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ffmpeg / libavformat / aviobuf.c @ 7be806f3

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1 de6d9b64 Fabrice Bellard
/*
2
 * Buffered I/O for ffmpeg system
3 19720f15 Fabrice Bellard
 * Copyright (c) 2000,2001 Fabrice Bellard
4 de6d9b64 Fabrice Bellard
 *
5 19720f15 Fabrice Bellard
 * This library is free software; you can redistribute it and/or
6
 * modify it under the terms of the GNU Lesser General Public
7
 * License as published by the Free Software Foundation; either
8
 * version 2 of the License, or (at your option) any later version.
9 de6d9b64 Fabrice Bellard
 *
10 19720f15 Fabrice Bellard
 * This library is distributed in the hope that it will be useful,
11 de6d9b64 Fabrice Bellard
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 19720f15 Fabrice Bellard
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13
 * Lesser General Public License for more details.
14 de6d9b64 Fabrice Bellard
 *
15 19720f15 Fabrice Bellard
 * You should have received a copy of the GNU Lesser General Public
16
 * License along with this library; if not, write to the Free Software
17
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18 de6d9b64 Fabrice Bellard
 */
19
#include "avformat.h"
20 5c91a675 Zdenek Kabelac
#include "avio.h"
21 abba3dd1 Fabrice Bellard
#include <stdarg.h>
22 de6d9b64 Fabrice Bellard
23
#define IO_BUFFER_SIZE 32768
24
25
int init_put_byte(ByteIOContext *s,
26
                  unsigned char *buffer,
27
                  int buffer_size,
28
                  int write_flag,
29
                  void *opaque,
30 0c1a9eda Zdenek Kabelac
                  int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
31 576ae256 Michael Niedermayer
                  int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
32 de6d9b64 Fabrice Bellard
                  int (*seek)(void *opaque, offset_t offset, int whence))
33
{
34
    s->buffer = buffer;
35
    s->buffer_size = buffer_size;
36
    s->buf_ptr = buffer;
37
    s->write_flag = write_flag;
38
    if (!s->write_flag) 
39
        s->buf_end = buffer;
40
    else
41
        s->buf_end = buffer + buffer_size;
42
    s->opaque = opaque;
43
    s->write_packet = write_packet;
44
    s->read_packet = read_packet;
45
    s->seek = seek;
46
    s->pos = 0;
47
    s->must_flush = 0;
48
    s->eof_reached = 0;
49 576ae256 Michael Niedermayer
    s->error = 0;
50 de6d9b64 Fabrice Bellard
    s->is_streamed = 0;
51 abba3dd1 Fabrice Bellard
    s->max_packet_size = 0;
52 ee9f36a8 Michael Niedermayer
    s->update_checksum= NULL;
53 de6d9b64 Fabrice Bellard
    return 0;
54
}
55
                  
56
57 764ef400 Mike Melanson
#ifdef CONFIG_ENCODERS
58 de6d9b64 Fabrice Bellard
static void flush_buffer(ByteIOContext *s)
59
{
60
    if (s->buf_ptr > s->buffer) {
61 576ae256 Michael Niedermayer
        if (s->write_packet && !s->error){
62
            int ret= s->write_packet(s->opaque, s->buffer, s->buf_ptr - s->buffer);
63
            if(ret < 0){
64
                s->error = ret;
65
            }
66
        }
67 465e1dad Michael Niedermayer
        if(s->update_checksum){
68 ee9f36a8 Michael Niedermayer
            s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
69
            s->checksum_ptr= s->buffer;
70
        }
71 de6d9b64 Fabrice Bellard
        s->pos += s->buf_ptr - s->buffer;
72
    }
73
    s->buf_ptr = s->buffer;
74
}
75
76
void put_byte(ByteIOContext *s, int b)
77
{
78
    *(s->buf_ptr)++ = b;
79
    if (s->buf_ptr >= s->buf_end) 
80
        flush_buffer(s);
81
}
82
83 75bdb984 Philip Gladstone
void put_buffer(ByteIOContext *s, const unsigned char *buf, int size)
84 de6d9b64 Fabrice Bellard
{
85
    int len;
86
87
    while (size > 0) {
88
        len = (s->buf_end - s->buf_ptr);
89
        if (len > size)
90
            len = size;
91
        memcpy(s->buf_ptr, buf, len);
92
        s->buf_ptr += len;
93
94
        if (s->buf_ptr >= s->buf_end) 
95
            flush_buffer(s);
96
97
        buf += len;
98
        size -= len;
99
    }
100
}
101
102
void put_flush_packet(ByteIOContext *s)
103
{
104
    flush_buffer(s);
105
    s->must_flush = 0;
106
}
107 764ef400 Mike Melanson
#endif //CONFIG_ENCODERS
108 de6d9b64 Fabrice Bellard
109
offset_t url_fseek(ByteIOContext *s, offset_t offset, int whence)
110
{
111
    offset_t offset1;
112
113
    if (whence != SEEK_CUR && whence != SEEK_SET)
114
        return -EINVAL;
115
    
116 764ef400 Mike Melanson
#ifdef CONFIG_ENCODERS
117 de6d9b64 Fabrice Bellard
    if (s->write_flag) {
118
        if (whence == SEEK_CUR) {
119 4606ac8d Zdenek Kabelac
            offset1 = s->pos + (s->buf_ptr - s->buffer);
120 de6d9b64 Fabrice Bellard
            if (offset == 0)
121
                return offset1;
122
            offset += offset1;
123
        }
124
        offset1 = offset - s->pos;
125
        if (!s->must_flush && 
126
            offset1 >= 0 && offset1 < (s->buf_end - s->buffer)) {
127
            /* can do the seek inside the buffer */
128
            s->buf_ptr = s->buffer + offset1;
129
        } else {
130
            if (!s->seek)
131
                return -EPIPE;
132
            flush_buffer(s);
133
            s->must_flush = 1;
134
            s->buf_ptr = s->buffer;
135
            s->seek(s->opaque, offset, SEEK_SET);
136
            s->pos = offset;
137
        }
138 764ef400 Mike Melanson
    } else 
139
#endif //CONFIG_ENCODERS
140
    {
141 de6d9b64 Fabrice Bellard
        if (whence == SEEK_CUR) {
142
            offset1 = s->pos - (s->buf_end - s->buffer) + (s->buf_ptr - s->buffer);
143
            if (offset == 0)
144
                return offset1;
145
            offset += offset1;
146
        }
147
        offset1 = offset - (s->pos - (s->buf_end - s->buffer));
148
        if (offset1 >= 0 && offset1 <= (s->buf_end - s->buffer)) {
149
            /* can do the seek inside the buffer */
150
            s->buf_ptr = s->buffer + offset1;
151
        } else {
152
            if (!s->seek)
153
                return -EPIPE;
154
            s->buf_ptr = s->buffer;
155
            s->buf_end = s->buffer;
156 53e2f9ca Michael Niedermayer
            if (s->seek(s->opaque, offset, SEEK_SET) == (offset_t)-EPIPE)
157
                return -EPIPE;
158 de6d9b64 Fabrice Bellard
            s->pos = offset;
159
        }
160 abba3dd1 Fabrice Bellard
        s->eof_reached = 0;
161 de6d9b64 Fabrice Bellard
    }
162
    return offset;
163
}
164
165
void url_fskip(ByteIOContext *s, offset_t offset)
166
{
167
    url_fseek(s, offset, SEEK_CUR);
168
}
169
170
offset_t url_ftell(ByteIOContext *s)
171
{
172
    return url_fseek(s, 0, SEEK_CUR);
173
}
174
175
int url_feof(ByteIOContext *s)
176
{
177
    return s->eof_reached;
178
}
179
180 576ae256 Michael Niedermayer
int url_ferror(ByteIOContext *s)
181
{
182
    return s->error;
183
}
184
185 764ef400 Mike Melanson
#ifdef CONFIG_ENCODERS
186 de6d9b64 Fabrice Bellard
void put_le32(ByteIOContext *s, unsigned int val)
187
{
188
    put_byte(s, val);
189
    put_byte(s, val >> 8);
190
    put_byte(s, val >> 16);
191
    put_byte(s, val >> 24);
192
}
193
194
void put_be32(ByteIOContext *s, unsigned int val)
195
{
196
    put_byte(s, val >> 24);
197
    put_byte(s, val >> 16);
198
    put_byte(s, val >> 8);
199
    put_byte(s, val);
200
}
201
202 3b4b29dc Fabrice Bellard
/* IEEE format is assumed */
203
void put_be64_double(ByteIOContext *s, double val)
204
{
205
    union {
206
        double d;
207 0c1a9eda Zdenek Kabelac
        uint64_t ull;
208 3b4b29dc Fabrice Bellard
    } u;
209
    u.d = val;
210
    put_be64(s, u.ull);
211 75bdb984 Philip Gladstone
}
212
213 3b4b29dc Fabrice Bellard
void put_strz(ByteIOContext *s, const char *str)
214 75bdb984 Philip Gladstone
{
215
    if (str)
216
        put_buffer(s, (const unsigned char *) str, strlen(str) + 1);
217
    else
218
        put_byte(s, 0);
219
}
220
221 0c1a9eda Zdenek Kabelac
void put_le64(ByteIOContext *s, uint64_t val)
222 de6d9b64 Fabrice Bellard
{
223 0c1a9eda Zdenek Kabelac
    put_le32(s, (uint32_t)(val & 0xffffffff));
224
    put_le32(s, (uint32_t)(val >> 32));
225 de6d9b64 Fabrice Bellard
}
226
227 0c1a9eda Zdenek Kabelac
void put_be64(ByteIOContext *s, uint64_t val)
228 de6d9b64 Fabrice Bellard
{
229 0c1a9eda Zdenek Kabelac
    put_be32(s, (uint32_t)(val >> 32));
230
    put_be32(s, (uint32_t)(val & 0xffffffff));
231 de6d9b64 Fabrice Bellard
}
232
233
void put_le16(ByteIOContext *s, unsigned int val)
234
{
235
    put_byte(s, val);
236
    put_byte(s, val >> 8);
237
}
238
239
void put_be16(ByteIOContext *s, unsigned int val)
240
{
241
    put_byte(s, val >> 8);
242
    put_byte(s, val);
243
}
244
245 0570bf06 Zdenek Kabelac
void put_tag(ByteIOContext *s, const char *tag)
246 de6d9b64 Fabrice Bellard
{
247
    while (*tag) {
248
        put_byte(s, *tag++);
249
    }
250
}
251 764ef400 Mike Melanson
#endif //CONFIG_ENCODERS
252 de6d9b64 Fabrice Bellard
253
/* Input stream */
254
255
static void fill_buffer(ByteIOContext *s)
256
{
257
    int len;
258
259 abba3dd1 Fabrice Bellard
    /* no need to do anything if EOF already reached */
260
    if (s->eof_reached)
261
        return;
262 ee9f36a8 Michael Niedermayer
263 465e1dad Michael Niedermayer
    if(s->update_checksum){
264 ee9f36a8 Michael Niedermayer
        s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr);
265
        s->checksum_ptr= s->buffer;
266
    }
267
268 de6d9b64 Fabrice Bellard
    len = s->read_packet(s->opaque, s->buffer, s->buffer_size);
269 abba3dd1 Fabrice Bellard
    if (len <= 0) {
270
        /* do not modify buffer if EOF reached so that a seek back can
271
           be done without rereading data */
272 de6d9b64 Fabrice Bellard
        s->eof_reached = 1;
273 576ae256 Michael Niedermayer
    if(len<0)
274
        s->error= len;
275 abba3dd1 Fabrice Bellard
    } else {
276
        s->pos += len;
277
        s->buf_ptr = s->buffer;
278
        s->buf_end = s->buffer + len;
279 de6d9b64 Fabrice Bellard
    }
280
}
281
282 ee9f36a8 Michael Niedermayer
unsigned long get_checksum(ByteIOContext *s){
283
    s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
284 465e1dad Michael Niedermayer
    s->update_checksum= NULL;
285 ee9f36a8 Michael Niedermayer
    return s->checksum;
286
}
287
288
void init_checksum(ByteIOContext *s, unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len), unsigned long checksum){
289
    s->update_checksum= update_checksum;
290 465e1dad Michael Niedermayer
    if(s->update_checksum){
291
        s->checksum= s->update_checksum(checksum, NULL, 0);
292
        s->checksum_ptr= s->buf_ptr;
293
    }
294 ee9f36a8 Michael Niedermayer
}
295
296 abba3dd1 Fabrice Bellard
/* NOTE: return 0 if EOF, so you cannot use it if EOF handling is
297
   necessary */
298
/* XXX: put an inline version */
299 de6d9b64 Fabrice Bellard
int get_byte(ByteIOContext *s)
300
{
301
    if (s->buf_ptr < s->buf_end) {
302
        return *s->buf_ptr++;
303
    } else {
304
        fill_buffer(s);
305
        if (s->buf_ptr < s->buf_end)
306
            return *s->buf_ptr++;
307
        else
308
            return 0;
309
    }
310
}
311
312 abba3dd1 Fabrice Bellard
/* NOTE: return URL_EOF (-1) if EOF */
313
int url_fgetc(ByteIOContext *s)
314
{
315
    if (s->buf_ptr < s->buf_end) {
316
        return *s->buf_ptr++;
317
    } else {
318
        fill_buffer(s);
319
        if (s->buf_ptr < s->buf_end)
320
            return *s->buf_ptr++;
321
        else
322
            return URL_EOF;
323
    }
324
}
325
326 de6d9b64 Fabrice Bellard
int get_buffer(ByteIOContext *s, unsigned char *buf, int size)
327
{
328
    int len, size1;
329
330
    size1 = size;
331
    while (size > 0) {
332
        len = s->buf_end - s->buf_ptr;
333
        if (len > size)
334
            len = size;
335
        if (len == 0) {
336
            fill_buffer(s);
337
            len = s->buf_end - s->buf_ptr;
338
            if (len == 0)
339
                break;
340
        } else {
341
            memcpy(buf, s->buf_ptr, len);
342
            buf += len;
343
            s->buf_ptr += len;
344
            size -= len;
345
        }
346
    }
347
    return size1 - size;
348
}
349
350 e15dec10 Leon van Stuivenberg
int get_partial_buffer(ByteIOContext *s, unsigned char *buf, int size)
351
{
352
    int len;
353 0ecca7a4 Michael Niedermayer
    
354
    if(size<0)
355
        return -1;
356 e15dec10 Leon van Stuivenberg
357
    len = s->buf_end - s->buf_ptr;
358
    if (len == 0) {
359
        fill_buffer(s);
360
        len = s->buf_end - s->buf_ptr;
361
    }
362
    if (len > size)
363
        len = size;
364
    memcpy(buf, s->buf_ptr, len);
365
    s->buf_ptr += len;
366
    return len;
367
}
368
369 de6d9b64 Fabrice Bellard
unsigned int get_le16(ByteIOContext *s)
370
{
371
    unsigned int val;
372
    val = get_byte(s);
373
    val |= get_byte(s) << 8;
374
    return val;
375
}
376
377
unsigned int get_le32(ByteIOContext *s)
378
{
379
    unsigned int val;
380
    val = get_byte(s);
381
    val |= get_byte(s) << 8;
382
    val |= get_byte(s) << 16;
383
    val |= get_byte(s) << 24;
384
    return val;
385
}
386
387 0c1a9eda Zdenek Kabelac
uint64_t get_le64(ByteIOContext *s)
388 de6d9b64 Fabrice Bellard
{
389 0c1a9eda Zdenek Kabelac
    uint64_t val;
390
    val = (uint64_t)get_le32(s);
391
    val |= (uint64_t)get_le32(s) << 32;
392 de6d9b64 Fabrice Bellard
    return val;
393
}
394
395
unsigned int get_be16(ByteIOContext *s)
396
{
397
    unsigned int val;
398
    val = get_byte(s) << 8;
399
    val |= get_byte(s);
400
    return val;
401
}
402
403
unsigned int get_be32(ByteIOContext *s)
404
{
405
    unsigned int val;
406
    val = get_byte(s) << 24;
407
    val |= get_byte(s) << 16;
408
    val |= get_byte(s) << 8;
409
    val |= get_byte(s);
410
    return val;
411
}
412
413 3b4b29dc Fabrice Bellard
double get_be64_double(ByteIOContext *s)
414 75bdb984 Philip Gladstone
{
415 3b4b29dc Fabrice Bellard
    union {
416
        double d;
417 0c1a9eda Zdenek Kabelac
        uint64_t ull;
418 3b4b29dc Fabrice Bellard
    } u;
419 75bdb984 Philip Gladstone
420 3b4b29dc Fabrice Bellard
    u.ull = get_be64(s);
421
    return u.d;
422 75bdb984 Philip Gladstone
}
423
424 3b4b29dc Fabrice Bellard
char *get_strz(ByteIOContext *s, char *buf, int maxlen)
425 75bdb984 Philip Gladstone
{
426
    int i = 0;
427
    char c;
428
429
    while ((c = get_byte(s))) {
430
        if (i < maxlen-1)
431
            buf[i++] = c;
432
    }
433
    
434
    buf[i] = 0; /* Ensure null terminated, but may be truncated */
435
436
    return buf;
437
}
438
439 0c1a9eda Zdenek Kabelac
uint64_t get_be64(ByteIOContext *s)
440 de6d9b64 Fabrice Bellard
{
441 0c1a9eda Zdenek Kabelac
    uint64_t val;
442
    val = (uint64_t)get_be32(s) << 32;
443
    val |= (uint64_t)get_be32(s);
444 de6d9b64 Fabrice Bellard
    return val;
445
}
446
447
/* link with avio functions */
448
449 764ef400 Mike Melanson
#ifdef CONFIG_ENCODERS
450 576ae256 Michael Niedermayer
static int url_write_packet(void *opaque, uint8_t *buf, int buf_size)
451 de6d9b64 Fabrice Bellard
{
452
    URLContext *h = opaque;
453 576ae256 Michael Niedermayer
    return url_write(h, buf, buf_size);
454 de6d9b64 Fabrice Bellard
}
455 764ef400 Mike Melanson
#else
456
#define        url_write_packet NULL
457
#endif //CONFIG_ENCODERS
458 de6d9b64 Fabrice Bellard
459 0c1a9eda Zdenek Kabelac
static int url_read_packet(void *opaque, uint8_t *buf, int buf_size)
460 de6d9b64 Fabrice Bellard
{
461
    URLContext *h = opaque;
462
    return url_read(h, buf, buf_size);
463
}
464
465 0c1a9eda Zdenek Kabelac
static int url_seek_packet(void *opaque, int64_t offset, int whence)
466 de6d9b64 Fabrice Bellard
{
467
    URLContext *h = opaque;
468 53e2f9ca Michael Niedermayer
    return url_seek(h, offset, whence);
469
    //return 0;
470 de6d9b64 Fabrice Bellard
}
471
472
int url_fdopen(ByteIOContext *s, URLContext *h)
473
{
474 0c1a9eda Zdenek Kabelac
    uint8_t *buffer;
475 abba3dd1 Fabrice Bellard
    int buffer_size, max_packet_size;
476 de6d9b64 Fabrice Bellard
477 abba3dd1 Fabrice Bellard
    
478
    max_packet_size = url_get_max_packet_size(h);
479
    if (max_packet_size) {
480
        buffer_size = max_packet_size; /* no need to bufferize more than one packet */
481
    } else {
482
        buffer_size = IO_BUFFER_SIZE;
483
    }
484 1ea4f593 Fabrice Bellard
    buffer = av_malloc(buffer_size);
485 de6d9b64 Fabrice Bellard
    if (!buffer)
486
        return -ENOMEM;
487
488
    if (init_put_byte(s, buffer, buffer_size, 
489 ac9fe33d Gildas Bazin
                      (h->flags & URL_WRONLY || h->flags & URL_RDWR), h,
490 de6d9b64 Fabrice Bellard
                      url_read_packet, url_write_packet, url_seek_packet) < 0) {
491 1ea4f593 Fabrice Bellard
        av_free(buffer);
492 0bd586c5 Mike Melanson
        return AVERROR_IO;
493 de6d9b64 Fabrice Bellard
    }
494
    s->is_streamed = h->is_streamed;
495 abba3dd1 Fabrice Bellard
    s->max_packet_size = max_packet_size;
496 de6d9b64 Fabrice Bellard
    return 0;
497
}
498
499
/* XXX: must be called before any I/O */
500
int url_setbufsize(ByteIOContext *s, int buf_size)
501
{
502 0c1a9eda Zdenek Kabelac
    uint8_t *buffer;
503 1ea4f593 Fabrice Bellard
    buffer = av_malloc(buf_size);
504 de6d9b64 Fabrice Bellard
    if (!buffer)
505
        return -ENOMEM;
506
507 1ea4f593 Fabrice Bellard
    av_free(s->buffer);
508 de6d9b64 Fabrice Bellard
    s->buffer = buffer;
509
    s->buffer_size = buf_size;
510
    s->buf_ptr = buffer;
511
    if (!s->write_flag) 
512
        s->buf_end = buffer;
513
    else
514
        s->buf_end = buffer + buf_size;
515
    return 0;
516
}
517
518 abba3dd1 Fabrice Bellard
/* NOTE: when opened as read/write, the buffers are only used for
519
   reading */
520 de6d9b64 Fabrice Bellard
int url_fopen(ByteIOContext *s, const char *filename, int flags)
521
{
522
    URLContext *h;
523
    int err;
524
525
    err = url_open(&h, filename, flags);
526
    if (err < 0)
527
        return err;
528
    err = url_fdopen(s, h);
529
    if (err < 0) {
530
        url_close(h);
531
        return err;
532
    }
533
    return 0;
534
}
535
536
int url_fclose(ByteIOContext *s)
537
{
538
    URLContext *h = s->opaque;
539
    
540 1ea4f593 Fabrice Bellard
    av_free(s->buffer);
541 de6d9b64 Fabrice Bellard
    memset(s, 0, sizeof(ByteIOContext));
542
    return url_close(h);
543
}
544
545
URLContext *url_fileno(ByteIOContext *s)
546
{
547
    return s->opaque;
548
}
549
550 764ef400 Mike Melanson
#ifdef CONFIG_ENCODERS
551 abba3dd1 Fabrice Bellard
/* XXX: currently size is limited */
552
int url_fprintf(ByteIOContext *s, const char *fmt, ...)
553
{
554
    va_list ap;
555
    char buf[4096];
556
    int ret;
557
558
    va_start(ap, fmt);
559
    ret = vsnprintf(buf, sizeof(buf), fmt, ap);
560
    va_end(ap);
561
    put_buffer(s, buf, strlen(buf));
562
    return ret;
563
}
564 764ef400 Mike Melanson
#endif //CONFIG_ENCODERS
565 abba3dd1 Fabrice Bellard
566
/* note: unlike fgets, the EOL character is not returned and a whole
567
   line is parsed. return NULL if first char read was EOF */
568
char *url_fgets(ByteIOContext *s, char *buf, int buf_size)
569
{
570
    int c;
571
    char *q;
572
573
    c = url_fgetc(s);
574
    if (c == EOF)
575
        return NULL;
576
    q = buf;
577
    for(;;) {
578
        if (c == EOF || c == '\n')
579
            break;
580
        if ((q - buf) < buf_size - 1)
581
            *q++ = c;
582
        c = url_fgetc(s);
583
    }
584
    if (buf_size > 0)
585
        *q = '\0';
586
    return buf;
587
}
588
589
/* 
590
 * Return the maximum packet size associated to packetized buffered file
591
 * handle. If the file is not packetized (stream like http or file on
592
 * disk), then 0 is returned.
593
 * 
594
 * @param h buffered file handle
595
 * @return maximum packet size in bytes
596
 */
597
int url_fget_max_packet_size(ByteIOContext *s)
598
{
599
    return s->max_packet_size;
600
}
601
602 764ef400 Mike Melanson
#ifdef CONFIG_ENCODERS
603 de6d9b64 Fabrice Bellard
/* buffer handling */
604 0c1a9eda Zdenek Kabelac
int url_open_buf(ByteIOContext *s, uint8_t *buf, int buf_size, int flags)
605 de6d9b64 Fabrice Bellard
{
606
    return init_put_byte(s, buf, buf_size, 
607 ac9fe33d Gildas Bazin
                         (flags & URL_WRONLY || flags & URL_RDWR),
608
                         NULL, NULL, NULL, NULL);
609 de6d9b64 Fabrice Bellard
}
610
611
/* return the written or read size */
612
int url_close_buf(ByteIOContext *s)
613
{
614 abba3dd1 Fabrice Bellard
    put_flush_packet(s);
615 de6d9b64 Fabrice Bellard
    return s->buf_ptr - s->buffer;
616
}
617 abba3dd1 Fabrice Bellard
618
/* output in a dynamic buffer */
619
620
typedef struct DynBuffer {
621
    int pos, size, allocated_size;
622 0c1a9eda Zdenek Kabelac
    uint8_t *buffer;
623 abba3dd1 Fabrice Bellard
    int io_buffer_size;
624 0c1a9eda Zdenek Kabelac
    uint8_t io_buffer[1];
625 abba3dd1 Fabrice Bellard
} DynBuffer;
626
627 576ae256 Michael Niedermayer
static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
628 abba3dd1 Fabrice Bellard
{
629
    DynBuffer *d = opaque;
630
    int new_size, new_allocated_size;
631
    
632
    /* reallocate buffer if needed */
633
    new_size = d->pos + buf_size;
634
    new_allocated_size = d->allocated_size;
635 568e18b1 Michael Niedermayer
    if(new_size < d->pos || new_size > INT_MAX/2)
636
        return -1;
637 abba3dd1 Fabrice Bellard
    while (new_size > new_allocated_size) {
638
        if (!new_allocated_size)
639
            new_allocated_size = new_size;
640
        else
641 568e18b1 Michael Niedermayer
            new_allocated_size += new_allocated_size / 2 + 1;    
642 abba3dd1 Fabrice Bellard
    }
643
    
644
    if (new_allocated_size > d->allocated_size) {
645 b88ba823 Mark Hills
        d->buffer = av_realloc(d->buffer, new_allocated_size);
646
        if(d->buffer == NULL)
647 576ae256 Michael Niedermayer
             return -1234;
648 abba3dd1 Fabrice Bellard
        d->allocated_size = new_allocated_size;
649
    }
650
    memcpy(d->buffer + d->pos, buf, buf_size);
651
    d->pos = new_size;
652
    if (d->pos > d->size)
653
        d->size = d->pos;
654 576ae256 Michael Niedermayer
    return buf_size;
655 abba3dd1 Fabrice Bellard
}
656
657 576ae256 Michael Niedermayer
static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
658 abba3dd1 Fabrice Bellard
{
659
    unsigned char buf1[4];
660 576ae256 Michael Niedermayer
    int ret;
661 abba3dd1 Fabrice Bellard
662
    /* packetized write: output the header */
663
    buf1[0] = (buf_size >> 24);
664
    buf1[1] = (buf_size >> 16);
665
    buf1[2] = (buf_size >> 8);
666
    buf1[3] = (buf_size);
667 576ae256 Michael Niedermayer
    ret= dyn_buf_write(opaque, buf1, 4);
668
    if(ret < 0)
669
        return ret;
670 abba3dd1 Fabrice Bellard
671
    /* then the data */
672 576ae256 Michael Niedermayer
    return dyn_buf_write(opaque, buf, buf_size);
673 abba3dd1 Fabrice Bellard
}
674
675
static int dyn_buf_seek(void *opaque, offset_t offset, int whence)
676
{
677
    DynBuffer *d = opaque;
678
679
    if (whence == SEEK_CUR)
680
        offset += d->pos;
681
    else if (whence == SEEK_END)
682
        offset += d->size;
683
    if (offset < 0 || offset > 0x7fffffffLL)
684
        return -1;
685
    d->pos = offset;
686
    return 0;
687
}
688
689
static int url_open_dyn_buf_internal(ByteIOContext *s, int max_packet_size)
690
{
691
    DynBuffer *d;
692
    int io_buffer_size, ret;
693
    
694
    if (max_packet_size) 
695
        io_buffer_size = max_packet_size;
696
    else
697
        io_buffer_size = 1024;
698
        
699 568e18b1 Michael Niedermayer
    if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
700
        return -1;
701 abba3dd1 Fabrice Bellard
    d = av_malloc(sizeof(DynBuffer) + io_buffer_size);
702
    if (!d)
703
        return -1;
704
    d->io_buffer_size = io_buffer_size;
705
    d->buffer = NULL;
706
    d->pos = 0;
707
    d->size = 0;
708
    d->allocated_size = 0;
709
    ret = init_put_byte(s, d->io_buffer, io_buffer_size, 
710
                        1, d, NULL, 
711
                        max_packet_size ? dyn_packet_buf_write : dyn_buf_write, 
712
                        max_packet_size ? NULL : dyn_buf_seek);
713
    if (ret == 0) {
714
        s->max_packet_size = max_packet_size;
715
    }
716
    return ret;
717
}
718
719
/*
720
 * Open a write only memory stream.
721
 * 
722
 * @param s new IO context
723
 * @return zero if no error.
724
 */
725
int url_open_dyn_buf(ByteIOContext *s)
726
{
727
    return url_open_dyn_buf_internal(s, 0);
728
}
729
730
/*
731
 * Open a write only packetized memory stream with a maximum packet
732
 * size of 'max_packet_size'.  The stream is stored in a memory buffer
733
 * with a big endian 4 byte header giving the packet size in bytes.
734
 * 
735
 * @param s new IO context
736
 * @param max_packet_size maximum packet size (must be > 0) 
737
 * @return zero if no error.
738
 */
739
int url_open_dyn_packet_buf(ByteIOContext *s, int max_packet_size)
740
{
741
    if (max_packet_size <= 0)
742
        return -1;
743
    return url_open_dyn_buf_internal(s, max_packet_size);
744
}
745
746
/* 
747
 * Return the written size and a pointer to the buffer. The buffer
748
 *  must be freed with av_free(). 
749
 * @param s IO context
750
 * @param pointer to a byte buffer
751
 * @return the length of the byte buffer
752
 */
753 0c1a9eda Zdenek Kabelac
int url_close_dyn_buf(ByteIOContext *s, uint8_t **pbuffer)
754 abba3dd1 Fabrice Bellard
{
755
    DynBuffer *d = s->opaque;
756
    int size;
757
758
    put_flush_packet(s);
759
760
    *pbuffer = d->buffer;
761
    size = d->size;
762
    av_free(d);
763
    return size;
764
}
765 764ef400 Mike Melanson
#endif //CONFIG_ENCODERS