1 /*
   2  * reserved comment block
   3  * DO NOT REMOVE OR ALTER!
   4  */
   5 /*
   6  * Copyright 1999-2010 The Apache Software Foundation.
   7  *
   8  *  Licensed under the Apache License, Version 2.0 (the "License");
   9  *  you may not use this file except in compliance with the License.
  10  *  You may obtain a copy of the License at


  11  *
  12  *      http://www.apache.org/licenses/LICENSE-2.0
  13  *
  14  *  Unless required by applicable law or agreed to in writing, software
  15  *  distributed under the License is distributed on an "AS IS" BASIS,
  16  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  17  *  See the License for the specific language governing permissions and
  18  *  limitations under the License.
  19  *
  20  */
  21 package com.sun.org.apache.xml.internal.security.utils;
  22 
  23 import java.io.OutputStream;
  24 
  25 /**
  26  * A simple Unsynced ByteArrayOutputStream
  27  * @author raul
  28  *
  29  */
  30 public class UnsyncByteArrayOutputStream extends OutputStream  {

  31     private static final int INITIAL_SIZE = 8192;
  32     private static ThreadLocal<byte[]> bufCache = new ThreadLocal<byte[]>() {
  33         protected synchronized byte[] initialValue() {
  34             return new byte[INITIAL_SIZE];
  35         }
  36     };
  37 
  38     private byte[] buf;
  39     private int size = INITIAL_SIZE;
  40     private int pos = 0;
  41 
  42     public UnsyncByteArrayOutputStream() {
  43         buf = bufCache.get();
  44     }
  45 
  46     public void write(byte[] arg0) {



  47         int newPos = pos + arg0.length;
  48         if (newPos > size) {
  49             expandSize(newPos);
  50         }
  51         System.arraycopy(arg0, 0, buf, pos, arg0.length);
  52         pos = newPos;
  53     }
  54 
  55     public void write(byte[] arg0, int arg1, int arg2) {



  56         int newPos = pos + arg2;
  57         if (newPos > size) {
  58             expandSize(newPos);
  59         }
  60         System.arraycopy(arg0, arg1, buf, pos, arg2);
  61         pos = newPos;
  62     }
  63 
  64     public void write(int arg0) {



  65         int newPos = pos + 1;
  66         if (newPos > size) {
  67             expandSize(newPos);
  68         }
  69         buf[pos++] = (byte)arg0;
  70     }
  71 
  72     public byte[] toByteArray() {
  73         byte result[] = new byte[pos];
  74         System.arraycopy(buf, 0, result, 0, pos);
  75         return result;
  76     }
  77 
  78     public void reset() {
  79         pos = 0;
  80     }
  81 
  82     private void expandSize(int newPos) {
  83         int newSize = size;
  84         while (newPos > newSize) {
  85             newSize = newSize<<2;




  86         }
  87         byte newBuf[] = new byte[newSize];
  88         System.arraycopy(buf, 0, newBuf, 0, pos);
  89         buf = newBuf;
  90         size = newSize;
  91     }
  92 }

   1 /*
   2  * reserved comment block
   3  * DO NOT REMOVE OR ALTER!
   4  */
   5 /**
   6  * Licensed to the Apache Software Foundation (ASF) under one
   7  * or more contributor license agreements. See the NOTICE file
   8  * distributed with this work for additional information
   9  * regarding copyright ownership. The ASF licenses this file
  10  * to you under the Apache License, Version 2.0 (the
  11  * "License"); you may not use this file except in compliance
  12  * with the License. You may obtain a copy of the License at
  13  *
  14  * http://www.apache.org/licenses/LICENSE-2.0
  15  *
  16  * Unless required by applicable law or agreed to in writing,
  17  * software distributed under the License is distributed on an
  18  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  19  * KIND, either express or implied. See the License for the
  20  * specific language governing permissions and limitations
  21  * under the License.
  22  */
  23 package com.sun.org.apache.xml.internal.security.utils;
  24 
  25 import java.io.OutputStream;
  26 
  27 /**
  28  * A simple Unsynced ByteArrayOutputStream
  29  * @author raul
  30  *
  31  */
  32 public class UnsyncByteArrayOutputStream extends OutputStream  {        
  33 
  34     private static final int INITIAL_SIZE = 8192;





  35 
  36     private byte[] buf;
  37     private int size = INITIAL_SIZE;
  38     private int pos = 0;
  39 
  40     public UnsyncByteArrayOutputStream() {
  41         buf = new byte[INITIAL_SIZE];
  42     }
  43 
  44     public void write(byte[] arg0) {
  45         if ((Integer.MAX_VALUE - pos) < arg0.length) {
  46             throw new OutOfMemoryError();
  47         }
  48         int newPos = pos + arg0.length;
  49         if (newPos > size) {
  50             expandSize(newPos);
  51         }
  52         System.arraycopy(arg0, 0, buf, pos, arg0.length);
  53         pos = newPos;
  54     }
  55 
  56     public void write(byte[] arg0, int arg1, int arg2) {
  57         if ((Integer.MAX_VALUE - pos) < arg2) {
  58             throw new OutOfMemoryError();
  59         }
  60         int newPos = pos + arg2;
  61         if (newPos > size) {
  62             expandSize(newPos);
  63         }
  64         System.arraycopy(arg0, arg1, buf, pos, arg2);
  65         pos = newPos;
  66     }
  67 
  68     public void write(int arg0) {
  69         if ((Integer.MAX_VALUE - pos) == 0) {
  70             throw new OutOfMemoryError();
  71         }
  72         int newPos = pos + 1;
  73         if (newPos > size) {
  74             expandSize(newPos);
  75         }
  76         buf[pos++] = (byte)arg0;                
  77     }
  78 
  79     public byte[] toByteArray() {
  80         byte result[] = new byte[pos];
  81         System.arraycopy(buf, 0, result, 0, pos);
  82         return result;
  83     }
  84 
  85     public void reset() {
  86         pos = 0;
  87     }
  88     
  89     private void expandSize(int newPos) {
  90         int newSize = size;
  91         while (newPos > newSize) {
  92             newSize = newSize << 1;
  93             // Deal with overflow
  94             if (newSize < 0) {
  95                 newSize = Integer.MAX_VALUE;
  96             }
  97         }
  98         byte newBuf[] = new byte[newSize];
  99         System.arraycopy(buf, 0, newBuf, 0, pos);
 100         buf = newBuf;
 101         size = newSize;
 102     }
 103 }