Mercurial > hg4j

annotate src/com/tmate/hgkit/ll/DigestHelper.java @ 49:26e3eeaa3962

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
branch and user filtering for log operation
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sat, 15 Jan 2011 01:15:38 +0100
parents 92c3d0920d58
children
rev   line source
31
346b66add79d Basic lookup for incoming changes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 17
diff changeset
1 /*
346b66add79d Basic lookup for incoming changes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 17
diff changeset
2 * Copyright (c) 2010, 2011 Artem Tikhomirov
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
3 */
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
4 package com.tmate.hgkit.ll;
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
5
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
6 import java.io.IOException;
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
7 import java.io.InputStream;
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
8 import java.security.MessageDigest;
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
9 import java.security.NoSuchAlgorithmException;
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
10
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
11 /**
42
92c3d0920d58 Real integrity check, with exception. DigestHelper refactored to accomodate new needs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 41
diff changeset
12 * <pre>
92c3d0920d58 Real integrity check, with exception. DigestHelper refactored to accomodate new needs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 41
diff changeset
13 * DigestHelper dh;
92c3d0920d58 Real integrity check, with exception. DigestHelper refactored to accomodate new needs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 41
diff changeset
14 * dh.sha1(...).asHexString();
92c3d0920d58 Real integrity check, with exception. DigestHelper refactored to accomodate new needs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 41
diff changeset
15 * or
92c3d0920d58 Real integrity check, with exception. DigestHelper refactored to accomodate new needs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 41
diff changeset
16 * dh = dh.sha1(...);
92c3d0920d58 Real integrity check, with exception. DigestHelper refactored to accomodate new needs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 41
diff changeset
17 * nodeid.equalsTo(dh.asBinary());
92c3d0920d58 Real integrity check, with exception. DigestHelper refactored to accomodate new needs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 41
diff changeset
18 * </pre>
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
19 * @author artem
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
20 */
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
21 public class DigestHelper {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
22 private MessageDigest sha1;
42
92c3d0920d58 Real integrity check, with exception. DigestHelper refactored to accomodate new needs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 41
diff changeset
23 private byte[] digest;
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
24
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
25 public DigestHelper() {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
26 }
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
27
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
28 private MessageDigest getSHA1() {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
29 if (sha1 == null) {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
30 try {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
31 sha1 = MessageDigest.getInstance("SHA-1");
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
32 } catch (NoSuchAlgorithmException ex) {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
33 // could hardly happen, JDK from Sun always has sha1.
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
34 ex.printStackTrace(); // FIXME log error
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
35 }
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
36 }
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
37 return sha1;
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
38 }
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
39
41
858d1b2458cb Check integrity for bundle changelog. Sort nodeids when calculating hash
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 31
diff changeset
40
42
92c3d0920d58 Real integrity check, with exception. DigestHelper refactored to accomodate new needs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 41
diff changeset
41 public DigestHelper sha1(Nodeid nodeid1, Nodeid nodeid2, byte[] data) {
41
858d1b2458cb Check integrity for bundle changelog. Sort nodeids when calculating hash
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 31
diff changeset
42 return sha1(nodeid1.cloneData(), nodeid2.cloneData(), data);
858d1b2458cb Check integrity for bundle changelog. Sort nodeids when calculating hash
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 31
diff changeset
43 }
858d1b2458cb Check integrity for bundle changelog. Sort nodeids when calculating hash
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 31
diff changeset
44
858d1b2458cb Check integrity for bundle changelog. Sort nodeids when calculating hash
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 31
diff changeset
45 // sha1_digest(min(p1,p2) ++ max(p1,p2) ++ final_text)
42
92c3d0920d58 Real integrity check, with exception. DigestHelper refactored to accomodate new needs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 41
diff changeset
46 public DigestHelper sha1(byte[] nodeidParent1, byte[] nodeidParent2, byte[] data) {
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
47 MessageDigest alg = getSHA1();
41
858d1b2458cb Check integrity for bundle changelog. Sort nodeids when calculating hash
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 31
diff changeset
48 if ((nodeidParent1[0] & 0x00FF) < (nodeidParent2[0] & 0x00FF)) {
858d1b2458cb Check integrity for bundle changelog. Sort nodeids when calculating hash
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 31
diff changeset
49 alg.update(nodeidParent1);
858d1b2458cb Check integrity for bundle changelog. Sort nodeids when calculating hash
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 31
diff changeset
50 alg.update(nodeidParent2);
858d1b2458cb Check integrity for bundle changelog. Sort nodeids when calculating hash
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 31
diff changeset
51 } else {
858d1b2458cb Check integrity for bundle changelog. Sort nodeids when calculating hash
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 31
diff changeset
52 alg.update(nodeidParent2);
858d1b2458cb Check integrity for bundle changelog. Sort nodeids when calculating hash
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 31
diff changeset
53 alg.update(nodeidParent1);
858d1b2458cb Check integrity for bundle changelog. Sort nodeids when calculating hash
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 31
diff changeset
54 }
42
92c3d0920d58 Real integrity check, with exception. DigestHelper refactored to accomodate new needs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 41
diff changeset
55 digest = alg.digest(data);
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
56 assert digest.length == 20;
42
92c3d0920d58 Real integrity check, with exception. DigestHelper refactored to accomodate new needs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 41
diff changeset
57 return this;
92c3d0920d58 Real integrity check, with exception. DigestHelper refactored to accomodate new needs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 41
diff changeset
58 }
92c3d0920d58 Real integrity check, with exception. DigestHelper refactored to accomodate new needs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 41
diff changeset
59
92c3d0920d58 Real integrity check, with exception. DigestHelper refactored to accomodate new needs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 41
diff changeset
60 public String asHexString() {
92c3d0920d58 Real integrity check, with exception. DigestHelper refactored to accomodate new needs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 41
diff changeset
61 if (digest == null) {
92c3d0920d58 Real integrity check, with exception. DigestHelper refactored to accomodate new needs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 41
diff changeset
62 throw new IllegalStateException("Shall init with sha1() call first");
92c3d0920d58 Real integrity check, with exception. DigestHelper refactored to accomodate new needs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 41
diff changeset
63 }
92c3d0920d58 Real integrity check, with exception. DigestHelper refactored to accomodate new needs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 41
diff changeset
64 return toHexString(digest, 0, digest.length);
92c3d0920d58 Real integrity check, with exception. DigestHelper refactored to accomodate new needs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 41
diff changeset
65 }
92c3d0920d58 Real integrity check, with exception. DigestHelper refactored to accomodate new needs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 41
diff changeset
66
92c3d0920d58 Real integrity check, with exception. DigestHelper refactored to accomodate new needs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 41
diff changeset
67 // by reference, be careful not to modify (or #clone() if needed)
92c3d0920d58 Real integrity check, with exception. DigestHelper refactored to accomodate new needs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 41
diff changeset
68 public byte[] asBinary() {
92c3d0920d58 Real integrity check, with exception. DigestHelper refactored to accomodate new needs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 41
diff changeset
69 if (digest == null) {
92c3d0920d58 Real integrity check, with exception. DigestHelper refactored to accomodate new needs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 41
diff changeset
70 throw new IllegalStateException("Shall init with sha1() call first");
92c3d0920d58 Real integrity check, with exception. DigestHelper refactored to accomodate new needs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 41
diff changeset
71 }
92c3d0920d58 Real integrity check, with exception. DigestHelper refactored to accomodate new needs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 41
diff changeset
72 return digest;
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
73 }
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
74
41
858d1b2458cb Check integrity for bundle changelog. Sort nodeids when calculating hash
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 31
diff changeset
75 // XXX perhaps, digest functions should throw an exception, as it's caller responsibility to deal with eof, etc
42
92c3d0920d58 Real integrity check, with exception. DigestHelper refactored to accomodate new needs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 41
diff changeset
76 public DigestHelper sha1(InputStream is /*ByteBuffer*/) throws IOException {
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
77 MessageDigest alg = getSHA1();
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
78 byte[] buf = new byte[1024];
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
79 int c;
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
80 while ((c = is.read(buf)) != -1) {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
81 alg.update(buf, 0, c);
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
82 }
42
92c3d0920d58 Real integrity check, with exception. DigestHelper refactored to accomodate new needs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 41
diff changeset
83 digest = alg.digest();
92c3d0920d58 Real integrity check, with exception. DigestHelper refactored to accomodate new needs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 41
diff changeset
84 return this;
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
85 }
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
86
31
346b66add79d Basic lookup for incoming changes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 17
diff changeset
87 public static String toHexString(byte[] data, final int offset, final int count) {
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
88 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>
parents:
diff changeset
89 final String hexDigits = "0123456789abcdef";
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
90 final int end = offset+count;
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
91 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
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
92 result[j++] = hexDigits.charAt((data[i] >>> 4) & 0x0F);
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
93 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>
parents:
diff changeset
94 }
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
95 return new String(result);
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
96 }
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
97 }