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unneback |
/* example.c -- usage example of the zlib compression library
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* Copyright (C) 1995-1998 Jean-loup Gailly.
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* For conditions of distribution and use, see copyright notice in zlib.h
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*/
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/* @(#) $Id: example.c,v 1.1.1.1 2004-02-14 13:35:37 phoenix Exp $ */
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#include <stdio.h>
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#include "zlib.h"
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#ifdef STDC
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# include <string.h>
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# include <stdlib.h>
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#else
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extern void exit OF((int));
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#endif
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#if defined(VMS) || defined(RISCOS)
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# define TESTFILE "foo-gz"
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#else
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# define TESTFILE "foo.gz"
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#endif
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#define CHECK_ERR(err, msg) { \
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if (err != Z_OK) { \
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fprintf(stderr, "%s error: %d\n", msg, err); \
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exit(1); \
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} \
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}
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const char hello[] = "hello, hello!";
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/* "hello world" would be more standard, but the repeated "hello"
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* stresses the compression code better, sorry...
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*/
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const char dictionary[] = "hello";
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uLong dictId; /* Adler32 value of the dictionary */
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void test_compress OF((Byte *compr, uLong comprLen,
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Byte *uncompr, uLong uncomprLen));
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void test_gzio OF((const char *out, const char *in,
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Byte *uncompr, int uncomprLen));
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void test_deflate OF((Byte *compr, uLong comprLen));
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void test_inflate OF((Byte *compr, uLong comprLen,
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Byte *uncompr, uLong uncomprLen));
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void test_large_deflate OF((Byte *compr, uLong comprLen,
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Byte *uncompr, uLong uncomprLen));
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void test_large_inflate OF((Byte *compr, uLong comprLen,
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Byte *uncompr, uLong uncomprLen));
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void test_flush OF((Byte *compr, uLong *comprLen));
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void test_sync OF((Byte *compr, uLong comprLen,
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Byte *uncompr, uLong uncomprLen));
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void test_dict_deflate OF((Byte *compr, uLong comprLen));
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void test_dict_inflate OF((Byte *compr, uLong comprLen,
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Byte *uncompr, uLong uncomprLen));
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int main OF((int argc, char *argv[]));
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/* ===========================================================================
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* Test compress() and uncompress()
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*/
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void test_compress(compr, comprLen, uncompr, uncomprLen)
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Byte *compr, *uncompr;
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uLong comprLen, uncomprLen;
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{
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int err;
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uLong len = strlen(hello)+1;
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err = compress(compr, &comprLen, (const Bytef*)hello, len);
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CHECK_ERR(err, "compress");
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strcpy((char*)uncompr, "garbage");
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err = uncompress(uncompr, &uncomprLen, compr, comprLen);
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CHECK_ERR(err, "uncompress");
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if (strcmp((char*)uncompr, hello)) {
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fprintf(stderr, "bad uncompress\n");
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exit(1);
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} else {
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printf("uncompress(): %s\n", (char *)uncompr);
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}
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}
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/* ===========================================================================
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* Test read/write of .gz files
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*/
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void test_gzio(out, in, uncompr, uncomprLen)
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const char *out; /* compressed output file */
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const char *in; /* compressed input file */
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Byte *uncompr;
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int uncomprLen;
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{
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int err;
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int len = strlen(hello)+1;
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gzFile file;
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z_off_t pos;
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file = gzopen(out, "wb");
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if (file == NULL) {
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fprintf(stderr, "gzopen error\n");
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exit(1);
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}
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gzputc(file, 'h');
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if (gzputs(file, "ello") != 4) {
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fprintf(stderr, "gzputs err: %s\n", gzerror(file, &err));
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exit(1);
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}
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if (gzprintf(file, ", %s!", "hello") != 8) {
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fprintf(stderr, "gzprintf err: %s\n", gzerror(file, &err));
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exit(1);
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}
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gzseek(file, 1L, SEEK_CUR); /* add one zero byte */
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gzclose(file);
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file = gzopen(in, "rb");
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if (file == NULL) {
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fprintf(stderr, "gzopen error\n");
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}
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strcpy((char*)uncompr, "garbage");
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uncomprLen = gzread(file, uncompr, (unsigned)uncomprLen);
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if (uncomprLen != len) {
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fprintf(stderr, "gzread err: %s\n", gzerror(file, &err));
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exit(1);
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}
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if (strcmp((char*)uncompr, hello)) {
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fprintf(stderr, "bad gzread: %s\n", (char*)uncompr);
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exit(1);
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} else {
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printf("gzread(): %s\n", (char *)uncompr);
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}
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pos = gzseek(file, -8L, SEEK_CUR);
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if (pos != 6 || gztell(file) != pos) {
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fprintf(stderr, "gzseek error, pos=%ld, gztell=%ld\n",
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(long)pos, (long)gztell(file));
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exit(1);
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}
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if (gzgetc(file) != ' ') {
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fprintf(stderr, "gzgetc error\n");
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exit(1);
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}
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gzgets(file, (char*)uncompr, uncomprLen);
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uncomprLen = strlen((char*)uncompr);
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if (uncomprLen != 6) { /* "hello!" */
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fprintf(stderr, "gzgets err after gzseek: %s\n", gzerror(file, &err));
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exit(1);
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}
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if (strcmp((char*)uncompr, hello+7)) {
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fprintf(stderr, "bad gzgets after gzseek\n");
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exit(1);
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} else {
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printf("gzgets() after gzseek: %s\n", (char *)uncompr);
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}
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gzclose(file);
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}
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/* ===========================================================================
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* Test deflate() with small buffers
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*/
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void test_deflate(compr, comprLen)
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Byte *compr;
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uLong comprLen;
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{
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z_stream c_stream; /* compression stream */
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int err;
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int len = strlen(hello)+1;
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c_stream.zalloc = (alloc_func)0;
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c_stream.zfree = (free_func)0;
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c_stream.opaque = (voidpf)0;
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err = deflateInit(&c_stream, Z_DEFAULT_COMPRESSION);
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CHECK_ERR(err, "deflateInit");
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c_stream.next_in = (Bytef*)hello;
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c_stream.next_out = compr;
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while (c_stream.total_in != (uLong)len && c_stream.total_out < comprLen) {
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c_stream.avail_in = c_stream.avail_out = 1; /* force small buffers */
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err = deflate(&c_stream, Z_NO_FLUSH);
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CHECK_ERR(err, "deflate");
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}
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/* Finish the stream, still forcing small buffers: */
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for (;;) {
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c_stream.avail_out = 1;
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err = deflate(&c_stream, Z_FINISH);
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if (err == Z_STREAM_END) break;
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CHECK_ERR(err, "deflate");
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}
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err = deflateEnd(&c_stream);
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CHECK_ERR(err, "deflateEnd");
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}
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/* ===========================================================================
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* Test inflate() with small buffers
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*/
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void test_inflate(compr, comprLen, uncompr, uncomprLen)
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Byte *compr, *uncompr;
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uLong comprLen, uncomprLen;
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{
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int err;
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z_stream d_stream; /* decompression stream */
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strcpy((char*)uncompr, "garbage");
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d_stream.zalloc = (alloc_func)0;
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d_stream.zfree = (free_func)0;
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d_stream.opaque = (voidpf)0;
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d_stream.next_in = compr;
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d_stream.avail_in = 0;
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d_stream.next_out = uncompr;
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err = inflateInit(&d_stream);
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CHECK_ERR(err, "inflateInit");
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while (d_stream.total_out < uncomprLen && d_stream.total_in < comprLen) {
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d_stream.avail_in = d_stream.avail_out = 1; /* force small buffers */
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err = inflate(&d_stream, Z_NO_FLUSH);
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if (err == Z_STREAM_END) break;
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CHECK_ERR(err, "inflate");
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}
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err = inflateEnd(&d_stream);
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CHECK_ERR(err, "inflateEnd");
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if (strcmp((char*)uncompr, hello)) {
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fprintf(stderr, "bad inflate\n");
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exit(1);
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} else {
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printf("inflate(): %s\n", (char *)uncompr);
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}
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}
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/* ===========================================================================
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* Test deflate() with large buffers and dynamic change of compression level
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*/
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void test_large_deflate(compr, comprLen, uncompr, uncomprLen)
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Byte *compr, *uncompr;
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uLong comprLen, uncomprLen;
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{
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z_stream c_stream; /* compression stream */
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int err;
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c_stream.zalloc = (alloc_func)0;
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c_stream.zfree = (free_func)0;
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c_stream.opaque = (voidpf)0;
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| 254 |
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err = deflateInit(&c_stream, Z_BEST_SPEED);
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CHECK_ERR(err, "deflateInit");
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c_stream.next_out = compr;
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c_stream.avail_out = (uInt)comprLen;
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/* At this point, uncompr is still mostly zeroes, so it should compress
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* very well:
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*/
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c_stream.next_in = uncompr;
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c_stream.avail_in = (uInt)uncomprLen;
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err = deflate(&c_stream, Z_NO_FLUSH);
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CHECK_ERR(err, "deflate");
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if (c_stream.avail_in != 0) {
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| 268 |
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fprintf(stderr, "deflate not greedy\n");
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exit(1);
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| 270 |
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}
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| 271 |
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| 272 |
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/* Feed in already compressed data and switch to no compression: */
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deflateParams(&c_stream, Z_NO_COMPRESSION, Z_DEFAULT_STRATEGY);
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c_stream.next_in = compr;
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| 275 |
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c_stream.avail_in = (uInt)comprLen/2;
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| 276 |
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err = deflate(&c_stream, Z_NO_FLUSH);
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| 277 |
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CHECK_ERR(err, "deflate");
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| 279 |
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/* Switch back to compressing mode: */
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deflateParams(&c_stream, Z_BEST_COMPRESSION, Z_FILTERED);
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| 281 |
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c_stream.next_in = uncompr;
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| 282 |
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c_stream.avail_in = (uInt)uncomprLen;
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| 283 |
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err = deflate(&c_stream, Z_NO_FLUSH);
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| 284 |
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CHECK_ERR(err, "deflate");
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| 285 |
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| 286 |
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err = deflate(&c_stream, Z_FINISH);
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| 287 |
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if (err != Z_STREAM_END) {
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| 288 |
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fprintf(stderr, "deflate should report Z_STREAM_END\n");
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| 289 |
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exit(1);
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| 290 |
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}
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| 291 |
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err = deflateEnd(&c_stream);
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| 292 |
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CHECK_ERR(err, "deflateEnd");
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| 293 |
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}
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| 294 |
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| 295 |
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/* ===========================================================================
|
| 296 |
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* Test inflate() with large buffers
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| 297 |
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*/
|
| 298 |
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void test_large_inflate(compr, comprLen, uncompr, uncomprLen)
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| 299 |
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Byte *compr, *uncompr;
|
| 300 |
|
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uLong comprLen, uncomprLen;
|
| 301 |
|
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{
|
| 302 |
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int err;
|
| 303 |
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z_stream d_stream; /* decompression stream */
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| 304 |
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|
| 305 |
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strcpy((char*)uncompr, "garbage");
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| 306 |
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| 307 |
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d_stream.zalloc = (alloc_func)0;
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| 308 |
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d_stream.zfree = (free_func)0;
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| 309 |
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d_stream.opaque = (voidpf)0;
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| 310 |
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| 311 |
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d_stream.next_in = compr;
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| 312 |
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d_stream.avail_in = (uInt)comprLen;
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| 313 |
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| 314 |
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err = inflateInit(&d_stream);
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| 315 |
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CHECK_ERR(err, "inflateInit");
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| 316 |
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| 317 |
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for (;;) {
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| 318 |
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d_stream.next_out = uncompr; /* discard the output */
|
| 319 |
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d_stream.avail_out = (uInt)uncomprLen;
|
| 320 |
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err = inflate(&d_stream, Z_NO_FLUSH);
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| 321 |
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if (err == Z_STREAM_END) break;
|
| 322 |
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CHECK_ERR(err, "large inflate");
|
| 323 |
|
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}
|
| 324 |
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| 325 |
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err = inflateEnd(&d_stream);
|
| 326 |
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CHECK_ERR(err, "inflateEnd");
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| 327 |
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|
| 328 |
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if (d_stream.total_out != 2*uncomprLen + comprLen/2) {
|
| 329 |
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fprintf(stderr, "bad large inflate: %ld\n", d_stream.total_out);
|
| 330 |
|
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exit(1);
|
| 331 |
|
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} else {
|
| 332 |
|
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printf("large_inflate(): OK\n");
|
| 333 |
|
|
}
|
| 334 |
|
|
}
|
| 335 |
|
|
|
| 336 |
|
|
/* ===========================================================================
|
| 337 |
|
|
* Test deflate() with full flush
|
| 338 |
|
|
*/
|
| 339 |
|
|
void test_flush(compr, comprLen)
|
| 340 |
|
|
Byte *compr;
|
| 341 |
|
|
uLong *comprLen;
|
| 342 |
|
|
{
|
| 343 |
|
|
z_stream c_stream; /* compression stream */
|
| 344 |
|
|
int err;
|
| 345 |
|
|
int len = strlen(hello)+1;
|
| 346 |
|
|
|
| 347 |
|
|
c_stream.zalloc = (alloc_func)0;
|
| 348 |
|
|
c_stream.zfree = (free_func)0;
|
| 349 |
|
|
c_stream.opaque = (voidpf)0;
|
| 350 |
|
|
|
| 351 |
|
|
err = deflateInit(&c_stream, Z_DEFAULT_COMPRESSION);
|
| 352 |
|
|
CHECK_ERR(err, "deflateInit");
|
| 353 |
|
|
|
| 354 |
|
|
c_stream.next_in = (Bytef*)hello;
|
| 355 |
|
|
c_stream.next_out = compr;
|
| 356 |
|
|
c_stream.avail_in = 3;
|
| 357 |
|
|
c_stream.avail_out = (uInt)*comprLen;
|
| 358 |
|
|
err = deflate(&c_stream, Z_FULL_FLUSH);
|
| 359 |
|
|
CHECK_ERR(err, "deflate");
|
| 360 |
|
|
|
| 361 |
|
|
compr[3]++; /* force an error in first compressed block */
|
| 362 |
|
|
c_stream.avail_in = len - 3;
|
| 363 |
|
|
|
| 364 |
|
|
err = deflate(&c_stream, Z_FINISH);
|
| 365 |
|
|
if (err != Z_STREAM_END) {
|
| 366 |
|
|
CHECK_ERR(err, "deflate");
|
| 367 |
|
|
}
|
| 368 |
|
|
err = deflateEnd(&c_stream);
|
| 369 |
|
|
CHECK_ERR(err, "deflateEnd");
|
| 370 |
|
|
|
| 371 |
|
|
*comprLen = c_stream.total_out;
|
| 372 |
|
|
}
|
| 373 |
|
|
|
| 374 |
|
|
/* ===========================================================================
|
| 375 |
|
|
* Test inflateSync()
|
| 376 |
|
|
*/
|
| 377 |
|
|
void test_sync(compr, comprLen, uncompr, uncomprLen)
|
| 378 |
|
|
Byte *compr, *uncompr;
|
| 379 |
|
|
uLong comprLen, uncomprLen;
|
| 380 |
|
|
{
|
| 381 |
|
|
int err;
|
| 382 |
|
|
z_stream d_stream; /* decompression stream */
|
| 383 |
|
|
|
| 384 |
|
|
strcpy((char*)uncompr, "garbage");
|
| 385 |
|
|
|
| 386 |
|
|
d_stream.zalloc = (alloc_func)0;
|
| 387 |
|
|
d_stream.zfree = (free_func)0;
|
| 388 |
|
|
d_stream.opaque = (voidpf)0;
|
| 389 |
|
|
|
| 390 |
|
|
d_stream.next_in = compr;
|
| 391 |
|
|
d_stream.avail_in = 2; /* just read the zlib header */
|
| 392 |
|
|
|
| 393 |
|
|
err = inflateInit(&d_stream);
|
| 394 |
|
|
CHECK_ERR(err, "inflateInit");
|
| 395 |
|
|
|
| 396 |
|
|
d_stream.next_out = uncompr;
|
| 397 |
|
|
d_stream.avail_out = (uInt)uncomprLen;
|
| 398 |
|
|
|
| 399 |
|
|
inflate(&d_stream, Z_NO_FLUSH);
|
| 400 |
|
|
CHECK_ERR(err, "inflate");
|
| 401 |
|
|
|
| 402 |
|
|
d_stream.avail_in = (uInt)comprLen-2; /* read all compressed data */
|
| 403 |
|
|
err = inflateSync(&d_stream); /* but skip the damaged part */
|
| 404 |
|
|
CHECK_ERR(err, "inflateSync");
|
| 405 |
|
|
|
| 406 |
|
|
err = inflate(&d_stream, Z_FINISH);
|
| 407 |
|
|
if (err != Z_DATA_ERROR) {
|
| 408 |
|
|
fprintf(stderr, "inflate should report DATA_ERROR\n");
|
| 409 |
|
|
/* Because of incorrect adler32 */
|
| 410 |
|
|
exit(1);
|
| 411 |
|
|
}
|
| 412 |
|
|
err = inflateEnd(&d_stream);
|
| 413 |
|
|
CHECK_ERR(err, "inflateEnd");
|
| 414 |
|
|
|
| 415 |
|
|
printf("after inflateSync(): hel%s\n", (char *)uncompr);
|
| 416 |
|
|
}
|
| 417 |
|
|
|
| 418 |
|
|
/* ===========================================================================
|
| 419 |
|
|
* Test deflate() with preset dictionary
|
| 420 |
|
|
*/
|
| 421 |
|
|
void test_dict_deflate(compr, comprLen)
|
| 422 |
|
|
Byte *compr;
|
| 423 |
|
|
uLong comprLen;
|
| 424 |
|
|
{
|
| 425 |
|
|
z_stream c_stream; /* compression stream */
|
| 426 |
|
|
int err;
|
| 427 |
|
|
|
| 428 |
|
|
c_stream.zalloc = (alloc_func)0;
|
| 429 |
|
|
c_stream.zfree = (free_func)0;
|
| 430 |
|
|
c_stream.opaque = (voidpf)0;
|
| 431 |
|
|
|
| 432 |
|
|
err = deflateInit(&c_stream, Z_BEST_COMPRESSION);
|
| 433 |
|
|
CHECK_ERR(err, "deflateInit");
|
| 434 |
|
|
|
| 435 |
|
|
err = deflateSetDictionary(&c_stream,
|
| 436 |
|
|
(const Bytef*)dictionary, sizeof(dictionary));
|
| 437 |
|
|
CHECK_ERR(err, "deflateSetDictionary");
|
| 438 |
|
|
|
| 439 |
|
|
dictId = c_stream.adler;
|
| 440 |
|
|
c_stream.next_out = compr;
|
| 441 |
|
|
c_stream.avail_out = (uInt)comprLen;
|
| 442 |
|
|
|
| 443 |
|
|
c_stream.next_in = (Bytef*)hello;
|
| 444 |
|
|
c_stream.avail_in = (uInt)strlen(hello)+1;
|
| 445 |
|
|
|
| 446 |
|
|
err = deflate(&c_stream, Z_FINISH);
|
| 447 |
|
|
if (err != Z_STREAM_END) {
|
| 448 |
|
|
fprintf(stderr, "deflate should report Z_STREAM_END\n");
|
| 449 |
|
|
exit(1);
|
| 450 |
|
|
}
|
| 451 |
|
|
err = deflateEnd(&c_stream);
|
| 452 |
|
|
CHECK_ERR(err, "deflateEnd");
|
| 453 |
|
|
}
|
| 454 |
|
|
|
| 455 |
|
|
/* ===========================================================================
|
| 456 |
|
|
* Test inflate() with a preset dictionary
|
| 457 |
|
|
*/
|
| 458 |
|
|
void test_dict_inflate(compr, comprLen, uncompr, uncomprLen)
|
| 459 |
|
|
Byte *compr, *uncompr;
|
| 460 |
|
|
uLong comprLen, uncomprLen;
|
| 461 |
|
|
{
|
| 462 |
|
|
int err;
|
| 463 |
|
|
z_stream d_stream; /* decompression stream */
|
| 464 |
|
|
|
| 465 |
|
|
strcpy((char*)uncompr, "garbage");
|
| 466 |
|
|
|
| 467 |
|
|
d_stream.zalloc = (alloc_func)0;
|
| 468 |
|
|
d_stream.zfree = (free_func)0;
|
| 469 |
|
|
d_stream.opaque = (voidpf)0;
|
| 470 |
|
|
|
| 471 |
|
|
d_stream.next_in = compr;
|
| 472 |
|
|
d_stream.avail_in = (uInt)comprLen;
|
| 473 |
|
|
|
| 474 |
|
|
err = inflateInit(&d_stream);
|
| 475 |
|
|
CHECK_ERR(err, "inflateInit");
|
| 476 |
|
|
|
| 477 |
|
|
d_stream.next_out = uncompr;
|
| 478 |
|
|
d_stream.avail_out = (uInt)uncomprLen;
|
| 479 |
|
|
|
| 480 |
|
|
for (;;) {
|
| 481 |
|
|
err = inflate(&d_stream, Z_NO_FLUSH);
|
| 482 |
|
|
if (err == Z_STREAM_END) break;
|
| 483 |
|
|
if (err == Z_NEED_DICT) {
|
| 484 |
|
|
if (d_stream.adler != dictId) {
|
| 485 |
|
|
fprintf(stderr, "unexpected dictionary");
|
| 486 |
|
|
exit(1);
|
| 487 |
|
|
}
|
| 488 |
|
|
err = inflateSetDictionary(&d_stream, (const Bytef*)dictionary,
|
| 489 |
|
|
sizeof(dictionary));
|
| 490 |
|
|
}
|
| 491 |
|
|
CHECK_ERR(err, "inflate with dict");
|
| 492 |
|
|
}
|
| 493 |
|
|
|
| 494 |
|
|
err = inflateEnd(&d_stream);
|
| 495 |
|
|
CHECK_ERR(err, "inflateEnd");
|
| 496 |
|
|
|
| 497 |
|
|
if (strcmp((char*)uncompr, hello)) {
|
| 498 |
|
|
fprintf(stderr, "bad inflate with dict\n");
|
| 499 |
|
|
exit(1);
|
| 500 |
|
|
} else {
|
| 501 |
|
|
printf("inflate with dictionary: %s\n", (char *)uncompr);
|
| 502 |
|
|
}
|
| 503 |
|
|
}
|
| 504 |
|
|
|
| 505 |
|
|
/* ===========================================================================
|
| 506 |
|
|
* Usage: example [output.gz [input.gz]]
|
| 507 |
|
|
*/
|
| 508 |
|
|
|
| 509 |
|
|
int main(argc, argv)
|
| 510 |
|
|
int argc;
|
| 511 |
|
|
char *argv[];
|
| 512 |
|
|
{
|
| 513 |
|
|
Byte *compr, *uncompr;
|
| 514 |
|
|
uLong comprLen = 10000*sizeof(int); /* don't overflow on MSDOS */
|
| 515 |
|
|
uLong uncomprLen = comprLen;
|
| 516 |
|
|
static const char* myVersion = ZLIB_VERSION;
|
| 517 |
|
|
|
| 518 |
|
|
if (zlibVersion()[0] != myVersion[0]) {
|
| 519 |
|
|
fprintf(stderr, "incompatible zlib version\n");
|
| 520 |
|
|
exit(1);
|
| 521 |
|
|
|
| 522 |
|
|
} else if (strcmp(zlibVersion(), ZLIB_VERSION) != 0) {
|
| 523 |
|
|
fprintf(stderr, "warning: different zlib version\n");
|
| 524 |
|
|
}
|
| 525 |
|
|
|
| 526 |
|
|
compr = (Byte*)calloc((uInt)comprLen, 1);
|
| 527 |
|
|
uncompr = (Byte*)calloc((uInt)uncomprLen, 1);
|
| 528 |
|
|
/* compr and uncompr are cleared to avoid reading uninitialized
|
| 529 |
|
|
* data and to ensure that uncompr compresses well.
|
| 530 |
|
|
*/
|
| 531 |
|
|
if (compr == Z_NULL || uncompr == Z_NULL) {
|
| 532 |
|
|
printf("out of memory\n");
|
| 533 |
|
|
exit(1);
|
| 534 |
|
|
}
|
| 535 |
|
|
test_compress(compr, comprLen, uncompr, uncomprLen);
|
| 536 |
|
|
|
| 537 |
|
|
test_gzio((argc > 1 ? argv[1] : TESTFILE),
|
| 538 |
|
|
(argc > 2 ? argv[2] : TESTFILE),
|
| 539 |
|
|
uncompr, (int)uncomprLen);
|
| 540 |
|
|
|
| 541 |
|
|
test_deflate(compr, comprLen);
|
| 542 |
|
|
test_inflate(compr, comprLen, uncompr, uncomprLen);
|
| 543 |
|
|
|
| 544 |
|
|
test_large_deflate(compr, comprLen, uncompr, uncomprLen);
|
| 545 |
|
|
test_large_inflate(compr, comprLen, uncompr, uncomprLen);
|
| 546 |
|
|
|
| 547 |
|
|
test_flush(compr, &comprLen);
|
| 548 |
|
|
test_sync(compr, comprLen, uncompr, uncomprLen);
|
| 549 |
|
|
comprLen = uncomprLen;
|
| 550 |
|
|
|
| 551 |
|
|
test_dict_deflate(compr, comprLen);
|
| 552 |
|
|
test_dict_inflate(compr, comprLen, uncompr, uncomprLen);
|
| 553 |
|
|
|
| 554 |
|
|
exit(0);
|
| 555 |
|
|
return 0; /* to avoid warning */
|
| 556 |
|
|
}
|
