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 int proto_len= strlen(up->name);
118 char *start = strchr(uc->filename, ',');
119 *(const AVClass **)uc->priv_data = up->priv_data_class;
120 av_opt_set_defaults(uc->priv_data);
121 if(!strncmp(up->name, uc->filename, proto_len) && uc->filename + proto_len == start){
122 int ret= 0;
123 char *p= start;
124 char sep= *++p;
125 char *key, *val;
126 p++;
127
128 if (strcmp(up->name, "subfile"))
129 ret = AVERROR(EINVAL);
130
131 while(ret >= 0 && (key= strchr(p, sep)) && p<key && (val = strchr(key+1, sep))){
132 *val= *key= 0;
133 if (strcmp(p, "start") && strcmp(p, "end")) {
134 ret = AVERROR_OPTION_NOT_FOUND;
135 } else
136 ret= av_opt_set(uc->priv_data, p, key+1, 0);
137 if (ret == AVERROR_OPTION_NOT_FOUND)
138 av_log(uc, AV_LOG_ERROR, "Key '%s' not found.\n", p);
139 *val= *key= sep;
140 p= val+1;
141 }
142 if(ret<0 || p!=key){
143 av_log(uc, AV_LOG_ERROR, "Error parsing options string %s\n", start);
144 av_freep(&uc->priv_data);
145 av_freep(&uc);
146 err = AVERROR(EINVAL);
147 goto fail;
148 }
149 memmove(start, key+1, strlen(key));
150 }
151 }
152 }
153 if (int_cb)
154 uc->interrupt_callback = *int_cb;
155
156 *puc = uc;
157 return 0;
158 fail:
159 *puc = NULL;
160 if (uc)
161 av_freep(&uc->priv_data);
162 av_freep(&uc);
163 #if CONFIG_NETWORK
164 if (up->flags & URL_PROTOCOL_FLAG_NETWORK)
165 ff_network_close();
166 #endif
167 return err;
168 }
169
ffurl_connect(URLContext * uc,AVDictionary ** options)170 int ffurl_connect(URLContext *uc, AVDictionary **options)
171 {
172 int err;
173 AVDictionary *tmp_opts = NULL;
174 AVDictionaryEntry *e;
175
176 if (!options)
177 options = &tmp_opts;
178
179 // Check that URLContext was initialized correctly and lists are matching if set
180 av_assert0(!(e=av_dict_get(*options, "protocol_whitelist", NULL, 0)) ||
181 (uc->protocol_whitelist && !strcmp(uc->protocol_whitelist, e->value)));
182 av_assert0(!(e=av_dict_get(*options, "protocol_blacklist", NULL, 0)) ||
183 (uc->protocol_blacklist && !strcmp(uc->protocol_blacklist, e->value)));
184
185 if (uc->protocol_whitelist && av_match_list(uc->prot->name, uc->protocol_whitelist, ',') <= 0) {
186 av_log(uc, AV_LOG_ERROR, "Protocol '%s' not on whitelist '%s'!\n", uc->prot->name, uc->protocol_whitelist);
187 return AVERROR(EINVAL);
188 }
189
190 if (uc->protocol_blacklist && av_match_list(uc->prot->name, uc->protocol_blacklist, ',') > 0) {
191 av_log(uc, AV_LOG_ERROR, "Protocol '%s' on blacklist '%s'!\n", uc->prot->name, uc->protocol_blacklist);
192 return AVERROR(EINVAL);
193 }
194
195 if (!uc->protocol_whitelist && uc->prot->default_whitelist) {
196 av_log(uc, AV_LOG_DEBUG, "Setting default whitelist '%s'\n", uc->prot->default_whitelist);
197 uc->protocol_whitelist = av_strdup(uc->prot->default_whitelist);
198 if (!uc->protocol_whitelist) {
199 return AVERROR(ENOMEM);
200 }
201 } else if (!uc->protocol_whitelist)
202 av_log(uc, AV_LOG_DEBUG, "No default whitelist set\n"); // This should be an error once all declare a default whitelist
203
204 if ((err = av_dict_set(options, "protocol_whitelist", uc->protocol_whitelist, 0)) < 0)
205 return err;
206 if ((err = av_dict_set(options, "protocol_blacklist", uc->protocol_blacklist, 0)) < 0)
207 return err;
208
209 err =
210 uc->prot->url_open2 ? uc->prot->url_open2(uc,
211 uc->filename,
212 uc->flags,
213 options) :
214 uc->prot->url_open(uc, uc->filename, uc->flags);
215
216 av_dict_set(options, "protocol_whitelist", NULL, 0);
217 av_dict_set(options, "protocol_blacklist", NULL, 0);
218
219 if (err)
220 return err;
221 uc->is_connected = 1;
222 /* We must be careful here as ffurl_seek() could be slow,
223 * for example for http */
224 if ((uc->flags & AVIO_FLAG_WRITE) || !strcmp(uc->prot->name, "file"))
225 if (!uc->is_streamed && ffurl_seek(uc, 0, SEEK_SET) < 0)
226 uc->is_streamed = 1;
227 return 0;
228 }
229
ffurl_accept(URLContext * s,URLContext ** c)230 int ffurl_accept(URLContext *s, URLContext **c)
231 {
232 av_assert0(!*c);
233 if (s->prot->url_accept)
234 return s->prot->url_accept(s, c);
235 return AVERROR(EBADF);
236 }
237
ffurl_handshake(URLContext * c)238 int ffurl_handshake(URLContext *c)
239 {
240 int ret;
241 if (c->prot->url_handshake) {
242 ret = c->prot->url_handshake(c);
243 if (ret)
244 return ret;
245 }
246 c->is_connected = 1;
247 return 0;
248 }
249
250 #define URL_SCHEME_CHARS \
251 "abcdefghijklmnopqrstuvwxyz" \
252 "ABCDEFGHIJKLMNOPQRSTUVWXYZ" \
253 "0123456789+-."
254
url_find_protocol(const char * filename)255 static const struct URLProtocol *url_find_protocol(const char *filename)
256 {
257 const URLProtocol **protocols;
258 char proto_str[128], proto_nested[128], *ptr;
259 size_t proto_len = strspn(filename, URL_SCHEME_CHARS);
260 int i;
261
262 if (filename[proto_len] != ':' &&
263 (strncmp(filename, "subfile,", 8) || !strchr(filename + proto_len + 1, ':')) ||
264 is_dos_path(filename))
265 strcpy(proto_str, "file");
266 else
267 av_strlcpy(proto_str, filename,
268 FFMIN(proto_len + 1, sizeof(proto_str)));
269
270 av_strlcpy(proto_nested, proto_str, sizeof(proto_nested));
271 if ((ptr = strchr(proto_nested, '+')))
272 *ptr = '\0';
273
274 protocols = ffurl_get_protocols(NULL, NULL);
275 if (!protocols)
276 return NULL;
277 for (i = 0; protocols[i]; i++) {
278 const URLProtocol *up = protocols[i];
279 if (!strcmp(proto_str, up->name)) {
280 av_freep(&protocols);
281 return up;
282 }
283 if (up->flags & URL_PROTOCOL_FLAG_NESTED_SCHEME &&
284 !strcmp(proto_nested, up->name)) {
285 av_freep(&protocols);
286 return up;
287 }
288 }
289 av_freep(&protocols);
290 if (av_strstart(filename, "https:", NULL) || av_strstart(filename, "tls:", NULL))
291 av_log(NULL, AV_LOG_WARNING, "https protocol not found, recompile FFmpeg with "
292 "openssl, gnutls or securetransport enabled.\n");
293
294 return NULL;
295 }
296
ffurl_alloc(URLContext ** puc,const char * filename,int flags,const AVIOInterruptCB * int_cb)297 int ffurl_alloc(URLContext **puc, const char *filename, int flags,
298 const AVIOInterruptCB *int_cb)
299 {
300 const URLProtocol *p = NULL;
301
302 p = url_find_protocol(filename);
303 if (p)
304 return url_alloc_for_protocol(puc, p, filename, flags, int_cb);
305
306 *puc = NULL;
307 return AVERROR_PROTOCOL_NOT_FOUND;
308 }
309
ffurl_open_whitelist(URLContext ** puc,const char * filename,int flags,const AVIOInterruptCB * int_cb,AVDictionary ** options,const char * whitelist,const char * blacklist,URLContext * parent)310 int ffurl_open_whitelist(URLContext **puc, const char *filename, int flags,
311 const AVIOInterruptCB *int_cb, AVDictionary **options,
312 const char *whitelist, const char* blacklist,
313 URLContext *parent)
314 {
315 AVDictionary *tmp_opts = NULL;
316 AVDictionaryEntry *e;
317 int ret = ffurl_alloc(puc, filename, flags, int_cb);
318 if (ret < 0)
319 return ret;
320 if (parent)
321 av_opt_copy(*puc, parent);
322 if (options &&
323 (ret = av_opt_set_dict(*puc, options)) < 0)
324 goto fail;
325 if (options && (*puc)->prot->priv_data_class &&
326 (ret = av_opt_set_dict((*puc)->priv_data, options)) < 0)
327 goto fail;
328
329 if (!options)
330 options = &tmp_opts;
331
332 av_assert0(!whitelist ||
333 !(e=av_dict_get(*options, "protocol_whitelist", NULL, 0)) ||
334 !strcmp(whitelist, e->value));
335 av_assert0(!blacklist ||
336 !(e=av_dict_get(*options, "protocol_blacklist", NULL, 0)) ||
337 !strcmp(blacklist, e->value));
338
339 if ((ret = av_dict_set(options, "protocol_whitelist", whitelist, 0)) < 0)
340 goto fail;
341
342 if ((ret = av_dict_set(options, "protocol_blacklist", blacklist, 0)) < 0)
343 goto fail;
344
345 if ((ret = av_opt_set_dict(*puc, options)) < 0)
346 goto fail;
347
348 ret = ffurl_connect(*puc, options);
349
350 if (!ret)
351 return 0;
352 fail:
353 ffurl_closep(puc);
354 return ret;
355 }
356
ffurl_open(URLContext ** puc,const char * filename,int flags,const AVIOInterruptCB * int_cb,AVDictionary ** options)357 int ffurl_open(URLContext **puc, const char *filename, int flags,
358 const AVIOInterruptCB *int_cb, AVDictionary **options)
359 {
360 return ffurl_open_whitelist(puc, filename, flags,
361 int_cb, options, NULL, NULL, NULL);
362 }
363
retry_transfer_wrapper(URLContext * h,uint8_t * buf,int size,int size_min,int (* transfer_func)(URLContext * h,uint8_t * buf,int size))364 static inline int retry_transfer_wrapper(URLContext *h, uint8_t *buf,
365 int size, int size_min,
366 int (*transfer_func)(URLContext *h,
367 uint8_t *buf,
368 int size))
369 {
370 int ret, len;
371 int fast_retries = 5;
372 int64_t wait_since = 0;
373
374 len = 0;
375 while (len < size_min) {
376 if (ff_check_interrupt(&h->interrupt_callback))
377 return AVERROR_EXIT;
378 ret = transfer_func(h, buf + len, size - len);
379 if (ret == AVERROR(EINTR))
380 continue;
381 if (h->flags & AVIO_FLAG_NONBLOCK)
382 return ret;
383 if (ret == AVERROR(EAGAIN)) {
384 ret = 0;
385 if (fast_retries) {
386 fast_retries--;
387 } else {
388 if (h->rw_timeout) {
389 if (!wait_since)
390 wait_since = av_gettime_relative();
391 else if (av_gettime_relative() > wait_since + h->rw_timeout)
392 return AVERROR(EIO);
393 }
394 av_usleep(1000);
395 }
396 } else if (ret == AVERROR_EOF)
397 return (len > 0) ? len : AVERROR_EOF;
398 else if (ret < 0)
399 return ret;
400 if (ret) {
401 fast_retries = FFMAX(fast_retries, 2);
402 wait_since = 0;
403 }
404 len += ret;
405 }
406 return len;
407 }
408
ffurl_read(URLContext * h,unsigned char * buf,int size)409 int ffurl_read(URLContext *h, unsigned char *buf, int size)
410 {
411 if (!(h->flags & AVIO_FLAG_READ))
412 return AVERROR(EIO);
413 return retry_transfer_wrapper(h, buf, size, 1, h->prot->url_read);
414 }
415
ffurl_read_complete(URLContext * h,unsigned char * buf,int size)416 int ffurl_read_complete(URLContext *h, unsigned char *buf, int size)
417 {
418 if (!(h->flags & AVIO_FLAG_READ))
419 return AVERROR(EIO);
420 return retry_transfer_wrapper(h, buf, size, size, h->prot->url_read);
421 }
422
ffurl_write(URLContext * h,const unsigned char * buf,int size)423 int ffurl_write(URLContext *h, const unsigned char *buf, int size)
424 {
425 if (!(h->flags & AVIO_FLAG_WRITE))
426 return AVERROR(EIO);
427 /* avoid sending too big packets */
428 if (h->max_packet_size && size > h->max_packet_size)
429 return AVERROR(EIO);
430
431 return retry_transfer_wrapper(h, (unsigned char *)buf, size, size,
432 (int (*)(struct URLContext *, uint8_t *, int))
433 h->prot->url_write);
434 }
435
ffurl_seek(URLContext * h,int64_t pos,int whence)436 int64_t ffurl_seek(URLContext *h, int64_t pos, int whence)
437 {
438 int64_t ret;
439
440 if (!h->prot->url_seek)
441 return AVERROR(ENOSYS);
442 ret = h->prot->url_seek(h, pos, whence & ~AVSEEK_FORCE);
443 return ret;
444 }
445
ffurl_closep(URLContext ** hh)446 int ffurl_closep(URLContext **hh)
447 {
448 URLContext *h= *hh;
449 int ret = 0;
450 if (!h)
451 return 0; /* can happen when ffurl_open fails */
452
453 if (h->is_connected && h->prot->url_close)
454 ret = h->prot->url_close(h);
455 #if CONFIG_NETWORK
456 if (h->prot->flags & URL_PROTOCOL_FLAG_NETWORK)
457 ff_network_close();
458 #endif
459 if (h->prot->priv_data_size) {
460 if (h->prot->priv_data_class)
461 av_opt_free(h->priv_data);
462 av_freep(&h->priv_data);
463 }
464 av_opt_free(h);
465 av_freep(hh);
466 return ret;
467 }
468
ffurl_close(URLContext * h)469 int ffurl_close(URLContext *h)
470 {
471 return ffurl_closep(&h);
472 }
473
474
avio_find_protocol_name(const char * url)475 const char *avio_find_protocol_name(const char *url)
476 {
477 const URLProtocol *p = url_find_protocol(url);
478
479 return p ? p->name : NULL;
480 }
481
avio_check(const char * url,int flags)482 int avio_check(const char *url, int flags)
483 {
484 URLContext *h;
485 int ret = ffurl_alloc(&h, url, flags, NULL);
486 if (ret < 0)
487 return ret;
488
489 if (h->prot->url_check) {
490 ret = h->prot->url_check(h, flags);
491 } else {
492 ret = ffurl_connect(h, NULL);
493 if (ret >= 0)
494 ret = flags;
495 }
496
497 ffurl_close(h);
498 return ret;
499 }
500
avpriv_io_move(const char * url_src,const char * url_dst)501 int avpriv_io_move(const char *url_src, const char *url_dst)
502 {
503 URLContext *h_src, *h_dst;
504 int ret = ffurl_alloc(&h_src, url_src, AVIO_FLAG_READ_WRITE, NULL);
505 if (ret < 0)
506 return ret;
507 ret = ffurl_alloc(&h_dst, url_dst, AVIO_FLAG_WRITE, NULL);
508 if (ret < 0) {
509 ffurl_close(h_src);
510 return ret;
511 }
512
513 if (h_src->prot == h_dst->prot && h_src->prot->url_move)
514 ret = h_src->prot->url_move(h_src, h_dst);
515 else
516 ret = AVERROR(ENOSYS);
517
518 ffurl_close(h_src);
519 ffurl_close(h_dst);
520 return ret;
521 }
522
avpriv_io_delete(const char * url)523 int avpriv_io_delete(const char *url)
524 {
525 URLContext *h;
526 int ret = ffurl_alloc(&h, url, AVIO_FLAG_WRITE, NULL);
527 if (ret < 0)
528 return ret;
529
530 if (h->prot->url_delete)
531 ret = h->prot->url_delete(h);
532 else
533 ret = AVERROR(ENOSYS);
534
535 ffurl_close(h);
536 return ret;
537 }
538
avio_open_dir(AVIODirContext ** s,const char * url,AVDictionary ** options)539 int avio_open_dir(AVIODirContext **s, const char *url, AVDictionary **options)
540 {
541 URLContext *h = NULL;
542 AVIODirContext *ctx = NULL;
543 int ret;
544 av_assert0(s);
545
546 ctx = av_mallocz(sizeof(*ctx));
547 if (!ctx) {
548 ret = AVERROR(ENOMEM);
549 goto fail;
550 }
551
552 if ((ret = ffurl_alloc(&h, url, AVIO_FLAG_READ, NULL)) < 0)
553 goto fail;
554
555 if (h->prot->url_open_dir && h->prot->url_read_dir && h->prot->url_close_dir) {
556 if (options && h->prot->priv_data_class &&
557 (ret = av_opt_set_dict(h->priv_data, options)) < 0)
558 goto fail;
559 ret = h->prot->url_open_dir(h);
560 } else
561 ret = AVERROR(ENOSYS);
562 if (ret < 0)
563 goto fail;
564
565 h->is_connected = 1;
566 ctx->url_context = h;
567 *s = ctx;
568 return 0;
569
570 fail:
571 av_free(ctx);
572 *s = NULL;
573 ffurl_close(h);
574 return ret;
575 }
576
avio_read_dir(AVIODirContext * s,AVIODirEntry ** next)577 int avio_read_dir(AVIODirContext *s, AVIODirEntry **next)
578 {
579 URLContext *h;
580 int ret;
581
582 if (!s || !s->url_context)
583 return AVERROR(EINVAL);
584 h = s->url_context;
585 if ((ret = h->prot->url_read_dir(h, next)) < 0)
586 avio_free_directory_entry(next);
587 return ret;
588 }
589
avio_close_dir(AVIODirContext ** s)590 int avio_close_dir(AVIODirContext **s)
591 {
592 URLContext *h;
593
594 av_assert0(s);
595 if (!(*s) || !(*s)->url_context)
596 return AVERROR(EINVAL);
597 h = (*s)->url_context;
598 h->prot->url_close_dir(h);
599 ffurl_close(h);
600 av_freep(s);
601 *s = NULL;
602 return 0;
603 }
604
avio_free_directory_entry(AVIODirEntry ** entry)605 void avio_free_directory_entry(AVIODirEntry **entry)
606 {
607 if (!entry || !*entry)
608 return;
609 av_free((*entry)->name);
610 av_freep(entry);
611 }
612
ffurl_size(URLContext * h)613 int64_t ffurl_size(URLContext *h)
614 {
615 int64_t pos, size;
616
617 size = ffurl_seek(h, 0, AVSEEK_SIZE);
618 if (size < 0) {
619 pos = ffurl_seek(h, 0, SEEK_CUR);
620 if ((size = ffurl_seek(h, -1, SEEK_END)) < 0)
621 return size;
622 size++;
623 ffurl_seek(h, pos, SEEK_SET);
624 }
625 return size;
626 }
627
ffurl_get_file_handle(URLContext * h)628 int ffurl_get_file_handle(URLContext *h)
629 {
630 if (!h || !h->prot || !h->prot->url_get_file_handle)
631 return -1;
632 return h->prot->url_get_file_handle(h);
633 }
634
ffurl_get_multi_file_handle(URLContext * h,int ** handles,int * numhandles)635 int ffurl_get_multi_file_handle(URLContext *h, int **handles, int *numhandles)
636 {
637 if (!h || !h->prot)
638 return AVERROR(ENOSYS);
639 if (!h->prot->url_get_multi_file_handle) {
640 if (!h->prot->url_get_file_handle)
641 return AVERROR(ENOSYS);
642 *handles = av_malloc(sizeof(**handles));
643 if (!*handles)
644 return AVERROR(ENOMEM);
645 *numhandles = 1;
646 *handles[0] = h->prot->url_get_file_handle(h);
647 return 0;
648 }
649 return h->prot->url_get_multi_file_handle(h, handles, numhandles);
650 }
651
ffurl_get_short_seek(URLContext * h)652 int ffurl_get_short_seek(URLContext *h)
653 {
654 if (!h || !h->prot || !h->prot->url_get_short_seek)
655 return AVERROR(ENOSYS);
656 return h->prot->url_get_short_seek(h);
657 }
658
ffurl_shutdown(URLContext * h,int flags)659 int ffurl_shutdown(URLContext *h, int flags)
660 {
661 if (!h || !h->prot || !h->prot->url_shutdown)
662 return AVERROR(ENOSYS);
663 return h->prot->url_shutdown(h, flags);
664 }
665
ff_check_interrupt(AVIOInterruptCB * cb)666 int ff_check_interrupt(AVIOInterruptCB *cb)
667 {
668 if (cb && cb->callback)
669 return cb->callback(cb->opaque);
670 return 0;
671 }
672
ff_rename(const char * url_src,const char * url_dst,void * logctx)673 int ff_rename(const char *url_src, const char *url_dst, void *logctx)
674 {
675 int ret = avpriv_io_move(url_src, url_dst);
676 if (ret < 0)
677 av_log(logctx, AV_LOG_ERROR, "failed to rename file %s to %s: %s\n", url_src, url_dst, av_err2str(ret));
678 return ret;
679 }
680