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* The Apache Software License, Version 1.1
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* Copyright (c) 1999-2002 The Apache Software Foundation. All rights
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* 3. The end-user documentation included with the redistribution,
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* if any, must include the following acknowledgment:
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* "This product includes software developed by the
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* Apache Software Foundation (http://www.apache.org/)."
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* Alternately, this acknowledgment may appear in the software itself,
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* if and wherever such third-party acknowledgments normally appear.
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* 4. The names "Xerces" and "Apache Software Foundation" must
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* not be used to endorse or promote products derived from this
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* software without prior written permission. For written
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* permission, please contact apache@apache.org.
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* 5. Products derived from this software may not be called "Apache",
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* nor may "Apache" appear in their name, without prior written
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* permission of the Apache Software Foundation.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* ====================================================================
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation and was
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* originally based on software copyright (c) 1999, International
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* Business Machines, Inc., http://www.apache.org. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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package org.apache.xerces.impl.dv.util;
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* This class encodes/decodes hexadecimal data
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* @author Jeffrey Rodriguez
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* @version $Id: HexBin.java,v 1.8 2003/05/08 20:11:55 elena Exp $
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public final class HexBin {
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static private final int BASELENGTH = 255;
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static private final int LOOKUPLENGTH = 16;
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static final private byte [] hexNumberTable = new byte[BASELENGTH];
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static final private char [] lookUpHexAlphabet = new char[LOOKUPLENGTH];
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for (int i = 0; i<BASELENGTH; i++ ) {
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hexNumberTable[i] = -1;
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for ( int i = '9'; i >= '0'; i--) {
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hexNumberTable[i] = (byte) (i-'0');
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for ( int i = 'F'; i>= 'A'; i--) {
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hexNumberTable[i] = (byte) ( i-'A' + 10 );
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for ( int i = 'f'; i>= 'a'; i--) {
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hexNumberTable[i] = (byte) ( i-'a' + 10 );
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for(int i = 0; i<10; i++ )
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lookUpHexAlphabet[i] = (char)('0'+i);
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for(int i = 10; i<=15; i++ )
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lookUpHexAlphabet[i] = (char)('A'+i -10);
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* Encode a byte array to hex string
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* @param binaryData array of byte to encode
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* @return return encoded string
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static public String encode(byte[] binaryData) {
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if (binaryData == null)
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int lengthData = binaryData.length;
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int lengthEncode = lengthData * 2;
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char[] encodedData = new char[lengthEncode];
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for (int i = 0; i < lengthData; i++) {
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temp = binaryData[i];
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encodedData[i*2] = lookUpHexAlphabet[temp >> 4];
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encodedData[i*2+1] = lookUpHexAlphabet[temp & 0xf];
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return new String(encodedData);
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* Decode hex string to a byte array
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* @param binaryData encoded string
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* @return return array of byte to encode
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static public byte[] decode(String encoded) {
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int lengthData = encoded.length();
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if (lengthData % 2 != 0)
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char[] binaryData = encoded.toCharArray();
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int lengthDecode = lengthData / 2;
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byte[] decodedData = new byte[lengthDecode];
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for( int i = 0; i<lengthDecode; i++ ){
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temp1 = hexNumberTable[binaryData[i*2]];
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temp2 = hexNumberTable[binaryData[i*2+1]];
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decodedData[i] = (byte)((temp1 << 4) | temp2);