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/*
* Jim - zlib bindings
*
* Copyright 2015, 2016 Dima Krasner <dima@dimakrasner.com>
*
* 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. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE JIM TCL PROJECT ``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
* JIM TCL PROJECT OR CONTRIBUTORS 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.
*
* The views and conclusions contained in the software and documentation
* are those of the authors and should not be interpreted as representing
* official policies, either expressed or implied, of the Jim Tcl Project.
*/
#include <zlib.h>
#include <jim.h>
#include <jim-subcmd.h>
#define _PASTE(x) # x
#define PASTE(x) _PASTE(x)
#define WBITS_GZIP (MAX_WBITS | 16)
/* use small 64K chunks if no size was specified during decompression, to reduce memory consumption */
#define DEF_DECOMPRESS_BUFSIZ (64 * 1024)
static int Jim_Crc32(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
{
long init;
const char *in;
int len;
if (argc == 1) {
init = crc32(0L, Z_NULL, 0);
} else {
if (Jim_GetLong(interp, argv[1], &init) != JIM_OK) {
return JIM_ERR;
}
}
in = Jim_GetString(argv[0], &len);
Jim_SetResultInt(interp, crc32((uLong)init, (const Bytef *)in, (uInt)len) & 0xFFFFFFFF);
return JIM_OK;
}
static int Jim_Compress(Jim_Interp *interp, const char *in, int len, long level, int wbits)
{
z_stream strm = {0};
Bytef *buf;
if ((level != Z_DEFAULT_COMPRESSION) && ((level < Z_NO_COMPRESSION) || (level > Z_BEST_COMPRESSION))) {
Jim_SetResultString(interp, "level must be 0 to 9", -1);
return JIM_ERR;
}
if (deflateInit2(&strm, level, Z_DEFLATED, wbits, MAX_MEM_LEVEL, Z_DEFAULT_STRATEGY) != Z_OK) {
return JIM_ERR;
}
strm.avail_out = deflateBound(&strm, (uLong)len);
if (strm.avail_out > INT_MAX) {
deflateEnd(&strm);
return JIM_ERR;
}
buf = (Bytef *)Jim_Alloc((int)strm.avail_out);
strm.next_out = buf;
strm.next_in = (Bytef *)in;
strm.avail_in = (uInt)len;
/* always compress in one pass - the return value holds the entire
* decompressed data anyway, so there's no reason to do chunked
* decompression */
if (deflate(&strm, Z_FINISH) != Z_STREAM_END) {
Jim_Free(strm.next_out);
deflateEnd(&strm);
return JIM_ERR;
}
deflateEnd(&strm);
if (strm.total_out > INT_MAX) {
Jim_Free(strm.next_out);
return JIM_ERR;
}
Jim_SetResult(interp, Jim_NewStringObjNoAlloc(interp, (char *)buf, (int)strm.total_out));
return JIM_OK;
}
static int Jim_Deflate(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
{
long level = Z_DEFAULT_COMPRESSION;
const char *in;
int len;
if (argc != 1) {
if (Jim_GetLong(interp, argv[1], &level) != JIM_OK) {
return JIM_ERR;
}
}
in = Jim_GetString(argv[0], &len);
return Jim_Compress(interp, in, len, level, -MAX_WBITS);
}
static int Jim_Gzip(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
{
long level = Z_DEFAULT_COMPRESSION;
const char *in;
int len;
if (argc == 3) {
if (!Jim_CompareStringImmediate(interp, argv[1], "-level")) {
return -1;
}
if (Jim_GetLong(interp, argv[2], &level) != JIM_OK) {
return -1;
}
}
else if (argc != 1) {
return -1;
}
in = Jim_GetString(argv[0], &len);
return Jim_Compress(interp, in, len, level, WBITS_GZIP);
}
static int Jim_Decompress(Jim_Interp *interp, const char *in, int len, long bufsiz, int wbits)
{
z_stream strm = {0};
void *buf;
Jim_Obj *out;
int ret;
if ((bufsiz <= 0) || (bufsiz > INT_MAX)) {
Jim_SetResultString(interp, "buffer size must be 0 to "PASTE(INT_MAX), -1);
return JIM_ERR;
}
if (inflateInit2(&strm, wbits) != Z_OK) {
return JIM_ERR;
}
/* allocate a buffer - decompression is done in chunks, into this buffer;
* when the decompressed data size is given, decompression is faster because
* it's done in one pass, with less memcpy() overhead */
buf = Jim_Alloc((int)bufsiz);
out = Jim_NewEmptyStringObj(interp);
Jim_IncrRefCount(out);
strm.next_in = (Bytef*)in;
strm.avail_in = (uInt)len;
do {
do {
strm.next_out = buf;
strm.avail_out = (uInt)bufsiz;
ret = inflate(&strm, Z_NO_FLUSH);
switch (ret) {
case Z_OK:
case Z_STREAM_END:
/* append each chunk to the output object */
Jim_AppendString(interp, out, buf, (int)(bufsiz - (long)strm.avail_out));
break;
default:
Jim_DecrRefCount(interp, out);
Jim_Free(buf);
inflateEnd(&strm);
if (strm.msg != NULL)
Jim_SetResultString(interp, strm.msg, -1);
return JIM_ERR;
}
} while (strm.avail_out == 0);
} while (ret != Z_STREAM_END);
/* free memory used for decompression before we assign the return value */
Jim_Free(buf);
inflateEnd(&strm);
Jim_SetResult(interp, out);
Jim_DecrRefCount(interp, out);
return JIM_OK;
}
static int Jim_Inflate(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
{
long bufsiz = DEF_DECOMPRESS_BUFSIZ;
const char *in;
int len;
if (argc != 1) {
if (Jim_GetLong(interp, argv[1], &bufsiz) != JIM_OK) {
return JIM_ERR;
}
if ((bufsiz <= 0) || (bufsiz > INT_MAX)) {
Jim_SetResultString(interp, "buffer size must be 0 to "PASTE(INT_MAX), -1);
return JIM_ERR;
}
}
in = Jim_GetString(argv[0], &len);
return Jim_Decompress(interp, in, len, bufsiz, -MAX_WBITS);
}
static int Jim_Gunzip(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
{
long bufsiz = DEF_DECOMPRESS_BUFSIZ;
const char *in;
int len;
if (argc == 3) {
if (!Jim_CompareStringImmediate(interp, argv[1], "-buffersize")) {
return -1;
}
if (Jim_GetLong(interp, argv[2], &bufsiz) != JIM_OK) {
return -1;
}
}
else if (argc != 1) {
return -1;
}
in = Jim_GetString(argv[0], &len);
return Jim_Decompress(interp, in, len, bufsiz, WBITS_GZIP);
}
static const jim_subcmd_type zlib_command_table[] = {
{ "crc32",
"data ?startValue?",
Jim_Crc32,
1,
2,
/* Description: Calculates the CRC32 checksum of a string */
},
{ "deflate",
"string ?level?",
Jim_Deflate,
1,
2,
/* Description: Compresses a string and outputs a raw, zlib-compressed stream */
},
{ "gzip",
"data ?-level level?",
Jim_Gzip,
1,
3,
/* Description: Compresses a string and outputs a gzip-compressed stream */
},
{ "inflate",
"data ?bufferSize?",
Jim_Inflate,
1,
2,
/* Description: Decompresses a raw, zlib-compressed stream */
},
{ "gunzip",
"data ?-buffersize size?",
Jim_Gunzip,
1,
3,
/* Description: Decompresses a gzip-compressed stream */
},
{ NULL }
};
static int JimZlibCmd(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
{
return Jim_CallSubCmd(interp, Jim_ParseSubCmd(interp, zlib_command_table, argc, argv), argc, argv);
}
int Jim_zlibInit(Jim_Interp *interp)
{
if (Jim_PackageProvide(interp, "zlib", "1.0", JIM_ERRMSG)) {
return JIM_ERR;
}
Jim_CreateCommand(interp, "zlib", JimZlibCmd, 0, 0);
return JIM_OK;
}
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