db671698f7527707357580498b554eb99c009e4b
[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 #include "avformat.h"
22 #include <fcntl.h>
23 #ifndef __MINGW32__
24 #include <unistd.h>
25 #include <sys/ioctl.h>
26 #include <sys/time.h>
27 #else
28 #include <io.h>
29 #define open(fname,oflag,pmode) _open(fname,oflag,pmode)
30 #endif /* __MINGW32__ */
31
32
33 /* standard file protocol */
34
35 static int file_open(URLContext *h, const char *filename, int flags)
36 {
37 int access;
38 int fd;
39
40 strstart(filename, "file:", &filename);
41
42 if (flags & URL_RDWR) {
43 access = O_CREAT | O_TRUNC | O_RDWR;
44 } else if (flags & URL_WRONLY) {
45 access = O_CREAT | O_TRUNC | O_WRONLY;
46 } else {
47 access = O_RDONLY;
48 }
49 #if defined(__MINGW32__) || defined(CONFIG_OS2) || defined(__CYGWIN__)
50 access |= O_BINARY;
51 #endif
52 fd = open(filename, access, 0666);
53 if (fd < 0)
54 return -ENOENT;
55 h->priv_data = (void *)(size_t)fd;
56 return 0;
57 }
58
59 static int file_read(URLContext *h, unsigned char *buf, int size)
60 {
61 int fd = (size_t)h->priv_data;
62 return read(fd, buf, size);
63 }
64
65 static int file_write(URLContext *h, unsigned char *buf, int size)
66 {
67 int fd = (size_t)h->priv_data;
68 return write(fd, buf, size);
69 }
70
71 /* XXX: use llseek */
72 static offset_t file_seek(URLContext *h, offset_t pos, int whence)
73 {
74 int fd = (size_t)h->priv_data;
75 #if defined(__MINGW32__)
76 return _lseeki64(fd, pos, whence);
77 #else
78 return lseek(fd, pos, whence);
79 #endif
80 }
81
82 static int file_close(URLContext *h)
83 {
84 int fd = (size_t)h->priv_data;
85 return close(fd);
86 }
87
88 URLProtocol file_protocol = {
89 "file",
90 file_open,
91 file_read,
92 file_write,
93 file_seek,
94 file_close,
95 };
96
97 /* pipe protocol */
98
99 static int pipe_open(URLContext *h, const char *filename, int flags)
100 {
101 int fd;
102
103 if (flags & URL_WRONLY) {
104 fd = 1;
105 } else {
106 fd = 0;
107 }
108 #if defined(__MINGW32__) || defined(CONFIG_OS2) || defined(__CYGWIN__)
109 setmode(fd, O_BINARY);
110 #endif
111 h->priv_data = (void *)(size_t)fd;
112 h->is_streamed = 1;
113 return 0;
114 }
115
116 static int pipe_read(URLContext *h, unsigned char *buf, int size)
117 {
118 int fd = (size_t)h->priv_data;
119 return read(fd, buf, size);
120 }
121
122 static int pipe_write(URLContext *h, unsigned char *buf, int size)
123 {
124 int fd = (size_t)h->priv_data;
125 return write(fd, buf, size);
126 }
127
128 static int pipe_close(URLContext *h)
129 {
130 return 0;
131 }
132
133 URLProtocol pipe_protocol = {
134 "pipe",
135 pipe_open,
136 pipe_read,
137 pipe_write,
138 NULL,
139 pipe_close,
140 };