platform/platform-impl/src/com/intellij/util/ScrambledInputStream.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.InputStream;
  20
  21 public class ScrambledInputStream extends InputStream{
  22   private static final int MASK = ScrambledOutputStream.MASK;
  23   private final InputStream myOriginalStream;
  24
  25   public ScrambledInputStream(InputStream originalStream) {
  26     myOriginalStream = originalStream;
  27   }
  28
  29   public int read() throws IOException {
  30     int b = myOriginalStream.read();
  31     if (b == -1) return -1;
  32     return b ^ MASK;
  33   }
  34
  35   public int read(byte[] b, int off, int len) throws IOException {
  36     int read = myOriginalStream.read(b, off, len);
  37     for(int i = 0; i < read; i++){
  38       b[off + i] ^= MASK;
  39     }
  40     return read;
  41   }
  42
  43   public long skip(long n) throws IOException {
  44     return myOriginalStream.skip(n);
  45   }
  46
  47   public int available() throws IOException {
  48     return myOriginalStream.available();
  49   }
  50
  51   public void close() throws IOException {
  52     myOriginalStream.close();
  53   }
  54
  55   public synchronized void mark(int readlimit) {
  56     myOriginalStream.mark(readlimit);
  57   }
  58
  59   public synchronized void reset() throws IOException {
  60     myOriginalStream.reset();
  61   }
  62
  63   public boolean markSupported() {
  64     return myOriginalStream.markSupported();
  65   }
  66 }