malloc padding to avoid reading past the malloc()ed area.
[libav.git] / libavformat / aviobuf.c
CommitLineData
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1/*
2 * Buffered I/O for ffmpeg system
19720f15 3 * Copyright (c) 2000,2001 Fabrice Bellard
de6d9b64 4 *
19720f15
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5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
de6d9b64 9 *
19720f15 10 * This library is distributed in the hope that it will be useful,
de6d9b64 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19720f15
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
de6d9b64 14 *
19720f15
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15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
de6d9b64 18 */
de6d9b64 19#include "avformat.h"
5c91a675 20#include "avio.h"
abba3dd1 21#include <stdarg.h>
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22
23#define IO_BUFFER_SIZE 32768
24
25int init_put_byte(ByteIOContext *s,
26 unsigned char *buffer,
27 int buffer_size,
28 int write_flag,
29 void *opaque,
0c1a9eda 30 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
576ae256 31 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
536ffa59 32 offset_t (*seek)(void *opaque, offset_t offset, int whence))
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FB
33{
34 s->buffer = buffer;
35 s->buffer_size = buffer_size;
36 s->buf_ptr = buffer;
37 s->write_flag = write_flag;
38 if (!s->write_flag)
39 s->buf_end = buffer;
40 else
41 s->buf_end = buffer + buffer_size;
42 s->opaque = opaque;
43 s->write_packet = write_packet;
44 s->read_packet = read_packet;
45 s->seek = seek;
46 s->pos = 0;
47 s->must_flush = 0;
48 s->eof_reached = 0;
576ae256 49 s->error = 0;
de6d9b64 50 s->is_streamed = 0;
abba3dd1 51 s->max_packet_size = 0;
ee9f36a8 52 s->update_checksum= NULL;
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53 return 0;
54}
55
56
a9e35095 57#ifdef CONFIG_MUXERS
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58static void flush_buffer(ByteIOContext *s)
59{
60 if (s->buf_ptr > s->buffer) {
576ae256
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61 if (s->write_packet && !s->error){
62 int ret= s->write_packet(s->opaque, s->buffer, s->buf_ptr - s->buffer);
63 if(ret < 0){
64 s->error = ret;
65 }
66 }
465e1dad 67 if(s->update_checksum){
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68 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
69 s->checksum_ptr= s->buffer;
70 }
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71 s->pos += s->buf_ptr - s->buffer;
72 }
73 s->buf_ptr = s->buffer;
74}
75
76void put_byte(ByteIOContext *s, int b)
77{
78 *(s->buf_ptr)++ = b;
79 if (s->buf_ptr >= s->buf_end)
80 flush_buffer(s);
81}
82
75bdb984 83void put_buffer(ByteIOContext *s, const unsigned char *buf, int size)
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84{
85 int len;
86
87 while (size > 0) {
88 len = (s->buf_end - s->buf_ptr);
89 if (len > size)
90 len = size;
91 memcpy(s->buf_ptr, buf, len);
92 s->buf_ptr += len;
93
94 if (s->buf_ptr >= s->buf_end)
95 flush_buffer(s);
96
97 buf += len;
98 size -= len;
99 }
100}
101
102void put_flush_packet(ByteIOContext *s)
103{
104 flush_buffer(s);
105 s->must_flush = 0;
106}
a9e35095 107#endif //CONFIG_MUXERS
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108
109offset_t url_fseek(ByteIOContext *s, offset_t offset, int whence)
110{
111 offset_t offset1;
112
113 if (whence != SEEK_CUR && whence != SEEK_SET)
114 return -EINVAL;
115
a9e35095 116#ifdef CONFIG_MUXERS
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117 if (s->write_flag) {
118 if (whence == SEEK_CUR) {
4606ac8d 119 offset1 = s->pos + (s->buf_ptr - s->buffer);
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120 if (offset == 0)
121 return offset1;
122 offset += offset1;
123 }
124 offset1 = offset - s->pos;
125 if (!s->must_flush &&
126 offset1 >= 0 && offset1 < (s->buf_end - s->buffer)) {
127 /* can do the seek inside the buffer */
128 s->buf_ptr = s->buffer + offset1;
129 } else {
130 if (!s->seek)
131 return -EPIPE;
132 flush_buffer(s);
133 s->must_flush = 1;
134 s->buf_ptr = s->buffer;
135 s->seek(s->opaque, offset, SEEK_SET);
136 s->pos = offset;
137 }
764ef400 138 } else
a9e35095 139#endif //CONFIG_MUXERS
764ef400 140 {
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141 if (whence == SEEK_CUR) {
142 offset1 = s->pos - (s->buf_end - s->buffer) + (s->buf_ptr - s->buffer);
143 if (offset == 0)
144 return offset1;
145 offset += offset1;
146 }
147 offset1 = offset - (s->pos - (s->buf_end - s->buffer));
148 if (offset1 >= 0 && offset1 <= (s->buf_end - s->buffer)) {
149 /* can do the seek inside the buffer */
150 s->buf_ptr = s->buffer + offset1;
151 } else {
152 if (!s->seek)
153 return -EPIPE;
154 s->buf_ptr = s->buffer;
155 s->buf_end = s->buffer;
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156 if (s->seek(s->opaque, offset, SEEK_SET) == (offset_t)-EPIPE)
157 return -EPIPE;
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158 s->pos = offset;
159 }
abba3dd1 160 s->eof_reached = 0;
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161 }
162 return offset;
163}
164
165void url_fskip(ByteIOContext *s, offset_t offset)
166{
167 url_fseek(s, offset, SEEK_CUR);
168}
169
170offset_t url_ftell(ByteIOContext *s)
171{
172 return url_fseek(s, 0, SEEK_CUR);
173}
174
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175offset_t url_fsize(ByteIOContext *s)
176{
177 offset_t size;
178
179 if (!s->seek)
180 return -EPIPE;
181 size = s->seek(s->opaque, -1, SEEK_END) + 1;
182 s->seek(s->opaque, s->pos, SEEK_SET);
183 return size;
184}
185
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186int url_feof(ByteIOContext *s)
187{
188 return s->eof_reached;
189}
190
576ae256
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191int url_ferror(ByteIOContext *s)
192{
193 return s->error;
194}
195
a9e35095 196#ifdef CONFIG_MUXERS
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197void put_le32(ByteIOContext *s, unsigned int val)
198{
199 put_byte(s, val);
200 put_byte(s, val >> 8);
201 put_byte(s, val >> 16);
202 put_byte(s, val >> 24);
203}
204
205void put_be32(ByteIOContext *s, unsigned int val)
206{
207 put_byte(s, val >> 24);
208 put_byte(s, val >> 16);
209 put_byte(s, val >> 8);
210 put_byte(s, val);
211}
212
3b4b29dc 213void put_strz(ByteIOContext *s, const char *str)
75bdb984
PG
214{
215 if (str)
216 put_buffer(s, (const unsigned char *) str, strlen(str) + 1);
217 else
218 put_byte(s, 0);
219}
220
0c1a9eda 221void put_le64(ByteIOContext *s, uint64_t val)
de6d9b64 222{
0c1a9eda
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223 put_le32(s, (uint32_t)(val & 0xffffffff));
224 put_le32(s, (uint32_t)(val >> 32));
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225}
226
0c1a9eda 227void put_be64(ByteIOContext *s, uint64_t val)
de6d9b64 228{
0c1a9eda
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229 put_be32(s, (uint32_t)(val >> 32));
230 put_be32(s, (uint32_t)(val & 0xffffffff));
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231}
232
233void put_le16(ByteIOContext *s, unsigned int val)
234{
235 put_byte(s, val);
236 put_byte(s, val >> 8);
237}
238
239void put_be16(ByteIOContext *s, unsigned int val)
240{
241 put_byte(s, val >> 8);
242 put_byte(s, val);
243}
244
a254c574
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245void put_be24(ByteIOContext *s, unsigned int val)
246{
247 put_be16(s, val >> 8);
248 put_byte(s, val);
249}
250
0570bf06 251void put_tag(ByteIOContext *s, const char *tag)
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252{
253 while (*tag) {
254 put_byte(s, *tag++);
255 }
256}
a9e35095 257#endif //CONFIG_MUXERS
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258
259/* Input stream */
260
261static void fill_buffer(ByteIOContext *s)
262{
263 int len;
264
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265 /* no need to do anything if EOF already reached */
266 if (s->eof_reached)
267 return;
ee9f36a8 268
465e1dad 269 if(s->update_checksum){
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270 if(s->buf_end > s->checksum_ptr)
271 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr);
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272 s->checksum_ptr= s->buffer;
273 }
274
de6d9b64 275 len = s->read_packet(s->opaque, s->buffer, s->buffer_size);
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276 if (len <= 0) {
277 /* do not modify buffer if EOF reached so that a seek back can
278 be done without rereading data */
de6d9b64 279 s->eof_reached = 1;
576ae256
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280 if(len<0)
281 s->error= len;
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282 } else {
283 s->pos += len;
284 s->buf_ptr = s->buffer;
285 s->buf_end = s->buffer + len;
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286 }
287}
288
ee9f36a8
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289unsigned long get_checksum(ByteIOContext *s){
290 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
465e1dad 291 s->update_checksum= NULL;
ee9f36a8
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292 return s->checksum;
293}
294
295void init_checksum(ByteIOContext *s, unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len), unsigned long checksum){
296 s->update_checksum= update_checksum;
465e1dad
MN
297 if(s->update_checksum){
298 s->checksum= s->update_checksum(checksum, NULL, 0);
299 s->checksum_ptr= s->buf_ptr;
300 }
ee9f36a8
MN
301}
302
abba3dd1
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303/* NOTE: return 0 if EOF, so you cannot use it if EOF handling is
304 necessary */
305/* XXX: put an inline version */
de6d9b64
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306int get_byte(ByteIOContext *s)
307{
308 if (s->buf_ptr < s->buf_end) {
309 return *s->buf_ptr++;
310 } else {
311 fill_buffer(s);
312 if (s->buf_ptr < s->buf_end)
313 return *s->buf_ptr++;
314 else
315 return 0;
316 }
317}
318
abba3dd1
FB
319/* NOTE: return URL_EOF (-1) if EOF */
320int url_fgetc(ByteIOContext *s)
321{
322 if (s->buf_ptr < s->buf_end) {
323 return *s->buf_ptr++;
324 } else {
325 fill_buffer(s);
326 if (s->buf_ptr < s->buf_end)
327 return *s->buf_ptr++;
328 else
329 return URL_EOF;
330 }
331}
332
de6d9b64
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333int get_buffer(ByteIOContext *s, unsigned char *buf, int size)
334{
335 int len, size1;
336
337 size1 = size;
338 while (size > 0) {
339 len = s->buf_end - s->buf_ptr;
340 if (len > size)
341 len = size;
342 if (len == 0) {
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MN
343 if(size > s->buffer_size && !s->update_checksum){
344 len = s->read_packet(s->opaque, buf, size);
345 if (len <= 0) {
346 /* do not modify buffer if EOF reached so that a seek back can
347 be done without rereading data */
348 s->eof_reached = 1;
349 if(len<0)
350 s->error= len;
351 break;
352 } else {
353 s->pos += len;
354 size -= len;
355 buf += len;
356 s->buf_ptr = s->buffer;
357 s->buf_end = s->buffer/* + len*/;
358 }
359 }else{
360 fill_buffer(s);
361 len = s->buf_end - s->buf_ptr;
362 if (len == 0)
363 break;
364 }
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365 } else {
366 memcpy(buf, s->buf_ptr, len);
367 buf += len;
368 s->buf_ptr += len;
369 size -= len;
370 }
371 }
372 return size1 - size;
373}
374
e15dec10
LS
375int get_partial_buffer(ByteIOContext *s, unsigned char *buf, int size)
376{
377 int len;
0ecca7a4
MN
378
379 if(size<0)
380 return -1;
e15dec10
LS
381
382 len = s->buf_end - s->buf_ptr;
383 if (len == 0) {
384 fill_buffer(s);
385 len = s->buf_end - s->buf_ptr;
386 }
387 if (len > size)
388 len = size;
389 memcpy(buf, s->buf_ptr, len);
390 s->buf_ptr += len;
391 return len;
392}
393
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394unsigned int get_le16(ByteIOContext *s)
395{
396 unsigned int val;
397 val = get_byte(s);
398 val |= get_byte(s) << 8;
399 return val;
400}
401
402unsigned int get_le32(ByteIOContext *s)
403{
404 unsigned int val;
a254c574
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405 val = get_le16(s);
406 val |= get_le16(s) << 16;
de6d9b64
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407 return val;
408}
409
0c1a9eda 410uint64_t get_le64(ByteIOContext *s)
de6d9b64 411{
0c1a9eda
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412 uint64_t val;
413 val = (uint64_t)get_le32(s);
414 val |= (uint64_t)get_le32(s) << 32;
de6d9b64
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415 return val;
416}
417
418unsigned int get_be16(ByteIOContext *s)
419{
420 unsigned int val;
421 val = get_byte(s) << 8;
422 val |= get_byte(s);
423 return val;
424}
425
a254c574 426unsigned int get_be24(ByteIOContext *s)
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427{
428 unsigned int val;
a254c574 429 val = get_be16(s) << 8;
de6d9b64
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430 val |= get_byte(s);
431 return val;
432}
a254c574
MN
433unsigned int get_be32(ByteIOContext *s)
434{
435 unsigned int val;
436 val = get_be16(s) << 16;
437 val |= get_be16(s);
438 return val;
439}
de6d9b64 440
3b4b29dc 441char *get_strz(ByteIOContext *s, char *buf, int maxlen)
75bdb984
PG
442{
443 int i = 0;
444 char c;
445
446 while ((c = get_byte(s))) {
447 if (i < maxlen-1)
448 buf[i++] = c;
449 }
450
451 buf[i] = 0; /* Ensure null terminated, but may be truncated */
452
453 return buf;
454}
455
0c1a9eda 456uint64_t get_be64(ByteIOContext *s)
de6d9b64 457{
0c1a9eda
ZK
458 uint64_t val;
459 val = (uint64_t)get_be32(s) << 32;
460 val |= (uint64_t)get_be32(s);
de6d9b64
FB
461 return val;
462}
463
464/* link with avio functions */
465
a9e35095 466#ifdef CONFIG_MUXERS
576ae256 467static int url_write_packet(void *opaque, uint8_t *buf, int buf_size)
de6d9b64
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468{
469 URLContext *h = opaque;
576ae256 470 return url_write(h, buf, buf_size);
de6d9b64 471}
764ef400
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472#else
473#define url_write_packet NULL
a9e35095 474#endif //CONFIG_MUXERS
de6d9b64 475
0c1a9eda 476static int url_read_packet(void *opaque, uint8_t *buf, int buf_size)
de6d9b64
FB
477{
478 URLContext *h = opaque;
479 return url_read(h, buf, buf_size);
480}
481
536ffa59 482static offset_t url_seek_packet(void *opaque, offset_t offset, int whence)
de6d9b64
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483{
484 URLContext *h = opaque;
53e2f9ca
MN
485 return url_seek(h, offset, whence);
486 //return 0;
de6d9b64
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487}
488
489int url_fdopen(ByteIOContext *s, URLContext *h)
490{
0c1a9eda 491 uint8_t *buffer;
abba3dd1 492 int buffer_size, max_packet_size;
de6d9b64 493
abba3dd1
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494
495 max_packet_size = url_get_max_packet_size(h);
496 if (max_packet_size) {
497 buffer_size = max_packet_size; /* no need to bufferize more than one packet */
498 } else {
499 buffer_size = IO_BUFFER_SIZE;
500 }
1ea4f593 501 buffer = av_malloc(buffer_size);
de6d9b64
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502 if (!buffer)
503 return -ENOMEM;
504
505 if (init_put_byte(s, buffer, buffer_size,
ac9fe33d 506 (h->flags & URL_WRONLY || h->flags & URL_RDWR), h,
de6d9b64 507 url_read_packet, url_write_packet, url_seek_packet) < 0) {
1ea4f593 508 av_free(buffer);
0bd586c5 509 return AVERROR_IO;
de6d9b64
FB
510 }
511 s->is_streamed = h->is_streamed;
abba3dd1 512 s->max_packet_size = max_packet_size;
de6d9b64
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513 return 0;
514}
515
516/* XXX: must be called before any I/O */
517int url_setbufsize(ByteIOContext *s, int buf_size)
518{
0c1a9eda 519 uint8_t *buffer;
1ea4f593 520 buffer = av_malloc(buf_size);
de6d9b64
FB
521 if (!buffer)
522 return -ENOMEM;
523
1ea4f593 524 av_free(s->buffer);
de6d9b64
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525 s->buffer = buffer;
526 s->buffer_size = buf_size;
527 s->buf_ptr = buffer;
528 if (!s->write_flag)
529 s->buf_end = buffer;
530 else
531 s->buf_end = buffer + buf_size;
532 return 0;
533}
534
abba3dd1
FB
535/* NOTE: when opened as read/write, the buffers are only used for
536 reading */
de6d9b64
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537int url_fopen(ByteIOContext *s, const char *filename, int flags)
538{
539 URLContext *h;
540 int err;
541
542 err = url_open(&h, filename, flags);
543 if (err < 0)
544 return err;
545 err = url_fdopen(s, h);
546 if (err < 0) {
547 url_close(h);
548 return err;
549 }
550 return 0;
551}
552
553int url_fclose(ByteIOContext *s)
554{
555 URLContext *h = s->opaque;
556
1ea4f593 557 av_free(s->buffer);
de6d9b64
FB
558 memset(s, 0, sizeof(ByteIOContext));
559 return url_close(h);
560}
561
562URLContext *url_fileno(ByteIOContext *s)
563{
564 return s->opaque;
565}
566
a9e35095 567#ifdef CONFIG_MUXERS
abba3dd1
FB
568/* XXX: currently size is limited */
569int url_fprintf(ByteIOContext *s, const char *fmt, ...)
570{
571 va_list ap;
572 char buf[4096];
573 int ret;
574
575 va_start(ap, fmt);
576 ret = vsnprintf(buf, sizeof(buf), fmt, ap);
577 va_end(ap);
578 put_buffer(s, buf, strlen(buf));
579 return ret;
580}
a9e35095 581#endif //CONFIG_MUXERS
abba3dd1
FB
582
583/* note: unlike fgets, the EOL character is not returned and a whole
584 line is parsed. return NULL if first char read was EOF */
585char *url_fgets(ByteIOContext *s, char *buf, int buf_size)
586{
587 int c;
588 char *q;
589
590 c = url_fgetc(s);
591 if (c == EOF)
592 return NULL;
593 q = buf;
594 for(;;) {
595 if (c == EOF || c == '\n')
596 break;
597 if ((q - buf) < buf_size - 1)
598 *q++ = c;
599 c = url_fgetc(s);
600 }
601 if (buf_size > 0)
602 *q = '\0';
603 return buf;
604}
605
606/*
607 * Return the maximum packet size associated to packetized buffered file
608 * handle. If the file is not packetized (stream like http or file on
609 * disk), then 0 is returned.
610 *
611 * @param h buffered file handle
612 * @return maximum packet size in bytes
613 */
614int url_fget_max_packet_size(ByteIOContext *s)
615{
616 return s->max_packet_size;
617}
618
a9e35095 619#ifdef CONFIG_MUXERS
de6d9b64 620/* buffer handling */
0c1a9eda 621int url_open_buf(ByteIOContext *s, uint8_t *buf, int buf_size, int flags)
de6d9b64
FB
622{
623 return init_put_byte(s, buf, buf_size,
ac9fe33d
GB
624 (flags & URL_WRONLY || flags & URL_RDWR),
625 NULL, NULL, NULL, NULL);
de6d9b64
FB
626}
627
628/* return the written or read size */
629int url_close_buf(ByteIOContext *s)
630{
abba3dd1 631 put_flush_packet(s);
de6d9b64
FB
632 return s->buf_ptr - s->buffer;
633}
abba3dd1
FB
634
635/* output in a dynamic buffer */
636
637typedef struct DynBuffer {
638 int pos, size, allocated_size;
0c1a9eda 639 uint8_t *buffer;
abba3dd1 640 int io_buffer_size;
0c1a9eda 641 uint8_t io_buffer[1];
abba3dd1
FB
642} DynBuffer;
643
576ae256 644static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
abba3dd1
FB
645{
646 DynBuffer *d = opaque;
647 int new_size, new_allocated_size;
abba3dd1
FB
648
649 /* reallocate buffer if needed */
650 new_size = d->pos + buf_size;
651 new_allocated_size = d->allocated_size;
568e18b1
MN
652 if(new_size < d->pos || new_size > INT_MAX/2)
653 return -1;
abba3dd1
FB
654 while (new_size > new_allocated_size) {
655 if (!new_allocated_size)
656 new_allocated_size = new_size;
657 else
568e18b1 658 new_allocated_size += new_allocated_size / 2 + 1;
abba3dd1
FB
659 }
660
661 if (new_allocated_size > d->allocated_size) {
b88ba823
MH
662 d->buffer = av_realloc(d->buffer, new_allocated_size);
663 if(d->buffer == NULL)
576ae256 664 return -1234;
abba3dd1
FB
665 d->allocated_size = new_allocated_size;
666 }
667 memcpy(d->buffer + d->pos, buf, buf_size);
668 d->pos = new_size;
669 if (d->pos > d->size)
670 d->size = d->pos;
576ae256 671 return buf_size;
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672}
673
576ae256 674static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
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675{
676 unsigned char buf1[4];
576ae256 677 int ret;
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678
679 /* packetized write: output the header */
680 buf1[0] = (buf_size >> 24);
681 buf1[1] = (buf_size >> 16);
682 buf1[2] = (buf_size >> 8);
683 buf1[3] = (buf_size);
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684 ret= dyn_buf_write(opaque, buf1, 4);
685 if(ret < 0)
686 return ret;
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687
688 /* then the data */
576ae256 689 return dyn_buf_write(opaque, buf, buf_size);
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690}
691
536ffa59 692static offset_t dyn_buf_seek(void *opaque, offset_t offset, int whence)
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693{
694 DynBuffer *d = opaque;
695
696 if (whence == SEEK_CUR)
697 offset += d->pos;
698 else if (whence == SEEK_END)
699 offset += d->size;
700 if (offset < 0 || offset > 0x7fffffffLL)
701 return -1;
702 d->pos = offset;
703 return 0;
704}
705
706static int url_open_dyn_buf_internal(ByteIOContext *s, int max_packet_size)
707{
708 DynBuffer *d;
709 int io_buffer_size, ret;
710
711 if (max_packet_size)
712 io_buffer_size = max_packet_size;
713 else
714 io_buffer_size = 1024;
715
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716 if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
717 return -1;
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718 d = av_malloc(sizeof(DynBuffer) + io_buffer_size);
719 if (!d)
720 return -1;
721 d->io_buffer_size = io_buffer_size;
722 d->buffer = NULL;
723 d->pos = 0;
724 d->size = 0;
725 d->allocated_size = 0;
726 ret = init_put_byte(s, d->io_buffer, io_buffer_size,
727 1, d, NULL,
728 max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
729 max_packet_size ? NULL : dyn_buf_seek);
730 if (ret == 0) {
731 s->max_packet_size = max_packet_size;
732 }
733 return ret;
734}
735
736/*
737 * Open a write only memory stream.
738 *
739 * @param s new IO context
740 * @return zero if no error.
741 */
742int url_open_dyn_buf(ByteIOContext *s)
743{
744 return url_open_dyn_buf_internal(s, 0);
745}
746
747/*
748 * Open a write only packetized memory stream with a maximum packet
749 * size of 'max_packet_size'. The stream is stored in a memory buffer
750 * with a big endian 4 byte header giving the packet size in bytes.
751 *
752 * @param s new IO context
753 * @param max_packet_size maximum packet size (must be > 0)
754 * @return zero if no error.
755 */
756int url_open_dyn_packet_buf(ByteIOContext *s, int max_packet_size)
757{
758 if (max_packet_size <= 0)
759 return -1;
760 return url_open_dyn_buf_internal(s, max_packet_size);
761}
762
763/*
764 * Return the written size and a pointer to the buffer. The buffer
765 * must be freed with av_free().
766 * @param s IO context
767 * @param pointer to a byte buffer
768 * @return the length of the byte buffer
769 */
0c1a9eda 770int url_close_dyn_buf(ByteIOContext *s, uint8_t **pbuffer)
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771{
772 DynBuffer *d = s->opaque;
773 int size;
774
775 put_flush_packet(s);
776
777 *pbuffer = d->buffer;
778 size = d->size;
779 av_free(d);
780 return size;
781}
a9e35095 782#endif //CONFIG_MUXERS