| /* |
| * The Apache Software License, Version 1.1 |
| * |
| * |
| * Copyright (c) 1999 The Apache Software Foundation. All rights |
| * reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3. The end-user documentation included with the redistribution, |
| * if any, must include the following acknowledgment: |
| * "This product includes software developed by the |
| * Apache Software Foundation (http://www.apache.org/)." |
| * Alternately, this acknowledgment may appear in the software itself, |
| * if and wherever such third-party acknowledgments normally appear. |
| * |
| * 4. The names "Xerces" and "Apache Software Foundation" must |
| * not be used to endorse or promote products derived from this |
| * software without prior written permission. For written |
| * permission, please contact apache@apache.org. |
| * |
| * 5. Products derived from this software may not be called "Apache", |
| * nor may "Apache" appear in their name, without prior written |
| * permission of the Apache Software Foundation. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation and was |
| * originally based on software copyright (c) 1999, International |
| * Business Machines, Inc., http://www.apache.org. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| */ |
| |
| package org.apache.xerces.utils; |
| |
| import java.lang.*; |
| |
| |
| /** |
| * format validation |
| * |
| * This class encodes/decodes hexadecimal data |
| * @author Jeffrey Rodriguez |
| * @version $Id$ |
| */ |
| |
| public final class HexBin { |
| static private final int BASELENGTH = 255; |
| static private final int LOOKUPLENGTH = 16; |
| static private byte [] hexNumberTable = new byte[BASELENGTH]; |
| static private byte [] lookUpHexAlphabet = new byte[LOOKUPLENGTH]; |
| |
| |
| static { |
| for (int i = 0; i<BASELENGTH; i++ ) { |
| hexNumberTable[i] = -1; |
| } |
| for ( int i = '9'; i >= '0'; i--) { |
| hexNumberTable[i] = (byte) (i-'0'); |
| } |
| for ( int i = 'F'; i>= 'A'; i--) { |
| hexNumberTable[i] = (byte) ( i-'A' + 10 ); |
| } |
| for ( int i = 'f'; i>= 'a'; i--) { |
| hexNumberTable[i] = (byte) ( i-'a' + 10 ); |
| } |
| for(int i = 0; i<=25; i++ ) |
| lookUpHexAlphabet[i] = (byte) ('A'+i ); |
| |
| for(int i = 0; i<10; i++ ) |
| lookUpHexAlphabet[i] = (byte) ('0'+i ); |
| for(int i = 10; i<=15; i++ ) |
| lookUpHexAlphabet[i] = (byte) ('A'+i -10); |
| } |
| |
| /** |
| * byte to be tested if it is Base64 alphabet |
| * |
| * @param octect |
| * @return |
| */ |
| static boolean isHex( byte octect ) { |
| //shall we ignore white space? JEFF?? |
| return(hexNumberTable[octect] != -1 ); |
| } |
| |
| |
| /** |
| * Array of bytes to check against Hex Table |
| * |
| * @param arrayOctect |
| * @return |
| */ |
| static boolean isArrayByteHex( byte[] arrayOctect ) { |
| int length = arrayOctect.length; |
| if( length == 0 ) |
| return false; |
| for( int i=0; i < length; i++ ){ |
| |
| if( HexBin.isHex( arrayOctect[i] ) == false) |
| return false; |
| |
| } |
| return true; |
| } |
| |
| public static boolean isHex( String isValidString ){ |
| return( isArrayByteHex( isValidString.getBytes())); |
| } |
| |
| |
| |
| /** |
| * array of byte to encode |
| * |
| * @param binaryData |
| * @return return encode binary array |
| */ |
| static public byte[] encode( byte[] binaryData ) { |
| int lengthData = binaryData.length; |
| int lengthEncode = lengthData; |
| byte[] encodedData = new byte[lengthData]; |
| for( int i = 0; i<lengthData; i++ ){ |
| encodedData[i] = lookUpHexAlphabet[ binaryData[i] ]; |
| } |
| return encodedData; |
| } |
| |
| |
| static public byte[] decode ( byte[] binaryData ) { |
| int lengthData = binaryData.length; |
| int lengthEncode = lengthData; |
| byte[] decodedData = new byte[lengthData]; |
| for( int i = 0; i<lengthData; i++ ){ |
| decodedData[i] = hexNumberTable[binaryData[i]]; |
| } |
| return decodedData; |
| } |
| } |