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author | Tom Tromey <tromey@gcc.gnu.org> | 1999-05-04 19:30:25 +0000 |
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committer | Tom Tromey <tromey@gcc.gnu.org> | 1999-05-04 19:30:25 +0000 |
commit | c45f211ee347bc648b183c5123498c5b7310bb0e (patch) | |
tree | e97105783ac15ce06e3efe366d641f3693aa8974 /zlib/infutil.c | |
parent | 3d298f8f0e3934f7951b13281976bb9eda021387 (diff) | |
download | gcc-c45f211ee347bc648b183c5123498c5b7310bb0e.zip gcc-c45f211ee347bc648b183c5123498c5b7310bb0e.tar.gz gcc-c45f211ee347bc648b183c5123498c5b7310bb0e.tar.bz2 |
Initial revision
From-SVN: r26770
Diffstat (limited to 'zlib/infutil.c')
-rw-r--r-- | zlib/infutil.c | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/zlib/infutil.c b/zlib/infutil.c new file mode 100644 index 0000000..824dab5 --- /dev/null +++ b/zlib/infutil.c @@ -0,0 +1,87 @@ +/* inflate_util.c -- data and routines common to blocks and codes + * Copyright (C) 1995-1998 Mark Adler + * For conditions of distribution and use, see copyright notice in zlib.h + */ + +#include "zutil.h" +#include "infblock.h" +#include "inftrees.h" +#include "infcodes.h" +#include "infutil.h" + +struct inflate_codes_state {int dummy;}; /* for buggy compilers */ + +/* And'ing with mask[n] masks the lower n bits */ +uInt inflate_mask[17] = { + 0x0000, + 0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f, 0x007f, 0x00ff, + 0x01ff, 0x03ff, 0x07ff, 0x0fff, 0x1fff, 0x3fff, 0x7fff, 0xffff +}; + + +/* copy as much as possible from the sliding window to the output area */ +int inflate_flush(s, z, r) +inflate_blocks_statef *s; +z_streamp z; +int r; +{ + uInt n; + Bytef *p; + Bytef *q; + + /* local copies of source and destination pointers */ + p = z->next_out; + q = s->read; + + /* compute number of bytes to copy as far as end of window */ + n = (uInt)((q <= s->write ? s->write : s->end) - q); + if (n > z->avail_out) n = z->avail_out; + if (n && r == Z_BUF_ERROR) r = Z_OK; + + /* update counters */ + z->avail_out -= n; + z->total_out += n; + + /* update check information */ + if (s->checkfn != Z_NULL) + z->adler = s->check = (*s->checkfn)(s->check, q, n); + + /* copy as far as end of window */ + zmemcpy(p, q, n); + p += n; + q += n; + + /* see if more to copy at beginning of window */ + if (q == s->end) + { + /* wrap pointers */ + q = s->window; + if (s->write == s->end) + s->write = s->window; + + /* compute bytes to copy */ + n = (uInt)(s->write - q); + if (n > z->avail_out) n = z->avail_out; + if (n && r == Z_BUF_ERROR) r = Z_OK; + + /* update counters */ + z->avail_out -= n; + z->total_out += n; + + /* update check information */ + if (s->checkfn != Z_NULL) + z->adler = s->check = (*s->checkfn)(s->check, q, n); + + /* copy */ + zmemcpy(p, q, n); + p += n; + q += n; + } + + /* update pointers */ + z->next_out = p; + s->read = q; + + /* done */ + return r; +} |