| /* |
| * Copyright (c) 2007, 2011, 2012 Eike Stepper (Berlin, Germany) and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * Eike Stepper - initial API and implementation |
| */ |
| package org.eclipse.net4j.util.io; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| /** |
| * @author Eike Stepper |
| */ |
| public class XORInputStream extends DelegatingInputStream |
| { |
| private int[] key; |
| |
| private int index; |
| |
| public XORInputStream(InputStream in, int... key) |
| { |
| super(in); |
| this.key = key; |
| } |
| |
| public int[] getKey() |
| { |
| return key; |
| } |
| |
| @Override |
| public int read() throws IOException |
| { |
| int b = super.read(); |
| if (b != -1) |
| { |
| if (key != null && key.length != 0) |
| { |
| if (index == key.length) |
| { |
| index = 0; |
| } |
| |
| b = b & 0xFF ^ key[index++] & 0xFF; |
| } |
| } |
| |
| return b; |
| } |
| } |