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-rw-r--r--example.c322
1 files changed, 263 insertions, 59 deletions
diff --git a/example.c b/example.c
index c18a583..7a3047d 100644
--- a/example.c
+++ b/example.c
@@ -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;
@@ -189,10 +195,104 @@ 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);
@@ -264,6 +366,91 @@ void test_sync(compr)
}
/* ===========================================================================
+ * 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, comprLen);
+ test_inflate(compr, comprLen, uncompr, uncomprLen);
+
+ test_large_deflate(compr, comprLen, uncompr, uncomprLen);
+ test_large_inflate(compr, comprLen, uncompr, uncomprLen);
- test_deflate(compr);
- test_inflate(compr);
+ test_flush(compr, comprLen);
+ test_sync(compr, comprLen, uncompr, uncomprLen);
- test_flush(compr);
- test_sync(compr);
+ test_dict_deflate(compr, comprLen);
+ test_dict_inflate(compr, comprLen, uncompr, uncomprLen);
exit(0);
return 0; /* to avoid warning */
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