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The Apache Commons Codec package contains simple encoder and decoders for
various formats such as Base64 and Hexadecimal. In addition to these
widely used encoders and decoders, the codec package also maintains a
collection of phonetic encoding utilities.
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/* Copyright 2004 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 org.apache.xmlbeans.impl.util;
import java.io.UnsupportedEncodingException;
/**
* format validation
*
* This class encodes/decodes hexadecimal data
* @author Jeffrey Rodriguez
* @version $Id: HexBin.java 125124 2005-01-14 00:23:54Z kkrouse $
*/
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= '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<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) {
return (hexNumberTable[octect] != -1);
}
/**
* Converts bytes to a hex string
*/
static public String bytesToString(byte[] binaryData)
{
if (binaryData == null)
return null;
return new String(encode(binaryData));
}
/**
* Converts a hex string to a byte array.
*/
static public byte[] stringToBytes(String hexEncoded)
{
return decode(hexEncoded.getBytes());
}
/**
* array of byte to encode
*
* @param binaryData
* @return return encode binary array
*/
static public byte[] encode(byte[] binaryData) {
if (binaryData == null)
return null;
int lengthData = binaryData.length;
int lengthEncode = lengthData * 2;
byte[] encodedData = new byte[lengthEncode];
for( int i = 0; i> 4) & 0xf];
encodedData[i*2+1] = lookUpHexAlphabet[ binaryData[i] & 0xf];
}
return encodedData;
}
static public byte[] decode(byte[] binaryData) {
if (binaryData == null)
return null;
int lengthData = binaryData.length;
if (lengthData % 2 != 0)
return null;
int lengthDecode = lengthData / 2;
byte[] decodedData = new byte[lengthDecode];
for( int i = 0; i