File	Doc	Category	Size	Date	Package
HexBin.java	API Doc	Java SE 5 API	5472	Fri Aug 26 14:55:48 BST 2005	com.sun.org.apache.xerces.internal.impl.dv.util

HexBin

• java.lang.Object

Fields Summary
private static final int	BASELENGTH
private static final int	LOOKUPLENGTH
private static final byte[]	hexNumberTable
private static final char[]	lookUpHexAlphabet

Constructors Summary

Methods Summary
public static byte[]	decode(java.lang.String encoded) Decode hex string to a byte array param binaryData encoded string return return array of byte to encode 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; for( int i = 0; i<lengthDecode; i++ ){ temp1 = hexNumberTable[binaryData[i*2]]; if (temp1 == -1) return null; temp2 = hexNumberTable[binaryData[i*2+1]]; if (temp2 == -1) return null; decodedData[i] = (byte)((temp1 << 4) | temp2); } return decodedData;
public static java.lang.String	encode(byte[] binaryData) Encode a byte array to hex string param binaryData array of byte to encode return return encoded string 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); 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);