Make url_fseek() return AVERROR_EOF rather than AVERROR(EPIPE) if end
[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 *
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5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
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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 */
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21
22#include "libavutil/crc.h"
aa805f94 23#include "libavutil/intreadwrite.h"
de6d9b64 24#include "avformat.h"
5c91a675 25#include "avio.h"
abba3dd1 26#include <stdarg.h>
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27
28#define IO_BUFFER_SIZE 32768
29
398f5d3f 30static void fill_buffer(ByteIOContext *s);
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31#if LIBAVFORMAT_VERSION_MAJOR >= 53
32static int url_resetbuf(ByteIOContext *s, int flags);
33#endif
398f5d3f 34
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35int init_put_byte(ByteIOContext *s,
36 unsigned char *buffer,
37 int buffer_size,
38 int write_flag,
39 void *opaque,
0c1a9eda 40 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
576ae256 41 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
bc5c918e 42 int64_t (*seek)(void *opaque, int64_t offset, int whence))
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43{
44 s->buffer = buffer;
45 s->buffer_size = buffer_size;
46 s->buf_ptr = buffer;
de6d9b64 47 s->opaque = opaque;
9daa4cea 48 url_resetbuf(s, write_flag ? URL_WRONLY : URL_RDONLY);
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49 s->write_packet = write_packet;
50 s->read_packet = read_packet;
51 s->seek = seek;
52 s->pos = 0;
53 s->must_flush = 0;
54 s->eof_reached = 0;
576ae256 55 s->error = 0;
de6d9b64 56 s->is_streamed = 0;
abba3dd1 57 s->max_packet_size = 0;
ee9f36a8 58 s->update_checksum= NULL;
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59 if(!read_packet && !write_flag){
60 s->pos = buffer_size;
61 s->buf_end = s->buffer + buffer_size;
62 }
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63 s->read_pause = NULL;
64 s->read_seek = NULL;
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65 return 0;
66}
115329f1 67
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68ByteIOContext *av_alloc_put_byte(
69 unsigned char *buffer,
70 int buffer_size,
71 int write_flag,
72 void *opaque,
73 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
74 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
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75 int64_t (*seek)(void *opaque, int64_t offset, int whence))
76{
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77 ByteIOContext *s = av_mallocz(sizeof(ByteIOContext));
78 init_put_byte(s, buffer, buffer_size, write_flag, opaque,
79 read_packet, write_packet, seek);
80 return s;
81}
82
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83static void flush_buffer(ByteIOContext *s)
84{
85 if (s->buf_ptr > s->buffer) {
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86 if (s->write_packet && !s->error){
87 int ret= s->write_packet(s->opaque, s->buffer, s->buf_ptr - s->buffer);
88 if(ret < 0){
89 s->error = ret;
90 }
91 }
465e1dad 92 if(s->update_checksum){
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93 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
94 s->checksum_ptr= s->buffer;
95 }
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96 s->pos += s->buf_ptr - s->buffer;
97 }
98 s->buf_ptr = s->buffer;
99}
100
101void put_byte(ByteIOContext *s, int b)
102{
103 *(s->buf_ptr)++ = b;
115329f1 104 if (s->buf_ptr >= s->buf_end)
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105 flush_buffer(s);
106}
107
75bdb984 108void put_buffer(ByteIOContext *s, const unsigned char *buf, int size)
de6d9b64 109{
de6d9b64 110 while (size > 0) {
90aa6ace 111 int len = FFMIN(s->buf_end - s->buf_ptr, size);
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112 memcpy(s->buf_ptr, buf, len);
113 s->buf_ptr += len;
114
115329f1 115 if (s->buf_ptr >= s->buf_end)
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116 flush_buffer(s);
117
118 buf += len;
119 size -= len;
120 }
121}
122
123void put_flush_packet(ByteIOContext *s)
124{
125 flush_buffer(s);
126 s->must_flush = 0;
127}
128
bc5c918e 129int64_t url_fseek(ByteIOContext *s, int64_t offset, int whence)
de6d9b64 130{
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131 int64_t offset1;
132 int64_t pos;
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133
134 if(!s)
135 return AVERROR(EINVAL);
136
137 pos = s->pos - (s->write_flag ? 0 : (s->buf_end - s->buffer));
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138
139 if (whence != SEEK_CUR && whence != SEEK_SET)
8fa36ae0 140 return AVERROR(EINVAL);
115329f1 141
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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 &&
b3eab9fb 150 offset1 >= 0 && offset1 <= (s->buf_end - s->buffer)) {
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151 /* can do the seek inside the buffer */
152 s->buf_ptr = s->buffer + offset1;
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153 } else if(s->is_streamed && !s->write_flag && offset1 >= 0 &&
154 ( offset1 < (s->buf_end - s->buffer) + (1<<16)
155 || (whence & AVSEEK_FORCE))){
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156 while(s->pos < offset && !s->eof_reached)
157 fill_buffer(s);
5cb4b82a 158 if (s->eof_reached)
8d5e638f 159 return AVERROR_EOF;
398f5d3f 160 s->buf_ptr = s->buf_end + offset - s->pos;
f40d1739 161 } else {
bc5c918e 162 int64_t res = AVERROR(EPIPE);
68fcdbf1 163
b250f9c6 164#if CONFIG_MUXERS || CONFIG_NETWORK
f40d1739 165 if (s->write_flag) {
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166 flush_buffer(s);
167 s->must_flush = 1;
de6d9b64 168 }
b250f9c6 169#endif /* CONFIG_MUXERS || CONFIG_NETWORK */
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170 if (!s->seek || (res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
171 return res;
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BC
172 if (!s->write_flag)
173 s->buf_end = s->buffer;
174 s->buf_ptr = s->buffer;
f40d1739 175 s->pos = offset;
de6d9b64 176 }
f40d1739 177 s->eof_reached = 0;
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178 return offset;
179}
180
bc5c918e 181void url_fskip(ByteIOContext *s, int64_t offset)
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182{
183 url_fseek(s, offset, SEEK_CUR);
184}
185
bc5c918e 186int64_t url_ftell(ByteIOContext *s)
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187{
188 return url_fseek(s, 0, SEEK_CUR);
189}
190
bc5c918e 191int64_t url_fsize(ByteIOContext *s)
a965c478 192{
bc5c918e 193 int64_t size;
115329f1 194
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195 if(!s)
196 return AVERROR(EINVAL);
197
a965c478 198 if (!s->seek)
8fa36ae0 199 return AVERROR(EPIPE);
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200 size = s->seek(s->opaque, 0, AVSEEK_SIZE);
201 if(size<0){
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202 if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
203 return size;
204 size++;
1ae2c5f2 205 s->seek(s->opaque, s->pos, SEEK_SET);
8e287af0 206 }
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207 return size;
208}
209
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210int url_feof(ByteIOContext *s)
211{
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212 if(!s)
213 return 0;
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214 return s->eof_reached;
215}
216
576ae256
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217int url_ferror(ByteIOContext *s)
218{
899681cd
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219 if(!s)
220 return 0;
576ae256
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221 return s->error;
222}
223
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224void put_le32(ByteIOContext *s, unsigned int val)
225{
226 put_byte(s, val);
227 put_byte(s, val >> 8);
228 put_byte(s, val >> 16);
229 put_byte(s, val >> 24);
230}
231
232void put_be32(ByteIOContext *s, unsigned int val)
233{
234 put_byte(s, val >> 24);
235 put_byte(s, val >> 16);
236 put_byte(s, val >> 8);
237 put_byte(s, val);
238}
239
3b4b29dc 240void put_strz(ByteIOContext *s, const char *str)
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241{
242 if (str)
243 put_buffer(s, (const unsigned char *) str, strlen(str) + 1);
244 else
245 put_byte(s, 0);
246}
247
0c1a9eda 248void put_le64(ByteIOContext *s, uint64_t val)
de6d9b64 249{
0c1a9eda
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250 put_le32(s, (uint32_t)(val & 0xffffffff));
251 put_le32(s, (uint32_t)(val >> 32));
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252}
253
0c1a9eda 254void put_be64(ByteIOContext *s, uint64_t val)
de6d9b64 255{
0c1a9eda
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256 put_be32(s, (uint32_t)(val >> 32));
257 put_be32(s, (uint32_t)(val & 0xffffffff));
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258}
259
260void put_le16(ByteIOContext *s, unsigned int val)
261{
262 put_byte(s, val);
263 put_byte(s, val >> 8);
264}
265
266void put_be16(ByteIOContext *s, unsigned int val)
267{
268 put_byte(s, val >> 8);
269 put_byte(s, val);
270}
271
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272void put_le24(ByteIOContext *s, unsigned int val)
273{
274 put_le16(s, val & 0xffff);
275 put_byte(s, val >> 16);
276}
277
a254c574
MN
278void put_be24(ByteIOContext *s, unsigned int val)
279{
280 put_be16(s, val >> 8);
281 put_byte(s, val);
282}
283
0570bf06 284void put_tag(ByteIOContext *s, const char *tag)
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285{
286 while (*tag) {
287 put_byte(s, *tag++);
288 }
289}
290
291/* Input stream */
292
293static void fill_buffer(ByteIOContext *s)
294{
f5edd874 295 uint8_t *dst= !s->max_packet_size && s->buf_end - s->buffer < s->buffer_size ? s->buf_ptr : s->buffer;
4589dc5c
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296 int len= s->buffer_size - (dst - s->buffer);
297
298 assert(s->buf_ptr == s->buf_end);
de6d9b64 299
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300 /* no need to do anything if EOF already reached */
301 if (s->eof_reached)
302 return;
ee9f36a8 303
4589dc5c 304 if(s->update_checksum && dst == s->buffer){
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MN
305 if(s->buf_end > s->checksum_ptr)
306 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr);
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307 s->checksum_ptr= s->buffer;
308 }
309
602dd8f6 310 if(s->read_packet)
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311 len = s->read_packet(s->opaque, dst, len);
312 else
313 len = 0;
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314 if (len <= 0) {
315 /* do not modify buffer if EOF reached so that a seek back can
316 be done without rereading data */
de6d9b64 317 s->eof_reached = 1;
5f097703
AB
318 if(len<0)
319 s->error= len;
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320 } else {
321 s->pos += len;
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322 s->buf_ptr = dst;
323 s->buf_end = dst + len;
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324 }
325}
326
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DB
327unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
328 unsigned int len)
329{
3abe5fbd 330 return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
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331}
332
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DB
333unsigned long get_checksum(ByteIOContext *s)
334{
ee9f36a8 335 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
465e1dad 336 s->update_checksum= NULL;
ee9f36a8
MN
337 return s->checksum;
338}
339
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DB
340void init_checksum(ByteIOContext *s,
341 unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
342 unsigned long checksum)
343{
ee9f36a8 344 s->update_checksum= update_checksum;
465e1dad 345 if(s->update_checksum){
ccb15994 346 s->checksum= checksum;
465e1dad
MN
347 s->checksum_ptr= s->buf_ptr;
348 }
ee9f36a8
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349}
350
abba3dd1 351/* XXX: put an inline version */
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352int get_byte(ByteIOContext *s)
353{
354 if (s->buf_ptr < s->buf_end) {
355 return *s->buf_ptr++;
356 } else {
357 fill_buffer(s);
358 if (s->buf_ptr < s->buf_end)
359 return *s->buf_ptr++;
360 else
361 return 0;
362 }
363}
364
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365int url_fgetc(ByteIOContext *s)
366{
367 if (s->buf_ptr < s->buf_end) {
368 return *s->buf_ptr++;
369 } else {
370 fill_buffer(s);
371 if (s->buf_ptr < s->buf_end)
372 return *s->buf_ptr++;
373 else
374 return URL_EOF;
375 }
376}
377
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378int get_buffer(ByteIOContext *s, unsigned char *buf, int size)
379{
380 int len, size1;
381
382 size1 = size;
383 while (size > 0) {
384 len = s->buf_end - s->buf_ptr;
385 if (len > size)
386 len = size;
387 if (len == 0) {
3e2b6358 388 if(size > s->buffer_size && !s->update_checksum){
602dd8f6 389 if(s->read_packet)
2d89f334 390 len = s->read_packet(s->opaque, buf, size);
3e2b6358
MN
391 if (len <= 0) {
392 /* do not modify buffer if EOF reached so that a seek back can
393 be done without rereading data */
394 s->eof_reached = 1;
395 if(len<0)
396 s->error= len;
397 break;
398 } else {
399 s->pos += len;
400 size -= len;
401 buf += len;
402 s->buf_ptr = s->buffer;
403 s->buf_end = s->buffer/* + len*/;
404 }
405 }else{
406 fill_buffer(s);
407 len = s->buf_end - s->buf_ptr;
408 if (len == 0)
409 break;
410 }
de6d9b64
FB
411 } else {
412 memcpy(buf, s->buf_ptr, len);
413 buf += len;
414 s->buf_ptr += len;
415 size -= len;
416 }
417 }
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RD
418 if (size1 == size) {
419 if (url_ferror(s)) return url_ferror(s);
420 if (url_feof(s)) return AVERROR_EOF;
421 }
de6d9b64
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422 return size1 - size;
423}
424
e15dec10
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425int get_partial_buffer(ByteIOContext *s, unsigned char *buf, int size)
426{
427 int len;
115329f1 428
0ecca7a4
MN
429 if(size<0)
430 return -1;
e15dec10
LS
431
432 len = s->buf_end - s->buf_ptr;
433 if (len == 0) {
434 fill_buffer(s);
435 len = s->buf_end - s->buf_ptr;
436 }
437 if (len > size)
438 len = size;
439 memcpy(buf, s->buf_ptr, len);
440 s->buf_ptr += len;
7f7686df
RD
441 if (!len) {
442 if (url_ferror(s)) return url_ferror(s);
443 if (url_feof(s)) return AVERROR_EOF;
444 }
e15dec10
LS
445 return len;
446}
447
de6d9b64
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448unsigned int get_le16(ByteIOContext *s)
449{
450 unsigned int val;
451 val = get_byte(s);
452 val |= get_byte(s) << 8;
453 return val;
454}
455
ea395e8c
AJ
456unsigned int get_le24(ByteIOContext *s)
457{
458 unsigned int val;
459 val = get_le16(s);
460 val |= get_byte(s) << 16;
461 return val;
462}
463
de6d9b64
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464unsigned int get_le32(ByteIOContext *s)
465{
466 unsigned int val;
a254c574
MN
467 val = get_le16(s);
468 val |= get_le16(s) << 16;
de6d9b64
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469 return val;
470}
471
0c1a9eda 472uint64_t get_le64(ByteIOContext *s)
de6d9b64 473{
0c1a9eda
ZK
474 uint64_t val;
475 val = (uint64_t)get_le32(s);
476 val |= (uint64_t)get_le32(s) << 32;
de6d9b64
FB
477 return val;
478}
479
480unsigned int get_be16(ByteIOContext *s)
481{
482 unsigned int val;
483 val = get_byte(s) << 8;
484 val |= get_byte(s);
485 return val;
486}
487
a254c574 488unsigned int get_be24(ByteIOContext *s)
de6d9b64
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489{
490 unsigned int val;
a254c574 491 val = get_be16(s) << 8;
de6d9b64
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492 val |= get_byte(s);
493 return val;
494}
a254c574
MN
495unsigned int get_be32(ByteIOContext *s)
496{
497 unsigned int val;
498 val = get_be16(s) << 16;
499 val |= get_be16(s);
500 return val;
501}
de6d9b64 502
3b4b29dc 503char *get_strz(ByteIOContext *s, char *buf, int maxlen)
75bdb984
PG
504{
505 int i = 0;
506 char c;
507
508 while ((c = get_byte(s))) {
509 if (i < maxlen-1)
510 buf[i++] = c;
511 }
115329f1 512
75bdb984
PG
513 buf[i] = 0; /* Ensure null terminated, but may be truncated */
514
515 return buf;
516}
517
0c1a9eda 518uint64_t get_be64(ByteIOContext *s)
de6d9b64 519{
0c1a9eda
ZK
520 uint64_t val;
521 val = (uint64_t)get_be32(s) << 32;
522 val |= (uint64_t)get_be32(s);
de6d9b64
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523 return val;
524}
525
7798b42d 526uint64_t ff_get_v(ByteIOContext *bc){
897d3eef
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527 uint64_t val = 0;
528 int tmp;
529
530 do{
531 tmp = get_byte(bc);
532 val= (val<<7) + (tmp&127);
533 }while(tmp&128);
534 return val;
535}
536
899681cd 537int url_fdopen(ByteIOContext **s, URLContext *h)
de6d9b64 538{
0c1a9eda 539 uint8_t *buffer;
abba3dd1 540 int buffer_size, max_packet_size;
de6d9b64 541
abba3dd1
FB
542 max_packet_size = url_get_max_packet_size(h);
543 if (max_packet_size) {
544 buffer_size = max_packet_size; /* no need to bufferize more than one packet */
545 } else {
546 buffer_size = IO_BUFFER_SIZE;
547 }
1ea4f593 548 buffer = av_malloc(buffer_size);
de6d9b64 549 if (!buffer)
8fa36ae0 550 return AVERROR(ENOMEM);
de6d9b64 551
899681cd
BA
552 *s = av_mallocz(sizeof(ByteIOContext));
553 if(!*s) {
554 av_free(buffer);
555 return AVERROR(ENOMEM);
556 }
557
558 if (init_put_byte(*s, buffer, buffer_size,
ac9fe33d 559 (h->flags & URL_WRONLY || h->flags & URL_RDWR), h,
004050ee 560 url_read, url_write, url_seek) < 0) {
1ea4f593 561 av_free(buffer);
899681cd 562 av_freep(s);
6f3e0b21 563 return AVERROR(EIO);
de6d9b64 564 }
899681cd
BA
565 (*s)->is_streamed = h->is_streamed;
566 (*s)->max_packet_size = max_packet_size;
e7e4810a 567 if(h->prot) {
502bdf68 568 (*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause;
bc5c918e 569 (*s)->read_seek = (int64_t (*)(void *, int, int64_t, int))h->prot->url_read_seek;
e7e4810a 570 }
de6d9b64
FB
571 return 0;
572}
573
de6d9b64
FB
574int url_setbufsize(ByteIOContext *s, int buf_size)
575{
0c1a9eda 576 uint8_t *buffer;
1ea4f593 577 buffer = av_malloc(buf_size);
de6d9b64 578 if (!buffer)
8fa36ae0 579 return AVERROR(ENOMEM);
de6d9b64 580
1ea4f593 581 av_free(s->buffer);
de6d9b64
FB
582 s->buffer = buffer;
583 s->buffer_size = buf_size;
584 s->buf_ptr = buffer;
770d9daf
BA
585 url_resetbuf(s, s->write_flag ? URL_WRONLY : URL_RDONLY);
586 return 0;
587}
588
08580cb0 589#if LIBAVFORMAT_VERSION_MAJOR < 53
770d9daf 590int url_resetbuf(ByteIOContext *s, int flags)
08580cb0
BF
591#else
592static int url_resetbuf(ByteIOContext *s, int flags)
593#endif
770d9daf 594{
08580cb0 595#if LIBAVFORMAT_VERSION_MAJOR < 53
770d9daf
BA
596 URLContext *h = s->opaque;
597 if ((flags & URL_RDWR) || (h && h->flags != flags && !h->flags & URL_RDWR))
598 return AVERROR(EINVAL);
08580cb0
BF
599#else
600 assert(flags == URL_WRONLY || flags == URL_RDONLY);
601#endif
770d9daf
BA
602
603 if (flags & URL_WRONLY) {
604 s->buf_end = s->buffer + s->buffer_size;
605 s->write_flag = 1;
606 } else {
607 s->buf_end = s->buffer;
608 s->write_flag = 0;
609 }
de6d9b64
FB
610 return 0;
611}
612
899681cd 613int url_fopen(ByteIOContext **s, const char *filename, int flags)
de6d9b64
FB
614{
615 URLContext *h;
616 int err;
617
618 err = url_open(&h, filename, flags);
619 if (err < 0)
620 return err;
621 err = url_fdopen(s, h);
622 if (err < 0) {
623 url_close(h);
624 return err;
625 }
626 return 0;
627}
628
629int url_fclose(ByteIOContext *s)
630{
631 URLContext *h = s->opaque;
115329f1 632
1ea4f593 633 av_free(s->buffer);
899681cd 634 av_free(s);
de6d9b64
FB
635 return url_close(h);
636}
637
638URLContext *url_fileno(ByteIOContext *s)
639{
640 return s->opaque;
641}
642
b250f9c6 643#if CONFIG_MUXERS
abba3dd1
FB
644int url_fprintf(ByteIOContext *s, const char *fmt, ...)
645{
646 va_list ap;
647 char buf[4096];
648 int ret;
649
650 va_start(ap, fmt);
651 ret = vsnprintf(buf, sizeof(buf), fmt, ap);
652 va_end(ap);
653 put_buffer(s, buf, strlen(buf));
654 return ret;
655}
a9e35095 656#endif //CONFIG_MUXERS
abba3dd1 657
abba3dd1
FB
658char *url_fgets(ByteIOContext *s, char *buf, int buf_size)
659{
660 int c;
661 char *q;
662
663 c = url_fgetc(s);
664 if (c == EOF)
665 return NULL;
666 q = buf;
667 for(;;) {
668 if (c == EOF || c == '\n')
669 break;
670 if ((q - buf) < buf_size - 1)
671 *q++ = c;
672 c = url_fgetc(s);
673 }
674 if (buf_size > 0)
675 *q = '\0';
676 return buf;
677}
678
abba3dd1
FB
679int url_fget_max_packet_size(ByteIOContext *s)
680{
681 return s->max_packet_size;
682}
683
502bdf68 684int av_url_read_fpause(ByteIOContext *s, int pause)
e7e4810a
BA
685{
686 if (!s->read_pause)
687 return AVERROR(ENOSYS);
502bdf68 688 return s->read_pause(s->opaque, pause);
e7e4810a
BA
689}
690
7f37f568
DB
691int64_t av_url_read_fseek(ByteIOContext *s, int stream_index,
692 int64_t timestamp, int flags)
e7e4810a
BA
693{
694 URLContext *h = s->opaque;
bc5c918e 695 int64_t ret;
e7e4810a
BA
696 if (!s->read_seek)
697 return AVERROR(ENOSYS);
698 ret = s->read_seek(h, stream_index, timestamp, flags);
699 if(ret >= 0) {
700 s->buf_ptr = s->buf_end; // Flush buffer
701 s->pos = s->seek(h, 0, SEEK_CUR);
702 }
703 return ret;
704}
705
8fa641f8 706/* url_open_dyn_buf and url_close_dyn_buf are used in rtp.c to send a response
b250f9c6
AJ
707 * back to the server even if CONFIG_MUXERS is false. */
708#if CONFIG_MUXERS || CONFIG_NETWORK
de6d9b64 709/* buffer handling */
899681cd 710int url_open_buf(ByteIOContext **s, uint8_t *buf, int buf_size, int flags)
de6d9b64 711{
899681cd
BA
712 int ret;
713 *s = av_mallocz(sizeof(ByteIOContext));
714 if(!*s)
715 return AVERROR(ENOMEM);
716 ret = init_put_byte(*s, buf, buf_size,
717 (flags & URL_WRONLY || flags & URL_RDWR),
718 NULL, NULL, NULL, NULL);
719 if(ret != 0)
720 av_freep(s);
721 return ret;
de6d9b64
FB
722}
723
de6d9b64
FB
724int url_close_buf(ByteIOContext *s)
725{
abba3dd1 726 put_flush_packet(s);
de6d9b64
FB
727 return s->buf_ptr - s->buffer;
728}
abba3dd1
FB
729
730/* output in a dynamic buffer */
731
732typedef struct DynBuffer {
733 int pos, size, allocated_size;
0c1a9eda 734 uint8_t *buffer;
abba3dd1 735 int io_buffer_size;
0c1a9eda 736 uint8_t io_buffer[1];
abba3dd1
FB
737} DynBuffer;
738
576ae256 739static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
abba3dd1
FB
740{
741 DynBuffer *d = opaque;
6bc03a69 742 unsigned new_size, new_allocated_size;
115329f1 743
abba3dd1
FB
744 /* reallocate buffer if needed */
745 new_size = d->pos + buf_size;
746 new_allocated_size = d->allocated_size;
568e18b1
MN
747 if(new_size < d->pos || new_size > INT_MAX/2)
748 return -1;
abba3dd1
FB
749 while (new_size > new_allocated_size) {
750 if (!new_allocated_size)
751 new_allocated_size = new_size;
752 else
115329f1 753 new_allocated_size += new_allocated_size / 2 + 1;
abba3dd1 754 }
115329f1 755
abba3dd1 756 if (new_allocated_size > d->allocated_size) {
b88ba823
MH
757 d->buffer = av_realloc(d->buffer, new_allocated_size);
758 if(d->buffer == NULL)
7ce820ef 759 return AVERROR(ENOMEM);
abba3dd1
FB
760 d->allocated_size = new_allocated_size;
761 }
762 memcpy(d->buffer + d->pos, buf, buf_size);
763 d->pos = new_size;
764 if (d->pos > d->size)
765 d->size = d->pos;
576ae256 766 return buf_size;
abba3dd1
FB
767}
768
576ae256 769static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
abba3dd1
FB
770{
771 unsigned char buf1[4];
576ae256 772 int ret;
abba3dd1
FB
773
774 /* packetized write: output the header */
aa805f94 775 AV_WB32(buf1, buf_size);
576ae256
MN
776 ret= dyn_buf_write(opaque, buf1, 4);
777 if(ret < 0)
778 return ret;
abba3dd1
FB
779
780 /* then the data */
576ae256 781 return dyn_buf_write(opaque, buf, buf_size);
abba3dd1
FB
782}
783
bc5c918e 784static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
abba3dd1
FB
785{
786 DynBuffer *d = opaque;
787
788 if (whence == SEEK_CUR)
789 offset += d->pos;
790 else if (whence == SEEK_END)
791 offset += d->size;
792 if (offset < 0 || offset > 0x7fffffffLL)
793 return -1;
794 d->pos = offset;
795 return 0;
796}
797
899681cd 798static int url_open_dyn_buf_internal(ByteIOContext **s, int max_packet_size)
abba3dd1
FB
799{
800 DynBuffer *d;
2bdaf78c 801 int ret;
0c5a43d6 802 unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
115329f1 803
568e18b1
MN
804 if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
805 return -1;
dc2c2eea 806 d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
abba3dd1 807 if (!d)
0e7ceb24 808 return AVERROR(ENOMEM);
899681cd
BA
809 *s = av_mallocz(sizeof(ByteIOContext));
810 if(!*s) {
811 av_free(d);
812 return AVERROR(ENOMEM);
813 }
abba3dd1 814 d->io_buffer_size = io_buffer_size;
899681cd 815 ret = init_put_byte(*s, d->io_buffer, io_buffer_size,
115329f1
DB
816 1, d, NULL,
817 max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
abba3dd1
FB
818 max_packet_size ? NULL : dyn_buf_seek);
819 if (ret == 0) {
899681cd
BA
820 (*s)->max_packet_size = max_packet_size;
821 } else {
822 av_free(d);
823 av_freep(s);
abba3dd1
FB
824 }
825 return ret;
826}
827
899681cd 828int url_open_dyn_buf(ByteIOContext **s)
abba3dd1
FB
829{
830 return url_open_dyn_buf_internal(s, 0);
831}
832
899681cd 833int url_open_dyn_packet_buf(ByteIOContext **s, int max_packet_size)
abba3dd1
FB
834{
835 if (max_packet_size <= 0)
836 return -1;
837 return url_open_dyn_buf_internal(s, max_packet_size);
838}
839
0c1a9eda 840int url_close_dyn_buf(ByteIOContext *s, uint8_t **pbuffer)
abba3dd1
FB
841{
842 DynBuffer *d = s->opaque;
843 int size;
844
845 put_flush_packet(s);
846
847 *pbuffer = d->buffer;
848 size = d->size;
849 av_free(d);
899681cd 850 av_free(s);
abba3dd1
FB
851 return size;
852}
8fa641f8 853#endif /* CONFIG_MUXERS || CONFIG_NETWORK */