example.c (e37bb444aa945ed0725766e986698a09bd61b1b2) example.c (4717628ed859513a3262ea68259d0605f39de0b3)
1/* example.c -- usage example of the zlib compression library
2 * Copyright (C) 1995-2006, 2011, 2016 Jean-loup Gailly
3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */
5
6/* @(#) $Id$ */
7
8#include "zlib.h"

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29static z_const char hello[] = "hello, hello!";
30/* "hello world" would be more standard, but the repeated "hello"
31 * stresses the compression code better, sorry...
32 */
33
34static const char dictionary[] = "hello";
35static uLong dictId; /* Adler32 value of the dictionary */
36
1/* example.c -- usage example of the zlib compression library
2 * Copyright (C) 1995-2006, 2011, 2016 Jean-loup Gailly
3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */
5
6/* @(#) $Id$ */
7
8#include "zlib.h"

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29static z_const char hello[] = "hello, hello!";
30/* "hello world" would be more standard, but the repeated "hello"
31 * stresses the compression code better, sorry...
32 */
33
34static const char dictionary[] = "hello";
35static uLong dictId; /* Adler32 value of the dictionary */
36
37void test_deflate OF((Byte *compr, uLong comprLen));
38void test_inflate OF((Byte *compr, uLong comprLen,
39 Byte *uncompr, uLong uncomprLen));
40void test_large_deflate OF((Byte *compr, uLong comprLen,
41 Byte *uncompr, uLong uncomprLen));
42void test_large_inflate OF((Byte *compr, uLong comprLen,
43 Byte *uncompr, uLong uncomprLen));
44void test_flush OF((Byte *compr, uLong *comprLen));
45void test_sync OF((Byte *compr, uLong comprLen,
46 Byte *uncompr, uLong uncomprLen));
47void test_dict_deflate OF((Byte *compr, uLong comprLen));
48void test_dict_inflate OF((Byte *compr, uLong comprLen,
49 Byte *uncompr, uLong uncomprLen));
50int main OF((int argc, char *argv[]));
51
52
53#ifdef Z_SOLO
54
37#ifdef Z_SOLO
38
55void *myalloc OF((void *, unsigned, unsigned));
56void myfree OF((void *, void *));
57
58void *myalloc(q, n, m)
59 void *q;
60 unsigned n, m;
61{
39void *myalloc(void *q, unsigned n, unsigned m) {
62 (void)q;
63 return calloc(n, m);
64}
65
40 (void)q;
41 return calloc(n, m);
42}
43
66void myfree(void *q, void *p)
67{
44void myfree(void *q, void *p) {
68 (void)q;
69 free(p);
70}
71
72static alloc_func zalloc = myalloc;
73static free_func zfree = myfree;
74
75#else /* !Z_SOLO */
76
77static alloc_func zalloc = (alloc_func)0;
78static free_func zfree = (free_func)0;
79
45 (void)q;
46 free(p);
47}
48
49static alloc_func zalloc = myalloc;
50static free_func zfree = myfree;
51
52#else /* !Z_SOLO */
53
54static alloc_func zalloc = (alloc_func)0;
55static free_func zfree = (free_func)0;
56
80void test_compress OF((Byte *compr, uLong comprLen,
81 Byte *uncompr, uLong uncomprLen));
82void test_gzio OF((const char *fname,
83 Byte *uncompr, uLong uncomprLen));
84
85/* ===========================================================================
86 * Test compress() and uncompress()
87 */
57/* ===========================================================================
58 * Test compress() and uncompress()
59 */
88void test_compress(compr, comprLen, uncompr, uncomprLen)
89 Byte *compr, *uncompr;
90 uLong comprLen, uncomprLen;
91{
60void test_compress(Byte *compr, uLong comprLen, Byte *uncompr,
61 uLong uncomprLen) {
92 int err;
93 uLong len = (uLong)strlen(hello)+1;
94
95 err = compress(compr, &comprLen, (const Bytef*)hello, len);
96 CHECK_ERR(err, "compress");
97
98 strcpy((char*)uncompr, "garbage");
99

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106 } else {
107 printf("uncompress(): %s\n", (char *)uncompr);
108 }
109}
110
111/* ===========================================================================
112 * Test read/write of .gz files
113 */
62 int err;
63 uLong len = (uLong)strlen(hello)+1;
64
65 err = compress(compr, &comprLen, (const Bytef*)hello, len);
66 CHECK_ERR(err, "compress");
67
68 strcpy((char*)uncompr, "garbage");
69

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76 } else {
77 printf("uncompress(): %s\n", (char *)uncompr);
78 }
79}
80
81/* ===========================================================================
82 * Test read/write of .gz files
83 */
114void test_gzio(fname, uncompr, uncomprLen)
115 const char *fname; /* compressed file name */
116 Byte *uncompr;
117 uLong uncomprLen;
118{
84void test_gzio(const char *fname, Byte *uncompr, uLong uncomprLen) {
119#ifdef NO_GZCOMPRESS
120 fprintf(stderr, "NO_GZCOMPRESS -- gz* functions cannot compress\n");
121#else
122 int err;
123 int len = (int)strlen(hello)+1;
124 gzFile file;
125 z_off_t pos;
126

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192#endif
193}
194
195#endif /* Z_SOLO */
196
197/* ===========================================================================
198 * Test deflate() with small buffers
199 */
85#ifdef NO_GZCOMPRESS
86 fprintf(stderr, "NO_GZCOMPRESS -- gz* functions cannot compress\n");
87#else
88 int err;
89 int len = (int)strlen(hello)+1;
90 gzFile file;
91 z_off_t pos;
92

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158#endif
159}
160
161#endif /* Z_SOLO */
162
163/* ===========================================================================
164 * Test deflate() with small buffers
165 */
200void test_deflate(compr, comprLen)
201 Byte *compr;
202 uLong comprLen;
203{
166void test_deflate(Byte *compr, uLong comprLen) {
204 z_stream c_stream; /* compression stream */
205 int err;
206 uLong len = (uLong)strlen(hello)+1;
207
208 c_stream.zalloc = zalloc;
209 c_stream.zfree = zfree;
210 c_stream.opaque = (voidpf)0;
211

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230
231 err = deflateEnd(&c_stream);
232 CHECK_ERR(err, "deflateEnd");
233}
234
235/* ===========================================================================
236 * Test inflate() with small buffers
237 */
167 z_stream c_stream; /* compression stream */
168 int err;
169 uLong len = (uLong)strlen(hello)+1;
170
171 c_stream.zalloc = zalloc;
172 c_stream.zfree = zfree;
173 c_stream.opaque = (voidpf)0;
174

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193
194 err = deflateEnd(&c_stream);
195 CHECK_ERR(err, "deflateEnd");
196}
197
198/* ===========================================================================
199 * Test inflate() with small buffers
200 */
238void test_inflate(compr, comprLen, uncompr, uncomprLen)
239 Byte *compr, *uncompr;
240 uLong comprLen, uncomprLen;
241{
201void test_inflate(Byte *compr, uLong comprLen, Byte *uncompr,
202 uLong uncomprLen) {
242 int err;
243 z_stream d_stream; /* decompression stream */
244
245 strcpy((char*)uncompr, "garbage");
246
247 d_stream.zalloc = zalloc;
248 d_stream.zfree = zfree;
249 d_stream.opaque = (voidpf)0;

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271 } else {
272 printf("inflate(): %s\n", (char *)uncompr);
273 }
274}
275
276/* ===========================================================================
277 * Test deflate() with large buffers and dynamic change of compression level
278 */
203 int err;
204 z_stream d_stream; /* decompression stream */
205
206 strcpy((char*)uncompr, "garbage");
207
208 d_stream.zalloc = zalloc;
209 d_stream.zfree = zfree;
210 d_stream.opaque = (voidpf)0;

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232 } else {
233 printf("inflate(): %s\n", (char *)uncompr);
234 }
235}
236
237/* ===========================================================================
238 * Test deflate() with large buffers and dynamic change of compression level
239 */
279void test_large_deflate(compr, comprLen, uncompr, uncomprLen)
280 Byte *compr, *uncompr;
281 uLong comprLen, uncomprLen;
282{
240void test_large_deflate(Byte *compr, uLong comprLen, Byte *uncompr,
241 uLong uncomprLen) {
283 z_stream c_stream; /* compression stream */
284 int err;
285
286 c_stream.zalloc = zalloc;
287 c_stream.zfree = zfree;
288 c_stream.opaque = (voidpf)0;
289
290 err = deflateInit(&c_stream, Z_BEST_SPEED);

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303 if (c_stream.avail_in != 0) {
304 fprintf(stderr, "deflate not greedy\n");
305 exit(1);
306 }
307
308 /* Feed in already compressed data and switch to no compression: */
309 deflateParams(&c_stream, Z_NO_COMPRESSION, Z_DEFAULT_STRATEGY);
310 c_stream.next_in = compr;
242 z_stream c_stream; /* compression stream */
243 int err;
244
245 c_stream.zalloc = zalloc;
246 c_stream.zfree = zfree;
247 c_stream.opaque = (voidpf)0;
248
249 err = deflateInit(&c_stream, Z_BEST_SPEED);

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262 if (c_stream.avail_in != 0) {
263 fprintf(stderr, "deflate not greedy\n");
264 exit(1);
265 }
266
267 /* Feed in already compressed data and switch to no compression: */
268 deflateParams(&c_stream, Z_NO_COMPRESSION, Z_DEFAULT_STRATEGY);
269 c_stream.next_in = compr;
311 c_stream.avail_in = (uInt)comprLen/2;
270 c_stream.avail_in = (uInt)uncomprLen/2;
312 err = deflate(&c_stream, Z_NO_FLUSH);
313 CHECK_ERR(err, "deflate");
314
315 /* Switch back to compressing mode: */
316 deflateParams(&c_stream, Z_BEST_COMPRESSION, Z_FILTERED);
317 c_stream.next_in = uncompr;
318 c_stream.avail_in = (uInt)uncomprLen;
319 err = deflate(&c_stream, Z_NO_FLUSH);

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326 }
327 err = deflateEnd(&c_stream);
328 CHECK_ERR(err, "deflateEnd");
329}
330
331/* ===========================================================================
332 * Test inflate() with large buffers
333 */
271 err = deflate(&c_stream, Z_NO_FLUSH);
272 CHECK_ERR(err, "deflate");
273
274 /* Switch back to compressing mode: */
275 deflateParams(&c_stream, Z_BEST_COMPRESSION, Z_FILTERED);
276 c_stream.next_in = uncompr;
277 c_stream.avail_in = (uInt)uncomprLen;
278 err = deflate(&c_stream, Z_NO_FLUSH);

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285 }
286 err = deflateEnd(&c_stream);
287 CHECK_ERR(err, "deflateEnd");
288}
289
290/* ===========================================================================
291 * Test inflate() with large buffers
292 */
334void test_large_inflate(compr, comprLen, uncompr, uncomprLen)
335 Byte *compr, *uncompr;
336 uLong comprLen, uncomprLen;
337{
293void test_large_inflate(Byte *compr, uLong comprLen, Byte *uncompr,
294 uLong uncomprLen) {
338 int err;
339 z_stream d_stream; /* decompression stream */
340
341 strcpy((char*)uncompr, "garbage");
342
343 d_stream.zalloc = zalloc;
344 d_stream.zfree = zfree;
345 d_stream.opaque = (voidpf)0;

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356 err = inflate(&d_stream, Z_NO_FLUSH);
357 if (err == Z_STREAM_END) break;
358 CHECK_ERR(err, "large inflate");
359 }
360
361 err = inflateEnd(&d_stream);
362 CHECK_ERR(err, "inflateEnd");
363
295 int err;
296 z_stream d_stream; /* decompression stream */
297
298 strcpy((char*)uncompr, "garbage");
299
300 d_stream.zalloc = zalloc;
301 d_stream.zfree = zfree;
302 d_stream.opaque = (voidpf)0;

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313 err = inflate(&d_stream, Z_NO_FLUSH);
314 if (err == Z_STREAM_END) break;
315 CHECK_ERR(err, "large inflate");
316 }
317
318 err = inflateEnd(&d_stream);
319 CHECK_ERR(err, "inflateEnd");
320
364 if (d_stream.total_out != 2*uncomprLen + comprLen/2) {
321 if (d_stream.total_out != 2*uncomprLen + uncomprLen/2) {
365 fprintf(stderr, "bad large inflate: %ld\n", d_stream.total_out);
366 exit(1);
367 } else {
368 printf("large_inflate(): OK\n");
369 }
370}
371
372/* ===========================================================================
373 * Test deflate() with full flush
374 */
322 fprintf(stderr, "bad large inflate: %ld\n", d_stream.total_out);
323 exit(1);
324 } else {
325 printf("large_inflate(): OK\n");
326 }
327}
328
329/* ===========================================================================
330 * Test deflate() with full flush
331 */
375void test_flush(compr, comprLen)
376 Byte *compr;
377 uLong *comprLen;
378{
332void test_flush(Byte *compr, uLong *comprLen) {
379 z_stream c_stream; /* compression stream */
380 int err;
381 uInt len = (uInt)strlen(hello)+1;
382
383 c_stream.zalloc = zalloc;
384 c_stream.zfree = zfree;
385 c_stream.opaque = (voidpf)0;
386

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405 CHECK_ERR(err, "deflateEnd");
406
407 *comprLen = c_stream.total_out;
408}
409
410/* ===========================================================================
411 * Test inflateSync()
412 */
333 z_stream c_stream; /* compression stream */
334 int err;
335 uInt len = (uInt)strlen(hello)+1;
336
337 c_stream.zalloc = zalloc;
338 c_stream.zfree = zfree;
339 c_stream.opaque = (voidpf)0;
340

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359 CHECK_ERR(err, "deflateEnd");
360
361 *comprLen = c_stream.total_out;
362}
363
364/* ===========================================================================
365 * Test inflateSync()
366 */
413void test_sync(compr, comprLen, uncompr, uncomprLen)
414 Byte *compr, *uncompr;
415 uLong comprLen, uncomprLen;
416{
367void test_sync(Byte *compr, uLong comprLen, Byte *uncompr, uLong uncomprLen) {
417 int err;
418 z_stream d_stream; /* decompression stream */
419
420 strcpy((char*)uncompr, "garbage");
421
422 d_stream.zalloc = zalloc;
423 d_stream.zfree = zfree;
424 d_stream.opaque = (voidpf)0;

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448 CHECK_ERR(err, "inflateEnd");
449
450 printf("after inflateSync(): hel%s\n", (char *)uncompr);
451}
452
453/* ===========================================================================
454 * Test deflate() with preset dictionary
455 */
368 int err;
369 z_stream d_stream; /* decompression stream */
370
371 strcpy((char*)uncompr, "garbage");
372
373 d_stream.zalloc = zalloc;
374 d_stream.zfree = zfree;
375 d_stream.opaque = (voidpf)0;

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399 CHECK_ERR(err, "inflateEnd");
400
401 printf("after inflateSync(): hel%s\n", (char *)uncompr);
402}
403
404/* ===========================================================================
405 * Test deflate() with preset dictionary
406 */
456void test_dict_deflate(compr, comprLen)
457 Byte *compr;
458 uLong comprLen;
459{
407void test_dict_deflate(Byte *compr, uLong comprLen) {
460 z_stream c_stream; /* compression stream */
461 int err;
462
463 c_stream.zalloc = zalloc;
464 c_stream.zfree = zfree;
465 c_stream.opaque = (voidpf)0;
466
467 err = deflateInit(&c_stream, Z_BEST_COMPRESSION);

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485 }
486 err = deflateEnd(&c_stream);
487 CHECK_ERR(err, "deflateEnd");
488}
489
490/* ===========================================================================
491 * Test inflate() with a preset dictionary
492 */
408 z_stream c_stream; /* compression stream */
409 int err;
410
411 c_stream.zalloc = zalloc;
412 c_stream.zfree = zfree;
413 c_stream.opaque = (voidpf)0;
414
415 err = deflateInit(&c_stream, Z_BEST_COMPRESSION);

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433 }
434 err = deflateEnd(&c_stream);
435 CHECK_ERR(err, "deflateEnd");
436}
437
438/* ===========================================================================
439 * Test inflate() with a preset dictionary
440 */
493void test_dict_inflate(compr, comprLen, uncompr, uncomprLen)
494 Byte *compr, *uncompr;
495 uLong comprLen, uncomprLen;
496{
441void test_dict_inflate(Byte *compr, uLong comprLen, Byte *uncompr,
442 uLong uncomprLen) {
497 int err;
498 z_stream d_stream; /* decompression stream */
499
500 strcpy((char*)uncompr, "garbage");
501
502 d_stream.zalloc = zalloc;
503 d_stream.zfree = zfree;
504 d_stream.opaque = (voidpf)0;

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536 printf("inflate with dictionary: %s\n", (char *)uncompr);
537 }
538}
539
540/* ===========================================================================
541 * Usage: example [output.gz [input.gz]]
542 */
543
443 int err;
444 z_stream d_stream; /* decompression stream */
445
446 strcpy((char*)uncompr, "garbage");
447
448 d_stream.zalloc = zalloc;
449 d_stream.zfree = zfree;
450 d_stream.opaque = (voidpf)0;

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482 printf("inflate with dictionary: %s\n", (char *)uncompr);
483 }
484}
485
486/* ===========================================================================
487 * Usage: example [output.gz [input.gz]]
488 */
489
544int main(argc, argv)
545 int argc;
546 char *argv[];
547{
490int main(int argc, char *argv[]) {
548 Byte *compr, *uncompr;
491 Byte *compr, *uncompr;
549 uLong comprLen = 10000*sizeof(int); /* don't overflow on MSDOS */
550 uLong uncomprLen = comprLen;
492 uLong uncomprLen = 20000;
493 uLong comprLen = 3 * uncomprLen;
551 static const char* myVersion = ZLIB_VERSION;
552
553 if (zlibVersion()[0] != myVersion[0]) {
554 fprintf(stderr, "incompatible zlib version\n");
555 exit(1);
556
557 } else if (strcmp(zlibVersion(), ZLIB_VERSION) != 0) {
558 fprintf(stderr, "warning: different zlib version linked: %s\n",

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585 test_deflate(compr, comprLen);
586 test_inflate(compr, comprLen, uncompr, uncomprLen);
587
588 test_large_deflate(compr, comprLen, uncompr, uncomprLen);
589 test_large_inflate(compr, comprLen, uncompr, uncomprLen);
590
591 test_flush(compr, &comprLen);
592 test_sync(compr, comprLen, uncompr, uncomprLen);
494 static const char* myVersion = ZLIB_VERSION;
495
496 if (zlibVersion()[0] != myVersion[0]) {
497 fprintf(stderr, "incompatible zlib version\n");
498 exit(1);
499
500 } else if (strcmp(zlibVersion(), ZLIB_VERSION) != 0) {
501 fprintf(stderr, "warning: different zlib version linked: %s\n",

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528 test_deflate(compr, comprLen);
529 test_inflate(compr, comprLen, uncompr, uncomprLen);
530
531 test_large_deflate(compr, comprLen, uncompr, uncomprLen);
532 test_large_inflate(compr, comprLen, uncompr, uncomprLen);
533
534 test_flush(compr, &comprLen);
535 test_sync(compr, comprLen, uncompr, uncomprLen);
593 comprLen = uncomprLen;
536 comprLen = 3 * uncomprLen;
594
595 test_dict_deflate(compr, comprLen);
596 test_dict_inflate(compr, comprLen, uncompr, uncomprLen);
597
598 free(compr);
599 free(uncompr);
600
601 return 0;
602}
537
538 test_dict_deflate(compr, comprLen);
539 test_dict_inflate(compr, comprLen, uncompr, uncomprLen);
540
541 free(compr);
542 free(uncompr);
543
544 return 0;
545}