Mercurial > hg4j

annotate src/com/tmate/hgkit/ll/RevlogStream.java @ 51:9429c7bd1920 wrap-data-access

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Try DataAccess to reach revision data instead of plain byte arrays
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sun, 16 Jan 2011 01:20:26 +0100
parents 26e3eeaa3962
children a6f39e595b2b
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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9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
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15 import com.tmate.hgkit.fs.ByteArrayDataAccess;
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16 import com.tmate.hgkit.fs.DataAccess;
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17 import com.tmate.hgkit.fs.DataAccessProvider;
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18 import com.tmate.hgkit.fs.FilterDataAccess;
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19 import com.tmate.hgkit.fs.InflaterDataAccess;
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20
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21 /**
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22 * ? Single RevlogStream per file per repository with accessor to record access session (e.g. with back/forward operations),
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23 * or numerous RevlogStream with separate representation of the underlaying data (cached, lazy ChunkStream)?
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24 * @author artem
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25 * @see http://mercurial.selenic.com/wiki/Revlog
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26 * @see http://mercurial.selenic.com/wiki/RevlogNG
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27 */
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28 public class RevlogStream {
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29
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30 private List<IndexEntry> index; // indexed access highly needed
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31 private boolean inline = false;
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32 private final File indexFile;
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33 private final DataAccessProvider dataAccess;
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34
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35 // if we need anything else from HgRepo, might replace DAP parameter with HgRepo and query it for DAP.
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36 RevlogStream(DataAccessProvider dap, File indexFile) {
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37 this.dataAccess = dap;
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38 this.indexFile = indexFile;
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39 }
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40
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41 /*package*/ DataAccess getIndexStream() {
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42 return dataAccess.create(indexFile);
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43 }
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44
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45 /*package*/ DataAccess getDataStream() {
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46 final String indexName = indexFile.getName();
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47 File dataFile = new File(indexFile.getParentFile(), indexName.substring(0, indexName.length() - 1) + "d");
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48 return dataAccess.create(dataFile);
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49 }
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50
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51 public int revisionCount() {
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52 initOutline();
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53 return index.size();
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54 }
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55
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56 public int dataLength(int revision) {
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57 // XXX in fact, use of iterate() instead of this implementation may be quite reasonable.
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58 //
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59 final int indexSize = revisionCount();
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60 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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61 if (revision == TIP) {
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62 revision = indexSize - 1;
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63 }
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64 try {
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65 int recordOffset = inline ? (int) index.get(revision).offset : revision * REVLOGV1_RECORD_SIZE;
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66 daIndex.seek(recordOffset + 12); // 6+2+4
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67 int actualLen = daIndex.readInt();
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68 return actualLen;
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69 } catch (IOException ex) {
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70 ex.printStackTrace(); // log error. FIXME better handling
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71 throw new IllegalStateException(ex);
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72 } finally {
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73 daIndex.done();
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74 }
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75 }
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76
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77 // Perhaps, RevlogStream should be limited to use of plain int revisions for access,
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78 // while Nodeids should be kept on the level up, in Revlog. Guess, Revlog better keep
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79 // map of nodeids, and once this comes true, we may get rid of this method.
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80 // Unlike its counterpart, Revlog#getLocalRevisionNumber, doesn't fail with exception if node not found,
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81 // returns a predefined constant instead
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82 /*package-local*/ int findLocalRevisionNumber(Nodeid nodeid) {
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83 // XXX this one may be implemented with iterate() once there's mechanism to stop iterations
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84 final int indexSize = revisionCount();
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85 DataAccess daIndex = getIndexStream();
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86 try {
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87 byte[] nodeidBuf = new byte[20];
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88 for (int i = 0; i < indexSize; i++) {
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89 daIndex.skip(8);
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90 int compressedLen = daIndex.readInt();
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91 daIndex.skip(20);
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92 daIndex.readBytes(nodeidBuf, 0, 20);
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93 if (nodeid.equalsTo(nodeidBuf)) {
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94 return i;
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95 }
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96 daIndex.skip(inline ? 12 + compressedLen : 12);
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97 }
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98 } catch (IOException ex) {
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99 ex.printStackTrace(); // log error. FIXME better handling
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100 throw new IllegalStateException(ex);
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101 } finally {
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102 daIndex.done();
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103 }
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104 return Integer.MIN_VALUE;
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105 }
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106
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107
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108 private final int REVLOGV1_RECORD_SIZE = 64;
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109
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110 // should be possible to use TIP, ALL, or -1, -2, -n notation of Hg
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111 // ? boolean needsNodeid
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112 public void iterate(int start, int end, boolean needData, Revlog.Inspector inspector) {
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113 initOutline();
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114 final int indexSize = index.size();
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115 if (indexSize == 0) {
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116 return;
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117 }
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118 if (end == TIP) {
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119 end = indexSize - 1;
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120 }
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121 if (start == TIP) {
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122 start = indexSize - 1;
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123 }
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124 if (start < 0 || start >= indexSize) {
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125 throw new IllegalArgumentException("Bad left range boundary " + start);
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parents: 0
diff changeset
126 }
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parents: 0
diff changeset
127 if (end < start || end >= indexSize) {
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parents: 0
diff changeset
128 throw new IllegalArgumentException("Bad right range boundary " + end);
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parents: 0
diff changeset
129 }
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parents: 0
diff changeset
130 // XXX may cache [start .. end] from index with a single read (pre-read)
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parents: 0
diff changeset
131
9
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diff changeset
132 DataAccess daIndex = null, daData = null;
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diff changeset
133 daIndex = getIndexStream();
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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diff changeset
134 if (needData && !inline) {
9
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
135 daData = getDataStream();
2
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
136 }
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
137 try {
24
d4fdd1845b3f Nodeid with array of exactly 20 bytes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 22
diff changeset
138 byte[] nodeidBuf = new byte[20];
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 49
diff changeset
139 DataAccess lastUserData = null;
5
fc265ddeab26 File content and non-effective, although working, patch application
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 4
diff changeset
140 int i;
fc265ddeab26 File content and non-effective, although working, patch application
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 4
diff changeset
141 boolean extraReadsToBaseRev = false;
fc265ddeab26 File content and non-effective, although working, patch application
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parents: 4
diff changeset
142 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
143 i = index.get(start).baseRevision;
fc265ddeab26 File content and non-effective, although working, patch application
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diff changeset
144 extraReadsToBaseRev = true;
fc265ddeab26 File content and non-effective, although working, patch application
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 4
diff changeset
145 } else {
fc265ddeab26 File content and non-effective, although working, patch application
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 4
diff changeset
146 i = start;
fc265ddeab26 File content and non-effective, although working, patch application
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 4
diff changeset
147 }
9
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parents: 6
diff changeset
148
51
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
149 daIndex.seek(inline ? 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
150 for (; i <= end; i++ ) {
51
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parents: 49
diff changeset
151 if (inline && needData) {
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
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parents: 49
diff changeset
152 // inspector reading data (though FilterDataAccess) may have affected index position
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diff changeset
153 daIndex.seek(index.get(i).offset);
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diff changeset
154 }
9
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diff changeset
155 long l = daIndex.readLong();
49
26e3eeaa3962 branch and user filtering for log operation
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diff changeset
156 @SuppressWarnings("unused")
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
157 long offset = l >>> 16;
49
26e3eeaa3962 branch and user filtering for log operation
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diff changeset
158 @SuppressWarnings("unused")
2
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parents: 0
diff changeset
159 int flags = (int) (l & 0X0FFFF);
9
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parents: 6
diff changeset
160 int compressedLen = daIndex.readInt();
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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parents: 6
diff changeset
161 int actualLen = daIndex.readInt();
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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parents: 6
diff changeset
162 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
163 int linkRevision = daIndex.readInt();
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 int parent1Revision = daIndex.readInt();
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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parents: 6
diff changeset
165 int parent2Revision = daIndex.readInt();
24
d4fdd1845b3f Nodeid with array of exactly 20 bytes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 22
diff changeset
166 // 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
167 daIndex.readBytes(nodeidBuf, 0, 20);
9
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
168 daIndex.skip(12);
51
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parents: 49
diff changeset
169 DataAccess userDataAccess = null;
2
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parents: 0
diff changeset
170 if (needData) {
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
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diff changeset
171 final byte firstByte;
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
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diff changeset
172 long streamOffset = index.get(i).offset;
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parents: 49
diff changeset
173 DataAccess streamDataAccess;
2
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parents: 0
diff changeset
174 if (inline) {
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
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diff changeset
175 streamDataAccess = daIndex;
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diff changeset
176 streamOffset += REVLOGV1_RECORD_SIZE; // don't need to do seek as it's actual position in the index stream
2
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diff changeset
177 } else {
51
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diff changeset
178 streamDataAccess = daData;
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diff changeset
179 daData.seek(streamOffset);
2
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parents: 0
diff changeset
180 }
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
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diff changeset
181 firstByte = streamDataAccess.readByte();
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parents: 49
diff changeset
182 if (firstByte == 0x78 /* 'x' */) {
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 49
diff changeset
183 userDataAccess = new InflaterDataAccess(streamDataAccess, streamOffset, compressedLen);
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parents: 49
diff changeset
184 } else if (firstByte == 0x75 /* 'u' */) {
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 49
diff changeset
185 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset+1, compressedLen-1);
2
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
186 } else {
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parents: 0
diff changeset
187 // XXX Python impl in fact throws exception when there's not 'x', 'u' or '0'
3
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diff changeset
188 // but I don't see reason not to return data as is
51
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 49
diff changeset
189 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset, compressedLen);
2
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
190 }
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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parents: 2
diff changeset
191 // XXX
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
192 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
193 // this is a patch
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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parents: 2
diff changeset
194 LinkedList<PatchRecord> patches = new LinkedList<PatchRecord>();
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
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parents: 49
diff changeset
195 while (!userDataAccess.isEmpty()) {
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 49
diff changeset
196 PatchRecord pr = PatchRecord.read(userDataAccess);
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
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parents: 49
diff changeset
197 System.out.printf("PatchRecord:%d %d %d\n", pr.start, pr.end, pr.len);
36
205f9b59b400 Strip parsing logic out from console frontend
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 35
diff changeset
198 patches.add(pr);
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
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parents: 49
diff changeset
199 }
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 49
diff changeset
200 userDataAccess.done();
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
201 //
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 49
diff changeset
202 byte[] userData = apply(lastUserData, actualLen, patches);
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 49
diff changeset
203 userDataAccess = new ByteArrayDataAccess(userData);
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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parents: 2
diff changeset
204 }
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
205 } else {
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
206 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
207 daIndex.skip(compressedLen);
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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parents: 2
diff changeset
208 }
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
209 }
5
fc265ddeab26 File content and non-effective, although working, patch application
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 4
diff changeset
210 if (!extraReadsToBaseRev || i >= start) {
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 49
diff changeset
211 inspector.next(i, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, nodeidBuf, userDataAccess);
5
fc265ddeab26 File content and non-effective, although working, patch application
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 4
diff changeset
212 }
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 49
diff changeset
213 if (userDataAccess != null) {
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 49
diff changeset
214 userDataAccess.reset();
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 49
diff changeset
215 if (lastUserData != null) {
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 49
diff changeset
216 lastUserData.done();
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 49
diff changeset
217 }
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
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parents: 49
diff changeset
218 lastUserData = userDataAccess;
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 49
diff changeset
219 }
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
220 }
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
221 } catch (IOException ex) {
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
222 throw new IllegalStateException(ex); // FIXME need better handling
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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parents: 2
diff changeset
223 } 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
224 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
225 if (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
226 daData.done();
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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parents: 6
diff changeset
227 }
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
228 }
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
229 }
0
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
230
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
231 private void initOutline() {
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
232 if (index != null && !index.isEmpty()) {
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
233 return;
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
234 }
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
235 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
236 DataAccess da = getIndexStream();
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
237 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
238 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
239 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
240 final int INLINEDATA = 1 << 16;
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
241 inline = (versionField & INLINEDATA) != 0;
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
242 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
243 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
244 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
245 // 8+4 = 12 bytes total read here
49
26e3eeaa3962 branch and user filtering for log operation
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 44
diff changeset
246 @SuppressWarnings("unused")
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
247 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>
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diff changeset
248 int baseRevision = da.readInt();
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249 // 12 + 8 = 20 bytes read here
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250 // int linkRevision = di.readInt();
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251 // int parent1Revision = di.readInt();
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252 // int parent2Revision = di.readInt();
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253 // byte[] nodeid = new byte[32];
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254 if (inline) {
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255 res.add(new IndexEntry(offset + REVLOGV1_RECORD_SIZE * res.size(), baseRevision));
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256 da.skip(3*4 + 32 + compressedLen); // Check: 44 (skip) + 20 (read) = 64 (total RevlogNG record size)
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257 } else {
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258 res.add(new IndexEntry(offset, baseRevision));
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259 da.skip(3*4 + 32);
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260 }
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261 if (da.isEmpty()) {
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262 // fine, done then
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263 res.trimToSize();
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264 index = res;
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265 break;
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266 } else {
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267 // start reading next record
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268 long l = da.readLong();
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269 offset = l >>> 16;
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270 }
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271 }
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272 } catch (IOException ex) {
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273 ex.printStackTrace(); // log error
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274 // too bad, no outline then.
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275 index = Collections.emptyList();
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276 } finally {
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277 da.done();
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278 }
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279
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280 }
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281
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282
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283 // perhaps, package-local or protected, if anyone else from low-level needs them
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284 // 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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285 private static class IndexEntry {
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286 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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287 //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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288 public final int baseRevision;
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289
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290 public IndexEntry(long o, int baseRev) {
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291 offset = o;
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292 baseRevision = baseRev;
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293 }
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294 }
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295
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296 // mpatch.c : apply()
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297 // 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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298 /*package-local for HgBundle; until moved to better place*/static byte[] apply(DataAccess baseRevisionContent, int outcomeLen, List<PatchRecord> patch) throws IOException {
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299 int last = 0, destIndex = 0;
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300 if (outcomeLen == -1) {
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301 outcomeLen = (int) baseRevisionContent.length();
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302 for (PatchRecord pr : patch) {
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303 outcomeLen += pr.start - last + pr.len;
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304 last = pr.end;
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305 }
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306 outcomeLen -= last;
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307 last = 0;
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308 }
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309 System.out.println(baseRevisionContent.length());
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310 byte[] rv = new byte[outcomeLen];
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311 for (PatchRecord pr : patch) {
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312 baseRevisionContent.seek(last);
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313 baseRevisionContent.readBytes(rv, destIndex, pr.start-last);
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314 destIndex += pr.start - last;
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315 System.arraycopy(pr.data, 0, rv, destIndex, pr.data.length);
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316 destIndex += pr.data.length;
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317 last = pr.end;
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318 }
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319 baseRevisionContent.seek(last);
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320 baseRevisionContent.readBytes(rv, destIndex, (int) (baseRevisionContent.length() - last));
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321 return rv;
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322 }
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323
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324 // @see http://mercurial.selenic.com/wiki/BundleFormat, in Changelog group description
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325 /*package-local*/ static class PatchRecord { // copy of struct frag from mpatch.c
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326 int start, end, len;
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327 byte[] data;
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328
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329 // TODO consider PatchRecord that only records data position (absolute in data source), and acquires data as needed
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330 private PatchRecord(int p1, int p2, int length, byte[] src) {
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331 start = p1;
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332 end = p2;
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333 len = length;
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334 data = src;
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335 }
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336
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337 /*package-local*/ static PatchRecord read(byte[] data, int offset) {
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338 final int x = offset; // shorthand
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339 int p1 = ((data[x] & 0xFF)<< 24) | ((data[x+1] & 0xFF) << 16) | ((data[x+2] & 0xFF) << 8) | (data[x+3] & 0xFF);
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340 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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341 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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342 byte[] dataCopy = new byte[len];
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343 System.arraycopy(data, x+12, dataCopy, 0, len);
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344 return new PatchRecord(p1, p2, len, dataCopy);
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345 }
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346
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347 /*package-local*/ static PatchRecord read(DataAccess da) throws IOException {
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348 int p1 = da.readInt();
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349 int p2 = da.readInt();
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350 int len = da.readInt();
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351 byte[] src = new byte[len];
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352 da.readBytes(src, 0, len);
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353 return new PatchRecord(p1, p2, len, src);
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354 }
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355
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356
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357 }
0
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358 }