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libavformat/file.c

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00001 /*
00002  * buffered file I/O
00003  * Copyright (c) 2001 Fabrice Bellard
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 #include "libavutil/avstring.h"
00023 #include "avformat.h"
00024 #include <fcntl.h>
00025 #if HAVE_SETMODE
00026 #include <io.h>
00027 #endif
00028 #include <unistd.h>
00029 #include <sys/stat.h>
00030 #include <stdlib.h>
00031 #include "os_support.h"
00032 #include "url.h"
00033 
00034 
00035 /* standard file protocol */
00036 
00037 static int file_read(URLContext *h, unsigned char *buf, int size)
00038 {
00039     int fd = (intptr_t) h->priv_data;
00040     int r = read(fd, buf, size);
00041     return (-1 == r)?AVERROR(errno):r;
00042 }
00043 
00044 static int file_write(URLContext *h, const unsigned char *buf, int size)
00045 {
00046     int fd = (intptr_t) h->priv_data;
00047     int r = write(fd, buf, size);
00048     return (-1 == r)?AVERROR(errno):r;
00049 }
00050 
00051 static int file_get_handle(URLContext *h)
00052 {
00053     return (intptr_t) h->priv_data;
00054 }
00055 
00056 static int file_check(URLContext *h, int mask)
00057 {
00058     struct stat st;
00059     int ret = stat(h->filename, &st);
00060     if (ret < 0)
00061         return AVERROR(errno);
00062 
00063     ret |= st.st_mode&S_IRUSR ? mask&AVIO_FLAG_READ  : 0;
00064     ret |= st.st_mode&S_IWUSR ? mask&AVIO_FLAG_WRITE : 0;
00065 
00066     return ret;
00067 }
00068 
00069 #if CONFIG_FILE_PROTOCOL
00070 
00071 static int file_open(URLContext *h, const char *filename, int flags)
00072 {
00073     int access;
00074     int fd;
00075 
00076     av_strstart(filename, "file:", &filename);
00077 
00078     if (flags & AVIO_FLAG_WRITE && flags & AVIO_FLAG_READ) {
00079         access = O_CREAT | O_TRUNC | O_RDWR;
00080     } else if (flags & AVIO_FLAG_WRITE) {
00081         access = O_CREAT | O_TRUNC | O_WRONLY;
00082     } else {
00083         access = O_RDONLY;
00084     }
00085 #ifdef O_BINARY
00086     access |= O_BINARY;
00087 #endif
00088     fd = open(filename, access, 0666);
00089     if (fd == -1)
00090         return AVERROR(errno);
00091     h->priv_data = (void *) (intptr_t) fd;
00092     return 0;
00093 }
00094 
00095 /* XXX: use llseek */
00096 static int64_t file_seek(URLContext *h, int64_t pos, int whence)
00097 {
00098     int fd = (intptr_t) h->priv_data;
00099     if (whence == AVSEEK_SIZE) {
00100         struct stat st;
00101         int ret = fstat(fd, &st);
00102         return ret < 0 ? AVERROR(errno) : st.st_size;
00103     }
00104     return lseek(fd, pos, whence);
00105 }
00106 
00107 static int file_close(URLContext *h)
00108 {
00109     int fd = (intptr_t) h->priv_data;
00110     return close(fd);
00111 }
00112 
00113 URLProtocol ff_file_protocol = {
00114     .name                = "file",
00115     .url_open            = file_open,
00116     .url_read            = file_read,
00117     .url_write           = file_write,
00118     .url_seek            = file_seek,
00119     .url_close           = file_close,
00120     .url_get_file_handle = file_get_handle,
00121     .url_check           = file_check,
00122 };
00123 
00124 #endif /* CONFIG_FILE_PROTOCOL */
00125 
00126 #if CONFIG_PIPE_PROTOCOL
00127 
00128 static int pipe_open(URLContext *h, const char *filename, int flags)
00129 {
00130     int fd;
00131     char *final;
00132     av_strstart(filename, "pipe:", &filename);
00133 
00134     fd = strtol(filename, &final, 10);
00135     if((filename == final) || *final ) {/* No digits found, or something like 10ab */
00136         if (flags & AVIO_FLAG_WRITE) {
00137             fd = 1;
00138         } else {
00139             fd = 0;
00140         }
00141     }
00142 #if HAVE_SETMODE
00143     setmode(fd, O_BINARY);
00144 #endif
00145     h->priv_data = (void *) (intptr_t) fd;
00146     h->is_streamed = 1;
00147     return 0;
00148 }
00149 
00150 URLProtocol ff_pipe_protocol = {
00151     .name                = "pipe",
00152     .url_open            = pipe_open,
00153     .url_read            = file_read,
00154     .url_write           = file_write,
00155     .url_get_file_handle = file_get_handle,
00156     .url_check           = file_check,
00157 };
00158 
00159 #endif /* CONFIG_PIPE_PROTOCOL */
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