l2j-server-game/java/com/l2jserver/util/network/BaseRecievePacket.java

/*
 * Copyright (C) 2004-2015 L2J Server
 * 
 * This file is part of L2J Server.
 * 
 * L2J Server 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 3 of the License, or
 * (at your option) any later version.
 * 
 * L2J Server 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, see <http://www.gnu.org/licenses/>.
 */
package com.l2jserver.util.network;

import java.util.logging.Logger;

/**
 * This class ...
 * @version $Revision: 1.2.4.1 $ $Date: 2005/03/27 15:30:12 $
 */
public abstract class BaseRecievePacket
{
	private static final Logger _log = Logger.getLogger(BaseRecievePacket.class.getName());
	
	private final byte[] _decrypt;
	private int _off;
	
	public BaseRecievePacket(byte[] decrypt)
	{
		_decrypt = decrypt;
		_off = 1; // skip packet type id
	}
	
	public int readD()
	{
		int result = _decrypt[_off++] & 0xff;
		result |= (_decrypt[_off++] << 8) & 0xff00;
		result |= (_decrypt[_off++] << 0x10) & 0xff0000;
		result |= (_decrypt[_off++] << 0x18) & 0xff000000;
		return result;
	}
	
	public int readC()
	{
		int result = _decrypt[_off++] & 0xff;
		return result;
	}
	
	public int readH()
	{
		int result = _decrypt[_off++] & 0xff;
		result |= (_decrypt[_off++] << 8) & 0xff00;
		return result;
	}
	
	public double readF()
	{
		long result = _decrypt[_off++] & 0xff;
		result |= (_decrypt[_off++] & 0xffL) << 8L;
		result |= (_decrypt[_off++] & 0xffL) << 16L;
		result |= (_decrypt[_off++] & 0xffL) << 24L;
		result |= (_decrypt[_off++] & 0xffL) << 32L;
		result |= (_decrypt[_off++] & 0xffL) << 40L;
		result |= (_decrypt[_off++] & 0xffL) << 48L;
		result |= (_decrypt[_off++] & 0xffL) << 56L;
		return Double.longBitsToDouble(result);
	}
	
	public String readS()
	{
		String result = null;
		try
		{
			result = new String(_decrypt, _off, _decrypt.length - _off, "UTF-16LE");
			result = result.substring(0, result.indexOf(0x00));
			_off += (result.length() * 2) + 2;
		}
		catch (Exception e)
		{
			_log.warning(getClass().getSimpleName() + ": " + e.getMessage());
		}
		
		return result;
	}
	
	public final byte[] readB(int length)
	{
		byte[] result = new byte[length];
		System.arraycopy(_decrypt, _off, result, 0, length);
		_off += length;
		return result;
	}
	
	public long readQ()
	{
		long result = _decrypt[_off++] & 0xff;
		result |= (_decrypt[_off++] & 0xffL) << 8L;
		result |= (_decrypt[_off++] & 0xffL) << 16L;
		result |= (_decrypt[_off++] & 0xffL) << 24L;
		result |= (_decrypt[_off++] & 0xffL) << 32L;
		result |= (_decrypt[_off++] & 0xffL) << 40L;
		result |= (_decrypt[_off++] & 0xffL) << 48L;
		result |= (_decrypt[_off++] & 0xffL) << 56L;
		return result;
	}
}