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annotate src/org/tmatesoft/hg/internal/DigestHelper.java @ 444:b3b1db9301a2

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Few comments that emerged while working on examples
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 May 2012 20:19:22 +0200
parents 9c9c442b5f2e
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1 /*
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2 * Copyright (c) 2010-2012 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.internal;
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19 import java.io.IOException;
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20 import java.io.InputStream;
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21 import java.security.MessageDigest;
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22 import java.security.NoSuchAlgorithmException;
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23
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24 import org.tmatesoft.hg.core.Nodeid;
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25 import org.tmatesoft.hg.repo.HgInvalidStateException;
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28 /**
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29 * <pre>
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30 * DigestHelper dh;
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31 * dh.sha1(...).asHexString();
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32 * or
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33 * dh = dh.sha1(...);
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34 * nodeid.equalsTo(dh.asBinary());
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35 * </pre>
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36 *
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37 * @author Artem Tikhomirov
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38 * @author TMate Software Ltd.
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39 */
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40 public class DigestHelper {
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41 private MessageDigest sha1;
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42 private byte[] digest;
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44 public DigestHelper() {
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45 }
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47 private MessageDigest getSHA1() {
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48 if (sha1 == null) {
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49 try {
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50 sha1 = MessageDigest.getInstance("SHA-1");
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51 } catch (NoSuchAlgorithmException ex) {
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52 // could hardly happen, JDK from Sun always has sha1.
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53 HgInvalidStateException t = new HgInvalidStateException("Need SHA-1 algorithm for nodeid calculation");
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54 t.initCause(ex);
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55 throw t;
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56 }
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57 }
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58 return sha1;
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59 }
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62 public DigestHelper sha1(Nodeid nodeid1, Nodeid nodeid2, byte[] data) {
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63 return sha1(nodeid1.toByteArray(), nodeid2.toByteArray(), data);
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64 }
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66 // sha1_digest(min(p1,p2) ++ max(p1,p2) ++ final_text)
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67 public DigestHelper sha1(byte[] nodeidParent1, byte[] nodeidParent2, byte[] data) {
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68 MessageDigest alg = getSHA1();
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69 if ((nodeidParent1[0] & 0x00FF) < (nodeidParent2[0] & 0x00FF)) {
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70 alg.update(nodeidParent1);
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71 alg.update(nodeidParent2);
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72 } else {
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73 alg.update(nodeidParent2);
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74 alg.update(nodeidParent1);
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75 }
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76 digest = alg.digest(data);
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77 assert digest.length == 20;
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78 return this;
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79 }
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81 public String asHexString() {
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82 if (digest == null) {
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83 throw new IllegalStateException("Shall init with sha1() call first");
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84 }
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85 return toHexString(digest, 0, digest.length);
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86 }
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88 // by reference, be careful not to modify (or #clone() if needed)
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89 public byte[] asBinary() {
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90 if (digest == null) {
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91 throw new IllegalStateException("Shall init with sha1() call first");
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92 }
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93 return digest;
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94 }
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96 // XXX perhaps, digest functions should throw an exception, as it's caller responsibility to deal with eof, etc
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97 public DigestHelper sha1(InputStream is /*ByteBuffer*/) throws IOException {
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98 MessageDigest alg = getSHA1();
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99 byte[] buf = new byte[1024];
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100 int c;
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101 while ((c = is.read(buf)) != -1) {
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102 alg.update(buf, 0, c);
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103 }
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104 digest = alg.digest();
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105 return this;
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106 }
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108 public DigestHelper sha1(CharSequence... seq) {
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109 MessageDigest alg = getSHA1();
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110 for (CharSequence s : seq) {
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111 byte[] b = s.toString().getBytes();
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112 alg.update(b);
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113 }
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114 digest = alg.digest();
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115 return this;
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116 }
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117
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118 public static String toHexString(byte[] data, final int offset, final int count) {
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119 char[] result = new char[count << 1];
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120 final String hexDigits = "0123456789abcdef";
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121 final int end = offset+count;
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122 for (int i = offset, j = 0; i < end; i++) {
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123 result[j++] = hexDigits.charAt((data[i] >>> 4) & 0x0F);
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124 result[j++] = hexDigits.charAt(data[i] & 0x0F);
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125 }
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126 return new String(result);
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127 }
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128
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129 public static boolean ascii2bin(byte[] ascii, int offset, int len, byte[] binary) {
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130 assert len % 2 == 0;
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131 assert binary.length >= len >>> 1;
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132
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133 boolean zeroBytes = true;
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134 for (int i = 0, j = offset; i < len >>> 1; i++) {
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135 int b = ascii[j++] & 0xCF; // -0x30 to get decimal digit out from their char, and to uppercase if a letter
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136 int hiNibble = b > 64 ? b - 55 : b;
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137 b = ascii[j++] & 0xCF;
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138 int lowNibble = b > 64 ? b - 55 : b;
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139 if (hiNibble >= 16 || lowNibble >= 16) {
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140 throw new IllegalArgumentException(String.format("Characters '%c%c' (%1$d and %2$d) at index %d are not valid hex digits", ascii[j-2], ascii[j-1], j-2));
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141 }
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142 b = (((hiNibble << 4) | lowNibble) & 0xFF);
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143 binary[i] = (byte) b;
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144 zeroBytes = zeroBytes && b == 0;
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145 }
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146 return zeroBytes;
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147 }
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148 }