source: trunk/src/gcc/zlib/example.c@ 869

Last change on this file since 869 was 2, checked in by bird, 23 years ago

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1/* example.c -- usage example of the zlib compression library
2 * Copyright (C) 1995-2002 Jean-loup Gailly.
3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */
5
6/* @(#) $Id: example.c,v 1.1.26.1 2002/03/11 22:18:18 tromey Exp $ */
7
8#include <stdio.h>
9#include "zlib.h"
10
11#ifdef STDC
12# include <string.h>
13# include <stdlib.h>
14#else
15 extern void exit OF((int));
16#endif
17
18#if defined(VMS) || defined(RISCOS)
19# define TESTFILE "foo-gz"
20#else
21# define TESTFILE "foo.gz"
22#endif
23
24#define CHECK_ERR(err, msg) { \
25 if (err != Z_OK) { \
26 fprintf(stderr, "%s error: %d\n", msg, err); \
27 exit(1); \
28 } \
29}
30
31const char hello[] = "hello, hello!";
32/* "hello world" would be more standard, but the repeated "hello"
33 * stresses the compression code better, sorry...
34 */
35
36const char dictionary[] = "hello";
37uLong dictId; /* Adler32 value of the dictionary */
38
39void test_compress OF((Byte *compr, uLong comprLen,
40 Byte *uncompr, uLong uncomprLen));
41void test_gzio OF((const char *out, const char *in,
42 Byte *uncompr, int uncomprLen));
43void test_deflate OF((Byte *compr, uLong comprLen));
44void test_inflate OF((Byte *compr, uLong comprLen,
45 Byte *uncompr, uLong uncomprLen));
46void test_large_deflate OF((Byte *compr, uLong comprLen,
47 Byte *uncompr, uLong uncomprLen));
48void test_large_inflate OF((Byte *compr, uLong comprLen,
49 Byte *uncompr, uLong uncomprLen));
50void test_flush OF((Byte *compr, uLong *comprLen));
51void test_sync OF((Byte *compr, uLong comprLen,
52 Byte *uncompr, uLong uncomprLen));
53void test_dict_deflate OF((Byte *compr, uLong comprLen));
54void test_dict_inflate OF((Byte *compr, uLong comprLen,
55 Byte *uncompr, uLong uncomprLen));
56int main OF((int argc, char *argv[]));
57
58/* ===========================================================================
59 * Test compress() and uncompress()
60 */
61void test_compress(compr, comprLen, uncompr, uncomprLen)
62 Byte *compr, *uncompr;
63 uLong comprLen, uncomprLen;
64{
65 int err;
66 uLong len = strlen(hello)+1;
67
68 err = compress(compr, &comprLen, (const Bytef*)hello, len);
69 CHECK_ERR(err, "compress");
70
71 strcpy((char*)uncompr, "garbage");
72
73 err = uncompress(uncompr, &uncomprLen, compr, comprLen);
74 CHECK_ERR(err, "uncompress");
75
76 if (strcmp((char*)uncompr, hello)) {
77 fprintf(stderr, "bad uncompress\n");
78 exit(1);
79 } else {
80 printf("uncompress(): %s\n", (char *)uncompr);
81 }
82}
83
84/* ===========================================================================
85 * Test read/write of .gz files
86 */
87void test_gzio(out, in, uncompr, uncomprLen)
88 const char *out; /* compressed output file */
89 const char *in; /* compressed input file */
90 Byte *uncompr;
91 int uncomprLen;
92{
93 int err;
94 int len = strlen(hello)+1;
95 gzFile file;
96 z_off_t pos;
97
98 file = gzopen(out, "wb");
99 if (file == NULL) {
100 fprintf(stderr, "gzopen error\n");
101 exit(1);
102 }
103 gzputc(file, 'h');
104 if (gzputs(file, "ello") != 4) {
105 fprintf(stderr, "gzputs err: %s\n", gzerror(file, &err));
106 exit(1);
107 }
108 if (gzprintf(file, ", %s!", "hello") != 8) {
109 fprintf(stderr, "gzprintf err: %s\n", gzerror(file, &err));
110 exit(1);
111 }
112 gzseek(file, 1L, SEEK_CUR); /* add one zero byte */
113 gzclose(file);
114
115 file = gzopen(in, "rb");
116 if (file == NULL) {