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1/*
2 * buffered I/O
3 * Copyright (c) 2000,2001 Fabrice Bellard
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#include "libavutil/bprint.h"
23#include "libavutil/crc.h"
24#include "libavutil/dict.h"
25#include "libavutil/intreadwrite.h"
26#include "libavutil/log.h"
27#include "libavutil/opt.h"
28#include "libavutil/avassert.h"
29#include "avformat.h"
30#include "avio.h"
31#include "avio_internal.h"
32#include "internal.h"
33#include "url.h"
34#include <stdarg.h>
35
36#define IO_BUFFER_SIZE 32768
37
38/**
39 * Do seeks within this distance ahead of the current buffer by skipping
40 * data instead of calling the protocol seek function, for seekable
41 * protocols.
42 */
43#define SHORT_SEEK_THRESHOLD 4096
44
45typedef struct AVIOInternal {
46 URLContext *h;
47} AVIOInternal;
48
49static void *ff_avio_child_next(void *obj, void *prev)
50{
51 AVIOContext *s = obj;
52 AVIOInternal *internal = s->opaque;
53 return prev ? NULL : internal->h;
54}
55
56static const AVClass *ff_avio_child_class_next(const AVClass *prev)
57{
58 return prev ? NULL : &ffurl_context_class;
59}
60
61#define OFFSET(x) offsetof(AVIOContext,x)
62#define E AV_OPT_FLAG_ENCODING_PARAM
63#define D AV_OPT_FLAG_DECODING_PARAM
64static const AVOption ff_avio_options[] = {
65 {"protocol_whitelist", "List of protocols that are allowed to be used", OFFSET(protocol_whitelist), AV_OPT_TYPE_STRING, { .str = NULL }, CHAR_MIN, CHAR_MAX, D },
66 { NULL },
67};
68
69const AVClass ff_avio_class = {
70 .class_name = "AVIOContext",
71 .item_name = av_default_item_name,
72 .version = LIBAVUTIL_VERSION_INT,
73 .option = ff_avio_options,
74 .child_next = ff_avio_child_next,
75 .child_class_next = ff_avio_child_class_next,
76};
77
78static void fill_buffer(AVIOContext *s);
79static int url_resetbuf(AVIOContext *s, int flags);
80
81int ffio_init_context(AVIOContext *s,
82 unsigned char *buffer,
83 int buffer_size,
84 int write_flag,
85 void *opaque,
86 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
87 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
88 int64_t (*seek)(void *opaque, int64_t offset, int whence))
89{
90 s->buffer = buffer;
91 s->orig_buffer_size =
92 s->buffer_size = buffer_size;
93 s->buf_ptr = buffer;
94 s->opaque = opaque;
95 s->direct = 0;
96
97 url_resetbuf(s, write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ);
98
99 s->write_packet = write_packet;
100 s->read_packet = read_packet;
101 s->seek = seek;
102 s->pos = 0;
103 s->must_flush = 0;
104 s->eof_reached = 0;
105 s->error = 0;
106 s->seekable = seek ? AVIO_SEEKABLE_NORMAL : 0;
107 s->max_packet_size = 0;
108 s->update_checksum = NULL;
109 s->short_seek_threshold = SHORT_SEEK_THRESHOLD;
110
111 if (!read_packet && !write_flag) {
112 s->pos = buffer_size;
113 s->buf_end = s->buffer + buffer_size;
114 }
115 s->read_pause = NULL;
116 s->read_seek = NULL;
117
118 s->write_data_type = NULL;
119 s->ignore_boundary_point = 0;
120 s->current_type = AVIO_DATA_MARKER_UNKNOWN;
121 s->last_time = AV_NOPTS_VALUE;
122 s->short_seek_get = NULL;
123
124 return 0;
125}
126
127AVIOContext *avio_alloc_context(
128 unsigned char *buffer,
129 int buffer_size,
130 int write_flag,
131 void *opaque,
132 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
133 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
134 int64_t (*seek)(void *opaque, int64_t offset, int whence))
135{
136 AVIOContext *s = av_mallocz(sizeof(AVIOContext));
137 if (!s)
138 return NULL;
139 ffio_init_context(s, buffer, buffer_size, write_flag, opaque,
140 read_packet, write_packet, seek);
141 return s;
142}
143
144static void writeout(AVIOContext *s, const uint8_t *data, int len)
145{
146 if (!s->error) {
147 int ret = 0;
148 if (s->write_data_type)
149 ret = s->write_data_type(s->opaque, (uint8_t *)data,
150 len,
151 s->current_type,
152 s->last_time);
153 else if (s->write_packet)
154 ret = s->write_packet(s->opaque, (uint8_t *)data, len);
155 if (ret < 0) {
156 s->error = ret;
157 }
158 }
159 if (s->current_type == AVIO_DATA_MARKER_SYNC_POINT ||
160 s->current_type == AVIO_DATA_MARKER_BOUNDARY_POINT) {
161 s->current_type = AVIO_DATA_MARKER_UNKNOWN;
162 }
163 s->last_time = AV_NOPTS_VALUE;
164 s->writeout_count ++;
165 s->pos += len;
166}
167
168static void flush_buffer(AVIOContext *s)
169{
170 if (s->write_flag && s->buf_ptr > s->buffer) {
171 writeout(s, s->buffer, s->buf_ptr - s->buffer);
172 if (s->update_checksum) {
173 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
174 s->buf_ptr - s->checksum_ptr);
175 s->checksum_ptr = s->buffer;
176 }
177 }
178 s->buf_ptr = s->buffer;
179 if (!s->write_flag)
180 s->buf_end = s->buffer;
181}
182
183void avio_w8(AVIOContext *s, int b)
184{
185 av_assert2(b>=-128 && b<=255);
186 *s->buf_ptr++ = b;
187 if (s->buf_ptr >= s->buf_end)
188 flush_buffer(s);
189}
190
191void ffio_fill(AVIOContext *s, int b, int count)
192{
193 while (count > 0) {
194 int len = FFMIN(s->buf_end - s->buf_ptr, count);
195 memset(s->buf_ptr, b, len);
196 s->buf_ptr += len;
197
198 if (s->buf_ptr >= s->buf_end)
199 flush_buffer(s);
200
201 count -= len;
202 }
203}
204
205void avio_write(AVIOContext *s, const unsigned char *buf, int size)
206{
207 if (s->direct && !s->update_checksum) {
208 avio_flush(s);
209 writeout(s, buf, size);
210 return;
211 }
212 while (size > 0) {
213 int len = FFMIN(s->buf_end - s->buf_ptr, size);
214 memcpy(s->buf_ptr, buf, len);
215 s->buf_ptr += len;
216
217 if (s->buf_ptr >= s->buf_end)
218 flush_buffer(s);
219
220 buf += len;
221 size -= len;
222 }
223}
224
225void avio_flush(AVIOContext *s)
226{
227 flush_buffer(s);
228 s->must_flush = 0;
229}
230
231int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
232{
233 int64_t offset1;
234 int64_t pos;
235 int force = whence & AVSEEK_FORCE;
236 int buffer_size;
237 int short_seek;
238 whence &= ~AVSEEK_FORCE;
239
240 if(!s)
241 return AVERROR(EINVAL);
242
243 buffer_size = s->buf_end - s->buffer;
244 // pos is the absolute position that the beginning of s->buffer corresponds to in the file
245 pos = s->pos - (s->write_flag ? 0 : buffer_size);
246
247 if (whence != SEEK_CUR && whence != SEEK_SET)
248 return AVERROR(EINVAL);
249
250 if (whence == SEEK_CUR) {
251 offset1 = pos + (s->buf_ptr - s->buffer);
252 if (offset == 0)
253 return offset1;
254 offset += offset1;
255 }
256 if (offset < 0)
257 return AVERROR(EINVAL);
258
259 if (s->short_seek_get) {
260 short_seek = s->short_seek_get(s->opaque);
261 /* fallback to default short seek */
262 if (short_seek <= 0)
263 short_seek = s->short_seek_threshold;
264 } else
265 short_seek = s->short_seek_threshold;
266
267 offset1 = offset - pos; // "offset1" is the relative offset from the beginning of s->buffer
268 if (!s->must_flush && (!s->direct || !s->seek) &&
269 offset1 >= 0 && offset1 <= buffer_size - s->write_flag) {
270 /* can do the seek inside the buffer */
271 s->buf_ptr = s->buffer + offset1;
272 } else if ((!(s->seekable & AVIO_SEEKABLE_NORMAL) ||
273 offset1 <= buffer_size + short_seek) &&
274 !s->write_flag && offset1 >= 0 &&
275 (!s->direct || !s->seek) &&
276 (whence != SEEK_END || force)) {
277 while(s->pos < offset && !s->eof_reached)
278 fill_buffer(s);
279 if (s->eof_reached)
280 return AVERROR_EOF;
281 s->buf_ptr = s->buf_end - (s->pos - offset);
282 } else if(!s->write_flag && offset1 < 0 && -offset1 < buffer_size>>1 && s->seek && offset > 0) {
283 int64_t res;
284
285 pos -= FFMIN(buffer_size>>1, pos);
286 if ((res = s->seek(s->opaque, pos, SEEK_SET)) < 0)
287 return res;
288 s->buf_end =
289 s->buf_ptr = s->buffer;
290 s->pos = pos;
291 s->eof_reached = 0;
292 fill_buffer(s);
293 return avio_seek(s, offset, SEEK_SET | force);
294 } else {
295 int64_t res;
296 if (s->write_flag) {
297 flush_buffer(s);
298 s->must_flush = 1;
299 }
300 if (!s->seek)
301 return AVERROR(EPIPE);
302 if ((res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
303 return res;
304 s->seek_count ++;
305 if (!s->write_flag)
306 s->buf_end = s->buffer;
307 s->buf_ptr = s->buffer;
308 s->pos = offset;
309 }
310 s->eof_reached = 0;
311 return offset;
312}
313
314int64_t avio_skip(AVIOContext *s, int64_t offset)
315{
316 return avio_seek(s, offset, SEEK_CUR);
317}
318
319int64_t avio_size(AVIOContext *s)
320{
321 int64_t size;
322
323 if (!s)
324 return AVERROR(EINVAL);
325
326 if (!s->seek)
327 return AVERROR(ENOSYS);
328 size = s->seek(s->opaque, 0, AVSEEK_SIZE);
329 if (size < 0) {
330 if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
331 return size;
332 size++;
333 s->seek(s->opaque, s->pos, SEEK_SET);
334 }
335 return size;
336}
337
338int avio_feof(AVIOContext *s)
339{
340 if(!s)
341 return 0;
342 if(s->eof_reached){
343 s->eof_reached=0;
344 fill_buffer(s);
345 }
346 return s->eof_reached;
347}
348
349#if FF_API_URL_FEOF
350int url_feof(AVIOContext *s)
351{
352 return avio_feof(s);
353}
354#endif
355
356void avio_wl32(AVIOContext *s, unsigned int val)
357{
358 avio_w8(s, (uint8_t) val );
359 avio_w8(s, (uint8_t)(val >> 8 ));
360 avio_w8(s, (uint8_t)(val >> 16));
361 avio_w8(s, val >> 24 );
362}
363
364void avio_wb32(AVIOContext *s, unsigned int val)
365{
366 avio_w8(s, val >> 24 );
367 avio_w8(s, (uint8_t)(val >> 16));
368 avio_w8(s, (uint8_t)(val >> 8 ));
369 avio_w8(s, (uint8_t) val );
370}
371
372int avio_put_str(AVIOContext *s, const char *str)
373{
374 int len = 1;
375 if (str) {
376 len += strlen(str);
377 avio_write(s, (const unsigned char *) str, len);
378 } else
379 avio_w8(s, 0);
380 return len;
381}
382
383static inline int put_str16(AVIOContext *s, const char *str, const int be)
384{
385 const uint8_t *q = str;
386 int ret = 0;
387 int err = 0;
388
389 while (*q) {
390 uint32_t ch;
391 uint16_t tmp;
392
393 GET_UTF8(ch, *q++, goto invalid;)
394 PUT_UTF16(ch, tmp, be ? avio_wb16(s, tmp) : avio_wl16(s, tmp);
395 ret += 2;)
396 continue;
397invalid:
398 av_log(s, AV_LOG_ERROR, "Invalid UTF8 sequence in avio_put_str16%s\n", be ? "be" : "le");
399 err = AVERROR(EINVAL);
400 if (!*(q-1))
401 break;
402 }
403 if (be)
404 avio_wb16(s, 0);
405 else
406 avio_wl16(s, 0);
407 if (err)
408 return err;
409 ret += 2;
410 return ret;
411}
412
413#define PUT_STR16(type, big_endian) \
414int avio_put_str16 ## type(AVIOContext *s, const char *str) \
415{ \
416return put_str16(s, str, big_endian); \
417}
418
419PUT_STR16(le, 0)
420PUT_STR16(be, 1)
421
422#undef PUT_STR16
423
424int ff_get_v_length(uint64_t val)
425{
426 int i = 1;
427
428 while (val >>= 7)
429 i++;
430
431 return i;
432}
433
434void ff_put_v(AVIOContext *bc, uint64_t val)
435{
436 int i = ff_get_v_length(val);
437
438 while (--i > 0)
439 avio_w8(bc, 128 | (uint8_t)(val >> (7*i)));
440
441 avio_w8(bc, val & 127);
442}
443
444void avio_wl64(AVIOContext *s, uint64_t val)
445{
446 avio_wl32(s, (uint32_t)(val & 0xffffffff));
447 avio_wl32(s, (uint32_t)(val >> 32));
448}
449
450void avio_wb64(AVIOContext *s, uint64_t val)
451{
452 avio_wb32(s, (uint32_t)(val >> 32));
453 avio_wb32(s, (uint32_t)(val & 0xffffffff));
454}
455
456void avio_wl16(AVIOContext *s, unsigned int val)
457{
458 avio_w8(s, (uint8_t)val);
459 avio_w8(s, (int)val >> 8);
460}
461
462void avio_wb16(AVIOContext *s, unsigned int val)
463{
464 avio_w8(s, (int)val >> 8);
465 avio_w8(s, (uint8_t)val);
466}
467
468void avio_wl24(AVIOContext *s, unsigned int val)
469{
470 avio_wl16(s, val & 0xffff);
471 avio_w8(s, (int)val >> 16);
472}
473
474void avio_wb24(AVIOContext *s, unsigned int val)
475{
476 avio_wb16(s, (int)val >> 8);
477 avio_w8(s, (uint8_t)val);
478}
479
480void avio_write_marker(AVIOContext *s, int64_t time, enum AVIODataMarkerType type)
481{
482 if (!s->write_data_type)
483 return;
484 // If ignoring boundary points, just treat it as unknown
485 if (type == AVIO_DATA_MARKER_BOUNDARY_POINT && s->ignore_boundary_point)
486 type = AVIO_DATA_MARKER_UNKNOWN;
487 // Avoid unnecessary flushes if we are already in non-header/trailer
488 // data and setting the type to unknown
489 if (type == AVIO_DATA_MARKER_UNKNOWN &&
490 (s->current_type != AVIO_DATA_MARKER_HEADER &&
491 s->current_type != AVIO_DATA_MARKER_TRAILER))
492 return;
493
494 switch (type) {
495 case AVIO_DATA_MARKER_HEADER:
496 case AVIO_DATA_MARKER_TRAILER:
497 // For header/trailer, ignore a new marker of the same type;
498 // consecutive header/trailer markers can be merged.
499 if (type == s->current_type)
500 return;
501 break;
502 }
503
504 // If we've reached here, we have a new, noteworthy marker.
505 // Flush the previous data and mark the start of the new data.
506 avio_flush(s);
507 s->current_type = type;
508 s->last_time = time;
509}
510
511/* Input stream */
512
513static void fill_buffer(AVIOContext *s)
514{
515 int max_buffer_size = s->max_packet_size ?
516 s->max_packet_size : IO_BUFFER_SIZE;
517 uint8_t *dst = s->buf_end - s->buffer + max_buffer_size < s->buffer_size ?
518 s->buf_end : s->buffer;
519 int len = s->buffer_size - (dst - s->buffer);
520
521 /* can't fill the buffer without read_packet, just set EOF if appropriate */
522 if (!s->read_packet && s->buf_ptr >= s->buf_end)
523 s->eof_reached = 1;
524
525 /* no need to do anything if EOF already reached */
526 if (s->eof_reached)
527 return;
528
529 if (s->update_checksum && dst == s->buffer) {
530 if (s->buf_end > s->checksum_ptr)
531 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
532 s->buf_end - s->checksum_ptr);
533 s->checksum_ptr = s->buffer;
534 }
535
536 /* make buffer smaller in case it ended up large after probing */
537 if (s->read_packet && s->orig_buffer_size && s->buffer_size > s->orig_buffer_size) {
538 if (dst == s->buffer) {
539 int ret = ffio_set_buf_size(s, s->orig_buffer_size);
540 if (ret < 0)
541 av_log(s, AV_LOG_WARNING, "Failed to decrease buffer size\n");
542
543 s->checksum_ptr = dst = s->buffer;
544 }
545 av_assert0(len >= s->orig_buffer_size);
546 len = s->orig_buffer_size;
547 }
548
549 if (s->read_packet)
550 len = s->read_packet(s->opaque, dst, len);
551 else
552 len = 0;
553 if (len <= 0) {
554 /* do not modify buffer if EOF reached so that a seek back can
555 be done without rereading data */
556 s->eof_reached = 1;
557 if (len < 0)
558 s->error = len;
559 } else {
560 s->pos += len;
561 s->buf_ptr = dst;
562 s->buf_end = dst + len;
563 s->bytes_read += len;
564 }
565}
566
567unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
568 unsigned int len)
569{
570 return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
571}
572
573unsigned long ff_crcEDB88320_update(unsigned long checksum, const uint8_t *buf,
574 unsigned int len)
575{
576 return av_crc(av_crc_get_table(AV_CRC_32_IEEE_LE), checksum, buf, len);
577}
578
579unsigned long ff_crcA001_update(unsigned long checksum, const uint8_t *buf,
580 unsigned int len)
581{
582 return av_crc(av_crc_get_table(AV_CRC_16_ANSI_LE), checksum, buf, len);
583}
584
585unsigned long ffio_get_checksum(AVIOContext *s)
586{
587 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
588 s->buf_ptr - s->checksum_ptr);
589 s->update_checksum = NULL;
590 return s->checksum;
591}
592
593void ffio_init_checksum(AVIOContext *s,
594 unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
595 unsigned long checksum)
596{
597 s->update_checksum = update_checksum;
598 if (s->update_checksum) {
599 s->checksum = checksum;
600 s->checksum_ptr = s->buf_ptr;
601 }
602}
603
604/* XXX: put an inline version */
605int avio_r8(AVIOContext *s)
606{
607 if (s->buf_ptr >= s->buf_end)
608 fill_buffer(s);
609 if (s->buf_ptr < s->buf_end)
610 return *s->buf_ptr++;
611 return 0;
612}
613
614int avio_read(AVIOContext *s, unsigned char *buf, int size)
615{
616 int len, size1;
617
618 size1 = size;
619 while (size > 0) {
620 len = FFMIN(s->buf_end - s->buf_ptr, size);
621 if (len == 0 || s->write_flag) {
622 if((s->direct || size > s->buffer_size) && !s->update_checksum) {
623 // bypass the buffer and read data directly into buf
624 if(s->read_packet)
625 len = s->read_packet(s->opaque, buf, size);
626
627 if (len <= 0) {
628 /* do not modify buffer if EOF reached so that a seek back can
629 be done without rereading data */
630 s->eof_reached = 1;
631 if(len<0)
632 s->error= len;
633 break;
634 } else {
635 s->pos += len;
636 s->bytes_read += len;
637 size -= len;
638 buf += len;
639 // reset the buffer
640 s->buf_ptr = s->buffer;
641 s->buf_end = s->buffer/* + len*/;
642 }
643 } else {
644 fill_buffer(s);
645 len = s->buf_end - s->buf_ptr;
646 if (len == 0)
647 break;
648 }
649 } else {
650 memcpy(buf, s->buf_ptr, len);
651 buf += len;
652 s->buf_ptr += len;
653 size -= len;
654 }
655 }
656 if (size1 == size) {
657 if (s->error) return s->error;
658 if (avio_feof(s)) return AVERROR_EOF;
659 }
660 return size1 - size;
661}
662
663int ffio_read_size(AVIOContext *s, unsigned char *buf, int size)
664{
665 int ret = avio_read(s, buf, size);
666 if (ret != size)
667 return AVERROR_INVALIDDATA;
668 return ret;
669}
670
671int ffio_read_indirect(AVIOContext *s, unsigned char *buf, int size, const unsigned char **data)
672{
673 if (s->buf_end - s->buf_ptr >= size && !s->write_flag) {
674 *data = s->buf_ptr;
675 s->buf_ptr += size;
676 return size;
677 } else {
678 *data = buf;
679 return avio_read(s, buf, size);
680 }
681}
682
683int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size)
684{
685 int len;
686
687 if (size < 0)
688 return -1;
689
690 if (s->read_packet && s->write_flag) {
691 len = s->read_packet(s->opaque, buf, size);
692 if (len > 0)
693 s->pos += len;
694 return len;
695 }
696
697 len = s->buf_end - s->buf_ptr;
698 if (len == 0) {
699 /* Reset the buf_end pointer to the start of the buffer, to make sure
700 * the fill_buffer call tries to read as much data as fits into the
701 * full buffer, instead of just what space is left after buf_end.
702 * This avoids returning partial packets at the end of the buffer,
703 * for packet based inputs.
704 */
705 s->buf_end = s->buf_ptr = s->buffer;
706 fill_buffer(s);
707 len = s->buf_end - s->buf_ptr;
708 }
709 if (len > size)
710 len = size;
711 memcpy(buf, s->buf_ptr, len);
712 s->buf_ptr += len;
713 if (!len) {
714 if (s->error) return s->error;
715 if (avio_feof(s)) return AVERROR_EOF;
716 }
717 return len;
718}
719
720unsigned int avio_rl16(AVIOContext *s)
721{
722 unsigned int val;
723 val = avio_r8(s);
724 val |= avio_r8(s) << 8;
725 return val;
726}
727
728unsigned int avio_rl24(AVIOContext *s)
729{
730 unsigned int val;
731 val = avio_rl16(s);
732 val |= avio_r8(s) << 16;
733 return val;
734}
735
736unsigned int avio_rl32(AVIOContext *s)
737{
738 unsigned int val;
739 val = avio_rl16(s);
740 val |= avio_rl16(s) << 16;
741 return val;
742}
743
744uint64_t avio_rl64(AVIOContext *s)
745{
746 uint64_t val;
747 val = (uint64_t)avio_rl32(s);
748 val |= (uint64_t)avio_rl32(s) << 32;
749 return val;
750}
751
752unsigned int avio_rb16(AVIOContext *s)
753{
754 unsigned int val;
755 val = avio_r8(s) << 8;
756 val |= avio_r8(s);
757 return val;
758}
759
760unsigned int avio_rb24(AVIOContext *s)
761{
762 unsigned int val;
763 val = avio_rb16(s) << 8;
764 val |= avio_r8(s);
765 return val;
766}
767unsigned int avio_rb32(AVIOContext *s)
768{
769 unsigned int val;
770 val = avio_rb16(s) << 16;
771 val |= avio_rb16(s);
772 return val;
773}
774
775int ff_get_line(AVIOContext *s, char *buf, int maxlen)
776{
777 int i = 0;
778 char c;
779
780 do {
781 c = avio_r8(s);
782 if (c && i < maxlen-1)
783 buf[i++] = c;
784 } while (c != '\n' && c != '\r' && c);
785 if (c == '\r' && avio_r8(s) != '\n' && !avio_feof(s))
786 avio_skip(s, -1);
787
788 buf[i] = 0;
789 return i;
790}
791
792int avio_get_str(AVIOContext *s, int maxlen, char *buf, int buflen)
793{
794 int i;
795
796 if (buflen <= 0)
797 return AVERROR(EINVAL);
798 // reserve 1 byte for terminating 0
799 buflen = FFMIN(buflen - 1, maxlen);
800 for (i = 0; i < buflen; i++)
801 if (!(buf[i] = avio_r8(s)))
802 return i + 1;
803 buf[i] = 0;
804 for (; i < maxlen; i++)
805 if (!avio_r8(s))
806 return i + 1;
807 return maxlen;
808}
809
810#define GET_STR16(type, read) \
811 int avio_get_str16 ##type(AVIOContext *pb, int maxlen, char *buf, int buflen)\
812{\
813 char* q = buf;\
814 int ret = 0;\
815 if (buflen <= 0) \
816 return AVERROR(EINVAL); \
817 while (ret + 1 < maxlen) {\
818 uint8_t tmp;\
819 uint32_t ch;\
820 GET_UTF16(ch, (ret += 2) <= maxlen ? read(pb) : 0, break;)\
821 if (!ch)\
822 break;\
823 PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)\
824 }\
825 *q = 0;\
826 return ret;\
827}\
828
829GET_STR16(le, avio_rl16)
830GET_STR16(be, avio_rb16)
831
832#undef GET_STR16
833
834uint64_t avio_rb64(AVIOContext *s)
835{
836 uint64_t val;
837 val = (uint64_t)avio_rb32(s) << 32;
838 val |= (uint64_t)avio_rb32(s);
839 return val;
840}
841
842uint64_t ffio_read_varlen(AVIOContext *bc){
843 uint64_t val = 0;
844 int tmp;
845
846 do{
847 tmp = avio_r8(bc);
848 val= (val<<7) + (tmp&127);
849 }while(tmp&128);
850 return val;
851}
852
853static int io_read_packet(void *opaque, uint8_t *buf, int buf_size)
854{
855 AVIOInternal *internal = opaque;
856 return ffurl_read(internal->h, buf, buf_size);
857}
858
859static int io_write_packet(void *opaque, uint8_t *buf, int buf_size)
860{
861 AVIOInternal *internal = opaque;
862 return ffurl_write(internal->h, buf, buf_size);
863}
864
865static int64_t io_seek(void *opaque, int64_t offset, int whence)
866{
867 AVIOInternal *internal = opaque;
868 return ffurl_seek(internal->h, offset, whence);
869}
870
871static int io_short_seek(void *opaque)
872{
873 AVIOInternal *internal = opaque;
874 return ffurl_get_short_seek(internal->h);
875}
876
877static int io_read_pause(void *opaque, int pause)
878{
879 AVIOInternal *internal = opaque;
880 if (!internal->h->prot->url_read_pause)
881 return AVERROR(ENOSYS);
882 return internal->h->prot->url_read_pause(internal->h, pause);
883}
884
885static int64_t io_read_seek(void *opaque, int stream_index, int64_t timestamp, int flags)
886{
887 AVIOInternal *internal = opaque;
888 if (!internal->h->prot->url_read_seek)
889 return AVERROR(ENOSYS);
890 return internal->h->prot->url_read_seek(internal->h, stream_index, timestamp, flags);
891}
892
893int ffio_fdopen(AVIOContext **s, URLContext *h)
894{
895 AVIOInternal *internal = NULL;
896 uint8_t *buffer = NULL;
897 int buffer_size, max_packet_size;
898
899 max_packet_size = h->max_packet_size;
900 if (max_packet_size) {
901 buffer_size = max_packet_size; /* no need to bufferize more than one packet */
902 } else {
903 buffer_size = IO_BUFFER_SIZE;
904 }
905 buffer = av_malloc(buffer_size);
906 if (!buffer)
907 return AVERROR(ENOMEM);
908
909 internal = av_mallocz(sizeof(*internal));
910 if (!internal)
911 goto fail;
912
913 internal->h = h;
914
915 *s = avio_alloc_context(buffer, buffer_size, h->flags & AVIO_FLAG_WRITE,
916 internal, io_read_packet, io_write_packet, io_seek);
917 if (!*s)
918 goto fail;
919
920 (*s)->protocol_whitelist = av_strdup(h->protocol_whitelist);
921 if (!(*s)->protocol_whitelist && h->protocol_whitelist) {
922 avio_closep(s);
923 goto fail;
924 }
925 (*s)->protocol_blacklist = av_strdup(h->protocol_blacklist);
926 if (!(*s)->protocol_blacklist && h->protocol_blacklist) {
927 avio_closep(s);
928 goto fail;
929 }
930 (*s)->direct = h->flags & AVIO_FLAG_DIRECT;
931
932 (*s)->seekable = h->is_streamed ? 0 : AVIO_SEEKABLE_NORMAL;
933 (*s)->max_packet_size = max_packet_size;
934 if(h->prot) {
935 (*s)->read_pause = io_read_pause;
936 (*s)->read_seek = io_read_seek;
937
938 if (h->prot->url_read_seek)
939 (*s)->seekable |= AVIO_SEEKABLE_TIME;
940 }
941 (*s)->short_seek_get = io_short_seek;
942 (*s)->av_class = &ff_avio_class;
943 return 0;
944fail:
945 av_freep(&internal);
946 av_freep(&buffer);
947 return AVERROR(ENOMEM);
948}
949
950int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size)
951{
952 uint8_t *buffer;
953 int max_buffer_size = s->max_packet_size ?
954 s->max_packet_size : IO_BUFFER_SIZE;
955 int filled = s->buf_end - s->buffer;
956 ptrdiff_t checksum_ptr_offset = s->checksum_ptr ? s->checksum_ptr - s->buffer : -1;
957
958 buf_size += s->buf_ptr - s->buffer + max_buffer_size;
959
960 if (buf_size < filled || s->seekable || !s->read_packet)
961 return 0;
962 av_assert0(!s->write_flag);
963
964 buffer = av_malloc(buf_size);
965 if (!buffer)
966 return AVERROR(ENOMEM);
967
968 memcpy(buffer, s->buffer, filled);
969 av_free(s->buffer);
970 s->buf_ptr = buffer + (s->buf_ptr - s->buffer);
971 s->buf_end = buffer + (s->buf_end - s->buffer);
972 s->buffer = buffer;
973 s->buffer_size = buf_size;
974 if (checksum_ptr_offset >= 0)
975 s->checksum_ptr = s->buffer + checksum_ptr_offset;
976 return 0;
977}
978
979int ffio_set_buf_size(AVIOContext *s, int buf_size)
980{
981 uint8_t *buffer;
982 buffer = av_malloc(buf_size);
983 if (!buffer)
984 return AVERROR(ENOMEM);
985
986 av_free(s->buffer);
987 s->buffer = buffer;
988 s->orig_buffer_size =
989 s->buffer_size = buf_size;
990 s->buf_ptr = buffer;
991 url_resetbuf(s, s->write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ);
992 return 0;
993}
994
995static int url_resetbuf(AVIOContext *s, int flags)
996{
997 av_assert1(flags == AVIO_FLAG_WRITE || flags == AVIO_FLAG_READ);
998
999 if (flags & AVIO_FLAG_WRITE) {
1000 s->buf_end = s->buffer + s->buffer_size;
1001 s->write_flag = 1;
1002 } else {
1003 s->buf_end = s->buffer;
1004 s->write_flag = 0;
1005 }
1006 return 0;
1007}
1008
1009int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char **bufp, int buf_size)
1010{
1011 int64_t buffer_start;
1012 int buffer_size;
1013 int overlap, new_size, alloc_size;
1014 uint8_t *buf = *bufp;
1015
1016 if (s->write_flag) {
1017 av_freep(bufp);
1018 return AVERROR(EINVAL);
1019 }
1020
1021 buffer_size = s->buf_end - s->buffer;
1022
1023 /* the buffers must touch or overlap */
1024 if ((buffer_start = s->pos - buffer_size) > buf_size) {
1025 av_freep(bufp);
1026 return AVERROR(EINVAL);
1027 }
1028
1029 overlap = buf_size - buffer_start;
1030 new_size = buf_size + buffer_size - overlap;
1031
1032 alloc_size = FFMAX(s->buffer_size, new_size);
1033 if (alloc_size > buf_size)
1034 if (!(buf = (*bufp) = av_realloc_f(buf, 1, alloc_size)))
1035 return AVERROR(ENOMEM);
1036
1037 if (new_size > buf_size) {
1038 memcpy(buf + buf_size, s->buffer + overlap, buffer_size - overlap);
1039 buf_size = new_size;
1040 }
1041
1042 av_free(s->buffer);
1043 s->buf_ptr = s->buffer = buf;
1044 s->buffer_size = alloc_size;
1045 s->pos = buf_size;
1046 s->buf_end = s->buf_ptr + buf_size;
1047 s->eof_reached = 0;
1048 s->must_flush = 0;
1049
1050 return 0;
1051}
1052
1053int avio_open(AVIOContext **s, const char *filename, int flags)
1054{
1055 return avio_open2(s, filename, flags, NULL, NULL);
1056}
1057
1058int ffio_open_whitelist(AVIOContext **s, const char *filename, int flags,
1059 const AVIOInterruptCB *int_cb, AVDictionary **options,
1060 const char *whitelist, const char *blacklist
1061 )
1062{
1063 URLContext *h;
1064 int err;
1065
1066 err = ffurl_open_whitelist(&h, filename, flags, int_cb, options, whitelist, blacklist, NULL);
1067 if (err < 0)
1068 return err;
1069 err = ffio_fdopen(s, h);
1070 if (err < 0) {
1071 ffurl_close(h);
1072 return err;
1073 }
1074 return 0;
1075}
1076
1077int avio_open2(AVIOContext **s, const char *filename, int flags,
1078 const AVIOInterruptCB *int_cb, AVDictionary **options)
1079{
1080 return ffio_open_whitelist(s, filename, flags, int_cb, options, NULL, NULL);
1081}
1082
1083int ffio_open2_wrapper(struct AVFormatContext *s, AVIOContext **pb, const char *url, int flags,
1084 const AVIOInterruptCB *int_cb, AVDictionary **options)
1085{
1086 return ffio_open_whitelist(pb, url, flags, int_cb, options, s->protocol_whitelist, s->protocol_blacklist);
1087}
1088
1089int avio_close(AVIOContext *s)
1090{
1091 AVIOInternal *internal;
1092 URLContext *h;
1093
1094 if (!s)
1095 return 0;
1096
1097 avio_flush(s);
1098 internal = s->opaque;
1099 h = internal->h;
1100
1101 av_freep(&s->opaque);
1102 av_freep(&s->buffer);
1103 if (s->write_flag)
1104 av_log(s, AV_LOG_DEBUG, "Statistics: %d seeks, %d writeouts\n", s->seek_count, s->writeout_count);
1105 else
1106 av_log(s, AV_LOG_DEBUG, "Statistics: %"PRId64" bytes read, %d seeks\n", s->bytes_read, s->seek_count);
1107 av_opt_free(s);
1108 av_free(s);
1109 return ffurl_close(h);
1110}
1111
1112int avio_closep(AVIOContext **s)
1113{
1114 int ret = avio_close(*s);
1115 *s = NULL;
1116 return ret;
1117}
1118
1119int avio_printf(AVIOContext *s, const char *fmt, ...)
1120{
1121 va_list ap;
1122 char buf[4096]; /* update doc entry in avio.h if changed */
1123 int ret;
1124
1125 va_start(ap, fmt);
1126 ret = vsnprintf(buf, sizeof(buf), fmt, ap);
1127 va_end(ap);
1128 avio_write(s, buf, strlen(buf));
1129 return ret;
1130}
1131
1132int avio_pause(AVIOContext *s, int pause)
1133{
1134 if (!s->read_pause)
1135 return AVERROR(ENOSYS);
1136 return s->read_pause(s->opaque, pause);
1137}
1138
1139int64_t avio_seek_time(AVIOContext *s, int stream_index,
1140 int64_t timestamp, int flags)
1141{
1142 int64_t ret;
1143 if (!s->read_seek)
1144 return AVERROR(ENOSYS);
1145 ret = s->read_seek(s->opaque, stream_index, timestamp, flags);
1146 if (ret >= 0) {
1147 int64_t pos;
1148 s->buf_ptr = s->buf_end; // Flush buffer
1149 pos = s->seek(s->opaque, 0, SEEK_CUR);
1150 if (pos >= 0)
1151 s->pos = pos;
1152 else if (pos != AVERROR(ENOSYS))
1153 ret = pos;
1154 }
1155 return ret;
1156}
1157
1158int avio_read_to_bprint(AVIOContext *h, AVBPrint *pb, size_t max_size)
1159{
1160 int ret;
1161 char buf[1024];
1162 while (max_size) {
1163 ret = avio_read(h, buf, FFMIN(max_size, sizeof(buf)));
1164 if (ret == AVERROR_EOF)
1165 return 0;
1166 if (ret <= 0)
1167 return ret;
1168 av_bprint_append_data(pb, buf, ret);
1169 if (!av_bprint_is_complete(pb))
1170 return AVERROR(ENOMEM);
1171 max_size -= ret;
1172 }
1173 return 0;
1174}
1175
1176int avio_accept(AVIOContext *s, AVIOContext **c)
1177{
1178 int ret;
1179 AVIOInternal *internal = s->opaque;
1180 URLContext *sc = internal->h;
1181 URLContext *cc = NULL;
1182 ret = ffurl_accept(sc, &cc);
1183 if (ret < 0)
1184 return ret;
1185 return ffio_fdopen(c, cc);
1186}
1187
1188int avio_handshake(AVIOContext *c)
1189{
1190 AVIOInternal *internal = c->opaque;
1191 URLContext *cc = internal->h;
1192 return ffurl_handshake(cc);
1193}
1194
1195/* output in a dynamic buffer */
1196
1197typedef struct DynBuffer {
1198 int pos, size, allocated_size;
1199 uint8_t *buffer;
1200 int io_buffer_size;
1201 uint8_t io_buffer[1];
1202} DynBuffer;
1203
1204static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
1205{
1206 DynBuffer *d = opaque;
1207 unsigned new_size, new_allocated_size;
1208
1209 /* reallocate buffer if needed */
1210 new_size = d->pos + buf_size;
1211 new_allocated_size = d->allocated_size;
1212 if (new_size < d->pos || new_size > INT_MAX/2)
1213 return -1;
1214 while (new_size > new_allocated_size) {
1215 if (!new_allocated_size)
1216 new_allocated_size = new_size;
1217 else
1218 new_allocated_size += new_allocated_size / 2 + 1;
1219 }
1220
1221 if (new_allocated_size > d->allocated_size) {
1222 int err;
1223 if ((err = av_reallocp(&d->buffer, new_allocated_size)) < 0) {
1224 d->allocated_size = 0;
1225 d->size = 0;
1226 return err;
1227 }
1228 d->allocated_size = new_allocated_size;
1229 }
1230 memcpy(d->buffer + d->pos, buf, buf_size);
1231 d->pos = new_size;
1232 if (d->pos > d->size)
1233 d->size = d->pos;
1234 return buf_size;
1235}
1236
1237static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
1238{
1239 unsigned char buf1[4];
1240 int ret;
1241
1242 /* packetized write: output the header */
1243 AV_WB32(buf1, buf_size);
1244 ret = dyn_buf_write(opaque, buf1, 4);
1245 if (ret < 0)
1246 return ret;
1247
1248 /* then the data */
1249 return dyn_buf_write(opaque, buf, buf_size);
1250}
1251
1252static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
1253{
1254 DynBuffer *d = opaque;
1255
1256 if (whence == SEEK_CUR)
1257 offset += d->pos;
1258 else if (whence == SEEK_END)
1259 offset += d->size;
1260 if (offset < 0 || offset > 0x7fffffffLL)
1261 return -1;
1262 d->pos = offset;
1263 return 0;
1264}
1265
1266static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size)
1267{
1268 DynBuffer *d;
1269 unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
1270
1271 if (sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
1272 return -1;
1273 d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
1274 if (!d)
1275 return AVERROR(ENOMEM);
1276 d->io_buffer_size = io_buffer_size;
1277 *s = avio_alloc_context(d->io_buffer, d->io_buffer_size, 1, d, NULL,
1278 max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
1279 max_packet_size ? NULL : dyn_buf_seek);
1280 if(!*s) {
1281 av_free(d);
1282 return AVERROR(ENOMEM);
1283 }
1284 (*s)->max_packet_size = max_packet_size;
1285 return 0;
1286}
1287
1288int avio_open_dyn_buf(AVIOContext **s)
1289{
1290 return url_open_dyn_buf_internal(s, 0);
1291}
1292
1293int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
1294{
1295 if (max_packet_size <= 0)
1296 return -1;
1297 return url_open_dyn_buf_internal(s, max_packet_size);
1298}
1299
1300int avio_get_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
1301{
1302 DynBuffer *d;
1303
1304 if (!s) {
1305 *pbuffer = NULL;
1306 return 0;
1307 }
1308
1309 avio_flush(s);
1310
1311 d = s->opaque;
1312 *pbuffer = d->buffer;
1313
1314 return d->size;
1315}
1316
1317int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
1318{
1319 DynBuffer *d;
1320 int size;
1321 static const char padbuf[AV_INPUT_BUFFER_PADDING_SIZE] = {0};
1322 int padding = 0;
1323
1324 if (!s) {
1325 *pbuffer = NULL;
1326 return 0;
1327 }
1328
1329 /* don't attempt to pad fixed-size packet buffers */
1330 if (!s->max_packet_size) {
1331 avio_write(s, padbuf, sizeof(padbuf));
1332 padding = AV_INPUT_BUFFER_PADDING_SIZE;
1333 }
1334
1335 avio_flush(s);
1336
1337 d = s->opaque;
1338 *pbuffer = d->buffer;
1339 size = d->size;
1340 av_free(d);
1341 av_free(s);
1342 return size - padding;
1343}
1344
1345void ffio_free_dyn_buf(AVIOContext **s)
1346{
1347 uint8_t *tmp;
1348 if (!*s)
1349 return;
1350 avio_close_dyn_buf(*s, &tmp);
1351 av_free(tmp);
1352 *s = NULL;
1353}
1354
1355static int null_buf_write(void *opaque, uint8_t *buf, int buf_size)
1356{
1357 DynBuffer *d = opaque;
1358
1359 d->pos += buf_size;
1360 if (d->pos > d->size)
1361 d->size = d->pos;
1362 return buf_size;
1363}
1364
1365int ffio_open_null_buf(AVIOContext **s)
1366{
1367 int ret = url_open_dyn_buf_internal(s, 0);
1368 if (ret >= 0) {
1369 AVIOContext *pb = *s;
1370 pb->write_packet = null_buf_write;
1371 }
1372 return ret;
1373}
1374
1375int ffio_close_null_buf(AVIOContext *s)
1376{
1377 DynBuffer *d = s->opaque;
1378 int size;
1379
1380 avio_flush(s);
1381
1382 size = d->size;
1383 av_free(d);
1384 av_free(s);
1385 return size;
1386}
1387
generated by cgit at 2024-05-17 06:32:37 (GMT)