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      1 /*
      2  * Copyright (C) 2006 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.google.polo.pairing;
     18 
     19 public class HexDump
     20 {
     21     private final static char[] HEX_DIGITS = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
     22 
     23     public static String dumpHexString(byte[] array)
     24     {
     25         return dumpHexString(array, 0, array.length);
     26     }
     27 
     28     public static String dumpHexString(byte[] array, int offset, int length)
     29     {
     30         StringBuilder result = new StringBuilder();
     31 
     32         byte[] line = new byte[16];
     33         int lineIndex = 0;
     34 
     35         result.append("\n0x");
     36         result.append(toHexString(offset));
     37 
     38         for (int i = offset ; i < offset + length ; i++)
     39         {
     40             if (lineIndex == 16)
     41             {
     42                 result.append(" ");
     43 
     44                 for (int j = 0 ; j < 16 ; j++)
     45                 {
     46                     if (line[j] > ' ' && line[j] < '~')
     47                     {
     48                         result.append(new String(line, j, 1));
     49                     }
     50                     else
     51                     {
     52                         result.append(".");
     53                     }
     54                 }
     55 
     56                 result.append("\n0x");
     57                 result.append(toHexString(i));
     58                 lineIndex = 0;
     59             }
     60 
     61             byte b = array[i];
     62             result.append(" ");
     63             result.append(HEX_DIGITS[(b >>> 4) & 0x0F]);
     64             result.append(HEX_DIGITS[b & 0x0F]);
     65 
     66             line[lineIndex++] = b;
     67         }
     68 
     69         if (lineIndex != 16)
     70         {
     71             int count = (16 - lineIndex) * 3;
     72             count++;
     73             for (int i = 0 ; i < count ; i++)
     74             {
     75                 result.append(" ");
     76             }
     77 
     78             for (int i = 0 ; i < lineIndex ; i++)
     79             {
     80                 if (line[i] > ' ' && line[i] < '~')
     81                 {
     82                     result.append(new String(line, i, 1));
     83                 }
     84                 else
     85                 {
     86                     result.append(".");
     87                 }
     88             }
     89         }
     90 
     91         return result.toString();
     92     }
     93 
     94     public static String toHexString(byte b)
     95     {
     96         return toHexString(toByteArray(b));
     97     }
     98 
     99     public static String toHexString(byte[] array)
    100     {
    101         return toHexString(array, 0, array.length);
    102     }
    103 
    104     public static String toHexString(byte[] array, int offset, int length)
    105     {
    106         char[] buf = new char[length * 2];
    107 
    108         int bufIndex = 0;
    109         for (int i = offset ; i < offset + length; i++)
    110         {
    111             byte b = array[i];
    112             buf[bufIndex++] = HEX_DIGITS[(b >>> 4) & 0x0F];
    113             buf[bufIndex++] = HEX_DIGITS[b & 0x0F];
    114         }
    115 
    116         return new String(buf);
    117     }
    118 
    119     public static String toHexString(int i)
    120     {
    121         return toHexString(toByteArray(i));
    122     }
    123 
    124     public static byte[] toByteArray(byte b)
    125     {
    126         byte[] array = new byte[1];
    127         array[0] = b;
    128         return array;
    129     }
    130 
    131     public static byte[] toByteArray(int i)
    132     {
    133         byte[] array = new byte[4];
    134 
    135         array[3] = (byte)(i & 0xFF);
    136         array[2] = (byte)((i >> 8) & 0xFF);
    137         array[1] = (byte)((i >> 16) & 0xFF);
    138         array[0] = (byte)((i >> 24) & 0xFF);
    139 
    140         return array;
    141     }
    142 
    143     private static int toByte(char c)
    144     {
    145         if (c >= '0' && c <= '9') return (c - '0');
    146         if (c >= 'A' && c <= 'F') return (c - 'A' + 10);
    147         if (c >= 'a' && c <= 'f') return (c - 'a' + 10);
    148 
    149         throw new RuntimeException ("Invalid hex char '" + c + "'");
    150     }
    151 
    152     public static byte[] hexStringToByteArray(String hexString)
    153     {
    154         int length = hexString.length();
    155         byte[] buffer = new byte[length / 2];
    156 
    157         for (int i = 0 ; i < length ; i += 2)
    158         {
    159             buffer[i / 2] = (byte)((toByte(hexString.charAt(i)) << 4) | toByte(hexString.charAt(i+1)));
    160         }
    161 
    162         return buffer;
    163     }
    164 }
    165