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 }