exif-loader.h File Reference

Defines the ExifLoader type. More...

#include <libexif/exif-data.h>
#include <libexif/exif-log.h>
#include <libexif/exif-mem.h>

Go to the source code of this file.

Typedefs
typedef struct _ExifLoader	ExifLoader
	Data used by the loader interface.

Functions
ExifLoader *	exif_loader_new (void)
	Allocate a new ExifLoader.
ExifLoader *	exif_loader_new_mem (ExifMem *mem)
	Allocate a new ExifLoader using the specified memory allocator.
void	exif_loader_ref (ExifLoader *loader)
	Increase the refcount of the ExifLoader.
void	exif_loader_unref (ExifLoader *loader)
	Decrease the refcount of the ExifLoader.
void	exif_loader_write_file (ExifLoader *loader, const char *fname)
	Load a file into the given ExifLoader from the filesystem.
unsigned char	exif_loader_write (ExifLoader *loader, unsigned char *buf, unsigned int sz)
	Load a buffer into the ExifLoader from a memory buffer.
void	exif_loader_reset (ExifLoader *loader)
	Free any data previously loaded and reset the ExifLoader to its newly-initialized state.
ExifData *	exif_loader_get_data (ExifLoader *loader)
	Create an ExifData from the data in the loader.
void	exif_loader_get_buf (ExifLoader *loader, const unsigned char **buf, unsigned int *buf_size)
	Return the raw data read by the loader.
void	exif_loader_log (ExifLoader *loader, ExifLog *log)
	Set the log message object used by this ExifLoader.

Detailed Description

Defines the ExifLoader type.

Function Documentation

exif_loader_get_buf()

void exif_loader_get_buf	(	ExifLoader *	loader,
		const unsigned char **	buf,
		unsigned int *	buf_size
	)

Return the raw data read by the loader.

The returned pointer is only guaranteed to be valid until the next call to a function modifying this ExifLoader. Either or both of buf and buf_size may be NULL on entry, in which case that value is not returned.

Parameters

[in]	loader	the loader
[out]	buf	read-only pointer to the data read by the loader, or NULL in case of error
[out]	buf_size	size of the data at buf, or 0 in case of error

exif_loader_get_data()

ExifData * exif_loader_get_data

(

ExifLoader *

loader

)

Create an ExifData from the data in the loader.

The loader must already contain data from a previous call to exif_loader_write_file or exif_loader_write.

Note

The ExifData returned is created using its default options, which may take effect before the data is returned. If other options are desired, an ExifData must be created explicitly and data extracted from the loader using exif_loader_get_buf instead.

Parameters

[in]

loader

the loader

Returns

allocated ExifData

See also

exif_loader_get_buf

exif_loader_log()

void exif_loader_log	(	ExifLoader *	loader,
		ExifLog *	log
	)

Set the log message object used by this ExifLoader.

Parameters

[in]	loader	the loader
[in]	log	ExifLog

exif_loader_new()

ExifLoader * exif_loader_new

(

void

)

Allocate a new ExifLoader.

Returns

allocated ExifLoader

exif_loader_new_mem()

ExifLoader * exif_loader_new_mem

(

ExifMem *

mem

)

Allocate a new ExifLoader using the specified memory allocator.

Parameters

[in]

mem

the ExifMem

Returns

allocated ExifLoader

exif_loader_ref()

void exif_loader_ref

(

ExifLoader *

loader

)

Increase the refcount of the ExifLoader.

Parameters

[in]

loader

the ExifLoader to increase the refcount of.

exif_loader_reset()

void exif_loader_reset

(

ExifLoader *

loader

)

Free any data previously loaded and reset the ExifLoader to its newly-initialized state.

Parameters

[in]

loader

the loader

exif_loader_unref()

void exif_loader_unref

(

ExifLoader *

loader

)

Decrease the refcount of the ExifLoader.

If the refcount reaches 0, the loader is freed.

Parameters

[in]

loader

ExifLoader for which to decrease the refcount

exif_loader_write()

unsigned char exif_loader_write	(	ExifLoader *	loader,
		unsigned char *	buf,
		unsigned int	sz
	)

Load a buffer into the ExifLoader from a memory buffer.

The relevant data is copied in raw form into the ExifLoader.

Parameters

[in]	loader	loader to write to
[in]	buf	buffer to read from
[in]	sz	size of the buffer

Returns

1 while EXIF data is read (or while there is still hope that there will be EXIF data later on), 0 otherwise.

exif_loader_write_file()

void exif_loader_write_file	(	ExifLoader *	loader,
		const char *	fname
	)

Load a file into the given ExifLoader from the filesystem.

The relevant data is copied in raw form into the ExifLoader.

Parameters

[in]	loader	loader to write to
[in]	fname	path to the file to read