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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
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 * 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,
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                  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

    
243
int64_t url_ftell(AVIOContext *s)
244
{
245
    return avio_seek(s, 0, SEEK_CUR);
246
}
247
#endif
248

    
249
int64_t avio_size(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
int64_t url_fsize(AVIOContext *s)
375
{
376
    return avio_size(s);
377
}
378
#endif
379

    
380
int avio_put_str(AVIOContext *s, const char *str)
381
{
382
    int len = 1;
383
    if (str) {
384
        len += strlen(str);
385
        avio_write(s, (const unsigned char *) str, len);
386
    } else
387
        avio_w8(s, 0);
388
    return len;
389
}
390

    
391
int avio_put_str16le(AVIOContext *s, const char *str)
392
{
393
    const uint8_t *q = str;
394
    int ret = 0;
395

    
396
    while (*q) {
397
        uint32_t ch;
398
        uint16_t tmp;
399

    
400
        GET_UTF8(ch, *q++, break;)
401
        PUT_UTF16(ch, tmp, avio_wl16(s, tmp);ret += 2;)
402
    }
403
    avio_wl16(s, 0);
404
    ret += 2;
405
    return ret;
406
}
407

    
408
int ff_get_v_length(uint64_t val){
409
    int i=1;
410

    
411
    while(val>>=7)
412
        i++;
413

    
414
    return i;
415
}
416

    
417
void ff_put_v(AVIOContext *bc, uint64_t val){
418
    int i= ff_get_v_length(val);
419

    
420
    while(--i>0)
421
        avio_w8(bc, 128 | (val>>(7*i)));
422

    
423
    avio_w8(bc, val&127);
424
}
425

    
426
void avio_wl64(AVIOContext *s, uint64_t val)
427
{
428
    avio_wl32(s, (uint32_t)(val & 0xffffffff));
429
    avio_wl32(s, (uint32_t)(val >> 32));
430
}
431

    
432
void avio_wb64(AVIOContext *s, uint64_t val)
433
{
434
    avio_wb32(s, (uint32_t)(val >> 32));
435
    avio_wb32(s, (uint32_t)(val & 0xffffffff));
436
}
437

    
438
void avio_wl16(AVIOContext *s, unsigned int val)
439
{
440
    avio_w8(s, val);
441
    avio_w8(s, val >> 8);
442
}
443

    
444
void avio_wb16(AVIOContext *s, unsigned int val)
445
{
446
    avio_w8(s, val >> 8);
447
    avio_w8(s, val);
448
}
449

    
450
void avio_wl24(AVIOContext *s, unsigned int val)
451
{
452
    avio_wl16(s, val & 0xffff);
453
    avio_w8(s, val >> 16);
454
}
455

    
456
void avio_wb24(AVIOContext *s, unsigned int val)
457
{
458
    avio_wb16(s, val >> 8);
459
    avio_w8(s, val);
460
}
461

    
462
#if FF_API_OLD_AVIO
463
void put_tag(AVIOContext *s, const char *tag)
464
{
465
    while (*tag) {
466
        avio_w8(s, *tag++);
467
    }
468
}
469
#endif
470

    
471
/* Input stream */
472

    
473
static void fill_buffer(AVIOContext *s)
474
{
475
    uint8_t *dst= !s->max_packet_size && s->buf_end - s->buffer < s->buffer_size ? s->buf_end : s->buffer;
476
    int len= s->buffer_size - (dst - s->buffer);
477
    int max_buffer_size = s->max_packet_size ? s->max_packet_size : IO_BUFFER_SIZE;
478

    
479
    /* no need to do anything if EOF already reached */
480
    if (s->eof_reached)
481
        return;
482

    
483
    if(s->update_checksum && dst == s->buffer){
484
        if(s->buf_end > s->checksum_ptr)
485
            s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr);
486
        s->checksum_ptr= s->buffer;
487
    }
488

    
489
    /* make buffer smaller in case it ended up large after probing */
490
    if (s->buffer_size > max_buffer_size) {
491
        url_setbufsize(s, max_buffer_size);
492

    
493
        s->checksum_ptr = dst = s->buffer;
494
        len = s->buffer_size;
495
    }
496

    
497
    if(s->read_packet)
498
        len = s->read_packet(s->opaque, dst, len);
499
    else
500
        len = 0;
501
    if (len <= 0) {
502
        /* do not modify buffer if EOF reached so that a seek back can
503
           be done without rereading data */
504
        s->eof_reached = 1;
505
        if(len<0)
506
            s->error= len;
507
    } else {
508
        s->pos += len;
509
        s->buf_ptr = dst;
510
        s->buf_end = dst + len;
511
    }
512
}
513

    
514
unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
515
                                    unsigned int len)
516
{
517
    return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
518
}
519

    
520
unsigned long get_checksum(AVIOContext *s)
521
{
522
    s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
523
    s->update_checksum= NULL;
524
    return s->checksum;
525
}
526

    
527
void init_checksum(AVIOContext *s,
528
                   unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
529
                   unsigned long checksum)
530
{
531
    s->update_checksum= update_checksum;
532
    if(s->update_checksum){
533
        s->checksum= checksum;
534
        s->checksum_ptr= s->buf_ptr;
535
    }
536
}
537

    
538
/* XXX: put an inline version */
539
int avio_r8(AVIOContext *s)
540
{
541
    if (s->buf_ptr >= s->buf_end)
542
        fill_buffer(s);
543
    if (s->buf_ptr < s->buf_end)
544
        return *s->buf_ptr++;
545
    return 0;
546
}
547

    
548
#if FF_API_OLD_AVIO
549
int url_fgetc(AVIOContext *s)
550
{
551
    if (s->buf_ptr >= s->buf_end)
552
        fill_buffer(s);
553
    if (s->buf_ptr < s->buf_end)
554
        return *s->buf_ptr++;
555
    return URL_EOF;
556
}
557
#endif
558

    
559
int avio_read(AVIOContext *s, unsigned char *buf, int size)
560
{
561
    int len, size1;
562

    
563
    size1 = size;
564
    while (size > 0) {
565
        len = s->buf_end - s->buf_ptr;
566
        if (len > size)
567
            len = size;
568
        if (len == 0) {
569
            if(size > s->buffer_size && !s->update_checksum){
570
                if(s->read_packet)
571
                    len = s->read_packet(s->opaque, buf, size);
572
                if (len <= 0) {
573
                    /* do not modify buffer if EOF reached so that a seek back can
574
                    be done without rereading data */
575
                    s->eof_reached = 1;
576
                    if(len<0)
577
                        s->error= len;
578
                    break;
579
                } else {
580
                    s->pos += len;
581
                    size -= len;
582
                    buf += len;
583
                    s->buf_ptr = s->buffer;
584
                    s->buf_end = s->buffer/* + len*/;
585
                }
586
            }else{
587
                fill_buffer(s);
588
                len = s->buf_end - s->buf_ptr;
589
                if (len == 0)
590
                    break;
591
            }
592
        } else {
593
            memcpy(buf, s->buf_ptr, len);
594
            buf += len;
595
            s->buf_ptr += len;
596
            size -= len;
597
        }
598
    }
599
    if (size1 == size) {
600
        if (url_ferror(s)) return url_ferror(s);
601
        if (url_feof(s))   return AVERROR_EOF;
602
    }
603
    return size1 - size;
604
}
605

    
606
int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size)
607
{
608
    int len;
609

    
610
    if(size<0)
611
        return -1;
612

    
613
    len = s->buf_end - s->buf_ptr;
614
    if (len == 0) {
615
        fill_buffer(s);
616
        len = s->buf_end - s->buf_ptr;
617
    }
618
    if (len > size)
619
        len = size;
620
    memcpy(buf, s->buf_ptr, len);
621
    s->buf_ptr += len;
622
    if (!len) {
623
        if (url_ferror(s)) return url_ferror(s);
624
        if (url_feof(s))   return AVERROR_EOF;
625
    }
626
    return len;
627
}
628

    
629
unsigned int avio_rl16(AVIOContext *s)
630
{
631
    unsigned int val;
632
    val = avio_r8(s);
633
    val |= avio_r8(s) << 8;
634
    return val;
635
}
636

    
637
unsigned int avio_rl24(AVIOContext *s)
638
{
639
    unsigned int val;
640
    val = avio_rl16(s);
641
    val |= avio_r8(s) << 16;
642
    return val;
643
}
644

    
645
unsigned int avio_rl32(AVIOContext *s)
646
{
647
    unsigned int val;
648
    val = avio_rl16(s);
649
    val |= avio_rl16(s) << 16;
650
    return val;
651
}
652

    
653
uint64_t avio_rl64(AVIOContext *s)
654
{
655
    uint64_t val;
656
    val = (uint64_t)avio_rl32(s);
657
    val |= (uint64_t)avio_rl32(s) << 32;
658
    return val;
659
}
660

    
661
unsigned int avio_rb16(AVIOContext *s)
662
{
663
    unsigned int val;
664
    val = avio_r8(s) << 8;
665
    val |= avio_r8(s);
666
    return val;
667
}
668

    
669
unsigned int avio_rb24(AVIOContext *s)
670
{
671
    unsigned int val;
672
    val = avio_rb16(s) << 8;
673
    val |= avio_r8(s);
674
    return val;
675
}
676
unsigned int avio_rb32(AVIOContext *s)
677
{
678
    unsigned int val;
679
    val = avio_rb16(s) << 16;
680
    val |= avio_rb16(s);
681
    return val;
682
}
683

    
684
#if FF_API_OLD_AVIO
685
char *get_strz(AVIOContext *s, char *buf, int maxlen)
686
{
687
    avio_get_str(s, INT_MAX, buf, maxlen);
688
    return buf;
689
}
690
#endif
691

    
692
int ff_get_line(AVIOContext *s, char *buf, int maxlen)
693
{
694
    int i = 0;
695
    char c;
696

    
697
    do {
698
        c = avio_r8(s);
699
        if (c && i < maxlen-1)
700
            buf[i++] = c;
701
    } while (c != '\n' && c);
702

    
703
    buf[i] = 0;
704
    return i;
705
}
706

    
707
int avio_get_str(AVIOContext *s, int maxlen, char *buf, int buflen)
708
{
709
    int i;
710

    
711
    // reserve 1 byte for terminating 0
712
    buflen = FFMIN(buflen - 1, maxlen);
713
    for (i = 0; i < buflen; i++)
714
        if (!(buf[i] = avio_r8(s)))
715
            return i + 1;
716
    if (buflen)
717
        buf[i] = 0;
718
    for (; i < maxlen; i++)
719
        if (!avio_r8(s))
720
            return i + 1;
721
    return maxlen;
722
}
723

    
724
#define GET_STR16(type, read) \
725
    int avio_get_str16 ##type(AVIOContext *pb, int maxlen, char *buf, int buflen)\
726
{\
727
    char* q = buf;\
728
    int ret = 0;\
729
    while (ret + 1 < maxlen) {\
730
        uint8_t tmp;\
731
        uint32_t ch;\
732
        GET_UTF16(ch, (ret += 2) <= maxlen ? read(pb) : 0, break;)\
733
        if (!ch)\
734
            break;\
735
        PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)\
736
    }\
737
    *q = 0;\
738
    return ret;\
739
}\
740

    
741
GET_STR16(le, avio_rl16)
742
GET_STR16(be, avio_rb16)
743

    
744
#undef GET_STR16
745

    
746
uint64_t avio_rb64(AVIOContext *s)
747
{
748
    uint64_t val;
749
    val = (uint64_t)avio_rb32(s) << 32;
750
    val |= (uint64_t)avio_rb32(s);
751
    return val;
752
}
753

    
754
uint64_t ff_get_v(AVIOContext *bc){
755
    uint64_t val = 0;
756
    int tmp;
757

    
758
    do{
759
        tmp = avio_r8(bc);
760
        val= (val<<7) + (tmp&127);
761
    }while(tmp&128);
762
    return val;
763
}
764

    
765
int url_fdopen(AVIOContext **s, URLContext *h)
766
{
767
    uint8_t *buffer;
768
    int buffer_size, max_packet_size;
769

    
770
    max_packet_size = url_get_max_packet_size(h);
771
    if (max_packet_size) {
772
        buffer_size = max_packet_size; /* no need to bufferize more than one packet */
773
    } else {
774
        buffer_size = IO_BUFFER_SIZE;
775
    }
776
    buffer = av_malloc(buffer_size);
777
    if (!buffer)
778
        return AVERROR(ENOMEM);
779

    
780
    *s = av_mallocz(sizeof(AVIOContext));
781
    if(!*s) {
782
        av_free(buffer);
783
        return AVERROR(ENOMEM);
784
    }
785

    
786
    if (ffio_init_context(*s, buffer, buffer_size,
787
                      (h->flags & URL_WRONLY || h->flags & URL_RDWR), h,
788
                      url_read, url_write, url_seek) < 0) {
789
        av_free(buffer);
790
        av_freep(s);
791
        return AVERROR(EIO);
792
    }
793
    (*s)->is_streamed = h->is_streamed;
794
    (*s)->max_packet_size = max_packet_size;
795
    if(h->prot) {
796
        (*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause;
797
        (*s)->read_seek  = (int64_t (*)(void *, int, int64_t, int))h->prot->url_read_seek;
798
    }
799
    return 0;
800
}
801

    
802
int url_setbufsize(AVIOContext *s, int buf_size)
803
{
804
    uint8_t *buffer;
805
    buffer = av_malloc(buf_size);
806
    if (!buffer)
807
        return AVERROR(ENOMEM);
808

    
809
    av_free(s->buffer);
810
    s->buffer = buffer;
811
    s->buffer_size = buf_size;
812
    s->buf_ptr = buffer;
813
    url_resetbuf(s, s->write_flag ? URL_WRONLY : URL_RDONLY);
814
    return 0;
815
}
816

    
817
#if FF_API_URL_RESETBUF
818
int url_resetbuf(AVIOContext *s, int flags)
819
#else
820
static int url_resetbuf(AVIOContext *s, int flags)
821
#endif
822
{
823
#if FF_API_URL_RESETBUF
824
    if (flags & URL_RDWR)
825
        return AVERROR(EINVAL);
826
#else
827
    assert(flags == URL_WRONLY || flags == URL_RDONLY);
828
#endif
829

    
830
    if (flags & URL_WRONLY) {
831
        s->buf_end = s->buffer + s->buffer_size;
832
        s->write_flag = 1;
833
    } else {
834
        s->buf_end = s->buffer;
835
        s->write_flag = 0;
836
    }
837
    return 0;
838
}
839

    
840
int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char *buf, int buf_size)
841
{
842
    int64_t buffer_start;
843
    int buffer_size;
844
    int overlap, new_size, alloc_size;
845

    
846
    if (s->write_flag)
847
        return AVERROR(EINVAL);
848

    
849
    buffer_size = s->buf_end - s->buffer;
850

    
851
    /* the buffers must touch or overlap */
852
    if ((buffer_start = s->pos - buffer_size) > buf_size)
853
        return AVERROR(EINVAL);
854

    
855
    overlap = buf_size - buffer_start;
856
    new_size = buf_size + buffer_size - overlap;
857

    
858
    alloc_size = FFMAX(s->buffer_size, new_size);
859
    if (alloc_size > buf_size)
860
        if (!(buf = av_realloc(buf, alloc_size)))
861
            return AVERROR(ENOMEM);
862

    
863
    if (new_size > buf_size) {
864
        memcpy(buf + buf_size, s->buffer + overlap, buffer_size - overlap);
865
        buf_size = new_size;
866
    }
867

    
868
    av_free(s->buffer);
869
    s->buf_ptr = s->buffer = buf;
870
    s->buffer_size = alloc_size;
871
    s->pos = buf_size;
872
    s->buf_end = s->buf_ptr + buf_size;
873
    s->eof_reached = 0;
874
    s->must_flush = 0;
875

    
876
    return 0;
877
}
878

    
879
int avio_open(AVIOContext **s, const char *filename, int flags)
880
{
881
    URLContext *h;
882
    int err;
883

    
884
    err = url_open(&h, filename, flags);
885
    if (err < 0)
886
        return err;
887
    err = url_fdopen(s, h);
888
    if (err < 0) {
889
        url_close(h);
890
        return err;
891
    }
892
    return 0;
893
}
894

    
895
int avio_close(AVIOContext *s)
896
{
897
    URLContext *h = s->opaque;
898

    
899
    av_free(s->buffer);
900
    av_free(s);
901
    return url_close(h);
902
}
903

    
904
URLContext *url_fileno(AVIOContext *s)
905
{
906
    return s->opaque;
907
}
908

    
909
#if CONFIG_MUXERS
910
int url_fprintf(AVIOContext *s, const char *fmt, ...)
911
{
912
    va_list ap;
913
    char buf[4096];
914
    int ret;
915

    
916
    va_start(ap, fmt);
917
    ret = vsnprintf(buf, sizeof(buf), fmt, ap);
918
    va_end(ap);
919
    avio_write(s, buf, strlen(buf));
920
    return ret;
921
}
922
#endif //CONFIG_MUXERS
923

    
924
#if FF_API_OLD_AVIO
925
char *url_fgets(AVIOContext *s, char *buf, int buf_size)
926
{
927
    int c;
928
    char *q;
929

    
930
    c = avio_r8(s);
931
    if (url_feof(s))
932
        return NULL;
933
    q = buf;
934
    for(;;) {
935
        if (url_feof(s) || c == '\n')
936
            break;
937
        if ((q - buf) < buf_size - 1)
938
            *q++ = c;
939
        c = avio_r8(s);
940
    }
941
    if (buf_size > 0)
942
        *q = '\0';
943
    return buf;
944
}
945

    
946
int url_fget_max_packet_size(AVIOContext *s)
947
{
948
    return s->max_packet_size;
949
}
950
#endif
951

    
952
int av_url_read_fpause(AVIOContext *s, int pause)
953
{
954
    if (!s->read_pause)
955
        return AVERROR(ENOSYS);
956
    return s->read_pause(s->opaque, pause);
957
}
958

    
959
int64_t av_url_read_fseek(AVIOContext *s, int stream_index,
960
                          int64_t timestamp, int flags)
961
{
962
    URLContext *h = s->opaque;
963
    int64_t ret;
964
    if (!s->read_seek)
965
        return AVERROR(ENOSYS);
966
    ret = s->read_seek(h, stream_index, timestamp, flags);
967
    if(ret >= 0) {
968
        int64_t pos;
969
        s->buf_ptr = s->buf_end; // Flush buffer
970
        pos = s->seek(h, 0, SEEK_CUR);
971
        if (pos >= 0)
972
            s->pos = pos;
973
        else if (pos != AVERROR(ENOSYS))
974
            ret = pos;
975
    }
976
    return ret;
977
}
978

    
979
/* url_open_dyn_buf and url_close_dyn_buf are used in rtp.c to send a response
980
 * back to the server even if CONFIG_MUXERS is false. */
981
#if CONFIG_MUXERS || CONFIG_NETWORK
982
/* buffer handling */
983
int url_open_buf(AVIOContext **s, uint8_t *buf, int buf_size, int flags)
984
{
985
    int ret;
986
    *s = av_mallocz(sizeof(AVIOContext));
987
    if(!*s)
988
        return AVERROR(ENOMEM);
989
    ret = ffio_init_context(*s, buf, buf_size,
990
                        (flags & URL_WRONLY || flags & URL_RDWR),
991
                        NULL, NULL, NULL, NULL);
992
    if(ret != 0)
993
        av_freep(s);
994
    return ret;
995
}
996

    
997
int url_close_buf(AVIOContext *s)
998
{
999
    put_flush_packet(s);
1000
    return s->buf_ptr - s->buffer;
1001
}
1002

    
1003
/* output in a dynamic buffer */
1004

    
1005
typedef struct DynBuffer {
1006
    int pos, size, allocated_size;
1007
    uint8_t *buffer;
1008
    int io_buffer_size;
1009
    uint8_t io_buffer[1];
1010
} DynBuffer;
1011

    
1012
static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
1013
{
1014
    DynBuffer *d = opaque;
1015
    unsigned new_size, new_allocated_size;
1016

    
1017
    /* reallocate buffer if needed */
1018
    new_size = d->pos + buf_size;
1019
    new_allocated_size = d->allocated_size;
1020
    if(new_size < d->pos || new_size > INT_MAX/2)
1021
        return -1;
1022
    while (new_size > new_allocated_size) {
1023
        if (!new_allocated_size)
1024
            new_allocated_size = new_size;
1025
        else
1026
            new_allocated_size += new_allocated_size / 2 + 1;
1027
    }
1028

    
1029
    if (new_allocated_size > d->allocated_size) {
1030
        d->buffer = av_realloc(d->buffer, new_allocated_size);
1031
        if(d->buffer == NULL)
1032
             return AVERROR(ENOMEM);
1033
        d->allocated_size = new_allocated_size;
1034
    }
1035
    memcpy(d->buffer + d->pos, buf, buf_size);
1036
    d->pos = new_size;
1037
    if (d->pos > d->size)
1038
        d->size = d->pos;
1039
    return buf_size;
1040
}
1041

    
1042
static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
1043
{
1044
    unsigned char buf1[4];
1045
    int ret;
1046

    
1047
    /* packetized write: output the header */
1048
    AV_WB32(buf1, buf_size);
1049
    ret= dyn_buf_write(opaque, buf1, 4);
1050
    if(ret < 0)
1051
        return ret;
1052

    
1053
    /* then the data */
1054
    return dyn_buf_write(opaque, buf, buf_size);
1055
}
1056

    
1057
static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
1058
{
1059
    DynBuffer *d = opaque;
1060

    
1061
    if (whence == SEEK_CUR)
1062
        offset += d->pos;
1063
    else if (whence == SEEK_END)
1064
        offset += d->size;
1065
    if (offset < 0 || offset > 0x7fffffffLL)
1066
        return -1;
1067
    d->pos = offset;
1068
    return 0;
1069
}
1070

    
1071
static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size)
1072
{
1073
    DynBuffer *d;
1074
    int ret;
1075
    unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
1076

    
1077
    if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
1078
        return -1;
1079
    d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
1080
    if (!d)
1081
        return AVERROR(ENOMEM);
1082
    *s = av_mallocz(sizeof(AVIOContext));
1083
    if(!*s) {
1084
        av_free(d);
1085
        return AVERROR(ENOMEM);
1086
    }
1087
    d->io_buffer_size = io_buffer_size;
1088
    ret = ffio_init_context(*s, d->io_buffer, io_buffer_size,
1089
                        1, d, NULL,
1090
                        max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
1091
                        max_packet_size ? NULL : dyn_buf_seek);
1092
    if (ret == 0) {
1093
        (*s)->max_packet_size = max_packet_size;
1094
    } else {
1095
        av_free(d);
1096
        av_freep(s);
1097
    }
1098
    return ret;
1099
}
1100

    
1101
int url_open_dyn_buf(AVIOContext **s)
1102
{
1103
    return url_open_dyn_buf_internal(s, 0);
1104
}
1105

    
1106
int url_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
1107
{
1108
    if (max_packet_size <= 0)
1109
        return -1;
1110
    return url_open_dyn_buf_internal(s, max_packet_size);
1111
}
1112

    
1113
int url_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
1114
{
1115
    DynBuffer *d = s->opaque;
1116
    int size;
1117
    static const char padbuf[FF_INPUT_BUFFER_PADDING_SIZE] = {0};
1118
    int padding = 0;
1119

    
1120
    /* don't attempt to pad fixed-size packet buffers */
1121
    if (!s->max_packet_size) {
1122
        avio_write(s, padbuf, sizeof(padbuf));
1123
        padding = FF_INPUT_BUFFER_PADDING_SIZE;
1124
    }
1125

    
1126
    put_flush_packet(s);
1127

    
1128
    *pbuffer = d->buffer;
1129
    size = d->size;
1130
    av_free(d);
1131
    av_free(s);
1132
    return size - padding;
1133
}
1134
#endif /* CONFIG_MUXERS || CONFIG_NETWORK */