Mercurial > jhg

annotate src/com/tmate/hgkit/ll/RevlogStream.java @ 37:e45e75e22523

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Parse changesets from bundle's changelog group. Refactor Revlog to provide access to revision's raw content
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 14 Jan 2011 00:49:58 +0100
parents 205f9b59b400
children 1b26247d7367
rev   line source
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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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5
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6 import static com.tmate.hgkit.ll.HgRepository.TIP;
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7
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8 import java.io.File;
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9 import java.io.IOException;
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10 import java.util.ArrayList;
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11 import java.util.Collections;
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12 import java.util.LinkedList;
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13 import java.util.List;
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14 import java.util.zip.DataFormatException;
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15 import java.util.zip.Inflater;
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17 import com.tmate.hgkit.fs.DataAccess;
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18 import com.tmate.hgkit.fs.DataAccessProvider;
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19
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20 /**
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21 * ? Single RevlogStream per file per repository with accessor to record access session (e.g. with back/forward operations),
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22 * or numerous RevlogStream with separate representation of the underlaying data (cached, lazy ChunkStream)?
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23 * @author artem
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24 * @see http://mercurial.selenic.com/wiki/Revlog
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25 * @see http://mercurial.selenic.com/wiki/RevlogNG
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26 */
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27 public class RevlogStream {
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28
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29 private List<IndexEntry> index; // indexed access highly needed
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30 private boolean inline = false;
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31 private final File indexFile;
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32 private final DataAccessProvider dataAccess;
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33
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34 // if we need anything else from HgRepo, might replace DAP parameter with HgRepo and query it for DAP.
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35 RevlogStream(DataAccessProvider dap, File indexFile) {
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36 this.dataAccess = dap;
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37 this.indexFile = indexFile;
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38 }
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39
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40 /*package*/ DataAccess getIndexStream() {
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41 return dataAccess.create(indexFile);
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42 }
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43
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44 /*package*/ DataAccess getDataStream() {
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45 final String indexName = indexFile.getName();
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46 File dataFile = new File(indexFile.getParentFile(), indexName.substring(0, indexName.length() - 1) + "d");
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47 return dataAccess.create(dataFile);
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48 }
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49
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50 public int revisionCount() {
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51 initOutline();
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52 return index.size();
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53 }
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54
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55 public int dataLength(int revision) {
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56 // XXX in fact, use of iterate() instead of this implementation may be quite reasonable.
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57 //
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58 final int indexSize = revisionCount();
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59 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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60 if (revision == TIP) {
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61 revision = indexSize - 1;
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62 }
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63 try {
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64 int recordOffset = inline ? (int) index.get(revision).offset : revision * REVLOGV1_RECORD_SIZE;
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65 daIndex.seek(recordOffset + 12); // 6+2+4
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66 int actualLen = daIndex.readInt();
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67 return actualLen;
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68 } catch (IOException ex) {
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69 ex.printStackTrace(); // log error. FIXME better handling
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70 throw new IllegalStateException(ex);
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71 } finally {
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72 daIndex.done();
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73 }
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74 }
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75
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76 public int findLocalRevisionNumber(Nodeid nodeid) {
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77 // XXX this one may be implemented with iterate() once there's mechanism to stop iterations
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78 final int indexSize = revisionCount();
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79 DataAccess daIndex = getIndexStream();
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80 try {
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81 byte[] nodeidBuf = new byte[20];
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82 for (int i = 0; i < indexSize; i++) {
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83 daIndex.skip(8);
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84 int compressedLen = daIndex.readInt();
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85 daIndex.skip(20);
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86 daIndex.readBytes(nodeidBuf, 0, 20);
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87 if (nodeid.equalsTo(nodeidBuf)) {
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88 return i;
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89 }
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90 daIndex.skip(inline ? 12 + compressedLen : 12);
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91 }
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92 } catch (IOException ex) {
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93 ex.printStackTrace(); // log error. FIXME better handling
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94 throw new IllegalStateException(ex);
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95 } finally {
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96 daIndex.done();
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97 }
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98 throw new IllegalArgumentException(String.format("%s doesn't represent a revision of %s", nodeid.toString(), indexFile.getName() /*XXX HgDataFile.getPath might be more suitable here*/));
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99 }
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100
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101
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102 private final int REVLOGV1_RECORD_SIZE = 64;
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103
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104 // should be possible to use TIP, ALL, or -1, -2, -n notation of Hg
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105 // ? boolean needsNodeid
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106 public void iterate(int start, int end, boolean needData, Revlog.Inspector inspector) {
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107 initOutline();
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108 final int indexSize = index.size();
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109 if (indexSize == 0) {
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110 return;
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111 }
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112 if (end == TIP) {
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113 end = indexSize - 1;
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114 }
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115 if (start == TIP) {
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116 start = indexSize - 1;
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117 }
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118 if (start < 0 || start >= indexSize) {
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119 throw new IllegalArgumentException("Bad left range boundary " + start);
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120 }
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121 if (end < start || end >= indexSize) {
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122 throw new IllegalArgumentException("Bad right range boundary " + end);
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123 }
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124 // XXX may cache [start .. end] from index with a single read (pre-read)
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125
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126 DataAccess daIndex = null, daData = null;
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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parents: 6
diff changeset
127 daIndex = getIndexStream();
3
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parents: 2
diff changeset
128 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
129 daData = getDataStream();
2
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
130 }
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parents: 0
diff changeset
131 try {
24
d4fdd1845b3f Nodeid with array of exactly 20 bytes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
132 byte[] nodeidBuf = new byte[20];
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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diff changeset
133 byte[] lastData = null;
5
fc265ddeab26 File content and non-effective, although working, patch application
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 4
diff changeset
134 int i;
fc265ddeab26 File content and non-effective, although working, patch application
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 4
diff changeset
135 boolean extraReadsToBaseRev = false;
fc265ddeab26 File content and non-effective, although working, patch application
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parents: 4
diff changeset
136 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
137 i = index.get(start).baseRevision;
fc265ddeab26 File content and non-effective, although working, patch application
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 4
diff changeset
138 extraReadsToBaseRev = true;
fc265ddeab26 File content and non-effective, although working, patch application
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 4
diff changeset
139 } else {
fc265ddeab26 File content and non-effective, although working, patch application
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 4
diff changeset
140 i = start;
fc265ddeab26 File content and non-effective, although working, patch application
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 4
diff changeset
141 }
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
142
22
603806cd2dc6 Status of local working dir against non-tip base revision
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 10
diff changeset
143 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
144 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
145 long l = daIndex.readLong();
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
146 long offset = l >>> 16;
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
147 int flags = (int) (l & 0X0FFFF);
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
148 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
149 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
150 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
151 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
152 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
153 int parent2Revision = daIndex.readInt();
24
d4fdd1845b3f Nodeid with array of exactly 20 bytes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 22
diff changeset
154 // 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
155 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
156 daIndex.skip(12);
2
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
157 byte[] data = null;
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
158 if (needData) {
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parents: 0
diff changeset
159 byte[] dataBuf = new byte[compressedLen];
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
160 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
161 daIndex.readBytes(dataBuf, 0, compressedLen);
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
162 } 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
163 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
164 daData.readBytes(dataBuf, 0, compressedLen);
2
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
165 }
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parents: 0
diff changeset
166 if (dataBuf[0] == 0x78 /* 'x' */) {
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
167 try {
33
565ce0835674 TODO added, to try stream for unzip in revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
168 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
169 zlib.setInput(dataBuf, 0, compressedLen);
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parents: 2
diff changeset
170 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
171 int resultLen = zlib.inflate(result);
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parents: 2
diff changeset
172 zlib.end();
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
173 data = new byte[resultLen];
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
174 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
175 } catch (DataFormatException ex) {
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
176 ex.printStackTrace();
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
177 data = new byte[0]; // FIXME need better failure strategy
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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diff changeset
178 }
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
179 } else if (dataBuf[0] == 0x75 /* 'u' */) {
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
180 data = new byte[dataBuf.length - 1];
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parents: 0
diff changeset
181 System.arraycopy(dataBuf, 1, data, 0, data.length);
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
182 } else {
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parents: 0
diff changeset
183 // XXX Python impl in fact throws exception when there's not 'x', 'u' or '0'
3
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parents: 2
diff changeset
184 // but I don't see reason not to return data as is
2
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diff changeset
185 data = dataBuf;
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diff changeset
186 }
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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parents: 2
diff changeset
187 // XXX
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
188 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
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parents: 2
diff changeset
189 // this is a patch
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
190 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
191 int patchElementIndex = 0;
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
192 do {
36
205f9b59b400 Strip parsing logic out from console frontend
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 35
diff changeset
193 PatchRecord pr = PatchRecord.read(data, patchElementIndex);
205f9b59b400 Strip parsing logic out from console frontend
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 35
diff changeset
194 patches.add(pr);
205f9b59b400 Strip parsing logic out from console frontend
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 35
diff changeset
195 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
196 } while (patchElementIndex < data.length);
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
197 //
5
fc265ddeab26 File content and non-effective, although working, patch application
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 4
diff changeset
198 byte[] baseRevContent = lastData;
6
5abe5af181bd Ant script to build commands and run sample
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 5
diff changeset
199 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
200 }
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
201 } else {
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
202 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
203 daIndex.skip(compressedLen);
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
204 }
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
205 }
5
fc265ddeab26 File content and non-effective, although working, patch application
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 4
diff changeset
206 if (!extraReadsToBaseRev || i >= start) {
24
d4fdd1845b3f Nodeid with array of exactly 20 bytes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 22
diff changeset
207 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
208 }
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
209 lastData = data;
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
210 }
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
211 } catch (IOException ex) {
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
212 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
213 } 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
214 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
215 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
216 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
217 }
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
218 }
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
219 }
0
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
220
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
221 private void initOutline() {
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
222 if (index != null && !index.isEmpty()) {
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
223 return;
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
224 }
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
225 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
226 DataAccess da = getIndexStream();
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
227 try {
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
228 int versionField = da.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
229 da.readInt(); // just to skip next 2 bytes of offset + flags
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
230 final int INLINEDATA = 1 << 16;
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
231 inline = (versionField & INLINEDATA) != 0;
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
232 long offset = 0; // first offset is always 0, thus Hg uses it for other purposes
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
233 while(true) {
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
234 int compressedLen = da.readInt();
5
fc265ddeab26 File content and non-effective, although working, patch application
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 4
diff changeset
235 // 8+4 = 12 bytes total read here
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
236 int actualLen = da.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
237 int baseRevision = da.readInt();
5
fc265ddeab26 File content and non-effective, although working, patch application
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 4
diff changeset
238 // 12 + 8 = 20 bytes read here
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
239 // int linkRevision = di.readInt();
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
240 // int parent1Revision = di.readInt();
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
241 // int parent2Revision = di.readInt();
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
242 // byte[] nodeid = new byte[32];
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
243 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
244 res.add(new IndexEntry(offset + REVLOGV1_RECORD_SIZE * res.size(), baseRevision));
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
245 da.skip(3*4 + 32 + compressedLen); // Check: 44 (skip) + 20 (read) = 64 (total RevlogNG record size)
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
246 } else {
5
fc265ddeab26 File content and non-effective, although working, patch application
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 4
diff changeset
247 res.add(new IndexEntry(offset, baseRevision));
9
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248 da.skip(3*4 + 32);
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249 }
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250 if (da.isEmpty()) {
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251 // fine, done then
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252 res.trimToSize();
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253 index = res;
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254 break;
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255 } else {
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256 // start reading next record
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257 long l = da.readLong();
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258 offset = l >>> 16;
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259 }
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260 }
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261 } catch (IOException ex) {
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262 ex.printStackTrace(); // log error
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263 // too bad, no outline then.
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264 index = Collections.emptyList();
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265 } finally {
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266 da.done();
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267 }
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268
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269 }
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270
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271
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272 // perhaps, package-local or protected, if anyone else from low-level needs them
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273 // 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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274 private static class IndexEntry {
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275 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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276 //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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277 public final int baseRevision;
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278
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279 public IndexEntry(long o, int baseRev) {
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280 offset = o;
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281 baseRevision = baseRev;
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282 }
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283 }
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284
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285 // mpatch.c : apply()
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286 // 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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287 // FIXME why 2 arrays (rv and tempBuf)???. Think over in-place merging (perhaps some sparse byte chunk list?) - to minimize mem use.
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288 /*package-local for HgBundle; until moved to better place*/static byte[] apply(byte[] baseRevisionContent, int outcomeLen, List<PatchRecord> patch) {
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289 byte[] tempBuf = new byte[outcomeLen]; // XXX
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290 int last = 0, destIndex = 0;
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291 for (PatchRecord pr : patch) {
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292 System.arraycopy(baseRevisionContent, last, tempBuf, destIndex, pr.start-last);
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293 destIndex += pr.start - last;
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294 System.arraycopy(pr.data, 0, tempBuf, destIndex, pr.data.length);
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295 destIndex += pr.data.length;
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296 last = pr.end;
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297 }
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298 System.arraycopy(baseRevisionContent, last, tempBuf, destIndex, baseRevisionContent.length - last);
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299 destIndex += baseRevisionContent.length - last; // total length
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300 byte[] rv = new byte[destIndex];
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301 System.arraycopy(tempBuf, 0, rv, 0, destIndex);
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302 return rv;
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303 }
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304
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305 // @see http://mercurial.selenic.com/wiki/BundleFormat, in Changelog group description
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306 /*package-local*/ static class PatchRecord { // copy of struct frag from mpatch.c
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307 int start, end, len;
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308 byte[] data;
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309
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310 // TODO consider PatchRecord that only records data position (absolute in data source), and acquires data as needed
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311 private PatchRecord(int p1, int p2, int length, byte[] src) {
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312 start = p1;
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313 end = p2;
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314 len = length;
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315 data = src;
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316 }
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317
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318 /*package-local*/ static PatchRecord read(byte[] data, int offset) {
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319 final int x = offset; // shorthand
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320 int p1 = ((data[x] & 0xFF)<< 24) | ((data[x+1] & 0xFF) << 16) | ((data[x+2] & 0xFF) << 8) | (data[x+3] & 0xFF);
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321 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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322 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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323 byte[] dataCopy = new byte[len];
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324 System.arraycopy(data, x+12, dataCopy, 0, len);
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325 return new PatchRecord(p1, p2, len, dataCopy);
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326 }
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327
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328 /*package-local*/ static PatchRecord read(DataAccess da) throws IOException {
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329 int p1 = da.readInt();
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330 int p2 = da.readInt();
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331 int len = da.readInt();
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332 byte[] src = new byte[len];
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333 da.readBytes(src, 0, len);
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334 return new PatchRecord(p1, p2, len, src);
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335 }
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336
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337
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338 }
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339 }