vlc_diffutil.h File Reference

Include dependency graph for vlc_diffutil.h:

Go to the source code of this file.

Data Structures
struct	vlc_diffutil_callback_t
	this structure defines callback to access and compare elements from the old and the new list More...
struct	vlc_diffutil_snake_callback_t
struct	vlc_diffutil_insert
	The data positioned at newModel[ y ] is inserted at position index in the current model. More...
struct	vlc_diffutil_remove
	The data positioned at oldModel[ y ] is removed at position index in the current model. More...
struct	vlc_diffutil_move
	Moves the data from position model[ from ] to model[ to ] the data is available either at newModel[ y ] or oldModel[ x ]. More...
struct	vlc_diffutil_change_t
	represent a change to the model, each change assumes that previous changes have already been applied More...
struct	vlc_diffutil_changelist_t

Typedefs
typedef struct diffutil_snake_t	diffutil_snake_t

Enumerations
enum	vlc_diffutil_op_type { VLC_DIFFUTIL_OP_INSERT , VLC_DIFFUTIL_OP_REMOVE , VLC_DIFFUTIL_OP_MOVE , VLC_DIFFUTIL_OP_IGNORE }
enum	vlc_diffutil_result_flag { VLC_DIFFUTIL_RESULT_MOVE = 0x1 , VLC_DIFFUTIL_RESULT_AGGREGATE = 0x2 }

Functions
struct diffutil_snake_t *	vlc_diffutil_build_snake (const vlc_diffutil_callback_t *diffOp, const void *dataOld, const void *dataNew)
	vlc_diffutil_build_snake compute a diff model between the dataOld model and the dataNew model.
void	vlc_diffutil_free_snake (struct diffutil_snake_t *snake)
	free the snake created by vlc_diffutil_build_snake
bool	vlc_diffutil_walk_snake (const diffutil_snake_t *snake, const vlc_diffutil_snake_callback_t *snakeOp, void *cbData, const vlc_diffutil_callback_t *diffOp, const void *dataOld, const void *dataNew)
	iterate over the changelist and callback user on each operation (keep/insert/remove)
vlc_diffutil_changelist_t *	vlc_diffutil_build_change_list (const struct diffutil_snake_t *snake, const vlc_diffutil_callback_t *diffOp, const void *dataOld, const void *dataNew, int flags)
	vlc_diffutil_build_change_list creates a list of changes to apply to transform dataOld into dataNew
void	vlc_diffutil_free_change_list (vlc_diffutil_changelist_t *changelist)
	free the changelist created by vlc_diffutil_build_change_list

Typedef Documentation

diffutil_snake_t

typedef struct diffutil_snake_t diffutil_snake_t

Enumeration Type Documentation

vlc_diffutil_op_type

enum vlc_diffutil_op_type

Enumerator
VLC_DIFFUTIL_OP_INSERT	items have been added to the list
VLC_DIFFUTIL_OP_REMOVE	items have been removed from the list
VLC_DIFFUTIL_OP_MOVE	items have been moved within the list
VLC_DIFFUTIL_OP_IGNORE	current change should be ignored

vlc_diffutil_result_flag

enum vlc_diffutil_result_flag

Enumerator
VLC_DIFFUTIL_RESULT_MOVE	try to transform an insertion with a matching suppression into a move operation
VLC_DIFFUTIL_RESULT_AGGREGATE	aggregate similar consecutive operations into a single operation for instance this: [{INSERT, i=5}{INSERT, x=6}{REMOVE, i=10}{REMOVE, i=10}{REMOVE, i=10}] would be transformed into: [{INSERT, i=5, count=2}{REMOVE, i=10, count=3}]

Function Documentation

vlc_diffutil_build_change_list()

vlc_diffutil_changelist_t * vlc_diffutil_build_change_list	(	const struct diffutil_snake_t *	snake,
		const vlc_diffutil_callback_t *	diffOp,
		const void *	dataOld,
		const void *	dataNew,
		int	flags
	)

vlc_diffutil_build_change_list creates a list of changes to apply to transform dataOld into dataNew

Parameters

snake	the snake created with vlc_diffutil_build_snake
diffOp	callbacks used in vlc_diffutil_build_snake
dataOld	old model
dataNew	new model
flags	vlc_diffutil_result_flag flags

Returns

the list of changes, NULL on error

vlc_diffutil_build_snake()

struct diffutil_snake_t * vlc_diffutil_build_snake	(	const vlc_diffutil_callback_t *	diffOp,
		const void *	dataOld,
		const void *	dataNew
	)

vlc_diffutil_build_snake compute a diff model between the dataOld model and the dataNew model.

This model can be processed manually using vlc_diffutil_walk_snake or translated into a change list using vlc_diffutil_build_change_list

Parameters

diffOp	callback to compare the elements from the old and new model
dataOld	old model
dataNew	new model

Returns

the diff model, NULL on error

References diffutil_context_t::backward, diffutil_context_t::dataNew, diffutil_context_t::dataOld, DiffUtilFindPath(), diffutil_context_t::forward, vlc_diffutil_callback_t::getNewSize, vlc_diffutil_callback_t::getOldSize, vlc_diffutil_callback_t::isSame, diffutil_context_t::op, vlc_vector_init, and diffutil_context_t::z.

vlc_diffutil_free_change_list()

void vlc_diffutil_free_change_list

(

vlc_diffutil_changelist_t *

changelist

)

free the changelist created by vlc_diffutil_build_change_list

References vlc_vector_destroy.

vlc_diffutil_free_snake()

void vlc_diffutil_free_snake

(

struct diffutil_snake_t *

snake

)

free the snake created by vlc_diffutil_build_snake

References vlc_vector_destroy.

vlc_diffutil_walk_snake()

bool vlc_diffutil_walk_snake	(	const diffutil_snake_t *	snake,
		const vlc_diffutil_snake_callback_t *	snakeOp,
		void *	cbData,
		const vlc_diffutil_callback_t *	diffOp,
		const void *	dataOld,
		const void *	dataNew
	)

iterate over the changelist and callback user on each operation (keep/insert/remove)

Parameters

snake	the snake created with vlc_diffutil_build_snake
snakeOp	snake callback
cbData	user data for snake callbacks
diffOp	callbacks used in vlc_diffutil_build_snake
dataOld	old model
dataNew	new model

Returns

false on error

Warning

dataOld and dataNew should not be altered during the operation

References diffutil_snake_t::data, vlc_diffutil_snake_callback_t::equal, vlc_diffutil_snake_callback_t::insert, vlc_diffutil_snake_callback_t::remove, diffutil_snake_t::size, diffutil_snakepoint_t::x, and diffutil_snakepoint_t::y.

Referenced by vlc_diffutil_build_change_list().