Do not call lseek() with invalid whence value
[libav.git] / libavformat / file.c
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1/*
2 * Buffered file 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 */
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21
22#include "libavutil/avstring.h"
8be1c656 23#include "avformat.h"
de6d9b64 24#include <fcntl.h>
b250f9c6 25#if HAVE_SETMODE
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26#include <io.h>
27#endif
8be1c656 28#include <unistd.h>
de6d9b64 29#include <sys/time.h>
9e33b10f 30#include <stdlib.h>
a5e979f4 31#include "os_support.h"
de6d9b64 32
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33
34/* standard file protocol */
35
36static int file_open(URLContext *h, const char *filename, int flags)
37{
38 int access;
39 int fd;
40
f7d78f36 41 av_strstart(filename, "file:", &filename);
a1dfc201 42
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43 if (flags & URL_RDWR) {
44 access = O_CREAT | O_TRUNC | O_RDWR;
45 } else if (flags & URL_WRONLY) {
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46 access = O_CREAT | O_TRUNC | O_WRONLY;
47 } else {
48 access = O_RDONLY;
49 }
05d00e95 50#ifdef O_BINARY
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51 access |= O_BINARY;
52#endif
de6d9b64 53 fd = open(filename, access, 0666);
fbf7e805 54 if (fd == -1)
8fa36ae0 55 return AVERROR(ENOENT);
d4efacff 56 h->priv_data = (void *) (intptr_t) fd;
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57 return 0;
58}
59
60static int file_read(URLContext *h, unsigned char *buf, int size)
61{
d4efacff 62 int fd = (intptr_t) h->priv_data;
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63 return read(fd, buf, size);
64}
65
66static int file_write(URLContext *h, unsigned char *buf, int size)
67{
d4efacff 68 int fd = (intptr_t) h->priv_data;
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69 return write(fd, buf, size);
70}
71
72/* XXX: use llseek */
bc5c918e 73static int64_t file_seek(URLContext *h, int64_t pos, int whence)
de6d9b64 74{
d4efacff 75 int fd = (intptr_t) h->priv_data;
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76 if (whence != SEEK_SET && whence != SEEK_CUR && whence != SEEK_END)
77 return AVERROR_NOTSUPP;
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78 return lseek(fd, pos, whence);
79}
80
81static int file_close(URLContext *h)
82{
d4efacff 83 int fd = (intptr_t) h->priv_data;
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84 return close(fd);
85}
86
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87static int file_get_handle(URLContext *h)
88{
d4efacff 89 return (intptr_t) h->priv_data;
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90}
91
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92URLProtocol file_protocol = {
93 "file",
94 file_open,
95 file_read,
96 file_write,
97 file_seek,
98 file_close,
f0a80394 99 .url_get_file_handle = file_get_handle,
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100};
101
102/* pipe protocol */
103
104static int pipe_open(URLContext *h, const char *filename, int flags)
105{
106 int fd;
fbcb0811 107 char *final;
9e33b10f 108 av_strstart(filename, "pipe:", &filename);
de6d9b64 109
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110 fd = strtol(filename, &final, 10);
111 if((filename == final) || *final ) {/* No digits found, or something like 10ab */
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112 if (flags & URL_WRONLY) {
113 fd = 1;
114 } else {
115 fd = 0;
116 }
9e33b10f 117 }
b250f9c6 118#if HAVE_SETMODE
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119 setmode(fd, O_BINARY);
120#endif
d4efacff 121 h->priv_data = (void *) (intptr_t) fd;
f9a35124 122 h->is_streamed = 1;
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123 return 0;
124}
125
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126URLProtocol pipe_protocol = {
127 "pipe",
128 pipe_open,
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129 file_read,
130 file_write,
f0a80394 131 .url_get_file_handle = file_get_handle,
de6d9b64 132};