Replace nonsense -1234 return value in dyn_buf_write by proper AVERROR(ENOMEM)
[libav.git] / libavformat / aviobuf.c
1 /*
2 * Buffered I/O for ffmpeg system
3 * Copyright (c) 2000,2001 Fabrice Bellard
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "libavutil/crc.h"
23 #include "avformat.h"
24 #include "avio.h"
25 #include <stdarg.h>
26
27 #define IO_BUFFER_SIZE 32768
28
29 static void fill_buffer(ByteIOContext *s);
30
31 int init_put_byte(ByteIOContext *s,
32 unsigned char *buffer,
33 int buffer_size,
34 int write_flag,
35 void *opaque,
36 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
37 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
38 int64_t (*seek)(void *opaque, int64_t offset, int whence))
39 {
40 s->buffer = buffer;
41 s->buffer_size = buffer_size;
42 s->buf_ptr = buffer;
43 s->opaque = opaque;
44 url_resetbuf(s, write_flag ? URL_WRONLY : URL_RDONLY);
45 s->write_packet = write_packet;
46 s->read_packet = read_packet;
47 s->seek = seek;
48 s->pos = 0;
49 s->must_flush = 0;
50 s->eof_reached = 0;
51 s->error = 0;
52 s->is_streamed = 0;
53 s->max_packet_size = 0;
54 s->update_checksum= NULL;
55 if(!read_packet && !write_flag){
56 s->pos = buffer_size;
57 s->buf_end = s->buffer + buffer_size;
58 }
59 s->read_pause = NULL;
60 s->read_seek = NULL;
61 return 0;
62 }
63
64 ByteIOContext *av_alloc_put_byte(
65 unsigned char *buffer,
66 int buffer_size,
67 int write_flag,
68 void *opaque,
69 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
70 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
71 int64_t (*seek)(void *opaque, int64_t offset, int whence))
72 {
73 ByteIOContext *s = av_mallocz(sizeof(ByteIOContext));
74 init_put_byte(s, buffer, buffer_size, write_flag, opaque,
75 read_packet, write_packet, seek);
76 return s;
77 }
78
79 static void flush_buffer(ByteIOContext *s)
80 {
81 if (s->buf_ptr > s->buffer) {
82 if (s->write_packet && !s->error){
83 int ret= s->write_packet(s->opaque, s->buffer, s->buf_ptr - s->buffer);
84 if(ret < 0){
85 s->error = ret;
86 }
87 }
88 if(s->update_checksum){
89 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
90 s->checksum_ptr= s->buffer;
91 }
92 s->pos += s->buf_ptr - s->buffer;
93 }
94 s->buf_ptr = s->buffer;
95 }
96
97 void put_byte(ByteIOContext *s, int b)
98 {
99 *(s->buf_ptr)++ = b;
100 if (s->buf_ptr >= s->buf_end)
101 flush_buffer(s);
102 }
103
104 void put_buffer(ByteIOContext *s, const unsigned char *buf, int size)
105 {
106 int len;
107
108 while (size > 0) {
109 len = (s->buf_end - s->buf_ptr);
110 if (len > size)
111 len = size;
112 memcpy(s->buf_ptr, buf, len);
113 s->buf_ptr += len;
114
115 if (s->buf_ptr >= s->buf_end)
116 flush_buffer(s);
117
118 buf += len;
119 size -= len;
120 }
121 }
122
123 void put_flush_packet(ByteIOContext *s)
124 {
125 flush_buffer(s);
126 s->must_flush = 0;
127 }
128
129 int64_t url_fseek(ByteIOContext *s, int64_t offset, int whence)
130 {
131 int64_t offset1;
132 int64_t pos;
133
134 if(!s)
135 return AVERROR(EINVAL);
136
137 pos = s->pos - (s->write_flag ? 0 : (s->buf_end - s->buffer));
138
139 if (whence != SEEK_CUR && whence != SEEK_SET)
140 return AVERROR(EINVAL);
141
142 if (whence == SEEK_CUR) {
143 offset1 = pos + (s->buf_ptr - s->buffer);
144 if (offset == 0)
145 return offset1;
146 offset += offset1;
147 }
148 offset1 = offset - pos;
149 if (!s->must_flush &&
150 offset1 >= 0 && offset1 < (s->buf_end - s->buffer)) {
151 /* can do the seek inside the buffer */
152 s->buf_ptr = s->buffer + offset1;
153 } else if(s->is_streamed && !s->write_flag &&
154 offset1 >= 0 && offset1 < (s->buf_end - s->buffer) + (1<<16)){
155 while(s->pos < offset && !s->eof_reached)
156 fill_buffer(s);
157 if (s->eof_reached)
158 return AVERROR(EPIPE);
159 s->buf_ptr = s->buf_end + offset - s->pos;
160 } else {
161 int64_t res = AVERROR(EPIPE);
162
163 #if CONFIG_MUXERS || CONFIG_NETWORK
164 if (s->write_flag) {
165 flush_buffer(s);
166 s->must_flush = 1;
167 }
168 #endif /* CONFIG_MUXERS || CONFIG_NETWORK */
169 if (!s->seek || (res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
170 return res;
171 if (!s->write_flag)
172 s->buf_end = s->buffer;
173 s->buf_ptr = s->buffer;
174 s->pos = offset;
175 }
176 s->eof_reached = 0;
177 return offset;
178 }
179
180 void url_fskip(ByteIOContext *s, int64_t offset)
181 {
182 url_fseek(s, offset, SEEK_CUR);
183 }
184
185 int64_t url_ftell(ByteIOContext *s)
186 {
187 return url_fseek(s, 0, SEEK_CUR);
188 }
189
190 int64_t url_fsize(ByteIOContext *s)
191 {
192 int64_t size;
193
194 if(!s)
195 return AVERROR(EINVAL);
196
197 if (!s->seek)
198 return AVERROR(EPIPE);
199 size = s->seek(s->opaque, 0, AVSEEK_SIZE);
200 if(size<0){
201 if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
202 return size;
203 size++;
204 s->seek(s->opaque, s->pos, SEEK_SET);
205 }
206 return size;
207 }
208
209 int url_feof(ByteIOContext *s)
210 {
211 if(!s)
212 return 0;
213 return s->eof_reached;
214 }
215
216 int url_ferror(ByteIOContext *s)
217 {
218 if(!s)
219 return 0;
220 return s->error;
221 }
222
223 void put_le32(ByteIOContext *s, unsigned int val)
224 {
225 put_byte(s, val);
226 put_byte(s, val >> 8);
227 put_byte(s, val >> 16);
228 put_byte(s, val >> 24);
229 }
230
231 void put_be32(ByteIOContext *s, unsigned int val)
232 {
233 put_byte(s, val >> 24);
234 put_byte(s, val >> 16);
235 put_byte(s, val >> 8);
236 put_byte(s, val);
237 }
238
239 void put_strz(ByteIOContext *s, const char *str)
240 {
241 if (str)
242 put_buffer(s, (const unsigned char *) str, strlen(str) + 1);
243 else
244 put_byte(s, 0);
245 }
246
247 void put_le64(ByteIOContext *s, uint64_t val)
248 {
249 put_le32(s, (uint32_t)(val & 0xffffffff));
250 put_le32(s, (uint32_t)(val >> 32));
251 }
252
253 void put_be64(ByteIOContext *s, uint64_t val)
254 {
255 put_be32(s, (uint32_t)(val >> 32));
256 put_be32(s, (uint32_t)(val & 0xffffffff));
257 }
258
259 void put_le16(ByteIOContext *s, unsigned int val)
260 {
261 put_byte(s, val);
262 put_byte(s, val >> 8);
263 }
264
265 void put_be16(ByteIOContext *s, unsigned int val)
266 {
267 put_byte(s, val >> 8);
268 put_byte(s, val);
269 }
270
271 void put_le24(ByteIOContext *s, unsigned int val)
272 {
273 put_le16(s, val & 0xffff);
274 put_byte(s, val >> 16);
275 }
276
277 void put_be24(ByteIOContext *s, unsigned int val)
278 {
279 put_be16(s, val >> 8);
280 put_byte(s, val);
281 }
282
283 void put_tag(ByteIOContext *s, const char *tag)
284 {
285 while (*tag) {
286 put_byte(s, *tag++);
287 }
288 }
289
290 /* Input stream */
291
292 static void fill_buffer(ByteIOContext *s)
293 {
294 uint8_t *dst= !s->max_packet_size && s->buf_end - s->buffer < s->buffer_size ? s->buf_ptr : s->buffer;
295 int len= s->buffer_size - (dst - s->buffer);
296
297 assert(s->buf_ptr == s->buf_end);
298
299 /* no need to do anything if EOF already reached */
300 if (s->eof_reached)
301 return;
302
303 if(s->update_checksum && dst == s->buffer){
304 if(s->buf_end > s->checksum_ptr)
305 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr);
306 s->checksum_ptr= s->buffer;
307 }
308
309 if(s->read_packet)
310 len = s->read_packet(s->opaque, dst, len);
311 else
312 len = 0;
313 if (len <= 0) {
314 /* do not modify buffer if EOF reached so that a seek back can
315 be done without rereading data */
316 s->eof_reached = 1;
317 if(len<0)
318 s->error= len;
319 } else {
320 s->pos += len;
321 s->buf_ptr = dst;
322 s->buf_end = dst + len;
323 }
324 }
325
326 unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
327 unsigned int len)
328 {
329 return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
330 }
331
332 unsigned long get_checksum(ByteIOContext *s)
333 {
334 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
335 s->update_checksum= NULL;
336 return s->checksum;
337 }
338
339 void init_checksum(ByteIOContext *s,
340 unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
341 unsigned long checksum)
342 {
343 s->update_checksum= update_checksum;
344 if(s->update_checksum){
345 s->checksum= checksum;
346 s->checksum_ptr= s->buf_ptr;
347 }
348 }
349
350 /* XXX: put an inline version */
351 int get_byte(ByteIOContext *s)
352 {
353 if (s->buf_ptr < s->buf_end) {
354 return *s->buf_ptr++;
355 } else {
356 fill_buffer(s);
357 if (s->buf_ptr < s->buf_end)
358 return *s->buf_ptr++;
359 else
360 return 0;
361 }
362 }
363
364 int url_fgetc(ByteIOContext *s)
365 {
366 if (s->buf_ptr < s->buf_end) {
367 return *s->buf_ptr++;
368 } else {
369 fill_buffer(s);
370 if (s->buf_ptr < s->buf_end)
371 return *s->buf_ptr++;
372 else
373 return URL_EOF;
374 }
375 }
376
377 int get_buffer(ByteIOContext *s, unsigned char *buf, int size)
378 {
379 int len, size1;
380
381 size1 = size;
382 while (size > 0) {
383 len = s->buf_end - s->buf_ptr;
384 if (len > size)
385 len = size;
386 if (len == 0) {
387 if(size > s->buffer_size && !s->update_checksum){
388 if(s->read_packet)
389 len = s->read_packet(s->opaque, buf, size);
390 if (len <= 0) {
391 /* do not modify buffer if EOF reached so that a seek back can
392 be done without rereading data */
393 s->eof_reached = 1;
394 if(len<0)
395 s->error= len;
396 break;
397 } else {
398 s->pos += len;
399 size -= len;
400 buf += len;
401 s->buf_ptr = s->buffer;
402 s->buf_end = s->buffer/* + len*/;
403 }
404 }else{
405 fill_buffer(s);
406 len = s->buf_end - s->buf_ptr;
407 if (len == 0)
408 break;
409 }
410 } else {
411 memcpy(buf, s->buf_ptr, len);
412 buf += len;
413 s->buf_ptr += len;
414 size -= len;
415 }
416 }
417 return size1 - size;
418 }
419
420 int get_partial_buffer(ByteIOContext *s, unsigned char *buf, int size)
421 {
422 int len;
423
424 if(size<0)
425 return -1;
426
427 len = s->buf_end - s->buf_ptr;
428 if (len == 0) {
429 fill_buffer(s);
430 len = s->buf_end - s->buf_ptr;
431 }
432 if (len > size)
433 len = size;
434 memcpy(buf, s->buf_ptr, len);
435 s->buf_ptr += len;
436 return len;
437 }
438
439 unsigned int get_le16(ByteIOContext *s)
440 {
441 unsigned int val;
442 val = get_byte(s);
443 val |= get_byte(s) << 8;
444 return val;
445 }
446
447 unsigned int get_le24(ByteIOContext *s)
448 {
449 unsigned int val;
450 val = get_le16(s);
451 val |= get_byte(s) << 16;
452 return val;
453 }
454
455 unsigned int get_le32(ByteIOContext *s)
456 {
457 unsigned int val;
458 val = get_le16(s);
459 val |= get_le16(s) << 16;
460 return val;
461 }
462
463 uint64_t get_le64(ByteIOContext *s)
464 {
465 uint64_t val;
466 val = (uint64_t)get_le32(s);
467 val |= (uint64_t)get_le32(s) << 32;
468 return val;
469 }
470
471 unsigned int get_be16(ByteIOContext *s)
472 {
473 unsigned int val;
474 val = get_byte(s) << 8;
475 val |= get_byte(s);
476 return val;
477 }
478
479 unsigned int get_be24(ByteIOContext *s)
480 {
481 unsigned int val;
482 val = get_be16(s) << 8;
483 val |= get_byte(s);
484 return val;
485 }
486 unsigned int get_be32(ByteIOContext *s)
487 {
488 unsigned int val;
489 val = get_be16(s) << 16;
490 val |= get_be16(s);
491 return val;
492 }
493
494 char *get_strz(ByteIOContext *s, char *buf, int maxlen)
495 {
496 int i = 0;
497 char c;
498
499 while ((c = get_byte(s))) {
500 if (i < maxlen-1)
501 buf[i++] = c;
502 }
503
504 buf[i] = 0; /* Ensure null terminated, but may be truncated */
505
506 return buf;
507 }
508
509 uint64_t get_be64(ByteIOContext *s)
510 {
511 uint64_t val;
512 val = (uint64_t)get_be32(s) << 32;
513 val |= (uint64_t)get_be32(s);
514 return val;
515 }
516
517 uint64_t ff_get_v(ByteIOContext *bc){
518 uint64_t val = 0;
519 int tmp;
520
521 do{
522 tmp = get_byte(bc);
523 val= (val<<7) + (tmp&127);
524 }while(tmp&128);
525 return val;
526 }
527
528 int url_fdopen(ByteIOContext **s, URLContext *h)
529 {
530 uint8_t *buffer;
531 int buffer_size, max_packet_size;
532
533
534 max_packet_size = url_get_max_packet_size(h);
535 if (max_packet_size) {
536 buffer_size = max_packet_size; /* no need to bufferize more than one packet */
537 } else {
538 buffer_size = IO_BUFFER_SIZE;
539 }
540 buffer = av_malloc(buffer_size);
541 if (!buffer)
542 return AVERROR(ENOMEM);
543
544 *s = av_mallocz(sizeof(ByteIOContext));
545 if(!*s) {
546 av_free(buffer);
547 return AVERROR(ENOMEM);
548 }
549
550 if (init_put_byte(*s, buffer, buffer_size,
551 (h->flags & URL_WRONLY || h->flags & URL_RDWR), h,
552 url_read, url_write, url_seek) < 0) {
553 av_free(buffer);
554 av_freep(s);
555 return AVERROR(EIO);
556 }
557 (*s)->is_streamed = h->is_streamed;
558 (*s)->max_packet_size = max_packet_size;
559 if(h->prot) {
560 (*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause;
561 (*s)->read_seek = (int64_t (*)(void *, int, int64_t, int))h->prot->url_read_seek;
562 }
563 return 0;
564 }
565
566 int url_setbufsize(ByteIOContext *s, int buf_size)
567 {
568 uint8_t *buffer;
569 buffer = av_malloc(buf_size);
570 if (!buffer)
571 return AVERROR(ENOMEM);
572
573 av_free(s->buffer);
574 s->buffer = buffer;
575 s->buffer_size = buf_size;
576 s->buf_ptr = buffer;
577 url_resetbuf(s, s->write_flag ? URL_WRONLY : URL_RDONLY);
578 return 0;
579 }
580
581 int url_resetbuf(ByteIOContext *s, int flags)
582 {
583 URLContext *h = s->opaque;
584 if ((flags & URL_RDWR) || (h && h->flags != flags && !h->flags & URL_RDWR))
585 return AVERROR(EINVAL);
586
587 if (flags & URL_WRONLY) {
588 s->buf_end = s->buffer + s->buffer_size;
589 s->write_flag = 1;
590 } else {
591 s->buf_end = s->buffer;
592 s->write_flag = 0;
593 }
594 return 0;
595 }
596
597 int url_fopen(ByteIOContext **s, const char *filename, int flags)
598 {
599 URLContext *h;
600 int err;
601
602 err = url_open(&h, filename, flags);
603 if (err < 0)
604 return err;
605 err = url_fdopen(s, h);
606 if (err < 0) {
607 url_close(h);
608 return err;
609 }
610 return 0;
611 }
612
613 int url_fclose(ByteIOContext *s)
614 {
615 URLContext *h = s->opaque;
616
617 av_free(s->buffer);
618 av_free(s);
619 return url_close(h);
620 }
621
622 URLContext *url_fileno(ByteIOContext *s)
623 {
624 return s->opaque;
625 }
626
627 #if CONFIG_MUXERS
628 int url_fprintf(ByteIOContext *s, const char *fmt, ...)
629 {
630 va_list ap;
631 char buf[4096];
632 int ret;
633
634 va_start(ap, fmt);
635 ret = vsnprintf(buf, sizeof(buf), fmt, ap);
636 va_end(ap);
637 put_buffer(s, buf, strlen(buf));
638 return ret;
639 }
640 #endif //CONFIG_MUXERS
641
642 char *url_fgets(ByteIOContext *s, char *buf, int buf_size)
643 {
644 int c;
645 char *q;
646
647 c = url_fgetc(s);
648 if (c == EOF)
649 return NULL;
650 q = buf;
651 for(;;) {
652 if (c == EOF || c == '\n')
653 break;
654 if ((q - buf) < buf_size - 1)
655 *q++ = c;
656 c = url_fgetc(s);
657 }
658 if (buf_size > 0)
659 *q = '\0';
660 return buf;
661 }
662
663 int url_fget_max_packet_size(ByteIOContext *s)
664 {
665 return s->max_packet_size;
666 }
667
668 int av_url_read_fpause(ByteIOContext *s, int pause)
669 {
670 if (!s->read_pause)
671 return AVERROR(ENOSYS);
672 return s->read_pause(s->opaque, pause);
673 }
674
675 int64_t av_url_read_fseek(ByteIOContext *s, int stream_index,
676 int64_t timestamp, int flags)
677 {
678 URLContext *h = s->opaque;
679 int64_t ret;
680 if (!s->read_seek)
681 return AVERROR(ENOSYS);
682 ret = s->read_seek(h, stream_index, timestamp, flags);
683 if(ret >= 0) {
684 s->buf_ptr = s->buf_end; // Flush buffer
685 s->pos = s->seek(h, 0, SEEK_CUR);
686 }
687 return ret;
688 }
689
690 /* url_open_dyn_buf and url_close_dyn_buf are used in rtp.c to send a response
691 * back to the server even if CONFIG_MUXERS is false. */
692 #if CONFIG_MUXERS || CONFIG_NETWORK
693 /* buffer handling */
694 int url_open_buf(ByteIOContext **s, uint8_t *buf, int buf_size, int flags)
695 {
696 int ret;
697 *s = av_mallocz(sizeof(ByteIOContext));
698 if(!*s)
699 return AVERROR(ENOMEM);
700 ret = init_put_byte(*s, buf, buf_size,
701 (flags & URL_WRONLY || flags & URL_RDWR),
702 NULL, NULL, NULL, NULL);
703 if(ret != 0)
704 av_freep(s);
705 return ret;
706 }
707
708 int url_close_buf(ByteIOContext *s)
709 {
710 put_flush_packet(s);
711 return s->buf_ptr - s->buffer;
712 }
713
714 /* output in a dynamic buffer */
715
716 typedef struct DynBuffer {
717 int pos, size, allocated_size;
718 uint8_t *buffer;
719 int io_buffer_size;
720 uint8_t io_buffer[1];
721 } DynBuffer;
722
723 static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
724 {
725 DynBuffer *d = opaque;
726 unsigned new_size, new_allocated_size;
727
728 /* reallocate buffer if needed */
729 new_size = d->pos + buf_size;
730 new_allocated_size = d->allocated_size;
731 if(new_size < d->pos || new_size > INT_MAX/2)
732 return -1;
733 while (new_size > new_allocated_size) {
734 if (!new_allocated_size)
735 new_allocated_size = new_size;
736 else
737 new_allocated_size += new_allocated_size / 2 + 1;
738 }
739
740 if (new_allocated_size > d->allocated_size) {
741 d->buffer = av_realloc(d->buffer, new_allocated_size);
742 if(d->buffer == NULL)
743 return AVERROR(ENOMEM);
744 d->allocated_size = new_allocated_size;
745 }
746 memcpy(d->buffer + d->pos, buf, buf_size);
747 d->pos = new_size;
748 if (d->pos > d->size)
749 d->size = d->pos;
750 return buf_size;
751 }
752
753 static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
754 {
755 unsigned char buf1[4];
756 int ret;
757
758 /* packetized write: output the header */
759 buf1[0] = (buf_size >> 24);
760 buf1[1] = (buf_size >> 16);
761 buf1[2] = (buf_size >> 8);
762 buf1[3] = (buf_size);
763 ret= dyn_buf_write(opaque, buf1, 4);
764 if(ret < 0)
765 return ret;
766
767 /* then the data */
768 return dyn_buf_write(opaque, buf, buf_size);
769 }
770
771 static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
772 {
773 DynBuffer *d = opaque;
774
775 if (whence == SEEK_CUR)
776 offset += d->pos;
777 else if (whence == SEEK_END)
778 offset += d->size;
779 if (offset < 0 || offset > 0x7fffffffLL)
780 return -1;
781 d->pos = offset;
782 return 0;
783 }
784
785 static int url_open_dyn_buf_internal(ByteIOContext **s, int max_packet_size)
786 {
787 DynBuffer *d;
788 int io_buffer_size, ret;
789
790 if (max_packet_size)
791 io_buffer_size = max_packet_size;
792 else
793 io_buffer_size = 1024;
794
795 if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
796 return -1;
797 d = av_malloc(sizeof(DynBuffer) + io_buffer_size);
798 if (!d)
799 return -1;
800 *s = av_mallocz(sizeof(ByteIOContext));
801 if(!*s) {
802 av_free(d);
803 return AVERROR(ENOMEM);
804 }
805 d->io_buffer_size = io_buffer_size;
806 d->buffer = NULL;
807 d->pos = 0;
808 d->size = 0;
809 d->allocated_size = 0;
810 ret = init_put_byte(*s, d->io_buffer, io_buffer_size,
811 1, d, NULL,
812 max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
813 max_packet_size ? NULL : dyn_buf_seek);
814 if (ret == 0) {
815 (*s)->max_packet_size = max_packet_size;
816 } else {
817 av_free(d);
818 av_freep(s);
819 }
820 return ret;
821 }
822
823 int url_open_dyn_buf(ByteIOContext **s)
824 {
825 return url_open_dyn_buf_internal(s, 0);
826 }
827
828 int url_open_dyn_packet_buf(ByteIOContext **s, int max_packet_size)
829 {
830 if (max_packet_size <= 0)
831 return -1;
832 return url_open_dyn_buf_internal(s, max_packet_size);
833 }
834
835 int url_close_dyn_buf(ByteIOContext *s, uint8_t **pbuffer)
836 {
837 DynBuffer *d = s->opaque;
838 int size;
839
840 put_flush_packet(s);
841
842 *pbuffer = d->buffer;
843 size = d->size;
844 av_free(d);
845 av_free(s);
846 return size;
847 }
848 #endif /* CONFIG_MUXERS || CONFIG_NETWORK */