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package com.sun.org.apache.xerces.internal.impl.dv.util;

format validation This class encodes/decodes hexadecimal data
Author:Jeffrey Rodriguez
@xerces.internal
/** * format validation * * This class encodes/decodes hexadecimal data * * @xerces.internal * * @author Jeffrey Rodriguez */
public final class HexBin { static private final int BASELENGTH = 128; static private final int LOOKUPLENGTH = 16; static final private byte [] hexNumberTable = new byte[BASELENGTH]; static final private char [] lookUpHexAlphabet = new char[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<10; i++ ) { lookUpHexAlphabet[i] = (char)('0'+i); } for(int i = 10; i<=15; i++ ) { lookUpHexAlphabet[i] = (char)('A'+i -10); } }
Encode a byte array to hex string
Params:
  • binaryData – array of byte to encode
Returns:return encoded string
/** * Encode a byte array to hex string * * @param binaryData array of byte to encode * @return return encoded string */
static public String encode(byte[] binaryData) { if (binaryData == null) return null; int lengthData = binaryData.length; int lengthEncode = lengthData * 2; char[] encodedData = new char[lengthEncode]; int temp; for (int i = 0; i < lengthData; i++) { temp = binaryData[i]; if (temp < 0) temp += 256; encodedData[i*2] = lookUpHexAlphabet[temp >> 4]; encodedData[i*2+1] = lookUpHexAlphabet[temp & 0xf]; } return new String(encodedData); }
Decode hex string to a byte array
Params:
  • encoded – encoded string
Returns:return array of byte to encode
/** * Decode hex string to a byte array * * @param encoded encoded string * @return return array of byte to encode */
static public byte[] decode(String encoded) { if (encoded == null) return null; int lengthData = encoded.length(); if (lengthData % 2 != 0) return null; char[] binaryData = encoded.toCharArray(); int lengthDecode = lengthData / 2; byte[] decodedData = new byte[lengthDecode]; byte temp1, temp2; char tempChar; for( int i = 0; i<lengthDecode; i++ ){ tempChar = binaryData[i*2]; temp1 = (tempChar < BASELENGTH) ? hexNumberTable[tempChar] : -1; if (temp1 == -1) return null; tempChar = binaryData[i*2+1]; temp2 = (tempChar < BASELENGTH) ? hexNumberTable[tempChar] : -1; if (temp2 == -1) return null; decodedData[i] = (byte)((temp1 << 4) | temp2); } return decodedData; } }