| 1 | /* |
| 2 | * buffered file I/O |
| 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 "libavutil/internal.h" |
| 24 | #include "libavutil/opt.h" |
| 25 | #include "avformat.h" |
| 26 | #include <fcntl.h> |
| 27 | #if HAVE_IO_H |
| 28 | #include <io.h> |
| 29 | #endif |
| 30 | #if HAVE_UNISTD_H |
| 31 | #include <unistd.h> |
| 32 | #endif |
| 33 | #include <sys/stat.h> |
| 34 | #include <stdlib.h> |
| 35 | #include "os_support.h" |
| 36 | #include "url.h" |
| 37 | |
| 38 | /* Some systems may not have S_ISFIFO */ |
| 39 | #ifndef S_ISFIFO |
| 40 | # ifdef S_IFIFO |
| 41 | # define S_ISFIFO(m) (((m) & S_IFMT) == S_IFIFO) |
| 42 | # else |
| 43 | # define S_ISFIFO(m) 0 |
| 44 | # endif |
| 45 | #endif |
| 46 | |
| 47 | /* standard file protocol */ |
| 48 | |
| 49 | typedef struct FileContext { |
| 50 | const AVClass *class; |
| 51 | int fd; |
| 52 | int trunc; |
| 53 | int blocksize; |
| 54 | } FileContext; |
| 55 | |
| 56 | static const AVOption file_options[] = { |
| 57 | { "truncate", "truncate existing files on write", offsetof(FileContext, trunc), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, AV_OPT_FLAG_ENCODING_PARAM }, |
| 58 | { "blocksize", "set I/O operation maximum block size", offsetof(FileContext, blocksize), AV_OPT_TYPE_INT, { .i64 = INT_MAX }, 1, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM }, |
| 59 | { NULL } |
| 60 | }; |
| 61 | |
| 62 | static const AVOption pipe_options[] = { |
| 63 | { "blocksize", "set I/O operation maximum block size", offsetof(FileContext, blocksize), AV_OPT_TYPE_INT, { .i64 = INT_MAX }, 1, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM }, |
| 64 | { NULL } |
| 65 | }; |
| 66 | |
| 67 | static const AVClass file_class = { |
| 68 | .class_name = "file", |
| 69 | .item_name = av_default_item_name, |
| 70 | .option = file_options, |
| 71 | .version = LIBAVUTIL_VERSION_INT, |
| 72 | }; |
| 73 | |
| 74 | static const AVClass pipe_class = { |
| 75 | .class_name = "pipe", |
| 76 | .item_name = av_default_item_name, |
| 77 | .option = pipe_options, |
| 78 | .version = LIBAVUTIL_VERSION_INT, |
| 79 | }; |
| 80 | |
| 81 | static int file_read(URLContext *h, unsigned char *buf, int size) |
| 82 | { |
| 83 | FileContext *c = h->priv_data; |
| 84 | int r; |
| 85 | size = FFMIN(size, c->blocksize); |
| 86 | r = read(c->fd, buf, size); |
| 87 | return (-1 == r)?AVERROR(errno):r; |
| 88 | } |
| 89 | |
| 90 | static int file_write(URLContext *h, const unsigned char *buf, int size) |
| 91 | { |
| 92 | FileContext *c = h->priv_data; |
| 93 | int r; |
| 94 | size = FFMIN(size, c->blocksize); |
| 95 | r = write(c->fd, buf, size); |
| 96 | return (-1 == r)?AVERROR(errno):r; |
| 97 | } |
| 98 | |
| 99 | static int file_get_handle(URLContext *h) |
| 100 | { |
| 101 | FileContext *c = h->priv_data; |
| 102 | return c->fd; |
| 103 | } |
| 104 | |
| 105 | static int file_check(URLContext *h, int mask) |
| 106 | { |
| 107 | int ret = 0; |
| 108 | const char *filename = h->filename; |
| 109 | av_strstart(filename, "file:", &filename); |
| 110 | |
| 111 | { |
| 112 | #if HAVE_ACCESS && defined(R_OK) |
| 113 | if (access(filename, F_OK) < 0) |
| 114 | return AVERROR(errno); |
| 115 | if (mask&AVIO_FLAG_READ) |
| 116 | if (access(filename, R_OK) >= 0) |
| 117 | ret |= AVIO_FLAG_READ; |
| 118 | if (mask&AVIO_FLAG_WRITE) |
| 119 | if (access(filename, W_OK) >= 0) |
| 120 | ret |= AVIO_FLAG_WRITE; |
| 121 | #else |
| 122 | struct stat st; |
| 123 | ret = stat(filename, &st); |
| 124 | if (ret < 0) |
| 125 | return AVERROR(errno); |
| 126 | |
| 127 | ret |= st.st_mode&S_IRUSR ? mask&AVIO_FLAG_READ : 0; |
| 128 | ret |= st.st_mode&S_IWUSR ? mask&AVIO_FLAG_WRITE : 0; |
| 129 | #endif |
| 130 | } |
| 131 | return ret; |
| 132 | } |
| 133 | |
| 134 | #if CONFIG_FILE_PROTOCOL |
| 135 | |
| 136 | static int file_open(URLContext *h, const char *filename, int flags) |
| 137 | { |
| 138 | FileContext *c = h->priv_data; |
| 139 | int access; |
| 140 | int fd; |
| 141 | struct stat st; |
| 142 | |
| 143 | av_strstart(filename, "file:", &filename); |
| 144 | |
| 145 | if (flags & AVIO_FLAG_WRITE && flags & AVIO_FLAG_READ) { |
| 146 | access = O_CREAT | O_RDWR; |
| 147 | if (c->trunc) |
| 148 | access |= O_TRUNC; |
| 149 | } else if (flags & AVIO_FLAG_WRITE) { |
| 150 | access = O_CREAT | O_WRONLY; |
| 151 | if (c->trunc) |
| 152 | access |= O_TRUNC; |
| 153 | } else { |
| 154 | access = O_RDONLY; |
| 155 | } |
| 156 | #ifdef O_BINARY |
| 157 | access |= O_BINARY; |
| 158 | #endif |
| 159 | fd = avpriv_open(filename, access, 0666); |
| 160 | if (fd == -1) |
| 161 | return AVERROR(errno); |
| 162 | c->fd = fd; |
| 163 | |
| 164 | h->is_streamed = !fstat(fd, &st) && S_ISFIFO(st.st_mode); |
| 165 | |
| 166 | return 0; |
| 167 | } |
| 168 | |
| 169 | /* XXX: use llseek */ |
| 170 | static int64_t file_seek(URLContext *h, int64_t pos, int whence) |
| 171 | { |
| 172 | FileContext *c = h->priv_data; |
| 173 | int64_t ret; |
| 174 | |
| 175 | if (whence == AVSEEK_SIZE) { |
| 176 | struct stat st; |
| 177 | ret = fstat(c->fd, &st); |
| 178 | return ret < 0 ? AVERROR(errno) : (S_ISFIFO(st.st_mode) ? 0 : st.st_size); |
| 179 | } |
| 180 | |
| 181 | ret = lseek(c->fd, pos, whence); |
| 182 | |
| 183 | return ret < 0 ? AVERROR(errno) : ret; |
| 184 | } |
| 185 | |
| 186 | static int file_close(URLContext *h) |
| 187 | { |
| 188 | FileContext *c = h->priv_data; |
| 189 | return close(c->fd); |
| 190 | } |
| 191 | |
| 192 | URLProtocol ff_file_protocol = { |
| 193 | .name = "file", |
| 194 | .url_open = file_open, |
| 195 | .url_read = file_read, |
| 196 | .url_write = file_write, |
| 197 | .url_seek = file_seek, |
| 198 | .url_close = file_close, |
| 199 | .url_get_file_handle = file_get_handle, |
| 200 | .url_check = file_check, |
| 201 | .priv_data_size = sizeof(FileContext), |
| 202 | .priv_data_class = &file_class, |
| 203 | }; |
| 204 | |
| 205 | #endif /* CONFIG_FILE_PROTOCOL */ |
| 206 | |
| 207 | #if CONFIG_PIPE_PROTOCOL |
| 208 | |
| 209 | static int pipe_open(URLContext *h, const char *filename, int flags) |
| 210 | { |
| 211 | FileContext *c = h->priv_data; |
| 212 | int fd; |
| 213 | char *final; |
| 214 | av_strstart(filename, "pipe:", &filename); |
| 215 | |
| 216 | fd = strtol(filename, &final, 10); |
| 217 | if((filename == final) || *final ) {/* No digits found, or something like 10ab */ |
| 218 | if (flags & AVIO_FLAG_WRITE) { |
| 219 | fd = 1; |
| 220 | } else { |
| 221 | fd = 0; |
| 222 | } |
| 223 | } |
| 224 | #if HAVE_SETMODE |
| 225 | setmode(fd, O_BINARY); |
| 226 | #endif |
| 227 | c->fd = fd; |
| 228 | h->is_streamed = 1; |
| 229 | return 0; |
| 230 | } |
| 231 | |
| 232 | URLProtocol ff_pipe_protocol = { |
| 233 | .name = "pipe", |
| 234 | .url_open = pipe_open, |
| 235 | .url_read = file_read, |
| 236 | .url_write = file_write, |
| 237 | .url_get_file_handle = file_get_handle, |
| 238 | .url_check = file_check, |
| 239 | .priv_data_size = sizeof(FileContext), |
| 240 | .priv_data_class = &pipe_class, |
| 241 | }; |
| 242 | |
| 243 | #endif /* CONFIG_PIPE_PROTOCOL */ |