greg/pcompress
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

Fix huge chunk handling in zlib compression routines.

Browse source 
Fix Zlib error messages.
Remove extra variable in Bzip2 decompress routine.
This commit is contained in:
Moinak Ghosh 2012-07-27 00:11:01 +05:30
parent b586d30359
commit 9c3423530c
2 changed files with 102 additions and 31 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
bzip2_compress.c
View file

@ -159,7 +159,7 @@ bzip2_decompress(void *src, size_t srclen, void *dst, size_t *dstlen,
int level, uchar_t chdr, void *data)
{
bz_stream bzs;
int ret, ending;
int ret;
unsigned int slen, dlen;
size_t _srclen = srclen;
size_t _dstlen = *dstlen;
@ -181,7 +181,6 @@ bzip2_decompress(void *src, size_t srclen, void *dst, size_t *dstlen,
slen = SINGLE_CALL_MAX;
} else {
slen = _srclen;
ending = 1;
}
if (_dstlen > SINGLE_CALL_MAX) {
dlen = SINGLE_CALL_MAX;

112
zlib_compress.c
View file

@ -29,6 +29,11 @@
#include <pcompress.h>
#include <allocator.h>
/*
* Max buffer size allowed for a single zlib compress/decompress call.
*/
#define SINGLE_CALL_MAX (2147483648UL)
static void *
slab_alloc_ui(void *p, unsigned int items, unsigned int size) {
void *ptr;
@ -58,7 +63,7 @@ void zerr(int ret)
perror(" ");
break;
case Z_STREAM_ERROR:
fprintf(stderr, "Zlib: Invalid compression level\n");
fprintf(stderr, "Zlib: Invalid stream structure\n");
break;
case Z_DATA_ERROR:
fprintf(stderr, "Zlib: Invalid or incomplete deflate data\n");
@ -69,6 +74,12 @@ void zerr(int ret)
case Z_VERSION_ERROR:
fprintf(stderr, "Zlib: Version mismatch!\n");
break;
case Z_BUF_ERROR:
fprintf(stderr, "Zlib: Buffer error decompression failed.\n");
break;
case Z_NEED_DICT:
fprintf(stderr, "Zlib: Need present dictionary.\n");
break;
default:
fprintf(stderr, "Zlib: Unknown error code: %d\n", ret);
}
@ -79,12 +90,12 @@ zlib_compress(void *src, size_t srclen, void *dst, size_t *dstlen,
int level, uchar_t chdr, void *data)
{
z_stream zs;
int ret;
zs.next_in = src;
zs.avail_in = srclen;
zs.next_out = dst;
zs.avail_out = *dstlen;
int ret, ending;
unsigned int slen, dlen;
size_t _srclen = srclen;
size_t _dstlen = *dstlen;
uchar_t *dst1 = dst;
uchar_t *src1 = src;
zs.zalloc = slab_alloc_ui;
zs.zfree = slab_free;
@ -96,6 +107,32 @@ zlib_compress(void *src, size_t srclen, void *dst, size_t *dstlen,
return (-1);
}
ending = 0;
while (_srclen > 0) {
if (_srclen > SINGLE_CALL_MAX) {
slen = SINGLE_CALL_MAX;
} else {
slen = _srclen;
ending = 1;
}
if (_dstlen > SINGLE_CALL_MAX) {
dlen = SINGLE_CALL_MAX;
} else {
dlen = _dstlen;
}
zs.next_in = src1;
zs.avail_in = slen;
zs.next_out = dst1;
zs.avail_out = dlen;
if (!ending) {
ret = deflate(&zs, Z_NO_FLUSH);
if (ret != Z_OK) {
deflateEnd(&zs);
zerr(ret);
return (-1);
}
} else {
ret = deflate(&zs, Z_FINISH);
if (ret != Z_STREAM_END) {
deflateEnd(&zs);
@ -105,7 +142,14 @@ zlib_compress(void *src, size_t srclen, void *dst, size_t *dstlen,
zerr(ret);
return (-1);
}
*dstlen = zs.total_out;
}
dst1 += (dlen - zs.avail_out);
_dstlen -= (dlen - zs.avail_out);
src1 += slen;
_srclen -= slen;
}
*dstlen = *dstlen - _dstlen;
ret = deflateEnd(&zs);
if (ret != Z_OK) {
zerr(ret);
@ -120,12 +164,11 @@ zlib_decompress(void *src, size_t srclen, void *dst, size_t *dstlen,
{
z_stream zs;
int err;
bzero(&zs, sizeof (zs));
zs.next_in = (unsigned char *)src;
zs.avail_in = srclen;
zs.next_out = dst;
zs.avail_out = *dstlen;
unsigned int slen, dlen;
size_t _srclen = srclen;
size_t _dstlen = *dstlen;
uchar_t *dst1 = dst;
uchar_t *src1 = src;
zs.zalloc = slab_alloc_ui;
zs.zfree = slab_free;
@ -136,16 +179,45 @@ zlib_decompress(void *src, size_t srclen, void *dst, size_t *dstlen,
return (-1);
}
if ((err = inflate(&zs, Z_FINISH)) != Z_STREAM_END) {
inflateEnd(&zs);
if (err == Z_OK)
zerr(Z_BUF_ERROR);
else
while (_srclen > 0) {
if (_srclen > SINGLE_CALL_MAX) {
slen = SINGLE_CALL_MAX;
} else {
slen = _srclen;
}
if (_dstlen > SINGLE_CALL_MAX) {
dlen = SINGLE_CALL_MAX;
} else {
dlen = _dstlen;
}
zs.next_in = src1;
zs.avail_in = slen;
zs.next_out = dst1;
zs.avail_out = dlen;
err = inflate(&zs, Z_NO_FLUSH);
if (err != Z_OK && err != Z_STREAM_END) {
zerr(err);
return (-1);
}
*dstlen = zs.total_out;
dst1 += (dlen - zs.avail_out);
_dstlen -= (dlen - zs.avail_out);
src1 += (slen - zs.avail_in);
_srclen -= (slen - zs.avail_in);
if (err == Z_STREAM_END) {
if (_srclen > 0) {
zerr(Z_DATA_ERROR);
return (-1);
} else {
break;
}
}
}
*dstlen = _dstlen;
inflateEnd(&zs);
return (0);
}