/* ScummVM - Scumm Interpreter
 * Copyright (C) 2002-2003 The ScummVM project
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * $Header$
 */

#include "stdafx.h"
#include "base/engine.h"
#include "common/util.h"

namespace Common {

//
// Print hexdump of the data passed in
//
void hexdump(const byte * data, int len, int bytesPerLine) {
	assert(1 <= bytesPerLine && bytesPerLine <= 32);
	int i;
	byte c;
	int offset = 0;
	while (len >= bytesPerLine) {
		printf("%06x: ", offset);
		for (i = 0; i < bytesPerLine; i++) {
			printf("%02x ", data[i]);
			if (i % 4 == 3)
				printf(" ");
		}
		printf(" |");
		for (i = 0; i < bytesPerLine; i++) {
			c = data[i];
			if (c < 32 || c >= 127)
				c = '.';
			printf("%c", c);
		}
		printf("|\n");
		data += bytesPerLine;
		len -= bytesPerLine;
		offset += bytesPerLine;
	}

	if (len <= 0) 
		return;

	printf("%06x: ", offset);
	for (i = 0; i < len; i++) {
		printf("%02x ", data[i]);
		if (i % 4 == 3)
			printf(" ");
	}
	for (; i < bytesPerLine; i++)
		printf("   ");
	printf(" |");
	for (i = 0; i < len; i++) {
		c = data[i];
		if (c < 32 || c >= 127)
			c = '.';
		printf("%c", c);
	}
	for (; i < bytesPerLine; i++)
		printf(" ");
	printf("|\n");
}

RandomSource::RandomSource(uint32 seed) {
	_randSeed = seed;
}

void RandomSource::setSeed(uint32 seed) {
	_randSeed = seed;
}

uint RandomSource::getRandomNumber(uint max) {
	/* TODO: my own random number generator */
	_randSeed = 0xDEADBF03 * (_randSeed + 1);
	_randSeed = (_randSeed >> 13) | (_randSeed << 19);
	return _randSeed % (max + 1);
}

uint RandomSource::getRandomNumberRng(uint min, uint max) {
	return getRandomNumber(max - min) + min;
}

StackLock::StackLock(OSystem::MutexRef mutex, OSystem *syst)
	: _mutex(mutex), _syst(syst) {
	if (syst == 0)
		_syst = g_system;
	lock();
}

StackLock::~StackLock() {
	unlock();
}

void StackLock::lock() {
	assert(_syst);
	_syst->lock_mutex(_mutex);
}

void StackLock::unlock() {
	assert(_syst);
	_syst->unlock_mutex(_mutex);
}

}	// End of namespace Common