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• Base16.java

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ff.prac.util.encoding.Base16 Maven / Gradle / Ivy

/*
 * Copyright (C) 2015-2018 XinZhenfeng 
 * 
 * This file is part of prac
 * 
 * prac is free software: you can use, redistribute, and/or modify
 * it under the terms of the GNU Affero General Public License, version 3
 * or later ("AGPL"), as published by the Free Software Foundation.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see .
 */

package ff.prac.util.encoding;

public class Base16 {

	public static final String ENCODED_CHARSET = "US-ASCII";
	
	private static byte[] encodingTable = {
			'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 
			'A', 'B', 'C', 'D', 'E', 'F'};
	
	private static byte[] decodingTable = new byte[128];
	
	static {
		for(int i=0; i>> 4 ) & 0x0f;
			int i2 = by & 0x0f ;
			encoded.append( (char)(encodingTable[i1]) )
				.append( (char)(encodingTable[i2]) );
		}
		return encoded.toString();
	}
	
	public static byte[] decode(String encoded) {
		if(encoded==null || encoded.length()%2==1) {
			return null;
		}
		byte[] decoded = new byte[encoded.length()/2];
		
		for(int i=0; (i+1)