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ffmpeg / libavformat / aviobuf.c @ 1ae7518d

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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 b78e7197 Diego Biurrun
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8 19720f15 Fabrice Bellard
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10 b78e7197 Diego Biurrun
 * version 2.1 of the License, or (at your option) any later version.
11 de6d9b64 Fabrice Bellard
 *
12 b78e7197 Diego Biurrun
 * FFmpeg is distributed in the hope that it will be useful,
13 de6d9b64 Fabrice Bellard
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 19720f15 Fabrice Bellard
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16 de6d9b64 Fabrice Bellard
 *
17 19720f15 Fabrice Bellard
 * You should have received a copy of the GNU Lesser General Public
18 b78e7197 Diego Biurrun
 * License along with FFmpeg; if not, write to the Free Software
19 5509bffa Diego Biurrun
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 de6d9b64 Fabrice Bellard
 */
21
#include "avformat.h"
22 5c91a675 Zdenek Kabelac
#include "avio.h"
23 abba3dd1 Fabrice Bellard
#include <stdarg.h>
24 de6d9b64 Fabrice Bellard
25
#define IO_BUFFER_SIZE 32768
26
27 398f5d3f Michael Niedermayer
static void fill_buffer(ByteIOContext *s);
28
29 de6d9b64 Fabrice Bellard
int init_put_byte(ByteIOContext *s,
30
                  unsigned char *buffer,
31
                  int buffer_size,
32
                  int write_flag,
33
                  void *opaque,
34 0c1a9eda Zdenek Kabelac
                  int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
35 576ae256 Michael Niedermayer
                  int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
36 536ffa59 Wolfram Gloger
                  offset_t (*seek)(void *opaque, offset_t offset, int whence))
37 de6d9b64 Fabrice Bellard
{
38
    s->buffer = buffer;
39
    s->buffer_size = buffer_size;
40
    s->buf_ptr = buffer;
41
    s->write_flag = write_flag;
42 115329f1 Diego Biurrun
    if (!s->write_flag)
43 de6d9b64 Fabrice Bellard
        s->buf_end = buffer;
44
    else
45
        s->buf_end = buffer + buffer_size;
46
    s->opaque = opaque;
47
    s->write_packet = write_packet;
48
    s->read_packet = read_packet;
49
    s->seek = seek;
50
    s->pos = 0;
51
    s->must_flush = 0;
52
    s->eof_reached = 0;
53 576ae256 Michael Niedermayer
    s->error = 0;
54 de6d9b64 Fabrice Bellard
    s->is_streamed = 0;
55 abba3dd1 Fabrice Bellard
    s->max_packet_size = 0;
56 ee9f36a8 Michael Niedermayer
    s->update_checksum= NULL;
57 942f3bb5 Michael Niedermayer
    if(!read_packet && !write_flag){
58
        s->pos = buffer_size;
59
        s->buf_end = s->buffer + buffer_size;
60
    }
61 de6d9b64 Fabrice Bellard
    return 0;
62
}
63 115329f1 Diego Biurrun
64 de6d9b64 Fabrice Bellard
static void flush_buffer(ByteIOContext *s)
65
{
66
    if (s->buf_ptr > s->buffer) {
67 576ae256 Michael Niedermayer
        if (s->write_packet && !s->error){
68
            int ret= s->write_packet(s->opaque, s->buffer, s->buf_ptr - s->buffer);
69
            if(ret < 0){
70
                s->error = ret;
71
            }
72
        }
73 465e1dad Michael Niedermayer
        if(s->update_checksum){
74 ee9f36a8 Michael Niedermayer
            s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
75
            s->checksum_ptr= s->buffer;
76
        }
77 de6d9b64 Fabrice Bellard
        s->pos += s->buf_ptr - s->buffer;
78
    }
79
    s->buf_ptr = s->buffer;
80
}
81
82
void put_byte(ByteIOContext *s, int b)
83
{
84
    *(s->buf_ptr)++ = b;
85 115329f1 Diego Biurrun
    if (s->buf_ptr >= s->buf_end)
86 de6d9b64 Fabrice Bellard
        flush_buffer(s);
87
}
88
89 75bdb984 Philip Gladstone
void put_buffer(ByteIOContext *s, const unsigned char *buf, int size)
90 de6d9b64 Fabrice Bellard
{
91
    int len;
92
93
    while (size > 0) {
94
        len = (s->buf_end - s->buf_ptr);
95
        if (len > size)
96
            len = size;
97
        memcpy(s->buf_ptr, buf, len);
98
        s->buf_ptr += len;
99
100 115329f1 Diego Biurrun
        if (s->buf_ptr >= s->buf_end)
101 de6d9b64 Fabrice Bellard
            flush_buffer(s);
102
103
        buf += len;
104
        size -= len;
105
    }
106
}
107
108
void put_flush_packet(ByteIOContext *s)
109
{
110
    flush_buffer(s);
111
    s->must_flush = 0;
112
}
113
114
offset_t url_fseek(ByteIOContext *s, offset_t offset, int whence)
115
{
116
    offset_t offset1;
117 f40d1739 Michael Niedermayer
    offset_t pos= s->pos - (s->write_flag ? 0 : (s->buf_end - s->buffer));
118 de6d9b64 Fabrice Bellard
119
    if (whence != SEEK_CUR && whence != SEEK_SET)
120
        return -EINVAL;
121 115329f1 Diego Biurrun
122 f40d1739 Michael Niedermayer
    if (whence == SEEK_CUR) {
123
        offset1 = pos + (s->buf_ptr - s->buffer);
124
        if (offset == 0)
125
            return offset1;
126
        offset += offset1;
127
    }
128
    offset1 = offset - pos;
129
    if (!s->must_flush &&
130
        offset1 >= 0 && offset1 < (s->buf_end - s->buffer)) {
131
        /* can do the seek inside the buffer */
132
        s->buf_ptr = s->buffer + offset1;
133 398f5d3f Michael Niedermayer
    } else if(s->is_streamed && !s->write_flag &&
134
              offset1 >= 0 && offset1 < (s->buf_end - s->buffer) + (1<<16)){
135
        while(s->pos < offset && !s->eof_reached)
136
            fill_buffer(s);
137
        s->buf_ptr = s->buf_end + offset - s->pos;
138 f40d1739 Michael Niedermayer
    } else {
139 8fa641f8 Loïc Le Loarer
#if defined(CONFIG_MUXERS) || defined(CONFIG_NETWORK)
140 f40d1739 Michael Niedermayer
        if (s->write_flag) {
141 de6d9b64 Fabrice Bellard
            flush_buffer(s);
142
            s->must_flush = 1;
143 f40d1739 Michael Niedermayer
        } else
144 8fa641f8 Loïc Le Loarer
#endif /* defined(CONFIG_MUXERS) || defined(CONFIG_NETWORK) */
145 f40d1739 Michael Niedermayer
        {
146 de6d9b64 Fabrice Bellard
            s->buf_end = s->buffer;
147
        }
148 f40d1739 Michael Niedermayer
        s->buf_ptr = s->buffer;
149 3b9a913d Michael Niedermayer
        if (!s->seek || s->seek(s->opaque, offset, SEEK_SET) == (offset_t)-EPIPE)
150 f40d1739 Michael Niedermayer
            return -EPIPE;
151
        s->pos = offset;
152 de6d9b64 Fabrice Bellard
    }
153 f40d1739 Michael Niedermayer
    s->eof_reached = 0;
154 de6d9b64 Fabrice Bellard
    return offset;
155
}
156
157
void url_fskip(ByteIOContext *s, offset_t offset)
158
{
159
    url_fseek(s, offset, SEEK_CUR);
160
}
161
162
offset_t url_ftell(ByteIOContext *s)
163
{
164
    return url_fseek(s, 0, SEEK_CUR);
165
}
166
167 a965c478 Aurelien Jacobs
offset_t url_fsize(ByteIOContext *s)
168
{
169
    offset_t size;
170 115329f1 Diego Biurrun
171 a965c478 Aurelien Jacobs
    if (!s->seek)
172
        return -EPIPE;
173 8e287af0 Michael Niedermayer
    size = s->seek(s->opaque, 0, AVSEEK_SIZE);
174
    if(size<0){
175 1ae2c5f2 Michael Niedermayer
        size = s->seek(s->opaque, -1, SEEK_END) + 1;
176
        s->seek(s->opaque, s->pos, SEEK_SET);
177 8e287af0 Michael Niedermayer
    }
178 a965c478 Aurelien Jacobs
    return size;
179
}
180
181 de6d9b64 Fabrice Bellard
int url_feof(ByteIOContext *s)
182
{
183
    return s->eof_reached;
184
}
185
186 576ae256 Michael Niedermayer
int url_ferror(ByteIOContext *s)
187
{
188
    return s->error;
189
}
190
191 de6d9b64 Fabrice Bellard
void put_le32(ByteIOContext *s, unsigned int val)
192
{
193
    put_byte(s, val);
194
    put_byte(s, val >> 8);
195
    put_byte(s, val >> 16);
196
    put_byte(s, val >> 24);
197
}
198
199
void put_be32(ByteIOContext *s, unsigned int val)
200
{
201
    put_byte(s, val >> 24);
202
    put_byte(s, val >> 16);
203
    put_byte(s, val >> 8);
204
    put_byte(s, val);
205
}
206
207 3b4b29dc Fabrice Bellard
void put_strz(ByteIOContext *s, const char *str)
208 75bdb984 Philip Gladstone
{
209
    if (str)
210
        put_buffer(s, (const unsigned char *) str, strlen(str) + 1);
211
    else
212
        put_byte(s, 0);
213
}
214
215 0c1a9eda Zdenek Kabelac
void put_le64(ByteIOContext *s, uint64_t val)
216 de6d9b64 Fabrice Bellard
{
217 0c1a9eda Zdenek Kabelac
    put_le32(s, (uint32_t)(val & 0xffffffff));
218
    put_le32(s, (uint32_t)(val >> 32));
219 de6d9b64 Fabrice Bellard
}
220
221 0c1a9eda Zdenek Kabelac
void put_be64(ByteIOContext *s, uint64_t val)
222 de6d9b64 Fabrice Bellard
{
223 0c1a9eda Zdenek Kabelac
    put_be32(s, (uint32_t)(val >> 32));
224
    put_be32(s, (uint32_t)(val & 0xffffffff));
225 de6d9b64 Fabrice Bellard
}
226
227
void put_le16(ByteIOContext *s, unsigned int val)
228
{
229
    put_byte(s, val);
230
    put_byte(s, val >> 8);
231
}
232
233
void put_be16(ByteIOContext *s, unsigned int val)
234
{
235
    put_byte(s, val >> 8);
236
    put_byte(s, val);
237
}
238
239 ea395e8c Aurelien Jacobs
void put_le24(ByteIOContext *s, unsigned int val)
240
{
241
    put_le16(s, val & 0xffff);
242
    put_byte(s, val >> 16);
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
258
/* Input stream */
259
260
static void fill_buffer(ByteIOContext *s)
261
{
262
    int len;
263
264 abba3dd1 Fabrice Bellard
    /* no need to do anything if EOF already reached */
265
    if (s->eof_reached)
266
        return;
267 ee9f36a8 Michael Niedermayer
268 465e1dad Michael Niedermayer
    if(s->update_checksum){
269 0f0680c5 Michael Niedermayer
        if(s->buf_end > s->checksum_ptr)
270
            s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr);
271 ee9f36a8 Michael Niedermayer
        s->checksum_ptr= s->buffer;
272
    }
273
274 de6d9b64 Fabrice Bellard
    len = s->read_packet(s->opaque, s->buffer, s->buffer_size);
275 abba3dd1 Fabrice Bellard
    if (len <= 0) {
276
        /* do not modify buffer if EOF reached so that a seek back can
277
           be done without rereading data */
278 de6d9b64 Fabrice Bellard
        s->eof_reached = 1;
279 576ae256 Michael Niedermayer
    if(len<0)
280
        s->error= len;
281 abba3dd1 Fabrice Bellard
    } else {
282
        s->pos += len;
283
        s->buf_ptr = s->buffer;
284
        s->buf_end = s->buffer + len;
285 de6d9b64 Fabrice Bellard
    }
286
}
287
288 ee9f36a8 Michael Niedermayer
unsigned long get_checksum(ByteIOContext *s){
289
    s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
290 465e1dad Michael Niedermayer
    s->update_checksum= NULL;
291 ee9f36a8 Michael Niedermayer
    return s->checksum;
292
}
293
294
void init_checksum(ByteIOContext *s, unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len), unsigned long checksum){
295
    s->update_checksum= update_checksum;
296 465e1dad Michael Niedermayer
    if(s->update_checksum){
297 ccb15994 Michael Niedermayer
        s->checksum= checksum;
298 465e1dad Michael Niedermayer
        s->checksum_ptr= s->buf_ptr;
299
    }
300 ee9f36a8 Michael Niedermayer
}
301
302 abba3dd1 Fabrice Bellard
/* NOTE: return 0 if EOF, so you cannot use it if EOF handling is
303
   necessary */
304
/* XXX: put an inline version */
305 de6d9b64 Fabrice Bellard
int get_byte(ByteIOContext *s)
306
{
307
    if (s->buf_ptr < s->buf_end) {
308
        return *s->buf_ptr++;
309
    } else {
310
        fill_buffer(s);
311
        if (s->buf_ptr < s->buf_end)
312
            return *s->buf_ptr++;
313
        else
314
            return 0;
315
    }
316
}
317
318 abba3dd1 Fabrice Bellard
/* NOTE: return URL_EOF (-1) if EOF */
319
int url_fgetc(ByteIOContext *s)
320
{
321
    if (s->buf_ptr < s->buf_end) {
322
        return *s->buf_ptr++;
323
    } else {
324
        fill_buffer(s);
325
        if (s->buf_ptr < s->buf_end)
326
            return *s->buf_ptr++;
327
        else
328
            return URL_EOF;
329
    }
330
}
331
332 de6d9b64 Fabrice Bellard
int get_buffer(ByteIOContext *s, unsigned char *buf, int size)
333
{
334
    int len, size1;
335
336
    size1 = size;
337
    while (size > 0) {
338
        len = s->buf_end - s->buf_ptr;
339
        if (len > size)
340
            len = size;
341
        if (len == 0) {
342 3e2b6358 Michael Niedermayer
            if(size > s->buffer_size && !s->update_checksum){
343
                len = s->read_packet(s->opaque, buf, size);
344
                if (len <= 0) {
345
                    /* do not modify buffer if EOF reached so that a seek back can
346
                    be done without rereading data */
347
                    s->eof_reached = 1;
348
                    if(len<0)
349
                        s->error= len;
350
                    break;
351
                } else {
352
                    s->pos += len;
353
                    size -= len;
354
                    buf += len;
355
                    s->buf_ptr = s->buffer;
356
                    s->buf_end = s->buffer/* + len*/;
357
                }
358
            }else{
359
                fill_buffer(s);
360
                len = s->buf_end - s->buf_ptr;
361
                if (len == 0)
362
                    break;
363
            }
364 de6d9b64 Fabrice Bellard
        } else {
365
            memcpy(buf, s->buf_ptr, len);
366
            buf += len;
367
            s->buf_ptr += len;
368
            size -= len;
369
        }
370
    }
371
    return size1 - size;
372
}
373
374 e15dec10 Leon van Stuivenberg
int get_partial_buffer(ByteIOContext *s, unsigned char *buf, int size)
375
{
376
    int len;
377 115329f1 Diego Biurrun
378 0ecca7a4 Michael Niedermayer
    if(size<0)
379
        return -1;
380 e15dec10 Leon van Stuivenberg
381
    len = s->buf_end - s->buf_ptr;
382
    if (len == 0) {
383
        fill_buffer(s);
384
        len = s->buf_end - s->buf_ptr;
385
    }
386
    if (len > size)
387
        len = size;
388
    memcpy(buf, s->buf_ptr, len);
389
    s->buf_ptr += len;
390
    return len;
391
}
392
393 de6d9b64 Fabrice Bellard
unsigned int get_le16(ByteIOContext *s)
394
{
395
    unsigned int val;
396
    val = get_byte(s);
397
    val |= get_byte(s) << 8;
398
    return val;
399
}
400
401 ea395e8c Aurelien Jacobs
unsigned int get_le24(ByteIOContext *s)
402
{
403
    unsigned int val;
404
    val = get_le16(s);
405
    val |= get_byte(s) << 16;
406
    return val;
407
}
408
409 de6d9b64 Fabrice Bellard
unsigned int get_le32(ByteIOContext *s)
410
{
411
    unsigned int val;
412 a254c574 Michael Niedermayer
    val = get_le16(s);
413
    val |= get_le16(s) << 16;
414 de6d9b64 Fabrice Bellard
    return val;
415
}
416
417 0c1a9eda Zdenek Kabelac
uint64_t get_le64(ByteIOContext *s)
418 de6d9b64 Fabrice Bellard
{
419 0c1a9eda Zdenek Kabelac
    uint64_t val;
420
    val = (uint64_t)get_le32(s);
421
    val |= (uint64_t)get_le32(s) << 32;
422 de6d9b64 Fabrice Bellard
    return val;
423
}
424
425
unsigned int get_be16(ByteIOContext *s)
426
{
427
    unsigned int val;
428
    val = get_byte(s) << 8;
429
    val |= get_byte(s);
430
    return val;
431
}
432
433 a254c574 Michael Niedermayer
unsigned int get_be24(ByteIOContext *s)
434 de6d9b64 Fabrice Bellard
{
435
    unsigned int val;
436 a254c574 Michael Niedermayer
    val = get_be16(s) << 8;
437 de6d9b64 Fabrice Bellard
    val |= get_byte(s);
438
    return val;
439
}
440 a254c574 Michael Niedermayer
unsigned int get_be32(ByteIOContext *s)
441
{
442
    unsigned int val;
443
    val = get_be16(s) << 16;
444
    val |= get_be16(s);
445
    return val;
446
}
447 de6d9b64 Fabrice Bellard
448 3b4b29dc Fabrice Bellard
char *get_strz(ByteIOContext *s, char *buf, int maxlen)
449 75bdb984 Philip Gladstone
{
450
    int i = 0;
451
    char c;
452
453
    while ((c = get_byte(s))) {
454
        if (i < maxlen-1)
455
            buf[i++] = c;
456
    }
457 115329f1 Diego Biurrun
458 75bdb984 Philip Gladstone
    buf[i] = 0; /* Ensure null terminated, but may be truncated */
459
460
    return buf;
461
}
462
463 0c1a9eda Zdenek Kabelac
uint64_t get_be64(ByteIOContext *s)
464 de6d9b64 Fabrice Bellard
{
465 0c1a9eda Zdenek Kabelac
    uint64_t val;
466
    val = (uint64_t)get_be32(s) << 32;
467
    val |= (uint64_t)get_be32(s);
468 de6d9b64 Fabrice Bellard
    return val;
469
}
470
471
/* link with avio functions */
472
473 a9e35095 Diego Biurrun
#ifdef CONFIG_MUXERS
474 576ae256 Michael Niedermayer
static int url_write_packet(void *opaque, uint8_t *buf, int buf_size)
475 de6d9b64 Fabrice Bellard
{
476
    URLContext *h = opaque;
477 576ae256 Michael Niedermayer
    return url_write(h, buf, buf_size);
478 de6d9b64 Fabrice Bellard
}
479 764ef400 Mike Melanson
#else
480 bb270c08 Diego Biurrun
#define         url_write_packet NULL
481 a9e35095 Diego Biurrun
#endif //CONFIG_MUXERS
482 de6d9b64 Fabrice Bellard
483 0c1a9eda Zdenek Kabelac
static int url_read_packet(void *opaque, uint8_t *buf, int buf_size)
484 de6d9b64 Fabrice Bellard
{
485
    URLContext *h = opaque;
486
    return url_read(h, buf, buf_size);
487
}
488
489 536ffa59 Wolfram Gloger
static offset_t url_seek_packet(void *opaque, offset_t offset, int whence)
490 de6d9b64 Fabrice Bellard
{
491
    URLContext *h = opaque;
492 53e2f9ca Michael Niedermayer
    return url_seek(h, offset, whence);
493
    //return 0;
494 de6d9b64 Fabrice Bellard
}
495
496
int url_fdopen(ByteIOContext *s, URLContext *h)
497
{
498 0c1a9eda Zdenek Kabelac
    uint8_t *buffer;
499 abba3dd1 Fabrice Bellard
    int buffer_size, max_packet_size;
500 de6d9b64 Fabrice Bellard
501 115329f1 Diego Biurrun
502 abba3dd1 Fabrice Bellard
    max_packet_size = url_get_max_packet_size(h);
503
    if (max_packet_size) {
504
        buffer_size = max_packet_size; /* no need to bufferize more than one packet */
505
    } else {
506
        buffer_size = IO_BUFFER_SIZE;
507
    }
508 1ea4f593 Fabrice Bellard
    buffer = av_malloc(buffer_size);
509 de6d9b64 Fabrice Bellard
    if (!buffer)
510
        return -ENOMEM;
511
512 115329f1 Diego Biurrun
    if (init_put_byte(s, buffer, buffer_size,
513 ac9fe33d Gildas Bazin
                      (h->flags & URL_WRONLY || h->flags & URL_RDWR), h,
514 de6d9b64 Fabrice Bellard
                      url_read_packet, url_write_packet, url_seek_packet) < 0) {
515 1ea4f593 Fabrice Bellard
        av_free(buffer);
516 0bd586c5 Mike Melanson
        return AVERROR_IO;
517 de6d9b64 Fabrice Bellard
    }
518
    s->is_streamed = h->is_streamed;
519 abba3dd1 Fabrice Bellard
    s->max_packet_size = max_packet_size;
520 de6d9b64 Fabrice Bellard
    return 0;
521
}
522
523
/* XXX: must be called before any I/O */
524
int url_setbufsize(ByteIOContext *s, int buf_size)
525
{
526 0c1a9eda Zdenek Kabelac
    uint8_t *buffer;
527 1ea4f593 Fabrice Bellard
    buffer = av_malloc(buf_size);
528 de6d9b64 Fabrice Bellard
    if (!buffer)
529
        return -ENOMEM;
530
531 1ea4f593 Fabrice Bellard
    av_free(s->buffer);
532 de6d9b64 Fabrice Bellard
    s->buffer = buffer;
533
    s->buffer_size = buf_size;
534
    s->buf_ptr = buffer;
535 115329f1 Diego Biurrun
    if (!s->write_flag)
536 de6d9b64 Fabrice Bellard
        s->buf_end = buffer;
537
    else
538
        s->buf_end = buffer + buf_size;
539
    return 0;
540
}
541
542 abba3dd1 Fabrice Bellard
/* NOTE: when opened as read/write, the buffers are only used for
543
   reading */
544 de6d9b64 Fabrice Bellard
int url_fopen(ByteIOContext *s, const char *filename, int flags)
545
{
546
    URLContext *h;
547
    int err;
548
549
    err = url_open(&h, filename, flags);
550
    if (err < 0)
551
        return err;
552
    err = url_fdopen(s, h);
553
    if (err < 0) {
554
        url_close(h);
555
        return err;
556
    }
557
    return 0;
558
}
559
560
int url_fclose(ByteIOContext *s)
561
{
562
    URLContext *h = s->opaque;
563 115329f1 Diego Biurrun
564 1ea4f593 Fabrice Bellard
    av_free(s->buffer);
565 de6d9b64 Fabrice Bellard
    memset(s, 0, sizeof(ByteIOContext));
566
    return url_close(h);
567
}
568
569
URLContext *url_fileno(ByteIOContext *s)
570
{
571
    return s->opaque;
572
}
573
574 a9e35095 Diego Biurrun
#ifdef CONFIG_MUXERS
575 abba3dd1 Fabrice Bellard
/* XXX: currently size is limited */
576
int url_fprintf(ByteIOContext *s, const char *fmt, ...)
577
{
578
    va_list ap;
579
    char buf[4096];
580
    int ret;
581
582
    va_start(ap, fmt);
583
    ret = vsnprintf(buf, sizeof(buf), fmt, ap);
584
    va_end(ap);
585
    put_buffer(s, buf, strlen(buf));
586
    return ret;
587
}
588 a9e35095 Diego Biurrun
#endif //CONFIG_MUXERS
589 abba3dd1 Fabrice Bellard
590
/* note: unlike fgets, the EOL character is not returned and a whole
591
   line is parsed. return NULL if first char read was EOF */
592
char *url_fgets(ByteIOContext *s, char *buf, int buf_size)
593
{
594
    int c;
595
    char *q;
596
597
    c = url_fgetc(s);
598
    if (c == EOF)
599
        return NULL;
600
    q = buf;
601
    for(;;) {
602
        if (c == EOF || c == '\n')
603
            break;
604
        if ((q - buf) < buf_size - 1)
605
            *q++ = c;
606
        c = url_fgetc(s);
607
    }
608
    if (buf_size > 0)
609
        *q = '\0';
610
    return buf;
611
}
612
613 115329f1 Diego Biurrun
/*
614 abba3dd1 Fabrice Bellard
 * Return the maximum packet size associated to packetized buffered file
615
 * handle. If the file is not packetized (stream like http or file on
616
 * disk), then 0 is returned.
617 115329f1 Diego Biurrun
 *
618 abba3dd1 Fabrice Bellard
 * @param h buffered file handle
619
 * @return maximum packet size in bytes
620
 */
621
int url_fget_max_packet_size(ByteIOContext *s)
622
{
623
    return s->max_packet_size;
624
}
625
626 8fa641f8 Loïc Le Loarer
/* url_open_dyn_buf and url_close_dyn_buf are used in rtp.c to send a response
627
 * back to the server even if CONFIG_MUXERS is not set. */
628
#if defined(CONFIG_MUXERS) || defined(CONFIG_NETWORK)
629 de6d9b64 Fabrice Bellard
/* buffer handling */
630 0c1a9eda Zdenek Kabelac
int url_open_buf(ByteIOContext *s, uint8_t *buf, int buf_size, int flags)
631 de6d9b64 Fabrice Bellard
{
632 115329f1 Diego Biurrun
    return init_put_byte(s, buf, buf_size,
633 ac9fe33d Gildas Bazin
                         (flags & URL_WRONLY || flags & URL_RDWR),
634
                         NULL, NULL, NULL, NULL);
635 de6d9b64 Fabrice Bellard
}
636
637
/* return the written or read size */
638
int url_close_buf(ByteIOContext *s)
639
{
640 abba3dd1 Fabrice Bellard
    put_flush_packet(s);
641 de6d9b64 Fabrice Bellard
    return s->buf_ptr - s->buffer;
642
}
643 abba3dd1 Fabrice Bellard
644
/* output in a dynamic buffer */
645
646
typedef struct DynBuffer {
647
    int pos, size, allocated_size;
648 0c1a9eda Zdenek Kabelac
    uint8_t *buffer;
649 abba3dd1 Fabrice Bellard
    int io_buffer_size;
650 0c1a9eda Zdenek Kabelac
    uint8_t io_buffer[1];
651 abba3dd1 Fabrice Bellard
} DynBuffer;
652
653 576ae256 Michael Niedermayer
static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
654 abba3dd1 Fabrice Bellard
{
655
    DynBuffer *d = opaque;
656
    int new_size, new_allocated_size;
657 115329f1 Diego Biurrun
658 abba3dd1 Fabrice Bellard
    /* reallocate buffer if needed */
659
    new_size = d->pos + buf_size;
660
    new_allocated_size = d->allocated_size;
661 568e18b1 Michael Niedermayer
    if(new_size < d->pos || new_size > INT_MAX/2)
662
        return -1;
663 abba3dd1 Fabrice Bellard
    while (new_size > new_allocated_size) {
664
        if (!new_allocated_size)
665
            new_allocated_size = new_size;
666
        else
667 115329f1 Diego Biurrun
            new_allocated_size += new_allocated_size / 2 + 1;
668 abba3dd1 Fabrice Bellard
    }
669 115329f1 Diego Biurrun
670 abba3dd1 Fabrice Bellard
    if (new_allocated_size > d->allocated_size) {
671 b88ba823 Mark Hills
        d->buffer = av_realloc(d->buffer, new_allocated_size);
672
        if(d->buffer == NULL)
673 576ae256 Michael Niedermayer
             return -1234;
674 abba3dd1 Fabrice Bellard
        d->allocated_size = new_allocated_size;
675
    }
676
    memcpy(d->buffer + d->pos, buf, buf_size);
677
    d->pos = new_size;
678
    if (d->pos > d->size)
679
        d->size = d->pos;
680 576ae256 Michael Niedermayer
    return buf_size;
681 abba3dd1 Fabrice Bellard
}
682
683 576ae256 Michael Niedermayer
static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
684 abba3dd1 Fabrice Bellard
{
685
    unsigned char buf1[4];
686 576ae256 Michael Niedermayer
    int ret;
687 abba3dd1 Fabrice Bellard
688
    /* packetized write: output the header */
689
    buf1[0] = (buf_size >> 24);
690
    buf1[1] = (buf_size >> 16);
691
    buf1[2] = (buf_size >> 8);
692
    buf1[3] = (buf_size);
693 576ae256 Michael Niedermayer
    ret= dyn_buf_write(opaque, buf1, 4);
694
    if(ret < 0)
695
        return ret;
696 abba3dd1 Fabrice Bellard
697
    /* then the data */
698 576ae256 Michael Niedermayer
    return dyn_buf_write(opaque, buf, buf_size);
699 abba3dd1 Fabrice Bellard
}
700
701 536ffa59 Wolfram Gloger
static offset_t dyn_buf_seek(void *opaque, offset_t offset, int whence)
702 abba3dd1 Fabrice Bellard
{
703
    DynBuffer *d = opaque;
704
705
    if (whence == SEEK_CUR)
706
        offset += d->pos;
707
    else if (whence == SEEK_END)
708
        offset += d->size;
709
    if (offset < 0 || offset > 0x7fffffffLL)
710
        return -1;
711
    d->pos = offset;
712
    return 0;
713
}
714
715
static int url_open_dyn_buf_internal(ByteIOContext *s, int max_packet_size)
716
{
717
    DynBuffer *d;
718
    int io_buffer_size, ret;
719 115329f1 Diego Biurrun
720
    if (max_packet_size)
721 abba3dd1 Fabrice Bellard
        io_buffer_size = max_packet_size;
722
    else
723
        io_buffer_size = 1024;
724 115329f1 Diego Biurrun
725 568e18b1 Michael Niedermayer
    if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
726
        return -1;
727 abba3dd1 Fabrice Bellard
    d = av_malloc(sizeof(DynBuffer) + io_buffer_size);
728
    if (!d)
729
        return -1;
730
    d->io_buffer_size = io_buffer_size;
731
    d->buffer = NULL;
732
    d->pos = 0;
733
    d->size = 0;
734
    d->allocated_size = 0;
735 115329f1 Diego Biurrun
    ret = init_put_byte(s, d->io_buffer, io_buffer_size,
736
                        1, d, NULL,
737
                        max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
738 abba3dd1 Fabrice Bellard
                        max_packet_size ? NULL : dyn_buf_seek);
739
    if (ret == 0) {
740
        s->max_packet_size = max_packet_size;
741
    }
742
    return ret;
743
}
744
745
/*
746
 * Open a write only memory stream.
747 115329f1 Diego Biurrun
 *
748 abba3dd1 Fabrice Bellard
 * @param s new IO context
749
 * @return zero if no error.
750
 */
751
int url_open_dyn_buf(ByteIOContext *s)
752
{
753
    return url_open_dyn_buf_internal(s, 0);
754
}
755
756
/*
757
 * Open a write only packetized memory stream with a maximum packet
758
 * size of 'max_packet_size'.  The stream is stored in a memory buffer
759
 * with a big endian 4 byte header giving the packet size in bytes.
760 115329f1 Diego Biurrun
 *
761 abba3dd1 Fabrice Bellard
 * @param s new IO context
762 115329f1 Diego Biurrun
 * @param max_packet_size maximum packet size (must be > 0)
763 abba3dd1 Fabrice Bellard
 * @return zero if no error.
764
 */
765
int url_open_dyn_packet_buf(ByteIOContext *s, int max_packet_size)
766
{
767
    if (max_packet_size <= 0)
768
        return -1;
769
    return url_open_dyn_buf_internal(s, max_packet_size);
770
}
771
772 115329f1 Diego Biurrun
/*
773 abba3dd1 Fabrice Bellard
 * Return the written size and a pointer to the buffer. The buffer
774 115329f1 Diego Biurrun
 *  must be freed with av_free().
775 abba3dd1 Fabrice Bellard
 * @param s IO context
776
 * @param pointer to a byte buffer
777
 * @return the length of the byte buffer
778
 */
779 0c1a9eda Zdenek Kabelac
int url_close_dyn_buf(ByteIOContext *s, uint8_t **pbuffer)
780 abba3dd1 Fabrice Bellard
{
781
    DynBuffer *d = s->opaque;
782
    int size;
783
784
    put_flush_packet(s);
785
786
    *pbuffer = d->buffer;
787
    size = d->size;
788
    av_free(d);
789
    return size;
790
}
791 8fa641f8 Loïc Le Loarer
#endif /* CONFIG_MUXERS || CONFIG_NETWORK */