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2ba45a60 DM |
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 | ||
45 | static void *ffio_url_child_next(void *obj, void *prev) | |
46 | { | |
47 | AVIOContext *s = obj; | |
48 | return prev ? NULL : s->opaque; | |
49 | } | |
50 | ||
51 | static const AVClass *ffio_url_child_class_next(const AVClass *prev) | |
52 | { | |
53 | return prev ? NULL : &ffurl_context_class; | |
54 | } | |
55 | ||
56 | static const AVOption ffio_url_options[] = { | |
57 | { NULL }, | |
58 | }; | |
59 | ||
60 | const AVClass ffio_url_class = { | |
61 | .class_name = "AVIOContext", | |
62 | .item_name = av_default_item_name, | |
63 | .version = LIBAVUTIL_VERSION_INT, | |
64 | .option = ffio_url_options, | |
65 | .child_next = ffio_url_child_next, | |
66 | .child_class_next = ffio_url_child_class_next, | |
67 | }; | |
68 | ||
69 | static void fill_buffer(AVIOContext *s); | |
70 | static int url_resetbuf(AVIOContext *s, int flags); | |
71 | ||
72 | int ffio_init_context(AVIOContext *s, | |
73 | unsigned char *buffer, | |
74 | int buffer_size, | |
75 | int write_flag, | |
76 | void *opaque, | |
77 | int (*read_packet)(void *opaque, uint8_t *buf, int buf_size), | |
78 | int (*write_packet)(void *opaque, uint8_t *buf, int buf_size), | |
79 | int64_t (*seek)(void *opaque, int64_t offset, int whence)) | |
80 | { | |
81 | s->buffer = buffer; | |
82 | s->orig_buffer_size = | |
83 | s->buffer_size = buffer_size; | |
84 | s->buf_ptr = buffer; | |
85 | s->opaque = opaque; | |
86 | s->direct = 0; | |
87 | ||
88 | url_resetbuf(s, write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ); | |
89 | ||
90 | s->write_packet = write_packet; | |
91 | s->read_packet = read_packet; | |
92 | s->seek = seek; | |
93 | s->pos = 0; | |
94 | s->must_flush = 0; | |
95 | s->eof_reached = 0; | |
96 | s->error = 0; | |
97 | s->seekable = seek ? AVIO_SEEKABLE_NORMAL : 0; | |
98 | s->max_packet_size = 0; | |
99 | s->update_checksum = NULL; | |
100 | ||
101 | if (!read_packet && !write_flag) { | |
102 | s->pos = buffer_size; | |
103 | s->buf_end = s->buffer + buffer_size; | |
104 | } | |
105 | s->read_pause = NULL; | |
106 | s->read_seek = NULL; | |
107 | ||
108 | return 0; | |
109 | } | |
110 | ||
111 | AVIOContext *avio_alloc_context( | |
112 | unsigned char *buffer, | |
113 | int buffer_size, | |
114 | int write_flag, | |
115 | void *opaque, | |
116 | int (*read_packet)(void *opaque, uint8_t *buf, int buf_size), | |
117 | int (*write_packet)(void *opaque, uint8_t *buf, int buf_size), | |
118 | int64_t (*seek)(void *opaque, int64_t offset, int whence)) | |
119 | { | |
120 | AVIOContext *s = av_mallocz(sizeof(AVIOContext)); | |
121 | if (!s) | |
122 | return NULL; | |
123 | ffio_init_context(s, buffer, buffer_size, write_flag, opaque, | |
124 | read_packet, write_packet, seek); | |
125 | return s; | |
126 | } | |
127 | ||
128 | static void writeout(AVIOContext *s, const uint8_t *data, int len) | |
129 | { | |
130 | if (s->write_packet && !s->error) { | |
131 | int ret = s->write_packet(s->opaque, (uint8_t *)data, len); | |
132 | if (ret < 0) { | |
133 | s->error = ret; | |
134 | } | |
135 | } | |
136 | s->writeout_count ++; | |
137 | s->pos += len; | |
138 | } | |
139 | ||
140 | static void flush_buffer(AVIOContext *s) | |
141 | { | |
f6fa7814 | 142 | if (s->write_flag && s->buf_ptr > s->buffer) { |
2ba45a60 DM |
143 | writeout(s, s->buffer, s->buf_ptr - s->buffer); |
144 | if (s->update_checksum) { | |
145 | s->checksum = s->update_checksum(s->checksum, s->checksum_ptr, | |
146 | s->buf_ptr - s->checksum_ptr); | |
147 | s->checksum_ptr = s->buffer; | |
148 | } | |
149 | } | |
150 | s->buf_ptr = s->buffer; | |
f6fa7814 DM |
151 | if (!s->write_flag) |
152 | s->buf_end = s->buffer; | |
2ba45a60 DM |
153 | } |
154 | ||
155 | void avio_w8(AVIOContext *s, int b) | |
156 | { | |
157 | av_assert2(b>=-128 && b<=255); | |
158 | *s->buf_ptr++ = b; | |
159 | if (s->buf_ptr >= s->buf_end) | |
160 | flush_buffer(s); | |
161 | } | |
162 | ||
163 | void ffio_fill(AVIOContext *s, int b, int count) | |
164 | { | |
165 | while (count > 0) { | |
166 | int len = FFMIN(s->buf_end - s->buf_ptr, count); | |
167 | memset(s->buf_ptr, b, len); | |
168 | s->buf_ptr += len; | |
169 | ||
170 | if (s->buf_ptr >= s->buf_end) | |
171 | flush_buffer(s); | |
172 | ||
173 | count -= len; | |
174 | } | |
175 | } | |
176 | ||
177 | void avio_write(AVIOContext *s, const unsigned char *buf, int size) | |
178 | { | |
179 | if (s->direct && !s->update_checksum) { | |
180 | avio_flush(s); | |
181 | writeout(s, buf, size); | |
182 | return; | |
183 | } | |
184 | while (size > 0) { | |
185 | int len = FFMIN(s->buf_end - s->buf_ptr, size); | |
186 | memcpy(s->buf_ptr, buf, len); | |
187 | s->buf_ptr += len; | |
188 | ||
189 | if (s->buf_ptr >= s->buf_end) | |
190 | flush_buffer(s); | |
191 | ||
192 | buf += len; | |
193 | size -= len; | |
194 | } | |
195 | } | |
196 | ||
197 | void avio_flush(AVIOContext *s) | |
198 | { | |
199 | flush_buffer(s); | |
200 | s->must_flush = 0; | |
201 | } | |
202 | ||
203 | int64_t avio_seek(AVIOContext *s, int64_t offset, int whence) | |
204 | { | |
205 | int64_t offset1; | |
206 | int64_t pos; | |
207 | int force = whence & AVSEEK_FORCE; | |
208 | int buffer_size; | |
209 | whence &= ~AVSEEK_FORCE; | |
210 | ||
211 | if(!s) | |
212 | return AVERROR(EINVAL); | |
213 | ||
214 | buffer_size = s->buf_end - s->buffer; | |
215 | pos = s->pos - (s->write_flag ? 0 : buffer_size); | |
216 | ||
217 | if (whence != SEEK_CUR && whence != SEEK_SET) | |
218 | return AVERROR(EINVAL); | |
219 | ||
220 | if (whence == SEEK_CUR) { | |
221 | offset1 = pos + (s->buf_ptr - s->buffer); | |
222 | if (offset == 0) | |
223 | return offset1; | |
224 | offset += offset1; | |
225 | } | |
226 | offset1 = offset - pos; | |
227 | if (!s->must_flush && (!s->direct || !s->seek) && | |
228 | offset1 >= 0 && offset1 <= buffer_size) { | |
229 | /* can do the seek inside the buffer */ | |
230 | s->buf_ptr = s->buffer + offset1; | |
231 | } else if ((!s->seekable || | |
232 | offset1 <= s->buf_end + SHORT_SEEK_THRESHOLD - s->buffer) && | |
233 | !s->write_flag && offset1 >= 0 && | |
234 | (!s->direct || !s->seek) && | |
235 | (whence != SEEK_END || force)) { | |
236 | while(s->pos < offset && !s->eof_reached) | |
237 | fill_buffer(s); | |
238 | if (s->eof_reached) | |
239 | return AVERROR_EOF; | |
240 | s->buf_ptr = s->buf_end + offset - s->pos; | |
241 | } else if(!s->write_flag && offset1 < 0 && -offset1 < buffer_size>>1 && s->seek && offset > 0) { | |
242 | int64_t res; | |
243 | ||
244 | pos -= FFMIN(buffer_size>>1, pos); | |
245 | if ((res = s->seek(s->opaque, pos, SEEK_SET)) < 0) | |
246 | return res; | |
247 | s->buf_end = | |
248 | s->buf_ptr = s->buffer; | |
249 | s->pos = pos; | |
250 | s->eof_reached = 0; | |
251 | fill_buffer(s); | |
252 | return avio_seek(s, offset, SEEK_SET | force); | |
253 | } else { | |
254 | int64_t res; | |
255 | if (s->write_flag) { | |
256 | flush_buffer(s); | |
257 | s->must_flush = 1; | |
258 | } | |
259 | if (!s->seek) | |
260 | return AVERROR(EPIPE); | |
261 | if ((res = s->seek(s->opaque, offset, SEEK_SET)) < 0) | |
262 | return res; | |
263 | s->seek_count ++; | |
264 | if (!s->write_flag) | |
265 | s->buf_end = s->buffer; | |
266 | s->buf_ptr = s->buffer; | |
267 | s->pos = offset; | |
268 | } | |
269 | s->eof_reached = 0; | |
270 | return offset; | |
271 | } | |
272 | ||
273 | int64_t avio_skip(AVIOContext *s, int64_t offset) | |
274 | { | |
275 | return avio_seek(s, offset, SEEK_CUR); | |
276 | } | |
277 | ||
278 | int64_t avio_size(AVIOContext *s) | |
279 | { | |
280 | int64_t size; | |
281 | ||
282 | if (!s) | |
283 | return AVERROR(EINVAL); | |
284 | ||
285 | if (!s->seek) | |
286 | return AVERROR(ENOSYS); | |
287 | size = s->seek(s->opaque, 0, AVSEEK_SIZE); | |
288 | if (size < 0) { | |
289 | if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0) | |
290 | return size; | |
291 | size++; | |
292 | s->seek(s->opaque, s->pos, SEEK_SET); | |
293 | } | |
294 | return size; | |
295 | } | |
296 | ||
297 | int avio_feof(AVIOContext *s) | |
298 | { | |
299 | if(!s) | |
300 | return 0; | |
301 | if(s->eof_reached){ | |
302 | s->eof_reached=0; | |
303 | fill_buffer(s); | |
304 | } | |
305 | return s->eof_reached; | |
306 | } | |
307 | ||
308 | #if FF_API_URL_FEOF | |
309 | int url_feof(AVIOContext *s) | |
310 | { | |
311 | return avio_feof(s); | |
312 | } | |
313 | #endif | |
314 | ||
315 | void avio_wl32(AVIOContext *s, unsigned int val) | |
316 | { | |
317 | avio_w8(s, (uint8_t) val ); | |
318 | avio_w8(s, (uint8_t)(val >> 8 )); | |
319 | avio_w8(s, (uint8_t)(val >> 16)); | |
320 | avio_w8(s, val >> 24 ); | |
321 | } | |
322 | ||
323 | void avio_wb32(AVIOContext *s, unsigned int val) | |
324 | { | |
325 | avio_w8(s, val >> 24 ); | |
326 | avio_w8(s, (uint8_t)(val >> 16)); | |
327 | avio_w8(s, (uint8_t)(val >> 8 )); | |
328 | avio_w8(s, (uint8_t) val ); | |
329 | } | |
330 | ||
331 | int avio_put_str(AVIOContext *s, const char *str) | |
332 | { | |
333 | int len = 1; | |
334 | if (str) { | |
335 | len += strlen(str); | |
336 | avio_write(s, (const unsigned char *) str, len); | |
337 | } else | |
338 | avio_w8(s, 0); | |
339 | return len; | |
340 | } | |
341 | ||
342 | int avio_put_str16le(AVIOContext *s, const char *str) | |
343 | { | |
344 | const uint8_t *q = str; | |
345 | int ret = 0; | |
346 | int err = 0; | |
347 | ||
348 | while (*q) { | |
349 | uint32_t ch; | |
350 | uint16_t tmp; | |
351 | ||
352 | GET_UTF8(ch, *q++, goto invalid;) | |
353 | PUT_UTF16(ch, tmp, avio_wl16(s, tmp); ret += 2;) | |
354 | continue; | |
355 | invalid: | |
356 | av_log(s, AV_LOG_ERROR, "Invaid UTF8 sequence in avio_put_str16le\n"); | |
357 | err = AVERROR(EINVAL); | |
358 | } | |
359 | avio_wl16(s, 0); | |
360 | if (err) | |
361 | return err; | |
362 | ret += 2; | |
363 | return ret; | |
364 | } | |
365 | ||
366 | int ff_get_v_length(uint64_t val) | |
367 | { | |
368 | int i = 1; | |
369 | ||
370 | while (val >>= 7) | |
371 | i++; | |
372 | ||
373 | return i; | |
374 | } | |
375 | ||
376 | void ff_put_v(AVIOContext *bc, uint64_t val) | |
377 | { | |
378 | int i = ff_get_v_length(val); | |
379 | ||
380 | while (--i > 0) | |
381 | avio_w8(bc, 128 | (uint8_t)(val >> (7*i))); | |
382 | ||
383 | avio_w8(bc, val & 127); | |
384 | } | |
385 | ||
386 | void avio_wl64(AVIOContext *s, uint64_t val) | |
387 | { | |
388 | avio_wl32(s, (uint32_t)(val & 0xffffffff)); | |
389 | avio_wl32(s, (uint32_t)(val >> 32)); | |
390 | } | |
391 | ||
392 | void avio_wb64(AVIOContext *s, uint64_t val) | |
393 | { | |
394 | avio_wb32(s, (uint32_t)(val >> 32)); | |
395 | avio_wb32(s, (uint32_t)(val & 0xffffffff)); | |
396 | } | |
397 | ||
398 | void avio_wl16(AVIOContext *s, unsigned int val) | |
399 | { | |
400 | avio_w8(s, (uint8_t)val); | |
401 | avio_w8(s, (int)val >> 8); | |
402 | } | |
403 | ||
404 | void avio_wb16(AVIOContext *s, unsigned int val) | |
405 | { | |
406 | avio_w8(s, (int)val >> 8); | |
407 | avio_w8(s, (uint8_t)val); | |
408 | } | |
409 | ||
410 | void avio_wl24(AVIOContext *s, unsigned int val) | |
411 | { | |
412 | avio_wl16(s, val & 0xffff); | |
413 | avio_w8(s, (int)val >> 16); | |
414 | } | |
415 | ||
416 | void avio_wb24(AVIOContext *s, unsigned int val) | |
417 | { | |
418 | avio_wb16(s, (int)val >> 8); | |
419 | avio_w8(s, (uint8_t)val); | |
420 | } | |
421 | ||
422 | /* Input stream */ | |
423 | ||
424 | static void fill_buffer(AVIOContext *s) | |
425 | { | |
426 | int max_buffer_size = s->max_packet_size ? | |
427 | s->max_packet_size : IO_BUFFER_SIZE; | |
428 | uint8_t *dst = s->buf_end - s->buffer + max_buffer_size < s->buffer_size ? | |
429 | s->buf_end : s->buffer; | |
430 | int len = s->buffer_size - (dst - s->buffer); | |
431 | ||
432 | /* can't fill the buffer without read_packet, just set EOF if appropriate */ | |
433 | if (!s->read_packet && s->buf_ptr >= s->buf_end) | |
434 | s->eof_reached = 1; | |
435 | ||
436 | /* no need to do anything if EOF already reached */ | |
437 | if (s->eof_reached) | |
438 | return; | |
439 | ||
440 | if (s->update_checksum && dst == s->buffer) { | |
441 | if (s->buf_end > s->checksum_ptr) | |
442 | s->checksum = s->update_checksum(s->checksum, s->checksum_ptr, | |
443 | s->buf_end - s->checksum_ptr); | |
444 | s->checksum_ptr = s->buffer; | |
445 | } | |
446 | ||
447 | /* make buffer smaller in case it ended up large after probing */ | |
448 | if (s->read_packet && s->orig_buffer_size && s->buffer_size > s->orig_buffer_size) { | |
449 | if (dst == s->buffer) { | |
450 | ffio_set_buf_size(s, s->orig_buffer_size); | |
451 | ||
452 | s->checksum_ptr = dst = s->buffer; | |
453 | } | |
454 | av_assert0(len >= s->orig_buffer_size); | |
455 | len = s->orig_buffer_size; | |
456 | } | |
457 | ||
458 | if (s->read_packet) | |
459 | len = s->read_packet(s->opaque, dst, len); | |
460 | else | |
461 | len = 0; | |
462 | if (len <= 0) { | |
463 | /* do not modify buffer if EOF reached so that a seek back can | |
464 | be done without rereading data */ | |
465 | s->eof_reached = 1; | |
466 | if (len < 0) | |
467 | s->error = len; | |
468 | } else { | |
469 | s->pos += len; | |
470 | s->buf_ptr = dst; | |
471 | s->buf_end = dst + len; | |
472 | s->bytes_read += len; | |
473 | } | |
474 | } | |
475 | ||
476 | unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf, | |
477 | unsigned int len) | |
478 | { | |
479 | return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len); | |
480 | } | |
481 | ||
482 | unsigned long ff_crcA001_update(unsigned long checksum, const uint8_t *buf, | |
483 | unsigned int len) | |
484 | { | |
485 | return av_crc(av_crc_get_table(AV_CRC_16_ANSI_LE), checksum, buf, len); | |
486 | } | |
487 | ||
488 | unsigned long ffio_get_checksum(AVIOContext *s) | |
489 | { | |
490 | s->checksum = s->update_checksum(s->checksum, s->checksum_ptr, | |
491 | s->buf_ptr - s->checksum_ptr); | |
492 | s->update_checksum = NULL; | |
493 | return s->checksum; | |
494 | } | |
495 | ||
496 | void ffio_init_checksum(AVIOContext *s, | |
497 | unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len), | |
498 | unsigned long checksum) | |
499 | { | |
500 | s->update_checksum = update_checksum; | |
501 | if (s->update_checksum) { | |
502 | s->checksum = checksum; | |
503 | s->checksum_ptr = s->buf_ptr; | |
504 | } | |
505 | } | |
506 | ||
507 | /* XXX: put an inline version */ | |
508 | int avio_r8(AVIOContext *s) | |
509 | { | |
510 | if (s->buf_ptr >= s->buf_end) | |
511 | fill_buffer(s); | |
512 | if (s->buf_ptr < s->buf_end) | |
513 | return *s->buf_ptr++; | |
514 | return 0; | |
515 | } | |
516 | ||
517 | int avio_read(AVIOContext *s, unsigned char *buf, int size) | |
518 | { | |
519 | int len, size1; | |
520 | ||
521 | size1 = size; | |
522 | while (size > 0) { | |
523 | len = s->buf_end - s->buf_ptr; | |
524 | if (len > size) | |
525 | len = size; | |
526 | if (len == 0 || s->write_flag) { | |
527 | if((s->direct || size > s->buffer_size) && !s->update_checksum){ | |
528 | if(s->read_packet) | |
529 | len = s->read_packet(s->opaque, buf, size); | |
530 | if (len <= 0) { | |
531 | /* do not modify buffer if EOF reached so that a seek back can | |
532 | be done without rereading data */ | |
533 | s->eof_reached = 1; | |
534 | if(len<0) | |
535 | s->error= len; | |
536 | break; | |
537 | } else { | |
538 | s->pos += len; | |
539 | s->bytes_read += len; | |
540 | size -= len; | |
541 | buf += len; | |
542 | s->buf_ptr = s->buffer; | |
543 | s->buf_end = s->buffer/* + len*/; | |
544 | } | |
545 | } else { | |
546 | fill_buffer(s); | |
547 | len = s->buf_end - s->buf_ptr; | |
548 | if (len == 0) | |
549 | break; | |
550 | } | |
551 | } else { | |
552 | memcpy(buf, s->buf_ptr, len); | |
553 | buf += len; | |
554 | s->buf_ptr += len; | |
555 | size -= len; | |
556 | } | |
557 | } | |
558 | if (size1 == size) { | |
559 | if (s->error) return s->error; | |
560 | if (avio_feof(s)) return AVERROR_EOF; | |
561 | } | |
562 | return size1 - size; | |
563 | } | |
564 | ||
565 | int ffio_read_indirect(AVIOContext *s, unsigned char *buf, int size, const unsigned char **data) | |
566 | { | |
567 | if (s->buf_end - s->buf_ptr >= size && !s->write_flag) { | |
568 | *data = s->buf_ptr; | |
569 | s->buf_ptr += size; | |
570 | return size; | |
571 | } else { | |
572 | *data = buf; | |
573 | return avio_read(s, buf, size); | |
574 | } | |
575 | } | |
576 | ||
577 | int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size) | |
578 | { | |
579 | int len; | |
580 | ||
581 | if (size < 0) | |
582 | return -1; | |
583 | ||
584 | if (s->read_packet && s->write_flag) { | |
585 | len = s->read_packet(s->opaque, buf, size); | |
586 | if (len > 0) | |
587 | s->pos += len; | |
588 | return len; | |
589 | } | |
590 | ||
591 | len = s->buf_end - s->buf_ptr; | |
592 | if (len == 0) { | |
593 | /* Reset the buf_end pointer to the start of the buffer, to make sure | |
594 | * the fill_buffer call tries to read as much data as fits into the | |
595 | * full buffer, instead of just what space is left after buf_end. | |
596 | * This avoids returning partial packets at the end of the buffer, | |
597 | * for packet based inputs. | |
598 | */ | |
599 | s->buf_end = s->buf_ptr = s->buffer; | |
600 | fill_buffer(s); | |
601 | len = s->buf_end - s->buf_ptr; | |
602 | } | |
603 | if (len > size) | |
604 | len = size; | |
605 | memcpy(buf, s->buf_ptr, len); | |
606 | s->buf_ptr += len; | |
607 | if (!len) { | |
608 | if (s->error) return s->error; | |
609 | if (avio_feof(s)) return AVERROR_EOF; | |
610 | } | |
611 | return len; | |
612 | } | |
613 | ||
614 | unsigned int avio_rl16(AVIOContext *s) | |
615 | { | |
616 | unsigned int val; | |
617 | val = avio_r8(s); | |
618 | val |= avio_r8(s) << 8; | |
619 | return val; | |
620 | } | |
621 | ||
622 | unsigned int avio_rl24(AVIOContext *s) | |
623 | { | |
624 | unsigned int val; | |
625 | val = avio_rl16(s); | |
626 | val |= avio_r8(s) << 16; | |
627 | return val; | |
628 | } | |
629 | ||
630 | unsigned int avio_rl32(AVIOContext *s) | |
631 | { | |
632 | unsigned int val; | |
633 | val = avio_rl16(s); | |
634 | val |= avio_rl16(s) << 16; | |
635 | return val; | |
636 | } | |
637 | ||
638 | uint64_t avio_rl64(AVIOContext *s) | |
639 | { | |
640 | uint64_t val; | |
641 | val = (uint64_t)avio_rl32(s); | |
642 | val |= (uint64_t)avio_rl32(s) << 32; | |
643 | return val; | |
644 | } | |
645 | ||
646 | unsigned int avio_rb16(AVIOContext *s) | |
647 | { | |
648 | unsigned int val; | |
649 | val = avio_r8(s) << 8; | |
650 | val |= avio_r8(s); | |
651 | return val; | |
652 | } | |
653 | ||
654 | unsigned int avio_rb24(AVIOContext *s) | |
655 | { | |
656 | unsigned int val; | |
657 | val = avio_rb16(s) << 8; | |
658 | val |= avio_r8(s); | |
659 | return val; | |
660 | } | |
661 | unsigned int avio_rb32(AVIOContext *s) | |
662 | { | |
663 | unsigned int val; | |
664 | val = avio_rb16(s) << 16; | |
665 | val |= avio_rb16(s); | |
666 | return val; | |
667 | } | |
668 | ||
669 | int ff_get_line(AVIOContext *s, char *buf, int maxlen) | |
670 | { | |
671 | int i = 0; | |
672 | char c; | |
673 | ||
674 | do { | |
675 | c = avio_r8(s); | |
676 | if (c && i < maxlen-1) | |
677 | buf[i++] = c; | |
678 | } while (c != '\n' && c != '\r' && c); | |
f6fa7814 | 679 | if (c == '\r' && avio_r8(s) != '\n' && !avio_feof(s)) |
2ba45a60 DM |
680 | avio_skip(s, -1); |
681 | ||
682 | buf[i] = 0; | |
683 | return i; | |
684 | } | |
685 | ||
686 | int avio_get_str(AVIOContext *s, int maxlen, char *buf, int buflen) | |
687 | { | |
688 | int i; | |
689 | ||
690 | if (buflen <= 0) | |
691 | return AVERROR(EINVAL); | |
692 | // reserve 1 byte for terminating 0 | |
693 | buflen = FFMIN(buflen - 1, maxlen); | |
694 | for (i = 0; i < buflen; i++) | |
695 | if (!(buf[i] = avio_r8(s))) | |
696 | return i + 1; | |
697 | buf[i] = 0; | |
698 | for (; i < maxlen; i++) | |
699 | if (!avio_r8(s)) | |
700 | return i + 1; | |
701 | return maxlen; | |
702 | } | |
703 | ||
704 | #define GET_STR16(type, read) \ | |
705 | int avio_get_str16 ##type(AVIOContext *pb, int maxlen, char *buf, int buflen)\ | |
706 | {\ | |
707 | char* q = buf;\ | |
708 | int ret = 0;\ | |
709 | if (buflen <= 0) \ | |
710 | return AVERROR(EINVAL); \ | |
711 | while (ret + 1 < maxlen) {\ | |
712 | uint8_t tmp;\ | |
713 | uint32_t ch;\ | |
714 | GET_UTF16(ch, (ret += 2) <= maxlen ? read(pb) : 0, break;)\ | |
715 | if (!ch)\ | |
716 | break;\ | |
717 | PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)\ | |
718 | }\ | |
719 | *q = 0;\ | |
720 | return ret;\ | |
721 | }\ | |
722 | ||
723 | GET_STR16(le, avio_rl16) | |
724 | GET_STR16(be, avio_rb16) | |
725 | ||
726 | #undef GET_STR16 | |
727 | ||
728 | uint64_t avio_rb64(AVIOContext *s) | |
729 | { | |
730 | uint64_t val; | |
731 | val = (uint64_t)avio_rb32(s) << 32; | |
732 | val |= (uint64_t)avio_rb32(s); | |
733 | return val; | |
734 | } | |
735 | ||
736 | uint64_t ffio_read_varlen(AVIOContext *bc){ | |
737 | uint64_t val = 0; | |
738 | int tmp; | |
739 | ||
740 | do{ | |
741 | tmp = avio_r8(bc); | |
742 | val= (val<<7) + (tmp&127); | |
743 | }while(tmp&128); | |
744 | return val; | |
745 | } | |
746 | ||
747 | int ffio_fdopen(AVIOContext **s, URLContext *h) | |
748 | { | |
749 | uint8_t *buffer; | |
750 | int buffer_size, max_packet_size; | |
751 | ||
752 | max_packet_size = h->max_packet_size; | |
753 | if (max_packet_size) { | |
754 | buffer_size = max_packet_size; /* no need to bufferize more than one packet */ | |
755 | } else { | |
756 | buffer_size = IO_BUFFER_SIZE; | |
757 | } | |
758 | buffer = av_malloc(buffer_size); | |
759 | if (!buffer) | |
760 | return AVERROR(ENOMEM); | |
761 | ||
762 | *s = avio_alloc_context(buffer, buffer_size, h->flags & AVIO_FLAG_WRITE, h, | |
763 | (void*)ffurl_read, (void*)ffurl_write, (void*)ffurl_seek); | |
764 | if (!*s) { | |
765 | av_free(buffer); | |
766 | return AVERROR(ENOMEM); | |
767 | } | |
768 | (*s)->direct = h->flags & AVIO_FLAG_DIRECT; | |
769 | (*s)->seekable = h->is_streamed ? 0 : AVIO_SEEKABLE_NORMAL; | |
770 | (*s)->max_packet_size = max_packet_size; | |
771 | if(h->prot) { | |
772 | (*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause; | |
773 | (*s)->read_seek = (int64_t (*)(void *, int, int64_t, int))h->prot->url_read_seek; | |
774 | } | |
775 | (*s)->av_class = &ffio_url_class; | |
776 | return 0; | |
777 | } | |
778 | ||
779 | int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size) | |
780 | { | |
781 | uint8_t *buffer; | |
782 | int max_buffer_size = s->max_packet_size ? | |
783 | s->max_packet_size : IO_BUFFER_SIZE; | |
784 | int filled = s->buf_end - s->buffer; | |
785 | ||
786 | buf_size += s->buf_ptr - s->buffer + max_buffer_size; | |
787 | ||
788 | if (buf_size < filled || s->seekable) | |
789 | return 0; | |
790 | av_assert0(!s->write_flag); | |
791 | ||
792 | buffer = av_malloc(buf_size); | |
793 | if (!buffer) | |
794 | return AVERROR(ENOMEM); | |
795 | ||
796 | memcpy(buffer, s->buffer, filled); | |
797 | av_free(s->buffer); | |
798 | s->buf_ptr = buffer + (s->buf_ptr - s->buffer); | |
799 | s->buf_end = buffer + (s->buf_end - s->buffer); | |
800 | s->buffer = buffer; | |
801 | s->buffer_size = buf_size; | |
802 | return 0; | |
803 | } | |
804 | ||
805 | int ffio_set_buf_size(AVIOContext *s, int buf_size) | |
806 | { | |
807 | uint8_t *buffer; | |
808 | buffer = av_malloc(buf_size); | |
809 | if (!buffer) | |
810 | return AVERROR(ENOMEM); | |
811 | ||
812 | av_free(s->buffer); | |
813 | s->buffer = buffer; | |
814 | s->orig_buffer_size = | |
815 | s->buffer_size = buf_size; | |
816 | s->buf_ptr = buffer; | |
817 | url_resetbuf(s, s->write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ); | |
818 | return 0; | |
819 | } | |
820 | ||
821 | static int url_resetbuf(AVIOContext *s, int flags) | |
822 | { | |
823 | av_assert1(flags == AVIO_FLAG_WRITE || flags == AVIO_FLAG_READ); | |
824 | ||
825 | if (flags & AVIO_FLAG_WRITE) { | |
826 | s->buf_end = s->buffer + s->buffer_size; | |
827 | s->write_flag = 1; | |
828 | } else { | |
829 | s->buf_end = s->buffer; | |
830 | s->write_flag = 0; | |
831 | } | |
832 | return 0; | |
833 | } | |
834 | ||
835 | int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char **bufp, int buf_size) | |
836 | { | |
837 | int64_t buffer_start; | |
838 | int buffer_size; | |
839 | int overlap, new_size, alloc_size; | |
840 | uint8_t *buf = *bufp; | |
841 | ||
842 | if (s->write_flag) { | |
843 | av_freep(bufp); | |
844 | return AVERROR(EINVAL); | |
845 | } | |
846 | ||
847 | buffer_size = s->buf_end - s->buffer; | |
848 | ||
849 | /* the buffers must touch or overlap */ | |
850 | if ((buffer_start = s->pos - buffer_size) > buf_size) { | |
851 | av_freep(bufp); | |
852 | return AVERROR(EINVAL); | |
853 | } | |
854 | ||
855 | overlap = buf_size - buffer_start; | |
856 | new_size = buf_size + buffer_size - overlap; | |
857 | ||
858 | alloc_size = FFMAX(s->buffer_size, new_size); | |
859 | if (alloc_size > buf_size) | |
860 | if (!(buf = (*bufp) = av_realloc_f(buf, 1, alloc_size))) | |
861 | return AVERROR(ENOMEM); | |
862 | ||
863 | if (new_size > buf_size) { | |
864 | memcpy(buf + buf_size, s->buffer + overlap, buffer_size - overlap); | |
865 | buf_size = new_size; | |
866 | } | |
867 | ||
868 | av_free(s->buffer); | |
869 | s->buf_ptr = s->buffer = buf; | |
870 | s->buffer_size = alloc_size; | |
871 | s->pos = buf_size; | |
872 | s->buf_end = s->buf_ptr + buf_size; | |
873 | s->eof_reached = 0; | |
874 | s->must_flush = 0; | |
875 | ||
876 | return 0; | |
877 | } | |
878 | ||
879 | int avio_open(AVIOContext **s, const char *filename, int flags) | |
880 | { | |
881 | return avio_open2(s, filename, flags, NULL, NULL); | |
882 | } | |
883 | ||
884 | int avio_open2(AVIOContext **s, const char *filename, int flags, | |
885 | const AVIOInterruptCB *int_cb, AVDictionary **options) | |
886 | { | |
887 | URLContext *h; | |
888 | int err; | |
889 | ||
890 | err = ffurl_open(&h, filename, flags, int_cb, options); | |
891 | if (err < 0) | |
892 | return err; | |
893 | err = ffio_fdopen(s, h); | |
894 | if (err < 0) { | |
895 | ffurl_close(h); | |
896 | return err; | |
897 | } | |
898 | return 0; | |
899 | } | |
900 | ||
901 | int avio_close(AVIOContext *s) | |
902 | { | |
903 | URLContext *h; | |
904 | ||
905 | if (!s) | |
906 | return 0; | |
907 | ||
908 | avio_flush(s); | |
909 | h = s->opaque; | |
910 | av_freep(&s->buffer); | |
911 | if (s->write_flag) | |
912 | av_log(s, AV_LOG_DEBUG, "Statistics: %d seeks, %d writeouts\n", s->seek_count, s->writeout_count); | |
913 | else | |
914 | av_log(s, AV_LOG_DEBUG, "Statistics: %"PRId64" bytes read, %d seeks\n", s->bytes_read, s->seek_count); | |
915 | av_free(s); | |
916 | return ffurl_close(h); | |
917 | } | |
918 | ||
919 | int avio_closep(AVIOContext **s) | |
920 | { | |
921 | int ret = avio_close(*s); | |
922 | *s = NULL; | |
923 | return ret; | |
924 | } | |
925 | ||
926 | int avio_printf(AVIOContext *s, const char *fmt, ...) | |
927 | { | |
928 | va_list ap; | |
929 | char buf[4096]; | |
930 | int ret; | |
931 | ||
932 | va_start(ap, fmt); | |
933 | ret = vsnprintf(buf, sizeof(buf), fmt, ap); | |
934 | va_end(ap); | |
935 | avio_write(s, buf, strlen(buf)); | |
936 | return ret; | |
937 | } | |
938 | ||
939 | int avio_pause(AVIOContext *s, int pause) | |
940 | { | |
941 | if (!s->read_pause) | |
942 | return AVERROR(ENOSYS); | |
943 | return s->read_pause(s->opaque, pause); | |
944 | } | |
945 | ||
946 | int64_t avio_seek_time(AVIOContext *s, int stream_index, | |
947 | int64_t timestamp, int flags) | |
948 | { | |
949 | URLContext *h = s->opaque; | |
950 | int64_t ret; | |
951 | if (!s->read_seek) | |
952 | return AVERROR(ENOSYS); | |
953 | ret = s->read_seek(h, stream_index, timestamp, flags); | |
954 | if (ret >= 0) { | |
955 | int64_t pos; | |
956 | s->buf_ptr = s->buf_end; // Flush buffer | |
957 | pos = s->seek(h, 0, SEEK_CUR); | |
958 | if (pos >= 0) | |
959 | s->pos = pos; | |
960 | else if (pos != AVERROR(ENOSYS)) | |
961 | ret = pos; | |
962 | } | |
963 | return ret; | |
964 | } | |
965 | ||
966 | int avio_read_to_bprint(AVIOContext *h, AVBPrint *pb, size_t max_size) | |
967 | { | |
968 | int ret; | |
969 | char buf[1024]; | |
970 | while (max_size) { | |
971 | ret = avio_read(h, buf, FFMIN(max_size, sizeof(buf))); | |
972 | if (ret == AVERROR_EOF) | |
973 | return 0; | |
974 | if (ret <= 0) | |
975 | return ret; | |
976 | av_bprint_append_data(pb, buf, ret); | |
977 | if (!av_bprint_is_complete(pb)) | |
978 | return AVERROR(ENOMEM); | |
979 | max_size -= ret; | |
980 | } | |
981 | return 0; | |
982 | } | |
983 | ||
984 | /* output in a dynamic buffer */ | |
985 | ||
986 | typedef struct DynBuffer { | |
987 | int pos, size, allocated_size; | |
988 | uint8_t *buffer; | |
989 | int io_buffer_size; | |
990 | uint8_t io_buffer[1]; | |
991 | } DynBuffer; | |
992 | ||
993 | static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size) | |
994 | { | |
995 | DynBuffer *d = opaque; | |
996 | unsigned new_size, new_allocated_size; | |
997 | ||
998 | /* reallocate buffer if needed */ | |
999 | new_size = d->pos + buf_size; | |
1000 | new_allocated_size = d->allocated_size; | |
1001 | if (new_size < d->pos || new_size > INT_MAX/2) | |
1002 | return -1; | |
1003 | while (new_size > new_allocated_size) { | |
1004 | if (!new_allocated_size) | |
1005 | new_allocated_size = new_size; | |
1006 | else | |
1007 | new_allocated_size += new_allocated_size / 2 + 1; | |
1008 | } | |
1009 | ||
1010 | if (new_allocated_size > d->allocated_size) { | |
1011 | int err; | |
1012 | if ((err = av_reallocp(&d->buffer, new_allocated_size)) < 0) { | |
1013 | d->allocated_size = 0; | |
1014 | d->size = 0; | |
1015 | return err; | |
1016 | } | |
1017 | d->allocated_size = new_allocated_size; | |
1018 | } | |
1019 | memcpy(d->buffer + d->pos, buf, buf_size); | |
1020 | d->pos = new_size; | |
1021 | if (d->pos > d->size) | |
1022 | d->size = d->pos; | |
1023 | return buf_size; | |
1024 | } | |
1025 | ||
1026 | static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size) | |
1027 | { | |
1028 | unsigned char buf1[4]; | |
1029 | int ret; | |
1030 | ||
1031 | /* packetized write: output the header */ | |
1032 | AV_WB32(buf1, buf_size); | |
1033 | ret = dyn_buf_write(opaque, buf1, 4); | |
1034 | if (ret < 0) | |
1035 | return ret; | |
1036 | ||
1037 | /* then the data */ | |
1038 | return dyn_buf_write(opaque, buf, buf_size); | |
1039 | } | |
1040 | ||
1041 | static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence) | |
1042 | { | |
1043 | DynBuffer *d = opaque; | |
1044 | ||
1045 | if (whence == SEEK_CUR) | |
1046 | offset += d->pos; | |
1047 | else if (whence == SEEK_END) | |
1048 | offset += d->size; | |
1049 | if (offset < 0 || offset > 0x7fffffffLL) | |
1050 | return -1; | |
1051 | d->pos = offset; | |
1052 | return 0; | |
1053 | } | |
1054 | ||
1055 | static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size) | |
1056 | { | |
1057 | DynBuffer *d; | |
1058 | unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024; | |
1059 | ||
1060 | if (sizeof(DynBuffer) + io_buffer_size < io_buffer_size) | |
1061 | return -1; | |
1062 | d = av_mallocz(sizeof(DynBuffer) + io_buffer_size); | |
1063 | if (!d) | |
1064 | return AVERROR(ENOMEM); | |
1065 | d->io_buffer_size = io_buffer_size; | |
1066 | *s = avio_alloc_context(d->io_buffer, d->io_buffer_size, 1, d, NULL, | |
1067 | max_packet_size ? dyn_packet_buf_write : dyn_buf_write, | |
1068 | max_packet_size ? NULL : dyn_buf_seek); | |
1069 | if(!*s) { | |
1070 | av_free(d); | |
1071 | return AVERROR(ENOMEM); | |
1072 | } | |
1073 | (*s)->max_packet_size = max_packet_size; | |
1074 | return 0; | |
1075 | } | |
1076 | ||
1077 | int avio_open_dyn_buf(AVIOContext **s) | |
1078 | { | |
1079 | return url_open_dyn_buf_internal(s, 0); | |
1080 | } | |
1081 | ||
1082 | int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size) | |
1083 | { | |
1084 | if (max_packet_size <= 0) | |
1085 | return -1; | |
1086 | return url_open_dyn_buf_internal(s, max_packet_size); | |
1087 | } | |
1088 | ||
1089 | int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer) | |
1090 | { | |
1091 | DynBuffer *d; | |
1092 | int size; | |
1093 | static const char padbuf[FF_INPUT_BUFFER_PADDING_SIZE] = {0}; | |
1094 | int padding = 0; | |
1095 | ||
1096 | if (!s) { | |
1097 | *pbuffer = NULL; | |
1098 | return 0; | |
1099 | } | |
2ba45a60 DM |
1100 | |
1101 | /* don't attempt to pad fixed-size packet buffers */ | |
1102 | if (!s->max_packet_size) { | |
1103 | avio_write(s, padbuf, sizeof(padbuf)); | |
1104 | padding = FF_INPUT_BUFFER_PADDING_SIZE; | |
1105 | } | |
1106 | ||
1107 | avio_flush(s); | |
1108 | ||
f6fa7814 | 1109 | d = s->opaque; |
2ba45a60 DM |
1110 | *pbuffer = d->buffer; |
1111 | size = d->size; | |
1112 | av_free(d); | |
1113 | av_free(s); | |
1114 | return size - padding; | |
1115 | } | |
1116 | ||
1117 | static int null_buf_write(void *opaque, uint8_t *buf, int buf_size) | |
1118 | { | |
1119 | DynBuffer *d = opaque; | |
1120 | ||
1121 | d->pos += buf_size; | |
1122 | if (d->pos > d->size) | |
1123 | d->size = d->pos; | |
1124 | return buf_size; | |
1125 | } | |
1126 | ||
1127 | int ffio_open_null_buf(AVIOContext **s) | |
1128 | { | |
1129 | int ret = url_open_dyn_buf_internal(s, 0); | |
1130 | if (ret >= 0) { | |
1131 | AVIOContext *pb = *s; | |
1132 | pb->write_packet = null_buf_write; | |
1133 | } | |
1134 | return ret; | |
1135 | } | |
1136 | ||
1137 | int ffio_close_null_buf(AVIOContext *s) | |
1138 | { | |
1139 | DynBuffer *d = s->opaque; | |
1140 | int size; | |
1141 | ||
1142 | avio_flush(s); | |
1143 | ||
1144 | size = d->size; | |
1145 | av_free(d); | |
1146 | av_free(s); | |
1147 | return size; | |
1148 | } |