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annotate src/org/tmatesoft/hg/internal/DigestHelper.java @ 338:3cfa4d908fc9

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Add options to control DataAccessProvider, allow to turn off use of file memory mapping in particular to solve potential sharing violation (os file handle gets released on MappedByteByffer being GC'd, not on FileChannel.close())
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 Nov 2011 04:47:03 +0100
parents 981f9f50bb6c
children 9c9c442b5f2e
rev   line source
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1 /*
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2 * Copyright (c) 2010-2011 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.HgBadStateException;
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25 import org.tmatesoft.hg.core.Nodeid;
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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 throw new HgBadStateException(ex);
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54 }
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55 }
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56 return sha1;
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57 }
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60 public DigestHelper sha1(Nodeid nodeid1, Nodeid nodeid2, byte[] data) {
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61 return sha1(nodeid1.toByteArray(), nodeid2.toByteArray(), data);
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62 }
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64 // sha1_digest(min(p1,p2) ++ max(p1,p2) ++ final_text)
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65 public DigestHelper sha1(byte[] nodeidParent1, byte[] nodeidParent2, byte[] data) {
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66 MessageDigest alg = getSHA1();
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67 if ((nodeidParent1[0] & 0x00FF) < (nodeidParent2[0] & 0x00FF)) {
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68 alg.update(nodeidParent1);
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69 alg.update(nodeidParent2);
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70 } else {
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71 alg.update(nodeidParent2);
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72 alg.update(nodeidParent1);
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73 }
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74 digest = alg.digest(data);
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75 assert digest.length == 20;
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76 return this;
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77 }
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79 public String asHexString() {
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80 if (digest == null) {
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81 throw new IllegalStateException("Shall init with sha1() call first");
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82 }
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83 return toHexString(digest, 0, digest.length);
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84 }
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86 // by reference, be careful not to modify (or #clone() if needed)
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87 public byte[] asBinary() {
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88 if (digest == null) {
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89 throw new IllegalStateException("Shall init with sha1() call first");
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90 }
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91 return digest;
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92 }
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94 // XXX perhaps, digest functions should throw an exception, as it's caller responsibility to deal with eof, etc
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95 public DigestHelper sha1(InputStream is /*ByteBuffer*/) throws IOException {
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96 MessageDigest alg = getSHA1();
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97 byte[] buf = new byte[1024];
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98 int c;
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99 while ((c = is.read(buf)) != -1) {
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100 alg.update(buf, 0, c);
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101 }
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102 digest = alg.digest();
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103 return this;
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104 }
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106 public DigestHelper sha1(CharSequence... seq) {
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107 MessageDigest alg = getSHA1();
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108 for (CharSequence s : seq) {
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109 byte[] b = s.toString().getBytes();
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110 alg.update(b);
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111 }
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112 digest = alg.digest();
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113 return this;
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114 }
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116 public static String toHexString(byte[] data, final int offset, final int count) {
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117 char[] result = new char[count << 1];
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118 final String hexDigits = "0123456789abcdef";
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119 final int end = offset+count;
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120 for (int i = offset, j = 0; i < end; i++) {
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121 result[j++] = hexDigits.charAt((data[i] >>> 4) & 0x0F);
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122 result[j++] = hexDigits.charAt(data[i] & 0x0F);
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123 }
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124 return new String(result);
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125 }
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126
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127 public static boolean ascii2bin(byte[] ascii, int offset, int len, byte[] binary) {
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128 assert len % 2 == 0;
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129 assert binary.length >= len >>> 1;
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130
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131 boolean zeroBytes = true;
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132 for (int i = 0, j = offset; i < len >>> 1; i++) {
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133 int b = ascii[j++] & 0xCF; // -0x30 to get decimal digit out from their char, and to uppercase if a letter
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134 int hiNibble = b > 64 ? b - 55 : b;
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135 b = ascii[j++] & 0xCF;
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136 int lowNibble = b > 64 ? b - 55 : b;
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137 if (hiNibble >= 16 || lowNibble >= 16) {
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138 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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139 }
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140 b = (((hiNibble << 4) | lowNibble) & 0xFF);
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141 binary[i] = (byte) b;
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142 zeroBytes = zeroBytes && b == 0;
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143 }
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144 return zeroBytes;
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145 }
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146 }