Mercurial > jhg

annotate src/com/tmate/hgkit/ll/RevlogStream.java @ 48:e34f90b9ded1

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author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 14 Jan 2011 23:22:20 +0100
parents b79cf0118dd3
children 26e3eeaa3962
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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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;
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diff changeset
127 daIndex = getIndexStream();
3
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diff changeset
128 if (needData && !inline) {
9
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diff changeset
129 daData = getDataStream();
2
08db726a0fb7 Shaping out low-level Hg structures
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diff changeset
130 }
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diff changeset
131 try {
24
d4fdd1845b3f Nodeid with array of exactly 20 bytes
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diff changeset
132 byte[] nodeidBuf = new byte[20];
3
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diff changeset
133 byte[] lastData = null;
5
fc265ddeab26 File content and non-effective, although working, patch application
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parents: 4
diff changeset
134 int i;
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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
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parents: 4
diff changeset
138 extraReadsToBaseRev = true;
fc265ddeab26 File content and non-effective, although working, patch application
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parents: 4
diff changeset
139 } else {
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diff changeset
140 i = start;
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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
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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
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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
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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
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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
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parents: 6
diff changeset
152 int parent1Revision = daIndex.readInt();
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parents: 6
diff changeset
153 int parent2Revision = daIndex.readInt();
24
d4fdd1845b3f Nodeid with array of exactly 20 bytes
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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
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parents: 22
diff changeset
155 daIndex.readBytes(nodeidBuf, 0, 20);
9
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parents: 6
diff changeset
156 daIndex.skip(12);
2
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diff changeset
157 byte[] data = null;
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diff changeset
158 if (needData) {
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parents: 0
diff changeset
159 byte[] dataBuf = new byte[compressedLen];
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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
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parents: 6
diff changeset
161 daIndex.readBytes(dataBuf, 0, compressedLen);
2
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
162 } else {
9
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parents: 6
diff changeset
163 daData.seek(index.get(i).offset);
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parents: 6
diff changeset
164 daData.readBytes(dataBuf, 0, compressedLen);
2
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diff changeset
165 }
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diff changeset
166 if (dataBuf[0] == 0x78 /* 'x' */) {
3
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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
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diff changeset
169 zlib.setInput(dataBuf, 0, compressedLen);
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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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diff changeset
172 zlib.end();
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diff changeset
173 data = new byte[resultLen];
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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>
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diff changeset
176 ex.printStackTrace();
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diff changeset
177 data = new byte[0]; // FIXME need better failure strategy
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diff changeset
178 }
2
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
179 } else if (dataBuf[0] == 0x75 /* 'u' */) {
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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);
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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
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diff changeset
187 // XXX
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diff changeset
188 if (baseRevision != i) { // XXX not sure if this is the right way to detect a patch
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diff changeset
189 // this is a patch
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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diff changeset
190 LinkedList<PatchRecord> patches = new LinkedList<PatchRecord>();
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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parents: 2
diff changeset
191 int patchElementIndex = 0;
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
192 do {
36
205f9b59b400 Strip parsing logic out from console frontend
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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
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parents: 2
diff changeset
196 } while (patchElementIndex < data.length);
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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
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parents: 2
diff changeset
200 }
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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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
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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
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parents: 0
diff changeset
210 }
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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
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parents: 6
diff changeset
216 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
217 }
2
08db726a0fb7 Shaping out low-level Hg structures
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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
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parents: 0
diff changeset
221 private void initOutline() {
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
222 if (index != null && !index.isEmpty()) {
08db726a0fb7 Shaping out low-level Hg structures
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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
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parents: 6
diff changeset
226 DataAccess da = getIndexStream();
2
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
227 try {
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
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
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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
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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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 /*package-local for HgBundle; until moved to better place*/static byte[] apply(byte[] baseRevisionContent, int outcomeLen, List<PatchRecord> patch) {
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288 int last = 0, destIndex = 0;
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289 if (outcomeLen == -1) {
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290 outcomeLen = baseRevisionContent.length;
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291 for (PatchRecord pr : patch) {
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292 outcomeLen += pr.start - last + pr.len;
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293 last = pr.end;
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294 }
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295 outcomeLen -= last;
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296 last = 0;
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297 }
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298 byte[] rv = new byte[outcomeLen];
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299 for (PatchRecord pr : patch) {
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300 System.arraycopy(baseRevisionContent, last, rv, destIndex, pr.start-last);
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301 destIndex += pr.start - last;
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302 System.arraycopy(pr.data, 0, rv, destIndex, pr.data.length);
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303 destIndex += pr.data.length;
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304 last = pr.end;
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305 }
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306 System.arraycopy(baseRevisionContent, last, rv, destIndex, baseRevisionContent.length - last);
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307 return rv;
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308 }
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309
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310 // @see http://mercurial.selenic.com/wiki/BundleFormat, in Changelog group description
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311 /*package-local*/ static class PatchRecord { // copy of struct frag from mpatch.c
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312 int start, end, len;
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313 byte[] data;
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314
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315 // TODO consider PatchRecord that only records data position (absolute in data source), and acquires data as needed
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316 private PatchRecord(int p1, int p2, int length, byte[] src) {
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317 start = p1;
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318 end = p2;
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319 len = length;
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320 data = src;
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321 }
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322
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323 /*package-local*/ static PatchRecord read(byte[] data, int offset) {
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324 final int x = offset; // shorthand
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325 int p1 = ((data[x] & 0xFF)<< 24) | ((data[x+1] & 0xFF) << 16) | ((data[x+2] & 0xFF) << 8) | (data[x+3] & 0xFF);
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326 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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327 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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328 byte[] dataCopy = new byte[len];
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329 System.arraycopy(data, x+12, dataCopy, 0, len);
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330 return new PatchRecord(p1, p2, len, dataCopy);
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331 }
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332
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333 /*package-local*/ static PatchRecord read(DataAccess da) throws IOException {
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334 int p1 = da.readInt();
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335 int p2 = da.readInt();
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336 int len = da.readInt();
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337 byte[] src = new byte[len];
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338 da.readBytes(src, 0, len);
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339 return new PatchRecord(p1, p2, len, src);
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340 }
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341
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342
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343 }
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344 }