Libav 0.7.1
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00001 /* 00002 * Buffered file io for ffmpeg system 00003 * Copyright (c) 2001 Fabrice Bellard 00004 * 00005 * This file is part of Libav. 00006 * 00007 * Libav 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 * Libav 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 Libav; 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 return read(fd, buf, size); 00041 } 00042 00043 static int file_write(URLContext *h, const unsigned char *buf, int size) 00044 { 00045 int fd = (intptr_t) h->priv_data; 00046 return write(fd, buf, size); 00047 } 00048 00049 static int file_get_handle(URLContext *h) 00050 { 00051 return (intptr_t) h->priv_data; 00052 } 00053 00054 static int file_check(URLContext *h, int mask) 00055 { 00056 struct stat st; 00057 int ret = stat(h->filename, &st); 00058 if (ret < 0) 00059 return AVERROR(errno); 00060 00061 ret |= st.st_mode&S_IRUSR ? mask&AVIO_FLAG_READ : 0; 00062 ret |= st.st_mode&S_IWUSR ? mask&AVIO_FLAG_WRITE : 0; 00063 00064 return ret; 00065 } 00066 00067 #if CONFIG_FILE_PROTOCOL 00068 00069 static int file_open(URLContext *h, const char *filename, int flags) 00070 { 00071 int access; 00072 int fd; 00073 00074 av_strstart(filename, "file:", &filename); 00075 00076 if (flags & AVIO_FLAG_WRITE && flags & AVIO_FLAG_READ) { 00077 access = O_CREAT | O_TRUNC | O_RDWR; 00078 } else if (flags & AVIO_FLAG_WRITE) { 00079 access = O_CREAT | O_TRUNC | O_WRONLY; 00080 } else { 00081 access = O_RDONLY; 00082 } 00083 #ifdef O_BINARY 00084 access |= O_BINARY; 00085 #endif 00086 fd = open(filename, access, 0666); 00087 if (fd == -1) 00088 return AVERROR(errno); 00089 h->priv_data = (void *) (intptr_t) fd; 00090 return 0; 00091 } 00092 00093 /* XXX: use llseek */ 00094 static int64_t file_seek(URLContext *h, int64_t pos, int whence) 00095 { 00096 int fd = (intptr_t) h->priv_data; 00097 if (whence == AVSEEK_SIZE) { 00098 struct stat st; 00099 int ret = fstat(fd, &st); 00100 return ret < 0 ? AVERROR(errno) : st.st_size; 00101 } 00102 return lseek(fd, pos, whence); 00103 } 00104 00105 static int file_close(URLContext *h) 00106 { 00107 int fd = (intptr_t) h->priv_data; 00108 return close(fd); 00109 } 00110 00111 URLProtocol ff_file_protocol = { 00112 .name = "file", 00113 .url_open = file_open, 00114 .url_read = file_read, 00115 .url_write = file_write, 00116 .url_seek = file_seek, 00117 .url_close = file_close, 00118 .url_get_file_handle = file_get_handle, 00119 .url_check = file_check, 00120 }; 00121 00122 #endif /* CONFIG_FILE_PROTOCOL */ 00123 00124 #if CONFIG_PIPE_PROTOCOL 00125 00126 static int pipe_open(URLContext *h, const char *filename, int flags) 00127 { 00128 int fd; 00129 char *final; 00130 av_strstart(filename, "pipe:", &filename); 00131 00132 fd = strtol(filename, &final, 10); 00133 if((filename == final) || *final ) {/* No digits found, or something like 10ab */ 00134 if (flags & AVIO_FLAG_WRITE) { 00135 fd = 1; 00136 } else { 00137 fd = 0; 00138 } 00139 } 00140 #if HAVE_SETMODE 00141 setmode(fd, O_BINARY); 00142 #endif 00143 h->priv_data = (void *) (intptr_t) fd; 00144 h->is_streamed = 1; 00145 return 0; 00146 } 00147 00148 URLProtocol ff_pipe_protocol = { 00149 .name = "pipe", 00150 .url_open = pipe_open, 00151 .url_read = file_read, 00152 .url_write = file_write, 00153 .url_get_file_handle = file_get_handle, 00154 .url_check = file_check, 00155 }; 00156 00157 #endif /* CONFIG_PIPE_PROTOCOL */