Mercurial > jhg

annotate src/org/tmatesoft/hg/internal/RevlogStream.java @ 79:5f9635c01681

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
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author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 25 Jan 2011 02:26:06 +0100
parents c677e1593919
children 4222b04f34ee
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@svnkit.com
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16 */
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17 package org.tmatesoft.hg.internal;
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19 import static org.tmatesoft.hg.repo.HgRepository.TIP;
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21 import java.io.File;
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22 import java.io.IOException;
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23 import java.util.ArrayList;
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24 import java.util.Collections;
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25 import java.util.LinkedList;
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26 import java.util.List;
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27 import java.util.zip.DataFormatException;
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28 import java.util.zip.Inflater;
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30 import org.tmatesoft.hg.core.Nodeid;
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33 /**
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34 * ? Single RevlogStream per file per repository with accessor to record access session (e.g. with back/forward operations),
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35 * or numerous RevlogStream with separate representation of the underlaying data (cached, lazy ChunkStream)?
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36 *
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37 * @see http://mercurial.selenic.com/wiki/Revlog
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38 * @see http://mercurial.selenic.com/wiki/RevlogNG
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39 *
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40 * @author Artem Tikhomirov
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41 * @author TMate Software Ltd.
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42 */
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43 public class RevlogStream {
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44
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45 private List<IndexEntry> index; // indexed access highly needed
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46 private boolean inline = false;
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47 private final File indexFile;
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48 private final DataAccessProvider dataAccess;
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50 // if we need anything else from HgRepo, might replace DAP parameter with HgRepo and query it for DAP.
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51 public RevlogStream(DataAccessProvider dap, File indexFile) {
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52 this.dataAccess = dap;
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53 this.indexFile = indexFile;
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54 }
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56 /*package*/ DataAccess getIndexStream() {
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57 return dataAccess.create(indexFile);
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58 }
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60 /*package*/ DataAccess getDataStream() {
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61 final String indexName = indexFile.getName();
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62 File dataFile = new File(indexFile.getParentFile(), indexName.substring(0, indexName.length() - 1) + "d");
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63 return dataAccess.create(dataFile);
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64 }
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65
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66 public int revisionCount() {
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67 initOutline();
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68 return index.size();
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69 }
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71 public int dataLength(int revision) {
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72 // XXX in fact, use of iterate() instead of this implementation may be quite reasonable.
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73 //
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74 final int indexSize = revisionCount();
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75 DataAccess daIndex = getIndexStream(); // XXX may supply a hint that I'll need really few bytes of data (although at some offset)
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76 if (revision == TIP) {
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77 revision = indexSize - 1;
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78 }
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79 try {
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80 int recordOffset = inline ? (int) index.get(revision).offset : revision * REVLOGV1_RECORD_SIZE;
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81 daIndex.seek(recordOffset + 12); // 6+2+4
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82 int actualLen = daIndex.readInt();
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83 return actualLen;
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84 } catch (IOException ex) {
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85 ex.printStackTrace(); // log error. FIXME better handling
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86 throw new IllegalStateException(ex);
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87 } finally {
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88 daIndex.done();
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89 }
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90 }
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91
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92 // Perhaps, RevlogStream should be limited to use of plain int revisions for access,
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93 // while Nodeids should be kept on the level up, in Revlog. Guess, Revlog better keep
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94 // map of nodeids, and once this comes true, we may get rid of this method.
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95 // Unlike its counterpart, Revlog#getLocalRevisionNumber, doesn't fail with exception if node not found,
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96 // returns a predefined constant instead
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97 public int findLocalRevisionNumber(Nodeid nodeid) {
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98 // XXX this one may be implemented with iterate() once there's mechanism to stop iterations
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99 final int indexSize = revisionCount();
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100 DataAccess daIndex = getIndexStream();
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101 try {
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102 byte[] nodeidBuf = new byte[20];
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103 for (int i = 0; i < indexSize; i++) {
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104 daIndex.skip(8);
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105 int compressedLen = daIndex.readInt();
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106 daIndex.skip(20);
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107 daIndex.readBytes(nodeidBuf, 0, 20);
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108 if (nodeid.equalsTo(nodeidBuf)) {
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109 return i;
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110 }
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111 daIndex.skip(inline ? 12 + compressedLen : 12);
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112 }
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113 } catch (IOException ex) {
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114 ex.printStackTrace(); // log error. FIXME better handling
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115 throw new IllegalStateException(ex);
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116 } finally {
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117 daIndex.done();
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118 }
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119 return Integer.MIN_VALUE;
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120 }
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121
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123 private final int REVLOGV1_RECORD_SIZE = 64;
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124
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125 // should be possible to use TIP, ALL, or -1, -2, -n notation of Hg
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parents: 2
diff changeset
126 // ? boolean needsNodeid
77
c677e1593919 Moved RevlogStream implementation into .internal
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diff changeset
127 public void iterate(int start, int end, boolean needData, Inspector inspector) {
2
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diff changeset
128 initOutline();
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parents: 0
diff changeset
129 final int indexSize = index.size();
3
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diff changeset
130 if (indexSize == 0) {
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diff changeset
131 return;
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diff changeset
132 }
5
fc265ddeab26 File content and non-effective, although working, patch application
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diff changeset
133 if (end == TIP) {
3
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diff changeset
134 end = indexSize - 1;
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diff changeset
135 }
5
fc265ddeab26 File content and non-effective, although working, patch application
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parents: 4
diff changeset
136 if (start == TIP) {
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parents: 4
diff changeset
137 start = indexSize - 1;
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parents: 4
diff changeset
138 }
2
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parents: 0
diff changeset
139 if (start < 0 || start >= indexSize) {
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parents: 0
diff changeset
140 throw new IllegalArgumentException("Bad left range boundary " + start);
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parents: 0
diff changeset
141 }
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parents: 0
diff changeset
142 if (end < start || end >= indexSize) {
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parents: 0
diff changeset
143 throw new IllegalArgumentException("Bad right range boundary " + end);
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parents: 0
diff changeset
144 }
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parents: 0
diff changeset
145 // XXX may cache [start .. end] from index with a single read (pre-read)
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parents: 0
diff changeset
146
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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diff changeset
147 DataAccess daIndex = null, daData = null;
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diff changeset
148 daIndex = getIndexStream();
3
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diff changeset
149 if (needData && !inline) {
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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parents: 6
diff changeset
150 daData = getDataStream();
2
08db726a0fb7 Shaping out low-level Hg structures
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diff changeset
151 }
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parents: 0
diff changeset
152 try {
24
d4fdd1845b3f Nodeid with array of exactly 20 bytes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
153 byte[] nodeidBuf = new byte[20];
3
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diff changeset
154 byte[] lastData = null;
5
fc265ddeab26 File content and non-effective, although working, patch application
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parents: 4
diff changeset
155 int i;
fc265ddeab26 File content and non-effective, although working, patch application
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 4
diff changeset
156 boolean extraReadsToBaseRev = false;
fc265ddeab26 File content and non-effective, although working, patch application
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parents: 4
diff changeset
157 if (needData && index.get(start).baseRevision < start) {
fc265ddeab26 File content and non-effective, although working, patch application
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 4
diff changeset
158 i = index.get(start).baseRevision;
fc265ddeab26 File content and non-effective, although working, patch application
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parents: 4
diff changeset
159 extraReadsToBaseRev = true;
fc265ddeab26 File content and non-effective, although working, patch application
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 4
diff changeset
160 } else {
fc265ddeab26 File content and non-effective, although working, patch application
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 4
diff changeset
161 i = start;
fc265ddeab26 File content and non-effective, although working, patch application
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 4
diff changeset
162 }
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
163
22
603806cd2dc6 Status of local working dir against non-tip base revision
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 10
diff changeset
164 daIndex.seek(inline ? (int) index.get(i).offset : i * REVLOGV1_RECORD_SIZE);
5
fc265ddeab26 File content and non-effective, although working, patch application
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 4
diff changeset
165 for (; i <= end; i++ ) {
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
166 long l = daIndex.readLong();
49
26e3eeaa3962 branch and user filtering for log operation
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 44
diff changeset
167 @SuppressWarnings("unused")
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
168 long offset = l >>> 16;
49
26e3eeaa3962 branch and user filtering for log operation
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 44
diff changeset
169 @SuppressWarnings("unused")
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
170 int flags = (int) (l & 0X0FFFF);
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
171 int compressedLen = daIndex.readInt();
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
172 int actualLen = daIndex.readInt();
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
173 int baseRevision = daIndex.readInt();
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
174 int linkRevision = daIndex.readInt();
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
175 int parent1Revision = daIndex.readInt();
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
176 int parent2Revision = daIndex.readInt();
24
d4fdd1845b3f Nodeid with array of exactly 20 bytes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 22
diff changeset
177 // Hg has 32 bytes here, uses 20 for nodeid, and keeps 12 last bytes empty
d4fdd1845b3f Nodeid with array of exactly 20 bytes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 22
diff changeset
178 daIndex.readBytes(nodeidBuf, 0, 20);
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
179 daIndex.skip(12);
2
08db726a0fb7 Shaping out low-level Hg structures
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diff changeset
180 byte[] data = null;
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parents: 0
diff changeset
181 if (needData) {
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parents: 0
diff changeset
182 byte[] dataBuf = new byte[compressedLen];
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
183 if (inline) {
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
184 daIndex.readBytes(dataBuf, 0, compressedLen);
2
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
185 } else {
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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parents: 6
diff changeset
186 daData.seek(index.get(i).offset);
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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parents: 6
diff changeset
187 daData.readBytes(dataBuf, 0, compressedLen);
2
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
188 }
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parents: 0
diff changeset
189 if (dataBuf[0] == 0x78 /* 'x' */) {
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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parents: 2
diff changeset
190 try {
33
565ce0835674 TODO added, to try stream for unzip in revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
191 Inflater zlib = new Inflater(); // XXX Consider reuse of Inflater, and/or stream alternative
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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parents: 2
diff changeset
192 zlib.setInput(dataBuf, 0, compressedLen);
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parents: 2
diff changeset
193 byte[] result = new byte[actualLen*2]; // FIXME need to use zlib.finished() instead
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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parents: 2
diff changeset
194 int resultLen = zlib.inflate(result);
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parents: 2
diff changeset
195 zlib.end();
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diff changeset
196 data = new byte[resultLen];
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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parents: 2
diff changeset
197 System.arraycopy(result, 0, data, 0, resultLen);
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
198 } catch (DataFormatException ex) {
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
199 ex.printStackTrace();
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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parents: 2
diff changeset
200 data = new byte[0]; // FIXME need better failure strategy
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
201 }
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
202 } else if (dataBuf[0] == 0x75 /* 'u' */) {
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
203 data = new byte[dataBuf.length - 1];
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parents: 0
diff changeset
204 System.arraycopy(dataBuf, 1, data, 0, data.length);
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
205 } else {
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
206 // XXX Python impl in fact throws exception when there's not 'x', 'u' or '0'
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
207 // but I don't see reason not to return data as is
2
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
208 data = dataBuf;
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
209 }
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
210 // XXX
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
211 if (baseRevision != i) { // XXX not sure if this is the right way to detect a patch
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
212 // this is a patch
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
213 LinkedList<PatchRecord> patches = new LinkedList<PatchRecord>();
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
214 int patchElementIndex = 0;
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
215 do {
36
205f9b59b400 Strip parsing logic out from console frontend
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 35
diff changeset
216 PatchRecord pr = PatchRecord.read(data, patchElementIndex);
205f9b59b400 Strip parsing logic out from console frontend
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 35
diff changeset
217 patches.add(pr);
205f9b59b400 Strip parsing logic out from console frontend
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 35
diff changeset
218 patchElementIndex += 12 + pr.len;
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
219 } while (patchElementIndex < data.length);
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
220 //
5
fc265ddeab26 File content and non-effective, although working, patch application
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 4
diff changeset
221 byte[] baseRevContent = lastData;
6
5abe5af181bd Ant script to build commands and run sample
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 5
diff changeset
222 data = apply(baseRevContent, actualLen, patches);
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
223 }
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
224 } else {
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
225 if (inline) {
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
226 daIndex.skip(compressedLen);
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
227 }
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
228 }
5
fc265ddeab26 File content and non-effective, although working, patch application
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 4
diff changeset
229 if (!extraReadsToBaseRev || i >= start) {
24
d4fdd1845b3f Nodeid with array of exactly 20 bytes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 22
diff changeset
230 inspector.next(i, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, nodeidBuf, data);
5
fc265ddeab26 File content and non-effective, although working, patch application
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 4
diff changeset
231 }
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
232 lastData = data;
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
233 }
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
234 } catch (IOException ex) {
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
235 throw new IllegalStateException(ex); // FIXME need better handling
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
236 } finally {
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
237 daIndex.done();
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
238 if (daData != null) {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
239 daData.done();
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
240 }
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
241 }
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
242 }
0
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
243
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
244 private void initOutline() {
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
245 if (index != null && !index.isEmpty()) {
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
246 return;
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
247 }
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
248 ArrayList<IndexEntry> res = new ArrayList<IndexEntry>();
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
249 DataAccess da = getIndexStream();
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
250 try {
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251 int versionField = da.readInt();
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252 da.readInt(); // just to skip next 2 bytes of offset + flags
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253 final int INLINEDATA = 1 << 16;
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254 inline = (versionField & INLINEDATA) != 0;
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255 long offset = 0; // first offset is always 0, thus Hg uses it for other purposes
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256 while(true) {
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257 int compressedLen = da.readInt();
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258 // 8+4 = 12 bytes total read here
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259 @SuppressWarnings("unused")
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260 int actualLen = da.readInt();
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261 int baseRevision = da.readInt();
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262 // 12 + 8 = 20 bytes read here
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263 // int linkRevision = di.readInt();
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264 // int parent1Revision = di.readInt();
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265 // int parent2Revision = di.readInt();
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266 // byte[] nodeid = new byte[32];
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267 if (inline) {
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268 res.add(new IndexEntry(offset + REVLOGV1_RECORD_SIZE * res.size(), baseRevision));
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269 da.skip(3*4 + 32 + compressedLen); // Check: 44 (skip) + 20 (read) = 64 (total RevlogNG record size)
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270 } else {
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271 res.add(new IndexEntry(offset, baseRevision));
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272 da.skip(3*4 + 32);
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273 }
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274 if (da.isEmpty()) {
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275 // fine, done then
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276 res.trimToSize();
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277 index = res;
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278 break;
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279 } else {
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280 // start reading next record
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281 long l = da.readLong();
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282 offset = l >>> 16;
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283 }
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284 }
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285 } catch (IOException ex) {
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286 ex.printStackTrace(); // log error
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287 // too bad, no outline then.
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288 index = Collections.emptyList();
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289 } finally {
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290 da.done();
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291 }
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292
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293 }
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294
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295
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296 // perhaps, package-local or protected, if anyone else from low-level needs them
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297 // XXX think over if we should keep offset in case of separate data file - we read the field anyway. Perhaps, distinct entry classes for Inline and non-inline indexes?
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298 private static class IndexEntry {
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299 public final long offset; // for separate .i and .d - copy of index record entry, for inline index - actual offset of the record in the .i file (record entry + revision * record size))
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300 //public final int length; // data past fixed record (need to decide whether including header size or not), and whether length is of compressed data or not
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301 public final int baseRevision;
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302
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303 public IndexEntry(long o, int baseRev) {
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304 offset = o;
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305 baseRevision = baseRev;
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306 }
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307 }
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308
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309 // mpatch.c : apply()
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310 // FIXME need to implement patch merge (fold, combine, gather and discard from aforementioned mpatch.[c|py]), also see Revlog and Mercurial PDF
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311 public/*for HgBundle; until moved to better place*/static byte[] apply(byte[] baseRevisionContent, int outcomeLen, List<PatchRecord> patch) {
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312 int last = 0, destIndex = 0;
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313 if (outcomeLen == -1) {
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314 outcomeLen = baseRevisionContent.length;
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315 for (PatchRecord pr : patch) {
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316 outcomeLen += pr.start - last + pr.len;
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317 last = pr.end;
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318 }
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319 outcomeLen -= last;
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320 last = 0;
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321 }
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322 byte[] rv = new byte[outcomeLen];
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323 for (PatchRecord pr : patch) {
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324 System.arraycopy(baseRevisionContent, last, rv, destIndex, pr.start-last);
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325 destIndex += pr.start - last;
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326 System.arraycopy(pr.data, 0, rv, destIndex, pr.data.length);
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327 destIndex += pr.data.length;
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328 last = pr.end;
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329 }
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330 System.arraycopy(baseRevisionContent, last, rv, destIndex, baseRevisionContent.length - last);
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331 return rv;
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332 }
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333
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334 // @see http://mercurial.selenic.com/wiki/BundleFormat, in Changelog group description
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335 public static class PatchRecord {
52
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336 /*
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337 Given there are pr1 and pr2:
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338 pr1.start to pr1.end will be replaced with pr's data (of pr1.len)
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339 pr1.end to pr2.start gets copied from base
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340 */
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341 public int start, end, len;
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342 public byte[] data;
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343
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344 // TODO consider PatchRecord that only records data position (absolute in data source), and acquires data as needed
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345 private PatchRecord(int p1, int p2, int length, byte[] src) {
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346 start = p1;
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347 end = p2;
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348 len = length;
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349 data = src;
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350 }
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351
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352 /*package-local*/ static PatchRecord read(byte[] data, int offset) {
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353 final int x = offset; // shorthand
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354 int p1 = ((data[x] & 0xFF)<< 24) | ((data[x+1] & 0xFF) << 16) | ((data[x+2] & 0xFF) << 8) | (data[x+3] & 0xFF);
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355 int p2 = ((data[x+4] & 0xFF) << 24) | ((data[x+5] & 0xFF) << 16) | ((data[x+6] & 0xFF) << 8) | (data[x+7] & 0xFF);
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356 int len = ((data[x+8] & 0xFF) << 24) | ((data[x+9] & 0xFF) << 16) | ((data[x+10] & 0xFF) << 8) | (data[x+11] & 0xFF);
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357 byte[] dataCopy = new byte[len];
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358 System.arraycopy(data, x+12, dataCopy, 0, len);
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359 return new PatchRecord(p1, p2, len, dataCopy);
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360 }
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361
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362 public /*for HgBundle*/ static PatchRecord read(DataAccess da) throws IOException {
36
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363 int p1 = da.readInt();
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364 int p2 = da.readInt();
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365 int len = da.readInt();
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366 byte[] src = new byte[len];
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367 da.readBytes(src, 0, len);
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368 return new PatchRecord(p1, p2, len, src);
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369 }
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370 }
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371
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372 // FIXME byte[] data might be too expensive, for few usecases it may be better to have intermediate Access object (when we don't need full data
c677e1593919 Moved RevlogStream implementation into .internal
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373 // instantly - e.g. calculate hash, or comparing two revisions
c677e1593919 Moved RevlogStream implementation into .internal
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374 public interface Inspector {
c677e1593919 Moved RevlogStream implementation into .internal
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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375 // XXX boolean retVal to indicate whether to continue?
c677e1593919 Moved RevlogStream implementation into .internal
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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376 // TODO specify nodeid and data length, and reuse policy (i.e. if revlog stream doesn't reuse nodeid[] for each call)
c677e1593919 Moved RevlogStream implementation into .internal
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377 void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[/*20*/] nodeid, byte[] data);
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24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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378 }
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dbd663faec1f Basic changelog parsing
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379 }