summaryrefslogtreecommitdiff
path: root/example.c
diff options
context:
space:
mode:
Diffstat (limited to 'example.c')
-rw-r--r--example.c170
1 files changed, 132 insertions, 38 deletions
diff --git a/example.c b/example.c
index fddb8f8..175fa81 100644
--- a/example.c
+++ b/example.c
@@ -1,9 +1,9 @@
/* 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
*/
-/* $Id: example.c,v 1.9 1995/05/03 17:27:09 jloup Exp $ */
+/* $Id: example.c,v 1.13 1996/01/30 21:59:13 me Exp $ */
#include <stdio.h>
#include "zlib.h"
@@ -22,38 +22,44 @@
} \
}
-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((Bytef *compr, uLong comprLen,
- Bytef *uncompr, uLong uncomprLen));
-void test_gzio OF((char *out, 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));
+const char dictionary[] = "hello";
+uLong dictId; /* Adler32 value of the dictionary */
+
+void test_compress OF((Byte *compr, uLong comprLen,
+ Byte *uncompr, uLong uncomprLen));
+void test_gzio OF((const char *out, const char *in,
+ Byte *uncompr, int uncomprLen));
+void test_deflate OF((Byte *compr, uLong comprLen));
+void test_inflate OF((Byte *compr, uLong comprLen,
+ Byte *uncompr, uLong uncomprLen));
+void test_large_deflate OF((Byte *compr, uLong comprLen,
+ Byte *uncompr, uLong uncomprLen));
+void test_large_inflate OF((Byte *compr, uLong comprLen,
+ Byte *uncompr, uLong uncomprLen));
+void test_flush OF((Byte *compr, uLong comprLen));
+void test_sync OF((Byte *compr, uLong comprLen,
+ Byte *uncompr, uLong uncomprLen));
+void test_dict_deflate OF((Byte *compr, uLong comprLen));
+void test_dict_inflate OF((Byte *compr, uLong comprLen,
+ Byte *uncompr, uLong uncomprLen));
int main OF((int argc, char *argv[]));
/* ===========================================================================
* Test compress() and uncompress()
*/
void test_compress(compr, comprLen, uncompr, uncomprLen)
- Bytef *compr, *uncompr;
+ Byte *compr, *uncompr;
uLong comprLen, uncomprLen;
{
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");
@@ -72,9 +78,9 @@ void test_compress(compr, comprLen, uncompr, uncomprLen)
* Test read/write of .gz files
*/
void test_gzio(out, in, uncompr, uncomprLen)
- char *out; /* output file */
- char *in; /* input file */
- Bytef *uncompr;
+ const char *out; /* output file */
+ const char *in; /* input file */
+ Byte *uncompr;
int uncomprLen;
{
int err;
@@ -87,7 +93,7 @@ void test_gzio(out, in, uncompr, uncomprLen)
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);
@@ -98,7 +104,7 @@ void test_gzio(out, in, uncompr, uncomprLen)
}
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));
}
@@ -115,7 +121,7 @@ void test_gzio(out, in, uncompr, uncomprLen)
* Test deflate() with small buffers
*/
void test_deflate(compr, comprLen)
- Bytef *compr;
+ Byte *compr;
uLong comprLen;
{
z_stream c_stream; /* compression stream */
@@ -153,7 +159,7 @@ void test_deflate(compr, comprLen)
* Test inflate() with small buffers
*/
void test_inflate(compr, comprLen, uncompr, uncomprLen)
- Bytef *compr, *uncompr;
+ Byte *compr, *uncompr;
uLong comprLen, uncomprLen;
{
int err;
@@ -171,7 +177,7 @@ void test_inflate(compr, comprLen, uncompr, uncomprLen)
d_stream.next_in = compr;
d_stream.next_out = uncompr;
- while (d_stream.total_out < uncomprLen) {
+ 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;
@@ -192,7 +198,7 @@ void test_inflate(compr, comprLen, uncompr, uncomprLen)
* Test deflate() with large buffers and dynamic change of compression level
*/
void test_large_deflate(compr, comprLen, uncompr, uncomprLen)
- Bytef *compr, *uncompr;
+ Byte *compr, *uncompr;
uLong comprLen, uncomprLen;
{
z_stream c_stream; /* compression stream */
@@ -206,7 +212,7 @@ void test_large_deflate(compr, comprLen, uncompr, uncomprLen)
CHECK_ERR(err, "deflateInit");
c_stream.next_out = compr;
- c_stream.avail_out = comprLen;
+ c_stream.avail_out = (uInt)comprLen;
/* At this point, uncompr is still mostly zeroes, so it should compress
* very well:
@@ -245,7 +251,7 @@ void test_large_deflate(compr, comprLen, uncompr, uncomprLen)
* Test inflate() with large buffers
*/
void test_large_inflate(compr, comprLen, uncompr, uncomprLen)
- Bytef *compr, *uncompr;
+ Byte *compr, *uncompr;
uLong comprLen, uncomprLen;
{
int err;
@@ -265,7 +271,7 @@ void test_large_inflate(compr, comprLen, uncompr, uncomprLen)
for (;;) {
d_stream.next_out = uncompr; /* discard the output */
- d_stream.avail_out = uncomprLen;
+ d_stream.avail_out = (uInt)uncomprLen;
err = inflate(&d_stream, Z_NO_FLUSH);
if (err == Z_STREAM_END) break;
CHECK_ERR(err, "large inflate");
@@ -285,7 +291,7 @@ void test_large_inflate(compr, comprLen, uncompr, uncomprLen)
* Test deflate() with full flush
*/
void test_flush(compr, comprLen)
- Bytef *compr;
+ Byte *compr;
uLong comprLen;
{
z_stream c_stream; /* compression stream */
@@ -321,7 +327,7 @@ void test_flush(compr, comprLen)
* Test inflateSync()
*/
void test_sync(compr, comprLen, uncompr, uncomprLen)
- Bytef *compr, *uncompr;
+ Byte *compr, *uncompr;
uLong comprLen, uncomprLen;
{
int err;
@@ -344,7 +350,7 @@ void test_sync(compr, comprLen, uncompr, uncomprLen)
inflate(&d_stream, Z_NO_FLUSH);
CHECK_ERR(err, "inflate");
- d_stream.avail_in = (uInt)uncomprLen-2; /* read all compressed data */
+ d_stream.avail_in = (uInt)comprLen-2; /* read all compressed data */
err = inflateSync(&d_stream); /* but skip the damaged part */
CHECK_ERR(err, "inflateSync");
@@ -360,6 +366,91 @@ void test_sync(compr, comprLen, uncompr, uncomprLen)
}
/* ===========================================================================
+ * Test deflate() with preset dictionary
+ */
+void test_dict_deflate(compr, comprLen)
+ Byte *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)
+ Byte *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]]
*/
@@ -367,8 +458,8 @@ int main(argc, argv)
int argc;
char *argv[];
{
- Bytef *compr, *uncompr;
- uLong comprLen = 32750*sizeof(int); /* don't overflow on MSDOS */
+ Byte *compr, *uncompr;
+ uLong comprLen = 10000*sizeof(int); /* don't overflow on MSDOS */
uLong uncomprLen = comprLen;
if (zlib_version[0] != ZLIB_VERSION[0]) {
@@ -379,8 +470,8 @@ int main(argc, argv)
fprintf(stderr, "warning: different zlib version\n");
}
- compr = (Bytef*)malloc(comprLen);
- uncompr = (Bytef*)calloc(uncomprLen, 1); /* must be cleared initially */
+ compr = (Byte*)malloc((uInt)comprLen);
+ uncompr = (Byte*)calloc((uInt)uncomprLen, 1); /* must be cleared */
if (compr == Z_NULL || uncompr == Z_NULL) {
printf("out of memory\n");
exit(1);
@@ -401,6 +492,9 @@ int main(argc, argv)
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 */
}
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-03 20:27:36 +0000