dummy.java

解决了nat穿越的问题

/*
 * This file is part of JSTUN. 
 * 
 * Copyright (c) 2005 Thomas King <[e-mail]> - All rights
 * reserved.
 * 
 * This software is licensed under either the GNU Public License (GPL),
 * or the Apache 2.0 license. Copies of both license agreements are
 * included in this distribution.
 */

package de.javawi.jstun.attribute;

import de.javawi.jstun.util.Utility;
import de.javawi.jstun.util.UtilityException;

public class Dummy extends MessageAttribute {
	int lengthValue;
	public Dummy() {
		super(MessageAttributeType.Dummy);
	}
	
	public void setLengthValue(int length) {
		this.lengthValue = length;
	}

	public byte[] getBytes() throws UtilityException {
		byte[] result = new byte[lengthValue + 4];
		//	message attribute header
		// type
		System.arraycopy(Utility.IntegerToTwoBytes(typeToInteger(type)), 0, result, 0, 2);
		// length
		System.arraycopy(Utility.IntegerToTwoBytes(lengthValue), 0, result, 2, 2);
		return result;
	}
	
	public static Dummy parse(byte[] data) {
		Dummy dummy = new Dummy();
		dummy.setLengthValue(data.length);
		return dummy;
	}
}