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ffmpeg / libavformat / aviobuf.c @ e16ead07

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1
/*
2
 * Buffered I/O for ffmpeg system
3
 * Copyright (c) 2000,2001 Fabrice Bellard
4
 *
5
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
11
 *
12
 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16
 *
17
 * You should have received a copy of the GNU Lesser General Public
18
 * License along with FFmpeg; if not, write to the Free Software
19
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
 */
21

    
22
#include "libavutil/crc.h"
23
#include "libavutil/intreadwrite.h"
24
#include "avformat.h"
25
#include "avio.h"
26
#include "avio_internal.h"
27
#include "internal.h"
28
#include <stdarg.h>
29

    
30
#define IO_BUFFER_SIZE 32768
31

    
32
/**
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
static void fill_buffer(AVIOContext *s);
40
#if !FF_API_URL_RESETBUF
41
static int url_resetbuf(AVIOContext *s, int flags);
42
#endif
43

    
44
int ffio_init_context(AVIOContext *s,
45
                  unsigned char *buffer,
46
                  int buffer_size,
47
                  int write_flag,
48
                  void *opaque,
49
                  int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
50
                  int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
51
                  int64_t (*seek)(void *opaque, int64_t offset, int whence))
52
{
53
    s->buffer = buffer;
54
    s->buffer_size = buffer_size;
55
    s->buf_ptr = buffer;
56
    s->opaque = opaque;
57
    url_resetbuf(s, write_flag ? URL_WRONLY : URL_RDONLY);
58
    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
    s->error = 0;
65
    s->is_streamed = 0;
66
    s->max_packet_size = 0;
67
    s->update_checksum= NULL;
68
    if(!read_packet && !write_flag){
69
        s->pos = buffer_size;
70
        s->buf_end = s->buffer + buffer_size;
71
    }
72
    s->read_pause = NULL;
73
    s->read_seek  = NULL;
74
    return 0;
75
}
76

    
77
#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
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
#endif
103

    
104
AVIOContext *avio_alloc_context(
105
                  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
                  int64_t (*seek)(void *opaque, int64_t offset, int whence))
112
{
113
    AVIOContext *s = av_mallocz(sizeof(AVIOContext));
114
    ffio_init_context(s, buffer, buffer_size, write_flag, opaque,
115
                  read_packet, write_packet, seek);
116
    return s;
117
}
118

    
119
static void flush_buffer(AVIOContext *s)
120
{
121
    if (s->buf_ptr > s->buffer) {
122
        if (s->write_packet && !s->error){
123
            int ret= s->write_packet(s->opaque, s->buffer, s->buf_ptr - s->buffer);
124
            if(ret < 0){
125
                s->error = ret;
126
            }
127
        }
128
        if(s->update_checksum){
129
            s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
130
            s->checksum_ptr= s->buffer;
131
        }
132
        s->pos += s->buf_ptr - s->buffer;
133
    }
134
    s->buf_ptr = s->buffer;
135
}
136

    
137
void avio_w8(AVIOContext *s, int b)
138
{
139
    *(s->buf_ptr)++ = b;
140
    if (s->buf_ptr >= s->buf_end)
141
        flush_buffer(s);
142
}
143

    
144
void ffio_fill(AVIOContext *s, int b, int count)
145
{
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
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
159
{
160
    while (size > 0) {
161
        int len = FFMIN(s->buf_end - s->buf_ptr, size);
162
        memcpy(s->buf_ptr, buf, len);
163
        s->buf_ptr += len;
164

    
165
        if (s->buf_ptr >= s->buf_end)
166
            flush_buffer(s);
167

    
168
        buf += len;
169
        size -= len;
170
    }
171
}
172

    
173
void put_flush_packet(AVIOContext *s)
174
{
175
    flush_buffer(s);
176
    s->must_flush = 0;
177
}
178

    
179
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
180
{
181
    int64_t offset1;
182
    int64_t pos;
183
    int force = whence & AVSEEK_FORCE;
184
    whence &= ~AVSEEK_FORCE;
185

    
186
    if(!s)
187
        return AVERROR(EINVAL);
188

    
189
    pos = s->pos - (s->write_flag ? 0 : (s->buf_end - s->buffer));
190

    
191
    if (whence != SEEK_CUR && whence != SEEK_SET)
192
        return AVERROR(EINVAL);
193

    
194
    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
        offset1 >= 0 && offset1 <= (s->buf_end - s->buffer)) {
203
        /* can do the seek inside the buffer */
204
        s->buf_ptr = s->buffer + offset1;
205
    } else if ((s->is_streamed ||
206
               offset1 <= s->buf_end + SHORT_SEEK_THRESHOLD - s->buffer) &&
207
               !s->write_flag && offset1 >= 0 &&
208
              (whence != SEEK_END || force)) {
209
        while(s->pos < offset && !s->eof_reached)
210
            fill_buffer(s);
211
        if (s->eof_reached)
212
            return AVERROR_EOF;
213
        s->buf_ptr = s->buf_end + offset - s->pos;
214
    } else {
215
        int64_t res;
216

    
217
#if CONFIG_MUXERS || CONFIG_NETWORK
218
        if (s->write_flag) {
219
            flush_buffer(s);
220
            s->must_flush = 1;
221
        }
222
#endif /* CONFIG_MUXERS || CONFIG_NETWORK */
223
        if (!s->seek)
224
            return AVERROR(EPIPE);
225
        if ((res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
226
            return res;
227
        if (!s->write_flag)
228
            s->buf_end = s->buffer;
229
        s->buf_ptr = s->buffer;
230
        s->pos = offset;
231
    }
232
    s->eof_reached = 0;
233
    return offset;
234
}
235

    
236
#if FF_API_OLD_AVIO
237
int url_fskip(AVIOContext *s, int64_t offset)
238
{
239
    int64_t ret = avio_seek(s, offset, SEEK_CUR);
240
    return ret < 0 ? ret : 0;
241
}
242
#endif
243

    
244
int64_t url_ftell(AVIOContext *s)
245
{
246
    return avio_seek(s, 0, SEEK_CUR);
247
}
248

    
249
int64_t url_fsize(AVIOContext *s)
250
{
251
    int64_t size;
252

    
253
    if(!s)
254
        return AVERROR(EINVAL);
255

    
256
    if (!s->seek)
257
        return AVERROR(ENOSYS);
258
    size = s->seek(s->opaque, 0, AVSEEK_SIZE);
259
    if(size<0){
260
        if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
261
            return size;
262
        size++;
263
        s->seek(s->opaque, s->pos, SEEK_SET);
264
    }
265
    return size;
266
}
267

    
268
int url_feof(AVIOContext *s)
269
{
270
    if(!s)
271
        return 0;
272
    return s->eof_reached;
273
}
274

    
275
int url_ferror(AVIOContext *s)
276
{
277
    if(!s)
278
        return 0;
279
    return s->error;
280
}
281

    
282
void avio_wl32(AVIOContext *s, unsigned int val)
283
{
284
    avio_w8(s, val);
285
    avio_w8(s, val >> 8);
286
    avio_w8(s, val >> 16);
287
    avio_w8(s, val >> 24);
288
}
289

    
290
void avio_wb32(AVIOContext *s, unsigned int val)
291
{
292
    avio_w8(s, val >> 24);
293
    avio_w8(s, val >> 16);
294
    avio_w8(s, val >> 8);
295
    avio_w8(s, val);
296
}
297

    
298
#if FF_API_OLD_AVIO
299
void put_strz(AVIOContext *s, const char *str)
300
{
301
    avio_put_str(s, str);
302
}
303

    
304
#define GET(name, type) \
305
    type get_be ##name(AVIOContext *s) \
306
{\
307
    return avio_rb ##name(s);\
308
}\
309
    type get_le ##name(AVIOContext *s) \
310
{\
311
    return avio_rl ##name(s);\
312
}
313

    
314
GET(16, unsigned int)
315
GET(24, unsigned int)
316
GET(32, unsigned int)
317
GET(64, uint64_t)
318

    
319
#undef GET
320

    
321
#define PUT(name, type ) \
322
    void put_le ##name(AVIOContext *s, type val)\
323
{\
324
        avio_wl ##name(s, val);\
325
}\
326
    void put_be ##name(AVIOContext *s, type val)\
327
{\
328
        avio_wb ##name(s, val);\
329
}
330

    
331
PUT(16, unsigned int)
332
PUT(24, unsigned int)
333
PUT(32, unsigned int)
334
PUT(64, uint64_t)
335
#undef PUT
336

    
337
int get_byte(AVIOContext *s)
338
{
339
   return avio_r8(s);
340
}
341
int get_buffer(AVIOContext *s, unsigned char *buf, int size)
342
{
343
    return avio_read(s, buf, size);
344
}
345
int get_partial_buffer(AVIOContext *s, unsigned char *buf, int size)
346
{
347
    return ffio_read_partial(s, buf, size);
348
}
349
void put_byte(AVIOContext *s, int val)
350
{
351
    avio_w8(s, val);
352
}
353
void put_buffer(AVIOContext *s, const unsigned char *buf, int size)
354
{
355
    avio_write(s, buf, size);
356
}
357
void put_nbyte(AVIOContext *s, int b, int count)
358
{
359
    ffio_fill(s, b, count);
360
}
361

    
362
int url_fopen(AVIOContext **s, const char *filename, int flags)
363
{
364
    return avio_open(s, filename, flags);
365
}
366
int url_fclose(AVIOContext *s)
367
{
368
    return avio_close(s);
369
}
370
int64_t url_fseek(AVIOContext *s, int64_t offset, int whence)
371
{
372
    return avio_seek(s, offset, whence);
373
}
374
#endif
375

    
376
int avio_put_str(AVIOContext *s, const char *str)
377
{
378
    int len = 1;
379
    if (str) {
380
        len += strlen(str);
381
        avio_write(s, (const unsigned char *) str, len);
382
    } else
383
        avio_w8(s, 0);
384
    return len;
385
}
386

    
387
int avio_put_str16le(AVIOContext *s, const char *str)
388
{
389
    const uint8_t *q = str;
390
    int ret = 0;
391

    
392
    while (*q) {
393
        uint32_t ch;
394
        uint16_t tmp;
395

    
396
        GET_UTF8(ch, *q++, break;)
397
        PUT_UTF16(ch, tmp, avio_wl16(s, tmp);ret += 2;)
398
    }
399
    avio_wl16(s, 0);
400
    ret += 2;
401
    return ret;
402
}
403

    
404
int ff_get_v_length(uint64_t val){
405
    int i=1;
406

    
407
    while(val>>=7)
408
        i++;
409

    
410
    return i;
411
}
412

    
413
void ff_put_v(AVIOContext *bc, uint64_t val){
414
    int i= ff_get_v_length(val);
415

    
416
    while(--i>0)
417
        avio_w8(bc, 128 | (val>>(7*i)));
418

    
419
    avio_w8(bc, val&127);
420
}
421

    
422
void avio_wl64(AVIOContext *s, uint64_t val)
423
{
424
    avio_wl32(s, (uint32_t)(val & 0xffffffff));
425
    avio_wl32(s, (uint32_t)(val >> 32));
426
}
427

    
428
void avio_wb64(AVIOContext *s, uint64_t val)
429
{
430
    avio_wb32(s, (uint32_t)(val >> 32));
431
    avio_wb32(s, (uint32_t)(val & 0xffffffff));
432
}
433

    
434
void avio_wl16(AVIOContext *s, unsigned int val)
435
{
436
    avio_w8(s, val);
437
    avio_w8(s, val >> 8);
438
}
439

    
440
void avio_wb16(AVIOContext *s, unsigned int val)
441
{
442
    avio_w8(s, val >> 8);
443
    avio_w8(s, val);
444
}
445

    
446
void avio_wl24(AVIOContext *s, unsigned int val)
447
{
448
    avio_wl16(s, val & 0xffff);
449
    avio_w8(s, val >> 16);
450
}
451

    
452
void avio_wb24(AVIOContext *s, unsigned int val)
453
{
454
    avio_wb16(s, val >> 8);
455
    avio_w8(s, val);
456
}
457

    
458
#if FF_API_OLD_AVIO
459
void put_tag(AVIOContext *s, const char *tag)
460
{
461
    while (*tag) {
462
        avio_w8(s, *tag++);
463
    }
464
}
465
#endif
466

    
467
/* Input stream */
468

    
469
static void fill_buffer(AVIOContext *s)
470
{
471
    uint8_t *dst= !s->max_packet_size && s->buf_end - s->buffer < s->buffer_size ? s->buf_end : s->buffer;
472
    int len= s->buffer_size - (dst - s->buffer);
473
    int max_buffer_size = s->max_packet_size ? s->max_packet_size : IO_BUFFER_SIZE;
474

    
475
    /* no need to do anything if EOF already reached */
476
    if (s->eof_reached)
477
        return;
478

    
479
    if(s->update_checksum && dst == s->buffer){
480
        if(s->buf_end > s->checksum_ptr)
481
            s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr);
482
        s->checksum_ptr= s->buffer;
483
    }
484

    
485
    /* make buffer smaller in case it ended up large after probing */
486
    if (s->buffer_size > max_buffer_size) {
487
        url_setbufsize(s, max_buffer_size);
488

    
489
        s->checksum_ptr = dst = s->buffer;
490
        len = s->buffer_size;
491
    }
492

    
493
    if(s->read_packet)
494
        len = s->read_packet(s->opaque, dst, len);
495
    else
496
        len = 0;
497
    if (len <= 0) {
498
        /* do not modify buffer if EOF reached so that a seek back can
499
           be done without rereading data */
500
        s->eof_reached = 1;
501
        if(len<0)
502
            s->error= len;
503
    } else {
504
        s->pos += len;
505
        s->buf_ptr = dst;
506
        s->buf_end = dst + len;
507
    }
508
}
509

    
510
unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
511
                                    unsigned int len)
512
{
513
    return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
514
}
515

    
516
unsigned long get_checksum(AVIOContext *s)
517
{
518
    s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
519
    s->update_checksum= NULL;
520
    return s->checksum;
521
}
522

    
523
void init_checksum(AVIOContext *s,
524
                   unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
525
                   unsigned long checksum)
526
{
527
    s->update_checksum= update_checksum;
528
    if(s->update_checksum){
529
        s->checksum= checksum;
530
        s->checksum_ptr= s->buf_ptr;
531
    }
532
}
533

    
534
/* XXX: put an inline version */
535
int avio_r8(AVIOContext *s)
536
{
537
    if (s->buf_ptr >= s->buf_end)
538
        fill_buffer(s);
539
    if (s->buf_ptr < s->buf_end)
540
        return *s->buf_ptr++;
541
    return 0;
542
}
543

    
544
int url_fgetc(AVIOContext *s)
545
{
546
    if (s->buf_ptr >= s->buf_end)
547
        fill_buffer(s);
548
    if (s->buf_ptr < s->buf_end)
549
        return *s->buf_ptr++;
550
    return URL_EOF;
551
}
552

    
553
int avio_read(AVIOContext *s, unsigned char *buf, int size)
554
{
555
    int len, size1;
556

    
557
    size1 = size;
558
    while (size > 0) {
559
        len = s->buf_end - s->buf_ptr;
560
        if (len > size)
561
            len = size;
562
        if (len == 0) {
563
            if(size > s->buffer_size && !s->update_checksum){
564
                if(s->read_packet)
565
                    len = s->read_packet(s->opaque, buf, size);
566
                if (len <= 0) {
567
                    /* do not modify buffer if EOF reached so that a seek back can
568
                    be done without rereading data */
569
                    s->eof_reached = 1;
570
                    if(len<0)
571
                        s->error= len;
572
                    break;
573
                } else {
574
                    s->pos += len;
575
                    size -= len;
576
                    buf += len;
577
                    s->buf_ptr = s->buffer;
578
                    s->buf_end = s->buffer/* + len*/;
579
                }
580
            }else{
581
                fill_buffer(s);
582
                len = s->buf_end - s->buf_ptr;
583
                if (len == 0)
584
                    break;
585
            }
586
        } else {
587
            memcpy(buf, s->buf_ptr, len);
588
            buf += len;
589
            s->buf_ptr += len;
590
            size -= len;
591
        }
592
    }
593
    if (size1 == size) {
594
        if (url_ferror(s)) return url_ferror(s);
595
        if (url_feof(s))   return AVERROR_EOF;
596
    }
597
    return size1 - size;
598
}
599

    
600
int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size)
601
{
602
    int len;
603

    
604
    if(size<0)
605
        return -1;
606

    
607
    len = s->buf_end - s->buf_ptr;
608
    if (len == 0) {
609
        fill_buffer(s);
610
        len = s->buf_end - s->buf_ptr;
611
    }
612
    if (len > size)
613
        len = size;
614
    memcpy(buf, s->buf_ptr, len);
615
    s->buf_ptr += len;
616
    if (!len) {
617
        if (url_ferror(s)) return url_ferror(s);
618
        if (url_feof(s))   return AVERROR_EOF;
619
    }
620
    return len;
621
}
622

    
623
unsigned int avio_rl16(AVIOContext *s)
624
{
625
    unsigned int val;
626
    val = avio_r8(s);
627
    val |= avio_r8(s) << 8;
628
    return val;
629
}
630

    
631
unsigned int avio_rl24(AVIOContext *s)
632
{
633
    unsigned int val;
634
    val = avio_rl16(s);
635
    val |= avio_r8(s) << 16;
636
    return val;
637
}
638

    
639
unsigned int avio_rl32(AVIOContext *s)
640
{
641
    unsigned int val;
642
    val = avio_rl16(s);
643
    val |= avio_rl16(s) << 16;
644
    return val;
645
}
646

    
647
uint64_t avio_rl64(AVIOContext *s)
648
{
649
    uint64_t val;
650
    val = (uint64_t)avio_rl32(s);
651
    val |= (uint64_t)avio_rl32(s) << 32;
652
    return val;
653
}
654

    
655
unsigned int avio_rb16(AVIOContext *s)
656
{
657
    unsigned int val;
658
    val = avio_r8(s) << 8;
659
    val |= avio_r8(s);
660
    return val;
661
}
662

    
663
unsigned int avio_rb24(AVIOContext *s)
664
{
665
    unsigned int val;
666
    val = avio_rb16(s) << 8;
667
    val |= avio_r8(s);
668
    return val;
669
}
670
unsigned int avio_rb32(AVIOContext *s)
671
{
672
    unsigned int val;
673
    val = avio_rb16(s) << 16;
674
    val |= avio_rb16(s);
675
    return val;
676
}
677

    
678
#if FF_API_OLD_AVIO
679
char *get_strz(AVIOContext *s, char *buf, int maxlen)
680
{
681
    avio_get_str(s, INT_MAX, buf, maxlen);
682
    return buf;
683
}
684
#endif
685

    
686
int ff_get_line(AVIOContext *s, char *buf, int maxlen)
687
{
688
    int i = 0;
689
    char c;
690

    
691
    do {
692
        c = avio_r8(s);
693
        if (c && i < maxlen-1)
694
            buf[i++] = c;
695
    } while (c != '\n' && c);
696

    
697
    buf[i] = 0;
698
    return i;
699
}
700

    
701
int avio_get_str(AVIOContext *s, int maxlen, char *buf, int buflen)
702
{
703
    int i;
704

    
705
    // reserve 1 byte for terminating 0
706
    buflen = FFMIN(buflen - 1, maxlen);
707
    for (i = 0; i < buflen; i++)
708
        if (!(buf[i] = avio_r8(s)))
709
            return i + 1;
710
    if (buflen)
711
        buf[i] = 0;
712
    for (; i < maxlen; i++)
713
        if (!avio_r8(s))
714
            return i + 1;
715
    return maxlen;
716
}
717

    
718
#define GET_STR16(type, read) \
719
    int avio_get_str16 ##type(AVIOContext *pb, int maxlen, char *buf, int buflen)\
720
{\
721
    char* q = buf;\
722
    int ret = 0;\
723
    while (ret + 1 < maxlen) {\
724
        uint8_t tmp;\
725
        uint32_t ch;\
726
        GET_UTF16(ch, (ret += 2) <= maxlen ? read(pb) : 0, break;)\
727
        if (!ch)\
728
            break;\
729
        PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)\
730
    }\
731
    *q = 0;\
732
    return ret;\
733
}\
734

    
735
GET_STR16(le, avio_rl16)
736
GET_STR16(be, avio_rb16)
737

    
738
#undef GET_STR16
739

    
740
uint64_t avio_rb64(AVIOContext *s)
741
{
742
    uint64_t val;
743
    val = (uint64_t)avio_rb32(s) << 32;
744
    val |= (uint64_t)avio_rb32(s);
745
    return val;
746
}
747

    
748
uint64_t ff_get_v(AVIOContext *bc){
749
    uint64_t val = 0;
750
    int tmp;
751

    
752
    do{
753
        tmp = avio_r8(bc);
754
        val= (val<<7) + (tmp&127);
755
    }while(tmp&128);
756
    return val;
757
}
758

    
759
int url_fdopen(AVIOContext **s, URLContext *h)
760
{
761
    uint8_t *buffer;
762
    int buffer_size, max_packet_size;
763

    
764
    max_packet_size = url_get_max_packet_size(h);
765
    if (max_packet_size) {
766
        buffer_size = max_packet_size; /* no need to bufferize more than one packet */
767
    } else {
768
        buffer_size = IO_BUFFER_SIZE;
769
    }
770
    buffer = av_malloc(buffer_size);
771
    if (!buffer)
772
        return AVERROR(ENOMEM);
773

    
774
    *s = av_mallocz(sizeof(AVIOContext));
775
    if(!*s) {
776
        av_free(buffer);
777
        return AVERROR(ENOMEM);
778
    }
779

    
780
    if (ffio_init_context(*s, buffer, buffer_size,
781
                      (h->flags & URL_WRONLY || h->flags & URL_RDWR), h,
782
                      url_read, url_write, url_seek) < 0) {
783
        av_free(buffer);
784
        av_freep(s);
785
        return AVERROR(EIO);
786
    }
787
    (*s)->is_streamed = h->is_streamed;
788
    (*s)->max_packet_size = max_packet_size;
789
    if(h->prot) {
790
        (*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause;
791
        (*s)->read_seek  = (int64_t (*)(void *, int, int64_t, int))h->prot->url_read_seek;
792
    }
793
    return 0;
794
}
795

    
796
int url_setbufsize(AVIOContext *s, int buf_size)
797
{
798
    uint8_t *buffer;
799
    buffer = av_malloc(buf_size);
800
    if (!buffer)
801
        return AVERROR(ENOMEM);
802

    
803
    av_free(s->buffer);
804
    s->buffer = buffer;
805
    s->buffer_size = buf_size;
806
    s->buf_ptr = buffer;
807
    url_resetbuf(s, s->write_flag ? URL_WRONLY : URL_RDONLY);
808
    return 0;
809
}
810

    
811
#if FF_API_URL_RESETBUF
812
int url_resetbuf(AVIOContext *s, int flags)
813
#else
814
static int url_resetbuf(AVIOContext *s, int flags)
815
#endif
816
{
817
#if FF_API_URL_RESETBUF
818
    if (flags & URL_RDWR)
819
        return AVERROR(EINVAL);
820
#else
821
    assert(flags == URL_WRONLY || flags == URL_RDONLY);
822
#endif
823

    
824
    if (flags & URL_WRONLY) {
825
        s->buf_end = s->buffer + s->buffer_size;
826
        s->write_flag = 1;
827
    } else {
828
        s->buf_end = s->buffer;
829
        s->write_flag = 0;
830
    }
831
    return 0;
832
}
833

    
834
int ff_rewind_with_probe_data(AVIOContext *s, unsigned char *buf, int buf_size)
835
{
836
    int64_t buffer_start;
837
    int buffer_size;
838
    int overlap, new_size, alloc_size;
839

    
840
    if (s->write_flag)
841
        return AVERROR(EINVAL);
842

    
843
    buffer_size = s->buf_end - s->buffer;
844

    
845
    /* the buffers must touch or overlap */
846
    if ((buffer_start = s->pos - buffer_size) > buf_size)
847
        return AVERROR(EINVAL);
848

    
849
    overlap = buf_size - buffer_start;
850
    new_size = buf_size + buffer_size - overlap;
851

    
852
    alloc_size = FFMAX(s->buffer_size, new_size);
853
    if (alloc_size > buf_size)
854
        if (!(buf = av_realloc(buf, alloc_size)))
855
            return AVERROR(ENOMEM);
856

    
857
    if (new_size > buf_size) {
858
        memcpy(buf + buf_size, s->buffer + overlap, buffer_size - overlap);
859
        buf_size = new_size;
860
    }
861

    
862
    av_free(s->buffer);
863
    s->buf_ptr = s->buffer = buf;
864
    s->buffer_size = alloc_size;
865
    s->pos = buf_size;
866
    s->buf_end = s->buf_ptr + buf_size;
867
    s->eof_reached = 0;
868
    s->must_flush = 0;
869

    
870
    return 0;
871
}
872

    
873
int avio_open(AVIOContext **s, const char *filename, int flags)
874
{
875
    URLContext *h;
876
    int err;
877

    
878
    err = url_open(&h, filename, flags);
879
    if (err < 0)
880
        return err;
881
    err = url_fdopen(s, h);
882
    if (err < 0) {
883
        url_close(h);
884
        return err;
885
    }
886
    return 0;
887
}
888

    
889
int avio_close(AVIOContext *s)
890
{
891
    URLContext *h = s->opaque;
892

    
893
    av_free(s->buffer);
894
    av_free(s);
895
    return url_close(h);
896
}
897

    
898
URLContext *url_fileno(AVIOContext *s)
899
{
900
    return s->opaque;
901
}
902

    
903
#if CONFIG_MUXERS
904
int url_fprintf(AVIOContext *s, const char *fmt, ...)
905
{
906
    va_list ap;
907
    char buf[4096];
908
    int ret;
909

    
910
    va_start(ap, fmt);
911
    ret = vsnprintf(buf, sizeof(buf), fmt, ap);
912
    va_end(ap);
913
    avio_write(s, buf, strlen(buf));
914
    return ret;
915
}
916
#endif //CONFIG_MUXERS
917

    
918
char *url_fgets(AVIOContext *s, char *buf, int buf_size)
919
{
920
    int c;
921
    char *q;
922

    
923
    c = url_fgetc(s);
924
    if (c == EOF)
925
        return NULL;
926
    q = buf;
927
    for(;;) {
928
        if (c == EOF || c == '\n')
929
            break;
930
        if ((q - buf) < buf_size - 1)
931
            *q++ = c;
932
        c = url_fgetc(s);
933
    }
934
    if (buf_size > 0)
935
        *q = '\0';
936
    return buf;
937
}
938

    
939
int url_fget_max_packet_size(AVIOContext *s)
940
{
941
    return s->max_packet_size;
942
}
943

    
944
int av_url_read_fpause(AVIOContext *s, int pause)
945
{
946
    if (!s->read_pause)
947
        return AVERROR(ENOSYS);
948
    return s->read_pause(s->opaque, pause);
949
}
950

    
951
int64_t av_url_read_fseek(AVIOContext *s, int stream_index,
952
                          int64_t timestamp, int flags)
953
{
954
    URLContext *h = s->opaque;
955
    int64_t ret;
956
    if (!s->read_seek)
957
        return AVERROR(ENOSYS);
958
    ret = s->read_seek(h, stream_index, timestamp, flags);
959
    if(ret >= 0) {
960
        int64_t pos;
961
        s->buf_ptr = s->buf_end; // Flush buffer
962
        pos = s->seek(h, 0, SEEK_CUR);
963
        if (pos >= 0)
964
            s->pos = pos;
965
        else if (pos != AVERROR(ENOSYS))
966
            ret = pos;
967
    }
968
    return ret;
969
}
970

    
971
/* url_open_dyn_buf and url_close_dyn_buf are used in rtp.c to send a response
972
 * back to the server even if CONFIG_MUXERS is false. */
973
#if CONFIG_MUXERS || CONFIG_NETWORK
974
/* buffer handling */
975
int url_open_buf(AVIOContext **s, uint8_t *buf, int buf_size, int flags)
976
{
977
    int ret;
978
    *s = av_mallocz(sizeof(AVIOContext));
979
    if(!*s)
980
        return AVERROR(ENOMEM);
981
    ret = ffio_init_context(*s, buf, buf_size,
982
                        (flags & URL_WRONLY || flags & URL_RDWR),
983
                        NULL, NULL, NULL, NULL);
984
    if(ret != 0)
985
        av_freep(s);
986
    return ret;
987
}
988

    
989
int url_close_buf(AVIOContext *s)
990
{
991
    put_flush_packet(s);
992
    return s->buf_ptr - s->buffer;
993
}
994

    
995
/* output in a dynamic buffer */
996

    
997
typedef struct DynBuffer {
998
    int pos, size, allocated_size;
999
    uint8_t *buffer;
1000
    int io_buffer_size;
1001
    uint8_t io_buffer[1];
1002
} DynBuffer;
1003

    
1004
static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
1005
{
1006
    DynBuffer *d = opaque;
1007
    unsigned new_size, new_allocated_size;
1008

    
1009
    /* reallocate buffer if needed */
1010
    new_size = d->pos + buf_size;
1011
    new_allocated_size = d->allocated_size;
1012
    if(new_size < d->pos || new_size > INT_MAX/2)
1013
        return -1;
1014
    while (new_size > new_allocated_size) {
1015
        if (!new_allocated_size)
1016
            new_allocated_size = new_size;
1017
        else
1018
            new_allocated_size += new_allocated_size / 2 + 1;
1019
    }
1020

    
1021
    if (new_allocated_size > d->allocated_size) {
1022
        d->buffer = av_realloc(d->buffer, new_allocated_size);
1023
        if(d->buffer == NULL)
1024
             return AVERROR(ENOMEM);
1025
        d->allocated_size = new_allocated_size;
1026
    }
1027
    memcpy(d->buffer + d->pos, buf, buf_size);
1028
    d->pos = new_size;
1029
    if (d->pos > d->size)
1030
        d->size = d->pos;
1031
    return buf_size;
1032
}
1033

    
1034
static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
1035
{
1036
    unsigned char buf1[4];
1037
    int ret;
1038

    
1039
    /* packetized write: output the header */
1040
    AV_WB32(buf1, buf_size);
1041
    ret= dyn_buf_write(opaque, buf1, 4);
1042
    if(ret < 0)
1043
        return ret;
1044

    
1045
    /* then the data */
1046
    return dyn_buf_write(opaque, buf, buf_size);
1047
}
1048

    
1049
static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
1050
{
1051
    DynBuffer *d = opaque;
1052

    
1053
    if (whence == SEEK_CUR)
1054
        offset += d->pos;
1055
    else if (whence == SEEK_END)
1056
        offset += d->size;
1057
    if (offset < 0 || offset > 0x7fffffffLL)
1058
        return -1;
1059
    d->pos = offset;
1060
    return 0;
1061
}
1062

    
1063
static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size)
1064
{
1065
    DynBuffer *d;
1066
    int ret;
1067
    unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
1068

    
1069
    if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
1070
        return -1;
1071
    d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
1072
    if (!d)
1073
        return AVERROR(ENOMEM);
1074
    *s = av_mallocz(sizeof(AVIOContext));
1075
    if(!*s) {
1076
        av_free(d);
1077
        return AVERROR(ENOMEM);
1078
    }
1079
    d->io_buffer_size = io_buffer_size;
1080
    ret = ffio_init_context(*s, d->io_buffer, io_buffer_size,
1081
                        1, d, NULL,
1082
                        max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
1083
                        max_packet_size ? NULL : dyn_buf_seek);
1084
    if (ret == 0) {
1085
        (*s)->max_packet_size = max_packet_size;
1086
    } else {
1087
        av_free(d);
1088
        av_freep(s);
1089
    }
1090
    return ret;
1091
}
1092

    
1093
int url_open_dyn_buf(AVIOContext **s)
1094
{
1095
    return url_open_dyn_buf_internal(s, 0);
1096
}
1097

    
1098
int url_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
1099
{
1100
    if (max_packet_size <= 0)
1101
        return -1;
1102
    return url_open_dyn_buf_internal(s, max_packet_size);
1103
}
1104

    
1105
int url_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
1106
{
1107
    DynBuffer *d = s->opaque;
1108
    int size;
1109
    static const char padbuf[FF_INPUT_BUFFER_PADDING_SIZE] = {0};
1110
    int padding = 0;
1111

    
1112
    /* don't attempt to pad fixed-size packet buffers */
1113
    if (!s->max_packet_size) {
1114
        avio_write(s, padbuf, sizeof(padbuf));
1115
        padding = FF_INPUT_BUFFER_PADDING_SIZE;
1116
    }
1117

    
1118
    put_flush_packet(s);
1119

    
1120
    *pbuffer = d->buffer;
1121
    size = d->size;
1122
    av_free(d);
1123
    av_free(s);
1124
    return size - padding;
1125
}
1126
#endif /* CONFIG_MUXERS || CONFIG_NETWORK */