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/***************************************************************************
* *
* 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 1.1 of pwmanager
* and was modified to run on embedded devices that run microkde
*
* $Id$
**************************************************************************/
#ifndef __RANDOMIZER_H
#define __RANDOMIZER_H
#include "pwmexception.h"
#ifndef PWM_EMBEDDED
#include <qmutex.h>
#endif
#include <string>
using std::string;
class QFile;
/** Randomizer to get random values.
* This class is thread-safe.
* You should always use the instance returned by
* obj() to use it.
*/
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 a random unsigned int */
unsigned int genRndUInt();
/** returns a buffer with random data */
string genRndBuf(size_t len);
/** returns a buffer with random data */
void genRndBuf(unsigned char *buf, size_t len);
protected:
/** random-device-node (if available. Otherwise NULL) */
QFile *rndDev;
#ifndef PWM_EMBEDDED
/** mutex for accessing the public functions thread-save */
QMutex mutex;
#endif
/** seed value for fallback - rand_r() */
unsigned int seed;
/** static Randomizer object returned by obj() */
static Randomizer *rndObj;
};
#endif // __RANDOMIZER_H
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