/* example.c -- usage example of the zlib compression library * Copyright (C) 1995-1996 Jean-loup Gailly. * For conditions of distribution and use, see copyright notice in zlib.h */ /* $Id: example.c,v 1.16 1996/05/23 17:11:28 me Exp $ */ #include <stdio.h>#include "zlib.h" #ifdef STDC# include <string.h># include <stdlib.h>#else extern void exit OF((int));#endif #define CHECK_ERR(err, msg) { \ if (err != Z_OK) { \ fprintf(stderr, "%s error: %d\n", msg, err); \ exit(1); \ } \} 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_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) Byte *compr, *uncompr; uLong comprLen, uncomprLen;{ int err; uLong len = 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"); } else { printf("uncompress(): %s\n", uncompr); }} /* =========================================================================== * Test read/write of .gz files */void test_gzio(out, in, uncompr, uncomprLen) const char *out; /* output file */ const char *in; /* input file */ Byte *uncompr; int uncomprLen;{ int err; int len = strlen(hello)+1; gzFile file; file = gzopen(out, "wb"); if (file == NULL) { fprintf(stderr, "gzopen error\n"); exit(1); } if (gzwrite(file, (const voidp)hello, (unsigned)len) != len) { fprintf(stderr, "gzwrite err: %s\n", gzerror(file, &err)); } gzclose(file); file = gzopen(in, "rb"); if (file == NULL) { fprintf(stderr, "gzopen error\n"); } strcpy((char*)uncompr, "garbage"); uncomprLen = gzread(file, uncompr, (unsigned)uncomprLen); if (uncomprLen != len) { fprintf(stderr, "gzread err: %s\n", gzerror(file, &err)); } gzclose(file); if (strcmp((char*)uncompr, hello)) { fprintf(stderr, "bad gzread\n"); } else { printf("gzread(): %s\n", uncompr); }} /* =========================================================================== * Test deflate() with small buffers */void test_deflate(compr, comprLen) Byte *compr; uLong comprLen;{ z_stream c_stream; /* compression stream */ int err; int len = strlen(hello)+1; 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 = (Bytef*)hello; c_stream.next_out = compr; 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"); } /* 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 = (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.next_out = uncompr; 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"); } else { printf("inflate(): %s\n", 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 = (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) 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; 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, comprLen) Byte *compr; uLong comprLen;{ z_stream c_stream; /* compression stream */ int err; int len = strlen(hello)+1; 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 = (Bytef*)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");} /* =========================================================================== * 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 = (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.next_out = uncompr; d_stream.avail_in = 2; /* just read the zlib header */ 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 */ } err = inflateEnd(&d_stream); CHECK_ERR(err, "inflateEnd"); printf("after inflateSync(): hel%s\n", 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 = (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]] */ int main(argc, argv) int argc; char *argv[];{ Byte *compr, *uncompr; uLong comprLen = 10000*sizeof(int); /* don't overflow on MSDOS */ uLong uncomprLen = comprLen; if (zlibVersion()[0] != ZLIB_VERSION[0]) { fprintf(stderr, "incompatible zlib version\n"); exit(1); } else if (strcmp(zlibVersion(), ZLIB_VERSION) != 0) { fprintf(stderr, "warning: different zlib version\n"); } 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); } test_compress(compr, comprLen, uncompr, uncomprLen); test_gzio((argc > 1 ? argv[1] : "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_flush(compr, comprLen); test_sync(compr, comprLen, uncompr, uncomprLen); test_dict_deflate(compr, comprLen); test_dict_inflate(compr, comprLen, uncompr, uncomprLen); Lines 1–500 of 503. 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/* example.c -- usage example of the zlib compression library * Copyright (C) 1995-1996 Jean-loup Gailly. * For conditions of distribution and use, see copyright notice in zlib.h */ /* $Id: example.c,v 1.16 1996/05/23 17:11:28 me Exp $ */ #include <stdio.h> #include "zlib.h" #ifdef STDC # include <string.h> # include <stdlib.h> #else extern void exit OF((int)); #endif #define CHECK_ERR(err, msg) { \ if (err != Z_OK) { \ fprintf(stderr, "%s error: %d\n", msg, err); \ exit(1); \ } \ } 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_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) Byte *compr, *uncompr; uLong comprLen, uncomprLen; { int err; uLong len = 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"); } else { printf("uncompress(): %s\n", uncompr); } } /* =========================================================================== * Test read/write of .gz files */ void test_gzio(out, in, uncompr, uncomprLen) const char *out; /* output file */ const char *in; /* input file */ Byte *uncompr; int uncomprLen; { int err; int len = strlen(hello)+1; gzFile file; file = gzopen(out, "wb"); if (file == NULL) { fprintf(stderr, "gzopen error\n"); exit(1); } if (gzwrite(file, (const voidp)hello, (unsigned)len) != len) { fprintf(stderr, "gzwrite err: %s\n", gzerror(file, &err)); } gzclose(file); file = gzopen(in, "rb"); if (file == NULL) { fprintf(stderr, "gzopen error\n"); } strcpy((char*)uncompr, "garbage"); uncomprLen = gzread(file, uncompr, (unsigned)uncomprLen); if (uncomprLen != len) { fprintf(stderr, "gzread err: %s\n", gzerror(file, &err)); } gzclose(file); if (strcmp((char*)uncompr, hello)) { fprintf(stderr, "bad gzread\n"); } else { printf("gzread(): %s\n", uncompr); } } /* =========================================================================== * Test deflate() with small buffers */ void test_deflate(compr, comprLen) Byte *compr; uLong comprLen; { z_stream c_stream; /* compression stream */ int err; int len = strlen(hello)+1; 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 = (Bytef*)hello; c_stream.next_out = compr; 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"); } /* 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 = (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.next_out = uncompr; 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"); } else { printf("inflate(): %s\n", 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 = (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) 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; 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, comprLen) Byte *compr; uLong comprLen; { z_stream c_stream; /* compression stream */ int err; int len = strlen(hello)+1; 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 = (Bytef*)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"); } /* =========================================================================== * 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 = (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.next_out = uncompr; d_stream.avail_in = 2; /* just read the zlib header */ 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 */ } err = inflateEnd(&d_stream); CHECK_ERR(err, "inflateEnd"); printf("after inflateSync(): hel%s\n", 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 = (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]] */ int main(argc, argv) int argc; char *argv[]; { Byte *compr, *uncompr; uLong comprLen = 10000*sizeof(int); /* don't overflow on MSDOS */ uLong uncomprLen = comprLen; if (zlibVersion()[0] != ZLIB_VERSION[0]) { fprintf(stderr, "incompatible zlib version\n"); exit(1); } else if (strcmp(zlibVersion(), ZLIB_VERSION) != 0) { fprintf(stderr, "warning: different zlib version\n"); } 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); } test_compress(compr, comprLen, uncompr, uncomprLen); test_gzio((argc > 1 ? argv[1] : "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_flush(compr, comprLen); test_sync(compr, comprLen, uncompr, uncomprLen); test_dict_deflate(compr, comprLen); test_dict_inflate(compr, comprLen, uncompr, uncomprLen);