misc spelling fixes
[libav.git] / libavformat / avio.c
CommitLineData
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1/*
2 * Unbuffered io for ffmpeg system
19720f15 3 * Copyright (c) 2001 Fabrice Bellard
de6d9b64 4 *
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5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
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8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
b78e7197 10 * version 2.1 of the License, or (at your option) any later version.
de6d9b64 11 *
b78e7197 12 * FFmpeg is distributed in the hope that it will be useful,
de6d9b64 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
de6d9b64 16 *
19720f15 17 * You should have received a copy of the GNU Lesser General Public
b78e7197 18 * License along with FFmpeg; if not, write to the Free Software
5509bffa 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
de6d9b64 20 */
de6d9b64 21#include "avformat.h"
75e61b0e 22#include "avstring.h"
de6d9b64 23
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24static int default_interrupt_cb(void);
25
de6d9b64 26URLProtocol *first_protocol = NULL;
019ac05a 27URLInterruptCB *url_interrupt_cb = default_interrupt_cb;
de6d9b64 28
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29URLProtocol *av_protocol_next(URLProtocol *p)
30{
31 if(p) return p->next;
32 else return first_protocol;
33}
34
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35int register_protocol(URLProtocol *protocol)
36{
37 URLProtocol **p;
38 p = &first_protocol;
39 while (*p != NULL) p = &(*p)->next;
40 *p = protocol;
41 protocol->next = NULL;
42 return 0;
43}
44
45int url_open(URLContext **puc, const char *filename, int flags)
46{
47 URLContext *uc;
48 URLProtocol *up;
49 const char *p;
50 char proto_str[128], *q;
51 int err;
52
53 p = filename;
54 q = proto_str;
55 while (*p != '\0' && *p != ':') {
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56 /* protocols can only contain alphabetic chars */
57 if (!isalpha(*p))
58 goto file_proto;
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59 if ((q - proto_str) < sizeof(proto_str) - 1)
60 *q++ = *p;
61 p++;
62 }
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63 /* if the protocol has length 1, we consider it is a dos drive */
64 if (*p == '\0' || (q - proto_str) <= 1) {
5d5fef0a 65 file_proto:
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66 strcpy(proto_str, "file");
67 } else {
68 *q = '\0';
69 }
115329f1 70
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71 up = first_protocol;
72 while (up != NULL) {
a74127c0 73 if (!strcmp(proto_str, up->name))
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74 goto found;
75 up = up->next;
76 }
8fa36ae0 77 err = AVERROR(ENOENT);
8a9488b5 78 goto fail;
de6d9b64 79 found:
62181004 80 uc = av_malloc(sizeof(URLContext) + strlen(filename) + 1);
8a9488b5 81 if (!uc) {
8fa36ae0 82 err = AVERROR(ENOMEM);
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83 goto fail;
84 }
62181004 85 uc->filename = (char *) &uc[1];
f746a046 86 strcpy(uc->filename, filename);
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87 uc->prot = up;
88 uc->flags = flags;
89 uc->is_streamed = 0; /* default = not streamed */
8a9488b5 90 uc->max_packet_size = 0; /* default: stream file */
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91 err = up->url_open(uc, filename, flags);
92 if (err < 0) {
1ea4f593 93 av_free(uc);
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94 *puc = NULL;
95 return err;
96 }
97 *puc = uc;
98 return 0;
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99 fail:
100 *puc = NULL;
101 return err;
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102}
103
104int url_read(URLContext *h, unsigned char *buf, int size)
105{
106 int ret;
107 if (h->flags & URL_WRONLY)
6f3e0b21 108 return AVERROR(EIO);
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109 ret = h->prot->url_read(h, buf, size);
110 return ret;
111}
112
113int url_write(URLContext *h, unsigned char *buf, int size)
114{
115 int ret;
8a9488b5 116 if (!(h->flags & (URL_WRONLY | URL_RDWR)))
6f3e0b21 117 return AVERROR(EIO);
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118 /* avoid sending too big packets */
119 if (h->max_packet_size && size > h->max_packet_size)
6f3e0b21 120 return AVERROR(EIO);
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121 ret = h->prot->url_write(h, buf, size);
122 return ret;
123}
124
125offset_t url_seek(URLContext *h, offset_t pos, int whence)
126{
127 offset_t ret;
128
129 if (!h->prot->url_seek)
8fa36ae0 130 return AVERROR(EPIPE);
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131 ret = h->prot->url_seek(h, pos, whence);
132 return ret;
133}
134
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135int url_close(URLContext *h)
136{
7a813b36 137 int ret = 0;
346db900 138 if (!h) return 0; /* can happen when url_open fails */
de6d9b64 139
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140 if (h->prot->url_close)
141 ret = h->prot->url_close(h);
1ea4f593 142 av_free(h);
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143 return ret;
144}
145
146int url_exist(const char *filename)
147{
148 URLContext *h;
149 if (url_open(&h, filename, URL_RDONLY) < 0)
150 return 0;
151 url_close(h);
152 return 1;
153}
154
155offset_t url_filesize(URLContext *h)
156{
157 offset_t pos, size;
115329f1 158
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159 size= url_seek(h, 0, AVSEEK_SIZE);
160 if(size<0){
1ae2c5f2 161 pos = url_seek(h, 0, SEEK_CUR);
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162 if ((size = url_seek(h, -1, SEEK_END)) < 0)
163 return size;
164 size++;
1ae2c5f2 165 url_seek(h, pos, SEEK_SET);
8e287af0 166 }
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167 return size;
168}
8a9488b5 169
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170int url_get_max_packet_size(URLContext *h)
171{
172 return h->max_packet_size;
173}
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174
175void url_get_filename(URLContext *h, char *buf, int buf_size)
176{
75e61b0e 177 av_strlcpy(buf, h->filename, buf_size);
f746a046 178}
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179
180
181static int default_interrupt_cb(void)
182{
183 return 0;
184}
185
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186void url_set_interrupt_cb(URLInterruptCB *interrupt_cb)
187{
188 if (!interrupt_cb)
189 interrupt_cb = default_interrupt_cb;
190 url_interrupt_cb = interrupt_cb;
191}
536333a0 192
502bdf68 193int av_url_read_pause(URLContext *h, int pause)
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194{
195 if (!h->prot->url_read_pause)
196 return AVERROR(ENOSYS);
502bdf68 197 return h->prot->url_read_pause(h, pause);
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198}
199
b075e520 200offset_t av_url_read_seek(URLContext *h,
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201 int stream_index, int64_t timestamp, int flags)
202{
203 if (!h->prot->url_read_seek)
204 return AVERROR(ENOSYS);
205 return h->prot->url_read_seek(h, stream_index, timestamp, flags);
206}