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annotate src/com/tmate/hgkit/ll/DigestHelper.java @ 46:4022c34a4804

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Better hashCode impl
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 14 Jan 2011 04:56:53 +0100
parents 92c3d0920d58
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rev   line source
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346b66add79d Basic lookup for incoming changes
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1 /*
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2 * Copyright (c) 2010, 2011 Artem Tikhomirov
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3 */
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4 package com.tmate.hgkit.ll;
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6 import java.io.IOException;
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7 import java.io.InputStream;
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8 import java.security.MessageDigest;
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9 import java.security.NoSuchAlgorithmException;
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11 /**
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12 * <pre>
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13 * DigestHelper dh;
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14 * dh.sha1(...).asHexString();
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15 * or
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16 * dh = dh.sha1(...);
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17 * nodeid.equalsTo(dh.asBinary());
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18 * </pre>
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19 * @author artem
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20 */
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21 public class DigestHelper {
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22 private MessageDigest sha1;
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23 private byte[] digest;
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25 public DigestHelper() {
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26 }
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28 private MessageDigest getSHA1() {
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29 if (sha1 == null) {
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30 try {
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31 sha1 = MessageDigest.getInstance("SHA-1");
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32 } catch (NoSuchAlgorithmException ex) {
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33 // could hardly happen, JDK from Sun always has sha1.
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34 ex.printStackTrace(); // FIXME log error
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35 }
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36 }
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37 return sha1;
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38 }
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41 public DigestHelper sha1(Nodeid nodeid1, Nodeid nodeid2, byte[] data) {
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42 return sha1(nodeid1.cloneData(), nodeid2.cloneData(), data);
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43 }
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45 // sha1_digest(min(p1,p2) ++ max(p1,p2) ++ final_text)
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46 public DigestHelper sha1(byte[] nodeidParent1, byte[] nodeidParent2, byte[] data) {
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47 MessageDigest alg = getSHA1();
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48 if ((nodeidParent1[0] & 0x00FF) < (nodeidParent2[0] & 0x00FF)) {
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49 alg.update(nodeidParent1);
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50 alg.update(nodeidParent2);
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51 } else {
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52 alg.update(nodeidParent2);
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53 alg.update(nodeidParent1);
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54 }
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55 digest = alg.digest(data);
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56 assert digest.length == 20;
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57 return this;
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58 }
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59
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60 public String asHexString() {
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61 if (digest == null) {
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62 throw new IllegalStateException("Shall init with sha1() call first");
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63 }
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64 return toHexString(digest, 0, digest.length);
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65 }
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67 // by reference, be careful not to modify (or #clone() if needed)
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68 public byte[] asBinary() {
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69 if (digest == null) {
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70 throw new IllegalStateException("Shall init with sha1() call first");
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71 }
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72 return digest;
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73 }
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75 // XXX perhaps, digest functions should throw an exception, as it's caller responsibility to deal with eof, etc
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76 public DigestHelper sha1(InputStream is /*ByteBuffer*/) throws IOException {
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77 MessageDigest alg = getSHA1();
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78 byte[] buf = new byte[1024];
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79 int c;
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80 while ((c = is.read(buf)) != -1) {
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81 alg.update(buf, 0, c);
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82 }
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83 digest = alg.digest();
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84 return this;
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85 }
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87 public static String toHexString(byte[] data, final int offset, final int count) {
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88 char[] result = new char[count << 1];
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89 final String hexDigits = "0123456789abcdef";
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90 final int end = offset+count;
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91 for (int i = offset, j = 0; i < end; i++) {
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92 result[j++] = hexDigits.charAt((data[i] >>> 4) & 0x0F);
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93 result[j++] = hexDigits.charAt(data[i] & 0x0F);
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94 }
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95 return new String(result);
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96 }
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97 }