zlib/test/example.c - rust-lang/gcc - Git at Google

 /* example.c -- usage example of the zlib compression library
  * Copyright (C) 1995-2006, 2011 Jean-loup Gailly.
  * For conditions of distribution and use, see copyright notice in zlib.h
  */

 /* @(#) $Id$ */

 #include "zlib.h"
 #include <stdio.h>

 #ifdef STDC
 #  include <string.h>
 #  include <stdlib.h>
 #endif

 #if defined(VMS) || defined(RISCOS)
 #  define TESTFILE "foo-gz"
 #else
 #  define TESTFILE "foo.gz"
 #endif

 #define CHECK_ERR(err, msg) { \
     if (err != Z_OK) { \
         fprintf(stderr, "%s error: %d\n", msg, err); \
         exit(1); \
     } \
 }

 z_const char hello[] = "hello, hello!";
 /* "hello world" would be more standard, but the repeated "hello"
  * stresses the compression code better, sorry...
  */

 const char dictionary[] = "hello";
 uLong dictId; /* Adler32 value of the dictionary */

 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[]));


 #ifdef Z_SOLO

 void *myalloc OF((void *, unsigned, unsigned));
 void myfree OF((void *, void *));

 void *myalloc(q, n, m)
     void *q;
     unsigned n, m;
 {
     q = Z_NULL;
     return calloc(n, m);
 }

 void myfree(void *q, void *p)
 {
     q = Z_NULL;
     free(p);
 }

 static alloc_func zalloc = myalloc;
 static free_func zfree = myfree;

 #else /* !Z_SOLO */

 static alloc_func zalloc = (alloc_func)0;
 static free_func zfree = (free_func)0;

 void test_compress      OF((Byte *compr, uLong comprLen,
                             Byte *uncompr, uLong uncomprLen));
 void test_gzio          OF((const char *fname,
                             Byte *uncompr, uLong uncomprLen));

 /* ===========================================================================
  * Test compress() and uncompress()
  */
 void test_compress(compr, comprLen, uncompr, uncomprLen)
     Byte *compr, *uncompr;
     uLong comprLen, uncomprLen;
 {
     int err;
     uLong len = (uLong)strlen(hello)+1;

     err = compress(compr, &comprLen, (const Bytef*)hello, len);
     CHECK_ERR(err, "compress");

     strcpy((char*)uncompr, "garbage");

     err = uncompress(uncompr, &uncomprLen, compr, comprLen);
     CHECK_ERR(err, "uncompress");

     if (strcmp((char*)uncompr, hello)) {
         fprintf(stderr, "bad uncompress\n");
         exit(1);
     } else {
         printf("uncompress(): %s\n", (char *)uncompr);
     }
 }

 /* ===========================================================================
  * Test read/write of .gz files
  */
 void test_gzio(fname, uncompr, uncomprLen)
     const char *fname; /* compressed file name */
     Byte *uncompr;
     uLong uncomprLen;
 {
 #ifdef NO_GZCOMPRESS
     fprintf(stderr, "NO_GZCOMPRESS -- gz* functions cannot compress\n");
 #else
     int err;
     int len = (int)strlen(hello)+1;
     gzFile file;
     z_off_t pos;

     file = gzopen(fname, "wb");
     if (file == NULL) {
         fprintf(stderr, "gzopen error\n");
         exit(1);
     }
     gzputc(file, 'h');
     if (gzputs(file, "ello") != 4) {
         fprintf(stderr, "gzputs err: %s\n", gzerror(file, &err));
         exit(1);
     }
     if (gzprintf(file, ", %s!", "hello") != 8) {
         fprintf(stderr, "gzprintf err: %s\n", gzerror(file, &err));
         exit(1);
     }
     gzseek(file, 1L, SEEK_CUR); /* add one zero byte */
     gzclose(file);

     file = gzopen(fname, "rb");
     if (file == NULL) {
         fprintf(stderr, "gzopen error\n");
         exit(1);
     }
     strcpy((char*)uncompr, "garbage");

     if (gzread(file, uncompr, (unsigned)uncomprLen) != len) {
         fprintf(stderr, "gzread err: %s\n", gzerror(file, &err));
         exit(1);
     }
     if (strcmp((char*)uncompr, hello)) {
         fprintf(stderr, "bad gzread: %s\n", (char*)uncompr);
         exit(1);
     } else {
         printf("gzread(): %s\n", (char*)uncompr);
     }

     pos = gzseek(file, -8L, SEEK_CUR);
     if (pos != 6 || gztell(file) != pos) {
         fprintf(stderr, "gzseek error, pos=%ld, gztell=%ld\n",
                 (long)pos, (long)gztell(file));
         exit(1);
     }

     if (gzgetc(file) != ' ') {
         fprintf(stderr, "gzgetc error\n");
         exit(1);
     }

     if (gzungetc(' ', file) != ' ') {
         fprintf(stderr, "gzungetc error\n");
         exit(1);
     }

     gzgets(file, (char*)uncompr, (int)uncomprLen);
     if (strlen((char*)uncompr) != 7) { /* " hello!" */
         fprintf(stderr, "gzgets err after gzseek: %s\n", gzerror(file, &err));
         exit(1);
     }
     if (strcmp((char*)uncompr, hello + 6)) {
         fprintf(stderr, "bad gzgets after gzseek\n");
         exit(1);
     } else {
         printf("gzgets() after gzseek: %s\n", (char*)uncompr);
     }

     gzclose(file);
 #endif
 }

 #endif /* Z_SOLO */

 /* ===========================================================================
  * Test deflate() with small buffers
  */
 void test_deflate(compr, comprLen)
     Byte *compr;
     uLong comprLen;
 {
     z_stream c_stream; /* compression stream */
     int err;
     uLong len = (uLong)strlen(hello)+1;

     c_stream.zalloc = zalloc;
     c_stream.zfree = zfree;
     c_stream.opaque = (voidpf)0;

     err = deflateInit(&c_stream, Z_DEFAULT_COMPRESSION);
     CHECK_ERR(err, "deflateInit");

     c_stream.next_in  = (z_const unsigned char *)hello;
     c_stream.next_out = compr;

     while (c_stream.total_in != 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");
     }
     /* Finish the stream, still forcing small buffers: */
     for (;;) {
         c_stream.avail_out = 1;
         err = deflate(&c_stream, Z_FINISH);
         if (err == Z_STREAM_END) break;
         CHECK_ERR(err, "deflate");
     }

     err = deflateEnd(&c_stream);
     CHECK_ERR(err, "deflateEnd");
 }

 /* ===========================================================================
  * Test inflate() with small buffers
  */
 void test_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 = zalloc;
     d_stream.zfree = zfree;
     d_stream.opaque = (voidpf)0;

     d_stream.next_in  = compr;
     d_stream.avail_in = 0;
     d_stream.next_out = uncompr;

     err = inflateInit(&d_stream);
     CHECK_ERR(err, "inflateInit");

     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;
         CHECK_ERR(err, "inflate");
     }

     err = inflateEnd(&d_stream);
     CHECK_ERR(err, "inflateEnd");

     if (strcmp((char*)uncompr, hello)) {
         fprintf(stderr, "bad inflate\n");
         exit(1);
     } else {
         printf("inflate(): %s\n", (char *)uncompr);
     }
 }

 /* ===========================================================================
  * Test deflate() with large buffers and dynamic change of compression level
  */
 void test_large_deflate(compr, comprLen, uncompr, uncomprLen)
     Byte *compr, *uncompr;
     uLong comprLen, uncomprLen;
 {
     z_stream c_stream; /* compression stream */
     int err;

     c_stream.zalloc = zalloc;
     c_stream.zfree = zfree;
     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");
         exit(1);
     }

     /* 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");
         exit(1);
     }
     err = deflateEnd(&c_stream);
     CHECK_ERR(err, "deflateEnd");
 }

 /* ===========================================================================
  * Test inflate() with large buffers
  */
 void test_large_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 = zalloc;
     d_stream.zfree = zfree;
     d_stream.opaque = (voidpf)0;

     d_stream.next_in  = compr;
     d_stream.avail_in = (uInt)comprLen;

     err = inflateInit(&d_stream);
     CHECK_ERR(err, "inflateInit");

     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);
         exit(1);
     } else {
         printf("large_inflate(): OK\n");
     }
 }

 /* ===========================================================================
  * Test deflate() with full flush
  */
 void test_flush(compr, comprLen)
     Byte *compr;
     uLong *comprLen;
 {
     z_stream c_stream; /* compression stream */
     int err;
     uInt len = (uInt)strlen(hello)+1;

     c_stream.zalloc = zalloc;
     c_stream.zfree = zfree;
     c_stream.opaque = (voidpf)0;

     err = deflateInit(&c_stream, Z_DEFAULT_COMPRESSION);
     CHECK_ERR(err, "deflateInit");

     c_stream.next_in  = (z_const unsigned char *)hello;
     c_stream.next_out = compr;
     c_stream.avail_in = 3;
     c_stream.avail_out = (uInt)*comprLen;
     err = deflate(&c_stream, Z_FULL_FLUSH);
     CHECK_ERR(err, "deflate");

     compr[3]++; /* force an error in first compressed block */
     c_stream.avail_in = len - 3;

     err = deflate(&c_stream, Z_FINISH);
     if (err != Z_STREAM_END) {
         CHECK_ERR(err, "deflate");
     }
     err = deflateEnd(&c_stream);
     CHECK_ERR(err, "deflateEnd");

     *comprLen = c_stream.total_out;
 }

 /* ===========================================================================
  * Test inflateSync()
  */
 void test_sync(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 = zalloc;
     d_stream.zfree = zfree;
     d_stream.opaque = (voidpf)0;

     d_stream.next_in  = compr;
     d_stream.avail_in = 2; /* just read the zlib header */

     err = inflateInit(&d_stream);
     CHECK_ERR(err, "inflateInit");

     d_stream.next_out = uncompr;
     d_stream.avail_out = (uInt)uncomprLen;

     inflate(&d_stream, Z_NO_FLUSH);
     CHECK_ERR(err, "inflate");

     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);
     if (err != Z_DATA_ERROR) {
         fprintf(stderr, "inflate should report DATA_ERROR\n");
         /* Because of incorrect adler32 */
         exit(1);
     }
     err = inflateEnd(&d_stream);
     CHECK_ERR(err, "inflateEnd");

     printf("after inflateSync(): hel%s\n", (char *)uncompr);
 }

 /* ===========================================================================
  * 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 = zalloc;
     c_stream.zfree = zfree;
     c_stream.opaque = (voidpf)0;

     err = deflateInit(&c_stream, Z_BEST_COMPRESSION);
     CHECK_ERR(err, "deflateInit");

     err = deflateSetDictionary(&c_stream,
                 (const Bytef*)dictionary, (int)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 = (z_const unsigned char *)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");
         exit(1);
     }
     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 = zalloc;
     d_stream.zfree = zfree;
     d_stream.opaque = (voidpf)0;

     d_stream.next_in  = compr;
     d_stream.avail_in = (uInt)comprLen;

     err = inflateInit(&d_stream);
     CHECK_ERR(err, "inflateInit");

     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,
                                        (int)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");
         exit(1);
     } else {
         printf("inflate with dictionary: %s\n", (char *)uncompr);
     }
 }

 /* ===========================================================================
  * Usage:  example [output.gz  [input.gz]]
  */

 int main(argc, argv)
     int argc;
     char *argv[];
 {
     Byte *compr, *uncompr;
     uLong comprLen = 10000*sizeof(int); /* don't overflow on MSDOS */
     uLong uncomprLen = comprLen;
     static const char* myVersion = ZLIB_VERSION;

     if (zlibVersion()[0] != myVersion[0]) {
         fprintf(stderr, "incompatible zlib version\n");
         exit(1);

     } else if (strcmp(zlibVersion(), ZLIB_VERSION) != 0) {
         fprintf(stderr, "warning: different zlib version\n");
     }

     printf("zlib version %s = 0x%04x, compile flags = 0x%lx\n",
             ZLIB_VERSION, ZLIB_VERNUM, zlibCompileFlags());

     compr    = (Byte*)calloc((uInt)comprLen, 1);
     uncompr  = (Byte*)calloc((uInt)uncomprLen, 1);
     /* compr and uncompr are cleared to avoid reading uninitialized
      * data and to ensure that uncompr compresses well.
      */
     if (compr == Z_NULL || uncompr == Z_NULL) {
         printf("out of memory\n");
         exit(1);
     }

 #ifdef Z_SOLO
     argc = strlen(argv[0]);
 #else
     test_compress(compr, comprLen, uncompr, uncomprLen);

     test_gzio((argc > 1 ? argv[1] : TESTFILE),
               uncompr, uncomprLen);
 #endif

     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_flush(compr, &comprLen);
     test_sync(compr, comprLen, uncompr, uncomprLen);
     comprLen = uncomprLen;

     test_dict_deflate(compr, comprLen);
     test_dict_inflate(compr, comprLen, uncompr, uncomprLen);

     free(compr);
     free(uncompr);

     return 0;
 }
	/* example.c -- usage example of the zlib compression library
	* Copyright (C) 1995-2006, 2011 Jean-loup Gailly.
	* For conditions of distribution and use, see copyright notice in zlib.h
	*/

	/* @(#) $Id$ */

	#include "zlib.h"
	#include <stdio.h>

	#ifdef STDC
	# include <string.h>
	# include <stdlib.h>
	#endif

	#if defined(VMS) \|\| defined(RISCOS)
	# define TESTFILE "foo-gz"
	#else
	# define TESTFILE "foo.gz"
	#endif

	#define CHECK_ERR(err, msg) { \
	if (err != Z_OK) { \
	fprintf(stderr, "%s error: %d\n", msg, err); \
	exit(1); \
	} \
	}

	z_const char hello[] = "hello, hello!";
	/* "hello world" would be more standard, but the repeated "hello"
	* stresses the compression code better, sorry...
	*/

	const char dictionary[] = "hello";
	uLong dictId; /* Adler32 value of the dictionary */

	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[]));


	#ifdef Z_SOLO

	void myalloc OF((void , unsigned, unsigned));
	void myfree OF((void , void ));

	void *myalloc(q, n, m)
	void *q;
	unsigned n, m;
	{
	q = Z_NULL;
	return calloc(n, m);
	}

	void myfree(void q, void p)
	{
	q = Z_NULL;
	free(p);
	}

	static alloc_func zalloc = myalloc;
	static free_func zfree = myfree;

	#else /* !Z_SOLO */

	static alloc_func zalloc = (alloc_func)0;
	static free_func zfree = (free_func)0;

	void test_compress OF((Byte *compr, uLong comprLen,
	Byte *uncompr, uLong uncomprLen));
	void test_gzio OF((const char *fname,
	Byte *uncompr, uLong uncomprLen));

	/* ===========================================================================
	* Test compress() and uncompress()
	*/
	void test_compress(compr, comprLen, uncompr, uncomprLen)
	Byte compr, uncompr;
	uLong comprLen, uncomprLen;
	{
	int err;
	uLong len = (uLong)strlen(hello)+1;

	err = compress(compr, &comprLen, (const Bytef*)hello, len);
	CHECK_ERR(err, "compress");

	strcpy((char*)uncompr, "garbage");

	err = uncompress(uncompr, &uncomprLen, compr, comprLen);
	CHECK_ERR(err, "uncompress");

	if (strcmp((char*)uncompr, hello)) {
	fprintf(stderr, "bad uncompress\n");
	exit(1);
	} else {
	printf("uncompress(): %s\n", (char *)uncompr);
	}
	}

	/* ===========================================================================
	* Test read/write of .gz files
	*/
	void test_gzio(fname, uncompr, uncomprLen)
	const char fname; / compressed file name */
	Byte *uncompr;
	uLong uncomprLen;
	{
	#ifdef NO_GZCOMPRESS
	fprintf(stderr, "NO_GZCOMPRESS -- gz* functions cannot compress\n");
	#else
	int err;
	int len = (int)strlen(hello)+1;
	gzFile file;
	z_off_t pos;

	file = gzopen(fname, "wb");
	if (file == NULL) {
	fprintf(stderr, "gzopen error\n");
	exit(1);
	}
	gzputc(file, 'h');
	if (gzputs(file, "ello") != 4) {
	fprintf(stderr, "gzputs err: %s\n", gzerror(file, &err));
	exit(1);
	}
	if (gzprintf(file, ", %s!", "hello") != 8) {
	fprintf(stderr, "gzprintf err: %s\n", gzerror(file, &err));
	exit(1);
	}
	gzseek(file, 1L, SEEK_CUR); /* add one zero byte */
	gzclose(file);

	file = gzopen(fname, "rb");
	if (file == NULL) {
	fprintf(stderr, "gzopen error\n");
	exit(1);
	}
	strcpy((char*)uncompr, "garbage");

	if (gzread(file, uncompr, (unsigned)uncomprLen) != len) {
	fprintf(stderr, "gzread err: %s\n", gzerror(file, &err));
	exit(1);
	}
	if (strcmp((char*)uncompr, hello)) {
	fprintf(stderr, "bad gzread: %s\n", (char*)uncompr);
	exit(1);
	} else {
	printf("gzread(): %s\n", (char*)uncompr);
	}

	pos = gzseek(file, -8L, SEEK_CUR);
	if (pos != 6 \|\| gztell(file) != pos) {
	fprintf(stderr, "gzseek error, pos=%ld, gztell=%ld\n",
	(long)pos, (long)gztell(file));
	exit(1);
	}

	if (gzgetc(file) != ' ') {
	fprintf(stderr, "gzgetc error\n");
	exit(1);
	}

	if (gzungetc(' ', file) != ' ') {
	fprintf(stderr, "gzungetc error\n");
	exit(1);
	}

	gzgets(file, (char*)uncompr, (int)uncomprLen);
	if (strlen((char)uncompr) != 7) { / " hello!" */
	fprintf(stderr, "gzgets err after gzseek: %s\n", gzerror(file, &err));
	exit(1);
	}
	if (strcmp((char*)uncompr, hello + 6)) {
	fprintf(stderr, "bad gzgets after gzseek\n");
	exit(1);
	} else {
	printf("gzgets() after gzseek: %s\n", (char*)uncompr);
	}

	gzclose(file);
	#endif
	}

	#endif /* Z_SOLO */

	/* ===========================================================================
	* Test deflate() with small buffers
	*/
	void test_deflate(compr, comprLen)
	Byte *compr;
	uLong comprLen;
	{
	z_stream c_stream; /* compression stream */
	int err;
	uLong len = (uLong)strlen(hello)+1;

	c_stream.zalloc = zalloc;
	c_stream.zfree = zfree;
	c_stream.opaque = (voidpf)0;

	err = deflateInit(&c_stream, Z_DEFAULT_COMPRESSION);
	CHECK_ERR(err, "deflateInit");

	c_stream.next_in = (z_const unsigned char *)hello;
	c_stream.next_out = compr;

	while (c_stream.total_in != 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");
	}
	/* Finish the stream, still forcing small buffers: */
	for (;;) {
	c_stream.avail_out = 1;
	err = deflate(&c_stream, Z_FINISH);
	if (err == Z_STREAM_END) break;
	CHECK_ERR(err, "deflate");
	}

	err = deflateEnd(&c_stream);
	CHECK_ERR(err, "deflateEnd");
	}

	/* ===========================================================================
	* Test inflate() with small buffers
	*/
	void test_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 = zalloc;
	d_stream.zfree = zfree;
	d_stream.opaque = (voidpf)0;

	d_stream.next_in = compr;
	d_stream.avail_in = 0;
	d_stream.next_out = uncompr;

	err = inflateInit(&d_stream);
	CHECK_ERR(err, "inflateInit");

	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;
	CHECK_ERR(err, "inflate");
	}

	err = inflateEnd(&d_stream);
	CHECK_ERR(err, "inflateEnd");

	if (strcmp((char*)uncompr, hello)) {
	fprintf(stderr, "bad inflate\n");
	exit(1);
	} else {
	printf("inflate(): %s\n", (char *)uncompr);
	}
	}

	/* ===========================================================================
	* Test deflate() with large buffers and dynamic change of compression level
	*/
	void test_large_deflate(compr, comprLen, uncompr, uncomprLen)
	Byte compr, uncompr;
	uLong comprLen, uncomprLen;
	{
	z_stream c_stream; /* compression stream */
	int err;

	c_stream.zalloc = zalloc;
	c_stream.zfree = zfree;
	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");
	exit(1);
	}

	/* 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");
	exit(1);
	}
	err = deflateEnd(&c_stream);
	CHECK_ERR(err, "deflateEnd");
	}

	/* ===========================================================================
	* Test inflate() with large buffers
	*/
	void test_large_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 = zalloc;
	d_stream.zfree = zfree;
	d_stream.opaque = (voidpf)0;

	d_stream.next_in = compr;
	d_stream.avail_in = (uInt)comprLen;

	err = inflateInit(&d_stream);
	CHECK_ERR(err, "inflateInit");

	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);
	exit(1);
	} else {
	printf("large_inflate(): OK\n");
	}
	}

	/* ===========================================================================
	* Test deflate() with full flush
	*/
	void test_flush(compr, comprLen)
	Byte *compr;
	uLong *comprLen;
	{
	z_stream c_stream; /* compression stream */
	int err;
	uInt len = (uInt)strlen(hello)+1;

	c_stream.zalloc = zalloc;
	c_stream.zfree = zfree;
	c_stream.opaque = (voidpf)0;

	err = deflateInit(&c_stream, Z_DEFAULT_COMPRESSION);
	CHECK_ERR(err, "deflateInit");

	c_stream.next_in = (z_const unsigned char *)hello;
	c_stream.next_out = compr;
	c_stream.avail_in = 3;
	c_stream.avail_out = (uInt)*comprLen;
	err = deflate(&c_stream, Z_FULL_FLUSH);
	CHECK_ERR(err, "deflate");

	compr[3]++; /* force an error in first compressed block */
	c_stream.avail_in = len - 3;

	err = deflate(&c_stream, Z_FINISH);
	if (err != Z_STREAM_END) {
	CHECK_ERR(err, "deflate");
	}
	err = deflateEnd(&c_stream);
	CHECK_ERR(err, "deflateEnd");

	*comprLen = c_stream.total_out;
	}

	/* ===========================================================================
	* Test inflateSync()
	*/
	void test_sync(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 = zalloc;
	d_stream.zfree = zfree;
	d_stream.opaque = (voidpf)0;

	d_stream.next_in = compr;
	d_stream.avail_in = 2; /* just read the zlib header */

	err = inflateInit(&d_stream);
	CHECK_ERR(err, "inflateInit");

	d_stream.next_out = uncompr;
	d_stream.avail_out = (uInt)uncomprLen;

	inflate(&d_stream, Z_NO_FLUSH);
	CHECK_ERR(err, "inflate");

	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);
	if (err != Z_DATA_ERROR) {
	fprintf(stderr, "inflate should report DATA_ERROR\n");
	/* Because of incorrect adler32 */
	exit(1);
	}
	err = inflateEnd(&d_stream);
	CHECK_ERR(err, "inflateEnd");

	printf("after inflateSync(): hel%s\n", (char *)uncompr);
	}

	/* ===========================================================================
	* 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 = zalloc;
	c_stream.zfree = zfree;
	c_stream.opaque = (voidpf)0;

	err = deflateInit(&c_stream, Z_BEST_COMPRESSION);
	CHECK_ERR(err, "deflateInit");

	err = deflateSetDictionary(&c_stream,
	(const Bytef*)dictionary, (int)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 = (z_const unsigned char *)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");
	exit(1);
	}
	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 = zalloc;
	d_stream.zfree = zfree;
	d_stream.opaque = (voidpf)0;

	d_stream.next_in = compr;
	d_stream.avail_in = (uInt)comprLen;

	err = inflateInit(&d_stream);
	CHECK_ERR(err, "inflateInit");

	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,
	(int)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");
	exit(1);
	} else {
	printf("inflate with dictionary: %s\n", (char *)uncompr);
	}
	}

	/* ===========================================================================
	* Usage: example [output.gz [input.gz]]
	*/

	int main(argc, argv)
	int argc;
	char *argv[];
	{
	Byte compr, uncompr;
	uLong comprLen = 10000sizeof(int); / don't overflow on MSDOS */
	uLong uncomprLen = comprLen;
	static const char* myVersion = ZLIB_VERSION;

	if (zlibVersion()[0] != myVersion[0]) {
	fprintf(stderr, "incompatible zlib version\n");
	exit(1);

	} else if (strcmp(zlibVersion(), ZLIB_VERSION) != 0) {
	fprintf(stderr, "warning: different zlib version\n");
	}

	printf("zlib version %s = 0x%04x, compile flags = 0x%lx\n",
	ZLIB_VERSION, ZLIB_VERNUM, zlibCompileFlags());

	compr = (Byte*)calloc((uInt)comprLen, 1);
	uncompr = (Byte*)calloc((uInt)uncomprLen, 1);
	/* compr and uncompr are cleared to avoid reading uninitialized
	* data and to ensure that uncompr compresses well.
	*/
	if (compr == Z_NULL \|\| uncompr == Z_NULL) {
	printf("out of memory\n");
	exit(1);
	}

	#ifdef Z_SOLO
	argc = strlen(argv[0]);
	#else
	test_compress(compr, comprLen, uncompr, uncomprLen);

	test_gzio((argc > 1 ? argv[1] : TESTFILE),
	uncompr, uncomprLen);
	#endif

	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_flush(compr, &comprLen);
	test_sync(compr, comprLen, uncompr, uncomprLen);
	comprLen = uncomprLen;

	test_dict_deflate(compr, comprLen);
	test_dict_inflate(compr, comprLen, uncompr, uncomprLen);

	free(compr);
	free(uncompr);

	return 0;
	}