platform/platform-impl/src/com/intellij/util/ScrambledOutputStream.java

   1 /*
   2  * Copyright 2000-2009 JetBrains s.r.o.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package com.intellij.util;
  17
  18 import java.io.IOException;
  19 import java.io.OutputStream;
  20
  21 public class ScrambledOutputStream extends OutputStream{
  22   static final int MASK = 0xAA;
  23   private final OutputStream myOriginalStream;
  24
  25   public ScrambledOutputStream(OutputStream originalStream) {
  26     myOriginalStream = originalStream;
  27   }
  28
  29   public void write(int b) throws IOException {
  30     myOriginalStream.write(b ^ MASK);
  31   }
  32
  33   public void write(byte[] b, int off, int len) throws IOException {
  34     byte[] newBytes = new byte[len];
  35     for(int i = 0; i < len; i++) {
  36       newBytes[i] = (byte)(b[off + i] ^ MASK);
  37     }
  38     myOriginalStream.write(newBytes, 0, len);
  39   }
  40
  41   public void flush() throws IOException {
  42     myOriginalStream.flush();
  43   }
  44
  45   public void close() throws IOException {
  46     myOriginalStream.close();
  47   }
  48
  49 }