/*
 * reserved comment block
 * DO NOT REMOVE OR ALTER!
 */
/*
 * Copyright  1999-2005 The Apache Software Foundation.
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 */
package com.sun.org.apache.xml.internal.security.utils;

import java.io.OutputStream;

/**
 * A simple Unsynced ByteArryOutputStream
 * @author raul
 *
 */
public class UnsyncByteArrayOutputStream extends OutputStream  {
        private static ThreadLocal bufCahce = new ThreadLocal() {
        protected synchronized Object initialValue() {
            return new byte[8*1024];
        }
    };
    byte[] buf;
        int size=8*1024;//buf.length;
        int pos=0;
        public UnsyncByteArrayOutputStream() {
                buf=(byte[])bufCahce.get();
        }
        /** @inheritDoc */
        public void write(byte[] arg0) {
                int newPos=pos+arg0.length;
                if (newPos>size) {
                        expandSize();
                }
                System.arraycopy(arg0,0,buf,pos,arg0.length);
                pos=newPos;
        }
        /** @inheritDoc */
        public void write(byte[] arg0, int arg1, int arg2) {
                int newPos=pos+arg2;
                if (newPos>size) {
                        expandSize();
                }
                System.arraycopy(arg0,arg1,buf,pos,arg2);
                pos=newPos;
        }
        /** @inheritDoc */
        public void write(int arg0) {
                if (pos>=size) {
                        expandSize();
                }
                buf[pos++]=(byte)arg0;
        }
        /** @inheritDoc */
        public byte[] toByteArray() {
                byte result[]=new byte[pos];
                System.arraycopy(buf,0,result,0,pos);
                return result;
        }

        /** @inheritDoc */
        public void reset() {
                pos=0;
        }

        /** @inheritDoc */
        void expandSize() {
                int newSize=size<<2;
                byte newBuf[]=new byte[newSize];
                System.arraycopy(buf,0,newBuf,0,pos);
                buf=newBuf;
                size=newSize;

        }
}
