Replace nonsense -1234 return value in dyn_buf_write by proper AVERROR(ENOMEM)
[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
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 */
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21
22#include "libavutil/crc.h"
de6d9b64 23#include "avformat.h"
5c91a675 24#include "avio.h"
abba3dd1 25#include <stdarg.h>
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26
27#define IO_BUFFER_SIZE 32768
28
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29static void fill_buffer(ByteIOContext *s);
30
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31int init_put_byte(ByteIOContext *s,
32 unsigned char *buffer,
33 int buffer_size,
34 int write_flag,
35 void *opaque,
0c1a9eda 36 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
576ae256 37 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
bc5c918e 38 int64_t (*seek)(void *opaque, int64_t offset, int whence))
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39{
40 s->buffer = buffer;
41 s->buffer_size = buffer_size;
42 s->buf_ptr = buffer;
de6d9b64 43 s->opaque = opaque;
9daa4cea 44 url_resetbuf(s, write_flag ? URL_WRONLY : URL_RDONLY);
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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;
576ae256 51 s->error = 0;
de6d9b64 52 s->is_streamed = 0;
abba3dd1 53 s->max_packet_size = 0;
ee9f36a8 54 s->update_checksum= NULL;
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MN
55 if(!read_packet && !write_flag){
56 s->pos = buffer_size;
57 s->buf_end = s->buffer + buffer_size;
58 }
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59 s->read_pause = NULL;
60 s->read_seek = NULL;
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61 return 0;
62}
115329f1 63
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64ByteIOContext *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),
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71 int64_t (*seek)(void *opaque, int64_t offset, int whence))
72{
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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
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79static void flush_buffer(ByteIOContext *s)
80{
81 if (s->buf_ptr > s->buffer) {
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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 }
465e1dad 88 if(s->update_checksum){
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89 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
90 s->checksum_ptr= s->buffer;
91 }
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92 s->pos += s->buf_ptr - s->buffer;
93 }
94 s->buf_ptr = s->buffer;
95}
96
97void put_byte(ByteIOContext *s, int b)
98{
99 *(s->buf_ptr)++ = b;
115329f1 100 if (s->buf_ptr >= s->buf_end)
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101 flush_buffer(s);
102}
103
75bdb984 104void put_buffer(ByteIOContext *s, const unsigned char *buf, int size)
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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
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 &&
150 offset1 >= 0 && offset1 < (s->buf_end - s->buffer)) {
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 &&
154 offset1 >= 0 && offset1 < (s->buf_end - s->buffer) + (1<<16)){
155 while(s->pos < offset && !s->eof_reached)
156 fill_buffer(s);
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BC
157 if (s->eof_reached)
158 return AVERROR(EPIPE);
398f5d3f 159 s->buf_ptr = s->buf_end + offset - s->pos;
f40d1739 160 } else {
bc5c918e 161 int64_t res = AVERROR(EPIPE);
68fcdbf1 162
b250f9c6 163#if CONFIG_MUXERS || CONFIG_NETWORK
f40d1739 164 if (s->write_flag) {
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165 flush_buffer(s);
166 s->must_flush = 1;
de6d9b64 167 }
b250f9c6 168#endif /* CONFIG_MUXERS || CONFIG_NETWORK */
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169 if (!s->seek || (res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
170 return res;
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BC
171 if (!s->write_flag)
172 s->buf_end = s->buffer;
173 s->buf_ptr = s->buffer;
f40d1739 174 s->pos = offset;
de6d9b64 175 }
f40d1739 176 s->eof_reached = 0;
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177 return offset;
178}
179
bc5c918e 180void url_fskip(ByteIOContext *s, int64_t offset)
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181{
182 url_fseek(s, offset, SEEK_CUR);
183}
184
bc5c918e 185int64_t url_ftell(ByteIOContext *s)
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186{
187 return url_fseek(s, 0, SEEK_CUR);
188}
189
bc5c918e 190int64_t url_fsize(ByteIOContext *s)
a965c478 191{
bc5c918e 192 int64_t size;
115329f1 193
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194 if(!s)
195 return AVERROR(EINVAL);
196
a965c478 197 if (!s->seek)
8fa36ae0 198 return AVERROR(EPIPE);
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199 size = s->seek(s->opaque, 0, AVSEEK_SIZE);
200 if(size<0){
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RB
201 if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
202 return size;
203 size++;
1ae2c5f2 204 s->seek(s->opaque, s->pos, SEEK_SET);
8e287af0 205 }
a965c478
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206 return size;
207}
208
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209int url_feof(ByteIOContext *s)
210{
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211 if(!s)
212 return 0;
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213 return s->eof_reached;
214}
215
576ae256
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216int url_ferror(ByteIOContext *s)
217{
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218 if(!s)
219 return 0;
576ae256
MN
220 return s->error;
221}
222
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223void 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
231void 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
3b4b29dc 239void put_strz(ByteIOContext *s, const char *str)
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240{
241 if (str)
242 put_buffer(s, (const unsigned char *) str, strlen(str) + 1);
243 else
244 put_byte(s, 0);
245}
246
0c1a9eda 247void put_le64(ByteIOContext *s, uint64_t val)
de6d9b64 248{
0c1a9eda
ZK
249 put_le32(s, (uint32_t)(val & 0xffffffff));
250 put_le32(s, (uint32_t)(val >> 32));
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251}
252
0c1a9eda 253void put_be64(ByteIOContext *s, uint64_t val)
de6d9b64 254{
0c1a9eda
ZK
255 put_be32(s, (uint32_t)(val >> 32));
256 put_be32(s, (uint32_t)(val & 0xffffffff));
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257}
258
259void put_le16(ByteIOContext *s, unsigned int val)
260{
261 put_byte(s, val);
262 put_byte(s, val >> 8);
263}
264
265void put_be16(ByteIOContext *s, unsigned int val)
266{
267 put_byte(s, val >> 8);
268 put_byte(s, val);
269}
270
ea395e8c
AJ
271void put_le24(ByteIOContext *s, unsigned int val)
272{
273 put_le16(s, val & 0xffff);
274 put_byte(s, val >> 16);
275}
276
a254c574
MN
277void put_be24(ByteIOContext *s, unsigned int val)
278{
279 put_be16(s, val >> 8);
280 put_byte(s, val);
281}
282
0570bf06 283void put_tag(ByteIOContext *s, const char *tag)
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284{
285 while (*tag) {
286 put_byte(s, *tag++);
287 }
288}
289
290/* Input stream */
291
292static void fill_buffer(ByteIOContext *s)
293{
f5edd874 294 uint8_t *dst= !s->max_packet_size && s->buf_end - s->buffer < s->buffer_size ? s->buf_ptr : s->buffer;
4589dc5c
MN
295 int len= s->buffer_size - (dst - s->buffer);
296
297 assert(s->buf_ptr == s->buf_end);
de6d9b64 298
abba3dd1
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299 /* no need to do anything if EOF already reached */
300 if (s->eof_reached)
301 return;
ee9f36a8 302
4589dc5c 303 if(s->update_checksum && dst == s->buffer){
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MN
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);
ee9f36a8
MN
306 s->checksum_ptr= s->buffer;
307 }
308
602dd8f6 309 if(s->read_packet)
4589dc5c
MN
310 len = s->read_packet(s->opaque, dst, len);
311 else
312 len = 0;
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313 if (len <= 0) {
314 /* do not modify buffer if EOF reached so that a seek back can
315 be done without rereading data */
de6d9b64 316 s->eof_reached = 1;
5f097703
AB
317 if(len<0)
318 s->error= len;
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319 } else {
320 s->pos += len;
4589dc5c
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321 s->buf_ptr = dst;
322 s->buf_end = dst + len;
de6d9b64
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323 }
324}
325
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DB
326unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
327 unsigned int len)
328{
3abe5fbd 329 return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
992e78f5
BC
330}
331
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DB
332unsigned long get_checksum(ByteIOContext *s)
333{
ee9f36a8 334 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
465e1dad 335 s->update_checksum= NULL;
ee9f36a8
MN
336 return s->checksum;
337}
338
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DB
339void init_checksum(ByteIOContext *s,
340 unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
341 unsigned long checksum)
342{
ee9f36a8 343 s->update_checksum= update_checksum;
465e1dad 344 if(s->update_checksum){
ccb15994 345 s->checksum= checksum;
465e1dad
MN
346 s->checksum_ptr= s->buf_ptr;
347 }
ee9f36a8
MN
348}
349
abba3dd1 350/* XXX: put an inline version */
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351int 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
abba3dd1
FB
364int 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
de6d9b64
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377int 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) {
3e2b6358 387 if(size > s->buffer_size && !s->update_checksum){
602dd8f6 388 if(s->read_packet)
2d89f334 389 len = s->read_packet(s->opaque, buf, size);
3e2b6358
MN
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 }
de6d9b64
FB
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
e15dec10
LS
420int get_partial_buffer(ByteIOContext *s, unsigned char *buf, int size)
421{
422 int len;
115329f1 423
0ecca7a4
MN
424 if(size<0)
425 return -1;
e15dec10
LS
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
de6d9b64
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439unsigned 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
ea395e8c
AJ
447unsigned 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
de6d9b64
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455unsigned int get_le32(ByteIOContext *s)
456{
457 unsigned int val;
a254c574
MN
458 val = get_le16(s);
459 val |= get_le16(s) << 16;
de6d9b64
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460 return val;
461}
462
0c1a9eda 463uint64_t get_le64(ByteIOContext *s)
de6d9b64 464{
0c1a9eda
ZK
465 uint64_t val;
466 val = (uint64_t)get_le32(s);
467 val |= (uint64_t)get_le32(s) << 32;
de6d9b64
FB
468 return val;
469}
470
471unsigned 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
a254c574 479unsigned int get_be24(ByteIOContext *s)
de6d9b64
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480{
481 unsigned int val;
a254c574 482 val = get_be16(s) << 8;
de6d9b64
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483 val |= get_byte(s);
484 return val;
485}
a254c574
MN
486unsigned 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}
de6d9b64 493
3b4b29dc 494char *get_strz(ByteIOContext *s, char *buf, int maxlen)
75bdb984
PG
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 }
115329f1 503
75bdb984
PG
504 buf[i] = 0; /* Ensure null terminated, but may be truncated */
505
506 return buf;
507}
508
0c1a9eda 509uint64_t get_be64(ByteIOContext *s)
de6d9b64 510{
0c1a9eda
ZK
511 uint64_t val;
512 val = (uint64_t)get_be32(s) << 32;
513 val |= (uint64_t)get_be32(s);
de6d9b64
FB
514 return val;
515}
516
7798b42d 517uint64_t ff_get_v(ByteIOContext *bc){
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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
899681cd 528int url_fdopen(ByteIOContext **s, URLContext *h)
de6d9b64 529{
0c1a9eda 530 uint8_t *buffer;
abba3dd1 531 int buffer_size, max_packet_size;
de6d9b64 532
115329f1 533
abba3dd1
FB
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 }
1ea4f593 540 buffer = av_malloc(buffer_size);
de6d9b64 541 if (!buffer)
8fa36ae0 542 return AVERROR(ENOMEM);
de6d9b64 543
899681cd
BA
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,
ac9fe33d 551 (h->flags & URL_WRONLY || h->flags & URL_RDWR), h,
004050ee 552 url_read, url_write, url_seek) < 0) {
1ea4f593 553 av_free(buffer);
899681cd 554 av_freep(s);
6f3e0b21 555 return AVERROR(EIO);
de6d9b64 556 }
899681cd
BA
557 (*s)->is_streamed = h->is_streamed;
558 (*s)->max_packet_size = max_packet_size;
e7e4810a 559 if(h->prot) {
502bdf68 560 (*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause;
bc5c918e 561 (*s)->read_seek = (int64_t (*)(void *, int, int64_t, int))h->prot->url_read_seek;
e7e4810a 562 }
de6d9b64
FB
563 return 0;
564}
565
de6d9b64
FB
566int url_setbufsize(ByteIOContext *s, int buf_size)
567{
0c1a9eda 568 uint8_t *buffer;
1ea4f593 569 buffer = av_malloc(buf_size);
de6d9b64 570 if (!buffer)
8fa36ae0 571 return AVERROR(ENOMEM);
de6d9b64 572
1ea4f593 573 av_free(s->buffer);
de6d9b64
FB
574 s->buffer = buffer;
575 s->buffer_size = buf_size;
576 s->buf_ptr = buffer;
770d9daf
BA
577 url_resetbuf(s, s->write_flag ? URL_WRONLY : URL_RDONLY);
578 return 0;
579}
580
581int 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 }
de6d9b64
FB
594 return 0;
595}
596
899681cd 597int url_fopen(ByteIOContext **s, const char *filename, int flags)
de6d9b64
FB
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
613int url_fclose(ByteIOContext *s)
614{
615 URLContext *h = s->opaque;
115329f1 616
1ea4f593 617 av_free(s->buffer);
899681cd 618 av_free(s);
de6d9b64
FB
619 return url_close(h);
620}
621
622URLContext *url_fileno(ByteIOContext *s)
623{
624 return s->opaque;
625}
626
b250f9c6 627#if CONFIG_MUXERS
abba3dd1
FB
628int 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}
a9e35095 640#endif //CONFIG_MUXERS
abba3dd1 641
abba3dd1
FB
642char *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
abba3dd1
FB
663int url_fget_max_packet_size(ByteIOContext *s)
664{
665 return s->max_packet_size;
666}
667
502bdf68 668int av_url_read_fpause(ByteIOContext *s, int pause)
e7e4810a
BA
669{
670 if (!s->read_pause)
671 return AVERROR(ENOSYS);
502bdf68 672 return s->read_pause(s->opaque, pause);
e7e4810a
BA
673}
674
7f37f568
DB
675int64_t av_url_read_fseek(ByteIOContext *s, int stream_index,
676 int64_t timestamp, int flags)
e7e4810a
BA
677{
678 URLContext *h = s->opaque;
bc5c918e 679 int64_t ret;
e7e4810a
BA
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
8fa641f8 690/* url_open_dyn_buf and url_close_dyn_buf are used in rtp.c to send a response
b250f9c6
AJ
691 * back to the server even if CONFIG_MUXERS is false. */
692#if CONFIG_MUXERS || CONFIG_NETWORK
de6d9b64 693/* buffer handling */
899681cd 694int url_open_buf(ByteIOContext **s, uint8_t *buf, int buf_size, int flags)
de6d9b64 695{
899681cd
BA
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;
de6d9b64
FB
706}
707
de6d9b64
FB
708int url_close_buf(ByteIOContext *s)
709{
abba3dd1 710 put_flush_packet(s);
de6d9b64
FB
711 return s->buf_ptr - s->buffer;
712}
abba3dd1
FB
713
714/* output in a dynamic buffer */
715
716typedef struct DynBuffer {
717 int pos, size, allocated_size;
0c1a9eda 718 uint8_t *buffer;
abba3dd1 719 int io_buffer_size;
0c1a9eda 720 uint8_t io_buffer[1];
abba3dd1
FB
721} DynBuffer;
722
576ae256 723static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
abba3dd1
FB
724{
725 DynBuffer *d = opaque;
6bc03a69 726 unsigned new_size, new_allocated_size;
115329f1 727
abba3dd1
FB
728 /* reallocate buffer if needed */
729 new_size = d->pos + buf_size;
730 new_allocated_size = d->allocated_size;
568e18b1
MN
731 if(new_size < d->pos || new_size > INT_MAX/2)
732 return -1;
abba3dd1
FB
733 while (new_size > new_allocated_size) {
734 if (!new_allocated_size)
735 new_allocated_size = new_size;
736 else
115329f1 737 new_allocated_size += new_allocated_size / 2 + 1;
abba3dd1 738 }
115329f1 739
abba3dd1 740 if (new_allocated_size > d->allocated_size) {
b88ba823
MH
741 d->buffer = av_realloc(d->buffer, new_allocated_size);
742 if(d->buffer == NULL)
7ce820ef 743 return AVERROR(ENOMEM);
abba3dd1
FB
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;
576ae256 750 return buf_size;
abba3dd1
FB
751}
752
576ae256 753static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
abba3dd1
FB
754{
755 unsigned char buf1[4];
576ae256 756 int ret;
abba3dd1
FB
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);
576ae256
MN
763 ret= dyn_buf_write(opaque, buf1, 4);
764 if(ret < 0)
765 return ret;
abba3dd1
FB
766
767 /* then the data */
576ae256 768 return dyn_buf_write(opaque, buf, buf_size);
abba3dd1
FB
769}
770
bc5c918e 771static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
abba3dd1
FB
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
899681cd 785static int url_open_dyn_buf_internal(ByteIOContext **s, int max_packet_size)
abba3dd1
FB
786{
787 DynBuffer *d;
788 int io_buffer_size, ret;
115329f1
DB
789
790 if (max_packet_size)
abba3dd1
FB
791 io_buffer_size = max_packet_size;
792 else
793 io_buffer_size = 1024;
115329f1 794
568e18b1
MN
795 if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
796 return -1;
abba3dd1
FB
797 d = av_malloc(sizeof(DynBuffer) + io_buffer_size);
798 if (!d)
799 return -1;
899681cd
BA
800 *s = av_mallocz(sizeof(ByteIOContext));
801 if(!*s) {
802 av_free(d);
803 return AVERROR(ENOMEM);
804 }
abba3dd1
FB
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;
899681cd 810 ret = init_put_byte(*s, d->io_buffer, io_buffer_size,
115329f1
DB
811 1, d, NULL,
812 max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
abba3dd1
FB
813 max_packet_size ? NULL : dyn_buf_seek);
814 if (ret == 0) {
899681cd
BA
815 (*s)->max_packet_size = max_packet_size;
816 } else {
817 av_free(d);
818 av_freep(s);
abba3dd1
FB
819 }
820 return ret;
821}
822
899681cd 823int url_open_dyn_buf(ByteIOContext **s)
abba3dd1
FB
824{
825 return url_open_dyn_buf_internal(s, 0);
826}
827
899681cd 828int url_open_dyn_packet_buf(ByteIOContext **s, int max_packet_size)
abba3dd1
FB
829{
830 if (max_packet_size <= 0)
831 return -1;
832 return url_open_dyn_buf_internal(s, max_packet_size);
833}
834
0c1a9eda 835int url_close_dyn_buf(ByteIOContext *s, uint8_t **pbuffer)
abba3dd1
FB
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);
899681cd 845 av_free(s);
abba3dd1
FB
846 return size;
847}
8fa641f8 848#endif /* CONFIG_MUXERS || CONFIG_NETWORK */