/*
* Copyright 2008-2016 the original author or authors.
*
* 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 com.nominanuda.zen.codec;
public class Hex {
private static final char[] ALPHABET = new char[]
{'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
/**
*
* @param barr
* @return the hex string uppercase
*/
public static String encode(byte[] barr) {
char[] result = new char[barr.length * 2];
for (int i = 0; i < barr.length; i++) {
int v = barr[i] & 0xFF;
result[i * 2] = ALPHABET[v >>> 4];
result[i * 2 + 1] = ALPHABET[v & 0x0F];
}
return new String(result);
}
public static byte[] decode(String hex) {
int len = hex.length();
byte[] bytes = new byte[len / 2];
for (int i = 0; i < len; i += 2) {
bytes[i / 2] = (byte) ((Character.digit(hex.charAt(i), 16) << 4) + Character.digit(hex.charAt(i+1), 16));
}
return bytes;
}
}