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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
 *
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 * 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"
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),
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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 put_byte(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 put_nbyte(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 put_buffer(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 url_fseek(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 = url_fseek(s, offset, SEEK_CUR);
239
    return ret < 0 ? ret : 0;
240
}
241

    
242
int64_t url_ftell(AVIOContext *s)
243
{
244
    return url_fseek(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 put_le32(AVIOContext *s, unsigned int val)
281
{
282
    put_byte(s, val);
283
    put_byte(s, val >> 8);
284
    put_byte(s, val >> 16);
285
    put_byte(s, val >> 24);
286
}
287

    
288
void put_be32(AVIOContext *s, unsigned int val)
289
{
290
    put_byte(s, val >> 24);
291
    put_byte(s, val >> 16);
292
    put_byte(s, val >> 8);
293
    put_byte(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
int get_byte(AVIOContext *s)
320
{
321
   return avio_r8(s);
322
}
323
int get_buffer(AVIOContext *s, unsigned char *buf, int size)
324
{
325
    return avio_read(s, buf, size);
326
}
327
#endif
328

    
329
int avio_put_str(AVIOContext *s, const char *str)
330
{
331
    int len = 1;
332
    if (str) {
333
        len += strlen(str);
334
        put_buffer(s, (const unsigned char *) str, len);
335
    } else
336
        put_byte(s, 0);
337
    return len;
338
}
339

    
340
int avio_put_str16le(AVIOContext *s, const char *str)
341
{
342
    const uint8_t *q = str;
343
    int ret = 0;
344

    
345
    while (*q) {
346
        uint32_t ch;
347
        uint16_t tmp;
348

    
349
        GET_UTF8(ch, *q++, break;)
350
        PUT_UTF16(ch, tmp, put_le16(s, tmp);ret += 2;)
351
    }
352
    put_le16(s, 0);
353
    ret += 2;
354
    return ret;
355
}
356

    
357
int ff_get_v_length(uint64_t val){
358
    int i=1;
359

    
360
    while(val>>=7)
361
        i++;
362

    
363
    return i;
364
}
365

    
366
void ff_put_v(AVIOContext *bc, uint64_t val){
367
    int i= ff_get_v_length(val);
368

    
369
    while(--i>0)
370
        put_byte(bc, 128 | (val>>(7*i)));
371

    
372
    put_byte(bc, val&127);
373
}
374

    
375
void put_le64(AVIOContext *s, uint64_t val)
376
{
377
    put_le32(s, (uint32_t)(val & 0xffffffff));
378
    put_le32(s, (uint32_t)(val >> 32));
379
}
380

    
381
void put_be64(AVIOContext *s, uint64_t val)
382
{
383
    put_be32(s, (uint32_t)(val >> 32));
384
    put_be32(s, (uint32_t)(val & 0xffffffff));
385
}
386

    
387
void put_le16(AVIOContext *s, unsigned int val)
388
{
389
    put_byte(s, val);
390
    put_byte(s, val >> 8);
391
}
392

    
393
void put_be16(AVIOContext *s, unsigned int val)
394
{
395
    put_byte(s, val >> 8);
396
    put_byte(s, val);
397
}
398

    
399
void put_le24(AVIOContext *s, unsigned int val)
400
{
401
    put_le16(s, val & 0xffff);
402
    put_byte(s, val >> 16);
403
}
404

    
405
void put_be24(AVIOContext *s, unsigned int val)
406
{
407
    put_be16(s, val >> 8);
408
    put_byte(s, val);
409
}
410

    
411
void put_tag(AVIOContext *s, const char *tag)
412
{
413
    while (*tag) {
414
        put_byte(s, *tag++);
415
    }
416
}
417

    
418
/* Input stream */
419

    
420
static void fill_buffer(AVIOContext *s)
421
{
422
    uint8_t *dst= !s->max_packet_size && s->buf_end - s->buffer < s->buffer_size ? s->buf_ptr : s->buffer;
423
    int len= s->buffer_size - (dst - s->buffer);
424
    int max_buffer_size = s->max_packet_size ? s->max_packet_size : IO_BUFFER_SIZE;
425

    
426
    /* no need to do anything if EOF already reached */
427
    if (s->eof_reached)
428
        return;
429

    
430
    if(s->update_checksum && dst == s->buffer){
431
        if(s->buf_end > s->checksum_ptr)
432
            s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr);
433
        s->checksum_ptr= s->buffer;
434
    }
435

    
436
    /* make buffer smaller in case it ended up large after probing */
437
    if (s->buffer_size > max_buffer_size) {
438
        url_setbufsize(s, max_buffer_size);
439

    
440
        s->checksum_ptr = dst = s->buffer;
441
        len = s->buffer_size;
442
    }
443

    
444
    if(s->read_packet)
445
        len = s->read_packet(s->opaque, dst, len);
446
    else
447
        len = 0;
448
    if (len <= 0) {
449
        /* do not modify buffer if EOF reached so that a seek back can
450
           be done without rereading data */
451
        s->eof_reached = 1;
452
        if(len<0)
453
            s->error= len;
454
    } else {
455
        s->pos += len;
456
        s->buf_ptr = dst;
457
        s->buf_end = dst + len;
458
    }
459
}
460

    
461
unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
462
                                    unsigned int len)
463
{
464
    return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
465
}
466

    
467
unsigned long get_checksum(AVIOContext *s)
468
{
469
    s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
470
    s->update_checksum= NULL;
471
    return s->checksum;
472
}
473

    
474
void init_checksum(AVIOContext *s,
475
                   unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
476
                   unsigned long checksum)
477
{
478
    s->update_checksum= update_checksum;
479
    if(s->update_checksum){
480
        s->checksum= checksum;
481
        s->checksum_ptr= s->buf_ptr;
482
    }
483
}
484

    
485
/* XXX: put an inline version */
486
int avio_r8(AVIOContext *s)
487
{
488
    if (s->buf_ptr >= s->buf_end)
489
        fill_buffer(s);
490
    if (s->buf_ptr < s->buf_end)
491
        return *s->buf_ptr++;
492
    return 0;
493
}
494

    
495
int url_fgetc(AVIOContext *s)
496
{
497
    if (s->buf_ptr >= s->buf_end)
498
        fill_buffer(s);
499
    if (s->buf_ptr < s->buf_end)
500
        return *s->buf_ptr++;
501
    return URL_EOF;
502
}
503

    
504
int avio_read(AVIOContext *s, unsigned char *buf, int size)
505
{
506
    int len, size1;
507

    
508
    size1 = size;
509
    while (size > 0) {
510
        len = s->buf_end - s->buf_ptr;
511
        if (len > size)
512
            len = size;
513
        if (len == 0) {
514
            if(size > s->buffer_size && !s->update_checksum){
515
                if(s->read_packet)
516
                    len = s->read_packet(s->opaque, buf, size);
517
                if (len <= 0) {
518
                    /* do not modify buffer if EOF reached so that a seek back can
519
                    be done without rereading data */
520
                    s->eof_reached = 1;
521
                    if(len<0)
522
                        s->error= len;
523
                    break;
524
                } else {
525
                    s->pos += len;
526
                    size -= len;
527
                    buf += len;
528
                    s->buf_ptr = s->buffer;
529
                    s->buf_end = s->buffer/* + len*/;
530
                }
531
            }else{
532
                fill_buffer(s);
533
                len = s->buf_end - s->buf_ptr;
534
                if (len == 0)
535
                    break;
536
            }
537
        } else {
538
            memcpy(buf, s->buf_ptr, len);
539
            buf += len;
540
            s->buf_ptr += len;
541
            size -= len;
542
        }
543
    }
544
    if (size1 == size) {
545
        if (url_ferror(s)) return url_ferror(s);
546
        if (url_feof(s))   return AVERROR_EOF;
547
    }
548
    return size1 - size;
549
}
550

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

    
555
    if(size<0)
556
        return -1;
557

    
558
    len = s->buf_end - s->buf_ptr;
559
    if (len == 0) {
560
        fill_buffer(s);
561
        len = s->buf_end - s->buf_ptr;
562
    }
563
    if (len > size)
564
        len = size;
565
    memcpy(buf, s->buf_ptr, len);
566
    s->buf_ptr += len;
567
    if (!len) {
568
        if (url_ferror(s)) return url_ferror(s);
569
        if (url_feof(s))   return AVERROR_EOF;
570
    }
571
    return len;
572
}
573

    
574
unsigned int avio_rl16(AVIOContext *s)
575
{
576
    unsigned int val;
577
    val = avio_r8(s);
578
    val |= avio_r8(s) << 8;
579
    return val;
580
}
581

    
582
unsigned int avio_rl24(AVIOContext *s)
583
{
584
    unsigned int val;
585
    val = avio_rl16(s);
586
    val |= avio_r8(s) << 16;
587
    return val;
588
}
589

    
590
unsigned int avio_rl32(AVIOContext *s)
591
{
592
    unsigned int val;
593
    val = avio_rl16(s);
594
    val |= avio_rl16(s) << 16;
595
    return val;
596
}
597

    
598
uint64_t avio_rl64(AVIOContext *s)
599
{
600
    uint64_t val;
601
    val = (uint64_t)avio_rl32(s);
602
    val |= (uint64_t)avio_rl32(s) << 32;
603
    return val;
604
}
605

    
606
unsigned int avio_rb16(AVIOContext *s)
607
{
608
    unsigned int val;
609
    val = avio_r8(s) << 8;
610
    val |= avio_r8(s);
611
    return val;
612
}
613

    
614
unsigned int avio_rb24(AVIOContext *s)
615
{
616
    unsigned int val;
617
    val = avio_rb16(s) << 8;
618
    val |= avio_r8(s);
619
    return val;
620
}
621
unsigned int avio_rb32(AVIOContext *s)
622
{
623
    unsigned int val;
624
    val = avio_rb16(s) << 16;
625
    val |= avio_rb16(s);
626
    return val;
627
}
628

    
629
char *get_strz(AVIOContext *s, char *buf, int maxlen)
630
{
631
    int i = 0;
632
    char c;
633

    
634
    while ((c = avio_r8(s))) {
635
        if (i < maxlen-1)
636
            buf[i++] = c;
637
    }
638

    
639
    buf[i] = 0; /* Ensure null terminated, but may be truncated */
640

    
641
    return buf;
642
}
643

    
644
int ff_get_line(AVIOContext *s, char *buf, int maxlen)
645
{
646
    int i = 0;
647
    char c;
648

    
649
    do {
650
        c = avio_r8(s);
651
        if (c && i < maxlen-1)
652
            buf[i++] = c;
653
    } while (c != '\n' && c);
654

    
655
    buf[i] = 0;
656
    return i;
657
}
658

    
659
#define GET_STR16(type, read) \
660
    int avio_get_str16 ##type(AVIOContext *pb, int maxlen, char *buf, int buflen)\
661
{\
662
    char* q = buf;\
663
    int ret = 0;\
664
    while (ret + 1 < maxlen) {\
665
        uint8_t tmp;\
666
        uint32_t ch;\
667
        GET_UTF16(ch, (ret += 2) <= maxlen ? read(pb) : 0, break;)\
668
        if (!ch)\
669
            break;\
670
        PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)\
671
    }\
672
    *q = 0;\
673
    return ret;\
674
}\
675

    
676
GET_STR16(le, avio_rl16)
677
GET_STR16(be, avio_rb16)
678

    
679
#undef GET_STR16
680

    
681
uint64_t avio_rb64(AVIOContext *s)
682
{
683
    uint64_t val;
684
    val = (uint64_t)avio_rb32(s) << 32;
685
    val |= (uint64_t)avio_rb32(s);
686
    return val;
687
}
688

    
689
uint64_t ff_get_v(AVIOContext *bc){
690
    uint64_t val = 0;
691
    int tmp;
692

    
693
    do{
694
        tmp = avio_r8(bc);
695
        val= (val<<7) + (tmp&127);
696
    }while(tmp&128);
697
    return val;
698
}
699

    
700
int url_fdopen(AVIOContext **s, URLContext *h)
701
{
702
    uint8_t *buffer;
703
    int buffer_size, max_packet_size;
704

    
705
    max_packet_size = url_get_max_packet_size(h);
706
    if (max_packet_size) {
707
        buffer_size = max_packet_size; /* no need to bufferize more than one packet */
708
    } else {
709
        buffer_size = IO_BUFFER_SIZE;
710
    }
711
    buffer = av_malloc(buffer_size);
712
    if (!buffer)
713
        return AVERROR(ENOMEM);
714

    
715
    *s = av_mallocz(sizeof(AVIOContext));
716
    if(!*s) {
717
        av_free(buffer);
718
        return AVERROR(ENOMEM);
719
    }
720

    
721
    if (ffio_init_context(*s, buffer, buffer_size,
722
                      (h->flags & URL_WRONLY || h->flags & URL_RDWR), h,
723
                      url_read, url_write, url_seek) < 0) {
724
        av_free(buffer);
725
        av_freep(s);
726
        return AVERROR(EIO);
727
    }
728
    (*s)->is_streamed = h->is_streamed;
729
    (*s)->max_packet_size = max_packet_size;
730
    if(h->prot) {
731
        (*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause;
732
        (*s)->read_seek  = (int64_t (*)(void *, int, int64_t, int))h->prot->url_read_seek;
733
    }
734
    return 0;
735
}
736

    
737
int url_setbufsize(AVIOContext *s, int buf_size)
738
{
739
    uint8_t *buffer;
740
    buffer = av_malloc(buf_size);
741
    if (!buffer)
742
        return AVERROR(ENOMEM);
743

    
744
    av_free(s->buffer);
745
    s->buffer = buffer;
746
    s->buffer_size = buf_size;
747
    s->buf_ptr = buffer;
748
    url_resetbuf(s, s->write_flag ? URL_WRONLY : URL_RDONLY);
749
    return 0;
750
}
751

    
752
#if FF_API_URL_RESETBUF
753
int url_resetbuf(AVIOContext *s, int flags)
754
#else
755
static int url_resetbuf(AVIOContext *s, int flags)
756
#endif
757
{
758
#if FF_API_URL_RESETBUF
759
    if (flags & URL_RDWR)
760
        return AVERROR(EINVAL);
761
#else
762
    assert(flags == URL_WRONLY || flags == URL_RDONLY);
763
#endif
764

    
765
    if (flags & URL_WRONLY) {
766
        s->buf_end = s->buffer + s->buffer_size;
767
        s->write_flag = 1;
768
    } else {
769
        s->buf_end = s->buffer;
770
        s->write_flag = 0;
771
    }
772
    return 0;
773
}
774

    
775
int ff_rewind_with_probe_data(AVIOContext *s, unsigned char *buf, int buf_size)
776
{
777
    int64_t buffer_start;
778
    int buffer_size;
779
    int overlap, new_size, alloc_size;
780

    
781
    if (s->write_flag)
782
        return AVERROR(EINVAL);
783

    
784
    buffer_size = s->buf_end - s->buffer;
785

    
786
    /* the buffers must touch or overlap */
787
    if ((buffer_start = s->pos - buffer_size) > buf_size)
788
        return AVERROR(EINVAL);
789

    
790
    overlap = buf_size - buffer_start;
791
    new_size = buf_size + buffer_size - overlap;
792

    
793
    alloc_size = FFMAX(s->buffer_size, new_size);
794
    if (alloc_size > buf_size)
795
        if (!(buf = av_realloc(buf, alloc_size)))
796
            return AVERROR(ENOMEM);
797

    
798
    if (new_size > buf_size) {
799
        memcpy(buf + buf_size, s->buffer + overlap, buffer_size - overlap);
800
        buf_size = new_size;
801
    }
802

    
803
    av_free(s->buffer);
804
    s->buf_ptr = s->buffer = buf;
805
    s->buffer_size = alloc_size;
806
    s->pos = buf_size;
807
    s->buf_end = s->buf_ptr + buf_size;
808
    s->eof_reached = 0;
809
    s->must_flush = 0;
810

    
811
    return 0;
812
}
813

    
814
int url_fopen(AVIOContext **s, const char *filename, int flags)
815
{
816
    URLContext *h;
817
    int err;
818

    
819
    err = url_open(&h, filename, flags);
820
    if (err < 0)
821
        return err;
822
    err = url_fdopen(s, h);
823
    if (err < 0) {
824
        url_close(h);
825
        return err;
826
    }
827
    return 0;
828
}
829

    
830
int url_fclose(AVIOContext *s)
831
{
832
    URLContext *h = s->opaque;
833

    
834
    av_free(s->buffer);
835
    av_free(s);
836
    return url_close(h);
837
}
838

    
839
URLContext *url_fileno(AVIOContext *s)
840
{
841
    return s->opaque;
842
}
843

    
844
#if CONFIG_MUXERS
845
int url_fprintf(AVIOContext *s, const char *fmt, ...)
846
{
847
    va_list ap;
848
    char buf[4096];
849
    int ret;
850

    
851
    va_start(ap, fmt);
852
    ret = vsnprintf(buf, sizeof(buf), fmt, ap);
853
    va_end(ap);
854
    put_buffer(s, buf, strlen(buf));
855
    return ret;
856
}
857
#endif //CONFIG_MUXERS
858

    
859
char *url_fgets(AVIOContext *s, char *buf, int buf_size)
860
{
861
    int c;
862
    char *q;
863

    
864
    c = url_fgetc(s);
865
    if (c == EOF)
866
        return NULL;
867
    q = buf;
868
    for(;;) {
869
        if (c == EOF || c == '\n')
870
            break;
871
        if ((q - buf) < buf_size - 1)
872
            *q++ = c;
873
        c = url_fgetc(s);
874
    }
875
    if (buf_size > 0)
876
        *q = '\0';
877
    return buf;
878
}
879

    
880
int url_fget_max_packet_size(AVIOContext *s)
881
{
882
    return s->max_packet_size;
883
}
884

    
885
int av_url_read_fpause(AVIOContext *s, int pause)
886
{
887
    if (!s->read_pause)
888
        return AVERROR(ENOSYS);
889
    return s->read_pause(s->opaque, pause);
890
}
891

    
892
int64_t av_url_read_fseek(AVIOContext *s, int stream_index,
893
                          int64_t timestamp, int flags)
894
{
895
    URLContext *h = s->opaque;
896
    int64_t ret;
897
    if (!s->read_seek)
898
        return AVERROR(ENOSYS);
899
    ret = s->read_seek(h, stream_index, timestamp, flags);
900
    if(ret >= 0) {
901
        int64_t pos;
902
        s->buf_ptr = s->buf_end; // Flush buffer
903
        pos = s->seek(h, 0, SEEK_CUR);
904
        if (pos >= 0)
905
            s->pos = pos;
906
        else if (pos != AVERROR(ENOSYS))
907
            ret = pos;
908
    }
909
    return ret;
910
}
911

    
912
/* url_open_dyn_buf and url_close_dyn_buf are used in rtp.c to send a response
913
 * back to the server even if CONFIG_MUXERS is false. */
914
#if CONFIG_MUXERS || CONFIG_NETWORK
915
/* buffer handling */
916
int url_open_buf(AVIOContext **s, uint8_t *buf, int buf_size, int flags)
917
{
918
    int ret;
919
    *s = av_mallocz(sizeof(AVIOContext));
920
    if(!*s)
921
        return AVERROR(ENOMEM);
922
    ret = ffio_init_context(*s, buf, buf_size,
923
                        (flags & URL_WRONLY || flags & URL_RDWR),
924
                        NULL, NULL, NULL, NULL);
925
    if(ret != 0)
926
        av_freep(s);
927
    return ret;
928
}
929

    
930
int url_close_buf(AVIOContext *s)
931
{
932
    put_flush_packet(s);
933
    return s->buf_ptr - s->buffer;
934
}
935

    
936
/* output in a dynamic buffer */
937

    
938
typedef struct DynBuffer {
939
    int pos, size, allocated_size;
940
    uint8_t *buffer;
941
    int io_buffer_size;
942
    uint8_t io_buffer[1];
943
} DynBuffer;
944

    
945
static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
946
{
947
    DynBuffer *d = opaque;
948
    unsigned new_size, new_allocated_size;
949

    
950
    /* reallocate buffer if needed */
951
    new_size = d->pos + buf_size;
952
    new_allocated_size = d->allocated_size;
953
    if(new_size < d->pos || new_size > INT_MAX/2)
954
        return -1;
955
    while (new_size > new_allocated_size) {
956
        if (!new_allocated_size)
957
            new_allocated_size = new_size;
958
        else
959
            new_allocated_size += new_allocated_size / 2 + 1;
960
    }
961

    
962
    if (new_allocated_size > d->allocated_size) {
963
        d->buffer = av_realloc(d->buffer, new_allocated_size);
964
        if(d->buffer == NULL)
965
             return AVERROR(ENOMEM);
966
        d->allocated_size = new_allocated_size;
967
    }
968
    memcpy(d->buffer + d->pos, buf, buf_size);
969
    d->pos = new_size;
970
    if (d->pos > d->size)
971
        d->size = d->pos;
972
    return buf_size;
973
}
974

    
975
static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
976
{
977
    unsigned char buf1[4];
978
    int ret;
979

    
980
    /* packetized write: output the header */
981
    AV_WB32(buf1, buf_size);
982
    ret= dyn_buf_write(opaque, buf1, 4);
983
    if(ret < 0)
984
        return ret;
985

    
986
    /* then the data */
987
    return dyn_buf_write(opaque, buf, buf_size);
988
}
989

    
990
static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
991
{
992
    DynBuffer *d = opaque;
993

    
994
    if (whence == SEEK_CUR)
995
        offset += d->pos;
996
    else if (whence == SEEK_END)
997
        offset += d->size;
998
    if (offset < 0 || offset > 0x7fffffffLL)
999
        return -1;
1000
    d->pos = offset;
1001
    return 0;
1002
}
1003

    
1004
static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size)
1005
{
1006
    DynBuffer *d;
1007
    int ret;
1008
    unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
1009

    
1010
    if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
1011
        return -1;
1012
    d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
1013
    if (!d)
1014
        return AVERROR(ENOMEM);
1015
    *s = av_mallocz(sizeof(AVIOContext));
1016
    if(!*s) {
1017
        av_free(d);
1018
        return AVERROR(ENOMEM);
1019
    }
1020
    d->io_buffer_size = io_buffer_size;
1021
    ret = ffio_init_context(*s, d->io_buffer, io_buffer_size,
1022
                        1, d, NULL,
1023
                        max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
1024
                        max_packet_size ? NULL : dyn_buf_seek);
1025
    if (ret == 0) {
1026
        (*s)->max_packet_size = max_packet_size;
1027
    } else {
1028
        av_free(d);
1029
        av_freep(s);
1030
    }
1031
    return ret;
1032
}
1033

    
1034
int url_open_dyn_buf(AVIOContext **s)
1035
{
1036
    return url_open_dyn_buf_internal(s, 0);
1037
}
1038

    
1039
int url_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
1040
{
1041
    if (max_packet_size <= 0)
1042
        return -1;
1043
    return url_open_dyn_buf_internal(s, max_packet_size);
1044
}
1045

    
1046
int url_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
1047
{
1048
    DynBuffer *d = s->opaque;
1049
    int size;
1050
    static const char padbuf[FF_INPUT_BUFFER_PADDING_SIZE] = {0};
1051
    int padding = 0;
1052

    
1053
    /* don't attempt to pad fixed-size packet buffers */
1054
    if (!s->max_packet_size) {
1055
        put_buffer(s, padbuf, sizeof(padbuf));
1056
        padding = FF_INPUT_BUFFER_PADDING_SIZE;
1057
    }
1058

    
1059
    put_flush_packet(s);
1060

    
1061
    *pbuffer = d->buffer;
1062
    size = d->size;
1063
    av_free(d);
1064
    av_free(s);
1065
    return size - padding;
1066
}
1067
#endif /* CONFIG_MUXERS || CONFIG_NETWORK */