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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

    
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
#if FF_API_OLD_AVIO
269
int url_feof(AVIOContext *s)
270
{
271
    if(!s)
272
        return 0;
273
    return s->eof_reached;
274
}
275

    
276
int url_ferror(AVIOContext *s)
277
{
278
    if(!s)
279
        return 0;
280
    return s->error;
281
}
282
#endif
283

    
284
void avio_wl32(AVIOContext *s, unsigned int val)
285
{
286
    avio_w8(s, val);
287
    avio_w8(s, val >> 8);
288
    avio_w8(s, val >> 16);
289
    avio_w8(s, val >> 24);
290
}
291

    
292
void avio_wb32(AVIOContext *s, unsigned int val)
293
{
294
    avio_w8(s, val >> 24);
295
    avio_w8(s, val >> 16);
296
    avio_w8(s, val >> 8);
297
    avio_w8(s, val);
298
}
299

    
300
#if FF_API_OLD_AVIO
301
void put_strz(AVIOContext *s, const char *str)
302
{
303
    avio_put_str(s, str);
304
}
305

    
306
#define GET(name, type) \
307
    type get_be ##name(AVIOContext *s) \
308
{\
309
    return avio_rb ##name(s);\
310
}\
311
    type get_le ##name(AVIOContext *s) \
312
{\
313
    return avio_rl ##name(s);\
314
}
315

    
316
GET(16, unsigned int)
317
GET(24, unsigned int)
318
GET(32, unsigned int)
319
GET(64, uint64_t)
320

    
321
#undef GET
322

    
323
#define PUT(name, type ) \
324
    void put_le ##name(AVIOContext *s, type val)\
325
{\
326
        avio_wl ##name(s, val);\
327
}\
328
    void put_be ##name(AVIOContext *s, type val)\
329
{\
330
        avio_wb ##name(s, val);\
331
}
332

    
333
PUT(16, unsigned int)
334
PUT(24, unsigned int)
335
PUT(32, unsigned int)
336
PUT(64, uint64_t)
337
#undef PUT
338

    
339
int get_byte(AVIOContext *s)
340
{
341
   return avio_r8(s);
342
}
343
int get_buffer(AVIOContext *s, unsigned char *buf, int size)
344
{
345
    return avio_read(s, buf, size);
346
}
347
int get_partial_buffer(AVIOContext *s, unsigned char *buf, int size)
348
{
349
    return ffio_read_partial(s, buf, size);
350
}
351
void put_byte(AVIOContext *s, int val)
352
{
353
    avio_w8(s, val);
354
}
355
void put_buffer(AVIOContext *s, const unsigned char *buf, int size)
356
{
357
    avio_write(s, buf, size);
358
}
359
void put_nbyte(AVIOContext *s, int b, int count)
360
{
361
    ffio_fill(s, b, count);
362
}
363

    
364
int url_fopen(AVIOContext **s, const char *filename, int flags)
365
{
366
    return avio_open(s, filename, flags);
367
}
368
int url_fclose(AVIOContext *s)
369
{
370
    return avio_close(s);
371
}
372
int64_t url_fseek(AVIOContext *s, int64_t offset, int whence)
373
{
374
    return avio_seek(s, offset, whence);
375
}
376
int64_t url_fsize(AVIOContext *s)
377
{
378
    return avio_size(s);
379
}
380
#endif
381

    
382
int avio_put_str(AVIOContext *s, const char *str)
383
{
384
    int len = 1;
385
    if (str) {
386
        len += strlen(str);
387
        avio_write(s, (const unsigned char *) str, len);
388
    } else
389
        avio_w8(s, 0);
390
    return len;
391
}
392

    
393
int avio_put_str16le(AVIOContext *s, const char *str)
394
{
395
    const uint8_t *q = str;
396
    int ret = 0;
397

    
398
    while (*q) {
399
        uint32_t ch;
400
        uint16_t tmp;
401

    
402
        GET_UTF8(ch, *q++, break;)
403
        PUT_UTF16(ch, tmp, avio_wl16(s, tmp);ret += 2;)
404
    }
405
    avio_wl16(s, 0);
406
    ret += 2;
407
    return ret;
408
}
409

    
410
int ff_get_v_length(uint64_t val){
411
    int i=1;
412

    
413
    while(val>>=7)
414
        i++;
415

    
416
    return i;
417
}
418

    
419
void ff_put_v(AVIOContext *bc, uint64_t val){
420
    int i= ff_get_v_length(val);
421

    
422
    while(--i>0)
423
        avio_w8(bc, 128 | (val>>(7*i)));
424

    
425
    avio_w8(bc, val&127);
426
}
427

    
428
void avio_wl64(AVIOContext *s, uint64_t val)
429
{
430
    avio_wl32(s, (uint32_t)(val & 0xffffffff));
431
    avio_wl32(s, (uint32_t)(val >> 32));
432
}
433

    
434
void avio_wb64(AVIOContext *s, uint64_t val)
435
{
436
    avio_wb32(s, (uint32_t)(val >> 32));
437
    avio_wb32(s, (uint32_t)(val & 0xffffffff));
438
}
439

    
440
void avio_wl16(AVIOContext *s, unsigned int val)
441
{
442
    avio_w8(s, val);
443
    avio_w8(s, val >> 8);
444
}
445

    
446
void avio_wb16(AVIOContext *s, unsigned int val)
447
{
448
    avio_w8(s, val >> 8);
449
    avio_w8(s, val);
450
}
451

    
452
void avio_wl24(AVIOContext *s, unsigned int val)
453
{
454
    avio_wl16(s, val & 0xffff);
455
    avio_w8(s, val >> 16);
456
}
457

    
458
void avio_wb24(AVIOContext *s, unsigned int val)
459
{
460
    avio_wb16(s, val >> 8);
461
    avio_w8(s, val);
462
}
463

    
464
#if FF_API_OLD_AVIO
465
void put_tag(AVIOContext *s, const char *tag)
466
{
467
    while (*tag) {
468
        avio_w8(s, *tag++);
469
    }
470
}
471
#endif
472

    
473
/* Input stream */
474

    
475
static void fill_buffer(AVIOContext *s)
476
{
477
    uint8_t *dst= !s->max_packet_size && s->buf_end - s->buffer < s->buffer_size ? s->buf_end : s->buffer;
478
    int len= s->buffer_size - (dst - s->buffer);
479
    int max_buffer_size = s->max_packet_size ? s->max_packet_size : IO_BUFFER_SIZE;
480

    
481
    /* no need to do anything if EOF already reached */
482
    if (s->eof_reached)
483
        return;
484

    
485
    if(s->update_checksum && dst == s->buffer){
486
        if(s->buf_end > s->checksum_ptr)
487
            s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr);
488
        s->checksum_ptr= s->buffer;
489
    }
490

    
491
    /* make buffer smaller in case it ended up large after probing */
492
    if (s->buffer_size > max_buffer_size) {
493
        url_setbufsize(s, max_buffer_size);
494

    
495
        s->checksum_ptr = dst = s->buffer;
496
        len = s->buffer_size;
497
    }
498

    
499
    if(s->read_packet)
500
        len = s->read_packet(s->opaque, dst, len);
501
    else
502
        len = 0;
503
    if (len <= 0) {
504
        /* do not modify buffer if EOF reached so that a seek back can
505
           be done without rereading data */
506
        s->eof_reached = 1;
507
        if(len<0)
508
            s->error= len;
509
    } else {
510
        s->pos += len;
511
        s->buf_ptr = dst;
512
        s->buf_end = dst + len;
513
    }
514
}
515

    
516
unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
517
                                    unsigned int len)
518
{
519
    return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
520
}
521

    
522
unsigned long get_checksum(AVIOContext *s)
523
{
524
    s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
525
    s->update_checksum= NULL;
526
    return s->checksum;
527
}
528

    
529
void init_checksum(AVIOContext *s,
530
                   unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
531
                   unsigned long checksum)
532
{
533
    s->update_checksum= update_checksum;
534
    if(s->update_checksum){
535
        s->checksum= checksum;
536
        s->checksum_ptr= s->buf_ptr;
537
    }
538
}
539

    
540
/* XXX: put an inline version */
541
int avio_r8(AVIOContext *s)
542
{
543
    if (s->buf_ptr >= s->buf_end)
544
        fill_buffer(s);
545
    if (s->buf_ptr < s->buf_end)
546
        return *s->buf_ptr++;
547
    return 0;
548
}
549

    
550
#if FF_API_OLD_AVIO
551
int url_fgetc(AVIOContext *s)
552
{
553
    if (s->buf_ptr >= s->buf_end)
554
        fill_buffer(s);
555
    if (s->buf_ptr < s->buf_end)
556
        return *s->buf_ptr++;
557
    return URL_EOF;
558
}
559
#endif
560

    
561
int avio_read(AVIOContext *s, unsigned char *buf, int size)
562
{
563
    int len, size1;
564

    
565
    size1 = size;
566
    while (size > 0) {
567
        len = s->buf_end - s->buf_ptr;
568
        if (len > size)
569
            len = size;
570
        if (len == 0) {
571
            if(size > s->buffer_size && !s->update_checksum){
572
                if(s->read_packet)
573
                    len = s->read_packet(s->opaque, buf, size);
574
                if (len <= 0) {
575
                    /* do not modify buffer if EOF reached so that a seek back can
576
                    be done without rereading data */
577
                    s->eof_reached = 1;
578
                    if(len<0)
579
                        s->error= len;
580
                    break;
581
                } else {
582
                    s->pos += len;
583
                    size -= len;
584
                    buf += len;
585
                    s->buf_ptr = s->buffer;
586
                    s->buf_end = s->buffer/* + len*/;
587
                }
588
            }else{
589
                fill_buffer(s);
590
                len = s->buf_end - s->buf_ptr;
591
                if (len == 0)
592
                    break;
593
            }
594
        } else {
595
            memcpy(buf, s->buf_ptr, len);
596
            buf += len;
597
            s->buf_ptr += len;
598
            size -= len;
599
        }
600
    }
601
    if (size1 == size) {
602
        if (s->error)         return s->error;
603
        if (s->eof_reached)   return AVERROR_EOF;
604
    }
605
    return size1 - size;
606
}
607

    
608
int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size)
609
{
610
    int len;
611

    
612
    if(size<0)
613
        return -1;
614

    
615
    len = s->buf_end - s->buf_ptr;
616
    if (len == 0) {
617
        fill_buffer(s);
618
        len = s->buf_end - s->buf_ptr;
619
    }
620
    if (len > size)
621
        len = size;
622
    memcpy(buf, s->buf_ptr, len);
623
    s->buf_ptr += len;
624
    if (!len) {
625
        if (s->error)         return s->error;
626
        if (s->eof_reached)   return AVERROR_EOF;
627
    }
628
    return len;
629
}
630

    
631
unsigned int avio_rl16(AVIOContext *s)
632
{
633
    unsigned int val;
634
    val = avio_r8(s);
635
    val |= avio_r8(s) << 8;
636
    return val;
637
}
638

    
639
unsigned int avio_rl24(AVIOContext *s)
640
{
641
    unsigned int val;
642
    val = avio_rl16(s);
643
    val |= avio_r8(s) << 16;
644
    return val;
645
}
646

    
647
unsigned int avio_rl32(AVIOContext *s)
648
{
649
    unsigned int val;
650
    val = avio_rl16(s);
651
    val |= avio_rl16(s) << 16;
652
    return val;
653
}
654

    
655
uint64_t avio_rl64(AVIOContext *s)
656
{
657
    uint64_t val;
658
    val = (uint64_t)avio_rl32(s);
659
    val |= (uint64_t)avio_rl32(s) << 32;
660
    return val;
661
}
662

    
663
unsigned int avio_rb16(AVIOContext *s)
664
{
665
    unsigned int val;
666
    val = avio_r8(s) << 8;
667
    val |= avio_r8(s);
668
    return val;
669
}
670

    
671
unsigned int avio_rb24(AVIOContext *s)
672
{
673
    unsigned int val;
674
    val = avio_rb16(s) << 8;
675
    val |= avio_r8(s);
676
    return val;
677
}
678
unsigned int avio_rb32(AVIOContext *s)
679
{
680
    unsigned int val;
681
    val = avio_rb16(s) << 16;
682
    val |= avio_rb16(s);
683
    return val;
684
}
685

    
686
#if FF_API_OLD_AVIO
687
char *get_strz(AVIOContext *s, char *buf, int maxlen)
688
{
689
    avio_get_str(s, INT_MAX, buf, maxlen);
690
    return buf;
691
}
692
#endif
693

    
694
int ff_get_line(AVIOContext *s, char *buf, int maxlen)
695
{
696
    int i = 0;
697
    char c;
698

    
699
    do {
700
        c = avio_r8(s);
701
        if (c && i < maxlen-1)
702
            buf[i++] = c;
703
    } while (c != '\n' && c);
704

    
705
    buf[i] = 0;
706
    return i;
707
}
708

    
709
int avio_get_str(AVIOContext *s, int maxlen, char *buf, int buflen)
710
{
711
    int i;
712

    
713
    // reserve 1 byte for terminating 0
714
    buflen = FFMIN(buflen - 1, maxlen);
715
    for (i = 0; i < buflen; i++)
716
        if (!(buf[i] = avio_r8(s)))
717
            return i + 1;
718
    if (buflen)
719
        buf[i] = 0;
720
    for (; i < maxlen; i++)
721
        if (!avio_r8(s))
722
            return i + 1;
723
    return maxlen;
724
}
725

    
726
#define GET_STR16(type, read) \
727
    int avio_get_str16 ##type(AVIOContext *pb, int maxlen, char *buf, int buflen)\
728
{\
729
    char* q = buf;\
730
    int ret = 0;\
731
    while (ret + 1 < maxlen) {\
732
        uint8_t tmp;\
733
        uint32_t ch;\
734
        GET_UTF16(ch, (ret += 2) <= maxlen ? read(pb) : 0, break;)\
735
        if (!ch)\
736
            break;\
737
        PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)\
738
    }\
739
    *q = 0;\
740
    return ret;\
741
}\
742

    
743
GET_STR16(le, avio_rl16)
744
GET_STR16(be, avio_rb16)
745

    
746
#undef GET_STR16
747

    
748
uint64_t avio_rb64(AVIOContext *s)
749
{
750
    uint64_t val;
751
    val = (uint64_t)avio_rb32(s) << 32;
752
    val |= (uint64_t)avio_rb32(s);
753
    return val;
754
}
755

    
756
uint64_t ffio_read_varlen(AVIOContext *bc){
757
    uint64_t val = 0;
758
    int tmp;
759

    
760
    do{
761
        tmp = avio_r8(bc);
762
        val= (val<<7) + (tmp&127);
763
    }while(tmp&128);
764
    return val;
765
}
766

    
767
int url_fdopen(AVIOContext **s, URLContext *h)
768
{
769
    uint8_t *buffer;
770
    int buffer_size, max_packet_size;
771

    
772
    max_packet_size = url_get_max_packet_size(h);
773
    if (max_packet_size) {
774
        buffer_size = max_packet_size; /* no need to bufferize more than one packet */
775
    } else {
776
        buffer_size = IO_BUFFER_SIZE;
777
    }
778
    buffer = av_malloc(buffer_size);
779
    if (!buffer)
780
        return AVERROR(ENOMEM);
781

    
782
    *s = av_mallocz(sizeof(AVIOContext));
783
    if(!*s) {
784
        av_free(buffer);
785
        return AVERROR(ENOMEM);
786
    }
787

    
788
    if (ffio_init_context(*s, buffer, buffer_size,
789
                      (h->flags & URL_WRONLY || h->flags & URL_RDWR), h,
790
                      url_read, url_write, url_seek) < 0) {
791
        av_free(buffer);
792
        av_freep(s);
793
        return AVERROR(EIO);
794
    }
795
    (*s)->is_streamed = h->is_streamed;
796
    (*s)->max_packet_size = max_packet_size;
797
    if(h->prot) {
798
        (*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause;
799
        (*s)->read_seek  = (int64_t (*)(void *, int, int64_t, int))h->prot->url_read_seek;
800
    }
801
    return 0;
802
}
803

    
804
int url_setbufsize(AVIOContext *s, int buf_size)
805
{
806
    uint8_t *buffer;
807
    buffer = av_malloc(buf_size);
808
    if (!buffer)
809
        return AVERROR(ENOMEM);
810

    
811
    av_free(s->buffer);
812
    s->buffer = buffer;
813
    s->buffer_size = buf_size;
814
    s->buf_ptr = buffer;
815
    url_resetbuf(s, s->write_flag ? URL_WRONLY : URL_RDONLY);
816
    return 0;
817
}
818

    
819
#if FF_API_URL_RESETBUF
820
int url_resetbuf(AVIOContext *s, int flags)
821
#else
822
static int url_resetbuf(AVIOContext *s, int flags)
823
#endif
824
{
825
#if FF_API_URL_RESETBUF
826
    if (flags & URL_RDWR)
827
        return AVERROR(EINVAL);
828
#else
829
    assert(flags == URL_WRONLY || flags == URL_RDONLY);
830
#endif
831

    
832
    if (flags & URL_WRONLY) {
833
        s->buf_end = s->buffer + s->buffer_size;
834
        s->write_flag = 1;
835
    } else {
836
        s->buf_end = s->buffer;
837
        s->write_flag = 0;
838
    }
839
    return 0;
840
}
841

    
842
int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char *buf, int buf_size)
843
{
844
    int64_t buffer_start;
845
    int buffer_size;
846
    int overlap, new_size, alloc_size;
847

    
848
    if (s->write_flag)
849
        return AVERROR(EINVAL);
850

    
851
    buffer_size = s->buf_end - s->buffer;
852

    
853
    /* the buffers must touch or overlap */
854
    if ((buffer_start = s->pos - buffer_size) > buf_size)
855
        return AVERROR(EINVAL);
856

    
857
    overlap = buf_size - buffer_start;
858
    new_size = buf_size + buffer_size - overlap;
859

    
860
    alloc_size = FFMAX(s->buffer_size, new_size);
861
    if (alloc_size > buf_size)
862
        if (!(buf = av_realloc(buf, alloc_size)))
863
            return AVERROR(ENOMEM);
864

    
865
    if (new_size > buf_size) {
866
        memcpy(buf + buf_size, s->buffer + overlap, buffer_size - overlap);
867
        buf_size = new_size;
868
    }
869

    
870
    av_free(s->buffer);
871
    s->buf_ptr = s->buffer = buf;
872
    s->buffer_size = alloc_size;
873
    s->pos = buf_size;
874
    s->buf_end = s->buf_ptr + buf_size;
875
    s->eof_reached = 0;
876
    s->must_flush = 0;
877

    
878
    return 0;
879
}
880

    
881
int avio_open(AVIOContext **s, const char *filename, int flags)
882
{
883
    URLContext *h;
884
    int err;
885

    
886
    err = url_open(&h, filename, flags);
887
    if (err < 0)
888
        return err;
889
    err = url_fdopen(s, h);
890
    if (err < 0) {
891
        url_close(h);
892
        return err;
893
    }
894
    return 0;
895
}
896

    
897
int avio_close(AVIOContext *s)
898
{
899
    URLContext *h = s->opaque;
900

    
901
    av_free(s->buffer);
902
    av_free(s);
903
    return url_close(h);
904
}
905

    
906
URLContext *url_fileno(AVIOContext *s)
907
{
908
    return s->opaque;
909
}
910

    
911
#if CONFIG_MUXERS
912
int url_fprintf(AVIOContext *s, const char *fmt, ...)
913
{
914
    va_list ap;
915
    char buf[4096];
916
    int ret;
917

    
918
    va_start(ap, fmt);
919
    ret = vsnprintf(buf, sizeof(buf), fmt, ap);
920
    va_end(ap);
921
    avio_write(s, buf, strlen(buf));
922
    return ret;
923
}
924
#endif //CONFIG_MUXERS
925

    
926
#if FF_API_OLD_AVIO
927
char *url_fgets(AVIOContext *s, char *buf, int buf_size)
928
{
929
    int c;
930
    char *q;
931

    
932
    c = avio_r8(s);
933
    if (s->eof_reached)
934
        return NULL;
935
    q = buf;
936
    for(;;) {
937
        if (s->eof_reached || c == '\n')
938
            break;
939
        if ((q - buf) < buf_size - 1)
940
            *q++ = c;
941
        c = avio_r8(s);
942
    }
943
    if (buf_size > 0)
944
        *q = '\0';
945
    return buf;
946
}
947

    
948
int url_fget_max_packet_size(AVIOContext *s)
949
{
950
    return s->max_packet_size;
951
}
952
#endif
953

    
954
int av_url_read_fpause(AVIOContext *s, int pause)
955
{
956
    if (!s->read_pause)
957
        return AVERROR(ENOSYS);
958
    return s->read_pause(s->opaque, pause);
959
}
960

    
961
int64_t av_url_read_fseek(AVIOContext *s, int stream_index,
962
                          int64_t timestamp, int flags)
963
{
964
    URLContext *h = s->opaque;
965
    int64_t ret;
966
    if (!s->read_seek)
967
        return AVERROR(ENOSYS);
968
    ret = s->read_seek(h, stream_index, timestamp, flags);
969
    if(ret >= 0) {
970
        int64_t pos;
971
        s->buf_ptr = s->buf_end; // Flush buffer
972
        pos = s->seek(h, 0, SEEK_CUR);
973
        if (pos >= 0)
974
            s->pos = pos;
975
        else if (pos != AVERROR(ENOSYS))
976
            ret = pos;
977
    }
978
    return ret;
979
}
980

    
981
/* url_open_dyn_buf and url_close_dyn_buf are used in rtp.c to send a response
982
 * back to the server even if CONFIG_MUXERS is false. */
983
#if CONFIG_MUXERS || CONFIG_NETWORK
984
/* buffer handling */
985
int url_open_buf(AVIOContext **s, uint8_t *buf, int buf_size, int flags)
986
{
987
    int ret;
988
    *s = av_mallocz(sizeof(AVIOContext));
989
    if(!*s)
990
        return AVERROR(ENOMEM);
991
    ret = ffio_init_context(*s, buf, buf_size,
992
                        (flags & URL_WRONLY || flags & URL_RDWR),
993
                        NULL, NULL, NULL, NULL);
994
    if(ret != 0)
995
        av_freep(s);
996
    return ret;
997
}
998

    
999
int url_close_buf(AVIOContext *s)
1000
{
1001
    put_flush_packet(s);
1002
    return s->buf_ptr - s->buffer;
1003
}
1004

    
1005
/* output in a dynamic buffer */
1006

    
1007
typedef struct DynBuffer {
1008
    int pos, size, allocated_size;
1009
    uint8_t *buffer;
1010
    int io_buffer_size;
1011
    uint8_t io_buffer[1];
1012
} DynBuffer;
1013

    
1014
static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
1015
{
1016
    DynBuffer *d = opaque;
1017
    unsigned new_size, new_allocated_size;
1018

    
1019
    /* reallocate buffer if needed */
1020
    new_size = d->pos + buf_size;
1021
    new_allocated_size = d->allocated_size;
1022
    if(new_size < d->pos || new_size > INT_MAX/2)
1023
        return -1;
1024
    while (new_size > new_allocated_size) {
1025
        if (!new_allocated_size)
1026
            new_allocated_size = new_size;
1027
        else
1028
            new_allocated_size += new_allocated_size / 2 + 1;
1029
    }
1030

    
1031
    if (new_allocated_size > d->allocated_size) {
1032
        d->buffer = av_realloc(d->buffer, new_allocated_size);
1033
        if(d->buffer == NULL)
1034
             return AVERROR(ENOMEM);
1035
        d->allocated_size = new_allocated_size;
1036
    }
1037
    memcpy(d->buffer + d->pos, buf, buf_size);
1038
    d->pos = new_size;
1039
    if (d->pos > d->size)
1040
        d->size = d->pos;
1041
    return buf_size;
1042
}
1043

    
1044
static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
1045
{
1046
    unsigned char buf1[4];
1047
    int ret;
1048

    
1049
    /* packetized write: output the header */
1050
    AV_WB32(buf1, buf_size);
1051
    ret= dyn_buf_write(opaque, buf1, 4);
1052
    if(ret < 0)
1053
        return ret;
1054

    
1055
    /* then the data */
1056
    return dyn_buf_write(opaque, buf, buf_size);
1057
}
1058

    
1059
static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
1060
{
1061
    DynBuffer *d = opaque;
1062

    
1063
    if (whence == SEEK_CUR)
1064
        offset += d->pos;
1065
    else if (whence == SEEK_END)
1066
        offset += d->size;
1067
    if (offset < 0 || offset > 0x7fffffffLL)
1068
        return -1;
1069
    d->pos = offset;
1070
    return 0;
1071
}
1072

    
1073
static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size)
1074
{
1075
    DynBuffer *d;
1076
    int ret;
1077
    unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
1078

    
1079
    if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
1080
        return -1;
1081
    d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
1082
    if (!d)
1083
        return AVERROR(ENOMEM);
1084
    *s = av_mallocz(sizeof(AVIOContext));
1085
    if(!*s) {
1086
        av_free(d);
1087
        return AVERROR(ENOMEM);
1088
    }
1089
    d->io_buffer_size = io_buffer_size;
1090
    ret = ffio_init_context(*s, d->io_buffer, io_buffer_size,
1091
                        1, d, NULL,
1092
                        max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
1093
                        max_packet_size ? NULL : dyn_buf_seek);
1094
    if (ret == 0) {
1095
        (*s)->max_packet_size = max_packet_size;
1096
    } else {
1097
        av_free(d);
1098
        av_freep(s);
1099
    }
1100
    return ret;
1101
}
1102

    
1103
int url_open_dyn_buf(AVIOContext **s)
1104
{
1105
    return url_open_dyn_buf_internal(s, 0);
1106
}
1107

    
1108
int url_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
1109
{
1110
    if (max_packet_size <= 0)
1111
        return -1;
1112
    return url_open_dyn_buf_internal(s, max_packet_size);
1113
}
1114

    
1115
int url_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
1116
{
1117
    DynBuffer *d = s->opaque;
1118
    int size;
1119
    static const char padbuf[FF_INPUT_BUFFER_PADDING_SIZE] = {0};
1120
    int padding = 0;
1121

    
1122
    /* don't attempt to pad fixed-size packet buffers */
1123
    if (!s->max_packet_size) {
1124
        avio_write(s, padbuf, sizeof(padbuf));
1125
        padding = FF_INPUT_BUFFER_PADDING_SIZE;
1126
    }
1127

    
1128
    put_flush_packet(s);
1129

    
1130
    *pbuffer = d->buffer;
1131
    size = d->size;
1132
    av_free(d);
1133
    av_free(s);
1134
    return size - padding;
1135
}
1136
#endif /* CONFIG_MUXERS || CONFIG_NETWORK */