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annotate src/org/tmatesoft/hg/internal/DigestHelper.java @ 255:5a6ab50b4cbf

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Improve memory footprint of tag collection (about 14 Mb saved for cpython repo without HashMap.Entry and Entry[])
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 16 Aug 2011 14:33:11 +0200
parents a3a2e5deb320
children 0a2f445de774
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.Nodeid;
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27 /**
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28 * <pre>
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29 * DigestHelper dh;
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30 * dh.sha1(...).asHexString();
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31 * or
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32 * dh = dh.sha1(...);
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33 * nodeid.equalsTo(dh.asBinary());
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34 * </pre>
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35 *
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36 * @author Artem Tikhomirov
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37 * @author TMate Software Ltd.
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38 */
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39 public class DigestHelper {
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40 private MessageDigest sha1;
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41 private byte[] digest;
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43 public DigestHelper() {
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44 }
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46 private MessageDigest getSHA1() {
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47 if (sha1 == null) {
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48 try {
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49 sha1 = MessageDigest.getInstance("SHA-1");
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50 } catch (NoSuchAlgorithmException ex) {
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51 // could hardly happen, JDK from Sun always has sha1.
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52 ex.printStackTrace(); // FIXME log error
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53 }
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54 }
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55 return sha1;
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56 }
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59 public DigestHelper sha1(Nodeid nodeid1, Nodeid nodeid2, byte[] data) {
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60 return sha1(nodeid1.toByteArray(), nodeid2.toByteArray(), data);
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61 }
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63 // sha1_digest(min(p1,p2) ++ max(p1,p2) ++ final_text)
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64 public DigestHelper sha1(byte[] nodeidParent1, byte[] nodeidParent2, byte[] data) {
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65 MessageDigest alg = getSHA1();
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66 if ((nodeidParent1[0] & 0x00FF) < (nodeidParent2[0] & 0x00FF)) {
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67 alg.update(nodeidParent1);
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68 alg.update(nodeidParent2);
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69 } else {
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70 alg.update(nodeidParent2);
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71 alg.update(nodeidParent1);
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72 }
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73 digest = alg.digest(data);
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74 assert digest.length == 20;
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75 return this;
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76 }
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78 public String asHexString() {
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79 if (digest == null) {
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80 throw new IllegalStateException("Shall init with sha1() call first");
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81 }
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82 return toHexString(digest, 0, digest.length);
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83 }
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85 // by reference, be careful not to modify (or #clone() if needed)
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86 public byte[] asBinary() {
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87 if (digest == null) {
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88 throw new IllegalStateException("Shall init with sha1() call first");
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89 }
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90 return digest;
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91 }
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93 // XXX perhaps, digest functions should throw an exception, as it's caller responsibility to deal with eof, etc
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94 public DigestHelper sha1(InputStream is /*ByteBuffer*/) throws IOException {
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95 MessageDigest alg = getSHA1();
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96 byte[] buf = new byte[1024];
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97 int c;
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98 while ((c = is.read(buf)) != -1) {
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99 alg.update(buf, 0, c);
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100 }
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101 digest = alg.digest();
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102 return this;
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103 }
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105 public DigestHelper sha1(CharSequence... seq) {
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106 MessageDigest alg = getSHA1();
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107 for (CharSequence s : seq) {
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108 byte[] b = s.toString().getBytes();
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109 alg.update(b);
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110 }
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111 digest = alg.digest();
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112 return this;
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113 }
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115 public static String toHexString(byte[] data, final int offset, final int count) {
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116 char[] result = new char[count << 1];
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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117 final String hexDigits = "0123456789abcdef";
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118 final int end = offset+count;
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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119 for (int i = offset, j = 0; i < end; i++) {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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120 result[j++] = hexDigits.charAt((data[i] >>> 4) & 0x0F);
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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121 result[j++] = hexDigits.charAt(data[i] & 0x0F);
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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122 }
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123 return new String(result);
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124 }
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125 }