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.android.internal.util; 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 private final static char[] HEX_LOWER_CASE_DIGITS = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' }; 23 24 public static String dumpHexString(byte[] array) 25 { 26 return dumpHexString(array, 0, array.length); 27 } 28 29 public static String dumpHexString(byte[] array, int offset, int length) 30 { 31 StringBuilder result = new StringBuilder(); 32 33 byte[] line = new byte[16]; 34 int lineIndex = 0; 35 36 result.append("\n0x"); 37 result.append(toHexString(offset)); 38 39 for (int i = offset ; i < offset + length ; i++) 40 { 41 if (lineIndex == 16) 42 { 43 result.append(" "); 44 45 for (int j = 0 ; j < 16 ; j++) 46 { 47 if (line[j] > ' ' && line[j] < '~') 48 { 49 result.append(new String(line, j, 1)); 50 } 51 else 52 { 53 result.append("."); 54 } 55 } 56 57 result.append("\n0x"); 58 result.append(toHexString(i)); 59 lineIndex = 0; 60 } 61 62 byte b = array[i]; 63 result.append(" "); 64 result.append(HEX_DIGITS[(b >>> 4) & 0x0F]); 65 result.append(HEX_DIGITS[b & 0x0F]); 66 67 line[lineIndex++] = b; 68 } 69 70 if (lineIndex != 16) 71 { 72 int count = (16 - lineIndex) * 3; 73 count++; 74 for (int i = 0 ; i < count ; i++) 75 { 76 result.append(" "); 77 } 78 79 for (int i = 0 ; i < lineIndex ; i++) 80 { 81 if (line[i] > ' ' && line[i] < '~') 82 { 83 result.append(new String(line, i, 1)); 84 } 85 else 86 { 87 result.append("."); 88 } 89 } 90 } 91 92 return result.toString(); 93 } 94 95 public static String toHexString(byte b) 96 { 97 return toHexString(toByteArray(b)); 98 } 99 100 public static String toHexString(byte[] array) 101 { 102 return toHexString(array, 0, array.length, true); 103 } 104 105 public static String toHexString(byte[] array, boolean upperCase) 106 { 107 return toHexString(array, 0, array.length, upperCase); 108 } 109 110 public static String toHexString(byte[] array, int offset, int length) 111 { 112 return toHexString(array, offset, length, true); 113 } 114 115 public static String toHexString(byte[] array, int offset, int length, boolean upperCase) 116 { 117 char[] digits = upperCase ? HEX_DIGITS : HEX_LOWER_CASE_DIGITS; 118 char[] buf = new char[length * 2]; 119 120 int bufIndex = 0; 121 for (int i = offset ; i < offset + length; i++) 122 { 123 byte b = array[i]; 124 buf[bufIndex++] = digits[(b >>> 4) & 0x0F]; 125 buf[bufIndex++] = digits[b & 0x0F]; 126 } 127 128 return new String(buf); 129 } 130 131 public static String toHexString(int i) 132 { 133 return toHexString(toByteArray(i)); 134 } 135 136 public static byte[] toByteArray(byte b) 137 { 138 byte[] array = new byte[1]; 139 array[0] = b; 140 return array; 141 } 142 143 public static byte[] toByteArray(int i) 144 { 145 byte[] array = new byte[4]; 146 147 array[3] = (byte)(i & 0xFF); 148 array[2] = (byte)((i >> 8) & 0xFF); 149 array[1] = (byte)((i >> 16) & 0xFF); 150 array[0] = (byte)((i >> 24) & 0xFF); 151 152 return array; 153 } 154 155 private static int toByte(char c) 156 { 157 if (c >= '0' && c <= '9') return (c - '0'); 158 if (c >= 'A' && c <= 'F') return (c - 'A' + 10); 159 if (c >= 'a' && c <= 'f') return (c - 'a' + 10); 160 161 throw new RuntimeException ("Invalid hex char '" + c + "'"); 162 } 163 164 public static byte[] hexStringToByteArray(String hexString) 165 { 166 int length = hexString.length(); 167 byte[] buffer = new byte[length / 2]; 168 169 for (int i = 0 ; i < length ; i += 2) 170 { 171 buffer[i / 2] = (byte)((toByte(hexString.charAt(i)) << 4) | toByte(hexString.charAt(i+1))); 172 } 173 174 return buffer; 175 } 176 177 public static StringBuilder appendByteAsHex(StringBuilder sb, byte b, boolean upperCase) { 178 char[] digits = upperCase ? HEX_DIGITS : HEX_LOWER_CASE_DIGITS; 179 sb.append(digits[(b >> 4) & 0xf]); 180 sb.append(digits[b & 0xf]); 181 return sb; 182 } 183 184 } 185
