| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 org.apache.tomcat.util.buf; |
| |
| /** |
| * Tables useful when converting byte arrays to and from strings of hexadecimal |
| * digits. |
| * Code from Ajp11, from Apache's JServ. |
| * |
| * @author Craig R. McClanahan |
| */ |
| |
| public final class HexUtils { |
| |
| |
| // -------------------------------------------------------------- Constants |
| |
| |
| /** |
| * Table for HEX to DEC byte translation. |
| */ |
| private static final int[] DEC = { |
| -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 00, 01, 02, 03, 04, 05, 06, 07, 8, 9, -1, -1, -1, -1, -1, -1, |
| -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| }; |
| |
| |
| /** |
| * Table for DEC to HEX byte translation. |
| */ |
| private static final byte[] HEX = |
| { (byte) '0', (byte) '1', (byte) '2', (byte) '3', (byte) '4', (byte) '5', |
| (byte) '6', (byte) '7', (byte) '8', (byte) '9', (byte) 'a', (byte) 'b', |
| (byte) 'c', (byte) 'd', (byte) 'e', (byte) 'f' }; |
| |
| |
| /** |
| * Table for byte to hex string translation. |
| */ |
| private static final char[] hex = "0123456789abcdef".toCharArray(); |
| |
| // --------------------------------------------------------- Static Methods |
| |
| |
| /** |
| * Provide a mechanism for ensuring this class is loaded. |
| */ |
| public static void load() { |
| // Nothing to do |
| } |
| |
| public static int getDec(int index){ |
| return DEC[index]; |
| } |
| |
| public static byte getHex(int index){ |
| return HEX[index]; |
| } |
| |
| public static String toHexString(byte[] bytes) |
| { |
| if(null == bytes) return null; |
| |
| StringBuilder sb = new StringBuilder(bytes.length << 1); |
| |
| for(int i=0; i<bytes.length; ++i) |
| sb.append(hex[(bytes[i] & 0xf0) >> 4]) |
| .append(hex[(bytes[i] & 0x0f)]) |
| ; |
| |
| return sb.toString(); |
| } |
| } |