1 /*
2 * unbuffered I/O
3 * Copyright (c) 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/avstring.h"
23 #include "libavutil/dict.h"
24 #include "libavutil/opt.h"
25 #include "libavutil/time.h"
26 #include "libavutil/avassert.h"
27 #include "os_support.h"
28 #include "avformat.h"
29 #include "internal.h"
30 #if CONFIG_NETWORK
31 #include "network.h"
32 #endif
33 #include "url.h"
34
35 /** @name Logging context. */
36 /*@{*/
urlcontext_to_name(void * ptr)37 static const char *urlcontext_to_name(void *ptr)
38 {
39 URLContext *h = (URLContext *)ptr;
40 if (h->prot)
41 return h->prot->name;
42 else
43 return "NULL";
44 }
45
urlcontext_child_next(void * obj,void * prev)46 static void *urlcontext_child_next(void *obj, void *prev)
47 {
48 URLContext *h = obj;
49 if (!prev && h->priv_data && h->prot->priv_data_class)
50 return h->priv_data;
51 return NULL;
52 }
53
54 #define OFFSET(x) offsetof(URLContext,x)
55 #define E AV_OPT_FLAG_ENCODING_PARAM
56 #define D AV_OPT_FLAG_DECODING_PARAM
57 static const AVOption options[] = {
58 {"protocol_whitelist", "List of protocols that are allowed to be used", OFFSET(protocol_whitelist), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, D },
59 {"protocol_blacklist", "List of protocols that are not allowed to be used", OFFSET(protocol_blacklist), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, D },
60 {"rw_timeout", "Timeout for IO operations (in microseconds)", offsetof(URLContext, rw_timeout), AV_OPT_TYPE_INT64, { .i64 = 0 }, 0, INT64_MAX, AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_DECODING_PARAM },
61 { NULL }
62 };
63
64 const AVClass ffurl_context_class = {
65 .class_name = "URLContext",
66 .item_name = urlcontext_to_name,
67 .option = options,
68 .version = LIBAVUTIL_VERSION_INT,
69 .child_next = urlcontext_child_next,
70 #if FF_API_CHILD_CLASS_NEXT
71 .child_class_next = ff_urlcontext_child_class_next,
72 #endif
73 .child_class_iterate = ff_urlcontext_child_class_iterate,
74 };
75 /*@}*/
76
url_alloc_for_protocol(URLContext ** puc,const URLProtocol * up,const char * filename,int flags,const AVIOInterruptCB * int_cb)77 static int url_alloc_for_protocol(URLContext **puc, const URLProtocol *up,
78 const char *filename, int flags,
79 const AVIOInterruptCB *int_cb)
80 {
81 URLContext *uc;
82 int err;
83
84 #if CONFIG_NETWORK
85 if (up->flags & URL_PROTOCOL_FLAG_NETWORK && !ff_network_init())
86 return AVERROR(EIO);
87 #endif
88 if ((flags & AVIO_FLAG_READ) && !up->url_read) {
89 av_log(NULL, AV_LOG_ERROR,
90 "Impossible to open the '%s' protocol for reading\n", up->name);
91 return AVERROR(EIO);
92 }
93 if ((flags & AVIO_FLAG_WRITE) && !up->url_write) {
94 av_log(NULL, AV_LOG_ERROR,
95 "Impossible to open the '%s' protocol for writing\n", up->name);
96 return AVERROR(EIO);
97 }
98 uc = av_mallocz(sizeof(URLContext) + strlen(filename) + 1);
99 if (!uc) {
100 err = AVERROR(ENOMEM);
101 goto fail;
102 }
103 uc->av_class = &ffurl_context_class;
104 uc->filename = (char *)&uc[1];
105 strcpy(uc->filename, filename);
106 uc->prot = up;
107 uc->flags = flags;
108 uc->is_streamed = 0; /* default = not streamed */
109 uc->max_packet_size = 0; /* default: stream file */
110 if (up->priv_data_size) {
111 uc->priv_data = av_mallocz(up->priv_data_size);
112 if (!uc->priv_data) {
113 err = AVERROR(ENOMEM);
114 goto fail;
115 }
116 if (up->priv_data_class) {
117 char *start;
118 *(const AVClass **)uc->priv_data = up->priv_data_class;
119 av_opt_set_defaults(uc->priv_data);
120 if (av_strstart(uc->filename, up->name, (const char**)&start) && *start == ',') {
121 int ret= 0;
122 char *p= start;
123 char sep= *++p;
124 char *key, *val;
125 p++;
126
127 if (strcmp(up->name, "subfile"))
128 ret = AVERROR(EINVAL);
129
130 while(ret >= 0 && (key= strchr(p, sep)) && p<key && (val = strchr(key+1, sep))){
131 *val= *key= 0;
132 if (strcmp(p, "start") && strcmp(p, "end")) {
133 ret = AVERROR_OPTION_NOT_FOUND;
134 } else
135 ret= av_opt_set(uc->priv_data, p, key+1, 0);
136 if (ret == AVERROR_OPTION_NOT_FOUND)
137 av_log(uc, AV_LOG_ERROR, "Key '%s' not found.\n", p);
138 *val= *key= sep;
139 p= val+1;
140 }
141 if(ret<0 || p!=key){
142 av_log(uc, AV_LOG_ERROR, "Error parsing options string %s\n", start);
143 av_freep(&uc->priv_data);
144 av_freep(&uc);
145 err = AVERROR(EINVAL);
146 goto fail;
147 }
148 memmove(start, key+1, strlen(key));
149 }
150 }
151 }
152 if (int_cb)
153 uc->interrupt_callback = *int_cb;
154
155 *puc = uc;
156 return 0;
157 fail:
158 *puc = NULL;
159 if (uc)
160 av_freep(&uc->priv_data);
161 av_freep(&uc);
162 #if CONFIG_NETWORK
163 if (up->flags & URL_PROTOCOL_FLAG_NETWORK)
164 ff_network_close();
165 #endif
166 return err;
167 }
168
ffurl_connect(URLContext * uc,AVDictionary ** options)169 int ffurl_connect(URLContext *uc, AVDictionary **options)
170 {
171 int err;
172 AVDictionary *tmp_opts = NULL;
173 AVDictionaryEntry *e;
174
175 if (!options)
176 options = &tmp_opts;
177
178 // Check that URLContext was initialized correctly and lists are matching if set
179 av_assert0(!(e=av_dict_get(*options, "protocol_whitelist", NULL, 0)) ||
180 (uc->protocol_whitelist && !strcmp(uc->protocol_whitelist, e->value)));
181 av_assert0(!(e=av_dict_get(*options, "protocol_blacklist", NULL, 0)) ||
182 (uc->protocol_blacklist && !strcmp(uc->protocol_blacklist, e->value)));
183
184 if (uc->protocol_whitelist && av_match_list(uc->prot->name, uc->protocol_whitelist, ',') <= 0) {
185 av_log(uc, AV_LOG_ERROR, "Protocol '%s' not on whitelist '%s'!\n", uc->prot->name, uc->protocol_whitelist);
186 return AVERROR(EINVAL);
187 }
188
189 if (uc->protocol_blacklist && av_match_list(uc->prot->name, uc->protocol_blacklist, ',') > 0) {
190 av_log(uc, AV_LOG_ERROR, "Protocol '%s' on blacklist '%s'!\n", uc->prot->name, uc->protocol_blacklist);
191 return AVERROR(EINVAL);
192 }
193
194 if (!uc->protocol_whitelist && uc->prot->default_whitelist) {
195 av_log(uc, AV_LOG_DEBUG, "Setting default whitelist '%s'\n", uc->prot->default_whitelist);
196 uc->protocol_whitelist = av_strdup(uc->prot->default_whitelist);
197 if (!uc->protocol_whitelist) {
198 return AVERROR(ENOMEM);
199 }
200 } else if (!uc->protocol_whitelist)
201 av_log(uc, AV_LOG_DEBUG, "No default whitelist set\n"); // This should be an error once all declare a default whitelist
202
203 if ((err = av_dict_set(options, "protocol_whitelist", uc->protocol_whitelist, 0)) < 0)
204 return err;
205 if ((err = av_dict_set(options, "protocol_blacklist", uc->protocol_blacklist, 0)) < 0)
206 return err;
207
208 err =
209 uc->prot->url_open2 ? uc->prot->url_open2(uc,
210 uc->filename,
211 uc->flags,
212 options) :
213 uc->prot->url_open(uc, uc->filename, uc->flags);
214
215 av_dict_set(options, "protocol_whitelist", NULL, 0);
216 av_dict_set(options, "protocol_blacklist", NULL, 0);
217
218 if (err)
219 return err;
220 uc->is_connected = 1;
221 /* We must be careful here as ffurl_seek() could be slow,
222 * for example for http */
223 if ((uc->flags & AVIO_FLAG_WRITE) || !strcmp(uc->prot->name, "file"))
224 if (!uc->is_streamed && ffurl_seek(uc, 0, SEEK_SET) < 0)
225 uc->is_streamed = 1;
226 return 0;
227 }
228
ffurl_accept(URLContext * s,URLContext ** c)229 int ffurl_accept(URLContext *s, URLContext **c)
230 {
231 av_assert0(!*c);
232 if (s->prot->url_accept)
233 return s->prot->url_accept(s, c);
234 return AVERROR(EBADF);
235 }
236
ffurl_handshake(URLContext * c)237 int ffurl_handshake(URLContext *c)
238 {
239 int ret;
240 if (c->prot->url_handshake) {
241 ret = c->prot->url_handshake(c);
242 if (ret)
243 return ret;
244 }
245 c->is_connected = 1;
246 return 0;
247 }
248
249 #define URL_SCHEME_CHARS \
250 "abcdefghijklmnopqrstuvwxyz" \
251 "ABCDEFGHIJKLMNOPQRSTUVWXYZ" \
252 "0123456789+-."
253
url_find_protocol(const char * filename)254 static const struct URLProtocol *url_find_protocol(const char *filename)
255 {
256 const URLProtocol **protocols;
257 char proto_str[128], proto_nested[128], *ptr;
258 size_t proto_len = strspn(filename, URL_SCHEME_CHARS);
259 int i;
260
261 if (filename[proto_len] != ':' &&
262 (strncmp(filename, "subfile,", 8) || !strchr(filename + proto_len + 1, ':')) ||
263 is_dos_path(filename))
264 strcpy(proto_str, "file");
265 else
266 av_strlcpy(proto_str, filename,
267 FFMIN(proto_len + 1, sizeof(proto_str)));
268
269 av_strlcpy(proto_nested, proto_str, sizeof(proto_nested));
270 if ((ptr = strchr(proto_nested, '+')))
271 *ptr = '\0';
272
273 protocols = ffurl_get_protocols(NULL, NULL);
274 if (!protocols)
275 return NULL;
276 for (i = 0; protocols[i]; i++) {
277 const URLProtocol *up = protocols[i];
278 if (!strcmp(proto_str, up->name)) {
279 av_freep(&protocols);
280 return up;
281 }
282 if (up->flags & URL_PROTOCOL_FLAG_NESTED_SCHEME &&
283 !strcmp(proto_nested, up->name)) {
284 av_freep(&protocols);
285 return up;
286 }
287 }
288 av_freep(&protocols);
289 if (av_strstart(filename, "https:", NULL) || av_strstart(filename, "tls:", NULL))
290 av_log(NULL, AV_LOG_WARNING, "https protocol not found, recompile FFmpeg with "
291 "openssl, gnutls or securetransport enabled.\n");
292
293 return NULL;
294 }
295
ffurl_alloc(URLContext ** puc,const char * filename,int flags,const AVIOInterruptCB * int_cb)296 int ffurl_alloc(URLContext **puc, const char *filename, int flags,
297 const AVIOInterruptCB *int_cb)
298 {
299 const URLProtocol *p = NULL;
300
301 p = url_find_protocol(filename);
302 if (p)
303 return url_alloc_for_protocol(puc, p, filename, flags, int_cb);
304
305 *puc = NULL;
306 return AVERROR_PROTOCOL_NOT_FOUND;
307 }
308
ffurl_open_whitelist(URLContext ** puc,const char * filename,int flags,const AVIOInterruptCB * int_cb,AVDictionary ** options,const char * whitelist,const char * blacklist,URLContext * parent)309 int ffurl_open_whitelist(URLContext **puc, const char *filename, int flags,
310 const AVIOInterruptCB *int_cb, AVDictionary **options,
311 const char *whitelist, const char* blacklist,
312 URLContext *parent)
313 {
314 AVDictionary *tmp_opts = NULL;
315 AVDictionaryEntry *e;
316 int ret = ffurl_alloc(puc, filename, flags, int_cb);
317 if (ret < 0)
318 return ret;
319 if (parent) {
320 ret = av_opt_copy(*puc, parent);
321 if (ret < 0)
322 goto fail;
323 }
324 if (options &&
325 (ret = av_opt_set_dict(*puc, options)) < 0)
326 goto fail;
327 if (options && (*puc)->prot->priv_data_class &&
328 (ret = av_opt_set_dict((*puc)->priv_data, options)) < 0)
329 goto fail;
330
331 if (!options)
332 options = &tmp_opts;
333
334 av_assert0(!whitelist ||
335 !(e=av_dict_get(*options, "protocol_whitelist", NULL, 0)) ||
336 !strcmp(whitelist, e->value));
337 av_assert0(!blacklist ||
338 !(e=av_dict_get(*options, "protocol_blacklist", NULL, 0)) ||
339 !strcmp(blacklist, e->value));
340
341 if ((ret = av_dict_set(options, "protocol_whitelist", whitelist, 0)) < 0)
342 goto fail;
343
344 if ((ret = av_dict_set(options, "protocol_blacklist", blacklist, 0)) < 0)
345 goto fail;
346
347 if ((ret = av_opt_set_dict(*puc, options)) < 0)
348 goto fail;
349
350 ret = ffurl_connect(*puc, options);
351
352 if (!ret)
353 return 0;
354 fail:
355 ffurl_closep(puc);
356 return ret;
357 }
358
retry_transfer_wrapper(URLContext * h,uint8_t * buf,int size,int size_min,int (* transfer_func)(URLContext * h,uint8_t * buf,int size))359 static inline int retry_transfer_wrapper(URLContext *h, uint8_t *buf,
360 int size, int size_min,
361 int (*transfer_func)(URLContext *h,
362 uint8_t *buf,
363 int size))
364 {
365 int ret, len;
366 int fast_retries = 5;
367 int64_t wait_since = 0;
368
369 len = 0;
370 while (len < size_min) {
371 if (ff_check_interrupt(&h->interrupt_callback))
372 return AVERROR_EXIT;
373 ret = transfer_func(h, buf + len, size - len);
374 if (ret == AVERROR(EINTR))
375 continue;
376 if (h->flags & AVIO_FLAG_NONBLOCK)
377 return ret;
378 if (ret == AVERROR(EAGAIN)) {
379 ret = 0;
380 if (fast_retries) {
381 fast_retries--;
382 } else {
383 if (h->rw_timeout) {
384 if (!wait_since)
385 wait_since = av_gettime_relative();
386 else if (av_gettime_relative() > wait_since + h->rw_timeout)
387 return AVERROR(EIO);
388 }
389 av_usleep(1000);
390 }
391 } else if (ret == AVERROR_EOF)
392 return (len > 0) ? len : AVERROR_EOF;
393 else if (ret < 0)
394 return ret;
395 if (ret) {
396 fast_retries = FFMAX(fast_retries, 2);
397 wait_since = 0;
398 }
399 len += ret;
400 }
401 return len;
402 }
403
ffurl_read(URLContext * h,unsigned char * buf,int size)404 int ffurl_read(URLContext *h, unsigned char *buf, int size)
405 {
406 if (!(h->flags & AVIO_FLAG_READ))
407 return AVERROR(EIO);
408 return retry_transfer_wrapper(h, buf, size, 1, h->prot->url_read);
409 }
410
ffurl_read_complete(URLContext * h,unsigned char * buf,int size)411 int ffurl_read_complete(URLContext *h, unsigned char *buf, int size)
412 {
413 if (!(h->flags & AVIO_FLAG_READ))
414 return AVERROR(EIO);
415 return retry_transfer_wrapper(h, buf, size, size, h->prot->url_read);
416 }
417
ffurl_write(URLContext * h,const unsigned char * buf,int size)418 int ffurl_write(URLContext *h, const unsigned char *buf, int size)
419 {
420 if (!(h->flags & AVIO_FLAG_WRITE))
421 return AVERROR(EIO);
422 /* avoid sending too big packets */
423 if (h->max_packet_size && size > h->max_packet_size)
424 return AVERROR(EIO);
425
426 return retry_transfer_wrapper(h, (unsigned char *)buf, size, size,
427 (int (*)(struct URLContext *, uint8_t *, int))
428 h->prot->url_write);
429 }
430
ffurl_seek(URLContext * h,int64_t pos,int whence)431 int64_t ffurl_seek(URLContext *h, int64_t pos, int whence)
432 {
433 int64_t ret;
434
435 if (!h->prot->url_seek)
436 return AVERROR(ENOSYS);
437 ret = h->prot->url_seek(h, pos, whence & ~AVSEEK_FORCE);
438 return ret;
439 }
440
ffurl_closep(URLContext ** hh)441 int ffurl_closep(URLContext **hh)
442 {
443 URLContext *h= *hh;
444 int ret = 0;
445 if (!h)
446 return 0; /* can happen when ffurl_open fails */
447
448 if (h->is_connected && h->prot->url_close)
449 ret = h->prot->url_close(h);
450 #if CONFIG_NETWORK
451 if (h->prot->flags & URL_PROTOCOL_FLAG_NETWORK)
452 ff_network_close();
453 #endif
454 if (h->prot->priv_data_size) {
455 if (h->prot->priv_data_class)
456 av_opt_free(h->priv_data);
457 av_freep(&h->priv_data);
458 }
459 av_opt_free(h);
460 av_freep(hh);
461 return ret;
462 }
463
ffurl_close(URLContext * h)464 int ffurl_close(URLContext *h)
465 {
466 return ffurl_closep(&h);
467 }
468
469
avio_find_protocol_name(const char * url)470 const char *avio_find_protocol_name(const char *url)
471 {
472 const URLProtocol *p = url_find_protocol(url);
473
474 return p ? p->name : NULL;
475 }
476
avio_check(const char * url,int flags)477 int avio_check(const char *url, int flags)
478 {
479 URLContext *h;
480 int ret = ffurl_alloc(&h, url, flags, NULL);
481 if (ret < 0)
482 return ret;
483
484 if (h->prot->url_check) {
485 ret = h->prot->url_check(h, flags);
486 } else {
487 ret = ffurl_connect(h, NULL);
488 if (ret >= 0)
489 ret = flags;
490 }
491
492 ffurl_close(h);
493 return ret;
494 }
495
avpriv_io_move(const char * url_src,const char * url_dst)496 int avpriv_io_move(const char *url_src, const char *url_dst)
497 {
498 URLContext *h_src, *h_dst;
499 int ret = ffurl_alloc(&h_src, url_src, AVIO_FLAG_READ_WRITE, NULL);
500 if (ret < 0)
501 return ret;
502 ret = ffurl_alloc(&h_dst, url_dst, AVIO_FLAG_WRITE, NULL);
503 if (ret < 0) {
504 ffurl_close(h_src);
505 return ret;
506 }
507
508 if (h_src->prot == h_dst->prot && h_src->prot->url_move)
509 ret = h_src->prot->url_move(h_src, h_dst);
510 else
511 ret = AVERROR(ENOSYS);
512
513 ffurl_close(h_src);
514 ffurl_close(h_dst);
515 return ret;
516 }
517
avpriv_io_delete(const char * url)518 int avpriv_io_delete(const char *url)
519 {
520 URLContext *h;
521 int ret = ffurl_alloc(&h, url, AVIO_FLAG_WRITE, NULL);
522 if (ret < 0)
523 return ret;
524
525 if (h->prot->url_delete)
526 ret = h->prot->url_delete(h);
527 else
528 ret = AVERROR(ENOSYS);
529
530 ffurl_close(h);
531 return ret;
532 }
533
avio_open_dir(AVIODirContext ** s,const char * url,AVDictionary ** options)534 int avio_open_dir(AVIODirContext **s, const char *url, AVDictionary **options)
535 {
536 URLContext *h = NULL;
537 AVIODirContext *ctx = NULL;
538 int ret;
539 av_assert0(s);
540
541 ctx = av_mallocz(sizeof(*ctx));
542 if (!ctx) {
543 ret = AVERROR(ENOMEM);
544 goto fail;
545 }
546
547 if ((ret = ffurl_alloc(&h, url, AVIO_FLAG_READ, NULL)) < 0)
548 goto fail;
549
550 if (h->prot->url_open_dir && h->prot->url_read_dir && h->prot->url_close_dir) {
551 if (options && h->prot->priv_data_class &&
552 (ret = av_opt_set_dict(h->priv_data, options)) < 0)
553 goto fail;
554 ret = h->prot->url_open_dir(h);
555 } else
556 ret = AVERROR(ENOSYS);
557 if (ret < 0)
558 goto fail;
559
560 h->is_connected = 1;
561 ctx->url_context = h;
562 *s = ctx;
563 return 0;
564
565 fail:
566 av_free(ctx);
567 *s = NULL;
568 ffurl_close(h);
569 return ret;
570 }
571
avio_read_dir(AVIODirContext * s,AVIODirEntry ** next)572 int avio_read_dir(AVIODirContext *s, AVIODirEntry **next)
573 {
574 URLContext *h;
575 int ret;
576
577 if (!s || !s->url_context)
578 return AVERROR(EINVAL);
579 h = s->url_context;
580 if ((ret = h->prot->url_read_dir(h, next)) < 0)
581 avio_free_directory_entry(next);
582 return ret;
583 }
584
avio_close_dir(AVIODirContext ** s)585 int avio_close_dir(AVIODirContext **s)
586 {
587 URLContext *h;
588
589 av_assert0(s);
590 if (!(*s) || !(*s)->url_context)
591 return AVERROR(EINVAL);
592 h = (*s)->url_context;
593 h->prot->url_close_dir(h);
594 ffurl_close(h);
595 av_freep(s);
596 *s = NULL;
597 return 0;
598 }
599
avio_free_directory_entry(AVIODirEntry ** entry)600 void avio_free_directory_entry(AVIODirEntry **entry)
601 {
602 if (!entry || !*entry)
603 return;
604 av_free((*entry)->name);
605 av_freep(entry);
606 }
607
ffurl_size(URLContext * h)608 int64_t ffurl_size(URLContext *h)
609 {
610 int64_t pos, size;
611
612 size = ffurl_seek(h, 0, AVSEEK_SIZE);
613 if (size < 0) {
614 pos = ffurl_seek(h, 0, SEEK_CUR);
615 if ((size = ffurl_seek(h, -1, SEEK_END)) < 0)
616 return size;
617 size++;
618 ffurl_seek(h, pos, SEEK_SET);
619 }
620 return size;
621 }
622
ffurl_get_file_handle(URLContext * h)623 int ffurl_get_file_handle(URLContext *h)
624 {
625 if (!h || !h->prot || !h->prot->url_get_file_handle)
626 return -1;
627 return h->prot->url_get_file_handle(h);
628 }
629
ffurl_get_multi_file_handle(URLContext * h,int ** handles,int * numhandles)630 int ffurl_get_multi_file_handle(URLContext *h, int **handles, int *numhandles)
631 {
632 if (!h || !h->prot)
633 return AVERROR(ENOSYS);
634 if (!h->prot->url_get_multi_file_handle) {
635 if (!h->prot->url_get_file_handle)
636 return AVERROR(ENOSYS);
637 *handles = av_malloc(sizeof(**handles));
638 if (!*handles)
639 return AVERROR(ENOMEM);
640 *numhandles = 1;
641 *handles[0] = h->prot->url_get_file_handle(h);
642 return 0;
643 }
644 return h->prot->url_get_multi_file_handle(h, handles, numhandles);
645 }
646
ffurl_get_short_seek(URLContext * h)647 int ffurl_get_short_seek(URLContext *h)
648 {
649 if (!h || !h->prot || !h->prot->url_get_short_seek)
650 return AVERROR(ENOSYS);
651 return h->prot->url_get_short_seek(h);
652 }
653
ffurl_shutdown(URLContext * h,int flags)654 int ffurl_shutdown(URLContext *h, int flags)
655 {
656 if (!h || !h->prot || !h->prot->url_shutdown)
657 return AVERROR(ENOSYS);
658 return h->prot->url_shutdown(h, flags);
659 }
660
ff_check_interrupt(AVIOInterruptCB * cb)661 int ff_check_interrupt(AVIOInterruptCB *cb)
662 {
663 if (cb && cb->callback)
664 return cb->callback(cb->opaque);
665 return 0;
666 }
667
ff_rename(const char * url_src,const char * url_dst,void * logctx)668 int ff_rename(const char *url_src, const char *url_dst, void *logctx)
669 {
670 int ret = avpriv_io_move(url_src, url_dst);
671 if (ret < 0)
672 av_log(logctx, AV_LOG_ERROR, "failed to rename file %s to %s: %s\n", url_src, url_dst, av_err2str(ret));
673 return ret;
674 }
675