d2cb5302d490feea8130623917d871c3c48480c2
[libav.git] / libavformat / file.c
1 /*
2 * Buffered file io for ffmpeg system
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 "avformat.h"
24 #include <fcntl.h>
25 #if HAVE_SETMODE
26 #include <io.h>
27 #endif
28 #include <unistd.h>
29 #include <sys/time.h>
30 #include <stdlib.h>
31 #include "os_support.h"
32
33
34 /* standard file protocol */
35
36 static int file_open(URLContext *h, const char *filename, int flags)
37 {
38 int access;
39 int fd;
40
41 av_strstart(filename, "file:", &filename);
42
43 if (flags & URL_RDWR) {
44 access = O_CREAT | O_TRUNC | O_RDWR;
45 } else if (flags & URL_WRONLY) {
46 access = O_CREAT | O_TRUNC | O_WRONLY;
47 } else {
48 access = O_RDONLY;
49 }
50 #ifdef O_BINARY
51 access |= O_BINARY;
52 #endif
53 fd = open(filename, access, 0666);
54 if (fd == -1)
55 return AVERROR(ENOENT);
56 h->priv_data = (void *) (intptr_t) fd;
57 return 0;
58 }
59
60 static int file_read(URLContext *h, unsigned char *buf, int size)
61 {
62 int fd = (intptr_t) h->priv_data;
63 return read(fd, buf, size);
64 }
65
66 static int file_write(URLContext *h, unsigned char *buf, int size)
67 {
68 int fd = (intptr_t) h->priv_data;
69 return write(fd, buf, size);
70 }
71
72 /* XXX: use llseek */
73 static int64_t file_seek(URLContext *h, int64_t pos, int whence)
74 {
75 int fd = (intptr_t) h->priv_data;
76 return lseek(fd, pos, whence);
77 }
78
79 static int file_close(URLContext *h)
80 {
81 int fd = (intptr_t) h->priv_data;
82 return close(fd);
83 }
84
85 static int file_get_handle(URLContext *h)
86 {
87 return (intptr_t) h->priv_data;
88 }
89
90 URLProtocol file_protocol = {
91 "file",
92 file_open,
93 file_read,
94 file_write,
95 file_seek,
96 file_close,
97 .url_get_file_handle = file_get_handle,
98 };
99
100 /* pipe protocol */
101
102 static int pipe_open(URLContext *h, const char *filename, int flags)
103 {
104 int fd;
105 char *final;
106 av_strstart(filename, "pipe:", &filename);
107
108 fd = strtol(filename, &final, 10);
109 if((filename == final) || *final ) {/* No digits found, or something like 10ab */
110 if (flags & URL_WRONLY) {
111 fd = 1;
112 } else {
113 fd = 0;
114 }
115 }
116 #if HAVE_SETMODE
117 setmode(fd, O_BINARY);
118 #endif
119 h->priv_data = (void *) (intptr_t) fd;
120 h->is_streamed = 1;
121 return 0;
122 }
123
124 URLProtocol pipe_protocol = {
125 "pipe",
126 pipe_open,
127 file_read,
128 file_write,
129 .url_get_file_handle = file_get_handle,
130 };