state-object.h

#ifndef _dryos_state_object_h_
#define _dryos_state_object_h_

/** \file
 * DryOS finite-state machine objects.
 */
/*
 * Copyright (C) 2009 Trammell Hudson <hudson+ml@osresearch.net>
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the
 * Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor,
 * Boston, MA  02110-1301, USA.
 */


#include "arm-mcr.h"

/** State objects.
 *
 * Size 0x20
 */
typedef struct state_object * (*state_function_t)(
	void *			arg1,
	void *			arg2,
	void *			arg3
);

struct state_callback
{
	uint32_t		next_state;
	state_function_t	handler;
};


struct state_object
{
	const char *		type;		// off 0x00, "StateObject" 
	const char *		name;		// off 0x04, arg 0
	uint32_t		auto_sequence;	// off 0x08, arg 1

	// off 0x0c, always 0xff99a228 ?
	void			(*callback)(
		struct state_object *	self,
		void *			arg1,
		uint32_t		input,
		void *			arg3,
		void *			arg4
	);

	// Points to an array of size [max_inputs][max_states]
	struct state_callback *	callbacks;	// off 0x10
	uint32_t		max_inputs;	// off 0x14, arg 2
	uint32_t		max_states;	// off 0x18, arg 3
	uint32_t		state;		// off 0x1c, initially 0
};

SIZE_CHECK_STRUCT( state_object, 0x20 );


extern struct state_object *
state_object_create(
	const char *		name,
	int			auto_sequence,
	state_function_t *	callbacks,
	int			max_inputs,
	int			max_states
);


extern void
state_object_dispatchc(
	struct state_object *	self,
	int			input,
	int			arg0,
	int			arg1,
	int			arg2
);


#endif