: To the best of my knowledge, @code{bzip2} does not use any patented -algorithms. However, I do not have the resources available to carry out -a full patent search. Therefore I cannot give any guarantee of the -above statement. - - - - - - - -@node Overview, Implementation, Top, Top -@chapter Introduction - -@code{bzip2} compresses files using the Burrows-Wheeler -block-sorting text compression algorithm, and Huffman coding. -Compression is generally considerably better than that -achieved by more conventional LZ77/LZ78-based compressors, -and approaches the performance of the PPM family of statistical compressors. - -@code{bzip2} is built on top of @code{libbzip2}, a flexible library -for handling compressed data in the @code{bzip2} format. This manual -describes both how to use the program and -how to work with the library interface. Most of the -manual is devoted to this library, not the program, -which is good news if your interest is only in the program. - -Chapter 2 describes how to use @code{bzip2}; this is the only part -you need to read if you just want to know how to operate the program. -Chapter 3 describes the programming interfaces in detail, and -Chapter 4 records some miscellaneous notes which I thought -ought to be recorded somewhere. - - -@chapter How to use @code{bzip2} - -This chapter contains a copy of the @code{bzip2} man page, -and nothing else. - -@quotation - -@unnumberedsubsubsec NAME -@itemize -@item @code{bzip2}, @code{bunzip2} -- a block-sorting file compressor, v1.0 -@item @code{bzcat} -- decompresses files to stdout -@item @code{bzip2recover} -- recovers data from damaged bzip2 files -@end itemize - -@unnumberedsubsubsec SYNOPSIS -@itemize -@item @code{bzip2} [ -cdfkqstvzVL123456789 ] [ filenames ... ] -@item @code{bunzip2} [ -fkvsVL ] [ filenames ... ] -@item @code{bzcat} [ -s ] [ filenames ... ] -@item @code{bzip2recover} filename -@end itemize - -@unnumberedsubsubsec DESCRIPTION - -@code{bzip2} compresses files using the Burrows-Wheeler block sorting -text compression algorithm, and Huffman coding. Compression is -generally considerably better than that achieved by more conventional -LZ77/LZ78-based compressors, and approaches the performance of the PPM -family of statistical compressors. - -The command-line options are deliberately very similar to those of GNU -@code{gzip}, but they are not identical. - -@code{bzip2} expects a list of file names to accompany the command-line -flags. Each file is replaced by a compressed version of itself, with -the name @code{original_name.bz2}. Each compressed file has the same -modification date, permissions, and, when possible, ownership as the -corresponding original, so that these properties can be correctly -restored at decompression time. File name handling is naive in the -sense that there is no mechanism for preserving original file names, -permissions, ownerships or dates in filesystems which lack these -concepts, or have serious file name length restrictions, such as MS-DOS. - -@code{bzip2} and @code{bunzip2} will by default not overwrite existing -files. If you want this to happen, specify the @code{-f} flag. - -If no file names are specified, @code{bzip2} compresses from standard -input to standard output. In this case, @code{bzip2} will decline to -write compressed output to a terminal, as this would be entirely -incomprehensible and therefore pointless. - -@code{bunzip2} (or @code{bzip2 -d}) decompresses all -specified files. Files which were not created by @code{bzip2} -will be detected and ignored, and a warning issued. -@code{bzip2} attempts to guess the filename for the decompressed file -from that of the compressed file as follows: -@itemize -@item @code{filename.bz2 } becomes @code{filename} -@item @code{filename.bz } becomes @code{filename} -@item @code{filename.tbz2} becomes @code{filename.tar} -@item @code{filename.tbz } becomes @code{filename.tar} -@item @code{anyothername } becomes @code{anyothername.out} -@end itemize -If the file does not end in one of the recognised endings, -@code{.bz2}, @code{.bz}, -@code{.tbz2} or @code{.tbz}, @code{bzip2} complains that it cannot -guess the name of the original file, and uses the original name -with @code{.out} appended. - -As with compression, supplying no -filenames causes decompression from standard input to standard output. - -@code{bunzip2} will correctly decompress a file which is the -concatenation of two or more compressed files. The result is the -concatenation of the corresponding uncompressed files. Integrity -testing (@code{-t}) of concatenated compressed files is also supported. - -You can also compress or decompress files to the standard output by -giving the @code{-c} flag. Multiple files may be compressed and -decompressed like this. The resulting outputs are fed sequentially to -stdout. Compression of multiple files in this manner generates a stream -containing multiple compressed file representations. Such a stream -can be decompressed correctly only by @code{bzip2} version 0.9.0 or -later. Earlier versions of @code{bzip2} will stop after decompressing -the first file in the stream. - -@code{bzcat} (or @code{bzip2 -dc}) decompresses all specified files to -the standard output. - -@code{bzip2} will read arguments from the environment variables -@code{BZIP2} and @code{BZIP}, in that order, and will process them -before any arguments read from the command line. This gives a -convenient way to supply default arguments. - -Compression is always performed, even if the compressed file is slightly -larger than the original. Files of less than about one hundred bytes -tend to get larger, since the compression mechanism has a constant -overhead in the region of 50 bytes. Random data (including the output -of most file compressors) is coded at about 8.05 bits per byte, giving -an expansion of around 0.5%. - -As a self-check for your protection, @code{bzip2} uses 32-bit CRCs to -make sure that the decompressed version of a file is identical to the -original. This guards against corruption of the compressed data, and -against undetected bugs in @code{bzip2} (hopefully very unlikely). The -chances of data corruption going undetected is microscopic, about one -chance in four billion for each file processed. Be aware, though, that -the check occurs upon decompression, so it can only tell you that -something is wrong. It can't help you recover the original uncompressed -data. You can use @code{bzip2recover} to try to recover data from -damaged files. - -Return values: 0 for a normal exit, 1 for environmental problems (file -not found, invalid flags, I/O errors, &c), 2 to indicate a corrupt -compressed file, 3 for an internal consistency error (eg, bug) which -caused @code{bzip2} to panic. - - -@unnumberedsubsubsec OPTIONS -@table @code -@item -c --stdout -Compress or decompress to standard output. -@item -d --decompress -Force decompression. @code{bzip2}, @code{bunzip2} and @code{bzcat} are -really the same program, and the decision about what actions to take is -done on the basis of which name is used. This flag overrides that -mechanism, and forces bzip2 to decompress. -@item -z --compress -The complement to @code{-d}: forces compression, regardless of the -invokation name. -@item -t --test -Check integrity of the specified file(s), but don't decompress them. -This really performs a trial decompression and throws away the result. -@item -f --force -Force overwrite of output files. Normally, @code{bzip2} will not overwrite -existing output files. Also forces @code{bzip2} to break hard links -to files, which it otherwise wouldn't do. -@item -k --keep -Keep (don't delete) input files during compression -or decompression. -@item -s --small -Reduce memory usage, for compression, decompression and testing. Files -are decompressed and tested using a modified algorithm which only -requires 2.5 bytes per block byte. This means any file can be -decompressed in 2300k of memory, albeit at about half the normal speed. - -During compression, @code{-s} selects a block size of 200k, which limits -memory use to around the same figure, at the expense of your compression -ratio. In short, if your machine is low on memory (8 megabytes or -less), use -s for everything. See MEMORY MANAGEMENT below. -@item -q --quiet -Suppress non-essential warning messages. Messages pertaining to -I/O errors and other critical events will not be suppressed. -@item -v --verbose -Verbose mode -- show the compression ratio for each file processed. -Further @code{-v}'s increase the verbosity level, spewing out lots of -information which is primarily of interest for diagnostic purposes. -@item -L --license -V --version -Display the software version, license terms and conditions. -@item -1 to -9 -Set the block size to 100 k, 200 k .. 900 k when compressing. Has no -effect when decompressing. See MEMORY MANAGEMENT below. -@item -- -Treats all subsequent arguments as file names, even if they start -with a dash. This is so you can handle files with names beginning -with a dash, for example: @code{bzip2 -- -myfilename}. -@item --repetitive-fast -@item --repetitive-best -These flags are redundant in versions 0.9.5 and above. They provided -some coarse control over the behaviour of the sorting algorithm in -earlier versions, which was sometimes useful. 0.9.5 and above have an -improved algorithm which renders these flags irrelevant. -@end table - - -@unnumberedsubsubsec MEMORY MANAGEMENT - -@code{bzip2} compresses large files in blocks. The block size affects -both the compression ratio achieved, and the amount of memory needed for -compression and decompression. The flags @code{-1} through @code{-9} -specify the block size to be 100,000 bytes through 900,000 bytes (the -default) respectively. At decompression time, the block size used for -compression is read from the header of the compressed file, and -@code{bunzip2} then allocates itself just enough memory to decompress -the file. Since block sizes are stored in compressed files, it follows -that the flags @code{-1} to @code{-9} are irrelevant to and so ignored -during decompression. - -Compression and decompression requirements, in bytes, can be estimated -as: -@example - Compression: 400k + ( 8 x block size ) - - Decompression: 100k + ( 4 x block size ), or - 100k + ( 2.5 x block size ) -@end example -Larger block sizes give rapidly diminishing marginal returns. Most of -the compression comes from the first two or three hundred k of block -size, a fact worth bearing in mind when using @code{bzip2} on small machines. -It is also important to appreciate that the decompression memory -requirement is set at compression time by the choice of block size. - -For files compressed with the default 900k block size, @code{bunzip2} -will require about 3700 kbytes to decompress. To support decompression -of any file on a 4 megabyte machine, @code{bunzip2} has an option to -decompress using approximately half this amount of memory, about 2300 -kbytes. Decompression speed is also halved, so you should use this -option only where necessary. The relevant flag is @code{-s}. - -In general, try and use the largest block size memory constraints allow, -since that maximises the compression achieved. Compression and -decompression speed are virtually unaffected by block size. - -Another significant point applies to files which fit in a single block --- that means most files you'd encounter using a large block size. The -amount of real memory touched is proportional to the size of the file, -since the file is smaller than a block. For example, compressing a file -20,000 bytes long with the flag @code{-9} will cause the compressor to -allocate around 7600k of memory, but only touch 400k + 20000 * 8 = 560 -kbytes of it. Similarly, the decompressor will allocate 3700k but only -touch 100k + 20000 * 4 = 180 kbytes. - -Here is a table which summarises the maximum memory usage for different -block sizes. Also recorded is the total compressed size for 14 files of -the Calgary Text Compression Corpus totalling 3,141,622 bytes. This -column gives some feel for how compression varies with block size. -These figures tend to understate the advantage of larger block sizes for -larger files, since the Corpus is dominated by smaller files. -@example - Compress Decompress Decompress Corpus - Flag usage usage -s usage Size - - -1 1200k 500k 350k 914704 - -2 2000k 900k 600k 877703 - -3 2800k 1300k 850k 860338 - -4 3600k 1700k 1100k 846899 - -5 4400k 2100k 1350k 845160 - -6 5200k 2500k 1600k 838626 - -7 6100k 2900k 1850k 834096 - -8 6800k 3300k 2100k 828642 - -9 7600k 3700k 2350k 828642 -@end example - -@unnumberedsubsubsec RECOVERING DATA FROM DAMAGED FILES - -@code{bzip2} compresses files in blocks, usually 900kbytes long. Each -block is handled independently. If a media or transmission error causes -a multi-block @code{.bz2} file to become damaged, it may be possible to -recover data from the undamaged blocks in the file. - -The compressed representation of each block is delimited by a 48-bit -pattern, which makes it possible to find the block boundaries with -reasonable certainty. Each block also carries its own 32-bit CRC, so -damaged blocks can be distinguished from undamaged ones. - -@code{bzip2recover} is a simple program whose purpose is to search for -blocks in @code{.bz2} files, and write each block out into its own -@code{.bz2} file. You can then use @code{bzip2 -t} to test the -integrity of the resulting files, and decompress those which are -undamaged. - -@code{bzip2recover} -takes a single argument, the name of the damaged file, -and writes a number of files @code{rec0001file.bz2}, - @code{rec0002file.bz2}, etc, containing the extracted blocks. - The output filenames are designed so that the use of - wildcards in subsequent processing -- for example, -@code{bzip2 -dc rec*file.bz2 > recovered_data} -- lists the files in - the correct order. - -@code{bzip2recover} should be of most use dealing with large @code{.bz2} - files, as these will contain many blocks. It is clearly - futile to use it on damaged single-block files, since a - damaged block cannot be recovered. If you wish to minimise -any potential data loss through media or transmission errors, -you might consider compressing with a smaller - block size. - - -@unnumberedsubsubsec PERFORMANCE NOTES - -The sorting phase of compression gathers together similar strings in the -file. Because of this, files containing very long runs of repeated -symbols, like "aabaabaabaab ..." (repeated several hundred times) may -compress more slowly than normal. Versions 0.9.5 and above fare much -better than previous versions in this respect. The ratio between -worst-case and average-case compression time is in the region of 10:1. -For previous versions, this figure was more like 100:1. You can use the -@code{-vvvv} option to monitor progress in great detail, if you want. - -Decompression speed is unaffected by these phenomena. - -@code{bzip2} usually allocates several megabytes of memory to operate -in, and then charges all over it in a fairly random fashion. This means -that performance, both for compressing and decompressing, is largely -determined by the speed at which your machine can service cache misses. -Because of this, small changes to the code to reduce the miss rate have -been observed to give disproportionately large performance improvements. -I imagine @code{bzip2} will perform best on machines with very large -caches. - - -@unnumberedsubsubsec CAVEATS - -I/O error messages are not as helpful as they could be. @code{bzip2} -tries hard to detect I/O errors and exit cleanly, but the details of -what the problem is sometimes seem rather misleading. - -This manual page pertains to version 1.0 of @code{bzip2}. Compressed -data created by this version is entirely forwards and backwards -compatible with the previous public releases, versions 0.1pl2, 0.9.0 and -0.9.5, but with the following exception: 0.9.0 and above can correctly -decompress multiple concatenated compressed files. 0.1pl2 cannot do -this; it will stop after decompressing just the first file in the -stream. - -@code{bzip2recover} uses 32-bit integers to represent bit positions in -compressed files, so it cannot handle compressed files more than 512 -megabytes long. This could easily be fixed. - - -@unnumberedsubsubsec AUTHOR -Julian Seward, @code{jseward@@acm.org}. - -The ideas embodied in @code{bzip2} are due to (at least) the following -people: Michael Burrows and David Wheeler (for the block sorting -transformation), David Wheeler (again, for the Huffman coder), Peter -Fenwick (for the structured coding model in the original @code{bzip}, -and many refinements), and Alistair Moffat, Radford Neal and Ian Witten -(for the arithmetic coder in the original @code{bzip}). I am much -indebted for their help, support and advice. See the manual in the -source distribution for pointers to sources of documentation. Christian -von Roques encouraged me to look for faster sorting algorithms, so as to -speed up compression. Bela Lubkin encouraged me to improve the -worst-case compression performance. Many people sent patches, helped -with portability problems, lent machines, gave advice and were generally -helpful. - -@end quotation - - - - -@chapter Programming with @code{libbzip2} - -This chapter describes the programming interface to @code{libbzip2}. - -For general background information, particularly about memory -use and performance aspects, you'd be well advised to read Chapter 2 -as well. - -@section Top-level structure - -@code{libbzip2} is a flexible library for compressing and decompressing -data in the @code{bzip2} data format. Although packaged as a single -entity, it helps to regard the library as three separate parts: the low -level interface, and the high level interface, and some utility -functions. - -The structure of @code{libbzip2}'s interfaces is similar to -that of Jean-loup Gailly's and Mark Adler's excellent @code{zlib} -library. - -All externally visible symbols have names beginning @code{BZ2_}. -This is new in version 1.0. The intention is to minimise pollution -of the namespaces of library clients. - -@subsection Low-level summary - -This interface provides services for compressing and decompressing -data in memory. There's no provision for dealing with files, streams -or any other I/O mechanisms, just straight memory-to-memory work. -In fact, this part of the library can be compiled without inclusion -of @code{stdio.h}, which may be helpful for embedded applications. - -The low-level part of the library has no global variables and -is therefore thread-safe. - -Six routines make up the low level interface: -@code{BZ2_bzCompressInit}, @code{BZ2_bzCompress}, and @* @code{BZ2_bzCompressEnd} -for compression, -and a corresponding trio @code{BZ2_bzDecompressInit}, @* @code{BZ2_bzDecompress} -and @code{BZ2_bzDecompressEnd} for decompression. -The @code{*Init} functions allocate -memory for compression/decompression and do other -initialisations, whilst the @code{*End} functions close down operations -and release memory. - -The real work is done by @code{BZ2_bzCompress} and @code{BZ2_bzDecompress}. -These compress and decompress data from a user-supplied input buffer -to a user-supplied output buffer. These buffers can be any size; -arbitrary quantities of data are handled by making repeated calls -to these functions. This is a flexible mechanism allowing a -consumer-pull style of activity, or producer-push, or a mixture of -both. - - - -@subsection High-level summary - -This interface provides some handy wrappers around the low-level -interface to facilitate reading and writing @code{bzip2} format -files (@code{.bz2} files). The routines provide hooks to facilitate -reading files in which the @code{bzip2} data stream is embedded -within some larger-scale file structure, or where there are -multiple @code{bzip2} data streams concatenated end-to-end. - -For reading files, @code{BZ2_bzReadOpen}, @code{BZ2_bzRead}, -@code{BZ2_bzReadClose} and @* @code{BZ2_bzReadGetUnused} are supplied. For -writing files, @code{BZ2_bzWriteOpen}, @code{BZ2_bzWrite} and -@code{BZ2_bzWriteFinish} are available. - -As with the low-level library, no global variables are used -so the library is per se thread-safe. However, if I/O errors -occur whilst reading or writing the underlying compressed files, -you may have to consult @code{errno} to determine the cause of -the error. In that case, you'd need a C library which correctly -supports @code{errno} in a multithreaded environment. - -To make the library a little simpler and more portable, -@code{BZ2_bzReadOpen} and @code{BZ2_bzWriteOpen} require you to pass them file -handles (@code{FILE*}s) which have previously been opened for reading or -writing respectively. That avoids portability problems associated with -file operations and file attributes, whilst not being much of an -imposition on the programmer. - - - -@subsection Utility functions summary -For very simple needs, @code{BZ2_bzBuffToBuffCompress} and -@code{BZ2_bzBuffToBuffDecompress} are provided. These compress -data in memory from one buffer to another buffer in a single -function call. You should assess whether these functions -fulfill your memory-to-memory compression/decompression -requirements before investing effort in understanding the more -general but more complex low-level interface. - -Yoshioka Tsuneo (@code{QWF00133@@niftyserve.or.jp} / -@code{tsuneo-y@@is.aist-nara.ac.jp}) has contributed some functions to -give better @code{zlib} compatibility. These functions are -@code{BZ2_bzopen}, @code{BZ2_bzread}, @code{BZ2_bzwrite}, @code{BZ2_bzflush}, -@code{BZ2_bzclose}, -@code{BZ2_bzerror} and @code{BZ2_bzlibVersion}. You may find these functions -more convenient for simple file reading and writing, than those in the -high-level interface. These functions are not (yet) officially part of -the library, and are minimally documented here. If they break, you -get to keep all the pieces. I hope to document them properly when time -permits. - -Yoshioka also contributed modifications to allow the library to be -built as a Windows DLL. - - -@section Error handling - -The library is designed to recover cleanly in all situations, including -the worst-case situation of decompressing random data. I'm not -100% sure that it can always do this, so you might want to add -a signal handler to catch segmentation violations during decompression -if you are feeling especially paranoid. I would be interested in -hearing more about the robustness of the library to corrupted -compressed data. - -Version 1.0 is much more robust in this respect than -0.9.0 or 0.9.5. Investigations with Checker (a tool for -detecting problems with memory management, similar to Purify) -indicate that, at least for the few files I tested, all single-bit -errors in the decompressed data are caught properly, with no -segmentation faults, no reads of uninitialised data and no -out of range reads or writes. So it's certainly much improved, -although I wouldn't claim it to be totally bombproof. - -The file @code{bzlib.h} contains all definitions needed to use -the library. In particular, you should definitely not include -@code{bzlib_private.h}. - -In @code{bzlib.h}, the various return values are defined. The following -list is not intended as an exhaustive description of the circumstances -in which a given value may be returned -- those descriptions are given -later. Rather, it is intended to convey the rough meaning of each -return value. The first five actions are normal and not intended to -denote an error situation. -@table @code -@item BZ_OK -The requested action was completed successfully. -@item BZ_RUN_OK -@itemx BZ_FLUSH_OK -@itemx BZ_FINISH_OK -In @code{BZ2_bzCompress}, the requested flush/finish/nothing-special action -was completed successfully. -@item BZ_STREAM_END -Compression of data was completed, or the logical stream end was -detected during decompression. -@end table - -The following return values indicate an error of some kind. -@table @code -@item BZ_CONFIG_ERROR -Indicates that the library has been improperly compiled on your -platform -- a major configuration error. Specifically, it means -that @code{sizeof(char)}, @code{sizeof(short)} and @code{sizeof(int)} -are not 1, 2 and 4 respectively, as they should be. Note that the -library should still work properly on 64-bit platforms which follow -the LP64 programming model -- that is, where @code{sizeof(long)} -and @code{sizeof(void*)} are 8. Under LP64, @code{sizeof(int)} is -still 4, so @code{libbzip2}, which doesn't use the @code{long} type, -is OK. -@item BZ_SEQUENCE_ERROR -When using the library, it is important to call the functions in the -correct sequence and with data structures (buffers etc) in the correct -states. @code{libbzip2} checks as much as it can to ensure this is -happening, and returns @code{BZ_SEQUENCE_ERROR} if not. Code which -complies precisely with the function semantics, as detailed below, -should never receive this value; such an event denotes buggy code -which you should investigate. -@item BZ_PARAM_ERROR -Returned when a parameter to a function call is out of range -or otherwise manifestly incorrect. As with @code{BZ_SEQUENCE_ERROR}, -this denotes a bug in the client code. The distinction between -@code{BZ_PARAM_ERROR} and @code{BZ_SEQUENCE_ERROR} is a bit hazy, but still worth -making. -@item BZ_MEM_ERROR -Returned when a request to allocate memory failed. Note that the -quantity of memory needed to decompress a stream cannot be determined -until the stream's header has been read. So @code{BZ2_bzDecompress} and -@code{BZ2_bzRead} may return @code{BZ_MEM_ERROR} even though some of -the compressed data has been read. The same is not true for -compression; once @code{BZ2_bzCompressInit} or @code{BZ2_bzWriteOpen} have -successfully completed, @code{BZ_MEM_ERROR} cannot occur. -@item BZ_DATA_ERROR -Returned when a data integrity error is detected during decompression. -Most importantly, this means when stored and computed CRCs for the -data do not match. This value is also returned upon detection of any -other anomaly in the compressed data. -@item BZ_DATA_ERROR_MAGIC -As a special case of @code{BZ_DATA_ERROR}, it is sometimes useful to -know when the compressed stream does not start with the correct -magic bytes (@code{'B' 'Z' 'h'}). -@item BZ_IO_ERROR -Returned by @code{BZ2_bzRead} and @code{BZ2_bzWrite} when there is an error -reading or writing in the compressed file, and by @code{BZ2_bzReadOpen} -and @code{BZ2_bzWriteOpen} for attempts to use a file for which the -error indicator (viz, @code{ferror(f)}) is set. -On receipt of @code{BZ_IO_ERROR}, the caller should consult -@code{errno} and/or @code{perror} to acquire operating-system -specific information about the problem. -@item BZ_UNEXPECTED_EOF -Returned by @code{BZ2_bzRead} when the compressed file finishes -before the logical end of stream is detected. -@item BZ_OUTBUFF_FULL -Returned by @code{BZ2_bzBuffToBuffCompress} and -@code{BZ2_bzBuffToBuffDecompress} to indicate that the output data -will not fit into the output buffer provided. -@end table - - - -@section Low-level interface - -@subsection @code{BZ2_bzCompressInit} -@example -typedef - struct @{ - char *next_in; - unsigned int avail_in; - unsigned int total_in_lo32; - unsigned int total_in_hi32; - - char *next_out; - unsigned int avail_out; - unsigned int total_out_lo32; - unsigned int total_out_hi32; - - void *state; - - void *(*bzalloc)(void *,int,int); - void (*bzfree)(void *,void *); - void *opaque; - @} - bz_stream; - -int BZ2_bzCompressInit ( bz_stream *strm, - int blockSize100k, - int verbosity, - int workFactor ); - -@end example - -Prepares for compression. The @code{bz_stream} structure -holds all data pertaining to the compression activity. -A @code{bz_stream} structure should be allocated and initialised -prior to the call. -The fields of @code{bz_stream} -comprise the entirety of the user-visible data. @code{state} -is a pointer to the private data structures required for compression. - -Custom memory allocators are supported, via fields @code{bzalloc}, -@code{bzfree}, -and @code{opaque}. The value -@code{opaque} is passed to as the first argument to -all calls to @code{bzalloc} and @code{bzfree}, but is -otherwise ignored by the library. -The call @code{bzalloc ( opaque, n, m )} is expected to return a -pointer @code{p} to -@code{n * m} bytes of memory, and @code{bzfree ( opaque, p )} -should free -that memory. - -If you don't want to use a custom memory allocator, set @code{bzalloc}, -@code{bzfree} and -@code{opaque} to @code{NULL}, -and the library will then use the standard @code{malloc}/@code{free} -routines. - -Before calling @code{BZ2_bzCompressInit}, fields @code{bzalloc}, -@code{bzfree} and @code{opaque} should -be filled appropriately, as just described. Upon return, the internal -state will have been allocated and initialised, and @code{total_in_lo32}, -@code{total_in_hi32}, @code{total_out_lo32} and -@code{total_out_hi32} will have been set to zero. -These four fields are used by the library -to inform the caller of the total amount of data passed into and out of -the library, respectively. You should not try to change them. -As of version 1.0, 64-bit counts are maintained, even on 32-bit -platforms, using the @code{_hi32} fields to store the upper 32 bits -of the count. So, for example, the total amount of data in -is @code{(total_in_hi32 << 32) + total_in_lo32}. - -Parameter @code{blockSize100k} specifies the block size to be used for -compression. It should be a value between 1 and 9 inclusive, and the -actual block size used is 100000 x this figure. 9 gives the best -compression but takes most memory. - -Parameter @code{verbosity} should be set to a number between 0 and 4 -inclusive. 0 is silent, and greater numbers give increasingly verbose -monitoring/debugging output. If the library has been compiled with -@code{-DBZ_NO_STDIO}, no such output will appear for any verbosity -setting. - -Parameter @code{workFactor} controls how the compression phase behaves -when presented with worst case, highly repetitive, input data. If -compression runs into difficulties caused by repetitive data, the -library switches from the standard sorting algorithm to a fallback -algorithm. The fallback is slower than the standard algorithm by -perhaps a factor of three, but always behaves reasonably, no matter how -bad the input. - -Lower values of @code{workFactor} reduce the amount of effort the -standard algorithm will expend before resorting to the fallback. You -should set this parameter carefully; too low, and many inputs will be -handled by the fallback algorithm and so compress rather slowly, too -high, and your average-to-worst case compression times can become very -large. The default value of 30 gives reasonable behaviour over a wide -range of circumstances. - -Allowable values range from 0 to 250 inclusive. 0 is a special case, -equivalent to using the default value of 30. - -Note that the compressed output generated is the same regardless of -whether or not the fallback algorithm is used. - -Be aware also that this parameter may disappear entirely in future -versions of the library. In principle it should be possible to devise a -good way to automatically choose which algorithm to use. Such a -mechanism would render the parameter obsolete. - -Possible return values: -@display - @code{BZ_CONFIG_ERROR} - if the library has been mis-compiled - @code{BZ_PARAM_ERROR} - if @code{strm} is @code{NULL} - or @code{blockSize} < 1 or @code{blockSize} > 9 - or @code{verbosity} < 0 or @code{verbosity} > 4 - or @code{workFactor} < 0 or @code{workFactor} > 250 - @code{BZ_MEM_ERROR} - if not enough memory is available - @code{BZ_OK} - otherwise -@end display -Allowable next actions: -@display - @code{BZ2_bzCompress} - if @code{BZ_OK} is returned - no specific action needed in case of error -@end display - -@subsection @code{BZ2_bzCompress} -@example - int BZ2_bzCompress ( bz_stream *strm, int action ); -@end example -Provides more input and/or output buffer space for the library. The -caller maintains input and output buffers, and calls @code{BZ2_bzCompress} to -transfer data between them. - -Before each call to @code{BZ2_bzCompress}, @code{next_in} should point at -the data to be compressed, and @code{avail_in} should indicate how many -bytes the library may read. @code{BZ2_bzCompress} updates @code{next_in}, -@code{avail_in} and @code{total_in} to reflect the number of bytes it -has read. - -Similarly, @code{next_out} should point to a buffer in which the -compressed data is to be placed, with @code{avail_out} indicating how -much output space is available. @code{BZ2_bzCompress} updates -@code{next_out}, @code{avail_out} and @code{total_out} to reflect the -number of bytes output. - -You may provide and remove as little or as much data as you like on each -call of @code{BZ2_bzCompress}. In the limit, it is acceptable to supply and -remove data one byte at a time, although this would be terribly -inefficient. You should always ensure that at least one byte of output -space is available at each call. - -A second purpose of @code{BZ2_bzCompress} is to request a change of mode of the -compressed stream. - -Conceptually, a compressed stream can be in one of four states: IDLE, -RUNNING, FLUSHING and FINISHING. Before initialisation -(@code{BZ2_bzCompressInit}) and after termination (@code{BZ2_bzCompressEnd}), a -stream is regarded as IDLE. - -Upon initialisation (@code{BZ2_bzCompressInit}), the stream is placed in the -RUNNING state. Subsequent calls to @code{BZ2_bzCompress} should pass -@code{BZ_RUN} as the requested action; other actions are illegal and -will result in @code{BZ_SEQUENCE_ERROR}. - -At some point, the calling program will have provided all the input data -it wants to. It will then want to finish up -- in effect, asking the -library to process any data it might have buffered internally. In this -state, @code{BZ2_bzCompress} will no longer attempt to read data from -@code{next_in}, but it will want to write data to @code{next_out}. -Because the output buffer supplied by the user can be arbitrarily small, -the finishing-up operation cannot necessarily be done with a single call -of @code{BZ2_bzCompress}. - -Instead, the calling program passes @code{BZ_FINISH} as an action to -@code{BZ2_bzCompress}. This changes the stream's state to FINISHING. Any -remaining input (ie, @code{next_in[0 .. avail_in-1]}) is compressed and -transferred to the output buffer. To do this, @code{BZ2_bzCompress} must be -called repeatedly until all the output has been consumed. At that -point, @code{BZ2_bzCompress} returns @code{BZ_STREAM_END}, and the stream's -state is set back to IDLE. @code{BZ2_bzCompressEnd} should then be -called. - -Just to make sure the calling program does not cheat, the library makes -a note of @code{avail_in} at the time of the first call to -@code{BZ2_bzCompress} which has @code{BZ_FINISH} as an action (ie, at the -time the program has announced its intention to not supply any more -input). By comparing this value with that of @code{avail_in} over -subsequent calls to @code{BZ2_bzCompress}, the library can detect any -attempts to slip in more data to compress. Any calls for which this is -detected will return @code{BZ_SEQUENCE_ERROR}. This indicates a -programming mistake which should be corrected. - -Instead of asking to finish, the calling program may ask -@code{BZ2_bzCompress} to take all the remaining input, compress it and -terminate the current (Burrows-Wheeler) compression block. This could -be useful for error control purposes. The mechanism is analogous to -that for finishing: call @code{BZ2_bzCompress} with an action of -@code{BZ_FLUSH}, remove output data, and persist with the -@code{BZ_FLUSH} action until the value @code{BZ_RUN} is returned. As -with finishing, @code{BZ2_bzCompress} detects any attempt to provide more -input data once the flush has begun. - -Once the flush is complete, the stream returns to the normal RUNNING -state. - -This all sounds pretty complex, but isn't really. Here's a table -which shows which actions are allowable in each state, what action -will be taken, what the next state is, and what the non-error return -values are. Note that you can't explicitly ask what state the -stream is in, but nor do you need to -- it can be inferred from the -values returned by @code{BZ2_bzCompress}. -@display -IDLE/@code{any} - Illegal. IDLE state only exists after @code{BZ2_bzCompressEnd} or - before @code{BZ2_bzCompressInit}. - Return value = @code{BZ_SEQUENCE_ERROR} - -RUNNING/@code{BZ_RUN} - Compress from @code{next_in} to @code{next_out} as much as possible. - Next state = RUNNING - Return value = @code{BZ_RUN_OK} - -RUNNING/@code{BZ_FLUSH} - Remember current value of @code{next_in}. Compress from @code{next_in} - to @code{next_out} as much as possible, but do not accept any more input. - Next state = FLUSHING - Return value = @code{BZ_FLUSH_OK} - -RUNNING/@code{BZ_FINISH} - Remember current value of @code{next_in}. Compress from @code{next_in} - to @code{next_out} as much as possible, but do not accept any more input. - Next state = FINISHING - Return value = @code{BZ_FINISH_OK} - -FLUSHING/@code{BZ_FLUSH} - Compress from @code{next_in} to @code{next_out} as much as possible, - but do not accept any more input. - If all the existing input has been used up and all compressed - output has been removed - Next state = RUNNING; Return value = @code{BZ_RUN_OK} - else - Next state = FLUSHING; Return value = @code{BZ_FLUSH_OK} - -FLUSHING/other - Illegal. - Return value = @code{BZ_SEQUENCE_ERROR} - -FINISHING/@code{BZ_FINISH} - Compress from @code{next_in} to @code{next_out} as much as possible, - but to not accept any more input. - If all the existing input has been used up and all compressed - output has been removed - Next state = IDLE; Return value = @code{BZ_STREAM_END} - else - Next state = FINISHING; Return value = @code{BZ_FINISHING} - -FINISHING/other - Illegal. - Return value = @code{BZ_SEQUENCE_ERROR} -@end display - -That still looks complicated? Well, fair enough. The usual sequence -of calls for compressing a load of data is: -@itemize @bullet -@item Get started with @code{BZ2_bzCompressInit}. -@item Shovel data in and shlurp out its compressed form using zero or more -calls of @code{BZ2_bzCompress} with action = @code{BZ_RUN}. -@item Finish up. -Repeatedly call @code{BZ2_bzCompress} with action = @code{BZ_FINISH}, -copying out the compressed output, until @code{BZ_STREAM_END} is returned. -@item Close up and go home. Call @code{BZ2_bzCompressEnd}. -@end itemize -If the data you want to compress fits into your input buffer all -at once, you can skip the calls of @code{BZ2_bzCompress ( ..., BZ_RUN )} and -just do the @code{BZ2_bzCompress ( ..., BZ_FINISH )} calls. - -All required memory is allocated by @code{BZ2_bzCompressInit}. The -compression library can accept any data at all (obviously). So you -shouldn't get any error return values from the @code{BZ2_bzCompress} calls. -If you do, they will be @code{BZ_SEQUENCE_ERROR}, and indicate a bug in -your programming. - -Trivial other possible return values: -@display - @code{BZ_PARAM_ERROR} - if @code{strm} is @code{NULL}, or @code{strm->s} is @code{NULL} -@end display - -@subsection @code{BZ2_bzCompressEnd} -@example -int BZ2_bzCompressEnd ( bz_stream *strm ); -@end example -Releases all memory associated with a compression stream. - -Possible return values: -@display - @code{BZ_PARAM_ERROR} if @code{strm} is @code{NULL} or @code{strm->s} is @code{NULL} - @code{BZ_OK} otherwise -@end display - - -@subsection @code{BZ2_bzDecompressInit} -@example -int BZ2_bzDecompressInit ( bz_stream *strm, int verbosity, int small ); -@end example -Prepares for decompression. As with @code{BZ2_bzCompressInit}, a -@code{bz_stream} record should be allocated and initialised before the -call. Fields @code{bzalloc}, @code{bzfree} and @code{opaque} should be -set if a custom memory allocator is required, or made @code{NULL} for -the normal @code{malloc}/@code{free} routines. Upon return, the internal -state will have been initialised, and @code{total_in} and -@code{total_out} will be zero. - -For the meaning of parameter @code{verbosity}, see @code{BZ2_bzCompressInit}. - -If @code{small} is nonzero, the library will use an alternative -decompression algorithm which uses less memory but at the cost of -decompressing more slowly (roughly speaking, half the speed, but the -maximum memory requirement drops to around 2300k). See Chapter 2 for -more information on memory management. - -Note that the amount of memory needed to decompress -a stream cannot be determined until the stream's header has been read, -so even if @code{BZ2_bzDecompressInit} succeeds, a subsequent -@code{BZ2_bzDecompress} could fail with @code{BZ_MEM_ERROR}. - -Possible return values: -@display - @code{BZ_CONFIG_ERROR} - if the library has been mis-compiled - @code{BZ_PARAM_ERROR} - if @code{(small != 0 && small != 1)} - or @code{(verbosity < 0 || verbosity > 4)} - @code{BZ_MEM_ERROR} - if insufficient memory is available -@end display - -Allowable next actions: -@display - @code{BZ2_bzDecompress} - if @code{BZ_OK} was returned - no specific action required in case of error -@end display - - - -@subsection @code{BZ2_bzDecompress} -@example -int BZ2_bzDecompress ( bz_stream *strm ); -@end example -Provides more input and/out output buffer space for the library. The -caller maintains input and output buffers, and uses @code{BZ2_bzDecompress} -to transfer data between them. - -Before each call to @code{BZ2_bzDecompress}, @code{next_in} -should point at the compressed data, -and @code{avail_in} should indicate how many bytes the library -may read. @code{BZ2_bzDecompress} updates @code{next_in}, @code{avail_in} -and @code{total_in} -to reflect the number of bytes it has read. - -Similarly, @code{next_out} should point to a buffer in which the uncompressed -output is to be placed, with @code{avail_out} indicating how much output space -is available. @code{BZ2_bzCompress} updates @code{next_out}, -@code{avail_out} and @code{total_out} to reflect -the number of bytes output. - -You may provide and remove as little or as much data as you like on -each call of @code{BZ2_bzDecompress}. -In the limit, it is acceptable to -supply and remove data one byte at a time, although this would be -terribly inefficient. You should always ensure that at least one -byte of output space is available at each call. - -Use of @code{BZ2_bzDecompress} is simpler than @code{BZ2_bzCompress}. - -You should provide input and remove output as described above, and -repeatedly call @code{BZ2_bzDecompress} until @code{BZ_STREAM_END} is -returned. Appearance of @code{BZ_STREAM_END} denotes that -@code{BZ2_bzDecompress} has detected the logical end of the compressed -stream. @code{BZ2_bzDecompress} will not produce @code{BZ_STREAM_END} until -all output data has been placed into the output buffer, so once -@code{BZ_STREAM_END} appears, you are guaranteed to have available all -the decompressed output, and @code{BZ2_bzDecompressEnd} can safely be -called. - -If case of an error return value, you should call @code{BZ2_bzDecompressEnd} -to clean up and release memory. - -Possible return values: -@display - @code{BZ_PARAM_ERROR} - if @code{strm} is @code{NULL} or @code{strm->s} is @code{NULL} - or @code{strm->avail_out < 1} - @code{BZ_DATA_ERROR} - if a data integrity error is detected in the compressed stream - @code{BZ_DATA_ERROR_MAGIC} - if the compressed stream doesn't begin with the right magic bytes - @code{BZ_MEM_ERROR} - if there wasn't enough memory available - @code{BZ_STREAM_END} - if the logical end of the data stream was detected and all - output in has been consumed, eg @code{s->avail_out > 0} - @code{BZ_OK} - otherwise -@end display -Allowable next actions: -@display - @code{BZ2_bzDecompress} - if @code{BZ_OK} was returned - @code{BZ2_bzDecompressEnd} - otherwise -@end display - - -@subsection @code{BZ2_bzDecompressEnd} -@example -int BZ2_bzDecompressEnd ( bz_stream *strm ); -@end example -Releases all memory associated with a decompression stream. - -Possible return values: -@display - @code{BZ_PARAM_ERROR} - if @code{strm} is @code{NULL} or @code{strm->s} is @code{NULL} - @code{BZ_OK} - otherwise -@end display - -Allowable next actions: -@display - None. -@end display - - -@section High-level interface - -This interface provides functions for reading and writing -@code{bzip2} format files. First, some general points. - -@itemize @bullet -@item All of the functions take an @code{int*} first argument, - @code{bzerror}. - After each call, @code{bzerror} should be consulted first to determine - the outcome of the call. If @code{bzerror} is @code{BZ_OK}, - the call completed - successfully, and only then should the return value of the function - (if any) be consulted. If @code{bzerror} is @code{BZ_IO_ERROR}, - there was an error - reading/writing the underlying compressed file, and you should - then consult @code{errno}/@code{perror} to determine the - cause of the difficulty. - @code{bzerror} may also be set to various other values; precise details are - given on a per-function basis below. -@item If @code{bzerror} indicates an error - (ie, anything except @code{BZ_OK} and @code{BZ_STREAM_END}), - you should immediately call @code{BZ2_bzReadClose} (or @code{BZ2_bzWriteClose}, - depending on whether you are attempting to read or to write) - to free up all resources associated - with the stream. Once an error has been indicated, behaviour of all calls - except @code{BZ2_bzReadClose} (@code{BZ2_bzWriteClose}) is undefined. - The implication is that (1) @code{bzerror} should - be checked after each call, and (2) if @code{bzerror} indicates an error, - @code{BZ2_bzReadClose} (@code{BZ2_bzWriteClose}) should then be called to clean up. -@item The @code{FILE*} arguments passed to - @code{BZ2_bzReadOpen}/@code{BZ2_bzWriteOpen} - should be set to binary mode. - Most Unix systems will do this by default, but other platforms, - including Windows and Mac, will not. If you omit this, you may - encounter problems when moving code to new platforms. -@item Memory allocation requests are handled by - @code{malloc}/@code{free}. - At present - there is no facility for user-defined memory allocators in the file I/O - functions (could easily be added, though). -@end itemize - - - -@subsection @code{BZ2_bzReadOpen} -@example - typedef void BZFILE; - - BZFILE *BZ2_bzReadOpen ( int *bzerror, FILE *f, - int small, int verbosity, - void *unused, int nUnused ); -@end example -Prepare to read compressed data from file handle @code{f}. @code{f} -should refer to a file which has been opened for reading, and for which -the error indicator (@code{ferror(f)})is not set. If @code{small} is 1, -the library will try to decompress using less memory, at the expense of -speed. - -For reasons explained below, @code{BZ2_bzRead} will decompress the -@code{nUnused} bytes starting at @code{unused}, before starting to read -from the file @code{f}. At most @code{BZ_MAX_UNUSED} bytes may be -supplied like this. If this facility is not required, you should pass -@code{NULL} and @code{0} for @code{unused} and n@code{Unused} -respectively. - -For the meaning of parameters @code{small} and @code{verbosity}, -see @code{BZ2_bzDecompressInit}. - -The amount of memory needed to decompress a file cannot be determined -until the file's header has been read. So it is possible that -@code{BZ2_bzReadOpen} returns @code{BZ_OK} but a subsequent call of -@code{BZ2_bzRead} will return @code{BZ_MEM_ERROR}. - -Possible assignments to @code{bzerror}: -@display - @code{BZ_CONFIG_ERROR} - if the library has been mis-compiled - @code{BZ_PARAM_ERROR} - if @code{f} is @code{NULL} - or @code{small} is neither @code{0} nor @code{1} - or @code{(unused == NULL && nUnused != 0)} - or @code{(unused != NULL && !(0 <= nUnused <= BZ_MAX_UNUSED))} - @code{BZ_IO_ERROR} - if @code{ferror(f)} is nonzero - @code{BZ_MEM_ERROR} - if insufficient memory is available - @code{BZ_OK} - otherwise. -@end display - -Possible return values: -@display - Pointer to an abstract @code{BZFILE} - if @code{bzerror} is @code{BZ_OK} - @code{NULL} - otherwise -@end display - -Allowable next actions: -@display - @code{BZ2_bzRead} - if @code{bzerror} is @code{BZ_OK} - @code{BZ2_bzClose} - otherwise -@end display - - -@subsection @code{BZ2_bzRead} -@example - int BZ2_bzRead ( int *bzerror, BZFILE *b, void *buf, int len ); -@end example -Reads up to @code{len} (uncompressed) bytes from the compressed file -@code{b} into -the buffer @code{buf}. If the read was successful, -@code{bzerror} is set to @code{BZ_OK} -and the number of bytes read is returned. If the logical end-of-stream -was detected, @code{bzerror} will be set to @code{BZ_STREAM_END}, -and the number -of bytes read is returned. All other @code{bzerror} values denote an error. - -@code{BZ2_bzRead} will supply @code{len} bytes, -unless the logical stream end is detected -or an error occurs. Because of this, it is possible to detect the -stream end by observing when the number of bytes returned is -less than the number -requested. Nevertheless, this is regarded as inadvisable; you should -instead check @code{bzerror} after every call and watch out for -@code{BZ_STREAM_END}. - -Internally, @code{BZ2_bzRead} copies data from the compressed file in chunks -of size @code{BZ_MAX_UNUSED} bytes -before decompressing it. If the file contains more bytes than strictly -needed to reach the logical end-of-stream, @code{BZ2_bzRead} will almost certainly -read some of the trailing data before signalling @code{BZ_SEQUENCE_END}. -To collect the read but unused data once @code{BZ_SEQUENCE_END} has -appeared, call @code{BZ2_bzReadGetUnused} immediately before @code{BZ2_bzReadClose}. - -Possible assignments to @code{bzerror}: -@display - @code{BZ_PARAM_ERROR} - if @code{b} is @code{NULL} or @code{buf} is @code{NULL} or @code{len < 0} - @code{BZ_SEQUENCE_ERROR} - if @code{b} was opened with @code{BZ2_bzWriteOpen} - @code{BZ_IO_ERROR} - if there is an error reading from the compressed file - @code{BZ_UNEXPECTED_EOF} - if the compressed file ended before the logical end-of-stream was detected - @code{BZ_DATA_ERROR} - if a data integrity error was detected in the compressed stream - @code{BZ_DATA_ERROR_MAGIC} - if the stream does not begin with the requisite header bytes (ie, is not - a @code{bzip2} data file). This is really a special case of @code{BZ_DATA_ERROR}. - @code{BZ_MEM_ERROR} - if insufficient memory was available - @code{BZ_STREAM_END} - if the logical end of stream was detected. - @code{BZ_OK} - otherwise. -@end display - -Possible return values: -@display - number of bytes read - if @code{bzerror} is @code{BZ_OK} or @code{BZ_STREAM_END} - undefined - otherwise -@end display - -Allowable next actions: -@display - collect data from @code{buf}, then @code{BZ2_bzRead} or @code{BZ2_bzReadClose} - if @code{bzerror} is @code{BZ_OK} - collect data from @code{buf}, then @code{BZ2_bzReadClose} or @code{BZ2_bzReadGetUnused} - if @code{bzerror} is @code{BZ_SEQUENCE_END} - @code{BZ2_bzReadClose} - otherwise -@end display - - - -@subsection @code{BZ2_bzReadGetUnused} -@example - void BZ2_bzReadGetUnused ( int* bzerror, BZFILE *b, - void** unused, int* nUnused ); -@end example -Returns data which was read from the compressed file but was not needed -to get to the logical end-of-stream. @code{*unused} is set to the address -of the data, and @code{*nUnused} to the number of bytes. @code{*nUnused} will -be set to a value between @code{0} and @code{BZ_MAX_UNUSED} inclusive. - -This function may only be called once @code{BZ2_bzRead} has signalled -@code{BZ_STREAM_END} but before @code{BZ2_bzReadClose}. - -Possible assignments to @code{bzerror}: -@display - @code{BZ_PARAM_ERROR} - if @code{b} is @code{NULL} - or @code{unused} is @code{NULL} or @code{nUnused} is @code{NULL} - @code{BZ_SEQUENCE_ERROR} - if @code{BZ_STREAM_END} has not been signalled - or if @code{b} was opened with @code{BZ2_bzWriteOpen} - @code{BZ_OK} - otherwise -@end display - -Allowable next actions: -@display - @code{BZ2_bzReadClose} -@end display - - -@subsection @code{BZ2_bzReadClose} -@example - void BZ2_bzReadClose ( int *bzerror, BZFILE *b ); -@end example -Releases all memory pertaining to the compressed file @code{b}. -@code{BZ2_bzReadClose} does not call @code{fclose} on the underlying file -handle, so you should do that yourself if appropriate. -@code{BZ2_bzReadClose} should be called to clean up after all error -situations. - -Possible assignments to @code{bzerror}: -@display - @code{BZ_SEQUENCE_ERROR} - if @code{b} was opened with @code{BZ2_bzOpenWrite} - @code{BZ_OK} - otherwise -@end display - -Allowable next actions: -@display - none -@end display - - - -@subsection @code{BZ2_bzWriteOpen} -@example - BZFILE *BZ2_bzWriteOpen ( int *bzerror, FILE *f, - int blockSize100k, int verbosity, - int workFactor ); -@end example -Prepare to write compressed data to file handle @code{f}. -@code{f} should refer to -a file which has been opened for writing, and for which the error -indicator (@code{ferror(f)})is not set. - -For the meaning of parameters @code{blockSize100k}, -@code{verbosity} and @code{workFactor}, see -@* @code{BZ2_bzCompressInit}. - -All required memory is allocated at this stage, so if the call -completes successfully, @code{BZ_MEM_ERROR} cannot be signalled by a -subsequent call to @code{BZ2_bzWrite}. - -Possible assignments to @code{bzerror}: -@display - @code{BZ_CONFIG_ERROR} - if the library has been mis-compiled - @code{BZ_PARAM_ERROR} - if @code{f} is @code{NULL} - or @code{blockSize100k < 1} or @code{blockSize100k > 9} - @code{BZ_IO_ERROR} - if @code{ferror(f)} is nonzero - @code{BZ_MEM_ERROR} - if insufficient memory is available - @code{BZ_OK} - otherwise -@end display - -Possible return values: -@display - Pointer to an abstract @code{BZFILE} - if @code{bzerror} is @code{BZ_OK} - @code{NULL} - otherwise -@end display - -Allowable next actions: -@display - @code{BZ2_bzWrite} - if @code{bzerror} is @code{BZ_OK} - (you could go directly to @code{BZ2_bzWriteClose}, but this would be pretty pointless) - @code{BZ2_bzWriteClose} - otherwise -@end display - - - -@subsection @code{BZ2_bzWrite} -@example - void BZ2_bzWrite ( int *bzerror, BZFILE *b, void *buf, int len ); -@end example -Absorbs @code{len} bytes from the buffer @code{buf}, eventually to be -compressed and written to the file. - -Possible assignments to @code{bzerror}: -@display - @code{BZ_PARAM_ERROR} - if @code{b} is @code{NULL} or @code{buf} is @code{NULL} or @code{len < 0} - @code{BZ_SEQUENCE_ERROR} - if b was opened with @code{BZ2_bzReadOpen} - @code{BZ_IO_ERROR} - if there is an error writing the compressed file. - @code{BZ_OK} - otherwise -@end display - - - - -@subsection @code{BZ2_bzWriteClose} -@example - void BZ2_bzWriteClose ( int *bzerror, BZFILE* f, - int abandon, - unsigned int* nbytes_in, - unsigned int* nbytes_out ); - - void BZ2_bzWriteClose64 ( int *bzerror, BZFILE* f, - int abandon, - unsigned int* nbytes_in_lo32, - unsigned int* nbytes_in_hi32, - unsigned int* nbytes_out_lo32, - unsigned int* nbytes_out_hi32 ); -@end example - -Compresses and flushes to the compressed file all data so far supplied -by @code{BZ2_bzWrite}. The logical end-of-stream markers are also written, so -subsequent calls to @code{BZ2_bzWrite} are illegal. All memory associated -with the compressed file @code{b} is released. -@code{fflush} is called on the -compressed file, but it is not @code{fclose}'d. - -If @code{BZ2_bzWriteClose} is called to clean up after an error, the only -action is to release the memory. The library records the error codes -issued by previous calls, so this situation will be detected -automatically. There is no attempt to complete the compression -operation, nor to @code{fflush} the compressed file. You can force this -behaviour to happen even in the case of no error, by passing a nonzero -value to @code{abandon}. - -If @code{nbytes_in} is non-null, @code{*nbytes_in} will be set to be the -total volume of uncompressed data handled. Similarly, @code{nbytes_out} -will be set to the total volume of compressed data written. For -compatibility with older versions of the library, @code{BZ2_bzWriteClose} -only yields the lower 32 bits of these counts. Use -@code{BZ2_bzWriteClose64} if you want the full 64 bit counts. These -two functions are otherwise absolutely identical. - - -Possible assignments to @code{bzerror}: -@display - @code{BZ_SEQUENCE_ERROR} - if @code{b} was opened with @code{BZ2_bzReadOpen} - @code{BZ_IO_ERROR} - if there is an error writing the compressed file - @code{BZ_OK} - otherwise -@end display - -@subsection Handling embedded compressed data streams - -The high-level library facilitates use of -@code{bzip2} data streams which form some part of a surrounding, larger -data stream. -@itemize @bullet -@item For writing, the library takes an open file handle, writes -compressed data to it, @code{fflush}es it but does not @code{fclose} it. -The calling application can write its own data before and after the -compressed data stream, using that same file handle. -@item Reading is more complex, and the facilities are not as general -as they could be since generality is hard to reconcile with efficiency. -@code{BZ2_bzRead} reads from the compressed file in blocks of size -@code{BZ_MAX_UNUSED} bytes, and in doing so probably will overshoot -the logical end of compressed stream. -To recover this data once decompression has -ended, call @code{BZ2_bzReadGetUnused} after the last call of @code{BZ2_bzRead} -(the one returning @code{BZ_STREAM_END}) but before calling -@code{BZ2_bzReadClose}. -@end itemize - -This mechanism makes it easy to decompress multiple @code{bzip2} -streams placed end-to-end. As the end of one stream, when @code{BZ2_bzRead} -returns @code{BZ_STREAM_END}, call @code{BZ2_bzReadGetUnused} to collect the -unused data (copy it into your own buffer somewhere). -That data forms the start of the next compressed stream. -To start uncompressing that next stream, call @code{BZ2_bzReadOpen} again, -feeding in the unused data via the @code{unused}/@code{nUnused} -parameters. -Keep doing this until @code{BZ_STREAM_END} return coincides with the -physical end of file (@code{feof(f)}). In this situation -@code{BZ2_bzReadGetUnused} -will of course return no data. - -This should give some feel for how the high-level interface can be used. -If you require extra flexibility, you'll have to bite the bullet and get -to grips with the low-level interface. - -@subsection Standard file-reading/writing code -Here's how you'd write data to a compressed file: -@example @code -FILE* f; -BZFILE* b; -int nBuf; -char buf[ /* whatever size you like */ ]; -int bzerror; -int nWritten; - -f = fopen ( "myfile.bz2", "w" ); -if (!f) @{ - /* handle error */ -@} -b = BZ2_bzWriteOpen ( &bzerror, f, 9 ); -if (bzerror != BZ_OK) @{ - BZ2_bzWriteClose ( b ); - /* handle error */ -@} - -while ( /* condition */ ) @{ - /* get data to write into buf, and set nBuf appropriately */ - nWritten = BZ2_bzWrite ( &bzerror, b, buf, nBuf ); - if (bzerror == BZ_IO_ERROR) @{ - BZ2_bzWriteClose ( &bzerror, b ); - /* handle error */ - @} -@} - -BZ2_bzWriteClose ( &bzerror, b ); -if (bzerror == BZ_IO_ERROR) @{ - /* handle error */ -@} -@end example -And to read from a compressed file: -@example -FILE* f; -BZFILE* b; -int nBuf; -char buf[ /* whatever size you like */ ]; -int bzerror; -int nWritten; - -f = fopen ( "myfile.bz2", "r" ); -if (!f) @{ - /* handle error */ -@} -b = BZ2_bzReadOpen ( &bzerror, f, 0, NULL, 0 ); -if (bzerror != BZ_OK) @{ - BZ2_bzReadClose ( &bzerror, b ); - /* handle error */ -@} - -bzerror = BZ_OK; -while (bzerror == BZ_OK && /* arbitrary other conditions */) @{ - nBuf = BZ2_bzRead ( &bzerror, b, buf, /* size of buf */ ); - if (bzerror == BZ_OK) @{ - /* do something with buf[0 .. nBuf-1] */ - @} -@} -if (bzerror != BZ_STREAM_END) @{ - BZ2_bzReadClose ( &bzerror, b ); - /* handle error */ -@} else @{ - BZ2_bzReadClose ( &bzerror ); -@} -@end example - - - -@section Utility functions -@subsection @code{BZ2_bzBuffToBuffCompress} -@example - int BZ2_bzBuffToBuffCompress( char* dest, - unsigned int* destLen, - char* source, - unsigned int sourceLen, - int blockSize100k, - int verbosity, - int workFactor ); -@end example -Attempts to compress the data in @code{source[0 .. sourceLen-1]} -into the destination buffer, @code{dest[0 .. *destLen-1]}. -If the destination buffer is big enough, @code{*destLen} is -set to the size of the compressed data, and @code{BZ_OK} is -returned. If the compressed data won't fit, @code{*destLen} -is unchanged, and @code{BZ_OUTBUFF_FULL} is returned. - -Compression in this manner is a one-shot event, done with a single call -to this function. The resulting compressed data is a complete -@code{bzip2} format data stream. There is no mechanism for making -additional calls to provide extra input data. If you want that kind of -mechanism, use the low-level interface. - -For the meaning of parameters @code{blockSize100k}, @code{verbosity} -and @code{workFactor}, @* see @code{BZ2_bzCompressInit}. - -To guarantee that the compressed data will fit in its buffer, allocate -an output buffer of size 1% larger than the uncompressed data, plus -six hundred extra bytes. - -@code{BZ2_bzBuffToBuffDecompress} will not write data at or -beyond @code{dest[*destLen]}, even in case of buffer overflow. - -Possible return values: -@display - @code{BZ_CONFIG_ERROR} - if the library has been mis-compiled - @code{BZ_PARAM_ERROR} - if @code{dest} is @code{NULL} or @code{destLen} is @code{NULL} - or @code{blockSize100k < 1} or @code{blockSize100k > 9} - or @code{verbosity < 0} or @code{verbosity > 4} - or @code{workFactor < 0} or @code{workFactor > 250} - @code{BZ_MEM_ERROR} - if insufficient memory is available - @code{BZ_OUTBUFF_FULL} - if the size of the compressed data exceeds @code{*destLen} - @code{BZ_OK} - otherwise -@end display - - - -@subsection @code{BZ2_bzBuffToBuffDecompress} -@example - int BZ2_bzBuffToBuffDecompress ( char* dest, - unsigned int* destLen, - char* source, - unsigned int sourceLen, - int small, - int verbosity ); -@end example -Attempts to decompress the data in @code{source[0 .. sourceLen-1]} -into the destination buffer, @code{dest[0 .. *destLen-1]}. -If the destination buffer is big enough, @code{*destLen} is -set to the size of the uncompressed data, and @code{BZ_OK} is -returned. If the compressed data won't fit, @code{*destLen} -is unchanged, and @code{BZ_OUTBUFF_FULL} is returned. - -@code{source} is assumed to hold a complete @code{bzip2} format -data stream. @* @code{BZ2_bzBuffToBuffDecompress} tries to decompress -the entirety of the stream into the output buffer. - -For the meaning of parameters @code{small} and @code{verbosity}, -see @code{BZ2_bzDecompressInit}. - -Because the compression ratio of the compressed data cannot be known in -advance, there is no easy way to guarantee that the output buffer will -be big enough. You may of course make arrangements in your code to -record the size of the uncompressed data, but such a mechanism is beyond -the scope of this library. - -@code{BZ2_bzBuffToBuffDecompress} will not write data at or -beyond @code{dest[*destLen]}, even in case of buffer overflow. - -Possible return values: -@display - @code{BZ_CONFIG_ERROR} - if the library has been mis-compiled - @code{BZ_PARAM_ERROR} - if @code{dest} is @code{NULL} or @code{destLen} is @code{NULL} - or @code{small != 0 && small != 1} - or @code{verbosity < 0} or @code{verbosity > 4} - @code{BZ_MEM_ERROR} - if insufficient memory is available - @code{BZ_OUTBUFF_FULL} - if the size of the compressed data exceeds @code{*destLen} - @code{BZ_DATA_ERROR} - if a data integrity error was detected in the compressed data - @code{BZ_DATA_ERROR_MAGIC} - if the compressed data doesn't begin with the right magic bytes - @code{BZ_UNEXPECTED_EOF} - if the compressed data ends unexpectedly - @code{BZ_OK} - otherwise -@end display - - - -@section @code{zlib} compatibility functions -Yoshioka Tsuneo has contributed some functions to -give better @code{zlib} compatibility. These functions are -@code{BZ2_bzopen}, @code{BZ2_bzread}, @code{BZ2_bzwrite}, @code{BZ2_bzflush}, -@code{BZ2_bzclose}, -@code{BZ2_bzerror} and @code{BZ2_bzlibVersion}. -These functions are not (yet) officially part of -the library. If they break, you get to keep all the pieces. -Nevertheless, I think they work ok. -@example -typedef void BZFILE; - -const char * BZ2_bzlibVersion ( void ); -@end example -Returns a string indicating the library version. -@example -BZFILE * BZ2_bzopen ( const char *path, const char *mode ); -BZFILE * BZ2_bzdopen ( int fd, const char *mode ); -@end example -Opens a @code{.bz2} file for reading or writing, using either its name -or a pre-existing file descriptor. -Analogous to @code{fopen} and @code{fdopen}. -@example -int BZ2_bzread ( BZFILE* b, void* buf, int len ); -int BZ2_bzwrite ( BZFILE* b, void* buf, int len ); -@end example -Reads/writes data from/to a previously opened @code{BZFILE}. -Analogous to @code{fread} and @code{fwrite}. -@example -int BZ2_bzflush ( BZFILE* b ); -void BZ2_bzclose ( BZFILE* b ); -@end example -Flushes/closes a @code{BZFILE}. @code{BZ2_bzflush} doesn't actually do -anything. Analogous to @code{fflush} and @code{fclose}. - -@example -const char * BZ2_bzerror ( BZFILE *b, int *errnum ) -@end example -Returns a string describing the more recent error status of -@code{b}, and also sets @code{*errnum} to its numerical value. - - -@section Using the library in a @code{stdio}-free environment - -@subsection Getting rid of @code{stdio} - -In a deeply embedded application, you might want to use just -the memory-to-memory functions. You can do this conveniently -by compiling the library with preprocessor symbol @code{BZ_NO_STDIO} -defined. Doing this gives you a library containing only the following -eight functions: - -@code{BZ2_bzCompressInit}, @code{BZ2_bzCompress}, @code{BZ2_bzCompressEnd} @* -@code{BZ2_bzDecompressInit}, @code{BZ2_bzDecompress}, @code{BZ2_bzDecompressEnd} @* -@code{BZ2_bzBuffToBuffCompress}, @code{BZ2_bzBuffToBuffDecompress} - -When compiled like this, all functions will ignore @code{verbosity} -settings. - -@subsection Critical error handling -@code{libbzip2} contains a number of internal assertion checks which -should, needless to say, never be activated. Nevertheless, if an -assertion should fail, behaviour depends on whether or not the library -was compiled with @code{BZ_NO_STDIO} set. - -For a normal compile, an assertion failure yields the message -@example - bzip2/libbzip2: internal error number N. - This is a bug in bzip2/libbzip2, 1.0 of 21-Mar-2000. - Please report it to me at: jseward@@acm.org. If this happened - when you were using some program which uses libbzip2 as a - component, you should also report this bug to the author(s) - of that program. Please make an effort to report this bug; - timely and accurate bug reports eventually lead to higher - quality software. Thanks. Julian Seward, 21 March 2000. -@end example -where @code{N} is some error code number. @code{exit(3)} -is then called. - -For a @code{stdio}-free library, assertion failures result -in a call to a function declared as: -@example - extern void bz_internal_error ( int errcode ); -@end example -The relevant code is passed as a parameter. You should supply -such a function. - -In either case, once an assertion failure has occurred, any -@code{bz_stream} records involved can be regarded as invalid. -You should not attempt to resume normal operation with them. - -You may, of course, change critical error handling to suit -your needs. As I said above, critical errors indicate bugs -in the library and should not occur. All "normal" error -situations are indicated via error return codes from functions, -and can be recovered from. - - -@section Making a Windows DLL -Everything related to Windows has been contributed by Yoshioka Tsuneo -@* (@code{QWF00133@@niftyserve.or.jp} / -@code{tsuneo-y@@is.aist-nara.ac.jp}), so you should send your queries to -him (but perhaps Cc: me, @code{jseward@@acm.org}). - -My vague understanding of what to do is: using Visual C++ 5.0, -open the project file @code{libbz2.dsp}, and build. That's all. - -If you can't -open the project file for some reason, make a new one, naming these files: -@code{blocksort.c}, @code{bzlib.c}, @code{compress.c}, -@code{crctable.c}, @code{decompress.c}, @code{huffman.c}, @* -@code{randtable.c} and @code{libbz2.def}. You will also need -to name the header files @code{bzlib.h} and @code{bzlib_private.h}. - -If you don't use VC++, you may need to define the proprocessor symbol -@code{_WIN32}. - -Finally, @code{dlltest.c} is a sample program using the DLL. It has a -project file, @code{dlltest.dsp}. - -If you just want a makefile for Visual C, have a look at -@code{makefile.msc}. - -Be aware that if you compile @code{bzip2} itself on Win32, you must set -@code{BZ_UNIX} to 0 and @code{BZ_LCCWIN32} to 1, in the file -@code{bzip2.c}, before compiling. Otherwise the resulting binary won't -work correctly. - -I haven't tried any of this stuff myself, but it all looks plausible. - - - -@chapter Miscellanea - -These are just some random thoughts of mine. Your mileage may -vary. - -@section Limitations of the compressed file format -@code{bzip2-1.0}, @code{0.9.5} and @code{0.9.0} -use exactly the same file format as the previous -version, @code{bzip2-0.1}. This decision was made in the interests of -stability. Creating yet another incompatible compressed file format -would create further confusion and disruption for users. - -Nevertheless, this is not a painless decision. Development -work since the release of @code{bzip2-0.1} in August 1997 -has shown complexities in the file format which slow down -decompression and, in retrospect, are unnecessary. These are: -@itemize @bullet -@item The run-length encoder, which is the first of the - compression transformations, is entirely irrelevant. - The original purpose was to protect the sorting algorithm - from the very worst case input: a string of repeated - symbols. But algorithm steps Q6a and Q6b in the original - Burrows-Wheeler technical report (SRC-124) show how - repeats can be handled without difficulty in block - sorting. -@item The randomisation mechanism doesn't really need to be - there. Udi Manber and Gene Myers published a suffix - array construction algorithm a few years back, which - can be employed to sort any block, no matter how - repetitive, in O(N log N) time. Subsequent work by - Kunihiko Sadakane has produced a derivative O(N (log N)^2) - algorithm which usually outperforms the Manber-Myers - algorithm. - - I could have changed to Sadakane's algorithm, but I find - it to be slower than @code{bzip2}'s existing algorithm for - most inputs, and the randomisation mechanism protects - adequately against bad cases. I didn't think it was - a good tradeoff to make. Partly this is due to the fact - that I was not flooded with email complaints about - @code{bzip2-0.1}'s performance on repetitive data, so - perhaps it isn't a problem for real inputs. - - Probably the best long-term solution, - and the one I have incorporated into 0.9.5 and above, - is to use the existing sorting - algorithm initially, and fall back to a O(N (log N)^2) - algorithm if the standard algorithm gets into difficulties. -@item The compressed file format was never designed to be - handled by a library, and I have had to jump though - some hoops to produce an efficient implementation of - decompression. It's a bit hairy. Try passing - @code{decompress.c} through the C preprocessor - and you'll see what I mean. Much of this complexity - could have been avoided if the compressed size of - each block of data was recorded in the data stream. -@item An Adler-32 checksum, rather than a CRC32 checksum, - would be faster to compute. -@end itemize -It would be fair to say that the @code{bzip2} format was frozen -before I properly and fully understood the performance -consequences of doing so. - -Improvements which I was able to incorporate into -0.9.0, despite using the same file format, are: -@itemize @bullet -@item Single array implementation of the inverse BWT. This - significantly speeds up decompression, presumably - because it reduces the number of cache misses. -@item Faster inverse MTF transform for large MTF values. The - new implementation is based on the notion of sliding blocks - of values. -@item @code{bzip2-0.9.0} now reads and writes files with @code{fread} - and @code{fwrite}; version 0.1 used @code{putc} and @code{getc}. - Duh! Well, you live and learn. - -@end itemize -Further ahead, it would be nice -to be able to do random access into files. This will -require some careful design of compressed file formats. - - - -@section Portability issues -After some consideration, I have decided not to use -GNU @code{autoconf} to configure 0.9.5 or 1.0. - -@code{autoconf}, admirable and wonderful though it is, -mainly assists with portability problems between Unix-like -platforms. But @code{bzip2} doesn't have much in the way -of portability problems on Unix; most of the difficulties appear -when porting to the Mac, or to Microsoft's operating systems. -@code{autoconf} doesn't help in those cases, and brings in a -whole load of new complexity. - -Most people should be able to compile the library and program -under Unix straight out-of-the-box, so to speak, especially -if you have a version of GNU C available. - -There are a couple of @code{__inline__} directives in the code. GNU C -(@code{gcc}) should be able to handle them. If you're not using -GNU C, your C compiler shouldn't see them at all. -If your compiler does, for some reason, see them and doesn't -like them, just @code{#define} @code{__inline__} to be @code{/* */}. One -easy way to do this is to compile with the flag @code{-D__inline__=}, -which should be understood by most Unix compilers. - -If you still have difficulties, try compiling with the macro -@code{BZ_STRICT_ANSI} defined. This should enable you to build the -library in a strictly ANSI compliant environment. Building the program -itself like this is dangerous and not supported, since you remove -@code{bzip2}'s checks against compressing directories, symbolic links, -devices, and other not-really-a-file entities. This could cause -filesystem corruption! - -One other thing: if you create a @code{bzip2} binary for public -distribution, please try and link it statically (@code{gcc -s}). This -avoids all sorts of library-version issues that others may encounter -later on. - -If you build @code{bzip2} on Win32, you must set @code{BZ_UNIX} to 0 and -@code{BZ_LCCWIN32} to 1, in the file @code{bzip2.c}, before compiling. -Otherwise the resulting binary won't work correctly. - - - -@section Reporting bugs -I tried pretty hard to make sure @code{bzip2} is -bug free, both by design and by testing. Hopefully -you'll never need to read this section for real. - -Nevertheless, if @code{bzip2} dies with a segmentation -fault, a bus error or an internal assertion failure, it -will ask you to email me a bug report. Experience with -version 0.1 shows that almost all these problems can -be traced to either compiler bugs or hardware problems. -@itemize @bullet -@item -Recompile the program with no optimisation, and see if it -works. And/or try a different compiler. -I heard all sorts of stories about various flavours -of GNU C (and other compilers) generating bad code for -@code{bzip2}, and I've run across two such examples myself. - -2.7.X versions of GNU C are known to generate bad code from -time to time, at high optimisation levels. -If you get problems, try using the flags -@code{-O2} @code{-fomit-frame-pointer} @code{-fno-strength-reduce}. -You should specifically @emph{not} use @code{-funroll-loops}. - -You may notice that the Makefile runs six tests as part of -the build process. If the program passes all of these, it's -a pretty good (but not 100%) indication that the compiler has -done its job correctly. -@item -If @code{bzip2} crashes randomly, and the crashes are not -repeatable, you may have a flaky memory subsystem. @code{bzip2} -really hammers your memory hierarchy, and if it's a bit marginal, -you may get these problems. Ditto if your disk or I/O subsystem -is slowly failing. Yup, this really does happen. - -Try using a different machine of the same type, and see if -you can repeat the problem. -@item This isn't really a bug, but ... If @code{bzip2} tells -you your file is corrupted on decompression, and you -obtained the file via FTP, there is a possibility that you -forgot to tell FTP to do a binary mode transfer. That absolutely -will cause the file to be non-decompressible. You'll have to transfer -it again. -@end itemize - -If you've incorporated @code{libbzip2} into your own program -and are getting problems, please, please, please, check that the -parameters you are passing in calls to the library, are -correct, and in accordance with what the documentation says -is allowable. I have tried to make the library robust against -such problems, but I'm sure I haven't succeeded. - -Finally, if the above comments don't help, you'll have to send -me a bug report. Now, it's just amazing how many people will -send me a bug report saying something like -@display - bzip2 crashed with segmentation fault on my machine -@end display -and absolutely nothing else. Needless to say, a such a report -is @emph{totally, utterly, completely and comprehensively 100% useless; -a waste of your time, my time, and net bandwidth}. -With no details at all, there's no way I can possibly begin -to figure out what the problem is. - -The rules of the game are: facts, facts, facts. Don't omit -them because "oh, they won't be relevant". At the bare -minimum: -@display - Machine type. Operating system version. - Exact version of @code{bzip2} (do @code{bzip2 -V}). - Exact version of the compiler used. - Flags passed to the compiler. -@end display -However, the most important single thing that will help me is -the file that you were trying to compress or decompress at the -time the problem happened. Without that, my ability to do anything -more than speculate about the cause, is limited. - -Please remember that I connect to the Internet with a modem, so -you should contact me before mailing me huge files. - - -@section Did you get the right package? - -@code{bzip2} is a resource hog. It soaks up large amounts of CPU cycles -and memory. Also, it gives very large latencies. In the worst case, you -can feed many megabytes of uncompressed data into the library before -getting any compressed output, so this probably rules out applications -requiring interactive behaviour. - -These aren't faults of my implementation, I hope, but more -an intrinsic property of the Burrows-Wheeler transform (unfortunately). -Maybe this isn't what you want. - -If you want a compressor and/or library which is faster, uses less -memory but gets pretty good compression, and has minimal latency, -consider Jean-loup -Gailly's and Mark Adler's work, @code{zlib-1.1.2} and -@code{gzip-1.2.4}. Look for them at - -@code{http://www.cdrom.com/pub/infozip/zlib} and -@code{http://www.gzip.org} respectively. - -For something faster and lighter still, you might try Markus F X J -Oberhumer's @code{LZO} real-time compression/decompression library, at -@* @code{http://wildsau.idv.uni-linz.ac.at/mfx/lzo.html}. - -If you want to use the @code{bzip2} algorithms to compress small blocks -of data, 64k bytes or smaller, for example on an on-the-fly disk -compressor, you'd be well advised not to use this library. Instead, -I've made a special library tuned for that kind of use. It's part of -@code{e2compr-0.40}, an on-the-fly disk compressor for the Linux -@code{ext2} filesystem. Look at -@code{http://www.netspace.net.au/~reiter/e2compr}. - - - -@section Testing - -A record of the tests I've done. - -First, some data sets: -@itemize @bullet -@item B: a directory containing 6001 files, one for every length in the - range 0 to 6000 bytes. The files contain random lowercase - letters. 18.7 megabytes. -@item H: my home directory tree. Documents, source code, mail files, - compressed data. H contains B, and also a directory of - files designed as boundary cases for the sorting; mostly very - repetitive, nasty files. 565 megabytes. -@item A: directory tree holding various applications built from source: - @code{egcs}, @code{gcc-2.8.1}, KDE, GTK, Octave, etc. - 2200 megabytes. -@end itemize -The tests conducted are as follows. Each test means compressing -(a copy of) each file in the data set, decompressing it and -comparing it against the original. - -First, a bunch of tests with block sizes and internal buffer -sizes set very small, -to detect any problems with the -blocking and buffering mechanisms. -This required modifying the source code so as to try to -break it. -@enumerate -@item Data set H, with - buffer size of 1 byte, and block size of 23 bytes. -@item Data set B, buffer sizes 1 byte, block size 1 byte. -@item As (2) but small-mode decompression. -@item As (2) with block size 2 bytes. -@item As (2) with block size 3 bytes. -@item As (2) with block size 4 bytes. -@item As (2) with block size 5 bytes. -@item As (2) with block size 6 bytes and small-mode decompression. -@item H with buffer size of 1 byte, but normal block - size (up to 900000 bytes). -@end enumerate -Then some tests with unmodified source code. -@enumerate -@item H, all settings normal. -@item As (1), with small-mode decompress. -@item H, compress with flag @code{-1}. -@item H, compress with flag @code{-s}, decompress with flag @code{-s}. -@item Forwards compatibility: H, @code{bzip2-0.1pl2} compressing, - @code{bzip2-0.9.5} decompressing, all settings normal. -@item Backwards compatibility: H, @code{bzip2-0.9.5} compressing, - @code{bzip2-0.1pl2} decompressing, all settings normal. -@item Bigger tests: A, all settings normal. -@item As (7), using the fallback (Sadakane-like) sorting algorithm. -@item As (8), compress with flag @code{-1}, decompress with flag - @code{-s}. -@item H, using the fallback sorting algorithm. -@item Forwards compatibility: A, @code{bzip2-0.1pl2} compressing, - @code{bzip2-0.9.5} decompressing, all settings normal. -@item Backwards compatibility: A, @code{bzip2-0.9.5} compressing, - @code{bzip2-0.1pl2} decompressing, all settings normal. -@item Misc test: about 400 megabytes of @code{.tar} files with - @code{bzip2} compiled with Checker (a memory access error - detector, like Purify). -@item Misc tests to make sure it builds and runs ok on non-Linux/x86 - platforms. -@end enumerate -These tests were conducted on a 225 MHz IDT WinChip machine, running -Linux 2.0.36. They represent nearly a week of continuous computation. -All tests completed successfully. - - -@section Further reading -@code{bzip2} is not research work, in the sense that it doesn't present -any new ideas. Rather, it's an engineering exercise based on existing -ideas. - -Four documents describe essentially all the ideas behind @code{bzip2}: -@example -Michael Burrows and D. J. Wheeler: - "A block-sorting lossless data compression algorithm" - 10th May 1994. - Digital SRC Research Report 124. - ftp://ftp.digital.com/pub/DEC/SRC/research-reports/SRC-124.ps.gz - If you have trouble finding it, try searching at the - New Zealand Digital Library, http://www.nzdl.org. - -Daniel S. Hirschberg and Debra A. LeLewer - "Efficient Decoding of Prefix Codes" - Communications of the ACM, April 1990, Vol 33, Number 4. - You might be able to get an electronic copy of this - from the ACM Digital Library. - -David J. Wheeler - Program bred3.c and accompanying document bred3.ps. - This contains the idea behind the multi-table Huffman - coding scheme. - ftp://ftp.cl.cam.ac.uk/users/djw3/ - -Jon L. Bentley and Robert Sedgewick - "Fast Algorithms for Sorting and Searching Strings" - Available from Sedgewick's web page, - www.cs.princeton.edu/~rs -@end example -The following paper gives valuable additional insights into the -algorithm, but is not immediately the basis of any code -used in bzip2. -@example -Peter Fenwick: - Block Sorting Text Compression - Proceedings of the 19th Australasian Computer Science Conference, - Melbourne, Australia. Jan 31 - Feb 2, 1996. - ftp://ftp.cs.auckland.ac.nz/pub/peter-f/ACSC96paper.ps -@end example -Kunihiko Sadakane's sorting algorithm, mentioned above, -is available from: -@example -http://naomi.is.s.u-tokyo.ac.jp/~sada/papers/Sada98b.ps.gz -@end example -The Manber-Myers suffix array construction -algorithm is described in a paper -available from: -@example -http://www.cs.arizona.edu/people/gene/PAPERS/suffix.ps -@end example -Finally, the following paper documents some recent investigations -I made into the performance of sorting algorithms: -@example -Julian Seward: - On the Performance of BWT Sorting Algorithms - Proceedings of the IEEE Data Compression Conference 2000 - Snowbird, Utah. 28-30 March 2000. -@end example - - -@contents - -@bye - diff --git a/winsup/bz2lib/manual_1.html b/winsup/bz2lib/manual_1.html deleted file mode 100644 index 92ba7c6..0000000 --- a/winsup/bz2lib/manual_1.html +++ /dev/null @@ -1,47 +0,0 @@ -<HTML> -<HEAD> -<!-- This HTML file has been created by texi2html 1.54 - from manual.texi on 23 March 2000 --> - -<TITLE>bzip2 and libbzip2 - Introduction</TITLE> -<link href="manual_2.html" rel=Next> -<link href="manual_toc.html" rel=ToC> - -</HEAD> -<BODY> -<p>Go to the first, previous, <A HREF="manual_2.html">next</A>, <A HREF="manual_4.html">last</A> section, <A HREF="manual_toc.html">table of contents</A>. -<P><HR><P> - - -<H1><A NAME="SEC1" HREF="manual_toc.html#TOC1">Introduction</A></H1> - -<P> -<CODE>bzip2</CODE> compresses files using the Burrows-Wheeler -block-sorting text compression algorithm, and Huffman coding. -Compression is generally considerably better than that -achieved by more conventional LZ77/LZ78-based compressors, -and approaches the performance of the PPM family of statistical compressors. - -</P> -<P> -<CODE>bzip2</CODE> is built on top of <CODE>libbzip2</CODE>, a flexible library -for handling compressed data in the <CODE>bzip2</CODE> format. This manual -describes both how to use the program and -how to work with the library interface. Most of the -manual is devoted to this library, not the program, -which is good news if your interest is only in the program. - -</P> -<P> -Chapter 2 describes how to use <CODE>bzip2</CODE>; this is the only part -you need to read if you just want to know how to operate the program. -Chapter 3 describes the programming interfaces in detail, and -Chapter 4 records some miscellaneous notes which I thought -ought to be recorded somewhere. - -</P> - -<P><HR><P> -<p>Go to the first, previous, <A HREF="manual_2.html">next</A>, <A HREF="manual_4.html">last</A> section, <A HREF="manual_toc.html">table of contents</A>. -</BODY> -</HTML> diff --git a/winsup/bz2lib/manual_2.html b/winsup/bz2lib/manual_2.html deleted file mode 100644 index 39453c4..0000000 --- a/winsup/bz2lib/manual_2.html +++ /dev/null @@ -1,484 +0,0 @@ -<HTML> -<HEAD> -<!-- This HTML file has been created by texi2html 1.54 - from manual.texi on 23 March 2000 --> - -<TITLE>bzip2 and libbzip2 - How to use bzip2</TITLE> -<link href="manual_3.html" rel=Next> -<link href="manual_1.html" rel=Previous> -<link href="manual_toc.html" rel=ToC> - -</HEAD> -<BODY> -<p>Go to the <A HREF="manual_1.html">first</A>, <A HREF="manual_1.html">previous</A>, <A HREF="manual_3.html">next</A>, <A HREF="manual_4.html">last</A> section, <A HREF="manual_toc.html">table of contents</A>. -<P><HR><P> - - -<H1><A NAME="SEC2" HREF="manual_toc.html#TOC2">How to use <CODE>bzip2</CODE></A></H1> - -<P> -This chapter contains a copy of the <CODE>bzip2</CODE> man page, -and nothing else. - -</P> - -<BLOCKQUOTE> - - - -<H4><A NAME="SEC3" HREF="manual_toc.html#TOC3">NAME</A></H4> - -<UL> -<LI><CODE>bzip2</CODE>, <CODE>bunzip2</CODE> - -- a block-sorting file compressor, v1.0 -<LI><CODE>bzcat</CODE> - -- decompresses files to stdout -<LI><CODE>bzip2recover</CODE> - -- recovers data from damaged bzip2 files -</UL> - - - -<H4><A NAME="SEC4" HREF="manual_toc.html#TOC4">SYNOPSIS</A></H4> - -<UL> -<LI><CODE>bzip2</CODE> [ -cdfkqstvzVL123456789 ] [ filenames ... ] - -<LI><CODE>bunzip2</CODE> [ -fkvsVL ] [ filenames ... ] - -<LI><CODE>bzcat</CODE> [ -s ] [ filenames ... ] - -<LI><CODE>bzip2recover</CODE> filename - -</UL> - - - -<H4><A NAME="SEC5" HREF="manual_toc.html#TOC5">DESCRIPTION</A></H4> - -<P> -<CODE>bzip2</CODE> compresses files using the Burrows-Wheeler block sorting -text compression algorithm, and Huffman coding. Compression is -generally considerably better than that achieved by more conventional -LZ77/LZ78-based compressors, and approaches the performance of the PPM -family of statistical compressors. - -</P> -<P> -The command-line options are deliberately very similar to those of GNU -<CODE>gzip</CODE>, but they are not identical. - -</P> -<P> -<CODE>bzip2</CODE> expects a list of file names to accompany the command-line -flags. Each file is replaced by a compressed version of itself, with -the name <CODE>original_name.bz2</CODE>. Each compressed file has the same -modification date, permissions, and, when possible, ownership as the -corresponding original, so that these properties can be correctly -restored at decompression time. File name handling is naive in the -sense that there is no mechanism for preserving original file names, -permissions, ownerships or dates in filesystems which lack these -concepts, or have serious file name length restrictions, such as MS-DOS. - -</P> -<P> -<CODE>bzip2</CODE> and <CODE>bunzip2</CODE> will by default not overwrite existing -files. If you want this to happen, specify the <CODE>-f</CODE> flag. - -</P> -<P> -If no file names are specified, <CODE>bzip2</CODE> compresses from standard -input to standard output. In this case, <CODE>bzip2</CODE> will decline to -write compressed output to a terminal, as this would be entirely -incomprehensible and therefore pointless. - -</P> -<P> -<CODE>bunzip2</CODE> (or <CODE>bzip2 -d</CODE>) decompresses all -specified files. Files which were not created by <CODE>bzip2</CODE> -will be detected and ignored, and a warning issued. -<CODE>bzip2</CODE> attempts to guess the filename for the decompressed file -from that of the compressed file as follows: - -<UL> -<LI><CODE>filename.bz2 </CODE> becomes <CODE>filename</CODE> - -<LI><CODE>filename.bz </CODE> becomes <CODE>filename</CODE> - -<LI><CODE>filename.tbz2</CODE> becomes <CODE>filename.tar</CODE> - -<LI><CODE>filename.tbz </CODE> becomes <CODE>filename.tar</CODE> - -<LI><CODE>anyothername </CODE> becomes <CODE>anyothername.out</CODE> - -</UL> - -<P> -If the file does not end in one of the recognised endings, -<CODE>.bz2</CODE>, <CODE>.bz</CODE>, -<CODE>.tbz2</CODE> or <CODE>.tbz</CODE>, <CODE>bzip2</CODE> complains that it cannot -guess the name of the original file, and uses the original name -with <CODE>.out</CODE> appended. - -</P> -<P> -As with compression, supplying no -filenames causes decompression from standard input to standard output. - -</P> -<P> -<CODE>bunzip2</CODE> will correctly decompress a file which is the -concatenation of two or more compressed files. The result is the -concatenation of the corresponding uncompressed files. Integrity -testing (<CODE>-t</CODE>) of concatenated compressed files is also supported. - -</P> -<P> -You can also compress or decompress files to the standard output by -giving the <CODE>-c</CODE> flag. Multiple files may be compressed and -decompressed like this. The resulting outputs are fed sequentially to -stdout. Compression of multiple files in this manner generates a stream -containing multiple compressed file representations. Such a stream -can be decompressed correctly only by <CODE>bzip2</CODE> version 0.9.0 or -later. Earlier versions of <CODE>bzip2</CODE> will stop after decompressing -the first file in the stream. - -</P> -<P> -<CODE>bzcat</CODE> (or <CODE>bzip2 -dc</CODE>) decompresses all specified files to -the standard output. - -</P> -<P> -<CODE>bzip2</CODE> will read arguments from the environment variables -<CODE>BZIP2</CODE> and <CODE>BZIP</CODE>, in that order, and will process them -before any arguments read from the command line. This gives a -convenient way to supply default arguments. - -</P> -<P> -Compression is always performed, even if the compressed file is slightly -larger than the original. Files of less than about one hundred bytes -tend to get larger, since the compression mechanism has a constant -overhead in the region of 50 bytes. Random data (including the output -of most file compressors) is coded at about 8.05 bits per byte, giving -an expansion of around 0.5%. - -</P> -<P> -As a self-check for your protection, <CODE>bzip2</CODE> uses 32-bit CRCs to -make sure that the decompressed version of a file is identical to the -original. This guards against corruption of the compressed data, and -against undetected bugs in <CODE>bzip2</CODE> (hopefully very unlikely). The -chances of data corruption going undetected is microscopic, about one -chance in four billion for each file processed. Be aware, though, that -the check occurs upon decompression, so it can only tell you that -something is wrong. It can't help you recover the original uncompressed -data. You can use <CODE>bzip2recover</CODE> to try to recover data from -damaged files. - -</P> -<P> -Return values: 0 for a normal exit, 1 for environmental problems (file -not found, invalid flags, I/O errors, &c), 2 to indicate a corrupt -compressed file, 3 for an internal consistency error (eg, bug) which -caused <CODE>bzip2</CODE> to panic. - -</P> - - - -<H4><A NAME="SEC6" HREF="manual_toc.html#TOC6">OPTIONS</A></H4> -<DL COMPACT> - -<DT><CODE>-c --stdout</CODE> -<DD> -Compress or decompress to standard output. -<DT><CODE>-d --decompress</CODE> -<DD> -Force decompression. <CODE>bzip2</CODE>, <CODE>bunzip2</CODE> and <CODE>bzcat</CODE> are -really the same program, and the decision about what actions to take is -done on the basis of which name is used. This flag overrides that -mechanism, and forces bzip2 to decompress. -<DT><CODE>-z --compress</CODE> -<DD> -The complement to <CODE>-d</CODE>: forces compression, regardless of the -invokation name. -<DT><CODE>-t --test</CODE> -<DD> -Check integrity of the specified file(s), but don't decompress them. -This really performs a trial decompression and throws away the result. -<DT><CODE>-f --force</CODE> -<DD> -Force overwrite of output files. Normally, <CODE>bzip2</CODE> will not overwrite -existing output files. Also forces <CODE>bzip2</CODE> to break hard links -to files, which it otherwise wouldn't do. -<DT><CODE>-k --keep</CODE> -<DD> -Keep (don't delete) input files during compression -or decompression. -<DT><CODE>-s --small</CODE> -<DD> -Reduce memory usage, for compression, decompression and testing. Files -are decompressed and tested using a modified algorithm which only -requires 2.5 bytes per block byte. This means any file can be -decompressed in 2300k of memory, albeit at about half the normal speed. - -During compression, <CODE>-s</CODE> selects a block size of 200k, which limits -memory use to around the same figure, at the expense of your compression -ratio. In short, if your machine is low on memory (8 megabytes or -less), use -s for everything. See MEMORY MANAGEMENT below. -<DT><CODE>-q --quiet</CODE> -<DD> -Suppress non-essential warning messages. Messages pertaining to -I/O errors and other critical events will not be suppressed. -<DT><CODE>-v --verbose</CODE> -<DD> -Verbose mode -- show the compression ratio for each file processed. -Further <CODE>-v</CODE>'s increase the verbosity level, spewing out lots of -information which is primarily of interest for diagnostic purposes. -<DT><CODE>-L --license -V --version</CODE> -<DD> -Display the software version, license terms and conditions. -<DT><CODE>-1 to -9</CODE> -<DD> -Set the block size to 100 k, 200 k .. 900 k when compressing. Has no -effect when decompressing. See MEMORY MANAGEMENT below. -<DT><CODE>--</CODE> -<DD> -Treats all subsequent arguments as file names, even if they start -with a dash. This is so you can handle files with names beginning -with a dash, for example: <CODE>bzip2 -- -myfilename</CODE>. -<DT><CODE>--repetitive-fast</CODE> -<DD> -<DT><CODE>--repetitive-best</CODE> -<DD> -These flags are redundant in versions 0.9.5 and above. They provided -some coarse control over the behaviour of the sorting algorithm in -earlier versions, which was sometimes useful. 0.9.5 and above have an -improved algorithm which renders these flags irrelevant. -</DL> - - - -<H4><A NAME="SEC7" HREF="manual_toc.html#TOC7">MEMORY MANAGEMENT</A></H4> - -<P> -<CODE>bzip2</CODE> compresses large files in blocks. The block size affects -both the compression ratio achieved, and the amount of memory needed for -compression and decompression. The flags <CODE>-1</CODE> through <CODE>-9</CODE> -specify the block size to be 100,000 bytes through 900,000 bytes (the -default) respectively. At decompression time, the block size used for -compression is read from the header of the compressed file, and -<CODE>bunzip2</CODE> then allocates itself just enough memory to decompress -the file. Since block sizes are stored in compressed files, it follows -that the flags <CODE>-1</CODE> to <CODE>-9</CODE> are irrelevant to and so ignored -during decompression. - -</P> -<P> -Compression and decompression requirements, in bytes, can be estimated -as: - -<PRE> - Compression: 400k + ( 8 x block size ) - - Decompression: 100k + ( 4 x block size ), or - 100k + ( 2.5 x block size ) -</PRE> - -<P> -Larger block sizes give rapidly diminishing marginal returns. Most of -the compression comes from the first two or three hundred k of block -size, a fact worth bearing in mind when using <CODE>bzip2</CODE> on small machines. -It is also important to appreciate that the decompression memory -requirement is set at compression time by the choice of block size. - -</P> -<P> -For files compressed with the default 900k block size, <CODE>bunzip2</CODE> -will require about 3700 kbytes to decompress. To support decompression -of any file on a 4 megabyte machine, <CODE>bunzip2</CODE> has an option to -decompress using approximately half this amount of memory, about 2300 -kbytes. Decompression speed is also halved, so you should use this -option only where necessary. The relevant flag is <CODE>-s</CODE>. - -</P> -<P> -In general, try and use the largest block size memory constraints allow, -since that maximises the compression achieved. Compression and -decompression speed are virtually unaffected by block size. - -</P> -<P> -Another significant point applies to files which fit in a single block --- that means most files you'd encounter using a large block size. The -amount of real memory touched is proportional to the size of the file, -since the file is smaller than a block. For example, compressing a file -20,000 bytes long with the flag <CODE>-9</CODE> will cause the compressor to -allocate around 7600k of memory, but only touch 400k + 20000 * 8 = 560 -kbytes of it. Similarly, the decompressor will allocate 3700k but only -touch 100k + 20000 * 4 = 180 kbytes. - -</P> -<P> -Here is a table which summarises the maximum memory usage for different -block sizes. Also recorded is the total compressed size for 14 files of -the Calgary Text Compression Corpus totalling 3,141,622 bytes. This -column gives some feel for how compression varies with block size. -These figures tend to understate the advantage of larger block sizes for -larger files, since the Corpus is dominated by smaller files. - -<PRE> - Compress Decompress Decompress Corpus - Flag usage usage -s usage Size - - -1 1200k 500k 350k 914704 - -2 2000k 900k 600k 877703 - -3 2800k 1300k 850k 860338 - -4 3600k 1700k 1100k 846899 - -5 4400k 2100k 1350k 845160 - -6 5200k 2500k 1600k 838626 - -7 6100k 2900k 1850k 834096 - -8 6800k 3300k 2100k 828642 - -9 7600k 3700k 2350k 828642 -</PRE> - - - -<H4><A NAME="SEC8" HREF="manual_toc.html#TOC8">RECOVERING DATA FROM DAMAGED FILES</A></H4> - -<P> -<CODE>bzip2</CODE> compresses files in blocks, usually 900kbytes long. Each -block is handled independently. If a media or transmission error causes -a multi-block <CODE>.bz2</CODE> file to become damaged, it may be possible to -recover data from the undamaged blocks in the file. - -</P> -<P> -The compressed representation of each block is delimited by a 48-bit -pattern, which makes it possible to find the block boundaries with -reasonable certainty. Each block also carries its own 32-bit CRC, so -damaged blocks can be distinguished from undamaged ones. - -</P> -<P> -<CODE>bzip2recover</CODE> is a simple program whose purpose is to search for -blocks in <CODE>.bz2</CODE> files, and write each block out into its own -<CODE>.bz2</CODE> file. You can then use <CODE>bzip2 -t</CODE> to test the -integrity of the resulting files, and decompress those which are -undamaged. - -</P> -<P> -<CODE>bzip2recover</CODE> -takes a single argument, the name of the damaged file, -and writes a number of files <CODE>rec0001file.bz2</CODE>, - <CODE>rec0002file.bz2</CODE>, etc, containing the extracted blocks. - The output filenames are designed so that the use of - wildcards in subsequent processing -- for example, -<CODE>bzip2 -dc rec*file.bz2 > recovered_data</CODE> -- lists the files in - the correct order. - -</P> -<P> -<CODE>bzip2recover</CODE> should be of most use dealing with large <CODE>.bz2</CODE> - files, as these will contain many blocks. It is clearly - futile to use it on damaged single-block files, since a - damaged block cannot be recovered. If you wish to minimise -any potential data loss through media or transmission errors, -you might consider compressing with a smaller - block size. - -</P> - - - -<H4><A NAME="SEC9" HREF="manual_toc.html#TOC9">PERFORMANCE NOTES</A></H4> - -<P> -The sorting phase of compression gathers together similar strings in the -file. Because of this, files containing very long runs of repeated -symbols, like "aabaabaabaab ..." (repeated several hundred times) may -compress more slowly than normal. Versions 0.9.5 and above fare much -better than previous versions in this respect. The ratio between -worst-case and average-case compression time is in the region of 10:1. -For previous versions, this figure was more like 100:1. You can use the -<CODE>-vvvv</CODE> option to monitor progress in great detail, if you want. - -</P> -<P> -Decompression speed is unaffected by these phenomena. - -</P> -<P> -<CODE>bzip2</CODE> usually allocates several megabytes of memory to operate -in, and then charges all over it in a fairly random fashion. This means -that performance, both for compressing and decompressing, is largely -determined by the speed at which your machine can service cache misses. -Because of this, small changes to the code to reduce the miss rate have -been observed to give disproportionately large performance improvements. -I imagine <CODE>bzip2</CODE> will perform best on machines with very large -caches. - -</P> - - - -<H4><A NAME="SEC10" HREF="manual_toc.html#TOC10">CAVEATS</A></H4> - -<P> -I/O error messages are not as helpful as they could be. <CODE>bzip2</CODE> -tries hard to detect I/O errors and exit cleanly, but the details of -what the problem is sometimes seem rather misleading. - -</P> -<P> -This manual page pertains to version 1.0 of <CODE>bzip2</CODE>. Compressed -data created by this version is entirely forwards and backwards -compatible with the previous public releases, versions 0.1pl2, 0.9.0 and -0.9.5, but with the following exception: 0.9.0 and above can correctly -decompress multiple concatenated compressed files. 0.1pl2 cannot do -this; it will stop after decompressing just the first file in the -stream. - -</P> -<P> -<CODE>bzip2recover</CODE> uses 32-bit integers to represent bit positions in -compressed files, so it cannot handle compressed files more than 512 -megabytes long. This could easily be fixed. - -</P> - - - -<H4><A NAME="SEC11" HREF="manual_toc.html#TOC11">AUTHOR</A></H4> -<P> -Julian Seward, <CODE>jseward@acm.org</CODE>. - -</P> -<P> -The ideas embodied in <CODE>bzip2</CODE> are due to (at least) the following -people: Michael Burrows and David Wheeler (for the block sorting -transformation), David Wheeler (again, for the Huffman coder), Peter -Fenwick (for the structured coding model in the original <CODE>bzip</CODE>, -and many refinements), and Alistair Moffat, Radford Neal and Ian Witten -(for the arithmetic coder in the original <CODE>bzip</CODE>). I am much -indebted for their help, support and advice. See the manual in the -source distribution for pointers to sources of documentation. Christian -von Roques encouraged me to look for faster sorting algorithms, so as to -speed up compression. Bela Lubkin encouraged me to improve the -worst-case compression performance. Many people sent patches, helped -with portability problems, lent machines, gave advice and were generally -helpful. - -</P> -</BLOCKQUOTE> - -<P><HR><P> -<p>Go to the <A HREF="manual_1.html">first</A>, <A HREF="manual_1.html">previous</A>, <A HREF="manual_3.html">next</A>, <A HREF="manual_4.html">last</A> section, <A HREF="manual_toc.html">table of contents</A>. -</BODY> -</HTML> diff --git a/winsup/bz2lib/manual_3.html b/winsup/bz2lib/manual_3.html deleted file mode 100644 index a8fa7e6..0000000 --- a/winsup/bz2lib/manual_3.html +++ /dev/null @@ -1,1773 +0,0 @@ -<HTML> -<HEAD> -<!-- This HTML file has been created by texi2html 1.54 - from manual.texi on 23 March 2000 --> - -<TITLE>bzip2 and libbzip2 - Programming with libbzip2</TITLE> -<link href="manual_4.html" rel=Next> -<link href="manual_2.html" rel=Previous> -<link href="manual_toc.html" rel=ToC> - -</HEAD> -<BODY> -<p>Go to the <A HREF="manual_1.html">first</A>, <A HREF="manual_2.html">previous</A>, <A HREF="manual_4.html">next</A>, <A HREF="manual_4.html">last</A> section, <A HREF="manual_toc.html">table of contents</A>. -<P><HR><P> - - -<H1><A NAME="SEC12" HREF="manual_toc.html#TOC12">Programming with <CODE>libbzip2</CODE></A></H1> - -<P> -This chapter describes the programming interface to <CODE>libbzip2</CODE>. - -</P> -<P> -For general background information, particularly about memory -use and performance aspects, you'd be well advised to read Chapter 2 -as well. - -</P> - - -<H2><A NAME="SEC13" HREF="manual_toc.html#TOC13">Top-level structure</A></H2> - -<P> -<CODE>libbzip2</CODE> is a flexible library for compressing and decompressing -data in the <CODE>bzip2</CODE> data format. Although packaged as a single -entity, it helps to regard the library as three separate parts: the low -level interface, and the high level interface, and some utility -functions. - -</P> -<P> -The structure of <CODE>libbzip2</CODE>'s interfaces is similar to -that of Jean-loup Gailly's and Mark Adler's excellent <CODE>zlib</CODE> -library. - -</P> -<P> -All externally visible symbols have names beginning <CODE>BZ2_</CODE>. -This is new in version 1.0. The intention is to minimise pollution -of the namespaces of library clients. - -</P> - - -<H3><A NAME="SEC14" HREF="manual_toc.html#TOC14">Low-level summary</A></H3> - -<P> -This interface provides services for compressing and decompressing -data in memory. There's no provision for dealing with files, streams -or any other I/O mechanisms, just straight memory-to-memory work. -In fact, this part of the library can be compiled without inclusion -of <CODE>stdio.h</CODE>, which may be helpful for embedded applications. - -</P> -<P> -The low-level part of the library has no global variables and -is therefore thread-safe. - -</P> -<P> -Six routines make up the low level interface: -<CODE>BZ2_bzCompressInit</CODE>, <CODE>BZ2_bzCompress</CODE>, and <BR> <CODE>BZ2_bzCompressEnd</CODE> -for compression, -and a corresponding trio <CODE>BZ2_bzDecompressInit</CODE>, <BR> <CODE>BZ2_bzDecompress</CODE> -and <CODE>BZ2_bzDecompressEnd</CODE> for decompression. -The <CODE>*Init</CODE> functions allocate -memory for compression/decompression and do other -initialisations, whilst the <CODE>*End</CODE> functions close down operations -and release memory. - -</P> -<P> -The real work is done by <CODE>BZ2_bzCompress</CODE> and <CODE>BZ2_bzDecompress</CODE>. -These compress and decompress data from a user-supplied input buffer -to a user-supplied output buffer. These buffers can be any size; -arbitrary quantities of data are handled by making repeated calls -to these functions. This is a flexible mechanism allowing a -consumer-pull style of activity, or producer-push, or a mixture of -both. - -</P> - - - -<H3><A NAME="SEC15" HREF="manual_toc.html#TOC15">High-level summary</A></H3> - -<P> -This interface provides some handy wrappers around the low-level -interface to facilitate reading and writing <CODE>bzip2</CODE> format -files (<CODE>.bz2</CODE> files). The routines provide hooks to facilitate -reading files in which the <CODE>bzip2</CODE> data stream is embedded -within some larger-scale file structure, or where there are -multiple <CODE>bzip2</CODE> data streams concatenated end-to-end. - -</P> -<P> -For reading files, <CODE>BZ2_bzReadOpen</CODE>, <CODE>BZ2_bzRead</CODE>, -<CODE>BZ2_bzReadClose</CODE> and <BR> <CODE>BZ2_bzReadGetUnused</CODE> are supplied. For -writing files, <CODE>BZ2_bzWriteOpen</CODE>, <CODE>BZ2_bzWrite</CODE> and -<CODE>BZ2_bzWriteFinish</CODE> are available. - -</P> -<P> -As with the low-level library, no global variables are used -so the library is per se thread-safe. However, if I/O errors -occur whilst reading or writing the underlying compressed files, -you may have to consult <CODE>errno</CODE> to determine the cause of -the error. In that case, you'd need a C library which correctly -supports <CODE>errno</CODE> in a multithreaded environment. - -</P> -<P> -To make the library a little simpler and more portable, -<CODE>BZ2_bzReadOpen</CODE> and <CODE>BZ2_bzWriteOpen</CODE> require you to pass them file -handles (<CODE>FILE*</CODE>s) which have previously been opened for reading or -writing respectively. That avoids portability problems associated with -file operations and file attributes, whilst not being much of an -imposition on the programmer. - -</P> - - - -<H3><A NAME="SEC16" HREF="manual_toc.html#TOC16">Utility functions summary</A></H3> -<P> -For very simple needs, <CODE>BZ2_bzBuffToBuffCompress</CODE> and -<CODE>BZ2_bzBuffToBuffDecompress</CODE> are provided. These compress -data in memory from one buffer to another buffer in a single -function call. You should assess whether these functions -fulfill your memory-to-memory compression/decompression -requirements before investing effort in understanding the more -general but more complex low-level interface. - -</P> -<P> -Yoshioka Tsuneo (<CODE>QWF00133@niftyserve.or.jp</CODE> / -<CODE>tsuneo-y@is.aist-nara.ac.jp</CODE>) has contributed some functions to -give better <CODE>zlib</CODE> compatibility. These functions are -<CODE>BZ2_bzopen</CODE>, <CODE>BZ2_bzread</CODE>, <CODE>BZ2_bzwrite</CODE>, <CODE>BZ2_bzflush</CODE>, -<CODE>BZ2_bzclose</CODE>, -<CODE>BZ2_bzerror</CODE> and <CODE>BZ2_bzlibVersion</CODE>. You may find these functions -more convenient for simple file reading and writing, than those in the -high-level interface. These functions are not (yet) officially part of -the library, and are minimally documented here. If they break, you -get to keep all the pieces. I hope to document them properly when time -permits. - -</P> -<P> -Yoshioka also contributed modifications to allow the library to be -built as a Windows DLL. - -</P> - - - -<H2><A NAME="SEC17" HREF="manual_toc.html#TOC17">Error handling</A></H2> - -<P> -The library is designed to recover cleanly in all situations, including -the worst-case situation of decompressing random data. I'm not -100% sure that it can always do this, so you might want to add -a signal handler to catch segmentation violations during decompression -if you are feeling especially paranoid. I would be interested in -hearing more about the robustness of the library to corrupted -compressed data. - -</P> -<P> -Version 1.0 is much more robust in this respect than -0.9.0 or 0.9.5. Investigations with Checker (a tool for -detecting problems with memory management, similar to Purify) -indicate that, at least for the few files I tested, all single-bit -errors in the decompressed data are caught properly, with no -segmentation faults, no reads of uninitialised data and no -out of range reads or writes. So it's certainly much improved, -although I wouldn't claim it to be totally bombproof. - -</P> -<P> -The file <CODE>bzlib.h</CODE> contains all definitions needed to use -the library. In particular, you should definitely not include -<CODE>bzlib_private.h</CODE>. - -</P> -<P> -In <CODE>bzlib.h</CODE>, the various return values are defined. The following -list is not intended as an exhaustive description of the circumstances -in which a given value may be returned -- those descriptions are given -later. Rather, it is intended to convey the rough meaning of each -return value. The first five actions are normal and not intended to -denote an error situation. -<DL COMPACT> - -<DT><CODE>BZ_OK</CODE> -<DD> -The requested action was completed successfully. -<DT><CODE>BZ_RUN_OK</CODE> -<DD> -<DT><CODE>BZ_FLUSH_OK</CODE> -<DD> -<DT><CODE>BZ_FINISH_OK</CODE> -<DD> -In <CODE>BZ2_bzCompress</CODE>, the requested flush/finish/nothing-special action -was completed successfully. -<DT><CODE>BZ_STREAM_END</CODE> -<DD> -Compression of data was completed, or the logical stream end was -detected during decompression. -</DL> - -<P> -The following return values indicate an error of some kind. -<DL COMPACT> - -<DT><CODE>BZ_CONFIG_ERROR</CODE> -<DD> -Indicates that the library has been improperly compiled on your -platform -- a major configuration error. Specifically, it means -that <CODE>sizeof(char)</CODE>, <CODE>sizeof(short)</CODE> and <CODE>sizeof(int)</CODE> -are not 1, 2 and 4 respectively, as they should be. Note that the -library should still work properly on 64-bit platforms which follow -the LP64 programming model -- that is, where <CODE>sizeof(long)</CODE> -and <CODE>sizeof(void*)</CODE> are 8. Under LP64, <CODE>sizeof(int)</CODE> is -still 4, so <CODE>libbzip2</CODE>, which doesn't use the <CODE>long</CODE> type, -is OK. -<DT><CODE>BZ_SEQUENCE_ERROR</CODE> -<DD> -When using the library, it is important to call the functions in the -correct sequence and with data structures (buffers etc) in the correct -states. <CODE>libbzip2</CODE> checks as much as it can to ensure this is -happening, and returns <CODE>BZ_SEQUENCE_ERROR</CODE> if not. Code which -complies precisely with the function semantics, as detailed below, -should never receive this value; such an event denotes buggy code -which you should investigate. -<DT><CODE>BZ_PARAM_ERROR</CODE> -<DD> -Returned when a parameter to a function call is out of range -or otherwise manifestly incorrect. As with <CODE>BZ_SEQUENCE_ERROR</CODE>, -this denotes a bug in the client code. The distinction between -<CODE>BZ_PARAM_ERROR</CODE> and <CODE>BZ_SEQUENCE_ERROR</CODE> is a bit hazy, but still worth -making. -<DT><CODE>BZ_MEM_ERROR</CODE> -<DD> -Returned when a request to allocate memory failed. Note that the -quantity of memory needed to decompress a stream cannot be determined -until the stream's header has been read. So <CODE>BZ2_bzDecompress</CODE> and -<CODE>BZ2_bzRead</CODE> may return <CODE>BZ_MEM_ERROR</CODE> even though some of -the compressed data has been read. The same is not true for -compression; once <CODE>BZ2_bzCompressInit</CODE> or <CODE>BZ2_bzWriteOpen</CODE> have -successfully completed, <CODE>BZ_MEM_ERROR</CODE> cannot occur. -<DT><CODE>BZ_DATA_ERROR</CODE> -<DD> -Returned when a data integrity error is detected during decompression. -Most importantly, this means when stored and computed CRCs for the -data do not match. This value is also returned upon detection of any -other anomaly in the compressed data. -<DT><CODE>BZ_DATA_ERROR_MAGIC</CODE> -<DD> -As a special case of <CODE>BZ_DATA_ERROR</CODE>, it is sometimes useful to -know when the compressed stream does not start with the correct -magic bytes (<CODE>'B' 'Z' 'h'</CODE>). -<DT><CODE>BZ_IO_ERROR</CODE> -<DD> -Returned by <CODE>BZ2_bzRead</CODE> and <CODE>BZ2_bzWrite</CODE> when there is an error -reading or writing in the compressed file, and by <CODE>BZ2_bzReadOpen</CODE> -and <CODE>BZ2_bzWriteOpen</CODE> for attempts to use a file for which the -error indicator (viz, <CODE>ferror(f)</CODE>) is set. -On receipt of <CODE>BZ_IO_ERROR</CODE>, the caller should consult -<CODE>errno</CODE> and/or <CODE>perror</CODE> to acquire operating-system -specific information about the problem. -<DT><CODE>BZ_UNEXPECTED_EOF</CODE> -<DD> -Returned by <CODE>BZ2_bzRead</CODE> when the compressed file finishes -before the logical end of stream is detected. -<DT><CODE>BZ_OUTBUFF_FULL</CODE> -<DD> -Returned by <CODE>BZ2_bzBuffToBuffCompress</CODE> and -<CODE>BZ2_bzBuffToBuffDecompress</CODE> to indicate that the output data -will not fit into the output buffer provided. -</DL> - - - -<H2><A NAME="SEC18" HREF="manual_toc.html#TOC18">Low-level interface</A></H2> - - - -<H3><A NAME="SEC19" HREF="manual_toc.html#TOC19"><CODE>BZ2_bzCompressInit</CODE></A></H3> - -<PRE> -typedef - struct { - char *next_in; - unsigned int avail_in; - unsigned int total_in_lo32; - unsigned int total_in_hi32; - - char *next_out; - unsigned int avail_out; - unsigned int total_out_lo32; - unsigned int total_out_hi32; - - void *state; - - void *(*bzalloc)(void *,int,int); - void (*bzfree)(void *,void *); - void *opaque; - } - bz_stream; - -int BZ2_bzCompressInit ( bz_stream *strm, - int blockSize100k, - int verbosity, - int workFactor ); - -</PRE> - -<P> -Prepares for compression. The <CODE>bz_stream</CODE> structure -holds all data pertaining to the compression activity. -A <CODE>bz_stream</CODE> structure should be allocated and initialised -prior to the call. -The fields of <CODE>bz_stream</CODE> -comprise the entirety of the user-visible data. <CODE>state</CODE> -is a pointer to the private data structures required for compression. - -</P> -<P> -Custom memory allocators are supported, via fields <CODE>bzalloc</CODE>, -<CODE>bzfree</CODE>, -and <CODE>opaque</CODE>. The value -<CODE>opaque</CODE> is passed to as the first argument to -all calls to <CODE>bzalloc</CODE> and <CODE>bzfree</CODE>, but is -otherwise ignored by the library. -The call <CODE>bzalloc ( opaque, n, m )</CODE> is expected to return a -pointer <CODE>p</CODE> to -<CODE>n * m</CODE> bytes of memory, and <CODE>bzfree ( opaque, p )</CODE> -should free -that memory. - -</P> -<P> -If you don't want to use a custom memory allocator, set <CODE>bzalloc</CODE>, -<CODE>bzfree</CODE> and -<CODE>opaque</CODE> to <CODE>NULL</CODE>, -and the library will then use the standard <CODE>malloc</CODE>/<CODE>free</CODE> -routines. - -</P> -<P> -Before calling <CODE>BZ2_bzCompressInit</CODE>, fields <CODE>bzalloc</CODE>, -<CODE>bzfree</CODE> and <CODE>opaque</CODE> should -be filled appropriately, as just described. Upon return, the internal -state will have been allocated and initialised, and <CODE>total_in_lo32</CODE>, -<CODE>total_in_hi32</CODE>, <CODE>total_out_lo32</CODE> and -<CODE>total_out_hi32</CODE> will have been set to zero. -These four fields are used by the library -to inform the caller of the total amount of data passed into and out of -the library, respectively. You should not try to change them. -As of version 1.0, 64-bit counts are maintained, even on 32-bit -platforms, using the <CODE>_hi32</CODE> fields to store the upper 32 bits -of the count. So, for example, the total amount of data in -is <CODE>(total_in_hi32 << 32) + total_in_lo32</CODE>. - -</P> -<P> -Parameter <CODE>blockSize100k</CODE> specifies the block size to be used for -compression. It should be a value between 1 and 9 inclusive, and the -actual block size used is 100000 x this figure. 9 gives the best -compression but takes most memory. - -</P> -<P> -Parameter <CODE>verbosity</CODE> should be set to a number between 0 and 4 -inclusive. 0 is silent, and greater numbers give increasingly verbose -monitoring/debugging output. If the library has been compiled with -<CODE>-DBZ_NO_STDIO</CODE>, no such output will appear for any verbosity -setting. - -</P> -<P> -Parameter <CODE>workFactor</CODE> controls how the compression phase behaves -when presented with worst case, highly repetitive, input data. If -compression runs into difficulties caused by repetitive data, the -library switches from the standard sorting algorithm to a fallback -algorithm. The fallback is slower than the standard algorithm by -perhaps a factor of three, but always behaves reasonably, no matter how -bad the input. - -</P> -<P> -Lower values of <CODE>workFactor</CODE> reduce the amount of effort the -standard algorithm will expend before resorting to the fallback. You -should set this parameter carefully; too low, and many inputs will be -handled by the fallback algorithm and so compress rather slowly, too -high, and your average-to-worst case compression times can become very -large. The default value of 30 gives reasonable behaviour over a wide -range of circumstances. - -</P> -<P> -Allowable values range from 0 to 250 inclusive. 0 is a special case, -equivalent to using the default value of 30. - -</P> -<P> -Note that the compressed output generated is the same regardless of -whether or not the fallback algorithm is used. - -</P> -<P> -Be aware also that this parameter may disappear entirely in future -versions of the library. In principle it should be possible to devise a -good way to automatically choose which algorithm to use. Such a -mechanism would render the parameter obsolete. - -</P> -<P> -Possible return values: - -<PRE> - <CODE>BZ_CONFIG_ERROR</CODE> - if the library has been mis-compiled - <CODE>BZ_PARAM_ERROR</CODE> - if <CODE>strm</CODE> is <CODE>NULL</CODE> - or <CODE>blockSize</CODE> < 1 or <CODE>blockSize</CODE> > 9 - or <CODE>verbosity</CODE> < 0 or <CODE>verbosity</CODE> > 4 - or <CODE>workFactor</CODE> < 0 or <CODE>workFactor</CODE> > 250 - <CODE>BZ_MEM_ERROR</CODE> - if not enough memory is available - <CODE>BZ_OK</CODE> - otherwise -</PRE> - -<P> -Allowable next actions: - -<PRE> - <CODE>BZ2_bzCompress</CODE> - if <CODE>BZ_OK</CODE> is returned - no specific action needed in case of error -</PRE> - - - -<H3><A NAME="SEC20" HREF="manual_toc.html#TOC20"><CODE>BZ2_bzCompress</CODE></A></H3> - -<PRE> - int BZ2_bzCompress ( bz_stream *strm, int action ); -</PRE> - -<P> -Provides more input and/or output buffer space for the library. The -caller maintains input and output buffers, and calls <CODE>BZ2_bzCompress</CODE> to -transfer data between them. - -</P> -<P> -Before each call to <CODE>BZ2_bzCompress</CODE>, <CODE>next_in</CODE> should point at -the data to be compressed, and <CODE>avail_in</CODE> should indicate how many -bytes the library may read. <CODE>BZ2_bzCompress</CODE> updates <CODE>next_in</CODE>, -<CODE>avail_in</CODE> and <CODE>total_in</CODE> to reflect the number of bytes it -has read. - -</P> -<P> -Similarly, <CODE>next_out</CODE> should point to a buffer in which the -compressed data is to be placed, with <CODE>avail_out</CODE> indicating how -much output space is available. <CODE>BZ2_bzCompress</CODE> updates -<CODE>next_out</CODE>, <CODE>avail_out</CODE> and <CODE>total_out</CODE> to reflect the -number of bytes output. - -</P> -<P> -You may provide and remove as little or as much data as you like on each -call of <CODE>BZ2_bzCompress</CODE>. In the limit, it is acceptable to supply and -remove data one byte at a time, although this would be terribly -inefficient. You should always ensure that at least one byte of output -space is available at each call. - -</P> -<P> -A second purpose of <CODE>BZ2_bzCompress</CODE> is to request a change of mode of the -compressed stream. - -</P> -<P> -Conceptually, a compressed stream can be in one of four states: IDLE, -RUNNING, FLUSHING and FINISHING. Before initialisation -(<CODE>BZ2_bzCompressInit</CODE>) and after termination (<CODE>BZ2_bzCompressEnd</CODE>), a -stream is regarded as IDLE. - -</P> -<P> -Upon initialisation (<CODE>BZ2_bzCompressInit</CODE>), the stream is placed in the -RUNNING state. Subsequent calls to <CODE>BZ2_bzCompress</CODE> should pass -<CODE>BZ_RUN</CODE> as the requested action; other actions are illegal and -will result in <CODE>BZ_SEQUENCE_ERROR</CODE>. - -</P> -<P> -At some point, the calling program will have provided all the input data -it wants to. It will then want to finish up -- in effect, asking the -library to process any data it might have buffered internally. In this -state, <CODE>BZ2_bzCompress</CODE> will no longer attempt to read data from -<CODE>next_in</CODE>, but it will want to write data to <CODE>next_out</CODE>. -Because the output buffer supplied by the user can be arbitrarily small, -the finishing-up operation cannot necessarily be done with a single call -of <CODE>BZ2_bzCompress</CODE>. - -</P> -<P> -Instead, the calling program passes <CODE>BZ_FINISH</CODE> as an action to -<CODE>BZ2_bzCompress</CODE>. This changes the stream's state to FINISHING. Any -remaining input (ie, <CODE>next_in[0 .. avail_in-1]</CODE>) is compressed and -transferred to the output buffer. To do this, <CODE>BZ2_bzCompress</CODE> must be -called repeatedly until all the output has been consumed. At that -point, <CODE>BZ2_bzCompress</CODE> returns <CODE>BZ_STREAM_END</CODE>, and the stream's -state is set back to IDLE. <CODE>BZ2_bzCompressEnd</CODE> should then be -called. - -</P> -<P> -Just to make sure the calling program does not cheat, the library makes -a note of <CODE>avail_in</CODE> at the time of the first call to -<CODE>BZ2_bzCompress</CODE> which has <CODE>BZ_FINISH</CODE> as an action (ie, at the -time the program has announced its intention to not supply any more -input). By comparing this value with that of <CODE>avail_in</CODE> over -subsequent calls to <CODE>BZ2_bzCompress</CODE>, the library can detect any -attempts to slip in more data to compress. Any calls for which this is -detected will return <CODE>BZ_SEQUENCE_ERROR</CODE>. This indicates a -programming mistake which should be corrected. - -</P> -<P> -Instead of asking to finish, the calling program may ask -<CODE>BZ2_bzCompress</CODE> to take all the remaining input, compress it and -terminate the current (Burrows-Wheeler) compression block. This could -be useful for error control purposes. The mechanism is analogous to -that for finishing: call <CODE>BZ2_bzCompress</CODE> with an action of -<CODE>BZ_FLUSH</CODE>, remove output data, and persist with the -<CODE>BZ_FLUSH</CODE> action until the value <CODE>BZ_RUN</CODE> is returned. As -with finishing, <CODE>BZ2_bzCompress</CODE> detects any attempt to provide more -input data once the flush has begun. - -</P> -<P> -Once the flush is complete, the stream returns to the normal RUNNING -state. - -</P> -<P> -This all sounds pretty complex, but isn't really. Here's a table -which shows which actions are allowable in each state, what action -will be taken, what the next state is, and what the non-error return -values are. Note that you can't explicitly ask what state the -stream is in, but nor do you need to -- it can be inferred from the -values returned by <CODE>BZ2_bzCompress</CODE>. - -<PRE> -IDLE/<CODE>any</CODE> - Illegal. IDLE state only exists after <CODE>BZ2_bzCompressEnd</CODE> or - before <CODE>BZ2_bzCompressInit</CODE>. - Return value = <CODE>BZ_SEQUENCE_ERROR</CODE> - -RUNNING/<CODE>BZ_RUN</CODE> - Compress from <CODE>next_in</CODE> to <CODE>next_out</CODE> as much as possible. - Next state = RUNNING - Return value = <CODE>BZ_RUN_OK</CODE> - -RUNNING/<CODE>BZ_FLUSH</CODE> - Remember current value of <CODE>next_in</CODE>. Compress from <CODE>next_in</CODE> - to <CODE>next_out</CODE> as much as possible, but do not accept any more input. - Next state = FLUSHING - Return value = <CODE>BZ_FLUSH_OK</CODE> - -RUNNING/<CODE>BZ_FINISH</CODE> - Remember current value of <CODE>next_in</CODE>. Compress from <CODE>next_in</CODE> - to <CODE>next_out</CODE> as much as possible, but do not accept any more input. - Next state = FINISHING - Return value = <CODE>BZ_FINISH_OK</CODE> - -FLUSHING/<CODE>BZ_FLUSH</CODE> - Compress from <CODE>next_in</CODE> to <CODE>next_out</CODE> as much as possible, - but do not accept any more input. - If all the existing input has been used up and all compressed - output has been removed - Next state = RUNNING; Return value = <CODE>BZ_RUN_OK</CODE> - else - Next state = FLUSHING; Return value = <CODE>BZ_FLUSH_OK</CODE> - -FLUSHING/other - Illegal. - Return value = <CODE>BZ_SEQUENCE_ERROR</CODE> - -FINISHING/<CODE>BZ_FINISH</CODE> - Compress from <CODE>next_in</CODE> to <CODE>next_out</CODE> as much as possible, - but to not accept any more input. - If all the existing input has been used up and all compressed - output has been removed - Next state = IDLE; Return value = <CODE>BZ_STREAM_END</CODE> - else - Next state = FINISHING; Return value = <CODE>BZ_FINISHING</CODE> - -FINISHING/other - Illegal. - Return value = <CODE>BZ_SEQUENCE_ERROR</CODE> -</PRE> - -<P> -That still looks complicated? Well, fair enough. The usual sequence -of calls for compressing a load of data is: - -<UL> -<LI>Get started with <CODE>BZ2_bzCompressInit</CODE>. - -<LI>Shovel data in and shlurp out its compressed form using zero or more - -calls of <CODE>BZ2_bzCompress</CODE> with action = <CODE>BZ_RUN</CODE>. -<LI>Finish up. - -Repeatedly call <CODE>BZ2_bzCompress</CODE> with action = <CODE>BZ_FINISH</CODE>, -copying out the compressed output, until <CODE>BZ_STREAM_END</CODE> is returned. -<LI>Close up and go home. Call <CODE>BZ2_bzCompressEnd</CODE>. - -</UL> - -<P> -If the data you want to compress fits into your input buffer all -at once, you can skip the calls of <CODE>BZ2_bzCompress ( ..., BZ_RUN )</CODE> and -just do the <CODE>BZ2_bzCompress ( ..., BZ_FINISH )</CODE> calls. - -</P> -<P> -All required memory is allocated by <CODE>BZ2_bzCompressInit</CODE>. The -compression library can accept any data at all (obviously). So you -shouldn't get any error return values from the <CODE>BZ2_bzCompress</CODE> calls. -If you do, they will be <CODE>BZ_SEQUENCE_ERROR</CODE>, and indicate a bug in -your programming. - -</P> -<P> -Trivial other possible return values: - -<PRE> - <CODE>BZ_PARAM_ERROR</CODE> - if <CODE>strm</CODE> is <CODE>NULL</CODE>, or <CODE>strm->s</CODE> is <CODE>NULL</CODE> -</PRE> - - - -<H3><A NAME="SEC21" HREF="manual_toc.html#TOC21"><CODE>BZ2_bzCompressEnd</CODE></A></H3> - -<PRE> -int BZ2_bzCompressEnd ( bz_stream *strm ); -</PRE> - -<P> -Releases all memory associated with a compression stream. - -</P> -<P> -Possible return values: - -<PRE> - <CODE>BZ_PARAM_ERROR</CODE> if <CODE>strm</CODE> is <CODE>NULL</CODE> or <CODE>strm->s</CODE> is <CODE>NULL</CODE> - <CODE>BZ_OK</CODE> otherwise -</PRE> - - - -<H3><A NAME="SEC22" HREF="manual_toc.html#TOC22"><CODE>BZ2_bzDecompressInit</CODE></A></H3> - -<PRE> -int BZ2_bzDecompressInit ( bz_stream *strm, int verbosity, int small ); -</PRE> - -<P> -Prepares for decompression. As with <CODE>BZ2_bzCompressInit</CODE>, a -<CODE>bz_stream</CODE> record should be allocated and initialised before the -call. Fields <CODE>bzalloc</CODE>, <CODE>bzfree</CODE> and <CODE>opaque</CODE> should be -set if a custom memory allocator is required, or made <CODE>NULL</CODE> for -the normal <CODE>malloc</CODE>/<CODE>free</CODE> routines. Upon return, the internal -state will have been initialised, and <CODE>total_in</CODE> and -<CODE>total_out</CODE> will be zero. - -</P> -<P> -For the meaning of parameter <CODE>verbosity</CODE>, see <CODE>BZ2_bzCompressInit</CODE>. - -</P> -<P> -If <CODE>small</CODE> is nonzero, the library will use an alternative -decompression algorithm which uses less memory but at the cost of -decompressing more slowly (roughly speaking, half the speed, but the -maximum memory requirement drops to around 2300k). See Chapter 2 for -more information on memory management. - -</P> -<P> -Note that the amount of memory needed to decompress -a stream cannot be determined until the stream's header has been read, -so even if <CODE>BZ2_bzDecompressInit</CODE> succeeds, a subsequent -<CODE>BZ2_bzDecompress</CODE> could fail with <CODE>BZ_MEM_ERROR</CODE>. - -</P> -<P> -Possible return values: - -<PRE> - <CODE>BZ_CONFIG_ERROR</CODE> - if the library has been mis-compiled - <CODE>BZ_PARAM_ERROR</CODE> - if <CODE>(small != 0 && small != 1)</CODE> - or <CODE>(verbosity < 0 || verbosity > 4)</CODE> - <CODE>BZ_MEM_ERROR</CODE> - if insufficient memory is available -</PRE> - -<P> -Allowable next actions: - -<PRE> - <CODE>BZ2_bzDecompress</CODE> - if <CODE>BZ_OK</CODE> was returned - no specific action required in case of error -</PRE> - -<P> - - -</P> - - -<H3><A NAME="SEC23" HREF="manual_toc.html#TOC23"><CODE>BZ2_bzDecompress</CODE></A></H3> - -<PRE> -int BZ2_bzDecompress ( bz_stream *strm ); -</PRE> - -<P> -Provides more input and/out output buffer space for the library. The -caller maintains input and output buffers, and uses <CODE>BZ2_bzDecompress</CODE> -to transfer data between them. - -</P> -<P> -Before each call to <CODE>BZ2_bzDecompress</CODE>, <CODE>next_in</CODE> -should point at the compressed data, -and <CODE>avail_in</CODE> should indicate how many bytes the library -may read. <CODE>BZ2_bzDecompress</CODE> updates <CODE>next_in</CODE>, <CODE>avail_in</CODE> -and <CODE>total_in</CODE> -to reflect the number of bytes it has read. - -</P> -<P> -Similarly, <CODE>next_out</CODE> should point to a buffer in which the uncompressed -output is to be placed, with <CODE>avail_out</CODE> indicating how much output space -is available. <CODE>BZ2_bzCompress</CODE> updates <CODE>next_out</CODE>, -<CODE>avail_out</CODE> and <CODE>total_out</CODE> to reflect -the number of bytes output. - -</P> -<P> -You may provide and remove as little or as much data as you like on -each call of <CODE>BZ2_bzDecompress</CODE>. -In the limit, it is acceptable to -supply and remove data one byte at a time, although this would be -terribly inefficient. You should always ensure that at least one -byte of output space is available at each call. - -</P> -<P> -Use of <CODE>BZ2_bzDecompress</CODE> is simpler than <CODE>BZ2_bzCompress</CODE>. - -</P> -<P> -You should provide input and remove output as described above, and -repeatedly call <CODE>BZ2_bzDecompress</CODE> until <CODE>BZ_STREAM_END</CODE> is -returned. Appearance of <CODE>BZ_STREAM_END</CODE> denotes that -<CODE>BZ2_bzDecompress</CODE> has detected the logical end of the compressed -stream. <CODE>BZ2_bzDecompress</CODE> will not produce <CODE>BZ_STREAM_END</CODE> until -all output data has been placed into the output buffer, so once -<CODE>BZ_STREAM_END</CODE> appears, you are guaranteed to have available all -the decompressed output, and <CODE>BZ2_bzDecompressEnd</CODE> can safely be -called. - -</P> -<P> -If case of an error return value, you should call <CODE>BZ2_bzDecompressEnd</CODE> -to clean up and release memory. - -</P> -<P> -Possible return values: - -<PRE> - <CODE>BZ_PARAM_ERROR</CODE> - if <CODE>strm</CODE> is <CODE>NULL</CODE> or <CODE>strm->s</CODE> is <CODE>NULL</CODE> - or <CODE>strm->avail_out < 1</CODE> - <CODE>BZ_DATA_ERROR</CODE> - if a data integrity error is detected in the compressed stream - <CODE>BZ_DATA_ERROR_MAGIC</CODE> - if the compressed stream doesn't begin with the right magic bytes - <CODE>BZ_MEM_ERROR</CODE> - if there wasn't enough memory available - <CODE>BZ_STREAM_END</CODE> - if the logical end of the data stream was detected and all - output in has been consumed, eg <CODE>s->avail_out > 0</CODE> - <CODE>BZ_OK</CODE> - otherwise -</PRE> - -<P> -Allowable next actions: - -<PRE> - <CODE>BZ2_bzDecompress</CODE> - if <CODE>BZ_OK</CODE> was returned - <CODE>BZ2_bzDecompressEnd</CODE> - otherwise -</PRE> - - - -<H3><A NAME="SEC24" HREF="manual_toc.html#TOC24"><CODE>BZ2_bzDecompressEnd</CODE></A></H3> - -<PRE> -int BZ2_bzDecompressEnd ( bz_stream *strm ); -</PRE> - -<P> -Releases all memory associated with a decompression stream. - -</P> -<P> -Possible return values: - -<PRE> - <CODE>BZ_PARAM_ERROR</CODE> - if <CODE>strm</CODE> is <CODE>NULL</CODE> or <CODE>strm->s</CODE> is <CODE>NULL</CODE> - <CODE>BZ_OK</CODE> - otherwise -</PRE> - -<P> -Allowable next actions: - -<PRE> - None. -</PRE> - - - -<H2><A NAME="SEC25" HREF="manual_toc.html#TOC25">High-level interface</A></H2> - -<P> -This interface provides functions for reading and writing -<CODE>bzip2</CODE> format files. First, some general points. - -</P> - -<UL> -<LI>All of the functions take an <CODE>int*</CODE> first argument, - - <CODE>bzerror</CODE>. - After each call, <CODE>bzerror</CODE> should be consulted first to determine - the outcome of the call. If <CODE>bzerror</CODE> is <CODE>BZ_OK</CODE>, - the call completed - successfully, and only then should the return value of the function - (if any) be consulted. If <CODE>bzerror</CODE> is <CODE>BZ_IO_ERROR</CODE>, - there was an error - reading/writing the underlying compressed file, and you should - then consult <CODE>errno</CODE>/<CODE>perror</CODE> to determine the - cause of the difficulty. - <CODE>bzerror</CODE> may also be set to various other values; precise details are - given on a per-function basis below. -<LI>If <CODE>bzerror</CODE> indicates an error - - (ie, anything except <CODE>BZ_OK</CODE> and <CODE>BZ_STREAM_END</CODE>), - you should immediately call <CODE>BZ2_bzReadClose</CODE> (or <CODE>BZ2_bzWriteClose</CODE>, - depending on whether you are attempting to read or to write) - to free up all resources associated - with the stream. Once an error has been indicated, behaviour of all calls - except <CODE>BZ2_bzReadClose</CODE> (<CODE>BZ2_bzWriteClose</CODE>) is undefined. - The implication is that (1) <CODE>bzerror</CODE> should - be checked after each call, and (2) if <CODE>bzerror</CODE> indicates an error, - <CODE>BZ2_bzReadClose</CODE> (<CODE>BZ2_bzWriteClose</CODE>) should then be called to clean up. -<LI>The <CODE>FILE*</CODE> arguments passed to - - <CODE>BZ2_bzReadOpen</CODE>/<CODE>BZ2_bzWriteOpen</CODE> - should be set to binary mode. - Most Unix systems will do this by default, but other platforms, - including Windows and Mac, will not. If you omit this, you may - encounter problems when moving code to new platforms. -<LI>Memory allocation requests are handled by - - <CODE>malloc</CODE>/<CODE>free</CODE>. - At present - there is no facility for user-defined memory allocators in the file I/O - functions (could easily be added, though). -</UL> - - - -<H3><A NAME="SEC26" HREF="manual_toc.html#TOC26"><CODE>BZ2_bzReadOpen</CODE></A></H3> - -<PRE> - typedef void BZFILE; - - BZFILE *BZ2_bzReadOpen ( int *bzerror, FILE *f, - int small, int verbosity, - void *unused, int nUnused ); -</PRE> - -<P> -Prepare to read compressed data from file handle <CODE>f</CODE>. <CODE>f</CODE> -should refer to a file which has been opened for reading, and for which -the error indicator (<CODE>ferror(f)</CODE>)is not set. If <CODE>small</CODE> is 1, -the library will try to decompress using less memory, at the expense of -speed. - -</P> -<P> -For reasons explained below, <CODE>BZ2_bzRead</CODE> will decompress the -<CODE>nUnused</CODE> bytes starting at <CODE>unused</CODE>, before starting to read -from the file <CODE>f</CODE>. At most <CODE>BZ_MAX_UNUSED</CODE> bytes may be -supplied like this. If this facility is not required, you should pass -<CODE>NULL</CODE> and <CODE>0</CODE> for <CODE>unused</CODE> and n<CODE>Unused</CODE> -respectively. - -</P> -<P> -For the meaning of parameters <CODE>small</CODE> and <CODE>verbosity</CODE>, -see <CODE>BZ2_bzDecompressInit</CODE>. - -</P> -<P> -The amount of memory needed to decompress a file cannot be determined -until the file's header has been read. So it is possible that -<CODE>BZ2_bzReadOpen</CODE> returns <CODE>BZ_OK</CODE> but a subsequent call of -<CODE>BZ2_bzRead</CODE> will return <CODE>BZ_MEM_ERROR</CODE>. - -</P> -<P> -Possible assignments to <CODE>bzerror</CODE>: - -<PRE> - <CODE>BZ_CONFIG_ERROR</CODE> - if the library has been mis-compiled - <CODE>BZ_PARAM_ERROR</CODE> - if <CODE>f</CODE> is <CODE>NULL</CODE> - or <CODE>small</CODE> is neither <CODE>0</CODE> nor <CODE>1</CODE> - or <CODE>(unused == NULL && nUnused != 0)</CODE> - or <CODE>(unused != NULL && !(0 <= nUnused <= BZ_MAX_UNUSED))</CODE> - <CODE>BZ_IO_ERROR</CODE> - if <CODE>ferror(f)</CODE> is nonzero - <CODE>BZ_MEM_ERROR</CODE> - if insufficient memory is available - <CODE>BZ_OK</CODE> - otherwise. -</PRE> - -<P> -Possible return values: - -<PRE> - Pointer to an abstract <CODE>BZFILE</CODE> - if <CODE>bzerror</CODE> is <CODE>BZ_OK</CODE> - <CODE>NULL</CODE> - otherwise -</PRE> - -<P> -Allowable next actions: - -<PRE> - <CODE>BZ2_bzRead</CODE> - if <CODE>bzerror</CODE> is <CODE>BZ_OK</CODE> - <CODE>BZ2_bzClose</CODE> - otherwise -</PRE> - - - -<H3><A NAME="SEC27" HREF="manual_toc.html#TOC27"><CODE>BZ2_bzRead</CODE></A></H3> - -<PRE> - int BZ2_bzRead ( int *bzerror, BZFILE *b, void *buf, int len ); -</PRE> - -<P> -Reads up to <CODE>len</CODE> (uncompressed) bytes from the compressed file -<CODE>b</CODE> into -the buffer <CODE>buf</CODE>. If the read was successful, -<CODE>bzerror</CODE> is set to <CODE>BZ_OK</CODE> -and the number of bytes read is returned. If the logical end-of-stream -was detected, <CODE>bzerror</CODE> will be set to <CODE>BZ_STREAM_END</CODE>, -and the number -of bytes read is returned. All other <CODE>bzerror</CODE> values denote an error. - -</P> -<P> -<CODE>BZ2_bzRead</CODE> will supply <CODE>len</CODE> bytes, -unless the logical stream end is detected -or an error occurs. Because of this, it is possible to detect the -stream end by observing when the number of bytes returned is -less than the number -requested. Nevertheless, this is regarded as inadvisable; you should -instead check <CODE>bzerror</CODE> after every call and watch out for -<CODE>BZ_STREAM_END</CODE>. - -</P> -<P> -Internally, <CODE>BZ2_bzRead</CODE> copies data from the compressed file in chunks -of size <CODE>BZ_MAX_UNUSED</CODE> bytes -before decompressing it. If the file contains more bytes than strictly -needed to reach the logical end-of-stream, <CODE>BZ2_bzRead</CODE> will almost certainly -read some of the trailing data before signalling <CODE>BZ_SEQUENCE_END</CODE>. -To collect the read but unused data once <CODE>BZ_SEQUENCE_END</CODE> has -appeared, call <CODE>BZ2_bzReadGetUnused</CODE> immediately before <CODE>BZ2_bzReadClose</CODE>. - -</P> -<P> -Possible assignments to <CODE>bzerror</CODE>: - -<PRE> - <CODE>BZ_PARAM_ERROR</CODE> - if <CODE>b</CODE> is <CODE>NULL</CODE> or <CODE>buf</CODE> is <CODE>NULL</CODE> or <CODE>len < 0</CODE> - <CODE>BZ_SEQUENCE_ERROR</CODE> - if <CODE>b</CODE> was opened with <CODE>BZ2_bzWriteOpen</CODE> - <CODE>BZ_IO_ERROR</CODE> - if there is an error reading from the compressed file - <CODE>BZ_UNEXPECTED_EOF</CODE> - if the compressed file ended before the logical end-of-stream was detected - <CODE>BZ_DATA_ERROR</CODE> - if a data integrity error was detected in the compressed stream - <CODE>BZ_DATA_ERROR_MAGIC</CODE> - if the stream does not begin with the requisite header bytes (ie, is not - a <CODE>bzip2</CODE> data file). This is really a special case of <CODE>BZ_DATA_ERROR</CODE>. - <CODE>BZ_MEM_ERROR</CODE> - if insufficient memory was available - <CODE>BZ_STREAM_END</CODE> - if the logical end of stream was detected. - <CODE>BZ_OK</CODE> - otherwise. -</PRE> - -<P> -Possible return values: - -<PRE> - number of bytes read - if <CODE>bzerror</CODE> is <CODE>BZ_OK</CODE> or <CODE>BZ_STREAM_END</CODE> - undefined - otherwise -</PRE> - -<P> -Allowable next actions: - -<PRE> - collect data from <CODE>buf</CODE>, then <CODE>BZ2_bzRead</CODE> or <CODE>BZ2_bzReadClose</CODE> - if <CODE>bzerror</CODE> is <CODE>BZ_OK</CODE> - collect data from <CODE>buf</CODE>, then <CODE>BZ2_bzReadClose</CODE> or <CODE>BZ2_bzReadGetUnused</CODE> - if <CODE>bzerror</CODE> is <CODE>BZ_SEQUENCE_END</CODE> - <CODE>BZ2_bzReadClose</CODE> - otherwise -</PRE> - - - -<H3><A NAME="SEC28" HREF="manual_toc.html#TOC28"><CODE>BZ2_bzReadGetUnused</CODE></A></H3> - -<PRE> - void BZ2_bzReadGetUnused ( int* bzerror, BZFILE *b, - void** unused, int* nUnused ); -</PRE> - -<P> -Returns data which was read from the compressed file but was not needed -to get to the logical end-of-stream. <CODE>*unused</CODE> is set to the address -of the data, and <CODE>*nUnused</CODE> to the number of bytes. <CODE>*nUnused</CODE> will -be set to a value between <CODE>0</CODE> and <CODE>BZ_MAX_UNUSED</CODE> inclusive. - -</P> -<P> -This function may only be called once <CODE>BZ2_bzRead</CODE> has signalled -<CODE>BZ_STREAM_END</CODE> but before <CODE>BZ2_bzReadClose</CODE>. - -</P> -<P> -Possible assignments to <CODE>bzerror</CODE>: - -<PRE> - <CODE>BZ_PARAM_ERROR</CODE> - if <CODE>b</CODE> is <CODE>NULL</CODE> - or <CODE>unused</CODE> is <CODE>NULL</CODE> or <CODE>nUnused</CODE> is <CODE>NULL</CODE> - <CODE>BZ_SEQUENCE_ERROR</CODE> - if <CODE>BZ_STREAM_END</CODE> has not been signalled - or if <CODE>b</CODE> was opened with <CODE>BZ2_bzWriteOpen</CODE> - <CODE>BZ_OK</CODE> - otherwise -</PRE> - -<P> -Allowable next actions: - -<PRE> - <CODE>BZ2_bzReadClose</CODE> -</PRE> - - - -<H3><A NAME="SEC29" HREF="manual_toc.html#TOC29"><CODE>BZ2_bzReadClose</CODE></A></H3> - -<PRE> - void BZ2_bzReadClose ( int *bzerror, BZFILE *b ); -</PRE> - -<P> -Releases all memory pertaining to the compressed file <CODE>b</CODE>. -<CODE>BZ2_bzReadClose</CODE> does not call <CODE>fclose</CODE> on the underlying file -handle, so you should do that yourself if appropriate. -<CODE>BZ2_bzReadClose</CODE> should be called to clean up after all error -situations. - -</P> -<P> -Possible assignments to <CODE>bzerror</CODE>: - -<PRE> - <CODE>BZ_SEQUENCE_ERROR</CODE> - if <CODE>b</CODE> was opened with <CODE>BZ2_bzOpenWrite</CODE> - <CODE>BZ_OK</CODE> - otherwise -</PRE> - -<P> -Allowable next actions: - -<PRE> - none -</PRE> - - - -<H3><A NAME="SEC30" HREF="manual_toc.html#TOC30"><CODE>BZ2_bzWriteOpen</CODE></A></H3> - -<PRE> - BZFILE *BZ2_bzWriteOpen ( int *bzerror, FILE *f, - int blockSize100k, int verbosity, - int workFactor ); -</PRE> - -<P> -Prepare to write compressed data to file handle <CODE>f</CODE>. -<CODE>f</CODE> should refer to -a file which has been opened for writing, and for which the error -indicator (<CODE>ferror(f)</CODE>)is not set. - -</P> -<P> -For the meaning of parameters <CODE>blockSize100k</CODE>, -<CODE>verbosity</CODE> and <CODE>workFactor</CODE>, see -<BR> <CODE>BZ2_bzCompressInit</CODE>. - -</P> -<P> -All required memory is allocated at this stage, so if the call -completes successfully, <CODE>BZ_MEM_ERROR</CODE> cannot be signalled by a -subsequent call to <CODE>BZ2_bzWrite</CODE>. - -</P> -<P> -Possible assignments to <CODE>bzerror</CODE>: - -<PRE> - <CODE>BZ_CONFIG_ERROR</CODE> - if the library has been mis-compiled - <CODE>BZ_PARAM_ERROR</CODE> - if <CODE>f</CODE> is <CODE>NULL</CODE> - or <CODE>blockSize100k < 1</CODE> or <CODE>blockSize100k > 9</CODE> - <CODE>BZ_IO_ERROR</CODE> - if <CODE>ferror(f)</CODE> is nonzero - <CODE>BZ_MEM_ERROR</CODE> - if insufficient memory is available - <CODE>BZ_OK</CODE> - otherwise -</PRE> - -<P> -Possible return values: - -<PRE> - Pointer to an abstract <CODE>BZFILE</CODE> - if <CODE>bzerror</CODE> is <CODE>BZ_OK</CODE> - <CODE>NULL</CODE> - otherwise -</PRE> - -<P> -Allowable next actions: - -<PRE> - <CODE>BZ2_bzWrite</CODE> - if <CODE>bzerror</CODE> is <CODE>BZ_OK</CODE> - (you could go directly to <CODE>BZ2_bzWriteClose</CODE>, but this would be pretty pointless) - <CODE>BZ2_bzWriteClose</CODE> - otherwise -</PRE> - - - -<H3><A NAME="SEC31" HREF="manual_toc.html#TOC31"><CODE>BZ2_bzWrite</CODE></A></H3> - -<PRE> - void BZ2_bzWrite ( int *bzerror, BZFILE *b, void *buf, int len ); -</PRE> - -<P> -Absorbs <CODE>len</CODE> bytes from the buffer <CODE>buf</CODE>, eventually to be -compressed and written to the file. - -</P> -<P> -Possible assignments to <CODE>bzerror</CODE>: - -<PRE> - <CODE>BZ_PARAM_ERROR</CODE> - if <CODE>b</CODE> is <CODE>NULL</CODE> or <CODE>buf</CODE> is <CODE>NULL</CODE> or <CODE>len < 0</CODE> - <CODE>BZ_SEQUENCE_ERROR</CODE> - if b was opened with <CODE>BZ2_bzReadOpen</CODE> - <CODE>BZ_IO_ERROR</CODE> - if there is an error writing the compressed file. - <CODE>BZ_OK</CODE> - otherwise -</PRE> - - - -<H3><A NAME="SEC32" HREF="manual_toc.html#TOC32"><CODE>BZ2_bzWriteClose</CODE></A></H3> - -<PRE> - void BZ2_bzWriteClose ( int *bzerror, BZFILE* f, - int abandon, - unsigned int* nbytes_in, - unsigned int* nbytes_out ); - - void BZ2_bzWriteClose64 ( int *bzerror, BZFILE* f, - int abandon, - unsigned int* nbytes_in_lo32, - unsigned int* nbytes_in_hi32, - unsigned int* nbytes_out_lo32, - unsigned int* nbytes_out_hi32 ); -</PRE> - -<P> -Compresses and flushes to the compressed file all data so far supplied -by <CODE>BZ2_bzWrite</CODE>. The logical end-of-stream markers are also written, so -subsequent calls to <CODE>BZ2_bzWrite</CODE> are illegal. All memory associated -with the compressed file <CODE>b</CODE> is released. -<CODE>fflush</CODE> is called on the -compressed file, but it is not <CODE>fclose</CODE>'d. - -</P> -<P> -If <CODE>BZ2_bzWriteClose</CODE> is called to clean up after an error, the only -action is to release the memory. The library records the error codes -issued by previous calls, so this situation will be detected -automatically. There is no attempt to complete the compression -operation, nor to <CODE>fflush</CODE> the compressed file. You can force this -behaviour to happen even in the case of no error, by passing a nonzero -value to <CODE>abandon</CODE>. - -</P> -<P> -If <CODE>nbytes_in</CODE> is non-null, <CODE>*nbytes_in</CODE> will be set to be the -total volume of uncompressed data handled. Similarly, <CODE>nbytes_out</CODE> -will be set to the total volume of compressed data written. For -compatibility with older versions of the library, <CODE>BZ2_bzWriteClose</CODE> -only yields the lower 32 bits of these counts. Use -<CODE>BZ2_bzWriteClose64</CODE> if you want the full 64 bit counts. These -two functions are otherwise absolutely identical. - -</P> - -<P> -Possible assignments to <CODE>bzerror</CODE>: - -<PRE> - <CODE>BZ_SEQUENCE_ERROR</CODE> - if <CODE>b</CODE> was opened with <CODE>BZ2_bzReadOpen</CODE> - <CODE>BZ_IO_ERROR</CODE> - if there is an error writing the compressed file - <CODE>BZ_OK</CODE> - otherwise -</PRE> - - - -<H3><A NAME="SEC33" HREF="manual_toc.html#TOC33">Handling embedded compressed data streams</A></H3> - -<P> -The high-level library facilitates use of -<CODE>bzip2</CODE> data streams which form some part of a surrounding, larger -data stream. - -<UL> -<LI>For writing, the library takes an open file handle, writes - -compressed data to it, <CODE>fflush</CODE>es it but does not <CODE>fclose</CODE> it. -The calling application can write its own data before and after the -compressed data stream, using that same file handle. -<LI>Reading is more complex, and the facilities are not as general - -as they could be since generality is hard to reconcile with efficiency. -<CODE>BZ2_bzRead</CODE> reads from the compressed file in blocks of size -<CODE>BZ_MAX_UNUSED</CODE> bytes, and in doing so probably will overshoot -the logical end of compressed stream. -To recover this data once decompression has -ended, call <CODE>BZ2_bzReadGetUnused</CODE> after the last call of <CODE>BZ2_bzRead</CODE> -(the one returning <CODE>BZ_STREAM_END</CODE>) but before calling -<CODE>BZ2_bzReadClose</CODE>. -</UL> - -<P> -This mechanism makes it easy to decompress multiple <CODE>bzip2</CODE> -streams placed end-to-end. As the end of one stream, when <CODE>BZ2_bzRead</CODE> -returns <CODE>BZ_STREAM_END</CODE>, call <CODE>BZ2_bzReadGetUnused</CODE> to collect the -unused data (copy it into your own buffer somewhere). -That data forms the start of the next compressed stream. -To start uncompressing that next stream, call <CODE>BZ2_bzReadOpen</CODE> again, -feeding in the unused data via the <CODE>unused</CODE>/<CODE>nUnused</CODE> -parameters. -Keep doing this until <CODE>BZ_STREAM_END</CODE> return coincides with the -physical end of file (<CODE>feof(f)</CODE>). In this situation -<CODE>BZ2_bzReadGetUnused</CODE> -will of course return no data. - -</P> -<P> -This should give some feel for how the high-level interface can be used. -If you require extra flexibility, you'll have to bite the bullet and get -to grips with the low-level interface. - -</P> - - -<H3><A NAME="SEC34" HREF="manual_toc.html#TOC34">Standard file-reading/writing code</A></H3> -<P> -Here's how you'd write data to a compressed file: - -<PRE> -FILE* f; -BZFILE* b; -int nBuf; -char buf[ /* whatever size you like */ ]; -int bzerror; -int nWritten; - -f = fopen ( "myfile.bz2", "w" ); -if (!f) { - /* handle error */ -} -b = BZ2_bzWriteOpen ( &bzerror, f, 9 ); -if (bzerror != BZ_OK) { - BZ2_bzWriteClose ( b ); - /* handle error */ -} - -while ( /* condition */ ) { - /* get data to write into buf, and set nBuf appropriately */ - nWritten = BZ2_bzWrite ( &bzerror, b, buf, nBuf ); - if (bzerror == BZ_IO_ERROR) { - BZ2_bzWriteClose ( &bzerror, b ); - /* handle error */ - } -} - -BZ2_bzWriteClose ( &bzerror, b ); -if (bzerror == BZ_IO_ERROR) { - /* handle error */ -} -</PRE> - -<P> -And to read from a compressed file: - -<PRE> -FILE* f; -BZFILE* b; -int nBuf; -char buf[ /* whatever size you like */ ]; -int bzerror; -int nWritten; - -f = fopen ( "myfile.bz2", "r" ); -if (!f) { - /* handle error */ -} -b = BZ2_bzReadOpen ( &bzerror, f, 0, NULL, 0 ); -if (bzerror != BZ_OK) { - BZ2_bzReadClose ( &bzerror, b ); - /* handle error */ -} - -bzerror = BZ_OK; -while (bzerror == BZ_OK && /* arbitrary other conditions */) { - nBuf = BZ2_bzRead ( &bzerror, b, buf, /* size of buf */ ); - if (bzerror == BZ_OK) { - /* do something with buf[0 .. nBuf-1] */ - } -} -if (bzerror != BZ_STREAM_END) { - BZ2_bzReadClose ( &bzerror, b ); - /* handle error */ -} else { - BZ2_bzReadClose ( &bzerror ); -} -</PRE> - - - -<H2><A NAME="SEC35" HREF="manual_toc.html#TOC35">Utility functions</A></H2> - - -<H3><A NAME="SEC36" HREF="manual_toc.html#TOC36"><CODE>BZ2_bzBuffToBuffCompress</CODE></A></H3> - -<PRE> - int BZ2_bzBuffToBuffCompress( char* dest, - unsigned int* destLen, - char* source, - unsigned int sourceLen, - int blockSize100k, - int verbosity, - int workFactor ); -</PRE> - -<P> -Attempts to compress the data in <CODE>source[0 .. sourceLen-1]</CODE> -into the destination buffer, <CODE>dest[0 .. *destLen-1]</CODE>. -If the destination buffer is big enough, <CODE>*destLen</CODE> is -set to the size of the compressed data, and <CODE>BZ_OK</CODE> is -returned. If the compressed data won't fit, <CODE>*destLen</CODE> -is unchanged, and <CODE>BZ_OUTBUFF_FULL</CODE> is returned. - -</P> -<P> -Compression in this manner is a one-shot event, done with a single call -to this function. The resulting compressed data is a complete -<CODE>bzip2</CODE> format data stream. There is no mechanism for making -additional calls to provide extra input data. If you want that kind of -mechanism, use the low-level interface. - -</P> -<P> -For the meaning of parameters <CODE>blockSize100k</CODE>, <CODE>verbosity</CODE> -and <CODE>workFactor</CODE>, <BR> see <CODE>BZ2_bzCompressInit</CODE>. - -</P> -<P> -To guarantee that the compressed data will fit in its buffer, allocate -an output buffer of size 1% larger than the uncompressed data, plus -six hundred extra bytes. - -</P> -<P> -<CODE>BZ2_bzBuffToBuffDecompress</CODE> will not write data at or -beyond <CODE>dest[*destLen]</CODE>, even in case of buffer overflow. - -</P> -<P> -Possible return values: - -<PRE> - <CODE>BZ_CONFIG_ERROR</CODE> - if the library has been mis-compiled - <CODE>BZ_PARAM_ERROR</CODE> - if <CODE>dest</CODE> is <CODE>NULL</CODE> or <CODE>destLen</CODE> is <CODE>NULL</CODE> - or <CODE>blockSize100k < 1</CODE> or <CODE>blockSize100k > 9</CODE> - or <CODE>verbosity < 0</CODE> or <CODE>verbosity > 4</CODE> - or <CODE>workFactor < 0</CODE> or <CODE>workFactor > 250</CODE> - <CODE>BZ_MEM_ERROR</CODE> - if insufficient memory is available - <CODE>BZ_OUTBUFF_FULL</CODE> - if the size of the compressed data exceeds <CODE>*destLen</CODE> - <CODE>BZ_OK</CODE> - otherwise -</PRE> - - - -<H3><A NAME="SEC37" HREF="manual_toc.html#TOC37"><CODE>BZ2_bzBuffToBuffDecompress</CODE></A></H3> - -<PRE> - int BZ2_bzBuffToBuffDecompress ( char* dest, - unsigned int* destLen, - char* source, - unsigned int sourceLen, - int small, - int verbosity ); -</PRE> - -<P> -Attempts to decompress the data in <CODE>source[0 .. sourceLen-1]</CODE> -into the destination buffer, <CODE>dest[0 .. *destLen-1]</CODE>. -If the destination buffer is big enough, <CODE>*destLen</CODE> is -set to the size of the uncompressed data, and <CODE>BZ_OK</CODE> is -returned. If the compressed data won't fit, <CODE>*destLen</CODE> -is unchanged, and <CODE>BZ_OUTBUFF_FULL</CODE> is returned. - -</P> -<P> -<CODE>source</CODE> is assumed to hold a complete <CODE>bzip2</CODE> format -data stream. <BR> <CODE>BZ2_bzBuffToBuffDecompress</CODE> tries to decompress -the entirety of the stream into the output buffer. - -</P> -<P> -For the meaning of parameters <CODE>small</CODE> and <CODE>verbosity</CODE>, -see <CODE>BZ2_bzDecompressInit</CODE>. - -</P> -<P> -Because the compression ratio of the compressed data cannot be known in -advance, there is no easy way to guarantee that the output buffer will -be big enough. You may of course make arrangements in your code to -record the size of the uncompressed data, but such a mechanism is beyond -the scope of this library. - -</P> -<P> -<CODE>BZ2_bzBuffToBuffDecompress</CODE> will not write data at or -beyond <CODE>dest[*destLen]</CODE>, even in case of buffer overflow. - -</P> -<P> -Possible return values: - -<PRE> - <CODE>BZ_CONFIG_ERROR</CODE> - if the library has been mis-compiled - <CODE>BZ_PARAM_ERROR</CODE> - if <CODE>dest</CODE> is <CODE>NULL</CODE> or <CODE>destLen</CODE> is <CODE>NULL</CODE> - or <CODE>small != 0 && small != 1</CODE> - or <CODE>verbosity < 0</CODE> or <CODE>verbosity > 4</CODE> - <CODE>BZ_MEM_ERROR</CODE> - if insufficient memory is available - <CODE>BZ_OUTBUFF_FULL</CODE> - if the size of the compressed data exceeds <CODE>*destLen</CODE> - <CODE>BZ_DATA_ERROR</CODE> - if a data integrity error was detected in the compressed data - <CODE>BZ_DATA_ERROR_MAGIC</CODE> - if the compressed data doesn't begin with the right magic bytes - <CODE>BZ_UNEXPECTED_EOF</CODE> - if the compressed data ends unexpectedly - <CODE>BZ_OK</CODE> - otherwise -</PRE> - - - -<H2><A NAME="SEC38" HREF="manual_toc.html#TOC38"><CODE>zlib</CODE> compatibility functions</A></H2> -<P> -Yoshioka Tsuneo has contributed some functions to -give better <CODE>zlib</CODE> compatibility. These functions are -<CODE>BZ2_bzopen</CODE>, <CODE>BZ2_bzread</CODE>, <CODE>BZ2_bzwrite</CODE>, <CODE>BZ2_bzflush</CODE>, -<CODE>BZ2_bzclose</CODE>, -<CODE>BZ2_bzerror</CODE> and <CODE>BZ2_bzlibVersion</CODE>. -These functions are not (yet) officially part of -the library. If they break, you get to keep all the pieces. -Nevertheless, I think they work ok. - -<PRE> -typedef void BZFILE; - -const char * BZ2_bzlibVersion ( void ); -</PRE> - -<P> -Returns a string indicating the library version. - -<PRE> -BZFILE * BZ2_bzopen ( const char *path, const char *mode ); -BZFILE * BZ2_bzdopen ( int fd, const char *mode ); -</PRE> - -<P> -Opens a <CODE>.bz2</CODE> file for reading or writing, using either its name -or a pre-existing file descriptor. -Analogous to <CODE>fopen</CODE> and <CODE>fdopen</CODE>. - -<PRE> -int BZ2_bzread ( BZFILE* b, void* buf, int len ); -int BZ2_bzwrite ( BZFILE* b, void* buf, int len ); -</PRE> - -<P> -Reads/writes data from/to a previously opened <CODE>BZFILE</CODE>. -Analogous to <CODE>fread</CODE> and <CODE>fwrite</CODE>. - -<PRE> -int BZ2_bzflush ( BZFILE* b ); -void BZ2_bzclose ( BZFILE* b ); -</PRE> - -<P> -Flushes/closes a <CODE>BZFILE</CODE>. <CODE>BZ2_bzflush</CODE> doesn't actually do -anything. Analogous to <CODE>fflush</CODE> and <CODE>fclose</CODE>. - -</P> - -<PRE> -const char * BZ2_bzerror ( BZFILE *b, int *errnum ) -</PRE> - -<P> -Returns a string describing the more recent error status of -<CODE>b</CODE>, and also sets <CODE>*errnum</CODE> to its numerical value. - -</P> - - - -<H2><A NAME="SEC39" HREF="manual_toc.html#TOC39">Using the library in a <CODE>stdio</CODE>-free environment</A></H2> - - - -<H3><A NAME="SEC40" HREF="manual_toc.html#TOC40">Getting rid of <CODE>stdio</CODE></A></H3> - -<P> -In a deeply embedded application, you might want to use just -the memory-to-memory functions. You can do this conveniently -by compiling the library with preprocessor symbol <CODE>BZ_NO_STDIO</CODE> -defined. Doing this gives you a library containing only the following -eight functions: - -</P> -<P> -<CODE>BZ2_bzCompressInit</CODE>, <CODE>BZ2_bzCompress</CODE>, <CODE>BZ2_bzCompressEnd</CODE> <BR> -<CODE>BZ2_bzDecompressInit</CODE>, <CODE>BZ2_bzDecompress</CODE>, <CODE>BZ2_bzDecompressEnd</CODE> <BR> -<CODE>BZ2_bzBuffToBuffCompress</CODE>, <CODE>BZ2_bzBuffToBuffDecompress</CODE> - -</P> -<P> -When compiled like this, all functions will ignore <CODE>verbosity</CODE> -settings. - -</P> - - -<H3><A NAME="SEC41" HREF="manual_toc.html#TOC41">Critical error handling</A></H3> -<P> -<CODE>libbzip2</CODE> contains a number of internal assertion checks which -should, needless to say, never be activated. Nevertheless, if an -assertion should fail, behaviour depends on whether or not the library -was compiled with <CODE>BZ_NO_STDIO</CODE> set. - -</P> -<P> -For a normal compile, an assertion failure yields the message - -<PRE> - bzip2/libbzip2: internal error number N. - This is a bug in bzip2/libbzip2, 1.0 of 21-Mar-2000. - Please report it to me at: jseward@acm.org. If this happened - when you were using some program which uses libbzip2 as a - component, you should also report this bug to the author(s) - of that program. Please make an effort to report this bug; - timely and accurate bug reports eventually lead to higher - quality software. Thanks. Julian Seward, 21 March 2000. -</PRE> - -<P> -where <CODE>N</CODE> is some error code number. <CODE>exit(3)</CODE> -is then called. - -</P> -<P> -For a <CODE>stdio</CODE>-free library, assertion failures result -in a call to a function declared as: - -<PRE> - extern void bz_internal_error ( int errcode ); -</PRE> - -<P> -The relevant code is passed as a parameter. You should supply -such a function. - -</P> -<P> -In either case, once an assertion failure has occurred, any -<CODE>bz_stream</CODE> records involved can be regarded as invalid. -You should not attempt to resume normal operation with them. - -</P> -<P> -You may, of course, change critical error handling to suit -your needs. As I said above, critical errors indicate bugs -in the library and should not occur. All "normal" error -situations are indicated via error return codes from functions, -and can be recovered from. - -</P> - - - -<H2><A NAME="SEC42" HREF="manual_toc.html#TOC42">Making a Windows DLL</A></H2> -<P> -Everything related to Windows has been contributed by Yoshioka Tsuneo -<BR> (<CODE>QWF00133@niftyserve.or.jp</CODE> / -<CODE>tsuneo-y@is.aist-nara.ac.jp</CODE>), so you should send your queries to -him (but perhaps Cc: me, <CODE>jseward@acm.org</CODE>). - -</P> -<P> -My vague understanding of what to do is: using Visual C++ 5.0, -open the project file <CODE>libbz2.dsp</CODE>, and build. That's all. - -</P> -<P> -If you can't -open the project file for some reason, make a new one, naming these files: -<CODE>blocksort.c</CODE>, <CODE>bzlib.c</CODE>, <CODE>compress.c</CODE>, -<CODE>crctable.c</CODE>, <CODE>decompress.c</CODE>, <CODE>huffman.c</CODE>, <BR> -<CODE>randtable.c</CODE> and <CODE>libbz2.def</CODE>. You will also need -to name the header files <CODE>bzlib.h</CODE> and <CODE>bzlib_private.h</CODE>. - -</P> -<P> -If you don't use VC++, you may need to define the proprocessor symbol -<CODE>_WIN32</CODE>. - -</P> -<P> -Finally, <CODE>dlltest.c</CODE> is a sample program using the DLL. It has a -project file, <CODE>dlltest.dsp</CODE>. - -</P> -<P> -If you just want a makefile for Visual C, have a look at -<CODE>makefile.msc</CODE>. - -</P> -<P> -Be aware that if you compile <CODE>bzip2</CODE> itself on Win32, you must set -<CODE>BZ_UNIX</CODE> to 0 and <CODE>BZ_LCCWIN32</CODE> to 1, in the file -<CODE>bzip2.c</CODE>, before compiling. Otherwise the resulting binary won't -work correctly. - -</P> -<P> -I haven't tried any of this stuff myself, but it all looks plausible. - -</P> - -<P><HR><P> -<p>Go to the <A HREF="manual_1.html">first</A>, <A HREF="manual_2.html">previous</A>, <A HREF="manual_4.html">next</A>, <A HREF="manual_4.html">last</A> section, <A HREF="manual_toc.html">table of contents</A>. -</BODY> -</HTML> diff --git a/winsup/bz2lib/manual_4.html b/winsup/bz2lib/manual_4.html deleted file mode 100644 index 9ab7fb2..0000000 --- a/winsup/bz2lib/manual_4.html +++ /dev/null @@ -1,528 +0,0 @@ -<HTML> -<HEAD> -<!-- This HTML file has been created by texi2html 1.54 - from manual.texi on 23 March 2000 --> - -<TITLE>bzip2 and libbzip2 - Miscellanea</TITLE> -<link href="manual_3.html" rel=Previous> -<link href="manual_toc.html" rel=ToC> - -</HEAD> -<BODY> -<p>Go to the <A HREF="manual_1.html">first</A>, <A HREF="manual_3.html">previous</A>, next, last section, <A HREF="manual_toc.html">table of contents</A>. -<P><HR><P> - - -<H1><A NAME="SEC43" HREF="manual_toc.html#TOC43">Miscellanea</A></H1> - -<P> -These are just some random thoughts of mine. Your mileage may -vary. - -</P> - - -<H2><A NAME="SEC44" HREF="manual_toc.html#TOC44">Limitations of the compressed file format</A></H2> -<P> -<CODE>bzip2-1.0</CODE>, <CODE>0.9.5</CODE> and <CODE>0.9.0</CODE> -use exactly the same file format as the previous -version, <CODE>bzip2-0.1</CODE>. This decision was made in the interests of -stability. Creating yet another incompatible compressed file format -would create further confusion and disruption for users. - -</P> -<P> -Nevertheless, this is not a painless decision. Development -work since the release of <CODE>bzip2-0.1</CODE> in August 1997 -has shown complexities in the file format which slow down -decompression and, in retrospect, are unnecessary. These are: - -<UL> -<LI>The run-length encoder, which is the first of the - - compression transformations, is entirely irrelevant. - The original purpose was to protect the sorting algorithm - from the very worst case input: a string of repeated - symbols. But algorithm steps Q6a and Q6b in the original - Burrows-Wheeler technical report (SRC-124) show how - repeats can be handled without difficulty in block - sorting. -<LI>The randomisation mechanism doesn't really need to be - - there. Udi Manber and Gene Myers published a suffix - array construction algorithm a few years back, which - can be employed to sort any block, no matter how - repetitive, in O(N log N) time. Subsequent work by - Kunihiko Sadakane has produced a derivative O(N (log N)^2) - algorithm which usually outperforms the Manber-Myers - algorithm. - - I could have changed to Sadakane's algorithm, but I find - it to be slower than <CODE>bzip2</CODE>'s existing algorithm for - most inputs, and the randomisation mechanism protects - adequately against bad cases. I didn't think it was - a good tradeoff to make. Partly this is due to the fact - that I was not flooded with email complaints about - <CODE>bzip2-0.1</CODE>'s performance on repetitive data, so - perhaps it isn't a problem for real inputs. - - Probably the best long-term solution, - and the one I have incorporated into 0.9.5 and above, - is to use the existing sorting - algorithm initially, and fall back to a O(N (log N)^2) - algorithm if the standard algorithm gets into difficulties. -<LI>The compressed file format was never designed to be - - handled by a library, and I have had to jump though - some hoops to produce an efficient implementation of - decompression. It's a bit hairy. Try passing - <CODE>decompress.c</CODE> through the C preprocessor - and you'll see what I mean. Much of this complexity - could have been avoided if the compressed size of - each block of data was recorded in the data stream. -<LI>An Adler-32 checksum, rather than a CRC32 checksum, - - would be faster to compute. -</UL> - -<P> -It would be fair to say that the <CODE>bzip2</CODE> format was frozen -before I properly and fully understood the performance -consequences of doing so. - -</P> -<P> -Improvements which I was able to incorporate into -0.9.0, despite using the same file format, are: - -<UL> -<LI>Single array implementation of the inverse BWT. This - - significantly speeds up decompression, presumably - because it reduces the number of cache misses. -<LI>Faster inverse MTF transform for large MTF values. The - - new implementation is based on the notion of sliding blocks - of values. -<LI><CODE>bzip2-0.9.0</CODE> now reads and writes files with <CODE>fread</CODE> - - and <CODE>fwrite</CODE>; version 0.1 used <CODE>putc</CODE> and <CODE>getc</CODE>. - Duh! Well, you live and learn. - -</UL> - -<P> -Further ahead, it would be nice -to be able to do random access into files. This will -require some careful design of compressed file formats. - -</P> - - - -<H2><A NAME="SEC45" HREF="manual_toc.html#TOC45">Portability issues</A></H2> -<P> -After some consideration, I have decided not to use -GNU <CODE>autoconf</CODE> to configure 0.9.5 or 1.0. - -</P> -<P> -<CODE>autoconf</CODE>, admirable and wonderful though it is, -mainly assists with portability problems between Unix-like -platforms. But <CODE>bzip2</CODE> doesn't have much in the way -of portability problems on Unix; most of the difficulties appear -when porting to the Mac, or to Microsoft's operating systems. -<CODE>autoconf</CODE> doesn't help in those cases, and brings in a -whole load of new complexity. - -</P> -<P> -Most people should be able to compile the library and program -under Unix straight out-of-the-box, so to speak, especially -if you have a version of GNU C available. - -</P> -<P> -There are a couple of <CODE>__inline__</CODE> directives in the code. GNU C -(<CODE>gcc</CODE>) should be able to handle them. If you're not using -GNU C, your C compiler shouldn't see them at all. -If your compiler does, for some reason, see them and doesn't -like them, just <CODE>#define</CODE> <CODE>__inline__</CODE> to be <CODE>/* */</CODE>. One -easy way to do this is to compile with the flag <CODE>-D__inline__=</CODE>, -which should be understood by most Unix compilers. - -</P> -<P> -If you still have difficulties, try compiling with the macro -<CODE>BZ_STRICT_ANSI</CODE> defined. This should enable you to build the -library in a strictly ANSI compliant environment. Building the program -itself like this is dangerous and not supported, since you remove -<CODE>bzip2</CODE>'s checks against compressing directories, symbolic links, -devices, and other not-really-a-file entities. This could cause -filesystem corruption! - -</P> -<P> -One other thing: if you create a <CODE>bzip2</CODE> binary for public -distribution, please try and link it statically (<CODE>gcc -s</CODE>). This -avoids all sorts of library-version issues that others may encounter -later on. - -</P> -<P> -If you build <CODE>bzip2</CODE> on Win32, you must set <CODE>BZ_UNIX</CODE> to 0 and -<CODE>BZ_LCCWIN32</CODE> to 1, in the file <CODE>bzip2.c</CODE>, before compiling. -Otherwise the resulting binary won't work correctly. - -</P> - - - -<H2><A NAME="SEC46" HREF="manual_toc.html#TOC46">Reporting bugs</A></H2> -<P> -I tried pretty hard to make sure <CODE>bzip2</CODE> is -bug free, both by design and by testing. Hopefully -you'll never need to read this section for real. - -</P> -<P> -Nevertheless, if <CODE>bzip2</CODE> dies with a segmentation -fault, a bus error or an internal assertion failure, it -will ask you to email me a bug report. Experience with -version 0.1 shows that almost all these problems can -be traced to either compiler bugs or hardware problems. - -<UL> -<LI> - -Recompile the program with no optimisation, and see if it -works. And/or try a different compiler. -I heard all sorts of stories about various flavours -of GNU C (and other compilers) generating bad code for -<CODE>bzip2</CODE>, and I've run across two such examples myself. - -2.7.X versions of GNU C are known to generate bad code from -time to time, at high optimisation levels. -If you get problems, try using the flags -<CODE>-O2</CODE> <CODE>-fomit-frame-pointer</CODE> <CODE>-fno-strength-reduce</CODE>. -You should specifically <EM>not</EM> use <CODE>-funroll-loops</CODE>. - -You may notice that the Makefile runs six tests as part of -the build process. If the program passes all of these, it's -a pretty good (but not 100%) indication that the compiler has -done its job correctly. -<LI> - -If <CODE>bzip2</CODE> crashes randomly, and the crashes are not -repeatable, you may have a flaky memory subsystem. <CODE>bzip2</CODE> -really hammers your memory hierarchy, and if it's a bit marginal, -you may get these problems. Ditto if your disk or I/O subsystem -is slowly failing. Yup, this really does happen. - -Try using a different machine of the same type, and see if -you can repeat the problem. -<LI>This isn't really a bug, but ... If <CODE>bzip2</CODE> tells - -you your file is corrupted on decompression, and you -obtained the file via FTP, there is a possibility that you -forgot to tell FTP to do a binary mode transfer. That absolutely -will cause the file to be non-decompressible. You'll have to transfer -it again. -</UL> - -<P> -If you've incorporated <CODE>libbzip2</CODE> into your own program -and are getting problems, please, please, please, check that the -parameters you are passing in calls to the library, are -correct, and in accordance with what the documentation says -is allowable. I have tried to make the library robust against -such problems, but I'm sure I haven't succeeded. - -</P> -<P> -Finally, if the above comments don't help, you'll have to send -me a bug report. Now, it's just amazing how many people will -send me a bug report saying something like - -<PRE> - bzip2 crashed with segmentation fault on my machine -</PRE> - -<P> -and absolutely nothing else. Needless to say, a such a report -is <EM>totally, utterly, completely and comprehensively 100% useless; -a waste of your time, my time, and net bandwidth</EM>. -With no details at all, there's no way I can possibly begin -to figure out what the problem is. - -</P> -<P> -The rules of the game are: facts, facts, facts. Don't omit -them because "oh, they won't be relevant". At the bare -minimum: - -<PRE> - Machine type. Operating system version. - Exact version of <CODE>bzip2</CODE> (do <CODE>bzip2 -V</CODE>). - Exact version of the compiler used. - Flags passed to the compiler. -</PRE> - -<P> -However, the most important single thing that will help me is -the file that you were trying to compress or decompress at the -time the problem happened. Without that, my ability to do anything -more than speculate about the cause, is limited. - -</P> -<P> -Please remember that I connect to the Internet with a modem, so -you should contact me before mailing me huge files. - -</P> - - - -<H2><A NAME="SEC47" HREF="manual_toc.html#TOC47">Did you get the right package?</A></H2> - -<P> -<CODE>bzip2</CODE> is a resource hog. It soaks up large amounts of CPU cycles -and memory. Also, it gives very large latencies. In the worst case, you -can feed many megabytes of uncompressed data into the library before -getting any compressed output, so this probably rules out applications -requiring interactive behaviour. - -</P> -<P> -These aren't faults of my implementation, I hope, but more -an intrinsic property of the Burrows-Wheeler transform (unfortunately). -Maybe this isn't what you want. - -</P> -<P> -If you want a compressor and/or library which is faster, uses less -memory but gets pretty good compression, and has minimal latency, -consider Jean-loup -Gailly's and Mark Adler's work, <CODE>zlib-1.1.2</CODE> and -<CODE>gzip-1.2.4</CODE>. Look for them at - -</P> -<P> -<CODE>http://www.cdrom.com/pub/infozip/zlib</CODE> and -<CODE>http://www.gzip.org</CODE> respectively. - -</P> -<P> -For something faster and lighter still, you might try Markus F X J -Oberhumer's <CODE>LZO</CODE> real-time compression/decompression library, at -<BR> <CODE>http://wildsau.idv.uni-linz.ac.at/mfx/lzo.html</CODE>. - -</P> -<P> -If you want to use the <CODE>bzip2</CODE> algorithms to compress small blocks -of data, 64k bytes or smaller, for example on an on-the-fly disk -compressor, you'd be well advised not to use this library. Instead, -I've made a special library tuned for that kind of use. It's part of -<CODE>e2compr-0.40</CODE>, an on-the-fly disk compressor for the Linux -<CODE>ext2</CODE> filesystem. Look at -<CODE>http://www.netspace.net.au/~reiter/e2compr</CODE>. - -</P> - - - -<H2><A NAME="SEC48" HREF="manual_toc.html#TOC48">Testing</A></H2> - -<P> -A record of the tests I've done. - -</P> -<P> -First, some data sets: - -<UL> -<LI>B: a directory containing 6001 files, one for every length in the - - range 0 to 6000 bytes. The files contain random lowercase - letters. 18.7 megabytes. -<LI>H: my home directory tree. Documents, source code, mail files, - - compressed data. H contains B, and also a directory of - files designed as boundary cases for the sorting; mostly very - repetitive, nasty files. 565 megabytes. -<LI>A: directory tree holding various applications built from source: - - <CODE>egcs</CODE>, <CODE>gcc-2.8.1</CODE>, KDE, GTK, Octave, etc. - 2200 megabytes. -</UL> - -<P> -The tests conducted are as follows. Each test means compressing -(a copy of) each file in the data set, decompressing it and -comparing it against the original. - -</P> -<P> -First, a bunch of tests with block sizes and internal buffer -sizes set very small, -to detect any problems with the -blocking and buffering mechanisms. -This required modifying the source code so as to try to -break it. - -<OL> -<LI>Data set H, with - - buffer size of 1 byte, and block size of 23 bytes. -<LI>Data set B, buffer sizes 1 byte, block size 1 byte. - -<LI>As (2) but small-mode decompression. - -<LI>As (2) with block size 2 bytes. - -<LI>As (2) with block size 3 bytes. - -<LI>As (2) with block size 4 bytes. - -<LI>As (2) with block size 5 bytes. - -<LI>As (2) with block size 6 bytes and small-mode decompression. - -<LI>H with buffer size of 1 byte, but normal block - - size (up to 900000 bytes). -</OL> - -<P> -Then some tests with unmodified source code. - -<OL> -<LI>H, all settings normal. - -<LI>As (1), with small-mode decompress. - -<LI>H, compress with flag <CODE>-1</CODE>. - -<LI>H, compress with flag <CODE>-s</CODE>, decompress with flag <CODE>-s</CODE>. - -<LI>Forwards compatibility: H, <CODE>bzip2-0.1pl2</CODE> compressing, - - <CODE>bzip2-0.9.5</CODE> decompressing, all settings normal. -<LI>Backwards compatibility: H, <CODE>bzip2-0.9.5</CODE> compressing, - - <CODE>bzip2-0.1pl2</CODE> decompressing, all settings normal. -<LI>Bigger tests: A, all settings normal. - -<LI>As (7), using the fallback (Sadakane-like) sorting algorithm. - -<LI>As (8), compress with flag <CODE>-1</CODE>, decompress with flag - - <CODE>-s</CODE>. -<LI>H, using the fallback sorting algorithm. - -<LI>Forwards compatibility: A, <CODE>bzip2-0.1pl2</CODE> compressing, - - <CODE>bzip2-0.9.5</CODE> decompressing, all settings normal. -<LI>Backwards compatibility: A, <CODE>bzip2-0.9.5</CODE> compressing, - - <CODE>bzip2-0.1pl2</CODE> decompressing, all settings normal. -<LI>Misc test: about 400 megabytes of <CODE>.tar</CODE> files with - - <CODE>bzip2</CODE> compiled with Checker (a memory access error - detector, like Purify). -<LI>Misc tests to make sure it builds and runs ok on non-Linux/x86 - - platforms. -</OL> - -<P> -These tests were conducted on a 225 MHz IDT WinChip machine, running -Linux 2.0.36. They represent nearly a week of continuous computation. -All tests completed successfully. - -</P> - - - -<H2><A NAME="SEC49" HREF="manual_toc.html#TOC49">Further reading</A></H2> -<P> -<CODE>bzip2</CODE> is not research work, in the sense that it doesn't present -any new ideas. Rather, it's an engineering exercise based on existing -ideas. - -</P> -<P> -Four documents describe essentially all the ideas behind <CODE>bzip2</CODE>: - -<PRE> -Michael Burrows and D. J. Wheeler: - "A block-sorting lossless data compression algorithm" - 10th May 1994. - Digital SRC Research Report 124. - ftp://ftp.digital.com/pub/DEC/SRC/research-reports/SRC-124.ps.gz - If you have trouble finding it, try searching at the - New Zealand Digital Library, http://www.nzdl.org. - -Daniel S. Hirschberg and Debra A. LeLewer - "Efficient Decoding of Prefix Codes" - Communications of the ACM, April 1990, Vol 33, Number 4. - You might be able to get an electronic copy of this - from the ACM Digital Library. - -David J. Wheeler - Program bred3.c and accompanying document bred3.ps. - This contains the idea behind the multi-table Huffman - coding scheme. - ftp://ftp.cl.cam.ac.uk/users/djw3/ - -Jon L. Bentley and Robert Sedgewick - "Fast Algorithms for Sorting and Searching Strings" - Available from Sedgewick's web page, - www.cs.princeton.edu/~rs -</PRE> - -<P> -The following paper gives valuable additional insights into the -algorithm, but is not immediately the basis of any code -used in bzip2. - -<PRE> -Peter Fenwick: - Block Sorting Text Compression - Proceedings of the 19th Australasian Computer Science Conference, - Melbourne, Australia. Jan 31 - Feb 2, 1996. - ftp://ftp.cs.auckland.ac.nz/pub/peter-f/ACSC96paper.ps -</PRE> - -<P> -Kunihiko Sadakane's sorting algorithm, mentioned above, -is available from: - -<PRE> -http://naomi.is.s.u-tokyo.ac.jp/~sada/papers/Sada98b.ps.gz -</PRE> - -<P> -The Manber-Myers suffix array construction -algorithm is described in a paper -available from: - -<PRE> -http://www.cs.arizona.edu/people/gene/PAPERS/suffix.ps -</PRE> - -<P> -Finally, the following paper documents some recent investigations -I made into the performance of sorting algorithms: - -<PRE> -Julian Seward: - On the Performance of BWT Sorting Algorithms - Proceedings of the IEEE Data Compression Conference 2000 - Snowbird, Utah. 28-30 March 2000. -</PRE> - -<P><HR><P> -<p>Go to the <A HREF="manual_1.html">first</A>, <A HREF="manual_3.html">previous</A>, next, last section, <A HREF="manual_toc.html">table of contents</A>. -</BODY> -</HTML> diff --git a/winsup/bz2lib/manual_toc.html b/winsup/bz2lib/manual_toc.html deleted file mode 100644 index d4132c4..0000000 --- a/winsup/bz2lib/manual_toc.html +++ /dev/null @@ -1,173 +0,0 @@ -<HTML> -<HEAD> -<!-- This HTML file has been created by texi2html 1.54 - from manual.texi on 23 March 2000 --> - -<TITLE>bzip2 and libbzip2 - Table of Contents</TITLE> - -</HEAD> -<BODY> -<H1>bzip2 and libbzip2</H1> -<H2>a program and library for data compression</H2> -<H2>copyright (C) 1996-2000 Julian Seward</H2> -<H2>version 1.0 of 21 March 2000</H2> -<ADDRESS>Julian Seward</ADDRESS> -<P> -<P><HR><P> - -<P> -This program, <CODE>bzip2</CODE>, -and associated library <CODE>libbzip2</CODE>, are -Copyright (C) 1996-2000 Julian R Seward. All rights reserved. - -</P> -<P> -Redistribution and use in source and binary forms, with or without -modification, are permitted provided that the following conditions -are met: - -<UL> -<LI> - - Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. -<LI> - - The origin of this software must not be misrepresented; you must - not claim that you wrote the original software. If you use this - software in a product, an acknowledgment in the product - documentation would be appreciated but is not required. -<LI> - - Altered source versions must be plainly marked as such, and must - not be misrepresented as being the original software. -<LI> - - The name of the author may not be used to endorse or promote - products derived from this software without specific prior written - permission. -</UL> - -<P> -THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS -OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED -WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE -ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY -DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL -DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE -GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS -INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, -WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING -NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS -SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - -</P> -<P> -Julian Seward, Cambridge, UK. - -</P> -<P> -<CODE>jseward@acm.org</CODE> - -</P> -<P> -<CODE>http://sourceware.cygnus.com/bzip2</CODE> - -</P> -<P> -<CODE>http://www.cacheprof.org</CODE> - -</P> -<P> -<CODE>http://www.muraroa.demon.co.uk</CODE> - -</P> -<P> -<CODE>bzip2</CODE>/<CODE>libbzip2</CODE> version 1.0 of 21 March 2000. - -</P> -<P> -PATENTS: To the best of my knowledge, <CODE>bzip2</CODE> does not use any patented -algorithms. However, I do not have the resources available to carry out -a full patent search. Therefore I cannot give any guarantee of the -above statement. - -</P> - -<UL> -<LI><A NAME="TOC1" HREF="manual_1.html#SEC1">Introduction</A> -<LI><A NAME="TOC2" HREF="manual_2.html#SEC2">How to use <CODE>bzip2</CODE></A> -<UL> -<UL> -<UL> -<LI><A NAME="TOC3" HREF="manual_2.html#SEC3">NAME</A> -<LI><A NAME="TOC4" HREF="manual_2.html#SEC4">SYNOPSIS</A> -<LI><A NAME="TOC5" HREF="manual_2.html#SEC5">DESCRIPTION</A> -<LI><A NAME="TOC6" HREF="manual_2.html#SEC6">OPTIONS</A> -<LI><A NAME="TOC7" HREF="manual_2.html#SEC7">MEMORY MANAGEMENT</A> -<LI><A NAME="TOC8" HREF="manual_2.html#SEC8">RECOVERING DATA FROM DAMAGED FILES</A> -<LI><A NAME="TOC9" HREF="manual_2.html#SEC9">PERFORMANCE NOTES</A> -<LI><A NAME="TOC10" HREF="manual_2.html#SEC10">CAVEATS</A> -<LI><A NAME="TOC11" HREF="manual_2.html#SEC11">AUTHOR</A> -</UL> -</UL> -</UL> -<LI><A NAME="TOC12" HREF="manual_3.html#SEC12">Programming with <CODE>libbzip2</CODE></A> -<UL> -<LI><A NAME="TOC13" HREF="manual_3.html#SEC13">Top-level structure</A> -<UL> -<LI><A NAME="TOC14" HREF="manual_3.html#SEC14">Low-level summary</A> -<LI><A NAME="TOC15" HREF="manual_3.html#SEC15">High-level summary</A> -<LI><A NAME="TOC16" HREF="manual_3.html#SEC16">Utility functions summary</A> -</UL> -<LI><A NAME="TOC17" HREF="manual_3.html#SEC17">Error handling</A> -<LI><A NAME="TOC18" HREF="manual_3.html#SEC18">Low-level interface</A> -<UL> -<LI><A NAME="TOC19" HREF="manual_3.html#SEC19"><CODE>BZ2_bzCompressInit</CODE></A> -<LI><A NAME="TOC20" HREF="manual_3.html#SEC20"><CODE>BZ2_bzCompress</CODE></A> -<LI><A NAME="TOC21" HREF="manual_3.html#SEC21"><CODE>BZ2_bzCompressEnd</CODE></A> -<LI><A NAME="TOC22" HREF="manual_3.html#SEC22"><CODE>BZ2_bzDecompressInit</CODE></A> -<LI><A NAME="TOC23" HREF="manual_3.html#SEC23"><CODE>BZ2_bzDecompress</CODE></A> -<LI><A NAME="TOC24" HREF="manual_3.html#SEC24"><CODE>BZ2_bzDecompressEnd</CODE></A> -</UL> -<LI><A NAME="TOC25" HREF="manual_3.html#SEC25">High-level interface</A> -<UL> -<LI><A NAME="TOC26" HREF="manual_3.html#SEC26"><CODE>BZ2_bzReadOpen</CODE></A> -<LI><A NAME="TOC27" HREF="manual_3.html#SEC27"><CODE>BZ2_bzRead</CODE></A> -<LI><A NAME="TOC28" HREF="manual_3.html#SEC28"><CODE>BZ2_bzReadGetUnused</CODE></A> -<LI><A NAME="TOC29" HREF="manual_3.html#SEC29"><CODE>BZ2_bzReadClose</CODE></A> -<LI><A NAME="TOC30" HREF="manual_3.html#SEC30"><CODE>BZ2_bzWriteOpen</CODE></A> -<LI><A NAME="TOC31" HREF="manual_3.html#SEC31"><CODE>BZ2_bzWrite</CODE></A> -<LI><A NAME="TOC32" HREF="manual_3.html#SEC32"><CODE>BZ2_bzWriteClose</CODE></A> -<LI><A NAME="TOC33" HREF="manual_3.html#SEC33">Handling embedded compressed data streams</A> -<LI><A NAME="TOC34" HREF="manual_3.html#SEC34">Standard file-reading/writing code</A> -</UL> -<LI><A NAME="TOC35" HREF="manual_3.html#SEC35">Utility functions</A> -<UL> -<LI><A NAME="TOC36" HREF="manual_3.html#SEC36"><CODE>BZ2_bzBuffToBuffCompress</CODE></A> -<LI><A NAME="TOC37" HREF="manual_3.html#SEC37"><CODE>BZ2_bzBuffToBuffDecompress</CODE></A> -</UL> -<LI><A NAME="TOC38" HREF="manual_3.html#SEC38"><CODE>zlib</CODE> compatibility functions</A> -<LI><A NAME="TOC39" HREF="manual_3.html#SEC39">Using the library in a <CODE>stdio</CODE>-free environment</A> -<UL> -<LI><A NAME="TOC40" HREF="manual_3.html#SEC40">Getting rid of <CODE>stdio</CODE></A> -<LI><A NAME="TOC41" HREF="manual_3.html#SEC41">Critical error handling</A> -</UL> -<LI><A NAME="TOC42" HREF="manual_3.html#SEC42">Making a Windows DLL</A> -</UL> -<LI><A NAME="TOC43" HREF="manual_4.html#SEC43">Miscellanea</A> -<UL> -<LI><A NAME="TOC44" HREF="manual_4.html#SEC44">Limitations of the compressed file format</A> -<LI><A NAME="TOC45" HREF="manual_4.html#SEC45">Portability issues</A> -<LI><A NAME="TOC46" HREF="manual_4.html#SEC46">Reporting bugs</A> -<LI><A NAME="TOC47" HREF="manual_4.html#SEC47">Did you get the right package?</A> -<LI><A NAME="TOC48" HREF="manual_4.html#SEC48">Testing</A> -<LI><A NAME="TOC49" HREF="manual_4.html#SEC49">Further reading</A> -</UL> -</UL> -<P><HR><P> -This document was generated on 23 March 2000 using the -<A HREF="http://wwwcn.cern.ch/dci/texi2html/">texi2html</A> -translator version 1.51a.</P> -</BODY> -</HTML> diff --git a/winsup/bz2lib/randtable.c b/winsup/bz2lib/randtable.c deleted file mode 100644 index 983089d..0000000 --- a/winsup/bz2lib/randtable.c +++ /dev/null @@ -1,124 +0,0 @@ - -/*-------------------------------------------------------------*/ -/*--- Table for randomising repetitive blocks ---*/ -/*--- randtable.c ---*/ -/*-------------------------------------------------------------*/ - -/*-- - This file is a part of bzip2 and/or libbzip2, a program and - library for lossless, block-sorting data compression. - - Copyright (C) 1996-2000 Julian R Seward. All rights reserved. - - Redistribution and use in source and binary forms, with or without - modification, are permitted provided that the following conditions - are met: - - 1. Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - - 2. The origin of this software must not be misrepresented; you must - not claim that you wrote the original software. If you use this - software in a product, an acknowledgment in the product - documentation would be appreciated but is not required. - - 3. Altered source versions must be plainly marked as such, and must - not be misrepresented as being the original software. - - 4. The name of the author may not be used to endorse or promote - products derived from this software without specific prior written - permission. - - THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS - OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED - WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY - DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE - GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS - INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, - WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING - NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS - SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - - Julian Seward, Cambridge, UK. - jseward@acm.org - bzip2/libbzip2 version 1.0 of 21 March 2000 - - This program is based on (at least) the work of: - Mike Burrows - David Wheeler - Peter Fenwick - Alistair Moffat - Radford Neal - Ian H. Witten - Robert Sedgewick - Jon L. Bentley - - For more information on these sources, see the manual. ---*/ - - -#include "bzlib_private.h" - - -/*---------------------------------------------*/ -Int32 BZ2_rNums[512] = { - 619, 720, 127, 481, 931, 816, 813, 233, 566, 247, - 985, 724, 205, 454, 863, 491, 741, 242, 949, 214, - 733, 859, 335, 708, 621, 574, 73, 654, 730, 472, - 419, 436, 278, 496, 867, 210, 399, 680, 480, 51, - 878, 465, 811, 169, 869, 675, 611, 697, 867, 561, - 862, 687, 507, 283, 482, 129, 807, 591, 733, 623, - 150, 238, 59, 379, 684, 877, 625, 169, 643, 105, - 170, 607, 520, 932, 727, 476, 693, 425, 174, 647, - 73, 122, 335, 530, 442, 853, 695, 249, 445, 515, - 909, 545, 703, 919, 874, 474, 882, 500, 594, 612, - 641, 801, 220, 162, 819, 984, 589, 513, 495, 799, - 161, 604, 958, 533, 221, 400, 386, 867, 600, 782, - 382, 596, 414, 171, 516, 375, 682, 485, 911, 276, - 98, 553, 163, 354, 666, 933, 424, 341, 533, 870, - 227, 730, 475, 186, 263, 647, 537, 686, 600, 224, - 469, 68, 770, 919, 190, 373, 294, 822, 808, 206, - 184, 943, 795, 384, 383, 461, 404, 758, 839, 887, - 715, 67, 618, 276, 204, 918, 873, 777, 604, 560, - 951, 160, 578, 722, 79, 804, 96, 409, 713, 940, - 652, 934, 970, 447, 318, 353, 859, 672, 112, 785, - 645, 863, 803, 350, 139, 93, 354, 99, 820, 908, - 609, 772, 154, 274, 580, 184, 79, 626, 630, 742, - 653, 282, 762, 623, 680, 81, 927, 626, 789, 125, - 411, 521, 938, 300, 821, 78, 343, 175, 128, 250, - 170, 774, 972, 275, 999, 639, 495, 78, 352, 126, - 857, 956, 358, 619, 580, 124, 737, 594, 701, 612, - 669, 112, 134, 694, 363, 992, 809, 743, 168, 974, - 944, 375, 748, 52, 600, 747, 642, 182, 862, 81, - 344, 805, 988, 739, 511, 655, 814, 334, 249, 515, - 897, 955, 664, 981, 649, 113, 974, 459, 893, 228, - 433, 837, 553, 268, 926, 240, 102, 654, 459, 51, - 686, 754, 806, 760, 493, 403, 415, 394, 687, 700, - 946, 670, 656, 610, 738, 392, 760, 799, 887, 653, - 978, 321, 576, 617, 626, 502, 894, 679, 243, 440, - 680, 879, 194, 572, 640, 724, 926, 56, 204, 700, - 707, 151, 457, 449, 797, 195, 791, 558, 945, 679, - 297, 59, 87, 824, 713, 663, 412, 693, 342, 606, - 134, 108, 571, 364, 631, 212, 174, 643, 304, 329, - 343, 97, 430, 751, 497, 314, 983, 374, 822, 928, - 140, 206, 73, 263, 980, 736, 876, 478, 430, 305, - 170, 514, 364, 692, 829, 82, 855, 953, 676, 246, - 369, 970, 294, 750, 807, 827, 150, 790, 288, 923, - 804, 378, 215, 828, 592, 281, 565, 555, 710, 82, - 896, 831, 547, 261, 524, 462, 293, 465, 502, 56, - 661, 821, 976, 991, 658, 869, 905, 758, 745, 193, - 768, 550, 608, 933, 378, 286, 215, 979, 792, 961, - 61, 688, 793, 644, 986, 403, 106, 366, 905, 644, - 372, 567, 466, 434, 645, 210, 389, 550, 919, 135, - 780, 773, 635, 389, 707, 100, 626, 958, 165, 504, - 920, 176, 193, 713, 857, 265, 203, 50, 668, 108, - 645, 990, 626, 197, 510, 357, 358, 850, 858, 364, - 936, 638 -}; - - -/*-------------------------------------------------------------*/ -/*--- end randtable.c ---*/ -/*-------------------------------------------------------------*/ diff --git a/winsup/bz2lib/sample1.bz2 b/winsup/bz2lib/sample1.bz2 Binary files differdeleted file mode 100644 index 18dea60..0000000 --- a/winsup/bz2lib/sample1.bz2 +++ /dev/null diff --git a/winsup/bz2lib/sample1.ref b/winsup/bz2lib/sample1.ref Binary files differdeleted file mode 100644 index a56e52b..0000000 --- a/winsup/bz2lib/sample1.ref +++ /dev/null diff --git a/winsup/bz2lib/sample2.bz2 b/winsup/bz2lib/sample2.bz2 Binary files differdeleted file mode 100644 index d5a6160..0000000 --- a/winsup/bz2lib/sample2.bz2 +++ /dev/null diff --git a/winsup/bz2lib/sample2.ref b/winsup/bz2lib/sample2.ref Binary files differdeleted file mode 100644 index 34af958..0000000 --- a/winsup/bz2lib/sample2.ref +++ /dev/null diff --git a/winsup/bz2lib/sample3.bz2 b/winsup/bz2lib/sample3.bz2 Binary files differdeleted file mode 100644 index d90cff9..0000000 --- a/winsup/bz2lib/sample3.bz2 +++ /dev/null diff --git a/winsup/bz2lib/sample3.ref b/winsup/bz2lib/sample3.ref deleted file mode 100644 index 775a2f6..0000000 --- a/winsup/bz2lib/sample3.ref +++ /dev/null @@ -1,30007 +0,0 @@ -This file is exceedingly boring. If you find yourself -reading it, please (1) take it from me that you can safely -guess what the rest of the file says, and (2) seek professional -help. - -ps. there are no further sarcastic remarks in this file. - -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh 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-ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh 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-ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh -ugh diff --git a/winsup/bz2lib/spewG.c b/winsup/bz2lib/spewG.c deleted file mode 100644 index 7934e76..0000000 --- a/winsup/bz2lib/spewG.c +++ /dev/null @@ -1,39 +0,0 @@ - -/* spew out a thoroughly gigantic file designed so that bzip2 - can compress it reasonably rapidly. This is to help test - support for large files (> 2GB) in a reasonable amount of time. - I suggest you use the undocumented --exponential option to - bzip2 when compressing the resulting file; this saves a bit of - time. Note: *don't* bother with --exponential when compressing - Real Files; it'll just waste a lot of CPU time :-) - (but is otherwise harmless). -*/ - -#define _FILE_OFFSET_BITS 64 - -#include <stdio.h> -#include <stdlib.h> - -/* The number of megabytes of junk to spew out (roughly) */ -#define MEGABYTES 5000 - -#define N_BUF 1000000 -char buf[N_BUF]; - -int main ( int argc, char** argv ) -{ - int ii, kk, p; - srandom(1); - setbuffer ( stdout, buf, N_BUF ); - for (kk = 0; kk < MEGABYTES * 515; kk+=3) { - p = 25+random()%50; - for (ii = 0; ii < p; ii++) - printf ( "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" ); - for (ii = 0; ii < p-1; ii++) - printf ( "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb" ); - for (ii = 0; ii < p+1; ii++) - printf ( "ccccccccccccccccccccccccccccccccccccc" ); - } - fflush(stdout); - return 0; -} diff --git a/winsup/bz2lib/unzcrash.c b/winsup/bz2lib/unzcrash.c deleted file mode 100644 index f0f17fc..0000000 --- a/winsup/bz2lib/unzcrash.c +++ /dev/null @@ -1,126 +0,0 @@ - -/* A test program written to test robustness to decompression of - corrupted data. Usage is - unzcrash filename - and the program will read the specified file, compress it (in memory), - and then repeatedly decompress it, each time with a different bit of - the compressed data inverted, so as to test all possible one-bit errors. - This should not cause any invalid memory accesses. If it does, - I want to know about it! - - p.s. As you can see from the above description, the process is - incredibly slow. A file of size eg 5KB will cause it to run for - many hours. -*/ - -#include <stdio.h> -#include <assert.h> -#include "bzlib.h" - -#define M_BLOCK 1000000 - -typedef unsigned char uchar; - -#define M_BLOCK_OUT (M_BLOCK + 1000000) -uchar inbuf[M_BLOCK]; -uchar outbuf[M_BLOCK_OUT]; -uchar zbuf[M_BLOCK + 600 + (M_BLOCK / 100)]; - -int nIn, nOut, nZ; - -static char *bzerrorstrings[] = { - "OK" - ,"SEQUENCE_ERROR" - ,"PARAM_ERROR" - ,"MEM_ERROR" - ,"DATA_ERROR" - ,"DATA_ERROR_MAGIC" - ,"IO_ERROR" - ,"UNEXPECTED_EOF" - ,"OUTBUFF_FULL" - ,"???" /* for future */ - ,"???" /* for future */ - ,"???" /* for future */ - ,"???" /* for future */ - ,"???" /* for future */ - ,"???" /* for future */ -}; - -void flip_bit ( int bit ) -{ - int byteno = bit / 8; - int bitno = bit % 8; - uchar mask = 1 << bitno; - //fprintf ( stderr, "(byte %d bit %d mask %d)", - // byteno, bitno, (int)mask ); - zbuf[byteno] ^= mask; -} - -int main ( int argc, char** argv ) -{ - FILE* f; - int r; - int bit; - int i; - - if (argc != 2) { - fprintf ( stderr, "usage: unzcrash filename\n" ); - return 1; - } - - f = fopen ( argv[1], "r" ); - if (!f) { - fprintf ( stderr, "unzcrash: can't open %s\n", argv[1] ); - return 1; - } - - nIn = fread ( inbuf, 1, M_BLOCK, f ); - fprintf ( stderr, "%d bytes read\n", nIn ); - - nZ = M_BLOCK; - r = BZ2_bzBuffToBuffCompress ( - zbuf, &nZ, inbuf, nIn, 9, 0, 30 ); - - assert (r == BZ_OK); - fprintf ( stderr, "%d after compression\n", nZ ); - - for (bit = 0; bit < nZ*8; bit++) { - fprintf ( stderr, "bit %d ", bit ); - flip_bit ( bit ); - nOut = M_BLOCK_OUT; - r = BZ2_bzBuffToBuffDecompress ( - outbuf, &nOut, zbuf, nZ, 0, 0 ); - fprintf ( stderr, " %d %s ", r, bzerrorstrings[-r] ); - - if (r != BZ_OK) { - fprintf ( stderr, "\n" ); - } else { - if (nOut != nIn) { - fprintf(stderr, "nIn/nOut mismatch %d %d\n", nIn, nOut ); - return 1; - } else { - for (i = 0; i < nOut; i++) - if (inbuf[i] != outbuf[i]) { - fprintf(stderr, "mismatch at %d\n", i ); - return 1; - } - if (i == nOut) fprintf(stderr, "really ok!\n" ); - } - } - - flip_bit ( bit ); - } - -#if 0 - assert (nOut == nIn); - for (i = 0; i < nOut; i++) { - if (inbuf[i] != outbuf[i]) { - fprintf ( stderr, "difference at %d !\n", i ); - return 1; - } - } -#endif - - fprintf ( stderr, "all ok\n" ); - return 0; -} diff --git a/winsup/bz2lib/words0 b/winsup/bz2lib/words0 deleted file mode 100644 index 164a8ed..0000000 --- a/winsup/bz2lib/words0 +++ /dev/null @@ -1,5 +0,0 @@ - -If compilation produces errors, or a large number of warnings, -please read README.COMPILATION.PROBLEMS -- you might be able to -adjust the flags in this Makefile to improve matters. - diff --git a/winsup/bz2lib/words1 b/winsup/bz2lib/words1 deleted file mode 100644 index 2e83de9..0000000 --- a/winsup/bz2lib/words1 +++ /dev/null @@ -1,4 +0,0 @@ - -Doing 6 tests (3 compress, 3 uncompress) ... -If there's a problem, things might stop at this point. - diff --git a/winsup/bz2lib/words2 b/winsup/bz2lib/words2 deleted file mode 100644 index 203ee39..0000000 --- a/winsup/bz2lib/words2 +++ /dev/null @@ -1,5 +0,0 @@ - -Checking test results. If any of the four "cmp"s which follow -report any differences, something is wrong. If you can't easily -figure out what, please let me know (jseward@acm.org). - diff --git a/winsup/bz2lib/words3 b/winsup/bz2lib/words3 deleted file mode 100644 index 8486a84..0000000 --- a/winsup/bz2lib/words3 +++ /dev/null @@ -1,23 +0,0 @@ - -If you got this far and the "cmp"s didn't complain, it looks -like you're in business. - -To install in /usr/bin, /usr/lib, /usr/man and /usr/include, type - make install -To install somewhere else, eg, /xxx/yyy/{bin,lib,man,include}, type - make install PREFIX=/xxx/yyy -If you are (justifiably) paranoid and want to see what 'make install' -is going to do, you can first do - make -n install or - make -n install PREFIX=/xxx/yyy respectively. -The -n instructs make to show the commands it would execute, but -not actually execute them. - -Instructions for use are in the preformatted manual page, in the file -bzip2.txt. For more detailed documentation, read the full manual. -It is available in Postscript form (manual.ps) and HTML form -(manual_toc.html). - -You can also do "bzip2 --help" to see some helpful information. -"bzip2 -L" displays the software license. - |