FFmpeg 5.1.6
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 <stddef.h>
23#include <stdint.h>
24
25#include "attributes.h"
26
27/**
28 * @file
29 * Misc file utilities.
30 */
31
32/**
33 * Read the file with name filename, and put its content in a newly
34 * allocated buffer or map it with mmap() when available.
35 * In case of success set *bufptr to the read or mmapped buffer, and
36 * *size to the size in bytes of the buffer in *bufptr.
37 * Unlike mmap this function succeeds with zero sized files, in this
38 * case *bufptr will be set to NULL and *size will be set to 0.
39 * The returned buffer must be released with av_file_unmap().
40 *
41 * @param log_offset loglevel offset used for logging
42 * @param log_ctx context used for logging
43 * @return a non negative number in case of success, a negative value
44 * corresponding to an AVERROR error code in case of failure
45 */
47int av_file_map(const char *filename, uint8_t **bufptr, size_t *size,
48 int log_offset, void *log_ctx);
49
50/**
51 * Unmap or free the buffer bufptr created by av_file_map().
52 *
53 * @param size size in bytes of bufptr, must be the same as returned
54 * by av_file_map()
55 */
56void av_file_unmap(uint8_t *bufptr, size_t size);
57
58/**
59 * Wrapper to work around the lack of mkstemp() on mingw.
60 * Also, tries to create file in /tmp first, if possible.
61 * *prefix can be a character constant; *filename will be allocated internally.
62 * @return file descriptor of opened file (or negative value corresponding to an
63 * AVERROR code on error)
64 * and opened file name in **filename.
65 * @note On very old libcs it is necessary to set a secure umask before
66 * calling this, av_tempfile() can't call umask itself as it is used in
67 * libraries and could interfere with the calling application.
68 * @deprecated as fd numbers cannot be passed saftely between libs on some platforms
69 */
70int av_tempfile(const char *prefix, char **filename, int log_offset, void *log_ctx);
71
72#endif /* AVUTIL_FILE_H */
Macro definitions for various function/variable attributes.
#define av_warn_unused_result
Definition: attributes.h:62
void av_file_unmap(uint8_t *bufptr, size_t size)
Unmap or free the buffer bufptr created by av_file_map().
int av_tempfile(const char *prefix, char **filename, int log_offset, void *log_ctx)
Wrapper to work around the lack of mkstemp() on mingw.
av_warn_unused_result int av_file_map(const char *filename, uint8_t **bufptr, size_t *size, int log_offset, void *log_ctx)
Read the file with name filename, and put its content in a newly allocated buffer or map it with mmap...