file.c File Reference

#include "config.h"
#include "file.h"
#include "internal.h"
#include "log.h"
#include "mem.h"
#include <fcntl.h>
#include <sys/stat.h>

Go to the source code of this file.

Data Structures
struct	FileLogContext

Functions
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() when available. More...
void	av_file_unmap (uint8_t *bufptr, size_t size)
	Unmap or free the buffer bufptr created by av_file_map(). More...
int	av_tempfile (const char *prefix, char **filename, int log_offset, void *log_ctx)
	Wrapper to work around the lack of mkstemp() on mingw. More...

Variables
static const AVClass	file_log_ctx_class

Function Documentation

av_file_map()

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() when available.

In case of success set *bufptr to the read or mmapped buffer, and *size to the size in bytes of the buffer in *bufptr. Unlike mmap this function succeeds with zero sized files, in this case *bufptr will be set to NULL and *size will be set to 0. The returned buffer must be released with av_file_unmap().

Parameters

log_offset	loglevel offset used for logging
log_ctx	context used for logging

Returns

a non negative number in case of success, a negative value corresponding to an AVERROR error code in case of failure

Examples

avio_reading.c.

Definition at line 53 of file file.c.

Referenced by init(), init_pattern_from_file(), init_vulkan(), load_textfile(), main(), parse_psfile(), and read_shape_from_file().

av_file_unmap()

void av_file_unmap	(	uint8_t *	bufptr,
		size_t	size
	)

Unmap or free the buffer bufptr created by av_file_map().

Parameters

size	size in bytes of bufptr, must be the same as returned by av_file_map()

Examples

avio_reading.c.

Definition at line 144 of file file.c.

Referenced by init(), init_vulkan(), load_textfile(), main(), parse_psfile(), read_shape_from_file(), and uninit().

av_tempfile()

int av_tempfile	(	const char *	prefix,
		char **	filename,
		int	log_offset,
		void *	log_ctx
	)

Wrapper to work around the lack of mkstemp() on mingw.

Also, tries to create file in /tmp first, if possible. *prefix can be a character constant; *filename will be allocated internally.

Returns

file descriptor of opened file (or negative value corresponding to an AVERROR code on error) and opened file name in **filename.

Note

On very old libcs it is necessary to set a secure umask before calling this, av_tempfile() can't call umask itself as it is used in libraries and could interfere with the calling application.

Deprecated:

as fd numbers cannot be passed saftely between libs on some platforms

Definition at line 157 of file file.c.

Variable Documentation

file_log_ctx_class

const AVClass file_log_ctx_class

static

Initial value:

= {
    .class_name                = "FILE",
    .item_name                 = av_default_item_name,
    .option                    = NULL,
    .version                   = LIBAVUTIL_VERSION_INT,
    .log_level_offset_offset   = 0x42,
    .parent_log_context_offset = 0x42,
}

Definition at line 44 of file file.c.

Referenced by av_file_map().