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 .child_class_next = ff_urlcontext_child_class_next,
71 };
72 /*@}*/
73
url_alloc_for_protocol(URLContext ** puc,const URLProtocol * up,const char * filename,int flags,const AVIOInterruptCB * int_cb)74 static int url_alloc_for_protocol(URLContext **puc, const URLProtocol *up,
75 const char *filename, int flags,
76 const AVIOInterruptCB *int_cb)
77 {
78 URLContext *uc;
79 int err;
80
81 #if CONFIG_NETWORK
82 if (up->flags & URL_PROTOCOL_FLAG_NETWORK && !ff_network_init())
83 return AVERROR(EIO);
84 #endif
85 if ((flags & AVIO_FLAG_READ) && !up->url_read) {
86 av_log(NULL, AV_LOG_ERROR,
87 "Impossible to open the '%s' protocol for reading\n", up->name);
88 return AVERROR(EIO);
89 }
90 if ((flags & AVIO_FLAG_WRITE) && !up->url_write) {
91 av_log(NULL, AV_LOG_ERROR,
92 "Impossible to open the '%s' protocol for writing\n", up->name);
93 return AVERROR(EIO);
94 }
95 uc = av_mallocz(sizeof(URLContext) + strlen(filename) + 1);
96 if (!uc) {
97 err = AVERROR(ENOMEM);
98 goto fail;
99 }
100 uc->av_class = &ffurl_context_class;
101 uc->filename = (char *)&uc[1];
102 strcpy(uc->filename, filename);
103 uc->prot = up;
104 uc->flags = flags;
105 uc->is_streamed = 0; /* default = not streamed */
106 uc->max_packet_size = 0; /* default: stream file */
107 if (up->priv_data_size) {
108 uc->priv_data = av_mallocz(up->priv_data_size);
109 if (!uc->priv_data) {
110 err = AVERROR(ENOMEM);
111 goto fail;
112 }
113 if (up->priv_data_class) {
114 int proto_len= strlen(up->name);
115 char *start = strchr(uc->filename, ',');
116 *(const AVClass **)uc->priv_data = up->priv_data_class;
117 av_opt_set_defaults(uc->priv_data);
118 if(!strncmp(up->name, uc->filename, proto_len) && uc->filename + proto_len == start){
119 int ret= 0;
120 char *p= start;
121 char sep= *++p;
122 char *key, *val;
123 p++;
124
125 if (strcmp(up->name, "subfile"))
126 ret = AVERROR(EINVAL);
127
128 while(ret >= 0 && (key= strchr(p, sep)) && p<key && (val = strchr(key+1, sep))){
129 *val= *key= 0;
130 if (strcmp(p, "start") && strcmp(p, "end")) {
131 ret = AVERROR_OPTION_NOT_FOUND;
132 } else
133 ret= av_opt_set(uc->priv_data, p, key+1, 0);
134 if (ret == AVERROR_OPTION_NOT_FOUND)
135 av_log(uc, AV_LOG_ERROR, "Key '%s' not found.\n", p);
136 *val= *key= sep;
137 p= val+1;
138 }
139 if(ret<0 || p!=key){
140 av_log(uc, AV_LOG_ERROR, "Error parsing options string %s\n", start);
141 av_freep(&uc->priv_data);
142 av_freep(&uc);
143 err = AVERROR(EINVAL);
144 goto fail;
145 }
146 memmove(start, key+1, strlen(key));
147 }
148 }
149 }
150 if (int_cb)
151 uc->interrupt_callback = *int_cb;
152
153 *puc = uc;
154 return 0;
155 fail:
156 *puc = NULL;
157 if (uc)
158 av_freep(&uc->priv_data);
159 av_freep(&uc);
160 #if CONFIG_NETWORK
161 if (up->flags & URL_PROTOCOL_FLAG_NETWORK)
162 ff_network_close();
163 #endif
164 return err;
165 }
166
ffurl_connect(URLContext * uc,AVDictionary ** options)167 int ffurl_connect(URLContext *uc, AVDictionary **options)
168 {
169 int err;
170 AVDictionary *tmp_opts = NULL;
171 AVDictionaryEntry *e;
172
173 if (!options)
174 options = &tmp_opts;
175
176 // Check that URLContext was initialized correctly and lists are matching if set
177 av_assert0(!(e=av_dict_get(*options, "protocol_whitelist", NULL, 0)) ||
178 (uc->protocol_whitelist && !strcmp(uc->protocol_whitelist, e->value)));
179 av_assert0(!(e=av_dict_get(*options, "protocol_blacklist", NULL, 0)) ||
180 (uc->protocol_blacklist && !strcmp(uc->protocol_blacklist, e->value)));
181
182 if (uc->protocol_whitelist && av_match_list(uc->prot->name, uc->protocol_whitelist, ',') <= 0) {
183 av_log(uc, AV_LOG_ERROR, "Protocol '%s' not on whitelist '%s'!\n", uc->prot->name, uc->protocol_whitelist);
184 return AVERROR(EINVAL);
185 }
186
187 if (uc->protocol_blacklist && av_match_list(uc->prot->name, uc->protocol_blacklist, ',') > 0) {
188 av_log(uc, AV_LOG_ERROR, "Protocol '%s' on blacklist '%s'!\n", uc->prot->name, uc->protocol_blacklist);
189 return AVERROR(EINVAL);
190 }
191
192 if (!uc->protocol_whitelist && uc->prot->default_whitelist) {
193 av_log(uc, AV_LOG_DEBUG, "Setting default whitelist '%s'\n", uc->prot->default_whitelist);
194 uc->protocol_whitelist = av_strdup(uc->prot->default_whitelist);
195 if (!uc->protocol_whitelist) {
196 return AVERROR(ENOMEM);
197 }
198 } else if (!uc->protocol_whitelist)
199 av_log(uc, AV_LOG_DEBUG, "No default whitelist set\n"); // This should be an error once all declare a default whitelist
200
201 if ((err = av_dict_set(options, "protocol_whitelist", uc->protocol_whitelist, 0)) < 0)
202 return err;
203 if ((err = av_dict_set(options, "protocol_blacklist", uc->protocol_blacklist, 0)) < 0)
204 return err;
205
206 err =
207 uc->prot->url_open2 ? uc->prot->url_open2(uc,
208 uc->filename,
209 uc->flags,
210 options) :
211 uc->prot->url_open(uc, uc->filename, uc->flags);
212
213 av_dict_set(options, "protocol_whitelist", NULL, 0);
214 av_dict_set(options, "protocol_blacklist", NULL, 0);
215
216 if (err)
217 return err;
218 uc->is_connected = 1;
219 /* We must be careful here as ffurl_seek() could be slow,
220 * for example for http */
221 if ((uc->flags & AVIO_FLAG_WRITE) || !strcmp(uc->prot->name, "file"))
222 if (!uc->is_streamed && ffurl_seek(uc, 0, SEEK_SET) < 0)
223 uc->is_streamed = 1;
224 return 0;
225 }
226
ffurl_accept(URLContext * s,URLContext ** c)227 int ffurl_accept(URLContext *s, URLContext **c)
228 {
229 av_assert0(!*c);
230 if (s->prot->url_accept)
231 return s->prot->url_accept(s, c);
232 return AVERROR(EBADF);
233 }
234
ffurl_handshake(URLContext * c)235 int ffurl_handshake(URLContext *c)
236 {
237 int ret;
238 if (c->prot->url_handshake) {
239 ret = c->prot->url_handshake(c);
240 if (ret)
241 return ret;
242 }
243 c->is_connected = 1;
244 return 0;
245 }
246
247 #define URL_SCHEME_CHARS \
248 "abcdefghijklmnopqrstuvwxyz" \
249 "ABCDEFGHIJKLMNOPQRSTUVWXYZ" \
250 "0123456789+-."
251
url_find_protocol(const char * filename)252 static const struct URLProtocol *url_find_protocol(const char *filename)
253 {
254 const URLProtocol **protocols;
255 char proto_str[128], proto_nested[128], *ptr;
256 size_t proto_len = strspn(filename, URL_SCHEME_CHARS);
257 int i;
258
259 if (filename[proto_len] != ':' &&
260 (strncmp(filename, "subfile,", 8) || !strchr(filename + proto_len + 1, ':')) ||
261 is_dos_path(filename))
262 strcpy(proto_str, "file");
263 else
264 av_strlcpy(proto_str, filename,
265 FFMIN(proto_len + 1, sizeof(proto_str)));
266
267 av_strlcpy(proto_nested, proto_str, sizeof(proto_nested));
268 if ((ptr = strchr(proto_nested, '+')))
269 *ptr = '\0';
270
271 protocols = ffurl_get_protocols(NULL, NULL);
272 if (!protocols)
273 return NULL;
274 for (i = 0; protocols[i]; i++) {
275 const URLProtocol *up = protocols[i];
276 if (!strcmp(proto_str, up->name)) {
277 av_freep(&protocols);
278 return up;
279 }
280 if (up->flags & URL_PROTOCOL_FLAG_NESTED_SCHEME &&
281 !strcmp(proto_nested, up->name)) {
282 av_freep(&protocols);
283 return up;
284 }
285 }
286 av_freep(&protocols);
287 if (av_strstart(filename, "https:", NULL) || av_strstart(filename, "tls:", NULL))
288 av_log(NULL, AV_LOG_WARNING, "https protocol not found, recompile FFmpeg with "
289 "openssl, gnutls or securetransport enabled.\n");
290
291 return NULL;
292 }
293
ffurl_alloc(URLContext ** puc,const char * filename,int flags,const AVIOInterruptCB * int_cb)294 int ffurl_alloc(URLContext **puc, const char *filename, int flags,
295 const AVIOInterruptCB *int_cb)
296 {
297 const URLProtocol *p = NULL;
298
299 p = url_find_protocol(filename);
300 if (p)
301 return url_alloc_for_protocol(puc, p, filename, flags, int_cb);
302
303 *puc = NULL;
304 return AVERROR_PROTOCOL_NOT_FOUND;
305 }
306
ffurl_open_whitelist(URLContext ** puc,const char * filename,int flags,const AVIOInterruptCB * int_cb,AVDictionary ** options,const char * whitelist,const char * blacklist,URLContext * parent)307 int ffurl_open_whitelist(URLContext **puc, const char *filename, int flags,
308 const AVIOInterruptCB *int_cb, AVDictionary **options,
309 const char *whitelist, const char* blacklist,
310 URLContext *parent)
311 {
312 AVDictionary *tmp_opts = NULL;
313 AVDictionaryEntry *e;
314 int ret = ffurl_alloc(puc, filename, flags, int_cb);
315 if (ret < 0)
316 return ret;
317 if (parent)
318 av_opt_copy(*puc, parent);
319 if (options &&
320 (ret = av_opt_set_dict(*puc, options)) < 0)
321 goto fail;
322 if (options && (*puc)->prot->priv_data_class &&
323 (ret = av_opt_set_dict((*puc)->priv_data, options)) < 0)
324 goto fail;
325
326 if (!options)
327 options = &tmp_opts;
328
329 av_assert0(!whitelist ||
330 !(e=av_dict_get(*options, "protocol_whitelist", NULL, 0)) ||
331 !strcmp(whitelist, e->value));
332 av_assert0(!blacklist ||
333 !(e=av_dict_get(*options, "protocol_blacklist", NULL, 0)) ||
334 !strcmp(blacklist, e->value));
335
336 if ((ret = av_dict_set(options, "protocol_whitelist", whitelist, 0)) < 0)
337 goto fail;
338
339 if ((ret = av_dict_set(options, "protocol_blacklist", blacklist, 0)) < 0)
340 goto fail;
341
342 if ((ret = av_opt_set_dict(*puc, options)) < 0)
343 goto fail;
344
345 ret = ffurl_connect(*puc, options);
346
347 if (!ret)
348 return 0;
349 fail:
350 ffurl_closep(puc);
351 return ret;
352 }
353
ffurl_open(URLContext ** puc,const char * filename,int flags,const AVIOInterruptCB * int_cb,AVDictionary ** options)354 int ffurl_open(URLContext **puc, const char *filename, int flags,
355 const AVIOInterruptCB *int_cb, AVDictionary **options)
356 {
357 return ffurl_open_whitelist(puc, filename, flags,
358 int_cb, options, NULL, NULL, NULL);
359 }
360
retry_transfer_wrapper(URLContext * h,uint8_t * buf,int size,int size_min,int (* transfer_func)(URLContext * h,uint8_t * buf,int size))361 static inline int retry_transfer_wrapper(URLContext *h, uint8_t *buf,
362 int size, int size_min,
363 int (*transfer_func)(URLContext *h,
364 uint8_t *buf,
365 int size))
366 {
367 int ret, len;
368 int fast_retries = 5;
369 int64_t wait_since = 0;
370
371 len = 0;
372 while (len < size_min) {
373 if (ff_check_interrupt(&h->interrupt_callback))
374 return AVERROR_EXIT;
375 ret = transfer_func(h, buf + len, size - len);
376 if (ret == AVERROR(EINTR))
377 continue;
378 if (h->flags & AVIO_FLAG_NONBLOCK)
379 return ret;
380 if (ret == AVERROR(EAGAIN)) {
381 ret = 0;
382 if (fast_retries) {
383 fast_retries--;
384 } else {
385 if (h->rw_timeout) {
386 if (!wait_since)
387 wait_since = av_gettime_relative();
388 else if (av_gettime_relative() > wait_since + h->rw_timeout)
389 return AVERROR(EIO);
390 }
391 av_usleep(1000);
392 }
393 } else if (ret == AVERROR_EOF)
394 return (len > 0) ? len : AVERROR_EOF;
395 else if (ret < 0)
396 return ret;
397 if (ret) {
398 fast_retries = FFMAX(fast_retries, 2);
399 wait_since = 0;
400 }
401 len += ret;
402 }
403 return len;
404 }
405
ffurl_read(URLContext * h,unsigned char * buf,int size)406 int ffurl_read(URLContext *h, unsigned char *buf, int size)
407 {
408 if (!(h->flags & AVIO_FLAG_READ))
409 return AVERROR(EIO);
410 return retry_transfer_wrapper(h, buf, size, 1, h->prot->url_read);
411 }
412
ffurl_read_complete(URLContext * h,unsigned char * buf,int size)413 int ffurl_read_complete(URLContext *h, unsigned char *buf, int size)
414 {
415 if (!(h->flags & AVIO_FLAG_READ))
416 return AVERROR(EIO);
417 return retry_transfer_wrapper(h, buf, size, size, h->prot->url_read);
418 }
419
ffurl_write(URLContext * h,const unsigned char * buf,int size)420 int ffurl_write(URLContext *h, const unsigned char *buf, int size)
421 {
422 if (!(h->flags & AVIO_FLAG_WRITE))
423 return AVERROR(EIO);
424 /* avoid sending too big packets */
425 if (h->max_packet_size && size > h->max_packet_size)
426 return AVERROR(EIO);
427
428 return retry_transfer_wrapper(h, (unsigned char *)buf, size, size,
429 (int (*)(struct URLContext *, uint8_t *, int))
430 h->prot->url_write);
431 }
432
ffurl_seek(URLContext * h,int64_t pos,int whence)433 int64_t ffurl_seek(URLContext *h, int64_t pos, int whence)
434 {
435 int64_t ret;
436
437 if (!h->prot->url_seek)
438 return AVERROR(ENOSYS);
439 ret = h->prot->url_seek(h, pos, whence & ~AVSEEK_FORCE);
440 return ret;
441 }
442
ffurl_closep(URLContext ** hh)443 int ffurl_closep(URLContext **hh)
444 {
445 URLContext *h= *hh;
446 int ret = 0;
447 if (!h)
448 return 0; /* can happen when ffurl_open fails */
449
450 if (h->is_connected && h->prot->url_close)
451 ret = h->prot->url_close(h);
452 #if CONFIG_NETWORK
453 if (h->prot->flags & URL_PROTOCOL_FLAG_NETWORK)
454 ff_network_close();
455 #endif
456 if (h->prot->priv_data_size) {
457 if (h->prot->priv_data_class)
458 av_opt_free(h->priv_data);
459 av_freep(&h->priv_data);
460 }
461 av_opt_free(h);
462 av_freep(hh);
463 return ret;
464 }
465
ffurl_close(URLContext * h)466 int ffurl_close(URLContext *h)
467 {
468 return ffurl_closep(&h);
469 }
470
471
avio_find_protocol_name(const char * url)472 const char *avio_find_protocol_name(const char *url)
473 {
474 const URLProtocol *p = url_find_protocol(url);
475
476 return p ? p->name : NULL;
477 }
478
avio_check(const char * url,int flags)479 int avio_check(const char *url, int flags)
480 {
481 URLContext *h;
482 int ret = ffurl_alloc(&h, url, flags, NULL);
483 if (ret < 0)
484 return ret;
485
486 if (h->prot->url_check) {
487 ret = h->prot->url_check(h, flags);
488 } else {
489 ret = ffurl_connect(h, NULL);
490 if (ret >= 0)
491 ret = flags;
492 }
493
494 ffurl_close(h);
495 return ret;
496 }
497
avpriv_io_move(const char * url_src,const char * url_dst)498 int avpriv_io_move(const char *url_src, const char *url_dst)
499 {
500 URLContext *h_src, *h_dst;
501 int ret = ffurl_alloc(&h_src, url_src, AVIO_FLAG_READ_WRITE, NULL);
502 if (ret < 0)
503 return ret;
504 ret = ffurl_alloc(&h_dst, url_dst, AVIO_FLAG_WRITE, NULL);
505 if (ret < 0) {
506 ffurl_close(h_src);
507 return ret;
508 }
509
510 if (h_src->prot == h_dst->prot && h_src->prot->url_move)
511 ret = h_src->prot->url_move(h_src, h_dst);
512 else
513 ret = AVERROR(ENOSYS);
514
515 ffurl_close(h_src);
516 ffurl_close(h_dst);
517 return ret;
518 }
519
avpriv_io_delete(const char * url)520 int avpriv_io_delete(const char *url)
521 {
522 URLContext *h;
523 int ret = ffurl_alloc(&h, url, AVIO_FLAG_WRITE, NULL);
524 if (ret < 0)
525 return ret;
526
527 if (h->prot->url_delete)
528 ret = h->prot->url_delete(h);
529 else
530 ret = AVERROR(ENOSYS);
531
532 ffurl_close(h);
533 return ret;
534 }
535
avio_open_dir(AVIODirContext ** s,const char * url,AVDictionary ** options)536 int avio_open_dir(AVIODirContext **s, const char *url, AVDictionary **options)
537 {
538 URLContext *h = NULL;
539 AVIODirContext *ctx = NULL;
540 int ret;
541 av_assert0(s);
542
543 ctx = av_mallocz(sizeof(*ctx));
544 if (!ctx) {
545 ret = AVERROR(ENOMEM);
546 goto fail;
547 }
548
549 if ((ret = ffurl_alloc(&h, url, AVIO_FLAG_READ, NULL)) < 0)
550 goto fail;
551
552 if (h->prot->url_open_dir && h->prot->url_read_dir && h->prot->url_close_dir) {
553 if (options && h->prot->priv_data_class &&
554 (ret = av_opt_set_dict(h->priv_data, options)) < 0)
555 goto fail;
556 ret = h->prot->url_open_dir(h);
557 } else
558 ret = AVERROR(ENOSYS);
559 if (ret < 0)
560 goto fail;
561
562 h->is_connected = 1;
563 ctx->url_context = h;
564 *s = ctx;
565 return 0;
566
567 fail:
568 av_free(ctx);
569 *s = NULL;
570 ffurl_close(h);
571 return ret;
572 }
573
avio_read_dir(AVIODirContext * s,AVIODirEntry ** next)574 int avio_read_dir(AVIODirContext *s, AVIODirEntry **next)
575 {
576 URLContext *h;
577 int ret;
578
579 if (!s || !s->url_context)
580 return AVERROR(EINVAL);
581 h = s->url_context;
582 if ((ret = h->prot->url_read_dir(h, next)) < 0)
583 avio_free_directory_entry(next);
584 return ret;
585 }
586
avio_close_dir(AVIODirContext ** s)587 int avio_close_dir(AVIODirContext **s)
588 {
589 URLContext *h;
590
591 av_assert0(s);
592 if (!(*s) || !(*s)->url_context)
593 return AVERROR(EINVAL);
594 h = (*s)->url_context;
595 h->prot->url_close_dir(h);
596 ffurl_close(h);
597 av_freep(s);
598 *s = NULL;
599 return 0;
600 }
601
avio_free_directory_entry(AVIODirEntry ** entry)602 void avio_free_directory_entry(AVIODirEntry **entry)
603 {
604 if (!entry || !*entry)
605 return;
606 av_free((*entry)->name);
607 av_freep(entry);
608 }
609
ffurl_size(URLContext * h)610 int64_t ffurl_size(URLContext *h)
611 {
612 int64_t pos, size;
613
614 size = ffurl_seek(h, 0, AVSEEK_SIZE);
615 if (size < 0) {
616 pos = ffurl_seek(h, 0, SEEK_CUR);
617 if ((size = ffurl_seek(h, -1, SEEK_END)) < 0)
618 return size;
619 size++;
620 ffurl_seek(h, pos, SEEK_SET);
621 }
622 return size;
623 }
624
ffurl_get_file_handle(URLContext * h)625 int ffurl_get_file_handle(URLContext *h)
626 {
627 if (!h || !h->prot || !h->prot->url_get_file_handle)
628 return -1;
629 return h->prot->url_get_file_handle(h);
630 }
631
ffurl_get_multi_file_handle(URLContext * h,int ** handles,int * numhandles)632 int ffurl_get_multi_file_handle(URLContext *h, int **handles, int *numhandles)
633 {
634 if (!h || !h->prot)
635 return AVERROR(ENOSYS);
636 if (!h->prot->url_get_multi_file_handle) {
637 if (!h->prot->url_get_file_handle)
638 return AVERROR(ENOSYS);
639 *handles = av_malloc(sizeof(**handles));
640 if (!*handles)
641 return AVERROR(ENOMEM);
642 *numhandles = 1;
643 *handles[0] = h->prot->url_get_file_handle(h);
644 return 0;
645 }
646 return h->prot->url_get_multi_file_handle(h, handles, numhandles);
647 }
648
ffurl_get_short_seek(URLContext * h)649 int ffurl_get_short_seek(URLContext *h)
650 {
651 if (!h || !h->prot || !h->prot->url_get_short_seek)
652 return AVERROR(ENOSYS);
653 return h->prot->url_get_short_seek(h);
654 }
655
ffurl_shutdown(URLContext * h,int flags)656 int ffurl_shutdown(URLContext *h, int flags)
657 {
658 if (!h || !h->prot || !h->prot->url_shutdown)
659 return AVERROR(ENOSYS);
660 return h->prot->url_shutdown(h, flags);
661 }
662
ff_check_interrupt(AVIOInterruptCB * cb)663 int ff_check_interrupt(AVIOInterruptCB *cb)
664 {
665 if (cb && cb->callback)
666 return cb->callback(cb->opaque);
667 return 0;
668 }
669
ff_rename(const char * url_src,const char * url_dst,void * logctx)670 int ff_rename(const char *url_src, const char *url_dst, void *logctx)
671 {
672 int ret = avpriv_io_move(url_src, url_dst);
673 if (ret < 0)
674 av_log(logctx, AV_LOG_ERROR, "failed to rename file %s to %s: %s\n", url_src, url_dst, av_err2str(ret));
675 return ret;
676 }
677