MLP/TrueHD parser
[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 *
b78e7197
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5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
19720f15
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8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
b78e7197 10 * version 2.1 of the License, or (at your option) any later version.
de6d9b64 11 *
b78e7197 12 * FFmpeg is distributed in the hope that it will be useful,
de6d9b64 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
de6d9b64 16 *
19720f15 17 * You should have received a copy of the GNU Lesser General Public
b78e7197 18 * License along with FFmpeg; if not, write to the Free Software
5509bffa 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
de6d9b64 20 */
de6d9b64 21#include "avformat.h"
5c91a675 22#include "avio.h"
992e78f5 23#include "crc.h"
abba3dd1 24#include <stdarg.h>
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25
26#define IO_BUFFER_SIZE 32768
27
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28static void fill_buffer(ByteIOContext *s);
29
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30int init_put_byte(ByteIOContext *s,
31 unsigned char *buffer,
32 int buffer_size,
33 int write_flag,
34 void *opaque,
0c1a9eda 35 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
576ae256 36 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
536ffa59 37 offset_t (*seek)(void *opaque, offset_t offset, int whence))
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38{
39 s->buffer = buffer;
40 s->buffer_size = buffer_size;
41 s->buf_ptr = buffer;
770d9daf 42 url_resetbuf(s, write_flag ? URL_WRONLY : URL_RDONLY);
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43 s->opaque = opaque;
44 s->write_packet = write_packet;
45 s->read_packet = read_packet;
46 s->seek = seek;
47 s->pos = 0;
48 s->must_flush = 0;
49 s->eof_reached = 0;
576ae256 50 s->error = 0;
de6d9b64 51 s->is_streamed = 0;
abba3dd1 52 s->max_packet_size = 0;
ee9f36a8 53 s->update_checksum= NULL;
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54 if(!read_packet && !write_flag){
55 s->pos = buffer_size;
56 s->buf_end = s->buffer + buffer_size;
57 }
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58 return 0;
59}
115329f1 60
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61static void flush_buffer(ByteIOContext *s)
62{
63 if (s->buf_ptr > s->buffer) {
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64 if (s->write_packet && !s->error){
65 int ret= s->write_packet(s->opaque, s->buffer, s->buf_ptr - s->buffer);
66 if(ret < 0){
67 s->error = ret;
68 }
69 }
465e1dad 70 if(s->update_checksum){
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71 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
72 s->checksum_ptr= s->buffer;
73 }
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74 s->pos += s->buf_ptr - s->buffer;
75 }
76 s->buf_ptr = s->buffer;
77}
78
79void put_byte(ByteIOContext *s, int b)
80{
81 *(s->buf_ptr)++ = b;
115329f1 82 if (s->buf_ptr >= s->buf_end)
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83 flush_buffer(s);
84}
85
75bdb984 86void put_buffer(ByteIOContext *s, const unsigned char *buf, int size)
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87{
88 int len;
89
90 while (size > 0) {
91 len = (s->buf_end - s->buf_ptr);
92 if (len > size)
93 len = size;
94 memcpy(s->buf_ptr, buf, len);
95 s->buf_ptr += len;
96
115329f1 97 if (s->buf_ptr >= s->buf_end)
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98 flush_buffer(s);
99
100 buf += len;
101 size -= len;
102 }
103}
104
105void put_flush_packet(ByteIOContext *s)
106{
107 flush_buffer(s);
108 s->must_flush = 0;
109}
110
111offset_t url_fseek(ByteIOContext *s, offset_t offset, int whence)
112{
113 offset_t offset1;
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114 offset_t pos;
115
116 if(!s)
117 return AVERROR(EINVAL);
118
119 pos = s->pos - (s->write_flag ? 0 : (s->buf_end - s->buffer));
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120
121 if (whence != SEEK_CUR && whence != SEEK_SET)
8fa36ae0 122 return AVERROR(EINVAL);
115329f1 123
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124 if (whence == SEEK_CUR) {
125 offset1 = pos + (s->buf_ptr - s->buffer);
126 if (offset == 0)
127 return offset1;
128 offset += offset1;
129 }
130 offset1 = offset - pos;
131 if (!s->must_flush &&
132 offset1 >= 0 && offset1 < (s->buf_end - s->buffer)) {
133 /* can do the seek inside the buffer */
134 s->buf_ptr = s->buffer + offset1;
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135 } else if(s->is_streamed && !s->write_flag &&
136 offset1 >= 0 && offset1 < (s->buf_end - s->buffer) + (1<<16)){
137 while(s->pos < offset && !s->eof_reached)
138 fill_buffer(s);
139 s->buf_ptr = s->buf_end + offset - s->pos;
f40d1739 140 } else {
8fa36ae0 141 offset_t res = AVERROR(EPIPE);
68fcdbf1 142
8fa641f8 143#if defined(CONFIG_MUXERS) || defined(CONFIG_NETWORK)
f40d1739 144 if (s->write_flag) {
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145 flush_buffer(s);
146 s->must_flush = 1;
f40d1739 147 } else
8fa641f8 148#endif /* defined(CONFIG_MUXERS) || defined(CONFIG_NETWORK) */
f40d1739 149 {
de6d9b64 150 s->buf_end = s->buffer;
de6d9b64 151 }
f40d1739 152 s->buf_ptr = s->buffer;
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153 if (!s->seek || (res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
154 return res;
f40d1739 155 s->pos = offset;
de6d9b64 156 }
f40d1739 157 s->eof_reached = 0;
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158 return offset;
159}
160
161void url_fskip(ByteIOContext *s, offset_t offset)
162{
163 url_fseek(s, offset, SEEK_CUR);
164}
165
166offset_t url_ftell(ByteIOContext *s)
167{
168 return url_fseek(s, 0, SEEK_CUR);
169}
170
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171offset_t url_fsize(ByteIOContext *s)
172{
173 offset_t size;
115329f1 174
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175 if(!s)
176 return AVERROR(EINVAL);
177
a965c478 178 if (!s->seek)
8fa36ae0 179 return AVERROR(EPIPE);
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180 size = s->seek(s->opaque, 0, AVSEEK_SIZE);
181 if(size<0){
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182 if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
183 return size;
184 size++;
1ae2c5f2 185 s->seek(s->opaque, s->pos, SEEK_SET);
8e287af0 186 }
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187 return size;
188}
189
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190int url_feof(ByteIOContext *s)
191{
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192 if(!s)
193 return 0;
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194 return s->eof_reached;
195}
196
576ae256
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197int url_ferror(ByteIOContext *s)
198{
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199 if(!s)
200 return 0;
576ae256
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201 return s->error;
202}
203
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204void put_le32(ByteIOContext *s, unsigned int val)
205{
206 put_byte(s, val);
207 put_byte(s, val >> 8);
208 put_byte(s, val >> 16);
209 put_byte(s, val >> 24);
210}
211
212void put_be32(ByteIOContext *s, unsigned int val)
213{
214 put_byte(s, val >> 24);
215 put_byte(s, val >> 16);
216 put_byte(s, val >> 8);
217 put_byte(s, val);
218}
219
3b4b29dc 220void put_strz(ByteIOContext *s, const char *str)
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221{
222 if (str)
223 put_buffer(s, (const unsigned char *) str, strlen(str) + 1);
224 else
225 put_byte(s, 0);
226}
227
0c1a9eda 228void put_le64(ByteIOContext *s, uint64_t val)
de6d9b64 229{
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230 put_le32(s, (uint32_t)(val & 0xffffffff));
231 put_le32(s, (uint32_t)(val >> 32));
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232}
233
0c1a9eda 234void put_be64(ByteIOContext *s, uint64_t val)
de6d9b64 235{
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236 put_be32(s, (uint32_t)(val >> 32));
237 put_be32(s, (uint32_t)(val & 0xffffffff));
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238}
239
240void put_le16(ByteIOContext *s, unsigned int val)
241{
242 put_byte(s, val);
243 put_byte(s, val >> 8);
244}
245
246void put_be16(ByteIOContext *s, unsigned int val)
247{
248 put_byte(s, val >> 8);
249 put_byte(s, val);
250}
251
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252void put_le24(ByteIOContext *s, unsigned int val)
253{
254 put_le16(s, val & 0xffff);
255 put_byte(s, val >> 16);
256}
257
a254c574
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258void put_be24(ByteIOContext *s, unsigned int val)
259{
260 put_be16(s, val >> 8);
261 put_byte(s, val);
262}
263
0570bf06 264void put_tag(ByteIOContext *s, const char *tag)
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265{
266 while (*tag) {
267 put_byte(s, *tag++);
268 }
269}
270
271/* Input stream */
272
273static void fill_buffer(ByteIOContext *s)
274{
602dd8f6 275 int len=0;
de6d9b64 276
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277 /* no need to do anything if EOF already reached */
278 if (s->eof_reached)
279 return;
ee9f36a8 280
465e1dad 281 if(s->update_checksum){
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282 if(s->buf_end > s->checksum_ptr)
283 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr);
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284 s->checksum_ptr= s->buffer;
285 }
286
602dd8f6 287 if(s->read_packet)
2d89f334 288 len = s->read_packet(s->opaque, s->buffer, s->buffer_size);
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289 if (len <= 0) {
290 /* do not modify buffer if EOF reached so that a seek back can
291 be done without rereading data */
de6d9b64 292 s->eof_reached = 1;
5f097703
AB
293 if(len<0)
294 s->error= len;
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295 } else {
296 s->pos += len;
297 s->buf_ptr = s->buffer;
298 s->buf_end = s->buffer + len;
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299 }
300}
301
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302unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf, unsigned int len){
303 return av_crc(av_crc04C11DB7, checksum, buf, len);
304}
305
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306unsigned long get_checksum(ByteIOContext *s){
307 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
465e1dad 308 s->update_checksum= NULL;
ee9f36a8
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309 return s->checksum;
310}
311
312void init_checksum(ByteIOContext *s, unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len), unsigned long checksum){
313 s->update_checksum= update_checksum;
465e1dad 314 if(s->update_checksum){
ccb15994 315 s->checksum= checksum;
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316 s->checksum_ptr= s->buf_ptr;
317 }
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318}
319
abba3dd1 320/* XXX: put an inline version */
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321int get_byte(ByteIOContext *s)
322{
323 if (s->buf_ptr < s->buf_end) {
324 return *s->buf_ptr++;
325 } else {
326 fill_buffer(s);
327 if (s->buf_ptr < s->buf_end)
328 return *s->buf_ptr++;
329 else
330 return 0;
331 }
332}
333
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334int url_fgetc(ByteIOContext *s)
335{
336 if (s->buf_ptr < s->buf_end) {
337 return *s->buf_ptr++;
338 } else {
339 fill_buffer(s);
340 if (s->buf_ptr < s->buf_end)
341 return *s->buf_ptr++;
342 else
343 return URL_EOF;
344 }
345}
346
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347int get_buffer(ByteIOContext *s, unsigned char *buf, int size)
348{
349 int len, size1;
350
351 size1 = size;
352 while (size > 0) {
353 len = s->buf_end - s->buf_ptr;
354 if (len > size)
355 len = size;
356 if (len == 0) {
3e2b6358 357 if(size > s->buffer_size && !s->update_checksum){
602dd8f6 358 if(s->read_packet)
2d89f334 359 len = s->read_packet(s->opaque, buf, size);
3e2b6358
MN
360 if (len <= 0) {
361 /* do not modify buffer if EOF reached so that a seek back can
362 be done without rereading data */
363 s->eof_reached = 1;
364 if(len<0)
365 s->error= len;
366 break;
367 } else {
368 s->pos += len;
369 size -= len;
370 buf += len;
371 s->buf_ptr = s->buffer;
372 s->buf_end = s->buffer/* + len*/;
373 }
374 }else{
375 fill_buffer(s);
376 len = s->buf_end - s->buf_ptr;
377 if (len == 0)
378 break;
379 }
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380 } else {
381 memcpy(buf, s->buf_ptr, len);
382 buf += len;
383 s->buf_ptr += len;
384 size -= len;
385 }
386 }
387 return size1 - size;
388}
389
e15dec10
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390int get_partial_buffer(ByteIOContext *s, unsigned char *buf, int size)
391{
392 int len;
115329f1 393
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394 if(size<0)
395 return -1;
e15dec10
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396
397 len = s->buf_end - s->buf_ptr;
398 if (len == 0) {
399 fill_buffer(s);
400 len = s->buf_end - s->buf_ptr;
401 }
402 if (len > size)
403 len = size;
404 memcpy(buf, s->buf_ptr, len);
405 s->buf_ptr += len;
406 return len;
407}
408
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409unsigned int get_le16(ByteIOContext *s)
410{
411 unsigned int val;
412 val = get_byte(s);
413 val |= get_byte(s) << 8;
414 return val;
415}
416
ea395e8c
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417unsigned int get_le24(ByteIOContext *s)
418{
419 unsigned int val;
420 val = get_le16(s);
421 val |= get_byte(s) << 16;
422 return val;
423}
424
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425unsigned int get_le32(ByteIOContext *s)
426{
427 unsigned int val;
a254c574
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428 val = get_le16(s);
429 val |= get_le16(s) << 16;
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430 return val;
431}
432
0c1a9eda 433uint64_t get_le64(ByteIOContext *s)
de6d9b64 434{
0c1a9eda
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435 uint64_t val;
436 val = (uint64_t)get_le32(s);
437 val |= (uint64_t)get_le32(s) << 32;
de6d9b64
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438 return val;
439}
440
441unsigned int get_be16(ByteIOContext *s)
442{
443 unsigned int val;
444 val = get_byte(s) << 8;
445 val |= get_byte(s);
446 return val;
447}
448
a254c574 449unsigned int get_be24(ByteIOContext *s)
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450{
451 unsigned int val;
a254c574 452 val = get_be16(s) << 8;
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453 val |= get_byte(s);
454 return val;
455}
a254c574
MN
456unsigned int get_be32(ByteIOContext *s)
457{
458 unsigned int val;
459 val = get_be16(s) << 16;
460 val |= get_be16(s);
461 return val;
462}
de6d9b64 463
3b4b29dc 464char *get_strz(ByteIOContext *s, char *buf, int maxlen)
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PG
465{
466 int i = 0;
467 char c;
468
469 while ((c = get_byte(s))) {
470 if (i < maxlen-1)
471 buf[i++] = c;
472 }
115329f1 473
75bdb984
PG
474 buf[i] = 0; /* Ensure null terminated, but may be truncated */
475
476 return buf;
477}
478
0c1a9eda 479uint64_t get_be64(ByteIOContext *s)
de6d9b64 480{
0c1a9eda
ZK
481 uint64_t val;
482 val = (uint64_t)get_be32(s) << 32;
483 val |= (uint64_t)get_be32(s);
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484 return val;
485}
486
7798b42d 487uint64_t ff_get_v(ByteIOContext *bc){
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488 uint64_t val = 0;
489 int tmp;
490
491 do{
492 tmp = get_byte(bc);
493 val= (val<<7) + (tmp&127);
494 }while(tmp&128);
495 return val;
496}
497
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498/* link with avio functions */
499
a9e35095 500#ifdef CONFIG_MUXERS
576ae256 501static int url_write_packet(void *opaque, uint8_t *buf, int buf_size)
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502{
503 URLContext *h = opaque;
576ae256 504 return url_write(h, buf, buf_size);
de6d9b64 505}
764ef400 506#else
bb270c08 507#define url_write_packet NULL
a9e35095 508#endif //CONFIG_MUXERS
de6d9b64 509
0c1a9eda 510static int url_read_packet(void *opaque, uint8_t *buf, int buf_size)
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511{
512 URLContext *h = opaque;
513 return url_read(h, buf, buf_size);
514}
515
536ffa59 516static offset_t url_seek_packet(void *opaque, offset_t offset, int whence)
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517{
518 URLContext *h = opaque;
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519 return url_seek(h, offset, whence);
520 //return 0;
de6d9b64
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521}
522
899681cd 523int url_fdopen(ByteIOContext **s, URLContext *h)
de6d9b64 524{
0c1a9eda 525 uint8_t *buffer;
abba3dd1 526 int buffer_size, max_packet_size;
de6d9b64 527
115329f1 528
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529 max_packet_size = url_get_max_packet_size(h);
530 if (max_packet_size) {
531 buffer_size = max_packet_size; /* no need to bufferize more than one packet */
532 } else {
533 buffer_size = IO_BUFFER_SIZE;
534 }
1ea4f593 535 buffer = av_malloc(buffer_size);
de6d9b64 536 if (!buffer)
8fa36ae0 537 return AVERROR(ENOMEM);
de6d9b64 538
899681cd
BA
539 *s = av_mallocz(sizeof(ByteIOContext));
540 if(!*s) {
541 av_free(buffer);
542 return AVERROR(ENOMEM);
543 }
544
545 if (init_put_byte(*s, buffer, buffer_size,
ac9fe33d 546 (h->flags & URL_WRONLY || h->flags & URL_RDWR), h,
de6d9b64 547 url_read_packet, url_write_packet, url_seek_packet) < 0) {
1ea4f593 548 av_free(buffer);
899681cd 549 av_freep(s);
6f3e0b21 550 return AVERROR(EIO);
de6d9b64 551 }
899681cd
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552 (*s)->is_streamed = h->is_streamed;
553 (*s)->max_packet_size = max_packet_size;
de6d9b64
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554 return 0;
555}
556
de6d9b64
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557int url_setbufsize(ByteIOContext *s, int buf_size)
558{
0c1a9eda 559 uint8_t *buffer;
1ea4f593 560 buffer = av_malloc(buf_size);
de6d9b64 561 if (!buffer)
8fa36ae0 562 return AVERROR(ENOMEM);
de6d9b64 563
1ea4f593 564 av_free(s->buffer);
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565 s->buffer = buffer;
566 s->buffer_size = buf_size;
567 s->buf_ptr = buffer;
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BA
568 url_resetbuf(s, s->write_flag ? URL_WRONLY : URL_RDONLY);
569 return 0;
570}
571
572int url_resetbuf(ByteIOContext *s, int flags)
573{
574 URLContext *h = s->opaque;
575 if ((flags & URL_RDWR) || (h && h->flags != flags && !h->flags & URL_RDWR))
576 return AVERROR(EINVAL);
577
578 if (flags & URL_WRONLY) {
579 s->buf_end = s->buffer + s->buffer_size;
580 s->write_flag = 1;
581 } else {
582 s->buf_end = s->buffer;
583 s->write_flag = 0;
584 }
de6d9b64
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585 return 0;
586}
587
899681cd 588int url_fopen(ByteIOContext **s, const char *filename, int flags)
de6d9b64
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589{
590 URLContext *h;
591 int err;
592
593 err = url_open(&h, filename, flags);
594 if (err < 0)
595 return err;
596 err = url_fdopen(s, h);
597 if (err < 0) {
598 url_close(h);
599 return err;
600 }
601 return 0;
602}
603
604int url_fclose(ByteIOContext *s)
605{
606 URLContext *h = s->opaque;
115329f1 607
1ea4f593 608 av_free(s->buffer);
899681cd 609 av_free(s);
de6d9b64
FB
610 return url_close(h);
611}
612
613URLContext *url_fileno(ByteIOContext *s)
614{
615 return s->opaque;
616}
617
a9e35095 618#ifdef CONFIG_MUXERS
abba3dd1
FB
619int url_fprintf(ByteIOContext *s, const char *fmt, ...)
620{
621 va_list ap;
622 char buf[4096];
623 int ret;
624
625 va_start(ap, fmt);
626 ret = vsnprintf(buf, sizeof(buf), fmt, ap);
627 va_end(ap);
628 put_buffer(s, buf, strlen(buf));
629 return ret;
630}
a9e35095 631#endif //CONFIG_MUXERS
abba3dd1 632
abba3dd1
FB
633char *url_fgets(ByteIOContext *s, char *buf, int buf_size)
634{
635 int c;
636 char *q;
637
638 c = url_fgetc(s);
639 if (c == EOF)
640 return NULL;
641 q = buf;
642 for(;;) {
643 if (c == EOF || c == '\n')
644 break;
645 if ((q - buf) < buf_size - 1)
646 *q++ = c;
647 c = url_fgetc(s);
648 }
649 if (buf_size > 0)
650 *q = '\0';
651 return buf;
652}
653
abba3dd1
FB
654int url_fget_max_packet_size(ByteIOContext *s)
655{
656 return s->max_packet_size;
657}
658
8fa641f8
LLL
659/* url_open_dyn_buf and url_close_dyn_buf are used in rtp.c to send a response
660 * back to the server even if CONFIG_MUXERS is not set. */
661#if defined(CONFIG_MUXERS) || defined(CONFIG_NETWORK)
de6d9b64 662/* buffer handling */
899681cd 663int url_open_buf(ByteIOContext **s, uint8_t *buf, int buf_size, int flags)
de6d9b64 664{
899681cd
BA
665 int ret;
666 *s = av_mallocz(sizeof(ByteIOContext));
667 if(!*s)
668 return AVERROR(ENOMEM);
669 ret = init_put_byte(*s, buf, buf_size,
670 (flags & URL_WRONLY || flags & URL_RDWR),
671 NULL, NULL, NULL, NULL);
672 if(ret != 0)
673 av_freep(s);
674 return ret;
de6d9b64
FB
675}
676
de6d9b64
FB
677int url_close_buf(ByteIOContext *s)
678{
abba3dd1 679 put_flush_packet(s);
de6d9b64
FB
680 return s->buf_ptr - s->buffer;
681}
abba3dd1
FB
682
683/* output in a dynamic buffer */
684
685typedef struct DynBuffer {
686 int pos, size, allocated_size;
0c1a9eda 687 uint8_t *buffer;
abba3dd1 688 int io_buffer_size;
0c1a9eda 689 uint8_t io_buffer[1];
abba3dd1
FB
690} DynBuffer;
691
576ae256 692static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
abba3dd1
FB
693{
694 DynBuffer *d = opaque;
695 int new_size, new_allocated_size;
115329f1 696
abba3dd1
FB
697 /* reallocate buffer if needed */
698 new_size = d->pos + buf_size;
699 new_allocated_size = d->allocated_size;
568e18b1
MN
700 if(new_size < d->pos || new_size > INT_MAX/2)
701 return -1;
abba3dd1
FB
702 while (new_size > new_allocated_size) {
703 if (!new_allocated_size)
704 new_allocated_size = new_size;
705 else
115329f1 706 new_allocated_size += new_allocated_size / 2 + 1;
abba3dd1 707 }
115329f1 708
abba3dd1 709 if (new_allocated_size > d->allocated_size) {
b88ba823
MH
710 d->buffer = av_realloc(d->buffer, new_allocated_size);
711 if(d->buffer == NULL)
576ae256 712 return -1234;
abba3dd1
FB
713 d->allocated_size = new_allocated_size;
714 }
715 memcpy(d->buffer + d->pos, buf, buf_size);
716 d->pos = new_size;
717 if (d->pos > d->size)
718 d->size = d->pos;
576ae256 719 return buf_size;
abba3dd1
FB
720}
721
576ae256 722static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
abba3dd1
FB
723{
724 unsigned char buf1[4];
576ae256 725 int ret;
abba3dd1
FB
726
727 /* packetized write: output the header */
728 buf1[0] = (buf_size >> 24);
729 buf1[1] = (buf_size >> 16);
730 buf1[2] = (buf_size >> 8);
731 buf1[3] = (buf_size);
576ae256
MN
732 ret= dyn_buf_write(opaque, buf1, 4);
733 if(ret < 0)
734 return ret;
abba3dd1
FB
735
736 /* then the data */
576ae256 737 return dyn_buf_write(opaque, buf, buf_size);
abba3dd1
FB
738}
739
536ffa59 740static offset_t dyn_buf_seek(void *opaque, offset_t offset, int whence)
abba3dd1
FB
741{
742 DynBuffer *d = opaque;
743
744 if (whence == SEEK_CUR)
745 offset += d->pos;
746 else if (whence == SEEK_END)
747 offset += d->size;
748 if (offset < 0 || offset > 0x7fffffffLL)
749 return -1;
750 d->pos = offset;
751 return 0;
752}
753
899681cd 754static int url_open_dyn_buf_internal(ByteIOContext **s, int max_packet_size)
abba3dd1
FB
755{
756 DynBuffer *d;
757 int io_buffer_size, ret;
115329f1
DB
758
759 if (max_packet_size)
abba3dd1
FB
760 io_buffer_size = max_packet_size;
761 else
762 io_buffer_size = 1024;
115329f1 763
568e18b1
MN
764 if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
765 return -1;
abba3dd1
FB
766 d = av_malloc(sizeof(DynBuffer) + io_buffer_size);
767 if (!d)
768 return -1;
899681cd
BA
769 *s = av_mallocz(sizeof(ByteIOContext));
770 if(!*s) {
771 av_free(d);
772 return AVERROR(ENOMEM);
773 }
abba3dd1
FB
774 d->io_buffer_size = io_buffer_size;
775 d->buffer = NULL;
776 d->pos = 0;
777 d->size = 0;
778 d->allocated_size = 0;
899681cd 779 ret = init_put_byte(*s, d->io_buffer, io_buffer_size,
115329f1
DB
780 1, d, NULL,
781 max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
abba3dd1
FB
782 max_packet_size ? NULL : dyn_buf_seek);
783 if (ret == 0) {
899681cd
BA
784 (*s)->max_packet_size = max_packet_size;
785 } else {
786 av_free(d);
787 av_freep(s);
abba3dd1
FB
788 }
789 return ret;
790}
791
899681cd 792int url_open_dyn_buf(ByteIOContext **s)
abba3dd1
FB
793{
794 return url_open_dyn_buf_internal(s, 0);
795}
796
899681cd 797int url_open_dyn_packet_buf(ByteIOContext **s, int max_packet_size)
abba3dd1
FB
798{
799 if (max_packet_size <= 0)
800 return -1;
801 return url_open_dyn_buf_internal(s, max_packet_size);
802}
803
0c1a9eda 804int url_close_dyn_buf(ByteIOContext *s, uint8_t **pbuffer)
abba3dd1
FB
805{
806 DynBuffer *d = s->opaque;
807 int size;
808
809 put_flush_packet(s);
810
811 *pbuffer = d->buffer;
812 size = d->size;
813 av_free(d);
899681cd 814 av_free(s);
abba3dd1
FB
815 return size;
816}
8fa641f8 817#endif /* CONFIG_MUXERS || CONFIG_NETWORK */