FixedMaskGen.java

/*******************************************************************************
 * Copyright (c) 2011 Intalio, Inc.
 * ======================================================================
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * and Apache License v2.0 which accompanies this distribution.
 *
 *   The Eclipse Public License is available at
 *   http://www.eclipse.org/legal/epl-v10.html
 *
 *   The Apache License v2.0 is available at
 *   http://www.opensource.org/licenses/apache2.0.php
 *
 * You may elect to redistribute this code under either of these licenses.
 *******************************************************************************/
package org.eclipse.jetty.websocket;


public class FixedMaskGen implements MaskGen
{
    private final byte[] _mask;

    public FixedMaskGen()
    {
        this(new byte[]{(byte)0xff,(byte)0xff,(byte)0xff,(byte)0xff});
    }

    public FixedMaskGen(byte[] mask)
    {
        _mask=new byte[4];
        // Copy to avoid that external code keeps a reference
        // to the array parameter to modify masking on-the-fly
        System.arraycopy(mask, 0, _mask, 0, 4);
    }

    public void genMask(byte[] mask)
    {
        System.arraycopy(_mask, 0, mask, 0, 4);
    }
}