summaryrefslogtreecommitdiffstats
path: root/libavformat/file.c
blob: 1d321c42050e31588a411583c4f9578254460ac0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
/*
 * buffered file I/O
 * Copyright (c) 2001 Fabrice Bellard
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "libavutil/avstring.h"
#include "libavutil/internal.h"
#include "libavutil/opt.h"
#include "avformat.h"
#if HAVE_DIRENT_H
#include <dirent.h>
#endif
#include <fcntl.h>
#if HAVE_IO_H
#include <io.h>
#endif
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <sys/stat.h>
#include <stdlib.h>
#include "os_support.h"
#include "url.h"

/* Some systems may not have S_ISFIFO */
#ifndef S_ISFIFO
#  ifdef S_IFIFO
#    define S_ISFIFO(m) (((m) & S_IFMT) == S_IFIFO)
#  else
#    define S_ISFIFO(m) 0
#  endif
#endif

/* Not available in POSIX.1-1996 */
#ifndef S_ISLNK
#  ifdef S_IFLNK
#    define S_ISLNK(m) (((m) & S_IFLNK) == S_IFLNK)
#  else
#    define S_ISLNK(m) 0
#  endif
#endif

/* Not available in POSIX.1-1996 */
#ifndef S_ISSOCK
#  ifdef S_IFSOCK
#    define S_ISSOCK(m) (((m) & S_IFMT) == S_IFSOCK)
#  else
#    define S_ISSOCK(m) 0
#  endif
#endif

/* standard file protocol */

typedef struct FileContext {
    const AVClass *class;
    int fd;
    int trunc;
    int blocksize;
    int follow;
#if HAVE_DIRENT_H
    DIR *dir;
#endif
} FileContext;

static const AVOption file_options[] = {
    { "truncate", "truncate existing files on write", offsetof(FileContext, trunc), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, AV_OPT_FLAG_ENCODING_PARAM },
    { "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 },
    { "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 },
    { NULL }
};

static const AVOption pipe_options[] = {
    { "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 },
    { NULL }
};

static const AVClass file_class = {
    .class_name = "file",
    .item_name  = av_default_item_name,
    .option     = file_options,
    .version    = LIBAVUTIL_VERSION_INT,
};

static const AVClass pipe_class = {
    .class_name = "pipe",
    .item_name  = av_default_item_name,
    .option     = pipe_options,
    .version    = LIBAVUTIL_VERSION_INT,
};

static int file_read(URLContext *h, unsigned char *buf, int size)
{
    FileContext *c = h->priv_data;
    int ret;
    size = FFMIN(size, c->blocksize);
    ret = read(c->fd, buf, size);
    if (ret == 0 && c->follow)
        return AVERROR(EAGAIN);
    if (ret == 0)
        return AVERROR_EOF;
    return (ret == -1) ? AVERROR(errno) : ret;
}

static int file_write(URLContext *h, const unsigned char *buf, int size)
{
    FileContext *c = h->priv_data;
    int ret;
    size = FFMIN(size, c->blocksize);
    ret = write(c->fd, buf, size);
    return (ret == -1) ? AVERROR(errno) : ret;
}

static int file_get_handle(URLContext *h)
{
    FileContext *c = h->priv_data;
    return c->fd;
}

static int file_check(URLContext *h, int mask)
{
    int ret = 0;
    const char *filename = h->filename;
    av_strstart(filename, "file:", &filename);

    {
#if HAVE_ACCESS && defined(R_OK)
    if (access(filename, F_OK) < 0)
        return AVERROR(errno);
    if (mask&AVIO_FLAG_READ)
        if (access(filename, R_OK) >= 0)
            ret |= AVIO_FLAG_READ;
    if (mask&AVIO_FLAG_WRITE)
        if (access(filename, W_OK) >= 0)
            ret |= AVIO_FLAG_WRITE;
#else
    struct stat st;
#   ifndef _WIN32
    ret = stat(filename, &st);
#   else
    ret = win32_stat(filename, &st);
#   endif
    if (ret < 0)
        return AVERROR(errno);

    ret |= st.st_mode&S_IRUSR ? mask&AVIO_FLAG_READ  : 0;
    ret |= st.st_mode&S_IWUSR ? mask&AVIO_FLAG_WRITE : 0;
#endif
    }
    return ret;
}

static int file_delete(URLContext *h)
{
#if HAVE_UNISTD_H
    int ret;
    const char *filename = h->filename;
    av_strstart(filename, "file:", &filename);

    ret = rmdir(filename);
    if (ret < 0 && errno == ENOTDIR)
        ret = unlink(filename);
    if (ret < 0)
        return AVERROR(errno);

    return ret;
#else
    return AVERROR(ENOSYS);
#endif /* HAVE_UNISTD_H */
}

static int file_move(URLContext *h_src, URLContext *h_dst)
{
    const char *filename_src = h_src->filename;
    const char *filename_dst = h_dst->filename;
    av_strstart(filename_src, "file:", &filename_src);
    av_strstart(filename_dst, "file:", &filename_dst);

    if (rename(filename_src, filename_dst) < 0)
        return AVERROR(errno);

    return 0;
}

#if CONFIG_FILE_PROTOCOL

static int file_open(URLContext *h, const char *filename, int flags)
{
    FileContext *c = h->priv_data;
    int access;
    int fd;
    struct stat st;

    av_strstart(filename, "file:", &filename);

    if (flags & AVIO_FLAG_WRITE && flags & AVIO_FLAG_READ) {
        access = O_CREAT | O_RDWR;
        if (c->trunc)
            access |= O_TRUNC;
    } else if (flags & AVIO_FLAG_WRITE) {
        access = O_CREAT | O_WRONLY;
        if (c->trunc)
            access |= O_TRUNC;
    } else {
        access = O_RDONLY;
    }
#ifdef O_BINARY
    access |= O_BINARY;
#endif
    fd = avpriv_open(filename, access, 0666);
    if (fd == -1)
        return AVERROR(errno);
    c->fd = fd;

    h->is_streamed = !fstat(fd, &st) && S_ISFIFO(st.st_mode);

    /* Buffer writes more than the default 32k to improve throughput especially
     * with networked file systems */
    if (!h->is_streamed && flags & AVIO_FLAG_WRITE)
        h->min_packet_size = h->max_packet_size = 262144;

    return 0;
}

/* XXX: use llseek */
static int64_t file_seek(URLContext *h, int64_t pos, int whence)
{
    FileContext *c = h->priv_data;
    int64_t ret;

    if (whence == AVSEEK_SIZE) {
        struct stat st;
        ret = fstat(c->fd, &st);
        return ret < 0 ? AVERROR(errno) : (S_ISFIFO(st.st_mode) ? 0 : st.st_size);
    }

    ret = lseek(c->fd, pos, whence);

    return ret < 0 ? AVERROR(errno) : ret;
}

static int file_close(URLContext *h)
{
    FileContext *c = h->priv_data;
    return close(c->fd);
}

static int file_open_dir(URLContext *h)
{
#if HAVE_LSTAT
    FileContext *c = h->priv_data;

    c->dir = opendir(h->filename);
    if (!c->dir)
        return AVERROR(errno);

    return 0;
#else
    return AVERROR(ENOSYS);
#endif /* HAVE_LSTAT */
}

static int file_read_dir(URLContext *h, AVIODirEntry **next)
{
#if HAVE_LSTAT
    FileContext *c = h->priv_data;
    struct dirent *dir;
    char *fullpath = NULL;

    *next = ff_alloc_dir_entry();
    if (!*next)
        return AVERROR(ENOMEM);
    do {
        errno = 0;
        dir = readdir(c->dir);
        if (!dir) {
            av_freep(next);
            return AVERROR(errno);
        }
    } while (!strcmp(dir->d_name, ".") || !strcmp(dir->d_name, ".."));

    fullpath = av_append_path_component(h->filename, dir->d_name);
    if (fullpath) {
        struct stat st;
        if (!lstat(fullpath, &st)) {
            if (S_ISDIR(st.st_mode))
                (*next)->type = AVIO_ENTRY_DIRECTORY;
            else if (S_ISFIFO(st.st_mode))
                (*next)->type = AVIO_ENTRY_NAMED_PIPE;
            else if (S_ISCHR(st.st_mode))
                (*next)->type = AVIO_ENTRY_CHARACTER_DEVICE;
            else if (S_ISBLK(st.st_mode))
                (*next)->type = AVIO_ENTRY_BLOCK_DEVICE;
            else if (S_ISLNK(st.st_mode))
                (*next)->type = AVIO_ENTRY_SYMBOLIC_LINK;
            else if (S_ISSOCK(st.st_mode))
                (*next)->type = AVIO_ENTRY_SOCKET;
            else if (S_ISREG(st.st_mode))
                (*next)->type = AVIO_ENTRY_FILE;
            else
                (*next)->type = AVIO_ENTRY_UNKNOWN;

            (*next)->group_id = st.st_gid;
            (*next)->user_id = st.st_uid;
            (*next)->size = st.st_size;
            (*next)->filemode = st.st_mode & 0777;
            (*next)->modification_timestamp = INT64_C(1000000) * st.st_mtime;
            (*next)->access_timestamp =  INT64_C(1000000) * st.st_atime;
            (*next)->status_change_timestamp = INT64_C(1000000) * st.st_ctime;
        }
        av_free(fullpath);
    }

    (*next)->name = av_strdup(dir->d_name);
    return 0;
#else
    return AVERROR(ENOSYS);
#endif /* HAVE_LSTAT */
}

static int file_close_dir(URLContext *h)
{
#if HAVE_LSTAT
    FileContext *c = h->priv_data;
    closedir(c->dir);
    return 0;
#else
    return AVERROR(ENOSYS);
#endif /* HAVE_LSTAT */
}

const URLProtocol ff_file_protocol = {
    .name                = "file",
    .url_open            = file_open,
    .url_read            = file_read,
    .url_write           = file_write,
    .url_seek            = file_seek,
    .url_close           = file_close,
    .url_get_file_handle = file_get_handle,
    .url_check           = file_check,
    .url_delete          = file_delete,
    .url_move            = file_move,
    .priv_data_size      = sizeof(FileContext),
    .priv_data_class     = &file_class,
    .url_open_dir        = file_open_dir,
    .url_read_dir        = file_read_dir,
    .url_close_dir       = file_close_dir,
    .default_whitelist   = "file,crypto"
};

#endif /* CONFIG_FILE_PROTOCOL */

#if CONFIG_PIPE_PROTOCOL

static int pipe_open(URLContext *h, const char *filename, int flags)
{
    FileContext *c = h->priv_data;
    int fd;
    char *final;
    av_strstart(filename, "pipe:", &filename);

    fd = strtol(filename, &final, 10);
    if((filename == final) || *final ) {/* No digits found, or something like 10ab */
        if (flags & AVIO_FLAG_WRITE) {
            fd = 1;
        } else {
            fd = 0;
        }
    }
#if HAVE_SETMODE
    setmode(fd, O_BINARY);
#endif
    c->fd = fd;
    h->is_streamed = 1;
    return 0;
}

const URLProtocol ff_pipe_protocol = {
    .name                = "pipe",
    .url_open            = pipe_open,
    .url_read            = file_read,
    .url_write           = file_write,
    .url_get_file_handle = file_get_handle,
    .url_check           = file_check,
    .priv_data_size      = sizeof(FileContext),
    .priv_data_class     = &pipe_class,
    .default_whitelist   = "crypto"
};

#endif /* CONFIG_PIPE_PROTOCOL */
OpenPOWER on IntegriCloud