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

    
242
int64_t url_ftell(AVIOContext *s)
243
{
244
    return avio_seek(s, 0, SEEK_CUR);
245
}
246

    
247
int64_t url_fsize(AVIOContext *s)
248
{
249
    int64_t size;
250

    
251
    if(!s)
252
        return AVERROR(EINVAL);
253

    
254
    if (!s->seek)
255
        return AVERROR(ENOSYS);
256
    size = s->seek(s->opaque, 0, AVSEEK_SIZE);
257
    if(size<0){
258
        if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
259
            return size;
260
        size++;
261
        s->seek(s->opaque, s->pos, SEEK_SET);
262
    }
263
    return size;
264
}
265

    
266
int url_feof(AVIOContext *s)
267
{
268
    if(!s)
269
        return 0;
270
    return s->eof_reached;
271
}
272

    
273
int url_ferror(AVIOContext *s)
274
{
275
    if(!s)
276
        return 0;
277
    return s->error;
278
}
279

    
280
void avio_wl32(AVIOContext *s, unsigned int val)
281
{
282
    avio_w8(s, val);
283
    avio_w8(s, val >> 8);
284
    avio_w8(s, val >> 16);
285
    avio_w8(s, val >> 24);
286
}
287

    
288
void avio_wb32(AVIOContext *s, unsigned int val)
289
{
290
    avio_w8(s, val >> 24);
291
    avio_w8(s, val >> 16);
292
    avio_w8(s, val >> 8);
293
    avio_w8(s, val);
294
}
295

    
296
#if FF_API_OLD_AVIO
297
void put_strz(AVIOContext *s, const char *str)
298
{
299
    avio_put_str(s, str);
300
}
301

    
302
#define GET(name, type) \
303
    type get_be ##name(AVIOContext *s) \
304
{\
305
    return avio_rb ##name(s);\
306
}\
307
    type get_le ##name(AVIOContext *s) \
308
{\
309
    return avio_rl ##name(s);\
310
}
311

    
312
GET(16, unsigned int)
313
GET(24, unsigned int)
314
GET(32, unsigned int)
315
GET(64, uint64_t)
316

    
317
#undef GET
318

    
319
#define PUT(name, type ) \
320
    void put_le ##name(AVIOContext *s, type val)\
321
{\
322
        avio_wl ##name(s, val);\
323
}\
324
    void put_be ##name(AVIOContext *s, type val)\
325
{\
326
        avio_wb ##name(s, val);\
327
}
328

    
329
PUT(16, unsigned int)
330
PUT(24, unsigned int)
331
PUT(32, unsigned int)
332
PUT(64, uint64_t)
333
#undef PUT
334

    
335
int get_byte(AVIOContext *s)
336
{
337
   return avio_r8(s);
338
}
339
int get_buffer(AVIOContext *s, unsigned char *buf, int size)
340
{
341
    return avio_read(s, buf, size);
342
}
343
int get_partial_buffer(AVIOContext *s, unsigned char *buf, int size)
344
{
345
    return ffio_read_partial(s, buf, size);
346
}
347
void put_byte(AVIOContext *s, int val)
348
{
349
    avio_w8(s, val);
350
}
351
void put_buffer(AVIOContext *s, const unsigned char *buf, int size)
352
{
353
    avio_write(s, buf, size);
354
}
355
void put_nbyte(AVIOContext *s, int b, int count)
356
{
357
    ffio_fill(s, b, count);
358
}
359

    
360
int url_fopen(AVIOContext **s, const char *filename, int flags)
361
{
362
    return avio_open(s, filename, flags);
363
}
364
int url_fclose(AVIOContext *s)
365
{
366
    return avio_close(s);
367
}
368
int64_t url_fseek(AVIOContext *s, int64_t offset, int whence)
369
{
370
    return avio_seek(s, offset, whence);
371
}
372
#endif
373

    
374
int avio_put_str(AVIOContext *s, const char *str)
375
{
376
    int len = 1;
377
    if (str) {
378
        len += strlen(str);
379
        avio_write(s, (const unsigned char *) str, len);
380
    } else
381
        avio_w8(s, 0);
382
    return len;
383
}
384

    
385
int avio_put_str16le(AVIOContext *s, const char *str)
386
{
387
    const uint8_t *q = str;
388
    int ret = 0;
389

    
390
    while (*q) {
391
        uint32_t ch;
392
        uint16_t tmp;
393

    
394
        GET_UTF8(ch, *q++, break;)
395
        PUT_UTF16(ch, tmp, avio_wl16(s, tmp);ret += 2;)
396
    }
397
    avio_wl16(s, 0);
398
    ret += 2;
399
    return ret;
400
}
401

    
402
int ff_get_v_length(uint64_t val){
403
    int i=1;
404

    
405
    while(val>>=7)
406
        i++;
407

    
408
    return i;
409
}
410

    
411
void ff_put_v(AVIOContext *bc, uint64_t val){
412
    int i= ff_get_v_length(val);
413

    
414
    while(--i>0)
415
        avio_w8(bc, 128 | (val>>(7*i)));
416

    
417
    avio_w8(bc, val&127);
418
}
419

    
420
void avio_wl64(AVIOContext *s, uint64_t val)
421
{
422
    avio_wl32(s, (uint32_t)(val & 0xffffffff));
423
    avio_wl32(s, (uint32_t)(val >> 32));
424
}
425

    
426
void avio_wb64(AVIOContext *s, uint64_t val)
427
{
428
    avio_wb32(s, (uint32_t)(val >> 32));
429
    avio_wb32(s, (uint32_t)(val & 0xffffffff));
430
}
431

    
432
void avio_wl16(AVIOContext *s, unsigned int val)
433
{
434
    avio_w8(s, val);
435
    avio_w8(s, val >> 8);
436
}
437

    
438
void avio_wb16(AVIOContext *s, unsigned int val)
439
{
440
    avio_w8(s, val >> 8);
441
    avio_w8(s, val);
442
}
443

    
444
void avio_wl24(AVIOContext *s, unsigned int val)
445
{
446
    avio_wl16(s, val & 0xffff);
447
    avio_w8(s, val >> 16);
448
}
449

    
450
void avio_wb24(AVIOContext *s, unsigned int val)
451
{
452
    avio_wb16(s, val >> 8);
453
    avio_w8(s, val);
454
}
455

    
456
#if FF_API_OLD_AVIO
457
void put_tag(AVIOContext *s, const char *tag)
458
{
459
    while (*tag) {
460
        avio_w8(s, *tag++);
461
    }
462
}
463
#endif
464

    
465
/* Input stream */
466

    
467
static void fill_buffer(AVIOContext *s)
468
{
469
    uint8_t *dst= !s->max_packet_size && s->buf_end - s->buffer < s->buffer_size ? s->buf_ptr : s->buffer;
470
    int len= s->buffer_size - (dst - s->buffer);
471
    int max_buffer_size = s->max_packet_size ? s->max_packet_size : IO_BUFFER_SIZE;
472

    
473
    /* no need to do anything if EOF already reached */
474
    if (s->eof_reached)
475
        return;
476

    
477
    if(s->update_checksum && dst == s->buffer){
478
        if(s->buf_end > s->checksum_ptr)
479
            s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr);
480
        s->checksum_ptr= s->buffer;
481
    }
482

    
483
    /* make buffer smaller in case it ended up large after probing */
484
    if (s->buffer_size > max_buffer_size) {
485
        url_setbufsize(s, max_buffer_size);
486

    
487
        s->checksum_ptr = dst = s->buffer;
488
        len = s->buffer_size;
489
    }
490

    
491
    if(s->read_packet)
492
        len = s->read_packet(s->opaque, dst, len);
493
    else
494
        len = 0;
495
    if (len <= 0) {
496
        /* do not modify buffer if EOF reached so that a seek back can
497
           be done without rereading data */
498
        s->eof_reached = 1;
499
        if(len<0)
500
            s->error= len;
501
    } else {
502
        s->pos += len;
503
        s->buf_ptr = dst;
504
        s->buf_end = dst + len;
505
    }
506
}
507

    
508
unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
509
                                    unsigned int len)
510
{
511
    return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
512
}
513

    
514
unsigned long get_checksum(AVIOContext *s)
515
{
516
    s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
517
    s->update_checksum= NULL;
518
    return s->checksum;
519
}
520

    
521
void init_checksum(AVIOContext *s,
522
                   unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
523
                   unsigned long checksum)
524
{
525
    s->update_checksum= update_checksum;
526
    if(s->update_checksum){
527
        s->checksum= checksum;
528
        s->checksum_ptr= s->buf_ptr;
529
    }
530
}
531

    
532
/* XXX: put an inline version */
533
int avio_r8(AVIOContext *s)
534
{
535
    if (s->buf_ptr >= s->buf_end)
536
        fill_buffer(s);
537
    if (s->buf_ptr < s->buf_end)
538
        return *s->buf_ptr++;
539
    return 0;
540
}
541

    
542
int url_fgetc(AVIOContext *s)
543
{
544
    if (s->buf_ptr >= s->buf_end)
545
        fill_buffer(s);
546
    if (s->buf_ptr < s->buf_end)
547
        return *s->buf_ptr++;
548
    return URL_EOF;
549
}
550

    
551
int avio_read(AVIOContext *s, unsigned char *buf, int size)
552
{
553
    int len, size1;
554

    
555
    size1 = size;
556
    while (size > 0) {
557
        len = s->buf_end - s->buf_ptr;
558
        if (len > size)
559
            len = size;
560
        if (len == 0) {
561
            if(size > s->buffer_size && !s->update_checksum){
562
                if(s->read_packet)
563
                    len = s->read_packet(s->opaque, buf, size);
564
                if (len <= 0) {
565
                    /* do not modify buffer if EOF reached so that a seek back can
566
                    be done without rereading data */
567
                    s->eof_reached = 1;
568
                    if(len<0)
569
                        s->error= len;
570
                    break;
571
                } else {
572
                    s->pos += len;
573
                    size -= len;
574
                    buf += len;
575
                    s->buf_ptr = s->buffer;
576
                    s->buf_end = s->buffer/* + len*/;
577
                }
578
            }else{
579
                fill_buffer(s);
580
                len = s->buf_end - s->buf_ptr;
581
                if (len == 0)
582
                    break;
583
            }
584
        } else {
585
            memcpy(buf, s->buf_ptr, len);
586
            buf += len;
587
            s->buf_ptr += len;
588
            size -= len;
589
        }
590
    }
591
    if (size1 == size) {
592
        if (url_ferror(s)) return url_ferror(s);
593
        if (url_feof(s))   return AVERROR_EOF;
594
    }
595
    return size1 - size;
596
}
597

    
598
int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size)
599
{
600
    int len;
601

    
602
    if(size<0)
603
        return -1;
604

    
605
    len = s->buf_end - s->buf_ptr;
606
    if (len == 0) {
607
        fill_buffer(s);
608
        len = s->buf_end - s->buf_ptr;
609
    }
610
    if (len > size)
611
        len = size;
612
    memcpy(buf, s->buf_ptr, len);
613
    s->buf_ptr += len;
614
    if (!len) {
615
        if (url_ferror(s)) return url_ferror(s);
616
        if (url_feof(s))   return AVERROR_EOF;
617
    }
618
    return len;
619
}
620

    
621
unsigned int avio_rl16(AVIOContext *s)
622
{
623
    unsigned int val;
624
    val = avio_r8(s);
625
    val |= avio_r8(s) << 8;
626
    return val;
627
}
628

    
629
unsigned int avio_rl24(AVIOContext *s)
630
{
631
    unsigned int val;
632
    val = avio_rl16(s);
633
    val |= avio_r8(s) << 16;
634
    return val;
635
}
636

    
637
unsigned int avio_rl32(AVIOContext *s)
638
{
639
    unsigned int val;
640
    val = avio_rl16(s);
641
    val |= avio_rl16(s) << 16;
642
    return val;
643
}
644

    
645
uint64_t avio_rl64(AVIOContext *s)
646
{
647
    uint64_t val;
648
    val = (uint64_t)avio_rl32(s);
649
    val |= (uint64_t)avio_rl32(s) << 32;
650
    return val;
651
}
652

    
653
unsigned int avio_rb16(AVIOContext *s)
654
{
655
    unsigned int val;
656
    val = avio_r8(s) << 8;
657
    val |= avio_r8(s);
658
    return val;
659
}
660

    
661
unsigned int avio_rb24(AVIOContext *s)
662
{
663
    unsigned int val;
664
    val = avio_rb16(s) << 8;
665
    val |= avio_r8(s);
666
    return val;
667
}
668
unsigned int avio_rb32(AVIOContext *s)
669
{
670
    unsigned int val;
671
    val = avio_rb16(s) << 16;
672
    val |= avio_rb16(s);
673
    return val;
674
}
675

    
676
char *get_strz(AVIOContext *s, char *buf, int maxlen)
677
{
678
    int i = 0;
679
    char c;
680

    
681
    while ((c = avio_r8(s))) {
682
        if (i < maxlen-1)
683
            buf[i++] = c;
684
    }
685

    
686
    buf[i] = 0; /* Ensure null terminated, but may be truncated */
687

    
688
    return buf;
689
}
690

    
691
int ff_get_line(AVIOContext *s, char *buf, int maxlen)
692
{
693
    int i = 0;
694
    char c;
695

    
696
    do {
697
        c = avio_r8(s);
698
        if (c && i < maxlen-1)
699
            buf[i++] = c;
700
    } while (c != '\n' && c);
701

    
702
    buf[i] = 0;
703
    return i;
704
}
705

    
706
#define GET_STR16(type, read) \
707
    int avio_get_str16 ##type(AVIOContext *pb, int maxlen, char *buf, int buflen)\
708
{\
709
    char* q = buf;\
710
    int ret = 0;\
711
    while (ret + 1 < maxlen) {\
712
        uint8_t tmp;\
713
        uint32_t ch;\
714
        GET_UTF16(ch, (ret += 2) <= maxlen ? read(pb) : 0, break;)\
715
        if (!ch)\
716
            break;\
717
        PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)\
718
    }\
719
    *q = 0;\
720
    return ret;\
721
}\
722

    
723
GET_STR16(le, avio_rl16)
724
GET_STR16(be, avio_rb16)
725

    
726
#undef GET_STR16
727

    
728
uint64_t avio_rb64(AVIOContext *s)
729
{
730
    uint64_t val;
731
    val = (uint64_t)avio_rb32(s) << 32;
732
    val |= (uint64_t)avio_rb32(s);
733
    return val;
734
}
735

    
736
uint64_t ff_get_v(AVIOContext *bc){
737
    uint64_t val = 0;
738
    int tmp;
739

    
740
    do{
741
        tmp = avio_r8(bc);
742
        val= (val<<7) + (tmp&127);
743
    }while(tmp&128);
744
    return val;
745
}
746

    
747
int url_fdopen(AVIOContext **s, URLContext *h)
748
{
749
    uint8_t *buffer;
750
    int buffer_size, max_packet_size;
751

    
752
    max_packet_size = url_get_max_packet_size(h);
753
    if (max_packet_size) {
754
        buffer_size = max_packet_size; /* no need to bufferize more than one packet */
755
    } else {
756
        buffer_size = IO_BUFFER_SIZE;
757
    }
758
    buffer = av_malloc(buffer_size);
759
    if (!buffer)
760
        return AVERROR(ENOMEM);
761

    
762
    *s = av_mallocz(sizeof(AVIOContext));
763
    if(!*s) {
764
        av_free(buffer);
765
        return AVERROR(ENOMEM);
766
    }
767

    
768
    if (ffio_init_context(*s, buffer, buffer_size,
769
                      (h->flags & URL_WRONLY || h->flags & URL_RDWR), h,
770
                      url_read, url_write, url_seek) < 0) {
771
        av_free(buffer);
772
        av_freep(s);
773
        return AVERROR(EIO);
774
    }
775
    (*s)->is_streamed = h->is_streamed;
776
    (*s)->max_packet_size = max_packet_size;
777
    if(h->prot) {
778
        (*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause;
779
        (*s)->read_seek  = (int64_t (*)(void *, int, int64_t, int))h->prot->url_read_seek;
780
    }
781
    return 0;
782
}
783

    
784
int url_setbufsize(AVIOContext *s, int buf_size)
785
{
786
    uint8_t *buffer;
787
    buffer = av_malloc(buf_size);
788
    if (!buffer)
789
        return AVERROR(ENOMEM);
790

    
791
    av_free(s->buffer);
792
    s->buffer = buffer;
793
    s->buffer_size = buf_size;
794
    s->buf_ptr = buffer;
795
    url_resetbuf(s, s->write_flag ? URL_WRONLY : URL_RDONLY);
796
    return 0;
797
}
798

    
799
#if FF_API_URL_RESETBUF
800
int url_resetbuf(AVIOContext *s, int flags)
801
#else
802
static int url_resetbuf(AVIOContext *s, int flags)
803
#endif
804
{
805
#if FF_API_URL_RESETBUF
806
    if (flags & URL_RDWR)
807
        return AVERROR(EINVAL);
808
#else
809
    assert(flags == URL_WRONLY || flags == URL_RDONLY);
810
#endif
811

    
812
    if (flags & URL_WRONLY) {
813
        s->buf_end = s->buffer + s->buffer_size;
814
        s->write_flag = 1;
815
    } else {
816
        s->buf_end = s->buffer;
817
        s->write_flag = 0;
818
    }
819
    return 0;
820
}
821

    
822
int ff_rewind_with_probe_data(AVIOContext *s, unsigned char *buf, int buf_size)
823
{
824
    int64_t buffer_start;
825
    int buffer_size;
826
    int overlap, new_size, alloc_size;
827

    
828
    if (s->write_flag)
829
        return AVERROR(EINVAL);
830

    
831
    buffer_size = s->buf_end - s->buffer;
832

    
833
    /* the buffers must touch or overlap */
834
    if ((buffer_start = s->pos - buffer_size) > buf_size)
835
        return AVERROR(EINVAL);
836

    
837
    overlap = buf_size - buffer_start;
838
    new_size = buf_size + buffer_size - overlap;
839

    
840
    alloc_size = FFMAX(s->buffer_size, new_size);
841
    if (alloc_size > buf_size)
842
        if (!(buf = av_realloc(buf, alloc_size)))
843
            return AVERROR(ENOMEM);
844

    
845
    if (new_size > buf_size) {
846
        memcpy(buf + buf_size, s->buffer + overlap, buffer_size - overlap);
847
        buf_size = new_size;
848
    }
849

    
850
    av_free(s->buffer);
851
    s->buf_ptr = s->buffer = buf;
852
    s->buffer_size = alloc_size;
853
    s->pos = buf_size;
854
    s->buf_end = s->buf_ptr + buf_size;
855
    s->eof_reached = 0;
856
    s->must_flush = 0;
857

    
858
    return 0;
859
}
860

    
861
int avio_open(AVIOContext **s, const char *filename, int flags)
862
{
863
    URLContext *h;
864
    int err;
865

    
866
    err = url_open(&h, filename, flags);
867
    if (err < 0)
868
        return err;
869
    err = url_fdopen(s, h);
870
    if (err < 0) {
871
        url_close(h);
872
        return err;
873
    }
874
    return 0;
875
}
876

    
877
int avio_close(AVIOContext *s)
878
{
879
    URLContext *h = s->opaque;
880

    
881
    av_free(s->buffer);
882
    av_free(s);
883
    return url_close(h);
884
}
885

    
886
URLContext *url_fileno(AVIOContext *s)
887
{
888
    return s->opaque;
889
}
890

    
891
#if CONFIG_MUXERS
892
int url_fprintf(AVIOContext *s, const char *fmt, ...)
893
{
894
    va_list ap;
895
    char buf[4096];
896
    int ret;
897

    
898
    va_start(ap, fmt);
899
    ret = vsnprintf(buf, sizeof(buf), fmt, ap);
900
    va_end(ap);
901
    avio_write(s, buf, strlen(buf));
902
    return ret;
903
}
904
#endif //CONFIG_MUXERS
905

    
906
char *url_fgets(AVIOContext *s, char *buf, int buf_size)
907
{
908
    int c;
909
    char *q;
910

    
911
    c = url_fgetc(s);
912
    if (c == EOF)
913
        return NULL;
914
    q = buf;
915
    for(;;) {
916
        if (c == EOF || c == '\n')
917
            break;
918
        if ((q - buf) < buf_size - 1)
919
            *q++ = c;
920
        c = url_fgetc(s);
921
    }
922
    if (buf_size > 0)
923
        *q = '\0';
924
    return buf;
925
}
926

    
927
int url_fget_max_packet_size(AVIOContext *s)
928
{
929
    return s->max_packet_size;
930
}
931

    
932
int av_url_read_fpause(AVIOContext *s, int pause)
933
{
934
    if (!s->read_pause)
935
        return AVERROR(ENOSYS);
936
    return s->read_pause(s->opaque, pause);
937
}
938

    
939
int64_t av_url_read_fseek(AVIOContext *s, int stream_index,
940
                          int64_t timestamp, int flags)
941
{
942
    URLContext *h = s->opaque;
943
    int64_t ret;
944
    if (!s->read_seek)
945
        return AVERROR(ENOSYS);
946
    ret = s->read_seek(h, stream_index, timestamp, flags);
947
    if(ret >= 0) {
948
        int64_t pos;
949
        s->buf_ptr = s->buf_end; // Flush buffer
950
        pos = s->seek(h, 0, SEEK_CUR);
951
        if (pos >= 0)
952
            s->pos = pos;
953
        else if (pos != AVERROR(ENOSYS))
954
            ret = pos;
955
    }
956
    return ret;
957
}
958

    
959
/* url_open_dyn_buf and url_close_dyn_buf are used in rtp.c to send a response
960
 * back to the server even if CONFIG_MUXERS is false. */
961
#if CONFIG_MUXERS || CONFIG_NETWORK
962
/* buffer handling */
963
int url_open_buf(AVIOContext **s, uint8_t *buf, int buf_size, int flags)
964
{
965
    int ret;
966
    *s = av_mallocz(sizeof(AVIOContext));
967
    if(!*s)
968
        return AVERROR(ENOMEM);
969
    ret = ffio_init_context(*s, buf, buf_size,
970
                        (flags & URL_WRONLY || flags & URL_RDWR),
971
                        NULL, NULL, NULL, NULL);
972
    if(ret != 0)
973
        av_freep(s);
974
    return ret;
975
}
976

    
977
int url_close_buf(AVIOContext *s)
978
{
979
    put_flush_packet(s);
980
    return s->buf_ptr - s->buffer;
981
}
982

    
983
/* output in a dynamic buffer */
984

    
985
typedef struct DynBuffer {
986
    int pos, size, allocated_size;
987
    uint8_t *buffer;
988
    int io_buffer_size;
989
    uint8_t io_buffer[1];
990
} DynBuffer;
991

    
992
static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
993
{
994
    DynBuffer *d = opaque;
995
    unsigned new_size, new_allocated_size;
996

    
997
    /* reallocate buffer if needed */
998
    new_size = d->pos + buf_size;
999
    new_allocated_size = d->allocated_size;
1000
    if(new_size < d->pos || new_size > INT_MAX/2)
1001
        return -1;
1002
    while (new_size > new_allocated_size) {
1003
        if (!new_allocated_size)
1004
            new_allocated_size = new_size;
1005
        else
1006
            new_allocated_size += new_allocated_size / 2 + 1;
1007
    }
1008

    
1009
    if (new_allocated_size > d->allocated_size) {
1010
        d->buffer = av_realloc(d->buffer, new_allocated_size);
1011
        if(d->buffer == NULL)
1012
             return AVERROR(ENOMEM);
1013
        d->allocated_size = new_allocated_size;
1014
    }
1015
    memcpy(d->buffer + d->pos, buf, buf_size);
1016
    d->pos = new_size;
1017
    if (d->pos > d->size)
1018
        d->size = d->pos;
1019
    return buf_size;
1020
}
1021

    
1022
static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
1023
{
1024
    unsigned char buf1[4];
1025
    int ret;
1026

    
1027
    /* packetized write: output the header */
1028
    AV_WB32(buf1, buf_size);
1029
    ret= dyn_buf_write(opaque, buf1, 4);
1030
    if(ret < 0)
1031
        return ret;
1032

    
1033
    /* then the data */
1034
    return dyn_buf_write(opaque, buf, buf_size);
1035
}
1036

    
1037
static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
1038
{
1039
    DynBuffer *d = opaque;
1040

    
1041
    if (whence == SEEK_CUR)
1042
        offset += d->pos;
1043
    else if (whence == SEEK_END)
1044
        offset += d->size;
1045
    if (offset < 0 || offset > 0x7fffffffLL)
1046
        return -1;
1047
    d->pos = offset;
1048
    return 0;
1049
}
1050

    
1051
static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size)
1052
{
1053
    DynBuffer *d;
1054
    int ret;
1055
    unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
1056

    
1057
    if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
1058
        return -1;
1059
    d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
1060
    if (!d)
1061
        return AVERROR(ENOMEM);
1062
    *s = av_mallocz(sizeof(AVIOContext));
1063
    if(!*s) {
1064
        av_free(d);
1065
        return AVERROR(ENOMEM);
1066
    }
1067
    d->io_buffer_size = io_buffer_size;
1068
    ret = ffio_init_context(*s, d->io_buffer, io_buffer_size,
1069
                        1, d, NULL,
1070
                        max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
1071
                        max_packet_size ? NULL : dyn_buf_seek);
1072
    if (ret == 0) {
1073
        (*s)->max_packet_size = max_packet_size;
1074
    } else {
1075
        av_free(d);
1076
        av_freep(s);
1077
    }
1078
    return ret;
1079
}
1080

    
1081
int url_open_dyn_buf(AVIOContext **s)
1082
{
1083
    return url_open_dyn_buf_internal(s, 0);
1084
}
1085

    
1086
int url_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
1087
{
1088
    if (max_packet_size <= 0)
1089
        return -1;
1090
    return url_open_dyn_buf_internal(s, max_packet_size);
1091
}
1092

    
1093
int url_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
1094
{
1095
    DynBuffer *d = s->opaque;
1096
    int size;
1097
    static const char padbuf[FF_INPUT_BUFFER_PADDING_SIZE] = {0};
1098
    int padding = 0;
1099

    
1100
    /* don't attempt to pad fixed-size packet buffers */
1101
    if (!s->max_packet_size) {
1102
        avio_write(s, padbuf, sizeof(padbuf));
1103
        padding = FF_INPUT_BUFFER_PADDING_SIZE;
1104
    }
1105

    
1106
    put_flush_packet(s);
1107

    
1108
    *pbuffer = d->buffer;
1109
    size = d->size;
1110
    av_free(d);
1111
    av_free(s);
1112
    return size - padding;
1113
}
1114
#endif /* CONFIG_MUXERS || CONFIG_NETWORK */