summaryrefslogtreecommitdiff
path: root/libavformat/file.c (plain)
blob: 264542a36a7dd05173b6de1ce2cd1af0d5900510
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#if HAVE_DIRENT_H
27#include <dirent.h>
28#endif
29#include <fcntl.h>
30#if HAVE_IO_H
31#include <io.h>
32#endif
33#if HAVE_UNISTD_H
34#include <unistd.h>
35#endif
36#include <sys/stat.h>
37#include <stdlib.h>
38#include "os_support.h"
39#include "url.h"
40
41/* Some systems may not have S_ISFIFO */
42#ifndef S_ISFIFO
43# ifdef S_IFIFO
44# define S_ISFIFO(m) (((m) & S_IFMT) == S_IFIFO)
45# else
46# define S_ISFIFO(m) 0
47# endif
48#endif
49
50/* Not available in POSIX.1-1996 */
51#ifndef S_ISLNK
52# ifdef S_IFLNK
53# define S_ISLNK(m) (((m) & S_IFLNK) == S_IFLNK)
54# else
55# define S_ISLNK(m) 0
56# endif
57#endif
58
59/* Not available in POSIX.1-1996 */
60#ifndef S_ISSOCK
61# ifdef S_IFSOCK
62# define S_ISSOCK(m) (((m) & S_IFMT) == S_IFSOCK)
63# else
64# define S_ISSOCK(m) 0
65# endif
66#endif
67
68/* standard file protocol */
69
70typedef struct FileContext {
71 const AVClass *class;
72 int fd;
73 int trunc;
74 int blocksize;
75 int follow;
76#if HAVE_DIRENT_H
77 DIR *dir;
78#endif
79} FileContext;
80
81static const AVOption file_options[] = {
82 { "truncate", "truncate existing files on write", offsetof(FileContext, trunc), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, AV_OPT_FLAG_ENCODING_PARAM },
83 { "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 },
84 { "follow", "Follow a file as it is being written", offsetof(FileContext, follow), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
85 { NULL }
86};
87
88static const AVOption pipe_options[] = {
89 { "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 },
90 { NULL }
91};
92
93static const AVClass file_class = {
94 .class_name = "file",
95 .item_name = av_default_item_name,
96 .option = file_options,
97 .version = LIBAVUTIL_VERSION_INT,
98};
99
100static const AVClass pipe_class = {
101 .class_name = "pipe",
102 .item_name = av_default_item_name,
103 .option = pipe_options,
104 .version = LIBAVUTIL_VERSION_INT,
105};
106
107static int file_read(URLContext *h, unsigned char *buf, int size)
108{
109 FileContext *c = h->priv_data;
110 int ret;
111 size = FFMIN(size, c->blocksize);
112 ret = read(c->fd, buf, size);
113 if (ret == 0 && c->follow)
114 return AVERROR(EAGAIN);
115 return (ret == -1) ? AVERROR(errno) : ret;
116}
117
118static int file_write(URLContext *h, const unsigned char *buf, int size)
119{
120 FileContext *c = h->priv_data;
121 int ret;
122 size = FFMIN(size, c->blocksize);
123 ret = write(c->fd, buf, size);
124 return (ret == -1) ? AVERROR(errno) : ret;
125}
126
127static int file_get_handle(URLContext *h)
128{
129 FileContext *c = h->priv_data;
130 return c->fd;
131}
132
133static int file_check(URLContext *h, int mask)
134{
135 int ret = 0;
136 const char *filename = h->filename;
137 av_strstart(filename, "file:", &filename);
138
139 {
140#if HAVE_ACCESS && defined(R_OK)
141 if (access(filename, F_OK) < 0)
142 return AVERROR(errno);
143 if (mask&AVIO_FLAG_READ)
144 if (access(filename, R_OK) >= 0)
145 ret |= AVIO_FLAG_READ;
146 if (mask&AVIO_FLAG_WRITE)
147 if (access(filename, W_OK) >= 0)
148 ret |= AVIO_FLAG_WRITE;
149#else
150 struct stat st;
151# ifndef _WIN32
152 ret = stat(filename, &st);
153# else
154 ret = win32_stat(filename, &st);
155# endif
156 if (ret < 0)
157 return AVERROR(errno);
158
159 ret |= st.st_mode&S_IRUSR ? mask&AVIO_FLAG_READ : 0;
160 ret |= st.st_mode&S_IWUSR ? mask&AVIO_FLAG_WRITE : 0;
161#endif
162 }
163 return ret;
164}
165
166static int file_delete(URLContext *h)
167{
168#if HAVE_UNISTD_H
169 int ret;
170 const char *filename = h->filename;
171 av_strstart(filename, "file:", &filename);
172
173 ret = rmdir(filename);
174 if (ret < 0 && errno == ENOTDIR)
175 ret = unlink(filename);
176 if (ret < 0)
177 return AVERROR(errno);
178
179 return ret;
180#else
181 return AVERROR(ENOSYS);
182#endif /* HAVE_UNISTD_H */
183}
184
185static int file_move(URLContext *h_src, URLContext *h_dst)
186{
187 const char *filename_src = h_src->filename;
188 const char *filename_dst = h_dst->filename;
189 av_strstart(filename_src, "file:", &filename_src);
190 av_strstart(filename_dst, "file:", &filename_dst);
191
192 if (rename(filename_src, filename_dst) < 0)
193 return AVERROR(errno);
194
195 return 0;
196}
197
198#if CONFIG_FILE_PROTOCOL
199
200static int file_open(URLContext *h, const char *filename, int flags)
201{
202 FileContext *c = h->priv_data;
203 int access;
204 int fd;
205 struct stat st;
206
207 av_strstart(filename, "file:", &filename);
208
209 if (flags & AVIO_FLAG_WRITE && flags & AVIO_FLAG_READ) {
210 access = O_CREAT | O_RDWR;
211 if (c->trunc)
212 access |= O_TRUNC;
213 } else if (flags & AVIO_FLAG_WRITE) {
214 access = O_CREAT | O_WRONLY;
215 if (c->trunc)
216 access |= O_TRUNC;
217 } else {
218 access = O_RDONLY;
219 }
220#ifdef O_BINARY
221 access |= O_BINARY;
222#endif
223 fd = avpriv_open(filename, access, 0666);
224 if (fd == -1)
225 return AVERROR(errno);
226 c->fd = fd;
227
228 h->is_streamed = !fstat(fd, &st) && S_ISFIFO(st.st_mode);
229
230 return 0;
231}
232
233/* XXX: use llseek */
234static int64_t file_seek(URLContext *h, int64_t pos, int whence)
235{
236 FileContext *c = h->priv_data;
237 int64_t ret;
238
239 if (whence == AVSEEK_SIZE) {
240 struct stat st;
241 ret = fstat(c->fd, &st);
242 return ret < 0 ? AVERROR(errno) : (S_ISFIFO(st.st_mode) ? 0 : st.st_size);
243 }
244
245 ret = lseek(c->fd, pos, whence);
246
247 return ret < 0 ? AVERROR(errno) : ret;
248}
249
250static int file_close(URLContext *h)
251{
252 FileContext *c = h->priv_data;
253 return close(c->fd);
254}
255
256static int file_open_dir(URLContext *h)
257{
258#if HAVE_LSTAT
259 FileContext *c = h->priv_data;
260
261 c->dir = opendir(h->filename);
262 if (!c->dir)
263 return AVERROR(errno);
264
265 return 0;
266#else
267 return AVERROR(ENOSYS);
268#endif /* HAVE_LSTAT */
269}
270
271static int file_read_dir(URLContext *h, AVIODirEntry **next)
272{
273#if HAVE_LSTAT
274 FileContext *c = h->priv_data;
275 struct dirent *dir;
276 char *fullpath = NULL;
277
278 *next = ff_alloc_dir_entry();
279 if (!*next)
280 return AVERROR(ENOMEM);
281 do {
282 errno = 0;
283 dir = readdir(c->dir);
284 if (!dir) {
285 av_freep(next);
286 return AVERROR(errno);
287 }
288 } while (!strcmp(dir->d_name, ".") || !strcmp(dir->d_name, ".."));
289
290 fullpath = av_append_path_component(h->filename, dir->d_name);
291 if (fullpath) {
292 struct stat st;
293 if (!lstat(fullpath, &st)) {
294 if (S_ISDIR(st.st_mode))
295 (*next)->type = AVIO_ENTRY_DIRECTORY;
296 else if (S_ISFIFO(st.st_mode))
297 (*next)->type = AVIO_ENTRY_NAMED_PIPE;
298 else if (S_ISCHR(st.st_mode))
299 (*next)->type = AVIO_ENTRY_CHARACTER_DEVICE;
300 else if (S_ISBLK(st.st_mode))
301 (*next)->type = AVIO_ENTRY_BLOCK_DEVICE;
302 else if (S_ISLNK(st.st_mode))
303 (*next)->type = AVIO_ENTRY_SYMBOLIC_LINK;
304 else if (S_ISSOCK(st.st_mode))
305 (*next)->type = AVIO_ENTRY_SOCKET;
306 else if (S_ISREG(st.st_mode))
307 (*next)->type = AVIO_ENTRY_FILE;
308 else
309 (*next)->type = AVIO_ENTRY_UNKNOWN;
310
311 (*next)->group_id = st.st_gid;
312 (*next)->user_id = st.st_uid;
313 (*next)->size = st.st_size;
314 (*next)->filemode = st.st_mode & 0777;
315 (*next)->modification_timestamp = INT64_C(1000000) * st.st_mtime;
316 (*next)->access_timestamp = INT64_C(1000000) * st.st_atime;
317 (*next)->status_change_timestamp = INT64_C(1000000) * st.st_ctime;
318 }
319 av_free(fullpath);
320 }
321
322 (*next)->name = av_strdup(dir->d_name);
323 return 0;
324#else
325 return AVERROR(ENOSYS);
326#endif /* HAVE_LSTAT */
327}
328
329static int file_close_dir(URLContext *h)
330{
331#if HAVE_LSTAT
332 FileContext *c = h->priv_data;
333 closedir(c->dir);
334 return 0;
335#else
336 return AVERROR(ENOSYS);
337#endif /* HAVE_LSTAT */
338}
339
340const URLProtocol ff_file_protocol = {
341 .name = "file",
342 .url_open = file_open,
343 .url_read = file_read,
344 .url_write = file_write,
345 .url_seek = file_seek,
346 .url_close = file_close,
347 .url_get_file_handle = file_get_handle,
348 .url_check = file_check,
349 .url_delete = file_delete,
350 .url_move = file_move,
351 .priv_data_size = sizeof(FileContext),
352 .priv_data_class = &file_class,
353 .url_open_dir = file_open_dir,
354 .url_read_dir = file_read_dir,
355 .url_close_dir = file_close_dir,
356 .default_whitelist = "file,crypto"
357};
358
359#endif /* CONFIG_FILE_PROTOCOL */
360
361#if CONFIG_PIPE_PROTOCOL
362
363static int pipe_open(URLContext *h, const char *filename, int flags)
364{
365 FileContext *c = h->priv_data;
366 int fd;
367 char *final;
368 av_strstart(filename, "pipe:", &filename);
369
370 fd = strtol(filename, &final, 10);
371 if((filename == final) || *final ) {/* No digits found, or something like 10ab */
372 if (flags & AVIO_FLAG_WRITE) {
373 fd = 1;
374 } else {
375 fd = 0;
376 }
377 }
378#if HAVE_SETMODE
379 setmode(fd, O_BINARY);
380#endif
381 c->fd = fd;
382 h->is_streamed = 1;
383 return 0;
384}
385
386const URLProtocol ff_pipe_protocol = {
387 .name = "pipe",
388 .url_open = pipe_open,
389 .url_read = file_read,
390 .url_write = file_write,
391 .url_get_file_handle = file_get_handle,
392 .url_check = file_check,
393 .priv_data_size = sizeof(FileContext),
394 .priv_data_class = &pipe_class,
395 .default_whitelist = "crypto"
396};
397
398#endif /* CONFIG_PIPE_PROTOCOL */
399
generated by cgit at 2024-05-17 02:11:02 (GMT)