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);
      }
  }