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    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   package org.apache.kahadb.util;
   18   
   19   /**
   20    * Used to convert to hex from byte arrays and back.
   21    * 
   22    * @version $Revision: 712224 $
   23    */
   24   public final class HexSupport {
   25       
   26       private static final String[] HEX_TABLE = new String[]{
   27           "00", "01", "02", "03", "04", "05", "06", "07", "08", "09", "0a", "0b", "0c", "0d", "0e", "0f",
   28           "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "1a", "1b", "1c", "1d", "1e", "1f",
   29           "20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "2a", "2b", "2c", "2d", "2e", "2f",
   30           "30", "31", "32", "33", "34", "35", "36", "37", "38", "39", "3a", "3b", "3c", "3d", "3e", "3f",
   31           "40", "41", "42", "43", "44", "45", "46", "47", "48", "49", "4a", "4b", "4c", "4d", "4e", "4f",
   32           "50", "51", "52", "53", "54", "55", "56", "57", "58", "59", "5a", "5b", "5c", "5d", "5e", "5f",
   33           "60", "61", "62", "63", "64", "65", "66", "67", "68", "69", "6a", "6b", "6c", "6d", "6e", "6f",
   34           "70", "71", "72", "73", "74", "75", "76", "77", "78", "79", "7a", "7b", "7c", "7d", "7e", "7f",
   35           "80", "81", "82", "83", "84", "85", "86", "87", "88", "89", "8a", "8b", "8c", "8d", "8e", "8f",
   36           "90", "91", "92", "93", "94", "95", "96", "97", "98", "99", "9a", "9b", "9c", "9d", "9e", "9f",
   37           "a0", "a1", "a2", "a3", "a4", "a5", "a6", "a7", "a8", "a9", "aa", "ab", "ac", "ad", "ae", "af",
   38           "b0", "b1", "b2", "b3", "b4", "b5", "b6", "b7", "b8", "b9", "ba", "bb", "bc", "bd", "be", "bf",
   39           "c0", "c1", "c2", "c3", "c4", "c5", "c6", "c7", "c8", "c9", "ca", "cb", "cc", "cd", "ce", "cf",
   40           "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", "d8", "d9", "da", "db", "dc", "dd", "de", "df",
   41           "e0", "e1", "e2", "e3", "e4", "e5", "e6", "e7", "e8", "e9", "ea", "eb", "ec", "ed", "ee", "ef",
   42           "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", "f8", "f9", "fa", "fb", "fc", "fd", "fe", "ff",
   43       };
   44       private static final int[] INT_OFFSETS = new int[]{
   45       	24,16,8,0
   46       };
   47       
   48       private HexSupport() {
   49       }
   50       
   51       /**
   52        * @param hex
   53        * @return
   54        */
   55       public static byte[] toBytesFromHex(String hex) {
   56           byte rc[] = new byte[hex.length() / 2];
   57           for (int i = 0; i < rc.length; i++) {
   58               String h = hex.substring(i * 2, i * 2 + 2);
   59               int x = Integer.parseInt(h, 16);
   60               rc[i] = (byte) x;
   61           }
   62           return rc;
   63       }
   64   
   65       /**
   66        * @param bytes
   67        * @return
   68        */
   69       public static String toHexFromBytes(byte[] bytes) {
   70           StringBuffer rc = new StringBuffer(bytes.length * 2);
   71           for (int i = 0; i < bytes.length; i++) {
   72               rc.append(HEX_TABLE[0xFF & bytes[i]]);
   73           }
   74           return rc.toString();
   75       }
   76   
   77       /**
   78        * 
   79        * @param value 
   80        * @param trim if the leading 0's should be trimmed off.
   81        * @return
   82        */
   83       public static String toHexFromInt(int value, boolean trim) {
   84           StringBuffer rc = new StringBuffer(INT_OFFSETS.length*2);
   85           for (int i = 0; i < INT_OFFSETS.length; i++) {
   86           	int b = 0xFF & (value>>INT_OFFSETS[i]);
   87           	if( !(trim && b == 0) ) { 
   88           		rc.append(HEX_TABLE[b]);
   89           		trim=false;
   90           	}
   91           }
   92           return rc.toString();
   93       }
   94   
   95   }

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