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ffmpeg / libavformat / aviobuf.c @ 25f8db58

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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 536ffa59 Wolfram Gloger
                  offset_t (*seek)(void *opaque, offset_t offset, int whence))
33 de6d9b64 Fabrice Bellard
{
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 a9e35095 Diego Biurrun
#ifdef CONFIG_MUXERS
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 a9e35095 Diego Biurrun
#endif //CONFIG_MUXERS
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 a9e35095 Diego Biurrun
#ifdef CONFIG_MUXERS
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 a9e35095 Diego Biurrun
#endif //CONFIG_MUXERS
140 764ef400 Mike Melanson
    {
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 a965c478 Aurelien Jacobs
offset_t url_fsize(ByteIOContext *s)
176
{
177
    offset_t size;
178
    
179
    if (!s->seek)
180
        return -EPIPE;
181
    size = s->seek(s->opaque, -1, SEEK_END) + 1;
182
    s->seek(s->opaque, s->pos, SEEK_SET);
183
    return size;
184
}
185
186 de6d9b64 Fabrice Bellard
int url_feof(ByteIOContext *s)
187
{
188
    return s->eof_reached;
189
}
190
191 576ae256 Michael Niedermayer
int url_ferror(ByteIOContext *s)
192
{
193
    return s->error;
194
}
195
196 a9e35095 Diego Biurrun
#ifdef CONFIG_MUXERS
197 de6d9b64 Fabrice Bellard
void put_le32(ByteIOContext *s, unsigned int val)
198
{
199
    put_byte(s, val);
200
    put_byte(s, val >> 8);
201
    put_byte(s, val >> 16);
202
    put_byte(s, val >> 24);
203
}
204
205
void put_be32(ByteIOContext *s, unsigned int val)
206
{
207
    put_byte(s, val >> 24);
208
    put_byte(s, val >> 16);
209
    put_byte(s, val >> 8);
210
    put_byte(s, val);
211
}
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 a254c574 Michael Niedermayer
void put_be24(ByteIOContext *s, unsigned int val)
246
{
247
    put_be16(s, val >> 8);
248
    put_byte(s, val);
249
}
250
251 0570bf06 Zdenek Kabelac
void put_tag(ByteIOContext *s, const char *tag)
252 de6d9b64 Fabrice Bellard
{
253
    while (*tag) {
254
        put_byte(s, *tag++);
255
    }
256
}
257 a9e35095 Diego Biurrun
#endif //CONFIG_MUXERS
258 de6d9b64 Fabrice Bellard
259
/* Input stream */
260
261
static void fill_buffer(ByteIOContext *s)
262
{
263
    int len;
264
265 abba3dd1 Fabrice Bellard
    /* no need to do anything if EOF already reached */
266
    if (s->eof_reached)
267
        return;
268 ee9f36a8 Michael Niedermayer
269 465e1dad Michael Niedermayer
    if(s->update_checksum){
270 0f0680c5 Michael Niedermayer
        if(s->buf_end > s->checksum_ptr)
271
            s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr);
272 ee9f36a8 Michael Niedermayer
        s->checksum_ptr= s->buffer;
273
    }
274
275 de6d9b64 Fabrice Bellard
    len = s->read_packet(s->opaque, s->buffer, s->buffer_size);
276 abba3dd1 Fabrice Bellard
    if (len <= 0) {
277
        /* do not modify buffer if EOF reached so that a seek back can
278
           be done without rereading data */
279 de6d9b64 Fabrice Bellard
        s->eof_reached = 1;
280 576ae256 Michael Niedermayer
    if(len<0)
281
        s->error= len;
282 abba3dd1 Fabrice Bellard
    } else {
283
        s->pos += len;
284
        s->buf_ptr = s->buffer;
285
        s->buf_end = s->buffer + len;
286 de6d9b64 Fabrice Bellard
    }
287
}
288
289 ee9f36a8 Michael Niedermayer
unsigned long get_checksum(ByteIOContext *s){
290
    s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
291 465e1dad Michael Niedermayer
    s->update_checksum= NULL;
292 ee9f36a8 Michael Niedermayer
    return s->checksum;
293
}
294
295
void init_checksum(ByteIOContext *s, unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len), unsigned long checksum){
296
    s->update_checksum= update_checksum;
297 465e1dad Michael Niedermayer
    if(s->update_checksum){
298
        s->checksum= s->update_checksum(checksum, NULL, 0);
299
        s->checksum_ptr= s->buf_ptr;
300
    }
301 ee9f36a8 Michael Niedermayer
}
302
303 abba3dd1 Fabrice Bellard
/* NOTE: return 0 if EOF, so you cannot use it if EOF handling is
304
   necessary */
305
/* XXX: put an inline version */
306 de6d9b64 Fabrice Bellard
int get_byte(ByteIOContext *s)
307
{
308
    if (s->buf_ptr < s->buf_end) {
309
        return *s->buf_ptr++;
310
    } else {
311
        fill_buffer(s);
312
        if (s->buf_ptr < s->buf_end)
313
            return *s->buf_ptr++;
314
        else
315
            return 0;
316
    }
317
}
318
319 abba3dd1 Fabrice Bellard
/* NOTE: return URL_EOF (-1) if EOF */
320
int url_fgetc(ByteIOContext *s)
321
{
322
    if (s->buf_ptr < s->buf_end) {
323
        return *s->buf_ptr++;
324
    } else {
325
        fill_buffer(s);
326
        if (s->buf_ptr < s->buf_end)
327
            return *s->buf_ptr++;
328
        else
329
            return URL_EOF;
330
    }
331
}
332
333 de6d9b64 Fabrice Bellard
int get_buffer(ByteIOContext *s, unsigned char *buf, int size)
334
{
335
    int len, size1;
336
337
    size1 = size;
338
    while (size > 0) {
339
        len = s->buf_end - s->buf_ptr;
340
        if (len > size)
341
            len = size;
342
        if (len == 0) {
343 3e2b6358 Michael Niedermayer
            if(size > s->buffer_size && !s->update_checksum){
344
                len = s->read_packet(s->opaque, buf, size);
345
                if (len <= 0) {
346
                    /* do not modify buffer if EOF reached so that a seek back can
347
                    be done without rereading data */
348
                    s->eof_reached = 1;
349
                    if(len<0)
350
                        s->error= len;
351
                    break;
352
                } else {
353
                    s->pos += len;
354
                    size -= len;
355
                    buf += len;
356
                    s->buf_ptr = s->buffer;
357
                    s->buf_end = s->buffer/* + len*/;
358
                }
359
            }else{
360
                fill_buffer(s);
361
                len = s->buf_end - s->buf_ptr;
362
                if (len == 0)
363
                    break;
364
            }
365 de6d9b64 Fabrice Bellard
        } else {
366
            memcpy(buf, s->buf_ptr, len);
367
            buf += len;
368
            s->buf_ptr += len;
369
            size -= len;
370
        }
371
    }
372
    return size1 - size;
373
}
374
375 e15dec10 Leon van Stuivenberg
int get_partial_buffer(ByteIOContext *s, unsigned char *buf, int size)
376
{
377
    int len;
378 0ecca7a4 Michael Niedermayer
    
379
    if(size<0)
380
        return -1;
381 e15dec10 Leon van Stuivenberg
382
    len = s->buf_end - s->buf_ptr;
383
    if (len == 0) {
384
        fill_buffer(s);
385
        len = s->buf_end - s->buf_ptr;
386
    }
387
    if (len > size)
388
        len = size;
389
    memcpy(buf, s->buf_ptr, len);
390
    s->buf_ptr += len;
391
    return len;
392
}
393
394 de6d9b64 Fabrice Bellard
unsigned int get_le16(ByteIOContext *s)
395
{
396
    unsigned int val;
397
    val = get_byte(s);
398
    val |= get_byte(s) << 8;
399
    return val;
400
}
401
402
unsigned int get_le32(ByteIOContext *s)
403
{
404
    unsigned int val;
405 a254c574 Michael Niedermayer
    val = get_le16(s);
406
    val |= get_le16(s) << 16;
407 de6d9b64 Fabrice Bellard
    return val;
408
}
409
410 0c1a9eda Zdenek Kabelac
uint64_t get_le64(ByteIOContext *s)
411 de6d9b64 Fabrice Bellard
{
412 0c1a9eda Zdenek Kabelac
    uint64_t val;
413
    val = (uint64_t)get_le32(s);
414
    val |= (uint64_t)get_le32(s) << 32;
415 de6d9b64 Fabrice Bellard
    return val;
416
}
417
418
unsigned int get_be16(ByteIOContext *s)
419
{
420
    unsigned int val;
421
    val = get_byte(s) << 8;
422
    val |= get_byte(s);
423
    return val;
424
}
425
426 a254c574 Michael Niedermayer
unsigned int get_be24(ByteIOContext *s)
427 de6d9b64 Fabrice Bellard
{
428
    unsigned int val;
429 a254c574 Michael Niedermayer
    val = get_be16(s) << 8;
430 de6d9b64 Fabrice Bellard
    val |= get_byte(s);
431
    return val;
432
}
433 a254c574 Michael Niedermayer
unsigned int get_be32(ByteIOContext *s)
434
{
435
    unsigned int val;
436
    val = get_be16(s) << 16;
437
    val |= get_be16(s);
438
    return val;
439
}
440 de6d9b64 Fabrice Bellard
441 3b4b29dc Fabrice Bellard
char *get_strz(ByteIOContext *s, char *buf, int maxlen)
442 75bdb984 Philip Gladstone
{
443
    int i = 0;
444
    char c;
445
446
    while ((c = get_byte(s))) {
447
        if (i < maxlen-1)
448
            buf[i++] = c;
449
    }
450
    
451
    buf[i] = 0; /* Ensure null terminated, but may be truncated */
452
453
    return buf;
454
}
455
456 0c1a9eda Zdenek Kabelac
uint64_t get_be64(ByteIOContext *s)
457 de6d9b64 Fabrice Bellard
{
458 0c1a9eda Zdenek Kabelac
    uint64_t val;
459
    val = (uint64_t)get_be32(s) << 32;
460
    val |= (uint64_t)get_be32(s);
461 de6d9b64 Fabrice Bellard
    return val;
462
}
463
464
/* link with avio functions */
465
466 a9e35095 Diego Biurrun
#ifdef CONFIG_MUXERS
467 576ae256 Michael Niedermayer
static int url_write_packet(void *opaque, uint8_t *buf, int buf_size)
468 de6d9b64 Fabrice Bellard
{
469
    URLContext *h = opaque;
470 576ae256 Michael Niedermayer
    return url_write(h, buf, buf_size);
471 de6d9b64 Fabrice Bellard
}
472 764ef400 Mike Melanson
#else
473
#define        url_write_packet NULL
474 a9e35095 Diego Biurrun
#endif //CONFIG_MUXERS
475 de6d9b64 Fabrice Bellard
476 0c1a9eda Zdenek Kabelac
static int url_read_packet(void *opaque, uint8_t *buf, int buf_size)
477 de6d9b64 Fabrice Bellard
{
478
    URLContext *h = opaque;
479
    return url_read(h, buf, buf_size);
480
}
481
482 536ffa59 Wolfram Gloger
static offset_t url_seek_packet(void *opaque, offset_t offset, int whence)
483 de6d9b64 Fabrice Bellard
{
484
    URLContext *h = opaque;
485 53e2f9ca Michael Niedermayer
    return url_seek(h, offset, whence);
486
    //return 0;
487 de6d9b64 Fabrice Bellard
}
488
489
int url_fdopen(ByteIOContext *s, URLContext *h)
490
{
491 0c1a9eda Zdenek Kabelac
    uint8_t *buffer;
492 abba3dd1 Fabrice Bellard
    int buffer_size, max_packet_size;
493 de6d9b64 Fabrice Bellard
494 abba3dd1 Fabrice Bellard
    
495
    max_packet_size = url_get_max_packet_size(h);
496
    if (max_packet_size) {
497
        buffer_size = max_packet_size; /* no need to bufferize more than one packet */
498
    } else {
499
        buffer_size = IO_BUFFER_SIZE;
500
    }
501 1ea4f593 Fabrice Bellard
    buffer = av_malloc(buffer_size);
502 de6d9b64 Fabrice Bellard
    if (!buffer)
503
        return -ENOMEM;
504
505
    if (init_put_byte(s, buffer, buffer_size, 
506 ac9fe33d Gildas Bazin
                      (h->flags & URL_WRONLY || h->flags & URL_RDWR), h,
507 de6d9b64 Fabrice Bellard
                      url_read_packet, url_write_packet, url_seek_packet) < 0) {
508 1ea4f593 Fabrice Bellard
        av_free(buffer);
509 0bd586c5 Mike Melanson
        return AVERROR_IO;
510 de6d9b64 Fabrice Bellard
    }
511
    s->is_streamed = h->is_streamed;
512 abba3dd1 Fabrice Bellard
    s->max_packet_size = max_packet_size;
513 de6d9b64 Fabrice Bellard
    return 0;
514
}
515
516
/* XXX: must be called before any I/O */
517
int url_setbufsize(ByteIOContext *s, int buf_size)
518
{
519 0c1a9eda Zdenek Kabelac
    uint8_t *buffer;
520 1ea4f593 Fabrice Bellard
    buffer = av_malloc(buf_size);
521 de6d9b64 Fabrice Bellard
    if (!buffer)
522
        return -ENOMEM;
523
524 1ea4f593 Fabrice Bellard
    av_free(s->buffer);
525 de6d9b64 Fabrice Bellard
    s->buffer = buffer;
526
    s->buffer_size = buf_size;
527
    s->buf_ptr = buffer;
528
    if (!s->write_flag) 
529
        s->buf_end = buffer;
530
    else
531
        s->buf_end = buffer + buf_size;
532
    return 0;
533
}
534
535 abba3dd1 Fabrice Bellard
/* NOTE: when opened as read/write, the buffers are only used for
536
   reading */
537 de6d9b64 Fabrice Bellard
int url_fopen(ByteIOContext *s, const char *filename, int flags)
538
{
539
    URLContext *h;
540
    int err;
541
542
    err = url_open(&h, filename, flags);
543
    if (err < 0)
544
        return err;
545
    err = url_fdopen(s, h);
546
    if (err < 0) {
547
        url_close(h);
548
        return err;
549
    }
550
    return 0;
551
}
552
553
int url_fclose(ByteIOContext *s)
554
{
555
    URLContext *h = s->opaque;
556
    
557 1ea4f593 Fabrice Bellard
    av_free(s->buffer);
558 de6d9b64 Fabrice Bellard
    memset(s, 0, sizeof(ByteIOContext));
559
    return url_close(h);
560
}
561
562
URLContext *url_fileno(ByteIOContext *s)
563
{
564
    return s->opaque;
565
}
566
567 a9e35095 Diego Biurrun
#ifdef CONFIG_MUXERS
568 abba3dd1 Fabrice Bellard
/* XXX: currently size is limited */
569
int url_fprintf(ByteIOContext *s, const char *fmt, ...)
570
{
571
    va_list ap;
572
    char buf[4096];
573
    int ret;
574
575
    va_start(ap, fmt);
576
    ret = vsnprintf(buf, sizeof(buf), fmt, ap);
577
    va_end(ap);
578
    put_buffer(s, buf, strlen(buf));
579
    return ret;
580
}
581 a9e35095 Diego Biurrun
#endif //CONFIG_MUXERS
582 abba3dd1 Fabrice Bellard
583
/* note: unlike fgets, the EOL character is not returned and a whole
584
   line is parsed. return NULL if first char read was EOF */
585
char *url_fgets(ByteIOContext *s, char *buf, int buf_size)
586
{
587
    int c;
588
    char *q;
589
590
    c = url_fgetc(s);
591
    if (c == EOF)
592
        return NULL;
593
    q = buf;
594
    for(;;) {
595
        if (c == EOF || c == '\n')
596
            break;
597
        if ((q - buf) < buf_size - 1)
598
            *q++ = c;
599
        c = url_fgetc(s);
600
    }
601
    if (buf_size > 0)
602
        *q = '\0';
603
    return buf;
604
}
605
606
/* 
607
 * Return the maximum packet size associated to packetized buffered file
608
 * handle. If the file is not packetized (stream like http or file on
609
 * disk), then 0 is returned.
610
 * 
611
 * @param h buffered file handle
612
 * @return maximum packet size in bytes
613
 */
614
int url_fget_max_packet_size(ByteIOContext *s)
615
{
616
    return s->max_packet_size;
617
}
618
619 a9e35095 Diego Biurrun
#ifdef CONFIG_MUXERS
620 de6d9b64 Fabrice Bellard
/* buffer handling */
621 0c1a9eda Zdenek Kabelac
int url_open_buf(ByteIOContext *s, uint8_t *buf, int buf_size, int flags)
622 de6d9b64 Fabrice Bellard
{
623
    return init_put_byte(s, buf, buf_size, 
624 ac9fe33d Gildas Bazin
                         (flags & URL_WRONLY || flags & URL_RDWR),
625
                         NULL, NULL, NULL, NULL);
626 de6d9b64 Fabrice Bellard
}
627
628
/* return the written or read size */
629
int url_close_buf(ByteIOContext *s)
630
{
631 abba3dd1 Fabrice Bellard
    put_flush_packet(s);
632 de6d9b64 Fabrice Bellard
    return s->buf_ptr - s->buffer;
633
}
634 abba3dd1 Fabrice Bellard
635
/* output in a dynamic buffer */
636
637
typedef struct DynBuffer {
638
    int pos, size, allocated_size;
639 0c1a9eda Zdenek Kabelac
    uint8_t *buffer;
640 abba3dd1 Fabrice Bellard
    int io_buffer_size;
641 0c1a9eda Zdenek Kabelac
    uint8_t io_buffer[1];
642 abba3dd1 Fabrice Bellard
} DynBuffer;
643
644 576ae256 Michael Niedermayer
static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
645 abba3dd1 Fabrice Bellard
{
646
    DynBuffer *d = opaque;
647
    int new_size, new_allocated_size;
648
    
649
    /* reallocate buffer if needed */
650
    new_size = d->pos + buf_size;
651
    new_allocated_size = d->allocated_size;
652 568e18b1 Michael Niedermayer
    if(new_size < d->pos || new_size > INT_MAX/2)
653
        return -1;
654 abba3dd1 Fabrice Bellard
    while (new_size > new_allocated_size) {
655
        if (!new_allocated_size)
656
            new_allocated_size = new_size;
657
        else
658 568e18b1 Michael Niedermayer
            new_allocated_size += new_allocated_size / 2 + 1;    
659 abba3dd1 Fabrice Bellard
    }
660
    
661
    if (new_allocated_size > d->allocated_size) {
662 b88ba823 Mark Hills
        d->buffer = av_realloc(d->buffer, new_allocated_size);
663
        if(d->buffer == NULL)
664 576ae256 Michael Niedermayer
             return -1234;
665 abba3dd1 Fabrice Bellard
        d->allocated_size = new_allocated_size;
666
    }
667
    memcpy(d->buffer + d->pos, buf, buf_size);
668
    d->pos = new_size;
669
    if (d->pos > d->size)
670
        d->size = d->pos;
671 576ae256 Michael Niedermayer
    return buf_size;
672 abba3dd1 Fabrice Bellard
}
673
674 576ae256 Michael Niedermayer
static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
675 abba3dd1 Fabrice Bellard
{
676
    unsigned char buf1[4];
677 576ae256 Michael Niedermayer
    int ret;
678 abba3dd1 Fabrice Bellard
679
    /* packetized write: output the header */
680
    buf1[0] = (buf_size >> 24);
681
    buf1[1] = (buf_size >> 16);
682
    buf1[2] = (buf_size >> 8);
683
    buf1[3] = (buf_size);
684 576ae256 Michael Niedermayer
    ret= dyn_buf_write(opaque, buf1, 4);
685
    if(ret < 0)
686
        return ret;
687 abba3dd1 Fabrice Bellard
688
    /* then the data */
689 576ae256 Michael Niedermayer
    return dyn_buf_write(opaque, buf, buf_size);
690 abba3dd1 Fabrice Bellard
}
691
692 536ffa59 Wolfram Gloger
static offset_t dyn_buf_seek(void *opaque, offset_t offset, int whence)
693 abba3dd1 Fabrice Bellard
{
694
    DynBuffer *d = opaque;
695
696
    if (whence == SEEK_CUR)
697
        offset += d->pos;
698
    else if (whence == SEEK_END)
699
        offset += d->size;
700
    if (offset < 0 || offset > 0x7fffffffLL)
701
        return -1;
702
    d->pos = offset;
703
    return 0;
704
}
705
706
static int url_open_dyn_buf_internal(ByteIOContext *s, int max_packet_size)
707
{
708
    DynBuffer *d;
709
    int io_buffer_size, ret;
710
    
711
    if (max_packet_size) 
712
        io_buffer_size = max_packet_size;
713
    else
714
        io_buffer_size = 1024;
715
        
716 568e18b1 Michael Niedermayer
    if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
717
        return -1;
718 abba3dd1 Fabrice Bellard
    d = av_malloc(sizeof(DynBuffer) + io_buffer_size);
719
    if (!d)
720
        return -1;
721
    d->io_buffer_size = io_buffer_size;
722
    d->buffer = NULL;
723
    d->pos = 0;
724
    d->size = 0;
725
    d->allocated_size = 0;
726
    ret = init_put_byte(s, d->io_buffer, io_buffer_size, 
727
                        1, d, NULL, 
728
                        max_packet_size ? dyn_packet_buf_write : dyn_buf_write, 
729
                        max_packet_size ? NULL : dyn_buf_seek);
730
    if (ret == 0) {
731
        s->max_packet_size = max_packet_size;
732
    }
733
    return ret;
734
}
735
736
/*
737
 * Open a write only memory stream.
738
 * 
739
 * @param s new IO context
740
 * @return zero if no error.
741
 */
742
int url_open_dyn_buf(ByteIOContext *s)
743
{
744
    return url_open_dyn_buf_internal(s, 0);
745
}
746
747
/*
748
 * Open a write only packetized memory stream with a maximum packet
749
 * size of 'max_packet_size'.  The stream is stored in a memory buffer
750
 * with a big endian 4 byte header giving the packet size in bytes.
751
 * 
752
 * @param s new IO context
753
 * @param max_packet_size maximum packet size (must be > 0) 
754
 * @return zero if no error.
755
 */
756
int url_open_dyn_packet_buf(ByteIOContext *s, int max_packet_size)
757
{
758
    if (max_packet_size <= 0)
759
        return -1;
760
    return url_open_dyn_buf_internal(s, max_packet_size);
761
}
762
763
/* 
764
 * Return the written size and a pointer to the buffer. The buffer
765
 *  must be freed with av_free(). 
766
 * @param s IO context
767
 * @param pointer to a byte buffer
768
 * @return the length of the byte buffer
769
 */
770 0c1a9eda Zdenek Kabelac
int url_close_dyn_buf(ByteIOContext *s, uint8_t **pbuffer)
771 abba3dd1 Fabrice Bellard
{
772
    DynBuffer *d = s->opaque;
773
    int size;
774
775
    put_flush_packet(s);
776
777
    *pbuffer = d->buffer;
778
    size = d->size;
779
    av_free(d);
780
    return size;
781
}
782 a9e35095 Diego Biurrun
#endif //CONFIG_MUXERS