001 /** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 package org.apache.activemq.util; 018 019 /** 020 * Used to convert to hex from byte arrays and back. 021 * 022 * @version $Revision: 1.2 $ 023 */ 024 public final class HexSupport { 025 026 private static final String[] HEX_TABLE = new String[]{ 027 "00", "01", "02", "03", "04", "05", "06", "07", "08", "09", "0a", "0b", "0c", "0d", "0e", "0f", 028 "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "1a", "1b", "1c", "1d", "1e", "1f", 029 "20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "2a", "2b", "2c", "2d", "2e", "2f", 030 "30", "31", "32", "33", "34", "35", "36", "37", "38", "39", "3a", "3b", "3c", "3d", "3e", "3f", 031 "40", "41", "42", "43", "44", "45", "46", "47", "48", "49", "4a", "4b", "4c", "4d", "4e", "4f", 032 "50", "51", "52", "53", "54", "55", "56", "57", "58", "59", "5a", "5b", "5c", "5d", "5e", "5f", 033 "60", "61", "62", "63", "64", "65", "66", "67", "68", "69", "6a", "6b", "6c", "6d", "6e", "6f", 034 "70", "71", "72", "73", "74", "75", "76", "77", "78", "79", "7a", "7b", "7c", "7d", "7e", "7f", 035 "80", "81", "82", "83", "84", "85", "86", "87", "88", "89", "8a", "8b", "8c", "8d", "8e", "8f", 036 "90", "91", "92", "93", "94", "95", "96", "97", "98", "99", "9a", "9b", "9c", "9d", "9e", "9f", 037 "a0", "a1", "a2", "a3", "a4", "a5", "a6", "a7", "a8", "a9", "aa", "ab", "ac", "ad", "ae", "af", 038 "b0", "b1", "b2", "b3", "b4", "b5", "b6", "b7", "b8", "b9", "ba", "bb", "bc", "bd", "be", "bf", 039 "c0", "c1", "c2", "c3", "c4", "c5", "c6", "c7", "c8", "c9", "ca", "cb", "cc", "cd", "ce", "cf", 040 "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", "d8", "d9", "da", "db", "dc", "dd", "de", "df", 041 "e0", "e1", "e2", "e3", "e4", "e5", "e6", "e7", "e8", "e9", "ea", "eb", "ec", "ed", "ee", "ef", 042 "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", "f8", "f9", "fa", "fb", "fc", "fd", "fe", "ff", 043 }; 044 private static final int[] INT_OFFSETS = new int[]{ 045 24,16,8,0 046 }; 047 048 private HexSupport() { 049 } 050 051 /** 052 * @param hex 053 * @return 054 */ 055 public static byte[] toBytesFromHex(String hex) { 056 byte rc[] = new byte[hex.length() / 2]; 057 for (int i = 0; i < rc.length; i++) { 058 String h = hex.substring(i * 2, i * 2 + 2); 059 int x = Integer.parseInt(h, 16); 060 rc[i] = (byte) x; 061 } 062 return rc; 063 } 064 065 /** 066 * @param bytes 067 * @return 068 */ 069 public static String toHexFromBytes(byte[] bytes) { 070 StringBuffer rc = new StringBuffer(bytes.length * 2); 071 for (int i = 0; i < bytes.length; i++) { 072 rc.append(HEX_TABLE[0xFF & bytes[i]]); 073 } 074 return rc.toString(); 075 } 076 077 /** 078 * 079 * @param value 080 * @param trim if the leading 0's should be trimmed off. 081 * @return 082 */ 083 public static String toHexFromInt(int value, boolean trim) { 084 StringBuffer rc = new StringBuffer(INT_OFFSETS.length*2); 085 for (int i = 0; i < INT_OFFSETS.length; i++) { 086 int b = 0xFF & (value>>INT_OFFSETS[i]); 087 if( !(trim && b == 0) ) { 088 rc.append(HEX_TABLE[b]); 089 trim=false; 090 } 091 } 092 return rc.toString(); 093 } 094 095 }