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file.h
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #ifndef AVUTIL_FILE_H
20 #define AVUTIL_FILE_H
21 
22 #include <stdint.h>
23 
24 #include "avutil.h"
25 
26 /**
27  * @file
28  * Misc file utilities.
29  */
30 
31 /**
32  * Read the file with name filename, and put its content in a newly
33  * allocated buffer or map it with mmap() when available.
34  * In case of success set *bufptr to the read or mmapped buffer, and
35  * *size to the size in bytes of the buffer in *bufptr.
36  * The returned buffer must be released with av_file_unmap().
37  *
38  * @param log_offset loglevel offset used for logging
39  * @param log_ctx context used for logging
40  * @return a non negative number in case of success, a negative value
41  * corresponding to an AVERROR error code in case of failure
42  */
43 int av_file_map(const char *filename, uint8_t **bufptr, size_t *size,
44  int log_offset, void *log_ctx);
45 
46 /**
47  * Unmap or free the buffer bufptr created by av_file_map().
48  *
49  * @param size size in bytes of bufptr, must be the same as returned
50  * by av_file_map()
51  */
52 void av_file_unmap(uint8_t *bufptr, size_t size);
53 
54 /**
55  * Wrapper to work around the lack of mkstemp() on mingw.
56  * Also, tries to create file in /tmp first, if possible.
57  * *prefix can be a character constant; *filename will be allocated internally.
58  * @return file descriptor of opened file (or -1 on error)
59  * and opened file name in **filename.
60  * @note On very old libcs it is necessary to set a secure umask before
61  * calling this, av_tempfile() cant call umask itself as it is used in
62  * libraries and could interfere with the calling application.
63  */
64 int av_tempfile(const char *prefix, char **filename, int log_offset, void *log_ctx);
65 
66 #endif /* AVUTIL_FILE_H */