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ffmpeg / libavformat / aviobuf.c @ ebb92e07

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1 de6d9b64 Fabrice Bellard
/*
2
 * Buffered I/O for ffmpeg system
3 19720f15 Fabrice Bellard
 * Copyright (c) 2000,2001 Fabrice Bellard
4 de6d9b64 Fabrice Bellard
 *
5 b78e7197 Diego Biurrun
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8 19720f15 Fabrice Bellard
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10 b78e7197 Diego Biurrun
 * version 2.1 of the License, or (at your option) any later version.
11 de6d9b64 Fabrice Bellard
 *
12 b78e7197 Diego Biurrun
 * FFmpeg is distributed in the hope that it will be useful,
13 de6d9b64 Fabrice Bellard
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 19720f15 Fabrice Bellard
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16 de6d9b64 Fabrice Bellard
 *
17 19720f15 Fabrice Bellard
 * You should have received a copy of the GNU Lesser General Public
18 b78e7197 Diego Biurrun
 * License along with FFmpeg; if not, write to the Free Software
19 5509bffa Diego Biurrun
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 de6d9b64 Fabrice Bellard
 */
21 245976da Diego Biurrun
22
#include "libavutil/crc.h"
23 aa805f94 Reimar Döffinger
#include "libavutil/intreadwrite.h"
24 de6d9b64 Fabrice Bellard
#include "avformat.h"
25 5c91a675 Zdenek Kabelac
#include "avio.h"
26 ae99313a Anton Khirnov
#include "avio_internal.h"
27 603e5c0b Michael Chinen
#include "internal.h"
28 abba3dd1 Fabrice Bellard
#include <stdarg.h>
29 de6d9b64 Fabrice Bellard
30
#define IO_BUFFER_SIZE 32768
31
32 7939d0ed Martin Storsjö
/**
33
 * Do seeks within this distance ahead of the current buffer by skipping
34
 * data instead of calling the protocol seek function, for seekable
35
 * protocols.
36
 */
37
#define SHORT_SEEK_THRESHOLD 4096
38
39 471fe57e Anton Khirnov
static void fill_buffer(AVIOContext *s);
40 364cacc7 Aurelien Jacobs
#if !FF_API_URL_RESETBUF
41 471fe57e Anton Khirnov
static int url_resetbuf(AVIOContext *s, int flags);
42 08580cb0 Benoit Fouet
#endif
43 398f5d3f Michael Niedermayer
44 ae99313a Anton Khirnov
int ffio_init_context(AVIOContext *s,
45 de6d9b64 Fabrice Bellard
                  unsigned char *buffer,
46
                  int buffer_size,
47
                  int write_flag,
48
                  void *opaque,
49 0c1a9eda Zdenek Kabelac
                  int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
50 576ae256 Michael Niedermayer
                  int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
51 bc5c918e Diego Biurrun
                  int64_t (*seek)(void *opaque, int64_t offset, int whence))
52 de6d9b64 Fabrice Bellard
{
53
    s->buffer = buffer;
54
    s->buffer_size = buffer_size;
55
    s->buf_ptr = buffer;
56
    s->opaque = opaque;
57 9daa4cea Aurelien Jacobs
    url_resetbuf(s, write_flag ? URL_WRONLY : URL_RDONLY);
58 de6d9b64 Fabrice Bellard
    s->write_packet = write_packet;
59
    s->read_packet = read_packet;
60
    s->seek = seek;
61
    s->pos = 0;
62
    s->must_flush = 0;
63
    s->eof_reached = 0;
64 576ae256 Michael Niedermayer
    s->error = 0;
65 de6d9b64 Fabrice Bellard
    s->is_streamed = 0;
66 abba3dd1 Fabrice Bellard
    s->max_packet_size = 0;
67 ee9f36a8 Michael Niedermayer
    s->update_checksum= NULL;
68 942f3bb5 Michael Niedermayer
    if(!read_packet && !write_flag){
69
        s->pos = buffer_size;
70
        s->buf_end = s->buffer + buffer_size;
71
    }
72 e7e4810a Björn Axelsson
    s->read_pause = NULL;
73
    s->read_seek  = NULL;
74 de6d9b64 Fabrice Bellard
    return 0;
75
}
76 115329f1 Diego Biurrun
77 ae99313a Anton Khirnov
#if FF_API_OLD_AVIO
78
int init_put_byte(AVIOContext *s,
79
                  unsigned char *buffer,
80
                  int buffer_size,
81
                  int write_flag,
82
                  void *opaque,
83
                  int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
84
                  int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
85
                  int64_t (*seek)(void *opaque, int64_t offset, int whence))
86
{
87
    return ffio_init_context(s, buffer, buffer_size, write_flag, opaque,
88
                                read_packet, write_packet, seek);
89
}
90 90ed2776 Anton Khirnov
AVIOContext *av_alloc_put_byte(
91
                  unsigned char *buffer,
92
                  int buffer_size,
93
                  int write_flag,
94
                  void *opaque,
95
                  int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
96
                  int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
97
                  int64_t (*seek)(void *opaque, int64_t offset, int whence))
98
{
99
    return avio_alloc_context(buffer, buffer_size, write_flag, opaque,
100
                              read_packet, write_packet, seek);
101
}
102 ae99313a Anton Khirnov
#endif
103
104 90ed2776 Anton Khirnov
AVIOContext *avio_alloc_context(
105 1e0f3468 Reimar Döffinger
                  unsigned char *buffer,
106
                  int buffer_size,
107
                  int write_flag,
108
                  void *opaque,
109
                  int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
110
                  int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
111 7f37f568 Diego Biurrun
                  int64_t (*seek)(void *opaque, int64_t offset, int whence))
112
{
113 471fe57e Anton Khirnov
    AVIOContext *s = av_mallocz(sizeof(AVIOContext));
114 ae99313a Anton Khirnov
    ffio_init_context(s, buffer, buffer_size, write_flag, opaque,
115 1e0f3468 Reimar Döffinger
                  read_packet, write_packet, seek);
116
    return s;
117
}
118
119 471fe57e Anton Khirnov
static void flush_buffer(AVIOContext *s)
120 de6d9b64 Fabrice Bellard
{
121
    if (s->buf_ptr > s->buffer) {
122 576ae256 Michael Niedermayer
        if (s->write_packet && !s->error){
123 c66f53cf Martin Storsjö
            int ret= s->write_packet(s->opaque, s->buffer, s->buf_ptr - s->buffer);
124 576ae256 Michael Niedermayer
            if(ret < 0){
125
                s->error = ret;
126
            }
127
        }
128 465e1dad Michael Niedermayer
        if(s->update_checksum){
129 ee9f36a8 Michael Niedermayer
            s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
130
            s->checksum_ptr= s->buffer;
131
        }
132 de6d9b64 Fabrice Bellard
        s->pos += s->buf_ptr - s->buffer;
133
    }
134
    s->buf_ptr = s->buffer;
135
}
136
137 e9eb8d0b Anton Khirnov
void avio_w8(AVIOContext *s, int b)
138 de6d9b64 Fabrice Bellard
{
139
    *(s->buf_ptr)++ = b;
140 115329f1 Diego Biurrun
    if (s->buf_ptr >= s->buf_end)
141 de6d9b64 Fabrice Bellard
        flush_buffer(s);
142
}
143
144 2df9d000 Anton Khirnov
void ffio_fill(AVIOContext *s, int b, int count)
145 17ee8f66 Anssi Hannula
{
146
    while (count > 0) {
147
        int len = FFMIN(s->buf_end - s->buf_ptr, count);
148
        memset(s->buf_ptr, b, len);
149
        s->buf_ptr += len;
150
151
        if (s->buf_ptr >= s->buf_end)
152
            flush_buffer(s);
153
154
        count -= len;
155
    }
156
}
157
158 e9eb8d0b Anton Khirnov
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
159 de6d9b64 Fabrice Bellard
{
160
    while (size > 0) {
161 90aa6ace Reimar Döffinger
        int len = FFMIN(s->buf_end - s->buf_ptr, size);
162 de6d9b64 Fabrice Bellard
        memcpy(s->buf_ptr, buf, len);
163
        s->buf_ptr += len;
164
165 115329f1 Diego Biurrun
        if (s->buf_ptr >= s->buf_end)
166 de6d9b64 Fabrice Bellard
            flush_buffer(s);
167
168
        buf += len;
169
        size -= len;
170
    }
171
}
172
173 471fe57e Anton Khirnov
void put_flush_packet(AVIOContext *s)
174 de6d9b64 Fabrice Bellard
{
175
    flush_buffer(s);
176
    s->must_flush = 0;
177
}
178
179 471fe57e Anton Khirnov
int64_t url_fseek(AVIOContext *s, int64_t offset, int whence)
180 de6d9b64 Fabrice Bellard
{
181 bc5c918e Diego Biurrun
    int64_t offset1;
182
    int64_t pos;
183 c6a5e087 Tomas Härdin
    int force = whence & AVSEEK_FORCE;
184
    whence &= ~AVSEEK_FORCE;
185 899681cd Björn Axelsson
186
    if(!s)
187
        return AVERROR(EINVAL);
188
189
    pos = s->pos - (s->write_flag ? 0 : (s->buf_end - s->buffer));
190 de6d9b64 Fabrice Bellard
191
    if (whence != SEEK_CUR && whence != SEEK_SET)
192 8fa36ae0 François Revol
        return AVERROR(EINVAL);
193 115329f1 Diego Biurrun
194 f40d1739 Michael Niedermayer
    if (whence == SEEK_CUR) {
195
        offset1 = pos + (s->buf_ptr - s->buffer);
196
        if (offset == 0)
197
            return offset1;
198
        offset += offset1;
199
    }
200
    offset1 = offset - pos;
201
    if (!s->must_flush &&
202 b3eab9fb Baptiste Coudurier
        offset1 >= 0 && offset1 <= (s->buf_end - s->buffer)) {
203 f40d1739 Michael Niedermayer
        /* can do the seek inside the buffer */
204
        s->buf_ptr = s->buffer + offset1;
205 7939d0ed Martin Storsjö
    } else if ((s->is_streamed ||
206
               offset1 <= s->buf_end + SHORT_SEEK_THRESHOLD - s->buffer) &&
207
               !s->write_flag && offset1 >= 0 &&
208 7a6fe01f Tomas Härdin
              (whence != SEEK_END || force)) {
209 398f5d3f Michael Niedermayer
        while(s->pos < offset && !s->eof_reached)
210
            fill_buffer(s);
211 5cb4b82a Baptiste Coudurier
        if (s->eof_reached)
212 8d5e638f Stefano Sabatini
            return AVERROR_EOF;
213 398f5d3f Michael Niedermayer
        s->buf_ptr = s->buf_end + offset - s->pos;
214 f40d1739 Michael Niedermayer
    } else {
215 9d30e068 Stefano Sabatini
        int64_t res;
216 68fcdbf1 Ronald S. Bultje
217 b250f9c6 Aurelien Jacobs
#if CONFIG_MUXERS || CONFIG_NETWORK
218 f40d1739 Michael Niedermayer
        if (s->write_flag) {
219 de6d9b64 Fabrice Bellard
            flush_buffer(s);
220
            s->must_flush = 1;
221
        }
222 b250f9c6 Aurelien Jacobs
#endif /* CONFIG_MUXERS || CONFIG_NETWORK */
223 9d30e068 Stefano Sabatini
        if (!s->seek)
224
            return AVERROR(EPIPE);
225
        if ((res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
226 68fcdbf1 Ronald S. Bultje
            return res;
227 39a127bf Baptiste Coudurier
        if (!s->write_flag)
228
            s->buf_end = s->buffer;
229
        s->buf_ptr = s->buffer;
230 f40d1739 Michael Niedermayer
        s->pos = offset;
231 de6d9b64 Fabrice Bellard
    }
232 f40d1739 Michael Niedermayer
    s->eof_reached = 0;
233 de6d9b64 Fabrice Bellard
    return offset;
234
}
235
236 471fe57e Anton Khirnov
int url_fskip(AVIOContext *s, int64_t offset)
237 de6d9b64 Fabrice Bellard
{
238 d5e9ddeb Martin Storsjö
    int64_t ret = url_fseek(s, offset, SEEK_CUR);
239
    return ret < 0 ? ret : 0;
240 de6d9b64 Fabrice Bellard
}
241
242 471fe57e Anton Khirnov
int64_t url_ftell(AVIOContext *s)
243 de6d9b64 Fabrice Bellard
{
244
    return url_fseek(s, 0, SEEK_CUR);
245
}
246
247 471fe57e Anton Khirnov
int64_t url_fsize(AVIOContext *s)
248 a965c478 Aurelien Jacobs
{
249 bc5c918e Diego Biurrun
    int64_t size;
250 115329f1 Diego Biurrun
251 899681cd Björn Axelsson
    if(!s)
252
        return AVERROR(EINVAL);
253
254 a965c478 Aurelien Jacobs
    if (!s->seek)
255 4c4ef3db Stefano Sabatini
        return AVERROR(ENOSYS);
256 8e287af0 Michael Niedermayer
    size = s->seek(s->opaque, 0, AVSEEK_SIZE);
257
    if(size<0){
258 8f42f523 Ronald S. Bultje
        if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
259
            return size;
260
        size++;
261 1ae2c5f2 Michael Niedermayer
        s->seek(s->opaque, s->pos, SEEK_SET);
262 8e287af0 Michael Niedermayer
    }
263 a965c478 Aurelien Jacobs
    return size;
264
}
265
266 471fe57e Anton Khirnov
int url_feof(AVIOContext *s)
267 de6d9b64 Fabrice Bellard
{
268 899681cd Björn Axelsson
    if(!s)
269
        return 0;
270 de6d9b64 Fabrice Bellard
    return s->eof_reached;
271
}
272
273 471fe57e Anton Khirnov
int url_ferror(AVIOContext *s)
274 576ae256 Michael Niedermayer
{
275 899681cd Björn Axelsson
    if(!s)
276
        return 0;
277 576ae256 Michael Niedermayer
    return s->error;
278
}
279
280 e9eb8d0b Anton Khirnov
void avio_wl32(AVIOContext *s, unsigned int val)
281 de6d9b64 Fabrice Bellard
{
282 e9eb8d0b Anton Khirnov
    avio_w8(s, val);
283
    avio_w8(s, val >> 8);
284
    avio_w8(s, val >> 16);
285
    avio_w8(s, val >> 24);
286 de6d9b64 Fabrice Bellard
}
287
288 e9eb8d0b Anton Khirnov
void avio_wb32(AVIOContext *s, unsigned int val)
289 de6d9b64 Fabrice Bellard
{
290 e9eb8d0b Anton Khirnov
    avio_w8(s, val >> 24);
291
    avio_w8(s, val >> 16);
292
    avio_w8(s, val >> 8);
293
    avio_w8(s, val);
294 de6d9b64 Fabrice Bellard
}
295
296 e910a77b Anton Khirnov
#if FF_API_OLD_AVIO
297 471fe57e Anton Khirnov
void put_strz(AVIOContext *s, const char *str)
298 75bdb984 Philip Gladstone
{
299 e910a77b Anton Khirnov
    avio_put_str(s, str);
300
}
301 e63a3628 Anton Khirnov
302
#define GET(name, type) \
303
    type get_be ##name(AVIOContext *s) \
304
{\
305
    return avio_rb ##name(s);\
306
}\
307
    type get_le ##name(AVIOContext *s) \
308
{\
309
    return avio_rl ##name(s);\
310
}
311
312
GET(16, unsigned int)
313
GET(24, unsigned int)
314
GET(32, unsigned int)
315
GET(64, uint64_t)
316
317
#undef GET
318
319 e9eb8d0b Anton Khirnov
#define PUT(name, type ) \
320
    void put_le ##name(AVIOContext *s, type val)\
321
{\
322
        avio_wl ##name(s, val);\
323
}\
324
    void put_be ##name(AVIOContext *s, type val)\
325
{\
326
        avio_wb ##name(s, val);\
327
}
328
329
PUT(16, unsigned int)
330
PUT(24, unsigned int)
331
PUT(32, unsigned int)
332
PUT(64, uint64_t)
333
#undef PUT
334
335 e63a3628 Anton Khirnov
int get_byte(AVIOContext *s)
336
{
337
   return avio_r8(s);
338
}
339
int get_buffer(AVIOContext *s, unsigned char *buf, int size)
340
{
341
    return avio_read(s, buf, size);
342
}
343 d4e321d9 Anton Khirnov
int get_partial_buffer(AVIOContext *s, unsigned char *buf, int size)
344
{
345
    return ffio_read_partial(s, buf, size);
346
}
347 e9eb8d0b Anton Khirnov
void put_byte(AVIOContext *s, int val)
348
{
349
    avio_w8(s, val);
350
}
351
void put_buffer(AVIOContext *s, const unsigned char *buf, int size)
352
{
353
    avio_write(s, buf, size);
354
}
355 2df9d000 Anton Khirnov
void put_nbyte(AVIOContext *s, int b, int count)
356
{
357
    ffio_fill(s, b, count);
358
}
359 ebb92e07 Anton Khirnov
360
int url_fopen(AVIOContext **s, const char *filename, int flags)
361
{
362
    return avio_open(s, filename, flags);
363
}
364
int url_fclose(AVIOContext *s)
365
{
366
    return avio_close(s);
367
}
368 e910a77b Anton Khirnov
#endif
369
370 471fe57e Anton Khirnov
int avio_put_str(AVIOContext *s, const char *str)
371 e910a77b Anton Khirnov
{
372
    int len = 1;
373
    if (str) {
374
        len += strlen(str);
375 e9eb8d0b Anton Khirnov
        avio_write(s, (const unsigned char *) str, len);
376 e910a77b Anton Khirnov
    } else
377 e9eb8d0b Anton Khirnov
        avio_w8(s, 0);
378 e910a77b Anton Khirnov
    return len;
379 75bdb984 Philip Gladstone
}
380
381 471fe57e Anton Khirnov
int avio_put_str16le(AVIOContext *s, const char *str)
382 6e89b612 Anton Khirnov
{
383
    const uint8_t *q = str;
384
    int ret = 0;
385
386
    while (*q) {
387
        uint32_t ch;
388
        uint16_t tmp;
389
390
        GET_UTF8(ch, *q++, break;)
391 e9eb8d0b Anton Khirnov
        PUT_UTF16(ch, tmp, avio_wl16(s, tmp);ret += 2;)
392 6e89b612 Anton Khirnov
    }
393 e9eb8d0b Anton Khirnov
    avio_wl16(s, 0);
394 6e89b612 Anton Khirnov
    ret += 2;
395
    return ret;
396
}
397
398 603e5c0b Michael Chinen
int ff_get_v_length(uint64_t val){
399
    int i=1;
400
401
    while(val>>=7)
402
        i++;
403
404
    return i;
405
}
406
407 471fe57e Anton Khirnov
void ff_put_v(AVIOContext *bc, uint64_t val){
408 603e5c0b Michael Chinen
    int i= ff_get_v_length(val);
409
410
    while(--i>0)
411 e9eb8d0b Anton Khirnov
        avio_w8(bc, 128 | (val>>(7*i)));
412 603e5c0b Michael Chinen
413 e9eb8d0b Anton Khirnov
    avio_w8(bc, val&127);
414 603e5c0b Michael Chinen
}
415
416 e9eb8d0b Anton Khirnov
void avio_wl64(AVIOContext *s, uint64_t val)
417 de6d9b64 Fabrice Bellard
{
418 e9eb8d0b Anton Khirnov
    avio_wl32(s, (uint32_t)(val & 0xffffffff));
419
    avio_wl32(s, (uint32_t)(val >> 32));
420 de6d9b64 Fabrice Bellard
}
421
422 e9eb8d0b Anton Khirnov
void avio_wb64(AVIOContext *s, uint64_t val)
423 de6d9b64 Fabrice Bellard
{
424 e9eb8d0b Anton Khirnov
    avio_wb32(s, (uint32_t)(val >> 32));
425
    avio_wb32(s, (uint32_t)(val & 0xffffffff));
426 de6d9b64 Fabrice Bellard
}
427
428 e9eb8d0b Anton Khirnov
void avio_wl16(AVIOContext *s, unsigned int val)
429 de6d9b64 Fabrice Bellard
{
430 e9eb8d0b Anton Khirnov
    avio_w8(s, val);
431
    avio_w8(s, val >> 8);
432 de6d9b64 Fabrice Bellard
}
433
434 e9eb8d0b Anton Khirnov
void avio_wb16(AVIOContext *s, unsigned int val)
435 de6d9b64 Fabrice Bellard
{
436 e9eb8d0b Anton Khirnov
    avio_w8(s, val >> 8);
437
    avio_w8(s, val);
438 de6d9b64 Fabrice Bellard
}
439
440 e9eb8d0b Anton Khirnov
void avio_wl24(AVIOContext *s, unsigned int val)
441 ea395e8c Aurelien Jacobs
{
442 e9eb8d0b Anton Khirnov
    avio_wl16(s, val & 0xffff);
443
    avio_w8(s, val >> 16);
444 ea395e8c Aurelien Jacobs
}
445
446 e9eb8d0b Anton Khirnov
void avio_wb24(AVIOContext *s, unsigned int val)
447 a254c574 Michael Niedermayer
{
448 e9eb8d0b Anton Khirnov
    avio_wb16(s, val >> 8);
449
    avio_w8(s, val);
450 a254c574 Michael Niedermayer
}
451
452 471fe57e Anton Khirnov
void put_tag(AVIOContext *s, const char *tag)
453 de6d9b64 Fabrice Bellard
{
454
    while (*tag) {
455 e9eb8d0b Anton Khirnov
        avio_w8(s, *tag++);
456 de6d9b64 Fabrice Bellard
    }
457
}
458
459
/* Input stream */
460
461 471fe57e Anton Khirnov
static void fill_buffer(AVIOContext *s)
462 de6d9b64 Fabrice Bellard
{
463 f5edd874 Jindřich Makovička
    uint8_t *dst= !s->max_packet_size && s->buf_end - s->buffer < s->buffer_size ? s->buf_ptr : s->buffer;
464 4589dc5c Michael Niedermayer
    int len= s->buffer_size - (dst - s->buffer);
465 01d91b9b Tomas Härdin
    int max_buffer_size = s->max_packet_size ? s->max_packet_size : IO_BUFFER_SIZE;
466 4589dc5c Michael Niedermayer
467 abba3dd1 Fabrice Bellard
    /* no need to do anything if EOF already reached */
468
    if (s->eof_reached)
469
        return;
470 ee9f36a8 Michael Niedermayer
471 4589dc5c Michael Niedermayer
    if(s->update_checksum && dst == s->buffer){
472 0f0680c5 Michael Niedermayer
        if(s->buf_end > s->checksum_ptr)
473
            s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr);
474 ee9f36a8 Michael Niedermayer
        s->checksum_ptr= s->buffer;
475
    }
476
477 01d91b9b Tomas Härdin
    /* make buffer smaller in case it ended up large after probing */
478
    if (s->buffer_size > max_buffer_size) {
479
        url_setbufsize(s, max_buffer_size);
480
481
        s->checksum_ptr = dst = s->buffer;
482
        len = s->buffer_size;
483
    }
484
485 602dd8f6 Benoit Fouet
    if(s->read_packet)
486 c66f53cf Martin Storsjö
        len = s->read_packet(s->opaque, dst, len);
487 4589dc5c Michael Niedermayer
    else
488
        len = 0;
489 abba3dd1 Fabrice Bellard
    if (len <= 0) {
490
        /* do not modify buffer if EOF reached so that a seek back can
491
           be done without rereading data */
492 de6d9b64 Fabrice Bellard
        s->eof_reached = 1;
493 5f097703 Alex Beregszaszi
        if(len<0)
494
            s->error= len;
495 abba3dd1 Fabrice Bellard
    } else {
496
        s->pos += len;
497 4589dc5c Michael Niedermayer
        s->buf_ptr = dst;
498
        s->buf_end = dst + len;
499 de6d9b64 Fabrice Bellard
    }
500
}
501
502 7f37f568 Diego Biurrun
unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
503
                                    unsigned int len)
504
{
505 3abe5fbd Aurelien Jacobs
    return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
506 992e78f5 Baptiste Coudurier
}
507
508 471fe57e Anton Khirnov
unsigned long get_checksum(AVIOContext *s)
509 7f37f568 Diego Biurrun
{
510 ee9f36a8 Michael Niedermayer
    s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
511 465e1dad Michael Niedermayer
    s->update_checksum= NULL;
512 ee9f36a8 Michael Niedermayer
    return s->checksum;
513
}
514
515 471fe57e Anton Khirnov
void init_checksum(AVIOContext *s,
516 7f37f568 Diego Biurrun
                   unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
517
                   unsigned long checksum)
518
{
519 ee9f36a8 Michael Niedermayer
    s->update_checksum= update_checksum;
520 465e1dad Michael Niedermayer
    if(s->update_checksum){
521 ccb15994 Michael Niedermayer
        s->checksum= checksum;
522 465e1dad Michael Niedermayer
        s->checksum_ptr= s->buf_ptr;
523
    }
524 ee9f36a8 Michael Niedermayer
}
525
526 abba3dd1 Fabrice Bellard
/* XXX: put an inline version */
527 e63a3628 Anton Khirnov
int avio_r8(AVIOContext *s)
528 de6d9b64 Fabrice Bellard
{
529 3aa13da9 Reimar Döffinger
    if (s->buf_ptr >= s->buf_end)
530 de6d9b64 Fabrice Bellard
        fill_buffer(s);
531 853a0fcc Reimar Döffinger
    if (s->buf_ptr < s->buf_end)
532
        return *s->buf_ptr++;
533
    return 0;
534 de6d9b64 Fabrice Bellard
}
535
536 471fe57e Anton Khirnov
int url_fgetc(AVIOContext *s)
537 abba3dd1 Fabrice Bellard
{
538 3aa13da9 Reimar Döffinger
    if (s->buf_ptr >= s->buf_end)
539 abba3dd1 Fabrice Bellard
        fill_buffer(s);
540 853a0fcc Reimar Döffinger
    if (s->buf_ptr < s->buf_end)
541
        return *s->buf_ptr++;
542
    return URL_EOF;
543 abba3dd1 Fabrice Bellard
}
544
545 e63a3628 Anton Khirnov
int avio_read(AVIOContext *s, unsigned char *buf, int size)
546 de6d9b64 Fabrice Bellard
{
547
    int len, size1;
548
549
    size1 = size;
550
    while (size > 0) {
551
        len = s->buf_end - s->buf_ptr;
552
        if (len > size)
553
            len = size;
554
        if (len == 0) {
555 3e2b6358 Michael Niedermayer
            if(size > s->buffer_size && !s->update_checksum){
556 602dd8f6 Benoit Fouet
                if(s->read_packet)
557 c66f53cf Martin Storsjö
                    len = s->read_packet(s->opaque, buf, size);
558 3e2b6358 Michael Niedermayer
                if (len <= 0) {
559
                    /* do not modify buffer if EOF reached so that a seek back can
560
                    be done without rereading data */
561
                    s->eof_reached = 1;
562
                    if(len<0)
563
                        s->error= len;
564
                    break;
565
                } else {
566
                    s->pos += len;
567
                    size -= len;
568
                    buf += len;
569
                    s->buf_ptr = s->buffer;
570
                    s->buf_end = s->buffer/* + len*/;
571
                }
572
            }else{
573
                fill_buffer(s);
574
                len = s->buf_end - s->buf_ptr;
575
                if (len == 0)
576
                    break;
577
            }
578 de6d9b64 Fabrice Bellard
        } else {
579
            memcpy(buf, s->buf_ptr, len);
580
            buf += len;
581
            s->buf_ptr += len;
582
            size -= len;
583
        }
584
    }
585 7f7686df Reimar Döffinger
    if (size1 == size) {
586
        if (url_ferror(s)) return url_ferror(s);
587
        if (url_feof(s))   return AVERROR_EOF;
588
    }
589 de6d9b64 Fabrice Bellard
    return size1 - size;
590
}
591
592 d4e321d9 Anton Khirnov
int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size)
593 e15dec10 Leon van Stuivenberg
{
594
    int len;
595 115329f1 Diego Biurrun
596 0ecca7a4 Michael Niedermayer
    if(size<0)
597
        return -1;
598 e15dec10 Leon van Stuivenberg
599
    len = s->buf_end - s->buf_ptr;
600
    if (len == 0) {
601
        fill_buffer(s);
602
        len = s->buf_end - s->buf_ptr;
603
    }
604
    if (len > size)
605
        len = size;
606
    memcpy(buf, s->buf_ptr, len);
607
    s->buf_ptr += len;
608 7f7686df Reimar Döffinger
    if (!len) {
609
        if (url_ferror(s)) return url_ferror(s);
610
        if (url_feof(s))   return AVERROR_EOF;
611
    }
612 e15dec10 Leon van Stuivenberg
    return len;
613
}
614
615 e63a3628 Anton Khirnov
unsigned int avio_rl16(AVIOContext *s)
616 de6d9b64 Fabrice Bellard
{
617
    unsigned int val;
618 e63a3628 Anton Khirnov
    val = avio_r8(s);
619
    val |= avio_r8(s) << 8;
620 de6d9b64 Fabrice Bellard
    return val;
621
}
622
623 e63a3628 Anton Khirnov
unsigned int avio_rl24(AVIOContext *s)
624 ea395e8c Aurelien Jacobs
{
625
    unsigned int val;
626 e63a3628 Anton Khirnov
    val = avio_rl16(s);
627
    val |= avio_r8(s) << 16;
628 ea395e8c Aurelien Jacobs
    return val;
629
}
630
631 e63a3628 Anton Khirnov
unsigned int avio_rl32(AVIOContext *s)
632 de6d9b64 Fabrice Bellard
{
633
    unsigned int val;
634 e63a3628 Anton Khirnov
    val = avio_rl16(s);
635
    val |= avio_rl16(s) << 16;
636 de6d9b64 Fabrice Bellard
    return val;
637
}
638
639 e63a3628 Anton Khirnov
uint64_t avio_rl64(AVIOContext *s)
640 de6d9b64 Fabrice Bellard
{
641 0c1a9eda Zdenek Kabelac
    uint64_t val;
642 e63a3628 Anton Khirnov
    val = (uint64_t)avio_rl32(s);
643
    val |= (uint64_t)avio_rl32(s) << 32;
644 de6d9b64 Fabrice Bellard
    return val;
645
}
646
647 e63a3628 Anton Khirnov
unsigned int avio_rb16(AVIOContext *s)
648 de6d9b64 Fabrice Bellard
{
649
    unsigned int val;
650 e63a3628 Anton Khirnov
    val = avio_r8(s) << 8;
651
    val |= avio_r8(s);
652 de6d9b64 Fabrice Bellard
    return val;
653
}
654
655 e63a3628 Anton Khirnov
unsigned int avio_rb24(AVIOContext *s)
656 de6d9b64 Fabrice Bellard
{
657
    unsigned int val;
658 e63a3628 Anton Khirnov
    val = avio_rb16(s) << 8;
659
    val |= avio_r8(s);
660 de6d9b64 Fabrice Bellard
    return val;
661
}
662 e63a3628 Anton Khirnov
unsigned int avio_rb32(AVIOContext *s)
663 a254c574 Michael Niedermayer
{
664
    unsigned int val;
665 e63a3628 Anton Khirnov
    val = avio_rb16(s) << 16;
666
    val |= avio_rb16(s);
667 a254c574 Michael Niedermayer
    return val;
668
}
669 de6d9b64 Fabrice Bellard
670 471fe57e Anton Khirnov
char *get_strz(AVIOContext *s, char *buf, int maxlen)
671 75bdb984 Philip Gladstone
{
672
    int i = 0;
673
    char c;
674
675 e63a3628 Anton Khirnov
    while ((c = avio_r8(s))) {
676 75bdb984 Philip Gladstone
        if (i < maxlen-1)
677
            buf[i++] = c;
678
    }
679 115329f1 Diego Biurrun
680 75bdb984 Philip Gladstone
    buf[i] = 0; /* Ensure null terminated, but may be truncated */
681
682
    return buf;
683
}
684
685 471fe57e Anton Khirnov
int ff_get_line(AVIOContext *s, char *buf, int maxlen)
686 7c892951 Aurelien Jacobs
{
687
    int i = 0;
688
    char c;
689
690
    do {
691 e63a3628 Anton Khirnov
        c = avio_r8(s);
692 a43416a5 Aurelien Jacobs
        if (c && i < maxlen-1)
693 7c892951 Aurelien Jacobs
            buf[i++] = c;
694
    } while (c != '\n' && c);
695
696
    buf[i] = 0;
697 a43416a5 Aurelien Jacobs
    return i;
698 7c892951 Aurelien Jacobs
}
699
700 f9d6b13a Anton Khirnov
#define GET_STR16(type, read) \
701 471fe57e Anton Khirnov
    int avio_get_str16 ##type(AVIOContext *pb, int maxlen, char *buf, int buflen)\
702 f9d6b13a Anton Khirnov
{\
703
    char* q = buf;\
704
    int ret = 0;\
705
    while (ret + 1 < maxlen) {\
706
        uint8_t tmp;\
707
        uint32_t ch;\
708
        GET_UTF16(ch, (ret += 2) <= maxlen ? read(pb) : 0, break;)\
709
        if (!ch)\
710
            break;\
711
        PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)\
712
    }\
713
    *q = 0;\
714
    return ret;\
715
}\
716
717 e63a3628 Anton Khirnov
GET_STR16(le, avio_rl16)
718
GET_STR16(be, avio_rb16)
719 f9d6b13a Anton Khirnov
720
#undef GET_STR16
721
722 e63a3628 Anton Khirnov
uint64_t avio_rb64(AVIOContext *s)
723 de6d9b64 Fabrice Bellard
{
724 0c1a9eda Zdenek Kabelac
    uint64_t val;
725 e63a3628 Anton Khirnov
    val = (uint64_t)avio_rb32(s) << 32;
726
    val |= (uint64_t)avio_rb32(s);
727 de6d9b64 Fabrice Bellard
    return val;
728
}
729
730 471fe57e Anton Khirnov
uint64_t ff_get_v(AVIOContext *bc){
731 897d3eef Kostya Shishkov
    uint64_t val = 0;
732
    int tmp;
733
734
    do{
735 e63a3628 Anton Khirnov
        tmp = avio_r8(bc);
736 897d3eef Kostya Shishkov
        val= (val<<7) + (tmp&127);
737
    }while(tmp&128);
738
    return val;
739
}
740
741 471fe57e Anton Khirnov
int url_fdopen(AVIOContext **s, URLContext *h)
742 de6d9b64 Fabrice Bellard
{
743 0c1a9eda Zdenek Kabelac
    uint8_t *buffer;
744 abba3dd1 Fabrice Bellard
    int buffer_size, max_packet_size;
745 de6d9b64 Fabrice Bellard
746 abba3dd1 Fabrice Bellard
    max_packet_size = url_get_max_packet_size(h);
747
    if (max_packet_size) {
748
        buffer_size = max_packet_size; /* no need to bufferize more than one packet */
749
    } else {
750
        buffer_size = IO_BUFFER_SIZE;
751
    }
752 1ea4f593 Fabrice Bellard
    buffer = av_malloc(buffer_size);
753 de6d9b64 Fabrice Bellard
    if (!buffer)
754 8fa36ae0 François Revol
        return AVERROR(ENOMEM);
755 de6d9b64 Fabrice Bellard
756 471fe57e Anton Khirnov
    *s = av_mallocz(sizeof(AVIOContext));
757 899681cd Björn Axelsson
    if(!*s) {
758
        av_free(buffer);
759
        return AVERROR(ENOMEM);
760
    }
761
762 ae99313a Anton Khirnov
    if (ffio_init_context(*s, buffer, buffer_size,
763 ac9fe33d Gildas Bazin
                      (h->flags & URL_WRONLY || h->flags & URL_RDWR), h,
764 004050ee Michael Niedermayer
                      url_read, url_write, url_seek) < 0) {
765 1ea4f593 Fabrice Bellard
        av_free(buffer);
766 899681cd Björn Axelsson
        av_freep(s);
767 6f3e0b21 Panagiotis Issaris
        return AVERROR(EIO);
768 de6d9b64 Fabrice Bellard
    }
769 899681cd Björn Axelsson
    (*s)->is_streamed = h->is_streamed;
770
    (*s)->max_packet_size = max_packet_size;
771 e7e4810a Björn Axelsson
    if(h->prot) {
772 502bdf68 Michael Niedermayer
        (*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause;
773 bc5c918e Diego Biurrun
        (*s)->read_seek  = (int64_t (*)(void *, int, int64_t, int))h->prot->url_read_seek;
774 e7e4810a Björn Axelsson
    }
775 de6d9b64 Fabrice Bellard
    return 0;
776
}
777
778 471fe57e Anton Khirnov
int url_setbufsize(AVIOContext *s, int buf_size)
779 de6d9b64 Fabrice Bellard
{
780 0c1a9eda Zdenek Kabelac
    uint8_t *buffer;
781 1ea4f593 Fabrice Bellard
    buffer = av_malloc(buf_size);
782 de6d9b64 Fabrice Bellard
    if (!buffer)
783 8fa36ae0 François Revol
        return AVERROR(ENOMEM);
784 de6d9b64 Fabrice Bellard
785 1ea4f593 Fabrice Bellard
    av_free(s->buffer);
786 de6d9b64 Fabrice Bellard
    s->buffer = buffer;
787
    s->buffer_size = buf_size;
788
    s->buf_ptr = buffer;
789 770d9daf Björn Axelsson
    url_resetbuf(s, s->write_flag ? URL_WRONLY : URL_RDONLY);
790
    return 0;
791
}
792
793 364cacc7 Aurelien Jacobs
#if FF_API_URL_RESETBUF
794 471fe57e Anton Khirnov
int url_resetbuf(AVIOContext *s, int flags)
795 08580cb0 Benoit Fouet
#else
796 471fe57e Anton Khirnov
static int url_resetbuf(AVIOContext *s, int flags)
797 08580cb0 Benoit Fouet
#endif
798 770d9daf Björn Axelsson
{
799 364cacc7 Aurelien Jacobs
#if FF_API_URL_RESETBUF
800 6fa197e2 Eli Friedman
    if (flags & URL_RDWR)
801 770d9daf Björn Axelsson
        return AVERROR(EINVAL);
802 08580cb0 Benoit Fouet
#else
803
    assert(flags == URL_WRONLY || flags == URL_RDONLY);
804
#endif
805 770d9daf Björn Axelsson
806
    if (flags & URL_WRONLY) {
807
        s->buf_end = s->buffer + s->buffer_size;
808
        s->write_flag = 1;
809
    } else {
810
        s->buf_end = s->buffer;
811
        s->write_flag = 0;
812
    }
813 de6d9b64 Fabrice Bellard
    return 0;
814
}
815
816 471fe57e Anton Khirnov
int ff_rewind_with_probe_data(AVIOContext *s, unsigned char *buf, int buf_size)
817 01d91b9b Tomas Härdin
{
818
    int64_t buffer_start;
819
    int buffer_size;
820 496c645d Martin Storsjö
    int overlap, new_size, alloc_size;
821 01d91b9b Tomas Härdin
822
    if (s->write_flag)
823
        return AVERROR(EINVAL);
824
825
    buffer_size = s->buf_end - s->buffer;
826
827
    /* the buffers must touch or overlap */
828
    if ((buffer_start = s->pos - buffer_size) > buf_size)
829
        return AVERROR(EINVAL);
830
831
    overlap = buf_size - buffer_start;
832
    new_size = buf_size + buffer_size - overlap;
833
834 496c645d Martin Storsjö
    alloc_size = FFMAX(s->buffer_size, new_size);
835
    if (alloc_size > buf_size)
836
        if (!(buf = av_realloc(buf, alloc_size)))
837 01d91b9b Tomas Härdin
            return AVERROR(ENOMEM);
838
839 496c645d Martin Storsjö
    if (new_size > buf_size) {
840 01d91b9b Tomas Härdin
        memcpy(buf + buf_size, s->buffer + overlap, buffer_size - overlap);
841
        buf_size = new_size;
842
    }
843
844
    av_free(s->buffer);
845
    s->buf_ptr = s->buffer = buf;
846 496c645d Martin Storsjö
    s->buffer_size = alloc_size;
847
    s->pos = buf_size;
848 01d91b9b Tomas Härdin
    s->buf_end = s->buf_ptr + buf_size;
849
    s->eof_reached = 0;
850
    s->must_flush = 0;
851
852
    return 0;
853
}
854
855 ebb92e07 Anton Khirnov
int avio_open(AVIOContext **s, const char *filename, int flags)
856 de6d9b64 Fabrice Bellard
{
857
    URLContext *h;
858
    int err;
859
860
    err = url_open(&h, filename, flags);
861
    if (err < 0)
862
        return err;
863
    err = url_fdopen(s, h);
864
    if (err < 0) {
865
        url_close(h);
866
        return err;
867
    }
868
    return 0;
869
}
870
871 ebb92e07 Anton Khirnov
int avio_close(AVIOContext *s)
872 de6d9b64 Fabrice Bellard
{
873
    URLContext *h = s->opaque;
874 115329f1 Diego Biurrun
875 1ea4f593 Fabrice Bellard
    av_free(s->buffer);
876 899681cd Björn Axelsson
    av_free(s);
877 de6d9b64 Fabrice Bellard
    return url_close(h);
878
}
879
880 471fe57e Anton Khirnov
URLContext *url_fileno(AVIOContext *s)
881 de6d9b64 Fabrice Bellard
{
882
    return s->opaque;
883
}
884
885 b250f9c6 Aurelien Jacobs
#if CONFIG_MUXERS
886 471fe57e Anton Khirnov
int url_fprintf(AVIOContext *s, const char *fmt, ...)
887 abba3dd1 Fabrice Bellard
{
888
    va_list ap;
889
    char buf[4096];
890
    int ret;
891
892
    va_start(ap, fmt);
893
    ret = vsnprintf(buf, sizeof(buf), fmt, ap);
894
    va_end(ap);
895 e9eb8d0b Anton Khirnov
    avio_write(s, buf, strlen(buf));
896 abba3dd1 Fabrice Bellard
    return ret;
897
}
898 a9e35095 Diego Biurrun
#endif //CONFIG_MUXERS
899 abba3dd1 Fabrice Bellard
900 471fe57e Anton Khirnov
char *url_fgets(AVIOContext *s, char *buf, int buf_size)
901 abba3dd1 Fabrice Bellard
{
902
    int c;
903
    char *q;
904
905
    c = url_fgetc(s);
906
    if (c == EOF)
907
        return NULL;
908
    q = buf;
909
    for(;;) {
910
        if (c == EOF || c == '\n')
911
            break;
912
        if ((q - buf) < buf_size - 1)
913
            *q++ = c;
914
        c = url_fgetc(s);
915
    }
916
    if (buf_size > 0)
917
        *q = '\0';
918
    return buf;
919
}
920
921 471fe57e Anton Khirnov
int url_fget_max_packet_size(AVIOContext *s)
922 abba3dd1 Fabrice Bellard
{
923
    return s->max_packet_size;
924
}
925
926 471fe57e Anton Khirnov
int av_url_read_fpause(AVIOContext *s, int pause)
927 e7e4810a Björn Axelsson
{
928
    if (!s->read_pause)
929
        return AVERROR(ENOSYS);
930 502bdf68 Michael Niedermayer
    return s->read_pause(s->opaque, pause);
931 e7e4810a Björn Axelsson
}
932
933 471fe57e Anton Khirnov
int64_t av_url_read_fseek(AVIOContext *s, int stream_index,
934 7f37f568 Diego Biurrun
                          int64_t timestamp, int flags)
935 e7e4810a Björn Axelsson
{
936
    URLContext *h = s->opaque;
937 bc5c918e Diego Biurrun
    int64_t ret;
938 e7e4810a Björn Axelsson
    if (!s->read_seek)
939
        return AVERROR(ENOSYS);
940
    ret = s->read_seek(h, stream_index, timestamp, flags);
941
    if(ret >= 0) {
942 c007c687 Howard Chu
        int64_t pos;
943 e7e4810a Björn Axelsson
        s->buf_ptr = s->buf_end; // Flush buffer
944 c007c687 Howard Chu
        pos = s->seek(h, 0, SEEK_CUR);
945
        if (pos >= 0)
946
            s->pos = pos;
947
        else if (pos != AVERROR(ENOSYS))
948
            ret = pos;
949 e7e4810a Björn Axelsson
    }
950
    return ret;
951
}
952
953 8fa641f8 Loïc Le Loarer
/* url_open_dyn_buf and url_close_dyn_buf are used in rtp.c to send a response
954 b250f9c6 Aurelien Jacobs
 * back to the server even if CONFIG_MUXERS is false. */
955
#if CONFIG_MUXERS || CONFIG_NETWORK
956 de6d9b64 Fabrice Bellard
/* buffer handling */
957 471fe57e Anton Khirnov
int url_open_buf(AVIOContext **s, uint8_t *buf, int buf_size, int flags)
958 de6d9b64 Fabrice Bellard
{
959 899681cd Björn Axelsson
    int ret;
960 471fe57e Anton Khirnov
    *s = av_mallocz(sizeof(AVIOContext));
961 899681cd Björn Axelsson
    if(!*s)
962
        return AVERROR(ENOMEM);
963 ae99313a Anton Khirnov
    ret = ffio_init_context(*s, buf, buf_size,
964 899681cd Björn Axelsson
                        (flags & URL_WRONLY || flags & URL_RDWR),
965
                        NULL, NULL, NULL, NULL);
966
    if(ret != 0)
967
        av_freep(s);
968
    return ret;
969 de6d9b64 Fabrice Bellard
}
970
971 471fe57e Anton Khirnov
int url_close_buf(AVIOContext *s)
972 de6d9b64 Fabrice Bellard
{
973 abba3dd1 Fabrice Bellard
    put_flush_packet(s);
974 de6d9b64 Fabrice Bellard
    return s->buf_ptr - s->buffer;
975
}
976 abba3dd1 Fabrice Bellard
977
/* output in a dynamic buffer */
978
979
typedef struct DynBuffer {
980
    int pos, size, allocated_size;
981 0c1a9eda Zdenek Kabelac
    uint8_t *buffer;
982 abba3dd1 Fabrice Bellard
    int io_buffer_size;
983 0c1a9eda Zdenek Kabelac
    uint8_t io_buffer[1];
984 abba3dd1 Fabrice Bellard
} DynBuffer;
985
986 576ae256 Michael Niedermayer
static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
987 abba3dd1 Fabrice Bellard
{
988
    DynBuffer *d = opaque;
989 6bc03a69 Reimar Döffinger
    unsigned new_size, new_allocated_size;
990 115329f1 Diego Biurrun
991 abba3dd1 Fabrice Bellard
    /* reallocate buffer if needed */
992
    new_size = d->pos + buf_size;
993
    new_allocated_size = d->allocated_size;
994 568e18b1 Michael Niedermayer
    if(new_size < d->pos || new_size > INT_MAX/2)
995
        return -1;
996 abba3dd1 Fabrice Bellard
    while (new_size > new_allocated_size) {
997
        if (!new_allocated_size)
998
            new_allocated_size = new_size;
999
        else
1000 115329f1 Diego Biurrun
            new_allocated_size += new_allocated_size / 2 + 1;
1001 abba3dd1 Fabrice Bellard
    }
1002 115329f1 Diego Biurrun
1003 abba3dd1 Fabrice Bellard
    if (new_allocated_size > d->allocated_size) {
1004 b88ba823 Mark Hills
        d->buffer = av_realloc(d->buffer, new_allocated_size);
1005
        if(d->buffer == NULL)
1006 7ce820ef Reimar Döffinger
             return AVERROR(ENOMEM);
1007 abba3dd1 Fabrice Bellard
        d->allocated_size = new_allocated_size;
1008
    }
1009
    memcpy(d->buffer + d->pos, buf, buf_size);
1010
    d->pos = new_size;
1011
    if (d->pos > d->size)
1012
        d->size = d->pos;
1013 576ae256 Michael Niedermayer
    return buf_size;
1014 abba3dd1 Fabrice Bellard
}
1015
1016 576ae256 Michael Niedermayer
static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
1017 abba3dd1 Fabrice Bellard
{
1018
    unsigned char buf1[4];
1019 576ae256 Michael Niedermayer
    int ret;
1020 abba3dd1 Fabrice Bellard
1021
    /* packetized write: output the header */
1022 aa805f94 Reimar Döffinger
    AV_WB32(buf1, buf_size);
1023 576ae256 Michael Niedermayer
    ret= dyn_buf_write(opaque, buf1, 4);
1024
    if(ret < 0)
1025
        return ret;
1026 abba3dd1 Fabrice Bellard
1027
    /* then the data */
1028 576ae256 Michael Niedermayer
    return dyn_buf_write(opaque, buf, buf_size);
1029 abba3dd1 Fabrice Bellard
}
1030
1031 bc5c918e Diego Biurrun
static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
1032 abba3dd1 Fabrice Bellard
{
1033
    DynBuffer *d = opaque;
1034
1035
    if (whence == SEEK_CUR)
1036
        offset += d->pos;
1037
    else if (whence == SEEK_END)
1038
        offset += d->size;
1039
    if (offset < 0 || offset > 0x7fffffffLL)
1040
        return -1;
1041
    d->pos = offset;
1042
    return 0;
1043
}
1044
1045 471fe57e Anton Khirnov
static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size)
1046 abba3dd1 Fabrice Bellard
{
1047
    DynBuffer *d;
1048 2bdaf78c Reimar Döffinger
    int ret;
1049 0c5a43d6 Reimar Döffinger
    unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
1050 115329f1 Diego Biurrun
1051 568e18b1 Michael Niedermayer
    if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
1052
        return -1;
1053 dc2c2eea Reimar Döffinger
    d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
1054 abba3dd1 Fabrice Bellard
    if (!d)
1055 0e7ceb24 Reimar Döffinger
        return AVERROR(ENOMEM);
1056 471fe57e Anton Khirnov
    *s = av_mallocz(sizeof(AVIOContext));
1057 899681cd Björn Axelsson
    if(!*s) {
1058
        av_free(d);
1059
        return AVERROR(ENOMEM);
1060
    }
1061 abba3dd1 Fabrice Bellard
    d->io_buffer_size = io_buffer_size;
1062 ae99313a Anton Khirnov
    ret = ffio_init_context(*s, d->io_buffer, io_buffer_size,
1063 115329f1 Diego Biurrun
                        1, d, NULL,
1064
                        max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
1065 abba3dd1 Fabrice Bellard
                        max_packet_size ? NULL : dyn_buf_seek);
1066
    if (ret == 0) {
1067 899681cd Björn Axelsson
        (*s)->max_packet_size = max_packet_size;
1068
    } else {
1069
        av_free(d);
1070
        av_freep(s);
1071 abba3dd1 Fabrice Bellard
    }
1072
    return ret;
1073
}
1074
1075 471fe57e Anton Khirnov
int url_open_dyn_buf(AVIOContext **s)
1076 abba3dd1 Fabrice Bellard
{
1077
    return url_open_dyn_buf_internal(s, 0);
1078
}
1079
1080 471fe57e Anton Khirnov
int url_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
1081 abba3dd1 Fabrice Bellard
{
1082
    if (max_packet_size <= 0)
1083
        return -1;
1084
    return url_open_dyn_buf_internal(s, max_packet_size);
1085
}
1086
1087 471fe57e Anton Khirnov
int url_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
1088 abba3dd1 Fabrice Bellard
{
1089
    DynBuffer *d = s->opaque;
1090
    int size;
1091 de1807bb Josh Allmann
    static const char padbuf[FF_INPUT_BUFFER_PADDING_SIZE] = {0};
1092
    int padding = 0;
1093
1094
    /* don't attempt to pad fixed-size packet buffers */
1095
    if (!s->max_packet_size) {
1096 e9eb8d0b Anton Khirnov
        avio_write(s, padbuf, sizeof(padbuf));
1097 de1807bb Josh Allmann
        padding = FF_INPUT_BUFFER_PADDING_SIZE;
1098
    }
1099 abba3dd1 Fabrice Bellard
1100
    put_flush_packet(s);
1101
1102
    *pbuffer = d->buffer;
1103
    size = d->size;
1104
    av_free(d);
1105 899681cd Björn Axelsson
    av_free(s);
1106 de1807bb Josh Allmann
    return size - padding;
1107 abba3dd1 Fabrice Bellard
}
1108 8fa641f8 Loïc Le Loarer
#endif /* CONFIG_MUXERS || CONFIG_NETWORK */