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comparison: modules/zlib/src/gzwrite.c

modules/zlib/src/gzwrite.c

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1 /* gzwrite.c -- zlib functions for writing gzip files
2 * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013 Mark Adler
3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */
5
6 #include "gzguts.h"
7
8 /* Local functions */
9 local int gz_init OF((gz_statep));
10 local int gz_comp OF((gz_statep, int));
11 local int gz_zero OF((gz_statep, z_off64_t));
12
13 /* Initialize state for writing a gzip file. Mark initialization by setting
14 state->size to non-zero. Return -1 on failure or 0 on success. */
15 local int gz_init(state)
16 gz_statep state;
17 {
18 int ret;
19 z_streamp strm = &(state->strm);
20
21 /* allocate input buffer */
22 state->in = (unsigned char *)malloc(state->want);
23 if (state->in == NULL) {
24 gz_error(state, Z_MEM_ERROR, "out of memory");
25 return -1;
26 }
27
28 /* only need output buffer and deflate state if compressing */
29 if (!state->direct) {
30 /* allocate output buffer */
31 state->out = (unsigned char *)malloc(state->want);
32 if (state->out == NULL) {
33 free(state->in);
34 gz_error(state, Z_MEM_ERROR, "out of memory");
35 return -1;
36 }
37
38 /* allocate deflate memory, set up for gzip compression */
39 strm->zalloc = Z_NULL;
40 strm->zfree = Z_NULL;
41 strm->opaque = Z_NULL;
42 ret = deflateInit2(strm, state->level, Z_DEFLATED,
43 MAX_WBITS + 16, DEF_MEM_LEVEL, state->strategy);
44 if (ret != Z_OK) {
45 free(state->out);
46 free(state->in);
47 gz_error(state, Z_MEM_ERROR, "out of memory");
48 return -1;
49 }
50 }
51
52 /* mark state as initialized */
53 state->size = state->want;
54
55 /* initialize write buffer if compressing */
56 if (!state->direct) {
57 strm->avail_out = state->size;
58 strm->next_out = state->out;
59 state->x.next = strm->next_out;
60 }
61 return 0;
62 }
63
64 /* Compress whatever is at avail_in and next_in and write to the output file.
65 Return -1 if there is an error writing to the output file, otherwise 0.
66 flush is assumed to be a valid deflate() flush value. If flush is Z_FINISH,
67 then the deflate() state is reset to start a new gzip stream. If gz->direct
68 is true, then simply write to the output file without compressing, and
69 ignore flush. */
70 local int gz_comp(state, flush)
71 gz_statep state;
72 int flush;
73 {
74 int ret, got;
75 unsigned have;
76 z_streamp strm = &(state->strm);
77
78 /* allocate memory if this is the first time through */
79 if (state->size == 0 && gz_init(state) == -1)
80 return -1;
81
82 /* write directly if requested */
83 if (state->direct) {
84 got = write(state->fd, strm->next_in, strm->avail_in);
85 if (got < 0 || (unsigned)got != strm->avail_in) {
86 gz_error(state, Z_ERRNO, zstrerror());
87 return -1;
88 }
89 strm->avail_in = 0;
90 return 0;
91 }
92
93 /* run deflate() on provided input until it produces no more output */
94 ret = Z_OK;
95 do {
96 /* write out current buffer contents if full, or if flushing, but if
97 doing Z_FINISH then don't write until we get to Z_STREAM_END */
98 if (strm->avail_out == 0 || (flush != Z_NO_FLUSH &&
99 (flush != Z_FINISH || ret == Z_STREAM_END))) {
100 have = (unsigned)(strm->next_out - state->x.next);
101 if (have && ((got = write(state->fd, state->x.next, have)) < 0 ||
102 (unsigned)got != have)) {
103 gz_error(state, Z_ERRNO, zstrerror());
104 return -1;
105 }
106 if (strm->avail_out == 0) {
107 strm->avail_out = state->size;
108 strm->next_out = state->out;
109 }
110 state->x.next = strm->next_out;
111 }
112
113 /* compress */
114 have = strm->avail_out;
115 ret = deflate(strm, flush);
116 if (ret == Z_STREAM_ERROR) {
117 gz_error(state, Z_STREAM_ERROR,
118 "internal error: deflate stream corrupt");
119 return -1;
120 }
121 have -= strm->avail_out;
122 } while (have);
123
124 /* if that completed a deflate stream, allow another to start */
125 if (flush == Z_FINISH)
126 deflateReset(strm);
127
128 /* all done, no errors */
129 return 0;
130 }
131
132 /* Compress len zeros to output. Return -1 on error, 0 on success. */
133 local int gz_zero(state, len)
134 gz_statep state;
135 z_off64_t len;
136 {
137 int first;
138 unsigned n;
139 z_streamp strm = &(state->strm);
140
141 /* consume whatever's left in the input buffer */
142 if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
143 return -1;
144
145 /* compress len zeros (len guaranteed > 0) */
146 first = 1;
147 while (len) {
148 n = GT_OFF(state->size) || (z_off64_t)state->size > len ?
149 (unsigned)len : state->size;
150 if (first) {
151 memset(state->in, 0, n);
152 first = 0;
153 }
154 strm->avail_in = n;
155 strm->next_in = state->in;
156 state->x.pos += n;
157 if (gz_comp(state, Z_NO_FLUSH) == -1)
158 return -1;
159 len -= n;
160 }
161 return 0;
162 }
163
164 /* -- see zlib.h -- */
165 int ZEXPORT gzwrite(file, buf, len)
166 gzFile file;
167 voidpc buf;
168 unsigned len;
169 {
170 unsigned put = len;
171 gz_statep state;
172 z_streamp strm;
173
174 /* get internal structure */
175 if (file == NULL)
176 return 0;
177 state = (gz_statep)file;
178 strm = &(state->strm);
179
180 /* check that we're writing and that there's no error */
181 if (state->mode != GZ_WRITE || state->err != Z_OK)
182 return 0;
183
184 /* since an int is returned, make sure len fits in one, otherwise return
185 with an error (this avoids the flaw in the interface) */
186 if ((int)len < 0) {
187 gz_error(state, Z_DATA_ERROR, "requested length does not fit in int");
188 return 0;
189 }
190
191 /* if len is zero, avoid unnecessary operations */
192 if (len == 0)
193 return 0;
194
195 /* allocate memory if this is the first time through */
196 if (state->size == 0 && gz_init(state) == -1)
197 return 0;
198
199 /* check for seek request */
200 if (state->seek) {
201 state->seek = 0;
202 if (gz_zero(state, state->skip) == -1)
203 return 0;
204 }
205
206 /* for small len, copy to input buffer, otherwise compress directly */
207 if (len < state->size) {
208 /* copy to input buffer, compress when full */
209 do {
210 unsigned have, copy;
211
212 if (strm->avail_in == 0)
213 strm->next_in = state->in;
214 have = (unsigned)((strm->next_in + strm->avail_in) - state->in);
215 copy = state->size - have;
216 if (copy > len)
217 copy = len;
218 memcpy(state->in + have, buf, copy);
219 strm->avail_in += copy;
220 state->x.pos += copy;
221 buf = (const char *)buf + copy;
222 len -= copy;
223 if (len && gz_comp(state, Z_NO_FLUSH) == -1)
224 return 0;
225 } while (len);
226 }
227 else {
228 /* consume whatever's left in the input buffer */
229 if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
230 return 0;
231
232 /* directly compress user buffer to file */
233 strm->avail_in = len;
234 strm->next_in = (z_const Bytef *)buf;
235 state->x.pos += len;
236 if (gz_comp(state, Z_NO_FLUSH) == -1)
237 return 0;
238 }
239
240 /* input was all buffered or compressed (put will fit in int) */
241 return (int)put;
242 }
243
244 /* -- see zlib.h -- */
245 int ZEXPORT gzputc(file, c)
246 gzFile file;
247 int c;
248 {
249 unsigned have;
250 unsigned char buf[1];
251 gz_statep state;
252 z_streamp strm;
253
254 /* get internal structure */
255 if (file == NULL)
256 return -1;
257 state = (gz_statep)file;
258 strm = &(state->strm);
259
260 /* check that we're writing and that there's no error */
261 if (state->mode != GZ_WRITE || state->err != Z_OK)
262 return -1;
263
264 /* check for seek request */
265 if (state->seek) {
266 state->seek = 0;
267 if (gz_zero(state, state->skip) == -1)
268 return -1;
269 }
270
271 /* try writing to input buffer for speed (state->size == 0 if buffer not
272 initialized) */
273 if (state->size) {
274 if (strm->avail_in == 0)
275 strm->next_in = state->in;
276 have = (unsigned)((strm->next_in + strm->avail_in) - state->in);
277 if (have < state->size) {
278 state->in[have] = c;
279 strm->avail_in++;
280 state->x.pos++;
281 return c & 0xff;
282 }
283 }
284
285 /* no room in buffer or not initialized, use gz_write() */
286 buf[0] = c;
287 if (gzwrite(file, buf, 1) != 1)
288 return -1;
289 return c & 0xff;
290 }
291
292 /* -- see zlib.h -- */
293 int ZEXPORT gzputs(file, str)
294 gzFile file;
295 const char *str;
296 {
297 int ret;
298 unsigned len;
299
300 /* write string */
301 len = (unsigned)strlen(str);
302 ret = gzwrite(file, str, len);
303 return ret == 0 && len != 0 ? -1 : ret;
304 }
305
306 #if defined(STDC) || defined(Z_HAVE_STDARG_H)
307 #include <stdarg.h>
308
309 /* -- see zlib.h -- */
310 int ZEXPORTVA gzvprintf(gzFile file, const char *format, va_list va)
311 {
312 int size, len;
313 gz_statep state;
314 z_streamp strm;
315
316 /* get internal structure */
317 if (file == NULL)
318 return -1;
319 state = (gz_statep)file;
320 strm = &(state->strm);
321
322 /* check that we're writing and that there's no error */
323 if (state->mode != GZ_WRITE || state->err != Z_OK)
324 return 0;
325
326 /* make sure we have some buffer space */
327 if (state->size == 0 && gz_init(state) == -1)
328 return 0;
329
330 /* check for seek request */
331 if (state->seek) {
332 state->seek = 0;
333 if (gz_zero(state, state->skip) == -1)
334 return 0;
335 }
336
337 /* consume whatever's left in the input buffer */
338 if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
339 return 0;
340
341 /* do the printf() into the input buffer, put length in len */
342 size = (int)(state->size);
343 state->in[size - 1] = 0;
344 #ifdef NO_vsnprintf
345 # ifdef HAS_vsprintf_void
346 (void)vsprintf((char *)(state->in), format, va);
347 for (len = 0; len < size; len++)
348 if (state->in[len] == 0) break;
349 # else
350 len = vsprintf((char *)(state->in), format, va);
351 # endif
352 #else
353 # ifdef HAS_vsnprintf_void
354 (void)vsnprintf((char *)(state->in), size, format, va);
355 len = strlen((char *)(state->in));
356 # else
357 len = vsnprintf((char *)(state->in), size, format, va);
358 # endif
359 #endif
360
361 /* check that printf() results fit in buffer */
362 if (len <= 0 || len >= (int)size || state->in[size - 1] != 0)
363 return 0;
364
365 /* update buffer and position, defer compression until needed */
366 strm->avail_in = (unsigned)len;
367 strm->next_in = state->in;
368 state->x.pos += len;
369 return len;
370 }
371
372 int ZEXPORTVA gzprintf(gzFile file, const char *format, ...)
373 {
374 va_list va;
375 int ret;
376
377 va_start(va, format);
378 ret = gzvprintf(file, format, va);
379 va_end(va);
380 return ret;
381 }
382
383 #else /* !STDC && !Z_HAVE_STDARG_H */
384
385 /* -- see zlib.h -- */
386 int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
387 a11, a12, a13, a14, a15, a16, a17, a18, a19, a20)
388 gzFile file;
389 const char *format;
390 int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
391 a11, a12, a13, a14, a15, a16, a17, a18, a19, a20;
392 {
393 int size, len;
394 gz_statep state;
395 z_streamp strm;
396
397 /* get internal structure */
398 if (file == NULL)
399 return -1;
400 state = (gz_statep)file;
401 strm = &(state->strm);
402
403 /* check that can really pass pointer in ints */
404 if (sizeof(int) != sizeof(void *))
405 return 0;
406
407 /* check that we're writing and that there's no error */
408 if (state->mode != GZ_WRITE || state->err != Z_OK)
409 return 0;
410
411 /* make sure we have some buffer space */
412 if (state->size == 0 && gz_init(state) == -1)
413 return 0;
414
415 /* check for seek request */
416 if (state->seek) {
417 state->seek = 0;
418 if (gz_zero(state, state->skip) == -1)
419 return 0;
420 }
421
422 /* consume whatever's left in the input buffer */
423 if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
424 return 0;
425
426 /* do the printf() into the input buffer, put length in len */
427 size = (int)(state->size);
428 state->in[size - 1] = 0;
429 #ifdef NO_snprintf
430 # ifdef HAS_sprintf_void
431 sprintf((char *)(state->in), format, a1, a2, a3, a4, a5, a6, a7, a8,
432 a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
433 for (len = 0; len < size; len++)
434 if (state->in[len] == 0) break;
435 # else
436 len = sprintf((char *)(state->in), format, a1, a2, a3, a4, a5, a6, a7, a8,
437 a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
438 # endif
439 #else
440 # ifdef HAS_snprintf_void
441 snprintf((char *)(state->in), size, format, a1, a2, a3, a4, a5, a6, a7, a8,
442 a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
443 len = strlen((char *)(state->in));
444 # else
445 len = snprintf((char *)(state->in), size, format, a1, a2, a3, a4, a5, a6,
446 a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18,
447 a19, a20);
448 # endif
449 #endif
450
451 /* check that printf() results fit in buffer */
452 if (len <= 0 || len >= (int)size || state->in[size - 1] != 0)
453 return 0;
454
455 /* update buffer and position, defer compression until needed */
456 strm->avail_in = (unsigned)len;
457 strm->next_in = state->in;
458 state->x.pos += len;
459 return len;
460 }
461
462 #endif
463
464 /* -- see zlib.h -- */
465 int ZEXPORT gzflush(file, flush)
466 gzFile file;
467 int flush;
468 {
469 gz_statep state;
470
471 /* get internal structure */
472 if (file == NULL)
473 return -1;
474 state = (gz_statep)file;
475
476 /* check that we're writing and that there's no error */
477 if (state->mode != GZ_WRITE || state->err != Z_OK)
478 return Z_STREAM_ERROR;
479
480 /* check flush parameter */
481 if (flush < 0 || flush > Z_FINISH)
482 return Z_STREAM_ERROR;
483
484 /* check for seek request */
485 if (state->seek) {
486 state->seek = 0;
487 if (gz_zero(state, state->skip) == -1)
488 return -1;
489 }
490
491 /* compress remaining data with requested flush */
492 gz_comp(state, flush);
493 return state->err;
494 }
495
496 /* -- see zlib.h -- */
497 int ZEXPORT gzsetparams(file, level, strategy)
498 gzFile file;
499 int level;
500 int strategy;
501 {
502 gz_statep state;
503 z_streamp strm;
504
505 /* get internal structure */
506 if (file == NULL)
507 return Z_STREAM_ERROR;
508 state = (gz_statep)file;
509 strm = &(state->strm);
510
511 /* check that we're writing and that there's no error */
512 if (state->mode != GZ_WRITE || state->err != Z_OK)
513 return Z_STREAM_ERROR;
514
515 /* if no change is requested, then do nothing */
516 if (level == state->level && strategy == state->strategy)
517 return Z_OK;
518
519 /* check for seek request */
520 if (state->seek) {
521 state->seek = 0;
522 if (gz_zero(state, state->skip) == -1)
523 return -1;
524 }
525
526 /* change compression parameters for subsequent input */
527 if (state->size) {
528 /* flush previous input with previous parameters before changing */
529 if (strm->avail_in && gz_comp(state, Z_PARTIAL_FLUSH) == -1)
530 return state->err;
531 deflateParams(strm, level, strategy);
532 }
533 state->level = level;
534 state->strategy = strategy;
535 return Z_OK;
536 }
537
538 /* -- see zlib.h -- */
539 int ZEXPORT gzclose_w(file)
540 gzFile file;
541 {
542 int ret = Z_OK;
543 gz_statep state;
544
545 /* get internal structure */
546 if (file == NULL)
547 return Z_STREAM_ERROR;
548 state = (gz_statep)file;
549
550 /* check that we're writing */
551 if (state->mode != GZ_WRITE)
552 return Z_STREAM_ERROR;
553
554 /* check for seek request */
555 if (state->seek) {
556 state->seek = 0;
557 if (gz_zero(state, state->skip) == -1)
558 ret = state->err;
559 }
560
561 /* flush, free memory, and close file */
562 if (gz_comp(state, Z_FINISH) == -1)
563 ret = state->err;
564 if (state->size) {
565 if (!state->direct) {
566 (void)deflateEnd(&(state->strm));
567 free(state->out);
568 }
569 free(state->in);
570 }
571 gz_error(state, Z_OK, NULL);
572 free(state->path);
573 if (close(state->fd) == -1)
574 ret = Z_ERRNO;
575 free(state);
576 return ret;
577 }

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