1 /* |
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2 * Copyright (c) 2008, 2009, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 package sun.jkernel; |
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27 |
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28 /** |
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29 * TODO: The JRE and deploy build code (SplitJRE) can be made a bit smarter |
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30 * then cryto hashcode byte arrays can be used directly, eliminating the need |
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31 * for this class altogether. So just leave this alone until it can be removed. |
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32 * TODO: Change "Digits" to "String" for uniformity and more intuitive names. |
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33 * A lightweight class to provide convert between hex digits and |
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34 * <code>byte[]</code>. |
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35 *<p> |
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36 * TODO: Try to get this built without the -source 1.3 -target -1.3 options, |
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37 * which prevent use of java.text.Format, assuming this wouldn't bloat the |
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38 * JK rt.jar. Also, there still might be equivalent code hiding in the JDK |
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39 * already, but preliminary searches havn't found it. |
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40 */ |
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41 |
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42 public final class ByteArrayToFromHexDigits { |
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43 |
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44 private static final char [] chars = new char[] |
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45 {'0','1','2','3','4','5','6','7','8','9', 'A','B','C','D','E','F'}; |
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46 |
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47 private static final boolean debug = false; |
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48 |
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49 /** |
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50 * Converts the <code>byte[] b</code> into a <code>String</code> of |
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51 * hex digits representing the integer values of all the bytes. |
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52 * |
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53 * @param b byte array to be converted |
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54 * @return String representing <code>b</code> in hexadecimal |
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55 * @throws IllegalArgumentException if <code>b</code> is null or zero length |
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56 */ |
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57 public static String bytesToHexString(byte[] b) { |
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58 if (debug ) { |
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59 System.out.print("I: "); |
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60 for(int i=0;i<b.length;i++) { |
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61 System.out.format("%02X",b[i]); |
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62 } |
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63 System.out.println(); |
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64 } |
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65 if ((b == null) || (b.length == 0)) { |
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66 throw new IllegalArgumentException("argument null or zero length"); |
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67 } |
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68 StringBuffer buff = new StringBuffer(b.length * 2); |
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69 for (int i = 0; i < b.length; i++ ) { |
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70 buff.insert(i*2,chars[(b[i] >> 4) & 0xf]); |
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71 buff.insert(i*2+1,chars[b[i] & 0xf]); |
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72 } |
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73 if (debug ) { |
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74 System.out.println("O: " + buff.toString()); |
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75 } |
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76 return buff.toString(); |
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77 } |
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78 |
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79 // Convert one hex character to a 4 bit byte value |
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80 |
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81 private static byte hexCharToByte(char c) throws IllegalArgumentException { |
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82 if ((c < '0') || |
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83 ( ((c < 'A') && (c > 'F')) && ((c < 'a') && (c > 'f'))) ) { |
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84 |
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85 throw new IllegalArgumentException("not a hex digit"); |
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86 } |
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87 |
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88 if (c > '9') { |
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89 if (c > 'F') { |
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90 return (byte) ((c - 'a' + 10) & 0xf); |
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91 } else { |
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92 return (byte) ((c - 'A' + 10) & 0xf); |
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93 } |
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94 } else { |
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95 return (byte) ((c - '0') & 0xf); |
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96 } |
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97 |
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98 } |
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99 |
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100 /** |
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101 * Converts the <code>String d</code> assumed to contain a sequence |
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102 * of hexadecimal digit characters into a <code>byte[]</code>. |
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103 * |
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104 * @param d String to be converted |
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105 * @return byte array representing the hex string |
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106 * @throws IllegalArgumentException if <code>d</code> is odd length, |
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107 * contains a character outside the ranges of 0-9, a-f, and A-F, |
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108 * or is zero length or null |
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109 */ |
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110 |
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111 public static byte[] hexStringToBytes(String d) throws IllegalArgumentException { |
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112 if (d == null) { |
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113 throw new IllegalArgumentException( |
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114 "parameter cannot be null"); |
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115 } |
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116 |
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117 if (d.length() == 0) { |
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118 throw new IllegalArgumentException( |
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119 "parameter cannot be zero length"); |
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120 } |
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121 |
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122 if ((d.length() & 1) != 0) { |
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123 throw new IllegalArgumentException( |
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124 "odd length string"); |
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125 } |
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126 |
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127 byte[] b = new byte[d.length() / 2]; |
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128 |
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129 // TODO Might be code in the JK initial bundle to do this better (i.e. |
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130 // method that tests for a hex char?) |
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131 |
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132 for (int i=0;i<d.length();i+=2) { |
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133 b[i/2] = (byte) (( (byte) (hexCharToByte(d.charAt(i))) << 4) + |
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134 (byte) hexCharToByte(d.charAt(i+1))); |
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135 } |
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136 return b; |
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137 } |
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138 } |
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