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zlib 0.99

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This commit is contained in:
Mark Adler
2011-09-09 23:11:37 -07:00
parent 25e5325501
commit 56bcb184fa
33 changed files with 1833 additions and 775 deletions
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322
example.c
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@@ -1,5 +1,5 @@
/* example.c -- usage example of the zlib compression library
* Copyright (C) 1995 Jean-loup Gailly.
* Copyright (C) 1995-1996 Jean-loup Gailly.
* For conditions of distribution and use, see copyright notice in zlib.h
*/
@@ -10,20 +10,11 @@
#ifdef STDC
# include <string.h>
# include <stdlib.h>
#else
extern void exit OF((int));
#endif
#ifndef __GO32__
extern void exit OF((int));
#endif
#define BUFLEN 4096
#define local static
/* For MSDOS and other systems with limitation on stack size. For Unix,
#define local
works also.
*/
#define CHECK_ERR(err, msg) { \
if (err != Z_OK) { \
fprintf(stderr, "%s error: %d\n", msg, err); \
@@ -31,32 +22,44 @@ extern void exit OF((int));
} \
}
char *hello = "hello, hello!";
const char hello[] = "hello, hello!";
/* "hello world" would be more standard, but the repeated "hello"
* stresses the compression code better, sorry...
*/
void test_compress OF((void));
void test_gzio OF((char *out, char *in));
void test_deflate OF((Byte compr[]));
void test_inflate OF((Byte compr[]));
void test_flush OF((Byte compr[]));
void test_sync OF((Byte compr[]));
int main OF((int argc, char *argv[]));
const char dictionary[] = "hello";
uLong dictId; /* Adler32 value of the dictionary */
void test_compress OF((Bytef *compr, uLong comprLen,
Bytef *uncompr, uLong uncomprLen));
void test_gzio OF((const char *out, const char *in,
Bytef *uncompr, int uncomprLen));
void test_deflate OF((Bytef *compr, uLong comprLen));
void test_inflate OF((Bytef *compr, uLong comprLen,
Bytef *uncompr, uLong uncomprLen));
void test_large_deflate OF((Bytef *compr, uLong comprLen,
Bytef *uncompr, uLong uncomprLen));
void test_large_inflate OF((Bytef *compr, uLong comprLen,
Bytef *uncompr, uLong uncomprLen));
void test_flush OF((Bytef *compr, uLong comprLen));
void test_sync OF((Bytef *compr, uLong comprLen,
Bytef *uncompr, uLong uncomprLen));
void test_dict_deflate OF((Bytef *compr, uLong comprLen));
void test_dict_inflate OF((Bytef *compr, uLong comprLen,
Bytef *uncompr, uLong uncomprLen));
int main OF((int argc, char *argv[]));
/* ===========================================================================
* Test compress() and uncompress()
*/
void test_compress()
void test_compress(compr, comprLen, uncompr, uncomprLen)
Bytef *compr, *uncompr;
uLong comprLen, uncomprLen;
{
local Byte compr[BUFLEN];
uLong comprLen = sizeof(compr);
local Byte uncompr[BUFLEN];
uLong uncomprLen = sizeof(uncompr);
int err;
uLong len = strlen(hello)+1;
err = compress(compr, &comprLen, (Byte*)hello, len);
err = compress(compr, &comprLen, (const Bytef*)hello, len);
CHECK_ERR(err, "compress");
strcpy((char*)uncompr, "garbage");
@@ -74,12 +77,12 @@ void test_compress()
/* ===========================================================================
* Test read/write of .gz files
*/
void test_gzio(out, in)
char *out; /* output file */
char *in; /* input file */
void test_gzio(out, in, uncompr, uncomprLen)
const char *out; /* output file */
const char *in; /* input file */
Bytef *uncompr;
int uncomprLen;
{
local Byte uncompr[BUFLEN];
int uncomprLen = sizeof(uncompr);
int err;
int len = strlen(hello)+1;
gzFile file;
@@ -90,7 +93,7 @@ void test_gzio(out, in)
exit(1);
}
if (gzwrite(file, hello, len) != len) {
if (gzwrite(file, (const voidp)hello, (unsigned)len) != len) {
fprintf(stderr, "gzwrite err: %s\n", gzerror(file, &err));
}
gzclose(file);
@@ -101,7 +104,7 @@ void test_gzio(out, in)
}
strcpy((char*)uncompr, "garbage");
uncomprLen = gzread(file, uncompr, uncomprLen);
uncomprLen = gzread(file, uncompr, (unsigned)uncomprLen);
if (uncomprLen != len) {
fprintf(stderr, "gzread err: %s\n", gzerror(file, &err));
}
@@ -117,8 +120,9 @@ void test_gzio(out, in)
/* ===========================================================================
* Test deflate() with small buffers
*/
void test_deflate(compr)
Byte compr[];
void test_deflate(compr, comprLen)
Bytef *compr;
uLong comprLen;
{
z_stream c_stream; /* compression stream */
int err;
@@ -126,14 +130,15 @@ void test_deflate(compr)
c_stream.zalloc = (alloc_func)0;
c_stream.zfree = (free_func)0;
c_stream.opaque = (voidpf)0;
err = deflateInit(&c_stream, Z_DEFAULT_COMPRESSION);
CHECK_ERR(err, "deflateInit");
c_stream.next_in = (Byte*)hello;
c_stream.next_in = (Bytef*)hello;
c_stream.next_out = compr;
while (c_stream.total_in != (uLong)len) {
while (c_stream.total_in != (uLong)len && c_stream.total_out < comprLen) {
c_stream.avail_in = c_stream.avail_out = 1; /* force small buffers */
err = deflate(&c_stream, Z_NO_FLUSH);
CHECK_ERR(err, "deflate");
@@ -153,10 +158,10 @@ void test_deflate(compr)
/* ===========================================================================
* Test inflate() with small buffers
*/
void test_inflate(compr)
Byte compr[];
void test_inflate(compr, comprLen, uncompr, uncomprLen)
Bytef *compr, *uncompr;
uLong comprLen, uncomprLen;
{
local Byte uncompr[BUFLEN];
int err;
z_stream d_stream; /* decompression stream */
@@ -164,6 +169,7 @@ void test_inflate(compr)
d_stream.zalloc = (alloc_func)0;
d_stream.zfree = (free_func)0;
d_stream.opaque = (voidpf)0;
err = inflateInit(&d_stream);
CHECK_ERR(err, "inflateInit");
@@ -171,7 +177,7 @@ void test_inflate(compr)
d_stream.next_in = compr;
d_stream.next_out = uncompr;
for (;;) {
while (d_stream.total_out < uncomprLen && d_stream.total_in < comprLen) {
d_stream.avail_in = d_stream.avail_out = 1; /* force small buffers */
err = inflate(&d_stream, Z_NO_FLUSH);
if (err == Z_STREAM_END) break;
@@ -188,11 +194,105 @@ void test_inflate(compr)
}
}
/* ===========================================================================
* Test deflate() with large buffers and dynamic change of compression level
*/
void test_large_deflate(compr, comprLen, uncompr, uncomprLen)
Bytef *compr, *uncompr;
uLong comprLen, uncomprLen;
{
z_stream c_stream; /* compression stream */
int err;
c_stream.zalloc = (alloc_func)0;
c_stream.zfree = (free_func)0;
c_stream.opaque = (voidpf)0;
err = deflateInit(&c_stream, Z_BEST_SPEED);
CHECK_ERR(err, "deflateInit");
c_stream.next_out = compr;
c_stream.avail_out = (uInt)comprLen;
/* At this point, uncompr is still mostly zeroes, so it should compress
* very well:
*/
c_stream.next_in = uncompr;
c_stream.avail_in = (uInt)uncomprLen;
err = deflate(&c_stream, Z_NO_FLUSH);
CHECK_ERR(err, "deflate");
if (c_stream.avail_in != 0) {
fprintf(stderr, "deflate not greedy\n");
}
/* Feed in already compressed data and switch to no compression: */
deflateParams(&c_stream, Z_NO_COMPRESSION, Z_DEFAULT_STRATEGY);
c_stream.next_in = compr;
c_stream.avail_in = (uInt)comprLen/2;
err = deflate(&c_stream, Z_NO_FLUSH);
CHECK_ERR(err, "deflate");
/* Switch back to compressing mode: */
deflateParams(&c_stream, Z_BEST_COMPRESSION, Z_FILTERED);
c_stream.next_in = uncompr;
c_stream.avail_in = (uInt)uncomprLen;
err = deflate(&c_stream, Z_NO_FLUSH);
CHECK_ERR(err, "deflate");
err = deflate(&c_stream, Z_FINISH);
if (err != Z_STREAM_END) {
fprintf(stderr, "deflate should report Z_STREAM_END\n");
}
err = deflateEnd(&c_stream);
CHECK_ERR(err, "deflateEnd");
}
/* ===========================================================================
* Test inflate() with large buffers
*/
void test_large_inflate(compr, comprLen, uncompr, uncomprLen)
Bytef *compr, *uncompr;
uLong comprLen, uncomprLen;
{
int err;
z_stream d_stream; /* decompression stream */
strcpy((char*)uncompr, "garbage");
d_stream.zalloc = (alloc_func)0;
d_stream.zfree = (free_func)0;
d_stream.opaque = (voidpf)0;
err = inflateInit(&d_stream);
CHECK_ERR(err, "inflateInit");
d_stream.next_in = compr;
d_stream.avail_in = (uInt)comprLen;
for (;;) {
d_stream.next_out = uncompr; /* discard the output */
d_stream.avail_out = (uInt)uncomprLen;
err = inflate(&d_stream, Z_NO_FLUSH);
if (err == Z_STREAM_END) break;
CHECK_ERR(err, "large inflate");
}
err = inflateEnd(&d_stream);
CHECK_ERR(err, "inflateEnd");
if (d_stream.total_out != 2*uncomprLen + comprLen/2) {
fprintf(stderr, "bad large inflate: %ld\n", d_stream.total_out);
} else {
printf("large_inflate(): OK\n");
}
}
/* ===========================================================================
* Test deflate() with full flush
*/
void test_flush(compr)
Byte compr[];
void test_flush(compr, comprLen)
Bytef *compr;
uLong comprLen;
{
z_stream c_stream; /* compression stream */
int err;
@@ -200,14 +300,15 @@ void test_flush(compr)
c_stream.zalloc = (alloc_func)0;
c_stream.zfree = (free_func)0;
c_stream.opaque = (voidpf)0;
err = deflateInit(&c_stream, Z_DEFAULT_COMPRESSION);
CHECK_ERR(err, "deflateInit");
c_stream.next_in = (Byte*)hello;
c_stream.next_in = (Bytef*)hello;
c_stream.next_out = compr;
c_stream.avail_in = 3;
c_stream.avail_out = BUFLEN;
c_stream.avail_out = (uInt)comprLen;
err = deflate(&c_stream, Z_FULL_FLUSH);
CHECK_ERR(err, "deflate");
@@ -225,10 +326,10 @@ void test_flush(compr)
/* ===========================================================================
* Test inflateSync()
*/
void test_sync(compr)
Byte compr[];
void test_sync(compr, comprLen, uncompr, uncomprLen)
Bytef *compr, *uncompr;
uLong comprLen, uncomprLen;
{
local Byte uncompr[BUFLEN];
int err;
z_stream d_stream; /* decompression stream */
@@ -236,6 +337,7 @@ void test_sync(compr)
d_stream.zalloc = (alloc_func)0;
d_stream.zfree = (free_func)0;
d_stream.opaque = (voidpf)0;
err = inflateInit(&d_stream);
CHECK_ERR(err, "inflateInit");
@@ -243,13 +345,13 @@ void test_sync(compr)
d_stream.next_in = compr;
d_stream.next_out = uncompr;
d_stream.avail_in = 2; /* just read the zlib header */
d_stream.avail_out = sizeof(uncompr);
d_stream.avail_out = (uInt)uncomprLen;
inflate(&d_stream, Z_NO_FLUSH);
CHECK_ERR(err, "inflate");
d_stream.avail_in = BUFLEN-2; /* let inflate read all compressed data */
err = inflateSync(&d_stream); /* skip the damaged part */
d_stream.avail_in = (uInt)comprLen-2; /* read all compressed data */
err = inflateSync(&d_stream); /* but skip the damaged part */
CHECK_ERR(err, "inflateSync");
err = inflate(&d_stream, Z_FINISH);
@@ -263,6 +365,91 @@ void test_sync(compr)
printf("after inflateSync(): hel%s\n", uncompr);
}
/* ===========================================================================
* Test deflate() with preset dictionary
*/
void test_dict_deflate(compr, comprLen)
Bytef *compr;
uLong comprLen;
{
z_stream c_stream; /* compression stream */
int err;
c_stream.zalloc = (alloc_func)0;
c_stream.zfree = (free_func)0;
c_stream.opaque = (voidpf)0;
err = deflateInit(&c_stream, Z_BEST_COMPRESSION);
CHECK_ERR(err, "deflateInit");
err = deflateSetDictionary(&c_stream,
(const Bytef*)dictionary, sizeof(dictionary));
CHECK_ERR(err, "deflateSetDictionary");
dictId = c_stream.adler;
c_stream.next_out = compr;
c_stream.avail_out = (uInt)comprLen;
c_stream.next_in = (Bytef*)hello;
c_stream.avail_in = (uInt)strlen(hello)+1;
err = deflate(&c_stream, Z_FINISH);
if (err != Z_STREAM_END) {
fprintf(stderr, "deflate should report Z_STREAM_END\n");
}
err = deflateEnd(&c_stream);
CHECK_ERR(err, "deflateEnd");
}
/* ===========================================================================
* Test inflate() with a preset dictionary
*/
void test_dict_inflate(compr, comprLen, uncompr, uncomprLen)
Bytef *compr, *uncompr;
uLong comprLen, uncomprLen;
{
int err;
z_stream d_stream; /* decompression stream */
strcpy((char*)uncompr, "garbage");
d_stream.zalloc = (alloc_func)0;
d_stream.zfree = (free_func)0;
d_stream.opaque = (voidpf)0;
err = inflateInit(&d_stream);
CHECK_ERR(err, "inflateInit");
d_stream.next_in = compr;
d_stream.avail_in = (uInt)comprLen;
d_stream.next_out = uncompr;
d_stream.avail_out = (uInt)uncomprLen;
for (;;) {
err = inflate(&d_stream, Z_NO_FLUSH);
if (err == Z_STREAM_END) break;
if (err == Z_NEED_DICT) {
if (d_stream.adler != dictId) {
fprintf(stderr, "unexpected dictionary");
exit(1);
}
err = inflateSetDictionary(&d_stream, (const Bytef*)dictionary,
sizeof(dictionary));
}
CHECK_ERR(err, "inflate with dict");
}
err = inflateEnd(&d_stream);
CHECK_ERR(err, "inflateEnd");
if (strcmp((char*)uncompr, hello)) {
fprintf(stderr, "bad inflate with dict\n");
} else {
printf("inflate with dictionary: %s\n", uncompr);
}
}
/* ===========================================================================
* Usage: example [output.gz [input.gz]]
*/
@@ -271,7 +458,9 @@ int main(argc, argv)
int argc;
char *argv[];
{
local Byte compr[BUFLEN];
Bytef *compr, *uncompr;
uLong comprLen = 32750*sizeof(int); /* don't overflow on MSDOS */
uLong uncomprLen = comprLen;
if (zlib_version[0] != ZLIB_VERSION[0]) {
fprintf(stderr, "incompatible zlib version\n");
@@ -280,16 +469,31 @@ int main(argc, argv)
} else if (strcmp(zlib_version, ZLIB_VERSION) != 0) {
fprintf(stderr, "warning: different zlib version\n");
}
test_compress();
compr = (Bytef*)malloc((uInt)comprLen);
uncompr = (Bytef*)calloc((uInt)uncomprLen, 1); /* must be cleared */
if (compr == Z_NULL || uncompr == Z_NULL) {
printf("out of memory\n");
exit(1);
}
test_compress(compr, comprLen, uncompr, uncomprLen);
test_gzio((argc > 1 ? argv[1] : "foo.gz"),
(argc > 2 ? argv[2] : "foo.gz"));
(argc > 2 ? argv[2] : "foo.gz"),
uncompr, (int)uncomprLen);
test_deflate(compr);
test_inflate(compr);
test_deflate(compr, comprLen);
test_inflate(compr, comprLen, uncompr, uncomprLen);
test_flush(compr);
test_sync(compr);
test_large_deflate(compr, comprLen, uncompr, uncomprLen);
test_large_inflate(compr, comprLen, uncompr, uncomprLen);
test_flush(compr, comprLen);
test_sync(compr, comprLen, uncompr, uncomprLen);
test_dict_deflate(compr, comprLen);
test_dict_inflate(compr, comprLen, uncompr, uncomprLen);
exit(0);
return 0; /* to avoid warning */