1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 /* 19 Extracted from commons-codec 20 */ 21 package com.coremedia.iso; 22 23 import java.io.ByteArrayOutputStream; 24 25 /** 26 * Converts hexadecimal Strings. 27 */ 28 public class Hex { 29 private static final char[] DIGITS = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'}; 30 31 public static String encodeHex(byte[] data) { 32 return encodeHex(data, 0); 33 } 34 35 public static String encodeHex(byte[] data, int group) { 36 int l = data.length; 37 char[] out = new char[(l << 1) + (group > 0 ? (l / group) : 0)]; 38 // two characters form the hex value. 39 for (int i = 0, j = 0; i < l; i++) { 40 if ((group > 0) && ((i % group) == 0) && j > 0) { 41 out[j++] = '-'; 42 } 43 44 out[j++] = DIGITS[(0xF0 & data[i]) >>> 4]; 45 out[j++] = DIGITS[0x0F & data[i]]; 46 } 47 return new String(out); 48 } 49 50 public static byte[] decodeHex(String hexString) { 51 ByteArrayOutputStream bas = new ByteArrayOutputStream(); 52 for (int i = 0; i < hexString.length(); i += 2) { 53 int b = Integer.parseInt(hexString.substring(i, i + 2), 16); 54 bas.write(b); 55 } 56 return bas.toByteArray(); 57 } 58 } 59
