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author darius
date Sat, 06 Dec 1997 05:41:29 +0000
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2:fba0b6e6cdc7 3:5a977ccbc7a9
1 /* example.c -- usage example of the zlib compression library
2 * Copyright (C) 1995 Jean-loup Gailly.
3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */
5
6 /* $Id: example.c,v 1.1.1.1 1997/12/06 05:41:36 darius Exp $ */
7
8 #include <stdio.h>
9 #include "zlib.h"
10
11 #ifdef STDC
12 # include <string.h>
13 #endif
14
15 #ifndef __GO32__
16 extern void exit __P((int));
17 #endif
18
19 #define BUFLEN 4096
20
21 #define local static
22 /* For MSDOS and other systems with limitation on stack size. For Unix,
23 #define local
24 works also.
25 */
26
27 #define CHECK_ERR(err, msg) { \
28 if (err != Z_OK) { \
29 fprintf(stderr, "%s error: %d\n", msg, err); \
30 exit(1); \
31 } \
32 }
33
34 char *hello = "hello world";
35
36 void test_compress __P((void));
37 void test_gzio __P((char *out, char *in));
38 void test_deflate __P((Byte compr[]));
39 void test_inflate __P((Byte compr[]));
40 void main __P((int argc, char *argv[]));
41
42 /* ===========================================================================
43 * Test compress() and uncompress()
44 */
45 void test_compress()
46 {
47 local Byte compr[BUFLEN];
48 uLong comprLen = sizeof(compr);
49 local Byte uncompr[BUFLEN];
50 uLong uncomprLen = sizeof(uncompr);
51 int err;
52 uLong len = strlen(hello)+1;
53
54 err = compress(compr, &comprLen, (Byte*)hello, len);
55 CHECK_ERR(err, "compress");
56
57 strcpy((char*)uncompr, "garbage");
58
59 err = uncompress(uncompr, &uncomprLen, compr, comprLen);
60 CHECK_ERR(err, "uncompress");
61
62 if (strcmp((char*)uncompr, hello)) {
63 fprintf(stderr, "bad uncompress\n");
64 } else {
65 printf("uncompress(): %s\n", uncompr);
66 }
67 }
68
69 /* ===========================================================================
70 * Test read/write of .gz files
71 */
72 void test_gzio(out, in)
73 char *out; /* output file */
74 char *in; /* input file */
75 {
76 local Byte uncompr[BUFLEN];
77 int uncomprLen = sizeof(uncompr);
78 int err;
79 int len = strlen(hello)+1;
80 gzFile file;
81
82 file = gzopen(out, "wb");
83 if (file == NULL) {
84 fprintf(stderr, "gzopen error\n");
85 exit(1);
86 }
87
88 if (gzwrite(file, hello, len) != len) {
89 fprintf(stderr, "gzwrite err: %s\n", gzerror(file, &err));
90 }
91 gzclose(file);
92
93 file = gzopen(in, "rb");
94 if (file == NULL) {
95 fprintf(stderr, "gzopen error\n");
96 }
97 strcpy((char*)uncompr, "garbage");
98
99 uncomprLen = gzread(file, uncompr, uncomprLen);
100 if (uncomprLen != len) {
101 fprintf(stderr, "gzread err: %s\n", gzerror(file, &err));
102 }
103 gzclose(file);
104
105 if (strcmp((char*)uncompr, hello)) {
106 fprintf(stderr, "bad gzread\n");
107 } else {
108 printf("gzread(): %s\n", uncompr);
109 }
110 }
111
112 /* ===========================================================================
113 * Test deflate() with small buffers
114 */
115 void test_deflate(compr)
116 Byte compr[];
117 {
118 z_stream c_stream; /* compression stream */
119 int err;
120 int len = strlen(hello)+1;
121
122 c_stream.zalloc = (alloc_func)0;
123 c_stream.zfree = (free_func)0;
124
125 err = deflateInit(&c_stream, Z_DEFAULT_COMPRESSION);
126 CHECK_ERR(err, "deflateInit");
127
128 c_stream.next_in = (Byte*)hello;
129 c_stream.next_out = compr;
130
131 while (c_stream.total_in != (uLong)len) {
132 c_stream.avail_in = c_stream.avail_out = 1; /* force small buffers */
133 err = deflate(&c_stream, Z_NO_FLUSH);
134 CHECK_ERR(err, "deflate");
135 }
136 /* Finish the stream, still forcing small buffers: */
137 for (;;) {
138 c_stream.avail_out = 1;
139 err = deflate(&c_stream, Z_FINISH);
140 if (err == Z_STREAM_END) break;
141 CHECK_ERR(err, "deflate");
142 }
143
144 err = deflateEnd(&c_stream);
145 CHECK_ERR(err, "deflateEnd");
146 }
147
148 /* ===========================================================================
149 * Test inflate() with small buffers
150 */
151 void test_inflate(compr)
152 Byte compr[];
153 {
154 local Byte uncompr[BUFLEN];
155 int err;
156 z_stream d_stream; /* decompression stream */
157
158 strcpy((char*)uncompr, "garbage");
159
160 d_stream.zalloc = (alloc_func)0;
161 d_stream.zfree = (free_func)0;
162
163 err = inflateInit(&d_stream);
164 CHECK_ERR(err, "inflateInit");
165
166 d_stream.next_in = compr;
167 d_stream.next_out = uncompr;
168
169 for (;;) {
170 d_stream.avail_in = d_stream.avail_out = 1; /* force small buffers */
171 err = inflate(&d_stream, Z_NO_FLUSH);
172 if (err == Z_STREAM_END) break;
173 CHECK_ERR(err, "inflate");
174 }
175
176 err = inflateEnd(&d_stream);
177 CHECK_ERR(err, "inflateEnd");
178
179 if (strcmp((char*)uncompr, hello)) {
180 fprintf(stderr, "bad inflate\n");
181 } else {
182 printf("inflate(): %s\n", uncompr);
183 }
184 }
185
186 /* ===========================================================================
187 * Test deflate() with full flush
188 */
189 void test_flush(compr)
190 Byte compr[];
191 {
192 z_stream c_stream; /* compression stream */
193 int err;
194 int len = strlen(hello)+1;
195
196 c_stream.zalloc = (alloc_func)0;
197 c_stream.zfree = (free_func)0;
198
199 err = deflateInit(&c_stream, Z_DEFAULT_COMPRESSION);
200 CHECK_ERR(err, "deflateInit");
201
202 c_stream.next_in = (Byte*)hello;
203 c_stream.next_out = compr;
204 c_stream.avail_in = 3;
205 c_stream.avail_out = BUFLEN;
206 err = deflate(&c_stream, Z_FULL_FLUSH);
207 CHECK_ERR(err, "deflate");
208
209 compr[3]++; /* force an error in first compressed block */
210 c_stream.avail_in = len - 3;
211
212 err = deflate(&c_stream, Z_FINISH);
213 if (err != Z_STREAM_END) {
214 CHECK_ERR(err, "deflate");
215 }
216 err = deflateEnd(&c_stream);
217 CHECK_ERR(err, "deflateEnd");
218 }
219
220 /* ===========================================================================
221 * Test inflateSync()
222 */
223 void test_sync(compr)
224 Byte compr[];
225 {
226 local Byte uncompr[BUFLEN];
227 int err;
228 z_stream d_stream; /* decompression stream */
229
230 strcpy((char*)uncompr, "garbage");
231
232 d_stream.zalloc = (alloc_func)0;
233 d_stream.zfree = (free_func)0;
234
235 err = inflateInit(&d_stream);
236 CHECK_ERR(err, "inflateInit");
237
238 d_stream.next_in = compr;
239 d_stream.next_out = uncompr;
240 d_stream.avail_in = 2; /* just read the zlib header */
241 d_stream.avail_out = sizeof(uncompr);
242
243 inflate(&d_stream, Z_NO_FLUSH);
244 CHECK_ERR(err, "inflate");
245
246 d_stream.avail_in = BUFLEN-2; /* let inflate read all compressed data */
247 err = inflateSync(&d_stream); /* skip the damaged part */
248 CHECK_ERR(err, "inflateSync");
249
250 err = inflate(&d_stream, Z_FINISH);
251 if (err != Z_DATA_ERROR) {
252 fprintf(stderr, "inflate should report DATA_ERROR\n");
253 /* Because of incorrect adler32 */
254 }
255 err = inflateEnd(&d_stream);
256 CHECK_ERR(err, "inflateEnd");
257
258 printf("after inflateSync(): hel%s\n", uncompr);
259 }
260
261 /* ===========================================================================
262 * Usage: example [output.gz [input.gz]]
263 */
264
265 void main(argc, argv)
266 int argc;
267 char *argv[];
268 {
269 local Byte compr[BUFLEN];
270
271 if (zlib_version[0] != ZLIB_VERSION[0]) {
272 fprintf(stderr, "incompatible zlib version\n");
273 exit(1);
274
275 } else if (strcmp(zlib_version, ZLIB_VERSION) != 0) {
276 fprintf(stderr, "warning: different zlib version\n");
277 }
278 test_compress();
279
280 test_gzio((argc > 1 ? argv[1] : "foo.gz"),
281 (argc > 2 ? argv[2] : "foo.gz"));
282
283 test_deflate(compr);
284 test_inflate(compr);
285
286 test_flush(compr);
287 test_sync(compr);
288
289 exit(0);
290 }