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Add vips_foreign_is_a_buffer() method

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This commits adds a vips_foreign_is_a_buffer() method, similar to
vips_foreign_is_a().
This commit is contained in:
Maurus Cuelenaere 2015-02-15 16:31:23 +01:00
parent be5052d0c3
commit 3d067af889
2 changed files with 28 additions and 0 deletions
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27
libvips/foreign/foreign.c
View File

@ -615,6 +615,33 @@ vips_foreign_is_a( const char *loader, const char *filename )
return( FALSE );
}
/**
* vips_foreign_is_a_buffer:
* @loader: name of loader to use for test
* @data: pointer to the buffer to test
* @size: size of the buffer to test
*
* Return %TRUE if @data can be loaded by @loader. @loader is something
* like "tiffload_buffer" or "VipsForeignLoadTiffBuffer".
*
* Returns: %TRUE if @data can be loaded by @loader.
*/
gboolean
vips_foreign_is_a_buffer( const char *loader, void *data, size_t size )
{
VipsObjectClass *class;
VipsForeignLoadClass *load_class;
if( !(class = vips_class_find( "VipsForeignLoad", loader )) )
return( FALSE );
load_class = VIPS_FOREIGN_LOAD_CLASS( class );
if( load_class->is_a_buffer &&
load_class->is_a_buffer( data, size ) )
return( TRUE );
return( FALSE );
}
/**
* vips_foreign_flags:
* @loader: name of loader to use for test

1
libvips/include/vips/foreign.h
View File

@ -218,6 +218,7 @@ const char *vips_foreign_find_load_buffer( void *data, size_t size );
VipsForeignFlags vips_foreign_flags( const char *loader, const char *filename );
gboolean vips_foreign_is_a( const char *loader, const char *filename );
gboolean vips_foreign_is_a_buffer( const char *loader, void *data, size_t size );
#define VIPS_TYPE_FOREIGN_SAVE (vips_foreign_save_get_type())
#define VIPS_FOREIGN_SAVE( obj ) \