/***************************************************************************
 *                                                                         *
 *   copyright (C) 2003, 2004 by Michael Buesch                            *
 *   email: mbuesch@freenet.de                                             *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License version 2        *
 *   as published by the Free Software Foundation.                         *
 *                                                                         *
 ***************************************************************************/

/***************************************************************************
 * copyright (C) 2004 by Ulf Schenk
 * This file is originaly based on version 1.0.1 of pwmanager
 * and was modified to run on embedded devices that run microkde
 *
 * $Id$
 **************************************************************************/  

#ifndef RANDOMIZER_H
#define RANDOMIZER_H

#include "pwmexception.h"

#include <stdio.h>

/** simple randomizer 
  * This class is *NOT* reentrant save!
  */
class Randomizer
{
public:
	Randomizer();
	~Randomizer();

	static Randomizer * obj()
		{
			PWM_ASSERT(rndObj);
			return rndObj;
		}
	static void init()
		{
			PWM_ASSERT(!rndObj);
			rndObj = new Randomizer;
		}
	static void cleanup()
		{
			delete_ifnot_null(rndObj);
		}

	/** generate random char */
	char genRndChar();
	/** generate random int */
	int genRndInt();
	/** generate random unsigned int */
	unsigned int genRndUInt();

protected:
	/** random-device-node (if available. Otherwise NULL) */
	FILE *rndDev;
	/** seed value for fallback - rand_r() */
	unsigned int seed;
	/** static Randomier object returned by obj() */
	static Randomizer *rndObj;
};

#endif