| /* |
| * 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.activemq.openwire.utils; |
| |
| import org.apache.activemq.openwire.buffer.Buffer; |
| |
| /** |
| * Used to convert to hex from byte arrays and back. |
| */ |
| public final class HexSupport { |
| |
| private static final String[] HEX_TABLE = new String[]{ |
| "00", "01", "02", "03", "04", "05", "06", "07", "08", "09", "0a", "0b", "0c", "0d", "0e", "0f", |
| "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "1a", "1b", "1c", "1d", "1e", "1f", |
| "20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "2a", "2b", "2c", "2d", "2e", "2f", |
| "30", "31", "32", "33", "34", "35", "36", "37", "38", "39", "3a", "3b", "3c", "3d", "3e", "3f", |
| "40", "41", "42", "43", "44", "45", "46", "47", "48", "49", "4a", "4b", "4c", "4d", "4e", "4f", |
| "50", "51", "52", "53", "54", "55", "56", "57", "58", "59", "5a", "5b", "5c", "5d", "5e", "5f", |
| "60", "61", "62", "63", "64", "65", "66", "67", "68", "69", "6a", "6b", "6c", "6d", "6e", "6f", |
| "70", "71", "72", "73", "74", "75", "76", "77", "78", "79", "7a", "7b", "7c", "7d", "7e", "7f", |
| "80", "81", "82", "83", "84", "85", "86", "87", "88", "89", "8a", "8b", "8c", "8d", "8e", "8f", |
| "90", "91", "92", "93", "94", "95", "96", "97", "98", "99", "9a", "9b", "9c", "9d", "9e", "9f", |
| "a0", "a1", "a2", "a3", "a4", "a5", "a6", "a7", "a8", "a9", "aa", "ab", "ac", "ad", "ae", "af", |
| "b0", "b1", "b2", "b3", "b4", "b5", "b6", "b7", "b8", "b9", "ba", "bb", "bc", "bd", "be", "bf", |
| "c0", "c1", "c2", "c3", "c4", "c5", "c6", "c7", "c8", "c9", "ca", "cb", "cc", "cd", "ce", "cf", |
| "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", "d8", "d9", "da", "db", "dc", "dd", "de", "df", |
| "e0", "e1", "e2", "e3", "e4", "e5", "e6", "e7", "e8", "e9", "ea", "eb", "ec", "ed", "ee", "ef", |
| "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", "f8", "f9", "fa", "fb", "fc", "fd", "fe", "ff", |
| }; |
| |
| private static final int[] INT_OFFSETS = new int[]{ |
| 24,16,8,0 |
| }; |
| |
| private HexSupport() { |
| } |
| |
| /** |
| * Create a buffer from a previously encoded HEX String. |
| * |
| * @param hex |
| * the encoded string value of a buffer. |
| * |
| * @return a new Buffer instance with the decoded value. |
| */ |
| public static Buffer toBufferFromHex(String hex) { |
| byte rc[] = new byte[hex.length() / 2]; |
| |
| for (int i = 0; i < rc.length; i++) { |
| String h = hex.substring(i * 2, i * 2 + 2); |
| int x = Integer.parseInt(h, 16); |
| rc[i] = (byte) x; |
| } |
| |
| return new Buffer(rc); |
| } |
| |
| /** |
| * Return a new String instance that represents the input buffer |
| * encoded in Hexadecimal form. |
| * |
| * @param buffer |
| * The Buffer to encode. |
| * |
| * @return the contents of the Buffer encoded as Hexadecimal String. |
| */ |
| public static String toHexFromBuffer(Buffer buffer) { |
| byte[] data = buffer.data; |
| StringBuffer rc = new StringBuffer(buffer.length * 2); |
| int end = buffer.offset + buffer.length; |
| |
| for (int i = buffer.offset; i < end; i++) { |
| rc.append(HEX_TABLE[0xFF & data[i]]); |
| } |
| |
| return rc.toString(); |
| } |
| |
| /** |
| * Convert an Integer value into a string in Hexadecimal form. |
| * |
| * @param value |
| * The integer value to convert. |
| * @param trim |
| * True if the leading 0's should be trimmed off. |
| * |
| * @return a new String with the input value encoded as Hexadecimal. |
| */ |
| public static String toHexFromInt(int value, boolean trim) { |
| StringBuffer rc = new StringBuffer(INT_OFFSETS.length*2); |
| |
| for (int i = 0; i < INT_OFFSETS.length; i++) { |
| int b = 0xFF & (value>>INT_OFFSETS[i]); |
| if( !(trim && b == 0) ) { |
| rc.append(HEX_TABLE[b]); |
| trim=false; |
| } |
| } |
| |
| return rc.toString(); |
| } |
| } |