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annotate src/org/tmatesoft/hg/internal/DigestHelper.java @ 709:497e697636fc

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Report merged lines as changed block if possible, not as a sequence of added/deleted blocks. To facilitate access to merge parent lines AddBlock got mergeLineAt() method that reports index of the line in the second parent (if any), while insertedAt() has been changed to report index in the first parent always
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 21 Aug 2013 16:23:27 +0200
parents 9c9c442b5f2e
children
rev   line source
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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 }