VirtualBox

source: vbox/trunk/src/libs/zlib-1.2.13/gzwrite.c

Last change on this file was 97832, checked in by vboxsync, 17 months ago

zlib-1.2.13: adding svn:sync-process property to all zlib files (except LICESNSE and zlib.3.pdf). bugref:10335
  • Property svn:eol-style set to native
File size: 22.8 KB
Line 
1/* gzwrite.c -- zlib functions for writing gzip files
2 * Copyright (C) 2004-2019 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 */
9local int gz_init OF((gz_statep));
10local int gz_comp OF((gz_statep, int));
11local int gz_zero OF((gz_statep, z_off64_t));
12local 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. */
17local int gz_init(state)
18 gz_statep state;
19{
20 int ret;
21 z_streamp strm = &(state->strm);
22
23 /* allocate input buffer (double size for gzprintf) */
24 state->in = (unsigned char *)malloc(state->want << 1);
25 if (state->in == NULL) {
26 gz_error(state, Z_MEM_ERROR, "out of memory");
27 return -1;
28 }
29
30 /* only need output buffer and deflate state if compressing */
31 if (!state->direct) {
32 /* allocate output buffer */
33 state->out = (unsigned char *)malloc(state->want);
34 if (state->out == NULL) {
35 free(state->in);
36 gz_error(state, Z_MEM_ERROR, "out of memory");
37 return -1;
38 }
39
40 /* allocate deflate memory, set up for gzip compression */
41 strm->zalloc = Z_NULL;
42 strm->zfree = Z_NULL;
43 strm->opaque = Z_NULL;
44 ret = deflateInit2(strm, state->level, Z_DEFLATED,
45 MAX_WBITS + 16, DEF_MEM_LEVEL, state->strategy);
46 if (ret != Z_OK) {
47 free(state->out);
48 free(state->in);
49 gz_error(state, Z_MEM_ERROR, "out of memory");
50 return -1;
51 }
52 strm->next_in = NULL;
53 }
54
55 /* mark state as initialized */
56 state->size = state->want;
57
58 /* initialize write buffer if compressing */
59 if (!state->direct) {
60 strm->avail_out = state->size;
61 strm->next_out = state->out;
62 state->x.next = strm->next_out;
63 }
64 return 0;
65}
66
67#ifdef IPRT_NO_CRT /* VBox */
68DECLINLINE(int) gz_write_wrap(gz_statep state, void const *pvSrc, size_t cbToWrite) /* VBox */
69{ /* VBox */
70 size_t cbWritten; /* VBox */
71 int ret = RTFileWrite(state->fd, pvSrc, cbToWrite, &cbWritten); /* VBox */
72 if (RT_SUCCESS(ret)) /* VBox */
73 ret = (int)cbWritten; /* VBox */
74 else { /* VBox */
75 char szDefine[80]; /* VBox */
76 RTErrQueryDefine(ret, szDefine, sizeof(szDefine), false); /* VBox */
77 gz_error(state, Z_ERRNO, szDefine); /* VBox */
78 ret = -1; /* VBox */
79 } /* VBox */
80 return ret; /* VBox */
81} /* VBox */
82#endif /* IPRT_NO_CRT */ /* VBox */
83
84/* Compress whatever is at avail_in and next_in and write to the output file.
85 Return -1 if there is an error writing to the output file or if gz_init()
86 fails to allocate memory, otherwise 0. flush is assumed to be a valid
87 deflate() flush value. If flush is Z_FINISH, then the deflate() state is
88 reset to start a new gzip stream. If gz->direct is true, then simply write
89 to the output file without compressing, and ignore flush. */
90local int gz_comp(state, flush)
91 gz_statep state;
92 int flush;
93{
94 int ret, writ;
95 unsigned have, put, max = ((unsigned)-1 >> 2) + 1;
96 z_streamp strm = &(state->strm);
97
98 /* allocate memory if this is the first time through */
99 if (state->size == 0 && gz_init(state) == -1)
100 return -1;
101
102 /* write directly if requested */
103 if (state->direct) {
104 while (strm->avail_in) {
105 put = strm->avail_in > max ? max : strm->avail_in;
106#ifndef IPRT_NO_CRT /* VBox */
107 writ = write(state->fd, strm->next_in, put);
108 if (writ < 0) {
109 gz_error(state, Z_ERRNO, zstrerror());
110 return -1;
111 }
112#else /* VBox */
113 writ = gz_write_wrap(state, strm->next_in, put); /* VBox */
114 if (writ < 0) /* VBox */
115 return -1; /* VBox */
116#endif /* VBox */
117 strm->avail_in -= (unsigned)writ;
118 strm->next_in += writ;
119 }
120 return 0;
121 }
122
123 /* check for a pending reset */
124 if (state->reset) {
125 /* don't start a new gzip member unless there is data to write */
126 if (strm->avail_in == 0)
127 return 0;
128 deflateReset(strm);
129 state->reset = 0;
130 }
131
132 /* run deflate() on provided input until it produces no more output */
133 ret = Z_OK;
134 do {
135 /* write out current buffer contents if full, or if flushing, but if
136 doing Z_FINISH then don't write until we get to Z_STREAM_END */
137 if (strm->avail_out == 0 || (flush != Z_NO_FLUSH &&
138 (flush != Z_FINISH || ret == Z_STREAM_END))) {
139 while (strm->next_out > state->x.next) {
140 put = strm->next_out - state->x.next > (int)max ? max :
141 (unsigned)(strm->next_out - state->x.next);
142#ifndef IPRT_NO_CRT /* VBox */
143 writ = write(state->fd, state->x.next, put);
144 if (writ < 0) {
145 gz_error(state, Z_ERRNO, zstrerror());
146 return -1;
147 }
148#else /* VBox */
149 writ = gz_write_wrap(state, state->x.next, put); /* VBox */
150 if (writ < 0) /* VBox */
151 return -1; /* VBox */
152#endif /* VBox */
153 state->x.next += writ;
154 }
155 if (strm->avail_out == 0) {
156 strm->avail_out = state->size;
157 strm->next_out = state->out;
158 state->x.next = state->out;
159 }
160 }
161
162 /* compress */
163 have = strm->avail_out;
164 ret = deflate(strm, flush);
165 if (ret == Z_STREAM_ERROR) {
166 gz_error(state, Z_STREAM_ERROR,
167 "internal error: deflate stream corrupt");
168 return -1;
169 }
170 have -= strm->avail_out;
171 } while (have);
172
173 /* if that completed a deflate stream, allow another to start */
174 if (flush == Z_FINISH)
175 state->reset = 1;
176
177 /* all done, no errors */
178 return 0;
179}
180
181/* Compress len zeros to output. Return -1 on a write error or memory
182 allocation failure by gz_comp(), or 0 on success. */
183local int gz_zero(state, len)
184 gz_statep state;
185 z_off64_t len;
186{
187 int first;
188 unsigned n;
189 z_streamp strm = &(state->strm);
190
191 /* consume whatever's left in the input buffer */
192 if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
193 return -1;
194
195 /* compress len zeros (len guaranteed > 0) */
196 first = 1;
197 while (len) {
198 n = GT_OFF(state->size) || (z_off64_t)state->size > len ?
199 (unsigned)len : state->size;
200 if (first) {
201 memset(state->in, 0, n);
202 first = 0;
203 }
204 strm->avail_in = n;
205 strm->next_in = state->in;
206 state->x.pos += n;
207 if (gz_comp(state, Z_NO_FLUSH) == -1)
208 return -1;
209 len -= n;
210 }
211 return 0;
212}
213
214/* Write len bytes from buf to file. Return the number of bytes written. If
215 the returned value is less than len, then there was an error. */
216local z_size_t gz_write(state, buf, len)
217 gz_statep state;
218 voidpc buf;
219 z_size_t len;
220{
221 z_size_t put = len;
222
223 /* if len is zero, avoid unnecessary operations */
224 if (len == 0)
225 return 0;
226
227 /* allocate memory if this is the first time through */
228 if (state->size == 0 && gz_init(state) == -1)
229 return 0;
230
231 /* check for seek request */
232 if (state->seek) {
233 state->seek = 0;
234 if (gz_zero(state, state->skip) == -1)
235 return 0;
236 }
237
238 /* for small len, copy to input buffer, otherwise compress directly */
239 if (len < state->size) {
240 /* copy to input buffer, compress when full */
241 do {
242 unsigned have, copy;
243
244 if (state->strm.avail_in == 0)
245 state->strm.next_in = state->in;
246 have = (unsigned)((state->strm.next_in + state->strm.avail_in) -
247 state->in);
248 copy = state->size - have;
249 if (copy > len)
250 copy = (unsigned)len;
251 memcpy(state->in + have, buf, copy);
252 state->strm.avail_in += copy;
253 state->x.pos += copy;
254 buf = (const char *)buf + copy;
255 len -= copy;
256 if (len && gz_comp(state, Z_NO_FLUSH) == -1)
257 return 0;
258 } while (len);
259 }
260 else {
261 /* consume whatever's left in the input buffer */
262 if (state->strm.avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
263 return 0;
264
265 /* directly compress user buffer to file */
266 state->strm.next_in = (z_const Bytef *)buf;
267 do {
268 unsigned n = (unsigned)-1;
269 if (n > len)
270 n = (unsigned)len;
271 state->strm.avail_in = n;
272 state->x.pos += n;
273 if (gz_comp(state, Z_NO_FLUSH) == -1)
274 return 0;
275 len -= n;
276 } while (len);
277 }
278
279 /* input was all buffered or compressed */
280 return put;
281}
282
283/* -- see zlib.h -- */
284int ZEXPORT gzwrite(file, buf, len)
285 gzFile file;
286 voidpc buf;
287 unsigned len;
288{
289 gz_statep state;
290
291 /* get internal structure */
292 if (file == NULL)
293 return 0;
294 state = (gz_statep)file;
295
296 /* check that we're writing and that there's no error */
297 if (state->mode != GZ_WRITE || state->err != Z_OK)
298 return 0;
299
300 /* since an int is returned, make sure len fits in one, otherwise return
301 with an error (this avoids a flaw in the interface) */
302 if ((int)len < 0) {
303 gz_error(state, Z_DATA_ERROR, "requested length does not fit in int");
304 return 0;
305 }
306
307 /* write len bytes from buf (the return value will fit in an int) */
308 return (int)gz_write(state, buf, len);
309}
310
311/* -- see zlib.h -- */
312z_size_t ZEXPORT gzfwrite(buf, size, nitems, file)
313 voidpc buf;
314 z_size_t size;
315 z_size_t nitems;
316 gzFile file;
317{
318 z_size_t len;
319 gz_statep state;
320
321 /* get internal structure */
322 if (file == NULL)
323 return 0;
324 state = (gz_statep)file;
325
326 /* check that we're writing and that there's no error */
327 if (state->mode != GZ_WRITE || state->err != Z_OK)
328 return 0;
329
330 /* compute bytes to read -- error on overflow */
331 len = nitems * size;
332 if (size && len / size != nitems) {
333 gz_error(state, Z_STREAM_ERROR, "request does not fit in a size_t");
334 return 0;
335 }
336
337 /* write len bytes to buf, return the number of full items written */
338 return len ? gz_write(state, buf, len) / size : 0;
339}
340
341/* -- see zlib.h -- */
342int ZEXPORT gzputc(file, c)
343 gzFile file;
344 int c;
345{
346 unsigned have;
347 unsigned char buf[1];
348 gz_statep state;
349 z_streamp strm;
350
351 /* get internal structure */
352 if (file == NULL)
353 return -1;
354 state = (gz_statep)file;
355 strm = &(state->strm);
356
357 /* check that we're writing and that there's no error */
358 if (state->mode != GZ_WRITE || state->err != Z_OK)
359 return -1;
360
361 /* check for seek request */
362 if (state->seek) {
363 state->seek = 0;
364 if (gz_zero(state, state->skip) == -1)
365 return -1;
366 }
367
368 /* try writing to input buffer for speed (state->size == 0 if buffer not
369 initialized) */
370 if (state->size) {
371 if (strm->avail_in == 0)
372 strm->next_in = state->in;
373 have = (unsigned)((strm->next_in + strm->avail_in) - state->in);
374 if (have < state->size) {
375 state->in[have] = (unsigned char)c;
376 strm->avail_in++;
377 state->x.pos++;
378 return c & 0xff;
379 }
380 }
381
382 /* no room in buffer or not initialized, use gz_write() */
383 buf[0] = (unsigned char)c;
384 if (gz_write(state, buf, 1) != 1)
385 return -1;
386 return c & 0xff;
387}
388
389/* -- see zlib.h -- */
390int ZEXPORT gzputs(file, s)
391 gzFile file;
392 const char *s;
393{
394 z_size_t len, put;
395 gz_statep state;
396
397 /* get internal structure */
398 if (file == NULL)
399 return -1;
400 state = (gz_statep)file;
401
402 /* check that we're writing and that there's no error */
403 if (state->mode != GZ_WRITE || state->err != Z_OK)
404 return -1;
405
406 /* write string */
407 len = strlen(s);
408 if ((int)len < 0 || (unsigned)len != len) {
409 gz_error(state, Z_STREAM_ERROR, "string length does not fit in int");
410 return -1;
411 }
412 put = gz_write(state, s, len);
413 return put < len ? -1 : (int)len;
414}
415
416#if defined(STDC) || defined(Z_HAVE_STDARG_H)
417#include <stdarg.h>
418
419/* -- see zlib.h -- */
420int ZEXPORTVA gzvprintf(gzFile file, const char *format, va_list va)
421{
422 int len;
423 unsigned left;
424 char *next;
425 gz_statep state;
426 z_streamp strm;
427
428 /* get internal structure */
429 if (file == NULL)
430 return Z_STREAM_ERROR;
431 state = (gz_statep)file;
432 strm = &(state->strm);
433
434 /* check that we're writing and that there's no error */
435 if (state->mode != GZ_WRITE || state->err != Z_OK)
436 return Z_STREAM_ERROR;
437
438 /* make sure we have some buffer space */
439 if (state->size == 0 && gz_init(state) == -1)
440 return state->err;
441
442 /* check for seek request */
443 if (state->seek) {
444 state->seek = 0;
445 if (gz_zero(state, state->skip) == -1)
446 return state->err;
447 }
448
449 /* do the printf() into the input buffer, put length in len -- the input
450 buffer is double-sized just for this function, so there is guaranteed to
451 be state->size bytes available after the current contents */
452 if (strm->avail_in == 0)
453 strm->next_in = state->in;
454 next = (char *)(state->in + (strm->next_in - state->in) + strm->avail_in);
455 next[state->size - 1] = 0;
456#ifdef NO_vsnprintf
457# ifdef HAS_vsprintf_void
458 (void)vsprintf(next, format, va);
459 for (len = 0; len < state->size; len++)
460 if (next[len] == 0) break;
461# else
462 len = vsprintf(next, format, va);
463# endif
464#else
465# ifdef HAS_vsnprintf_void
466 (void)vsnprintf(next, state->size, format, va);
467 len = strlen(next);
468# else
469 len = vsnprintf(next, state->size, format, va);
470# endif
471#endif
472
473 /* check that printf() results fit in buffer */
474 if (len == 0 || (unsigned)len >= state->size || next[state->size - 1] != 0)
475 return 0;
476
477 /* update buffer and position, compress first half if past that */
478 strm->avail_in += (unsigned)len;
479 state->x.pos += len;
480 if (strm->avail_in >= state->size) {
481 left = strm->avail_in - state->size;
482 strm->avail_in = state->size;
483 if (gz_comp(state, Z_NO_FLUSH) == -1)
484 return state->err;
485 memmove(state->in, state->in + state->size, left);
486 strm->next_in = state->in;
487 strm->avail_in = left;
488 }
489 return len;
490}
491
492int ZEXPORTVA gzprintf(gzFile file, const char *format, ...)
493{
494 va_list va;
495 int ret;
496
497 va_start(va, format);
498 ret = gzvprintf(file, format, va);
499 va_end(va);
500 return ret;
501}
502
503#else /* !STDC && !Z_HAVE_STDARG_H */
504
505/* -- see zlib.h -- */
506int ZEXPORTVA gzprintf(file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
507 a11, a12, a13, a14, a15, a16, a17, a18, a19, a20)
508 gzFile file;
509 const char *format;
510 int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
511 a11, a12, a13, a14, a15, a16, a17, a18, a19, a20;
512{
513 unsigned len, left;
514 char *next;
515 gz_statep state;
516 z_streamp strm;
517
518 /* get internal structure */
519 if (file == NULL)
520 return Z_STREAM_ERROR;
521 state = (gz_statep)file;
522 strm = &(state->strm);
523
524 /* check that can really pass pointer in ints */
525 if (sizeof(int) != sizeof(void *))
526 return Z_STREAM_ERROR;
527
528 /* check that we're writing and that there's no error */
529 if (state->mode != GZ_WRITE || state->err != Z_OK)
530 return Z_STREAM_ERROR;
531
532 /* make sure we have some buffer space */
533 if (state->size == 0 && gz_init(state) == -1)
534 return state->error;
535
536 /* check for seek request */
537 if (state->seek) {
538 state->seek = 0;
539 if (gz_zero(state, state->skip) == -1)
540 return state->error;
541 }
542
543 /* do the printf() into the input buffer, put length in len -- the input
544 buffer is double-sized just for this function, so there is guaranteed to
545 be state->size bytes available after the current contents */
546 if (strm->avail_in == 0)
547 strm->next_in = state->in;
548 next = (char *)(strm->next_in + strm->avail_in);
549 next[state->size - 1] = 0;
550#ifdef NO_snprintf
551# ifdef HAS_sprintf_void
552 sprintf(next, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12,
553 a13, a14, a15, a16, a17, a18, a19, a20);
554 for (len = 0; len < size; len++)
555 if (next[len] == 0)
556 break;
557# else
558 len = sprintf(next, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11,
559 a12, a13, a14, a15, a16, a17, a18, a19, a20);
560# endif
561#else
562# ifdef HAS_snprintf_void
563 snprintf(next, state->size, format, a1, a2, a3, a4, a5, a6, a7, a8, a9,
564 a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
565 len = strlen(next);
566# else
567 len = snprintf(next, state->size, format, a1, a2, a3, a4, a5, a6, a7, a8,
568 a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
569# endif
570#endif
571
572 /* check that printf() results fit in buffer */
573 if (len == 0 || len >= state->size || next[state->size - 1] != 0)
574 return 0;
575
576 /* update buffer and position, compress first half if past that */
577 strm->avail_in += len;
578 state->x.pos += len;
579 if (strm->avail_in >= state->size) {
580 left = strm->avail_in - state->size;
581 strm->avail_in = state->size;
582 if (gz_comp(state, Z_NO_FLUSH) == -1)
583 return state->err;
584 memmove(state->in, state->in + state->size, left);
585 strm->next_in = state->in;
586 strm->avail_in = left;
587 }
588 return (int)len;
589}
590
591#endif
592
593/* -- see zlib.h -- */
594int ZEXPORT gzflush(file, flush)
595 gzFile file;
596 int flush;
597{
598 gz_statep state;
599
600 /* get internal structure */
601 if (file == NULL)
602 return Z_STREAM_ERROR;
603 state = (gz_statep)file;
604
605 /* check that we're writing and that there's no error */
606 if (state->mode != GZ_WRITE || state->err != Z_OK)
607 return Z_STREAM_ERROR;
608
609 /* check flush parameter */
610 if (flush < 0 || flush > Z_FINISH)
611 return Z_STREAM_ERROR;
612
613 /* check for seek request */
614 if (state->seek) {
615 state->seek = 0;
616 if (gz_zero(state, state->skip) == -1)
617 return state->err;
618 }
619
620 /* compress remaining data with requested flush */
621 (void)gz_comp(state, flush);
622 return state->err;
623}
624
625/* -- see zlib.h -- */
626int ZEXPORT gzsetparams(file, level, strategy)
627 gzFile file;
628 int level;
629 int strategy;
630{
631 gz_statep state;
632 z_streamp strm;
633
634 /* get internal structure */
635 if (file == NULL)
636 return Z_STREAM_ERROR;
637 state = (gz_statep)file;
638 strm = &(state->strm);
639
640 /* check that we're writing and that there's no error */
641 if (state->mode != GZ_WRITE || state->err != Z_OK)
642 return Z_STREAM_ERROR;
643
644 /* if no change is requested, then do nothing */
645 if (level == state->level && strategy == state->strategy)
646 return Z_OK;
647
648 /* check for seek request */
649 if (state->seek) {
650 state->seek = 0;
651 if (gz_zero(state, state->skip) == -1)
652 return state->err;
653 }
654
655 /* change compression parameters for subsequent input */
656 if (state->size) {
657 /* flush previous input with previous parameters before changing */
658 if (strm->avail_in && gz_comp(state, Z_BLOCK) == -1)
659 return state->err;
660 deflateParams(strm, level, strategy);
661 }
662 state->level = level;
663 state->strategy = strategy;
664 return Z_OK;
665}
666
667/* -- see zlib.h -- */
668int ZEXPORT gzclose_w(file)
669 gzFile file;
670{
671 int ret = Z_OK;
672 gz_statep state;
673
674 /* get internal structure */
675 if (file == NULL)
676 return Z_STREAM_ERROR;
677 state = (gz_statep)file;
678
679 /* check that we're writing */
680 if (state->mode != GZ_WRITE)
681 return Z_STREAM_ERROR;
682
683 /* check for seek request */
684 if (state->seek) {
685 state->seek = 0;
686 if (gz_zero(state, state->skip) == -1)
687 ret = state->err;
688 }
689
690 /* flush, free memory, and close file */
691 if (gz_comp(state, Z_FINISH) == -1)
692 ret = state->err;
693 if (state->size) {
694 if (!state->direct) {
695 (void)deflateEnd(&(state->strm));
696 free(state->out);
697 }
698 free(state->in);
699 }
700 gz_error(state, Z_OK, NULL);
701 free(state->path);
702#ifndef IPRT_NO_CRT /* VBox */
703 if (close(state->fd) == -1)
704#else /* VBox */
705 if (RT_FAILURE(RTFileClose(state->fd))) /* VBox */
706#endif /* VBox */
707 ret = Z_ERRNO;
708 free(state);
709 return ret;
710}
Note: See TracBrowser for help on using the repository browser.

© 2023 Oracle
Contact – Privacy policy – Terms of Use