Type Alias SecTransformDataBlock

pub type SecTransformDataBlock = *mut DynBlock<dyn Fn(NonNull<CFType>) -> *const CFType>;

Available on crate features SecCustomTransform and block2 only.

A block used to override the default data handling for a transform.

Parameter data: The data to be processed. When this block is used to to implement the kSecTransformActionProcessData action, the data is the input data that is to be processed into the output data. When this block is used to implement the kSecTransformActionInternalizeExtraData action, the data is a CFDictionaryRef that contains the data that needs to be imported.

Returns: When this block is used to implment the kSecTransformActionProcessData action, the value returned is to be the data that will be passed to the output attribute. If an error occured while processing the input data then the block should return a CFErrorRef.

When this block is used to implement the kSecTransformActionInternalizeExtraData action then this block should return NULL or a CFErrorRef if an error occurred.

See the example program for more details.

See also Apple’s documentation