3 * Copyright (c) 2001 Fabrice Bellard
5 * This file is part of Libav.
7 * Libav 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.
12 * Libav 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.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #include "libavutil/avstring.h"
25 #include "libavutil/dict.h"
26 #include "libavutil/opt.h"
27 #include "os_support.h"
34 static URLProtocol *first_protocol = NULL;
36 URLProtocol *ffurl_protocol_next(URLProtocol *prev)
38 return prev ? prev->next : first_protocol;
41 /** @name Logging context. */
43 static const char *urlcontext_to_name(void *ptr)
45 URLContext *h = (URLContext *)ptr;
46 if(h->prot) return h->prot->name;
50 static void *urlcontext_child_next(void *obj, void *prev)
53 if (!prev && h->priv_data && h->prot->priv_data_class)
58 static const AVClass *urlcontext_child_class_next(const AVClass *prev)
60 URLProtocol *p = NULL;
62 /* find the protocol that corresponds to prev */
63 while (prev && (p = ffurl_protocol_next(p)))
64 if (p->priv_data_class == prev)
67 /* find next protocol with priv options */
68 while (p = ffurl_protocol_next(p))
69 if (p->priv_data_class)
70 return p->priv_data_class;
75 static const AVOption options[] = {{NULL}};
76 const AVClass ffurl_context_class = {
77 .class_name = "URLContext",
78 .item_name = urlcontext_to_name,
80 .version = LIBAVUTIL_VERSION_INT,
81 .child_next = urlcontext_child_next,
82 .child_class_next = urlcontext_child_class_next,
87 #if FF_API_OLD_INTERRUPT_CB
88 static int default_interrupt_cb(void);
89 int (*url_interrupt_cb)(void) = default_interrupt_cb;
92 const char *avio_enum_protocols(void **opaque, int output)
94 URLProtocol **p = opaque;
95 *p = ffurl_protocol_next(*p);
97 if ((output && (*p)->url_write) || (!output && (*p)->url_read))
99 return avio_enum_protocols(opaque, output);
102 int ffurl_register_protocol(URLProtocol *protocol, int size)
105 if (size < sizeof(URLProtocol)) {
106 URLProtocol* temp = av_mallocz(sizeof(URLProtocol));
107 memcpy(temp, protocol, size);
111 while (*p != NULL) p = &(*p)->next;
113 protocol->next = NULL;
117 static int url_alloc_for_protocol (URLContext **puc, struct URLProtocol *up,
118 const char *filename, int flags,
119 const AVIOInterruptCB *int_cb)
125 if (up->flags & URL_PROTOCOL_FLAG_NETWORK && !ff_network_init())
128 uc = av_mallocz(sizeof(URLContext) + strlen(filename) + 1);
130 err = AVERROR(ENOMEM);
133 uc->av_class = &ffurl_context_class;
134 uc->filename = (char *) &uc[1];
135 strcpy(uc->filename, filename);
138 uc->is_streamed = 0; /* default = not streamed */
139 uc->max_packet_size = 0; /* default: stream file */
140 if (up->priv_data_size) {
141 uc->priv_data = av_mallocz(up->priv_data_size);
142 if (up->priv_data_class) {
143 *(const AVClass**)uc->priv_data = up->priv_data_class;
144 av_opt_set_defaults(uc->priv_data);
148 uc->interrupt_callback = *int_cb;
155 if (up->flags & URL_PROTOCOL_FLAG_NETWORK)
161 int ffurl_connect(URLContext* uc, AVDictionary **options)
164 uc->prot->url_open2 ? uc->prot->url_open2(uc, uc->filename, uc->flags, options) :
165 uc->prot->url_open(uc, uc->filename, uc->flags);
168 uc->is_connected = 1;
169 //We must be careful here as ffurl_seek() could be slow, for example for http
170 if( (uc->flags & AVIO_FLAG_WRITE)
171 || !strcmp(uc->prot->name, "file"))
172 if(!uc->is_streamed && ffurl_seek(uc, 0, SEEK_SET) < 0)
177 #define URL_SCHEME_CHARS \
178 "abcdefghijklmnopqrstuvwxyz" \
179 "ABCDEFGHIJKLMNOPQRSTUVWXYZ" \
182 int ffurl_alloc(URLContext **puc, const char *filename, int flags,
183 const AVIOInterruptCB *int_cb)
185 URLProtocol *up = NULL;
186 char proto_str[128], proto_nested[128], *ptr;
187 size_t proto_len = strspn(filename, URL_SCHEME_CHARS);
189 if (filename[proto_len] != ':' || is_dos_path(filename))
190 strcpy(proto_str, "file");
192 av_strlcpy(proto_str, filename, FFMIN(proto_len+1, sizeof(proto_str)));
194 av_strlcpy(proto_nested, proto_str, sizeof(proto_nested));
195 if ((ptr = strchr(proto_nested, '+')))
198 while (up = ffurl_protocol_next(up)) {
199 if (!strcmp(proto_str, up->name))
200 return url_alloc_for_protocol (puc, up, filename, flags, int_cb);
201 if (up->flags & URL_PROTOCOL_FLAG_NESTED_SCHEME &&
202 !strcmp(proto_nested, up->name))
203 return url_alloc_for_protocol (puc, up, filename, flags, int_cb);
206 return AVERROR(ENOENT);
209 int ffurl_open(URLContext **puc, const char *filename, int flags,
210 const AVIOInterruptCB *int_cb, AVDictionary **options)
212 int ret = ffurl_alloc(puc, filename, flags, int_cb);
215 if (options && (*puc)->prot->priv_data_class &&
216 (ret = av_opt_set_dict((*puc)->priv_data, options)) < 0)
218 ret = ffurl_connect(*puc, options);
227 static inline int retry_transfer_wrapper(URLContext *h, unsigned char *buf, int size, int size_min,
228 int (*transfer_func)(URLContext *h, unsigned char *buf, int size))
231 int fast_retries = 5;
234 while (len < size_min) {
235 ret = transfer_func(h, buf+len, size-len);
236 if (ret == AVERROR(EINTR))
238 if (h->flags & AVIO_FLAG_NONBLOCK)
240 if (ret == AVERROR(EAGAIN)) {
247 return ret < 0 ? ret : len;
249 fast_retries = FFMAX(fast_retries, 2);
251 if (ff_check_interrupt(&h->interrupt_callback))
257 int ffurl_read(URLContext *h, unsigned char *buf, int size)
259 if (!(h->flags & AVIO_FLAG_READ))
261 return retry_transfer_wrapper(h, buf, size, 1, h->prot->url_read);
264 int ffurl_read_complete(URLContext *h, unsigned char *buf, int size)
266 if (!(h->flags & AVIO_FLAG_READ))
268 return retry_transfer_wrapper(h, buf, size, size, h->prot->url_read);
271 int ffurl_write(URLContext *h, const unsigned char *buf, int size)
273 if (!(h->flags & AVIO_FLAG_WRITE))
275 /* avoid sending too big packets */
276 if (h->max_packet_size && size > h->max_packet_size)
279 return retry_transfer_wrapper(h, buf, size, size, h->prot->url_write);
282 int64_t ffurl_seek(URLContext *h, int64_t pos, int whence)
286 if (!h->prot->url_seek)
287 return AVERROR(ENOSYS);
288 ret = h->prot->url_seek(h, pos, whence & ~AVSEEK_FORCE);
292 int ffurl_close(URLContext *h)
295 if (!h) return 0; /* can happen when ffurl_open fails */
297 if (h->is_connected && h->prot->url_close)
298 ret = h->prot->url_close(h);
300 if (h->prot->flags & URL_PROTOCOL_FLAG_NETWORK)
303 if (h->prot->priv_data_size) {
304 if (h->prot->priv_data_class)
305 av_opt_free(h->priv_data);
306 av_free(h->priv_data);
312 int avio_check(const char *url, int flags)
315 int ret = ffurl_alloc(&h, url, flags, NULL);
319 if (h->prot->url_check) {
320 ret = h->prot->url_check(h, flags);
322 ret = ffurl_connect(h, NULL);
331 int64_t ffurl_size(URLContext *h)
335 size= ffurl_seek(h, 0, AVSEEK_SIZE);
337 pos = ffurl_seek(h, 0, SEEK_CUR);
338 if ((size = ffurl_seek(h, -1, SEEK_END)) < 0)
341 ffurl_seek(h, pos, SEEK_SET);
346 int ffurl_get_file_handle(URLContext *h)
348 if (!h->prot->url_get_file_handle)
350 return h->prot->url_get_file_handle(h);
353 #if FF_API_OLD_INTERRUPT_CB
354 static int default_interrupt_cb(void)
359 void avio_set_interrupt_cb(int (*interrupt_cb)(void))
362 interrupt_cb = default_interrupt_cb;
363 url_interrupt_cb = interrupt_cb;
367 int ff_check_interrupt(AVIOInterruptCB *cb)
370 if (cb && cb->callback && (ret = cb->callback(cb->opaque)))
372 #if FF_API_OLD_INTERRUPT_CB
373 return url_interrupt_cb();