Line data Source code
1 : /* gzwrite.c -- zlib functions for writing gzip files
2 : * Copyright (C) 2004-2017 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 : local z_size_t gz_write OF((gz_statep, voidpc, z_size_t));
13 :
14 : /* Initialize state for writing a gzip file. Mark initialization by setting
15 : state->size to non-zero. Return -1 on a memory allocation failure, or 0 on
16 : success. */
17 0 : local int gz_init(state)
18 : gz_statep state;
19 : {
20 : int ret;
21 0 : z_streamp strm = &(state->strm);
22 :
23 : /* allocate input buffer (double size for gzprintf) */
24 0 : state->in = (unsigned char *)malloc(state->want << 1);
25 0 : if (state->in == NULL) {
26 0 : gz_error(state, Z_MEM_ERROR, "out of memory");
27 0 : return -1;
28 : }
29 :
30 : /* only need output buffer and deflate state if compressing */
31 0 : if (!state->direct) {
32 : /* allocate output buffer */
33 0 : state->out = (unsigned char *)malloc(state->want);
34 0 : if (state->out == NULL) {
35 0 : free(state->in);
36 0 : gz_error(state, Z_MEM_ERROR, "out of memory");
37 0 : return -1;
38 : }
39 :
40 : /* allocate deflate memory, set up for gzip compression */
41 0 : strm->zalloc = Z_NULL;
42 0 : strm->zfree = Z_NULL;
43 0 : strm->opaque = Z_NULL;
44 0 : ret = deflateInit2(strm, state->level, Z_DEFLATED,
45 : MAX_WBITS + 16, DEF_MEM_LEVEL, state->strategy);
46 0 : if (ret != Z_OK) {
47 0 : free(state->out);
48 0 : free(state->in);
49 0 : gz_error(state, Z_MEM_ERROR, "out of memory");
50 0 : return -1;
51 : }
52 0 : strm->next_in = NULL;
53 : }
54 :
55 : /* mark state as initialized */
56 0 : state->size = state->want;
57 :
58 : /* initialize write buffer if compressing */
59 0 : if (!state->direct) {
60 0 : strm->avail_out = state->size;
61 0 : strm->next_out = state->out;
62 0 : state->x.next = strm->next_out;
63 : }
64 0 : return 0;
65 : }
66 :
67 : /* Compress whatever is at avail_in and next_in and write to the output file.
68 : Return -1 if there is an error writing to the output file or if gz_init()
69 : fails to allocate memory, otherwise 0. flush is assumed to be a valid
70 : deflate() flush value. If flush is Z_FINISH, then the deflate() state is
71 : reset to start a new gzip stream. If gz->direct is true, then simply write
72 : to the output file without compressing, and ignore flush. */
73 0 : local int gz_comp(state, flush)
74 : gz_statep state;
75 : int flush;
76 : {
77 : int ret, writ;
78 0 : unsigned have, put, max = ((unsigned)-1 >> 2) + 1;
79 0 : z_streamp strm = &(state->strm);
80 :
81 : /* allocate memory if this is the first time through */
82 0 : if (state->size == 0 && gz_init(state) == -1)
83 0 : return -1;
84 :
85 : /* write directly if requested */
86 0 : if (state->direct) {
87 0 : while (strm->avail_in) {
88 0 : put = strm->avail_in > max ? max : strm->avail_in;
89 0 : writ = write(state->fd, strm->next_in, put);
90 0 : if (writ < 0) {
91 0 : gz_error(state, Z_ERRNO, zstrerror());
92 0 : return -1;
93 : }
94 0 : strm->avail_in -= (unsigned)writ;
95 0 : strm->next_in += writ;
96 : }
97 0 : return 0;
98 : }
99 :
100 : /* run deflate() on provided input until it produces no more output */
101 0 : ret = Z_OK;
102 : do {
103 : /* write out current buffer contents if full, or if flushing, but if
104 : doing Z_FINISH then don't write until we get to Z_STREAM_END */
105 0 : if (strm->avail_out == 0 || (flush != Z_NO_FLUSH &&
106 0 : (flush != Z_FINISH || ret == Z_STREAM_END))) {
107 0 : while (strm->next_out > state->x.next) {
108 0 : put = strm->next_out - state->x.next > (int)max ? max :
109 0 : (unsigned)(strm->next_out - state->x.next);
110 0 : writ = write(state->fd, state->x.next, put);
111 0 : if (writ < 0) {
112 0 : gz_error(state, Z_ERRNO, zstrerror());
113 0 : return -1;
114 : }
115 0 : state->x.next += writ;
116 : }
117 0 : if (strm->avail_out == 0) {
118 0 : strm->avail_out = state->size;
119 0 : strm->next_out = state->out;
120 0 : state->x.next = state->out;
121 : }
122 : }
123 :
124 : /* compress */
125 0 : have = strm->avail_out;
126 0 : ret = deflate(strm, flush);
127 0 : if (ret == Z_STREAM_ERROR) {
128 0 : gz_error(state, Z_STREAM_ERROR,
129 : "internal error: deflate stream corrupt");
130 0 : return -1;
131 : }
132 0 : have -= strm->avail_out;
133 0 : } while (have);
134 :
135 : /* if that completed a deflate stream, allow another to start */
136 0 : if (flush == Z_FINISH)
137 0 : deflateReset(strm);
138 :
139 : /* all done, no errors */
140 0 : return 0;
141 : }
142 :
143 : /* Compress len zeros to output. Return -1 on a write error or memory
144 : allocation failure by gz_comp(), or 0 on success. */
145 0 : local int gz_zero(state, len)
146 : gz_statep state;
147 : z_off64_t len;
148 : {
149 : int first;
150 : unsigned n;
151 0 : z_streamp strm = &(state->strm);
152 :
153 : /* consume whatever's left in the input buffer */
154 0 : if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
155 0 : return -1;
156 :
157 : /* compress len zeros (len guaranteed > 0) */
158 0 : first = 1;
159 0 : while (len) {
160 0 : n = GT_OFF(state->size) || (z_off64_t)state->size > len ?
161 0 : (unsigned)len : state->size;
162 0 : if (first) {
163 0 : memset(state->in, 0, n);
164 0 : first = 0;
165 : }
166 0 : strm->avail_in = n;
167 0 : strm->next_in = state->in;
168 0 : state->x.pos += n;
169 0 : if (gz_comp(state, Z_NO_FLUSH) == -1)
170 0 : return -1;
171 0 : len -= n;
172 : }
173 0 : return 0;
174 : }
175 :
176 : /* Write len bytes from buf to file. Return the number of bytes written. If
177 : the returned value is less than len, then there was an error. */
178 0 : local z_size_t gz_write(state, buf, len)
179 : gz_statep state;
180 : voidpc buf;
181 : z_size_t len;
182 : {
183 0 : z_size_t put = len;
184 :
185 : /* if len is zero, avoid unnecessary operations */
186 0 : if (len == 0)
187 0 : return 0;
188 :
189 : /* allocate memory if this is the first time through */
190 0 : if (state->size == 0 && gz_init(state) == -1)
191 0 : return 0;
192 :
193 : /* check for seek request */
194 0 : if (state->seek) {
195 0 : state->seek = 0;
196 0 : if (gz_zero(state, state->skip) == -1)
197 0 : return 0;
198 : }
199 :
200 : /* for small len, copy to input buffer, otherwise compress directly */
201 0 : if (len < state->size) {
202 : /* copy to input buffer, compress when full */
203 : do {
204 : unsigned have, copy;
205 :
206 0 : if (state->strm.avail_in == 0)
207 0 : state->strm.next_in = state->in;
208 0 : have = (unsigned)((state->strm.next_in + state->strm.avail_in) -
209 0 : state->in);
210 0 : copy = state->size - have;
211 0 : if (copy > len)
212 0 : copy = len;
213 0 : memcpy(state->in + have, buf, copy);
214 0 : state->strm.avail_in += copy;
215 0 : state->x.pos += copy;
216 0 : buf = (const char *)buf + copy;
217 0 : len -= copy;
218 0 : if (len && gz_comp(state, Z_NO_FLUSH) == -1)
219 0 : return 0;
220 0 : } while (len);
221 : }
222 : else {
223 : /* consume whatever's left in the input buffer */
224 0 : if (state->strm.avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
225 0 : return 0;
226 :
227 : /* directly compress user buffer to file */
228 0 : state->strm.next_in = (z_const Bytef *)buf;
229 : do {
230 0 : unsigned n = (unsigned)-1;
231 0 : if (n > len)
232 0 : n = len;
233 0 : state->strm.avail_in = n;
234 0 : state->x.pos += n;
235 0 : if (gz_comp(state, Z_NO_FLUSH) == -1)
236 0 : return 0;
237 0 : len -= n;
238 0 : } while (len);
239 : }
240 :
241 : /* input was all buffered or compressed */
242 0 : return put;
243 : }
244 :
245 : /* -- see zlib.h -- */
246 0 : int ZEXPORT gzwrite(file, buf, len)
247 : gzFile file;
248 : voidpc buf;
249 : unsigned len;
250 : {
251 : gz_statep state;
252 :
253 : /* get internal structure */
254 0 : if (file == NULL)
255 0 : return 0;
256 0 : state = (gz_statep)file;
257 :
258 : /* check that we're writing and that there's no error */
259 0 : if (state->mode != GZ_WRITE || state->err != Z_OK)
260 0 : return 0;
261 :
262 : /* since an int is returned, make sure len fits in one, otherwise return
263 : with an error (this avoids a flaw in the interface) */
264 0 : if ((int)len < 0) {
265 0 : gz_error(state, Z_DATA_ERROR, "requested length does not fit in int");
266 0 : return 0;
267 : }
268 :
269 : /* write len bytes from buf (the return value will fit in an int) */
270 0 : return (int)gz_write(state, buf, len);
271 : }
272 :
273 : /* -- see zlib.h -- */
274 0 : z_size_t ZEXPORT gzfwrite(buf, size, nitems, file)
275 : voidpc buf;
276 : z_size_t size;
277 : z_size_t nitems;
278 : gzFile file;
279 : {
280 : z_size_t len;
281 : gz_statep state;
282 :
283 : /* get internal structure */
284 0 : if (file == NULL)
285 0 : return 0;
286 0 : state = (gz_statep)file;
287 :
288 : /* check that we're writing and that there's no error */
289 0 : if (state->mode != GZ_WRITE || state->err != Z_OK)
290 0 : return 0;
291 :
292 : /* compute bytes to read -- error on overflow */
293 0 : len = nitems * size;
294 0 : if (size && len / size != nitems) {
295 0 : gz_error(state, Z_STREAM_ERROR, "request does not fit in a size_t");
296 0 : return 0;
297 : }
298 :
299 : /* write len bytes to buf, return the number of full items written */
300 0 : return len ? gz_write(state, buf, len) / size : 0;
301 : }
302 :
303 : /* -- see zlib.h -- */
304 0 : int ZEXPORT gzputc(file, c)
305 : gzFile file;
306 : int c;
307 : {
308 : unsigned have;
309 : unsigned char buf[1];
310 : gz_statep state;
311 : z_streamp strm;
312 :
313 : /* get internal structure */
314 0 : if (file == NULL)
315 0 : return -1;
316 0 : state = (gz_statep)file;
317 0 : strm = &(state->strm);
318 :
319 : /* check that we're writing and that there's no error */
320 0 : if (state->mode != GZ_WRITE || state->err != Z_OK)
321 0 : return -1;
322 :
323 : /* check for seek request */
324 0 : if (state->seek) {
325 0 : state->seek = 0;
326 0 : if (gz_zero(state, state->skip) == -1)
327 0 : return -1;
328 : }
329 :
330 : /* try writing to input buffer for speed (state->size == 0 if buffer not
331 : initialized) */
332 0 : if (state->size) {
333 0 : if (strm->avail_in == 0)
334 0 : strm->next_in = state->in;
335 0 : have = (unsigned)((strm->next_in + strm->avail_in) - state->in);
336 0 : if (have < state->size) {
337 0 : state->in[have] = (unsigned char)c;
338 0 : strm->avail_in++;
339 0 : state->x.pos++;
340 0 : return c & 0xff;
341 : }
342 : }
343 :
344 : /* no room in buffer or not initialized, use gz_write() */
345 0 : buf[0] = (unsigned char)c;
346 0 : if (gz_write(state, buf, 1) != 1)
347 0 : return -1;
348 0 : return c & 0xff;
349 : }
350 :
351 : /* -- see zlib.h -- */
352 0 : int ZEXPORT gzputs(file, str)
353 : gzFile file;
354 : const char *str;
355 : {
356 : int ret;
357 : z_size_t len;
358 : gz_statep state;
359 :
360 : /* get internal structure */
361 0 : if (file == NULL)
362 0 : return -1;
363 0 : state = (gz_statep)file;
364 :
365 : /* check that we're writing and that there's no error */
366 0 : if (state->mode != GZ_WRITE || state->err != Z_OK)
367 0 : return -1;
368 :
369 : /* write string */
370 0 : len = strlen(str);
371 0 : ret = gz_write(state, str, len);
372 0 : return ret == 0 && len != 0 ? -1 : ret;
373 : }
374 :
375 : #if defined(STDC) || defined(Z_HAVE_STDARG_H)
376 : #include <stdarg.h>
377 :
378 : /* -- see zlib.h -- */
379 0 : int ZEXPORTVA gzvprintf(gzFile file, const char *format, va_list va)
380 : {
381 : int len;
382 : unsigned left;
383 : char *next;
384 : gz_statep state;
385 : z_streamp strm;
386 :
387 : /* get internal structure */
388 0 : if (file == NULL)
389 0 : return Z_STREAM_ERROR;
390 0 : state = (gz_statep)file;
391 0 : strm = &(state->strm);
392 :
393 : /* check that we're writing and that there's no error */
394 0 : if (state->mode != GZ_WRITE || state->err != Z_OK)
395 0 : return Z_STREAM_ERROR;
396 :
397 : /* make sure we have some buffer space */
398 0 : if (state->size == 0 && gz_init(state) == -1)
399 0 : return state->err;
400 :
401 : /* check for seek request */
402 0 : if (state->seek) {
403 0 : state->seek = 0;
404 0 : if (gz_zero(state, state->skip) == -1)
405 0 : return state->err;
406 : }
407 :
408 : /* do the printf() into the input buffer, put length in len -- the input
409 : buffer is double-sized just for this function, so there is guaranteed to
410 : be state->size bytes available after the current contents */
411 0 : if (strm->avail_in == 0)
412 0 : strm->next_in = state->in;
413 0 : next = (char *)(state->in + (strm->next_in - state->in) + strm->avail_in);
414 0 : next[state->size - 1] = 0;
415 : #ifdef NO_vsnprintf
416 : # ifdef HAS_vsprintf_void
417 : (void)vsprintf(next, format, va);
418 : for (len = 0; len < state->size; len++)
419 : if (next[len] == 0) break;
420 : # else
421 : len = vsprintf(next, format, va);
422 : # endif
423 : #else
424 : # ifdef HAS_vsnprintf_void
425 : (void)vsnprintf(next, state->size, format, va);
426 : len = strlen(next);
427 : # else
428 0 : len = vsnprintf(next, state->size, format, va);
429 : # endif
430 : #endif
431 :
432 : /* check that printf() results fit in buffer */
433 0 : if (len == 0 || (unsigned)len >= state->size || next[state->size - 1] != 0)
434 0 : return 0;
435 :
436 : /* update buffer and position, compress first half if past that */
437 0 : strm->avail_in += (unsigned)len;
438 0 : state->x.pos += len;
439 0 : if (strm->avail_in >= state->size) {
440 0 : left = strm->avail_in - state->size;
441 0 : strm->avail_in = state->size;
442 0 : if (gz_comp(state, Z_NO_FLUSH) == -1)
443 0 : return state->err;
444 0 : memcpy(state->in, state->in + state->size, left);
445 0 : strm->next_in = state->in;
446 0 : strm->avail_in = left;
447 : }
448 0 : return len;
449 : }
450 :
451 0 : int ZEXPORTVA gzprintf(gzFile file, const char *format, ...)
452 : {
453 : va_list va;
454 : int ret;
455 :
456 0 : va_start(va, format);
457 0 : ret = gzvprintf(file, format, va);
458 0 : va_end(va);
459 0 : return ret;
460 : }
461 :
462 : #else /* !STDC && !Z_HAVE_STDARG_H */
463 :
464 : /* -- see zlib.h -- */
465 : int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
466 : a11, a12, a13, a14, a15, a16, a17, a18, a19, a20)
467 : gzFile file;
468 : const char *format;
469 : int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
470 : a11, a12, a13, a14, a15, a16, a17, a18, a19, a20;
471 : {
472 : unsigned len, left;
473 : char *next;
474 : gz_statep state;
475 : z_streamp strm;
476 :
477 : /* get internal structure */
478 : if (file == NULL)
479 : return Z_STREAM_ERROR;
480 : state = (gz_statep)file;
481 : strm = &(state->strm);
482 :
483 : /* check that can really pass pointer in ints */
484 : if (sizeof(int) != sizeof(void *))
485 : return Z_STREAM_ERROR;
486 :
487 : /* check that we're writing and that there's no error */
488 : if (state->mode != GZ_WRITE || state->err != Z_OK)
489 : return Z_STREAM_ERROR;
490 :
491 : /* make sure we have some buffer space */
492 : if (state->size == 0 && gz_init(state) == -1)
493 : return state->error;
494 :
495 : /* check for seek request */
496 : if (state->seek) {
497 : state->seek = 0;
498 : if (gz_zero(state, state->skip) == -1)
499 : return state->error;
500 : }
501 :
502 : /* do the printf() into the input buffer, put length in len -- the input
503 : buffer is double-sized just for this function, so there is guaranteed to
504 : be state->size bytes available after the current contents */
505 : if (strm->avail_in == 0)
506 : strm->next_in = state->in;
507 : next = (char *)(strm->next_in + strm->avail_in);
508 : next[state->size - 1] = 0;
509 : #ifdef NO_snprintf
510 : # ifdef HAS_sprintf_void
511 : sprintf(next, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12,
512 : a13, a14, a15, a16, a17, a18, a19, a20);
513 : for (len = 0; len < size; len++)
514 : if (next[len] == 0)
515 : break;
516 : # else
517 : len = sprintf(next, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11,
518 : a12, a13, a14, a15, a16, a17, a18, a19, a20);
519 : # endif
520 : #else
521 : # ifdef HAS_snprintf_void
522 : snprintf(next, state->size, format, a1, a2, a3, a4, a5, a6, a7, a8, a9,
523 : a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
524 : len = strlen(next);
525 : # else
526 : len = snprintf(next, state->size, format, a1, a2, a3, a4, a5, a6, a7, a8,
527 : a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
528 : # endif
529 : #endif
530 :
531 : /* check that printf() results fit in buffer */
532 : if (len == 0 || len >= state->size || next[state->size - 1] != 0)
533 : return 0;
534 :
535 : /* update buffer and position, compress first half if past that */
536 : strm->avail_in += len;
537 : state->x.pos += len;
538 : if (strm->avail_in >= state->size) {
539 : left = strm->avail_in - state->size;
540 : strm->avail_in = state->size;
541 : if (gz_comp(state, Z_NO_FLUSH) == -1)
542 : return state->err;
543 : memcpy(state->in, state->in + state->size, left);
544 : strm->next_in = state->in;
545 : strm->avail_in = left;
546 : }
547 : return (int)len;
548 : }
549 :
550 : #endif
551 :
552 : /* -- see zlib.h -- */
553 0 : int ZEXPORT gzflush(file, flush)
554 : gzFile file;
555 : int flush;
556 : {
557 : gz_statep state;
558 :
559 : /* get internal structure */
560 0 : if (file == NULL)
561 0 : return Z_STREAM_ERROR;
562 0 : state = (gz_statep)file;
563 :
564 : /* check that we're writing and that there's no error */
565 0 : if (state->mode != GZ_WRITE || state->err != Z_OK)
566 0 : return Z_STREAM_ERROR;
567 :
568 : /* check flush parameter */
569 0 : if (flush < 0 || flush > Z_FINISH)
570 0 : return Z_STREAM_ERROR;
571 :
572 : /* check for seek request */
573 0 : if (state->seek) {
574 0 : state->seek = 0;
575 0 : if (gz_zero(state, state->skip) == -1)
576 0 : return state->err;
577 : }
578 :
579 : /* compress remaining data with requested flush */
580 0 : (void)gz_comp(state, flush);
581 0 : return state->err;
582 : }
583 :
584 : /* -- see zlib.h -- */
585 0 : int ZEXPORT gzsetparams(file, level, strategy)
586 : gzFile file;
587 : int level;
588 : int strategy;
589 : {
590 : gz_statep state;
591 : z_streamp strm;
592 :
593 : /* get internal structure */
594 0 : if (file == NULL)
595 0 : return Z_STREAM_ERROR;
596 0 : state = (gz_statep)file;
597 0 : strm = &(state->strm);
598 :
599 : /* check that we're writing and that there's no error */
600 0 : if (state->mode != GZ_WRITE || state->err != Z_OK)
601 0 : return Z_STREAM_ERROR;
602 :
603 : /* if no change is requested, then do nothing */
604 0 : if (level == state->level && strategy == state->strategy)
605 0 : return Z_OK;
606 :
607 : /* check for seek request */
608 0 : if (state->seek) {
609 0 : state->seek = 0;
610 0 : if (gz_zero(state, state->skip) == -1)
611 0 : return state->err;
612 : }
613 :
614 : /* change compression parameters for subsequent input */
615 0 : if (state->size) {
616 : /* flush previous input with previous parameters before changing */
617 0 : if (strm->avail_in && gz_comp(state, Z_BLOCK) == -1)
618 0 : return state->err;
619 0 : deflateParams(strm, level, strategy);
620 : }
621 0 : state->level = level;
622 0 : state->strategy = strategy;
623 0 : return Z_OK;
624 : }
625 :
626 : /* -- see zlib.h -- */
627 0 : int ZEXPORT gzclose_w(file)
628 : gzFile file;
629 : {
630 0 : int ret = Z_OK;
631 : gz_statep state;
632 :
633 : /* get internal structure */
634 0 : if (file == NULL)
635 0 : return Z_STREAM_ERROR;
636 0 : state = (gz_statep)file;
637 :
638 : /* check that we're writing */
639 0 : if (state->mode != GZ_WRITE)
640 0 : return Z_STREAM_ERROR;
641 :
642 : /* check for seek request */
643 0 : if (state->seek) {
644 0 : state->seek = 0;
645 0 : if (gz_zero(state, state->skip) == -1)
646 0 : ret = state->err;
647 : }
648 :
649 : /* flush, free memory, and close file */
650 0 : if (gz_comp(state, Z_FINISH) == -1)
651 0 : ret = state->err;
652 0 : if (state->size) {
653 0 : if (!state->direct) {
654 0 : (void)deflateEnd(&(state->strm));
655 0 : free(state->out);
656 : }
657 0 : free(state->in);
658 : }
659 0 : gz_error(state, Z_OK, NULL);
660 0 : free(state->path);
661 0 : if (close(state->fd) == -1)
662 0 : ret = Z_ERRNO;
663 0 : free(state);
664 0 : return ret;
665 : }
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