1bc7cf951a1d58c95815c7beb79500f73d9b813f
[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/stat.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(errno);
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, const 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 if (whence == AVSEEK_SIZE) {
77 struct stat st;
78 int ret = fstat(fd, &st);
79 return ret < 0 ? AVERROR(errno) : st.st_size;
80 }
81 return lseek(fd, pos, whence);
82 }
83
84 static int file_close(URLContext *h)
85 {
86 int fd = (intptr_t) h->priv_data;
87 return close(fd);
88 }
89
90 static int file_get_handle(URLContext *h)
91 {
92 return (intptr_t) h->priv_data;
93 }
94
95 URLProtocol file_protocol = {
96 "file",
97 file_open,
98 file_read,
99 file_write,
100 file_seek,
101 file_close,
102 .url_get_file_handle = file_get_handle,
103 };
104
105 /* pipe protocol */
106
107 static int pipe_open(URLContext *h, const char *filename, int flags)
108 {
109 int fd;
110 char *final;
111 av_strstart(filename, "pipe:", &filename);
112
113 fd = strtol(filename, &final, 10);
114 if((filename == final) || *final ) {/* No digits found, or something like 10ab */
115 if (flags & URL_WRONLY) {
116 fd = 1;
117 } else {
118 fd = 0;
119 }
120 }
121 #if HAVE_SETMODE
122 setmode(fd, O_BINARY);
123 #endif
124 h->priv_data = (void *) (intptr_t) fd;
125 h->is_streamed = 1;
126 return 0;
127 }
128
129 URLProtocol pipe_protocol = {
130 "pipe",
131 pipe_open,
132 file_read,
133 file_write,
134 .url_get_file_handle = file_get_handle,
135 };