Mercurial > hg4j

annotate src/org/tmatesoft/hg/internal/RevlogStream.java @ 297:e7ca6f16d074

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Better message for incorrect range requested
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sat, 17 Sep 2011 00:48:34 +0200
parents 981f9f50bb6c
children 650b45d290b1
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1 /*
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2 * Copyright (c) 2010-2011 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.internal;
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18
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19 import static org.tmatesoft.hg.repo.HgRepository.BAD_REVISION;
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20 import static org.tmatesoft.hg.repo.HgRepository.TIP;
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22 import java.io.File;
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23 import java.io.IOException;
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24 import java.util.ArrayList;
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25 import java.util.List;
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26 import java.util.zip.Inflater;
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27
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28 import org.tmatesoft.hg.core.HgBadStateException;
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29 import org.tmatesoft.hg.core.Nodeid;
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30 import org.tmatesoft.hg.repo.HgRepository;
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33 /**
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34 * ? Single RevlogStream per file per repository with accessor to record access session (e.g. with back/forward operations),
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35 * or numerous RevlogStream with separate representation of the underlying data (cached, lazy ChunkStream)?
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36 *
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37 * @see http://mercurial.selenic.com/wiki/Revlog
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38 * @see http://mercurial.selenic.com/wiki/RevlogNG
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39 *
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40 * @author Artem Tikhomirov
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41 * @author TMate Software Ltd.
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42 */
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43 public class RevlogStream {
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44
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45 /*
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46 * makes sense for index with inline data only - actual offset of the record in the .i file (record entry + revision * record size))
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47 *
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48 * long[] in fact (there are 8-bytes field in the revlog)
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49 * However, (a) DataAccess currently doesn't operate with long seek/length
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50 * and, of greater significance, (b) files with inlined data are designated for smaller files,
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51 * guess, about 130 Kb, and offset there won't ever break int capacity
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52 */
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53 private int[] indexRecordOffset;
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54 private int[] baseRevisions;
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55 private boolean inline = false;
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56 private final File indexFile;
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57 private final DataAccessProvider dataAccess;
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58
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59 // if we need anything else from HgRepo, might replace DAP parameter with HgRepo and query it for DAP.
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60 public RevlogStream(DataAccessProvider dap, File indexFile) {
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61 this.dataAccess = dap;
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62 this.indexFile = indexFile;
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63 }
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65 /*package*/ DataAccess getIndexStream() {
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66 // XXX may supply a hint that I'll need really few bytes of data (perhaps, at some offset)
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67 // to avoid mmap files when only few bytes are to be read (i.e. #dataLength())
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68 return dataAccess.create(indexFile);
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69 }
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71 /*package*/ DataAccess getDataStream() {
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72 final String indexName = indexFile.getName();
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73 File dataFile = new File(indexFile.getParentFile(), indexName.substring(0, indexName.length() - 1) + "d");
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74 return dataAccess.create(dataFile);
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75 }
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77 public int revisionCount() {
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78 initOutline();
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79 return baseRevisions.length;
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80 }
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81
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82 /**
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83 * @throws HgBadStateException if internal read operation failed
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84 */
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85 public int dataLength(int revision) {
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86 // XXX in fact, use of iterate() instead of this implementation may be quite reasonable.
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87 //
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88 final int indexSize = revisionCount();
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89 DataAccess daIndex = getIndexStream();
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90 if (revision == TIP) {
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91 revision = indexSize - 1;
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92 }
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93 try {
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94 int recordOffset = getIndexOffsetInt(revision);
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95 daIndex.seek(recordOffset + 12); // 6+2+4
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96 int actualLen = daIndex.readInt();
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97 return actualLen;
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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 HgBadStateException(ex);
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101 } finally {
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102 daIndex.done();
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103 }
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104 }
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105
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106 /**
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107 * @throws HgBadStateException if internal read operation failed
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108 */
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109 public byte[] nodeid(int revision) {
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110 final int indexSize = revisionCount();
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111 if (revision == TIP) {
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112 revision = indexSize - 1;
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113 }
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114 if (revision < 0 || revision >= indexSize) {
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115 throw new IllegalArgumentException(Integer.toString(revision));
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116 }
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117 DataAccess daIndex = getIndexStream();
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118 try {
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119 int recordOffset = getIndexOffsetInt(revision);
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120 daIndex.seek(recordOffset + 32);
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121 byte[] rv = new byte[20];
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122 daIndex.readBytes(rv, 0, 20);
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123 return rv;
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124 } catch (IOException ex) {
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125 ex.printStackTrace();
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126 throw new HgBadStateException();
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127 } finally {
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128 daIndex.done();
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129 }
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130 }
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131
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132 /**
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133 * Get link field from the index record.
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134 * @throws HgBadStateException if internal read operation failed
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135 */
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136 public int linkRevision(int revision) {
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137 final int last = revisionCount() - 1;
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138 if (revision == TIP) {
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139 revision = last;
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140 }
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141 if (revision < 0 || revision > last) {
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142 throw new IllegalArgumentException(Integer.toString(revision));
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143 }
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144 DataAccess daIndex = getIndexStream();
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145 try {
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146 int recordOffset = getIndexOffsetInt(revision);
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147 daIndex.seek(recordOffset + 20);
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148 int linkRev = daIndex.readInt();
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149 return linkRev;
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150 } catch (IOException ex) {
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151 ex.printStackTrace();
295
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152 throw new HgBadStateException();
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153 } finally {
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154 daIndex.done();
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155 }
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156 }
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157
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158 // Perhaps, RevlogStream should be limited to use of plain int revisions for access,
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159 // while Nodeids should be kept on the level up, in Revlog. Guess, Revlog better keep
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160 // map of nodeids, and once this comes true, we may get rid of this method.
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161 // Unlike its counterpart, {@link Revlog#getLocalRevisionNumber()}, doesn't fail with exception if node not found,
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162 /**
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163 * @return integer in [0..revisionCount()) or {@link HgRepository#BAD_REVISION} if not found
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164 */
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165 public int findLocalRevisionNumber(Nodeid nodeid) {
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166 // XXX this one may be implemented with iterate() once there's mechanism to stop iterations
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167 final int indexSize = revisionCount();
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168 DataAccess daIndex = getIndexStream();
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169 try {
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170 byte[] nodeidBuf = new byte[20];
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171 for (int i = 0; i < indexSize; i++) {
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172 daIndex.skip(8);
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173 int compressedLen = daIndex.readInt();
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174 daIndex.skip(20);
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175 daIndex.readBytes(nodeidBuf, 0, 20);
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176 if (nodeid.equalsTo(nodeidBuf)) {
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177 return i;
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178 }
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179 daIndex.skip(inline ? 12 + compressedLen : 12);
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180 }
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181 } catch (IOException ex) {
243
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182 ex.printStackTrace(); // log error. FIXME better handling. Perhaps, shall return BAD_REVISION here as well?
22
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183 throw new IllegalStateException(ex);
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184 } finally {
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185 daIndex.done();
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186 }
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187 return BAD_REVISION;
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188 }
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189
2
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190
9
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191 private final int REVLOGV1_RECORD_SIZE = 64;
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192
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193 // should be possible to use TIP, ALL, or -1, -2, -n notation of Hg
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194 // ? boolean needsNodeid
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195 public void iterate(int start, int end, boolean needData, Inspector inspector) {
2
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196 initOutline();
198
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197 final int indexSize = revisionCount();
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198 if (indexSize == 0) {
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199 return;
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200 }
5
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201 if (end == TIP) {
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202 end = indexSize - 1;
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203 }
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204 if (start == TIP) {
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205 start = indexSize - 1;
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206 }
2
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207 if (start < 0 || start >= indexSize) {
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208 throw new IllegalArgumentException(String.format("Bad left range boundary %d in [0..%d]", start, indexSize-1));
2
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209 }
297
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210 if (end >= indexSize) {
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diff changeset
211 throw new IllegalArgumentException(String.format("Bad right range boundary %d in [0..%d]", end, indexSize-1));
2
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212 }
297
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213 if (end < start) {
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214 throw new IllegalArgumentException(String.format("Bad range [%d..%d]", start, end));
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diff changeset
215 }
2
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216 // XXX may cache [start .. end] from index with a single read (pre-read)
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diff changeset
217
242
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diff changeset
218 ReaderN1 r = new ReaderN1(needData, inspector);
2
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219 try {
242
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220 r.start(end - start + 1);
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diff changeset
221 r.range(start, end);
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diff changeset
222 } catch (IOException ex) {
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diff changeset
223 throw new HgBadStateException(ex); // FIXME need better handling
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diff changeset
224 } finally {
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diff changeset
225 r.finish();
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diff changeset
226 }
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diff changeset
227 }
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diff changeset
228
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diff changeset
229 /**
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230 * Effective alternative to {@link #iterate(int, int, boolean, Inspector) batch read}, when only few selected
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231 * revisions are of interest.
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diff changeset
232 * @param sortedRevisions revisions to walk, in ascending order.
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233 * @param needData whether inspector needs access to header only
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234 * @param inspector callback to process entries
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diff changeset
235 */
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diff changeset
236 public void iterate(int[] sortedRevisions, boolean needData, Inspector inspector) {
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237 final int indexSize = revisionCount();
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diff changeset
238 if (indexSize == 0 || sortedRevisions.length == 0) {
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diff changeset
239 return;
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diff changeset
240 }
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diff changeset
241 if (sortedRevisions[0] > indexSize || sortedRevisions[sortedRevisions.length - 1] > indexSize) {
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diff changeset
242 throw new IllegalArgumentException(String.format("Can't iterate [%d, %d] in range [0..%d]", sortedRevisions[0], sortedRevisions[sortedRevisions.length - 1], indexSize));
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diff changeset
243 }
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diff changeset
244
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diff changeset
245 ReaderN1 r = new ReaderN1(needData, inspector);
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diff changeset
246 try {
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diff changeset
247 r.start(sortedRevisions.length);
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diff changeset
248 for (int i = 0; i < sortedRevisions.length; ) {
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diff changeset
249 int x = i;
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diff changeset
250 i++;
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diff changeset
251 while (i < sortedRevisions.length) {
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diff changeset
252 if (sortedRevisions[i] == sortedRevisions[i-1] + 1) {
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diff changeset
253 i++;
2
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254 } else {
217
e39cf474ef94 Experimental support to mix-in start and end events for inspectors. Additionally, Lifecycle may serve as iteration control
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255 break;
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256 }
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257 }
242
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258 // commitRevisions[x..i-1] are sequential
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259 if (!r.range(sortedRevisions[x], sortedRevisions[i-1])) {
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260 return;
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
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261 }
2
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262 }
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263 } catch (IOException ex) {
158
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264 throw new HgBadStateException(ex); // FIXME need better handling
3
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265 } finally {
242
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266 r.finish();
2
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267 }
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268 }
198
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269
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270 private int getBaseRevision(int revision) {
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271 return baseRevisions[revision];
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272 }
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273
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274 /**
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275 * @return offset of the revision's record in the index (.i) stream
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276 */
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277 private int getIndexOffsetInt(int revision) {
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278 return inline ? indexRecordOffset[revision] : revision * REVLOGV1_RECORD_SIZE;
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279 }
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280
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281 private void initOutline() {
198
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282 if (baseRevisions != null && baseRevisions.length > 0) {
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283 return;
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284 }
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285 DataAccess da = getIndexStream();
2
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286 try {
202
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287 if (da.isEmpty()) {
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288 // do not fail with exception if stream is empty, it's likely intentional
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289 baseRevisions = new int[0];
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290 return;
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291 }
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292 int versionField = da.readInt();
170
71ddbf8603e8 Initial clone: populate given directory from a bundle. Everything but remote server access is there, albeit prototype code style
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293 da.readInt(); // just to skip next 4 bytes of offset + flags
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294 final int INLINEDATA = 1 << 16;
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295 inline = (versionField & INLINEDATA) != 0;
288
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296 IntVector resBases, resOffsets = null;
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297 int entryCountGuess = da.length() / REVLOGV1_RECORD_SIZE;
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298 if (inline) {
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299 entryCountGuess >>>= 2; // pure guess, assume useful data takes 3/4 of total space
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300 resOffsets = new IntVector(entryCountGuess, 5000);
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301 }
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302 resBases = new IntVector(entryCountGuess, 5000);
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303
2
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304 long offset = 0; // first offset is always 0, thus Hg uses it for other purposes
9
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305 while(true) {
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306 int compressedLen = da.readInt();
5
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307 // 8+4 = 12 bytes total read here
49
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diff changeset
308 @SuppressWarnings("unused")
9
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309 int actualLen = da.readInt();
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310 int baseRevision = da.readInt();
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311 // 12 + 8 = 20 bytes read here
2
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312 // int linkRevision = di.readInt();
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313 // int parent1Revision = di.readInt();
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314 // int parent2Revision = di.readInt();
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315 // byte[] nodeid = new byte[32];
198
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316 resBases.add(baseRevision);
2
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317 if (inline) {
198
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diff changeset
318 int o = (int) offset;
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319 if (o != offset) {
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320 // just in case, can't happen, ever, unless HG (or some other bad tool) produces index file
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321 // with inlined data of size greater than 2 Gb.
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322 throw new HgBadStateException("Data too big, offset didn't fit to sizeof(int)");
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323 }
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324 resOffsets.add(o + REVLOGV1_RECORD_SIZE * resOffsets.size());
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325 da.skip(3*4 + 32 + compressedLen); // Check: 44 (skip) + 20 (read) = 64 (total RevlogNG record size)
2
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326 } else {
9
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327 da.skip(3*4 + 32);
2
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328 }
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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diff changeset
329 if (da.isEmpty()) {
9
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330 // fine, done then
288
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331 baseRevisions = resBases.toArray(true);
198
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diff changeset
332 if (inline) {
288
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diff changeset
333 indexRecordOffset = resOffsets.toArray(true);
198
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diff changeset
334 }
9
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335 break;
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diff changeset
336 } else {
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337 // start reading next record
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diff changeset
338 long l = da.readLong();
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339 offset = l >>> 16;
9
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340 }
2
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341 }
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342 } catch (IOException ex) {
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diff changeset
343 ex.printStackTrace(); // log error
198
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diff changeset
344 // too bad, no outline then, but don't fail with NPE
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diff changeset
345 baseRevisions = new int[0];
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346 } finally {
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diff changeset
347 da.done();
2
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diff changeset
348 }
3
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diff changeset
349 }
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diff changeset
350
242
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351 /**
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352 * operation with single file open/close and multiple diverse reads.
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353 * XXX initOutline might need similar extraction to keen N1 format knowledge
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diff changeset
354 */
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diff changeset
355 class ReaderN1 {
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356 private final Inspector inspector;
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357 private final boolean needData;
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358 private DataAccess daIndex = null, daData = null;
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359 private Lifecycle.BasicCallback cb = null;
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360 private int lastRevisionRead = BAD_REVISION;
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361 private DataAccess lastUserData;
263
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diff changeset
362 // next are to track two major bottlenecks - patch application and actual time spent in inspector
264
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363 // private long applyTime, inspectorTime; // TIMING
263
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364
242
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365
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366 public ReaderN1(boolean needData, Inspector insp) {
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367 assert insp != null;
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368 this.needData = needData;
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369 inspector = insp;
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370 }
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371
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372 public void start(int totalWork) {
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373 daIndex = getIndexStream();
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diff changeset
374 if (needData && !inline) {
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diff changeset
375 daData = getDataStream();
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376 }
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377 if (inspector instanceof Lifecycle) {
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378 cb = new Lifecycle.BasicCallback();
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379 ((Lifecycle) inspector).start(totalWork, cb, cb);
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380 }
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381 // applyTime = inspectorTime = 0; // TIMING
242
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382 }
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383
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384 public void finish() {
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385 if (lastUserData != null) {
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386 lastUserData.done();
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387 lastUserData = null;
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388 }
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389 if (inspector instanceof Lifecycle) {
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390 ((Lifecycle) inspector).finish(cb);
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391 }
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392 daIndex.done();
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393 if (daData != null) {
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394 daData.done();
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395 }
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396 // System.out.printf("applyTime:%d ms, inspectorTime: %d ms\n", applyTime, inspectorTime); // TIMING
242
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397 }
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398
242
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399 public boolean range(int start, int end) throws IOException {
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400 byte[] nodeidBuf = new byte[20];
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401 int i;
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402 boolean extraReadsToBaseRev = false; // to indicate we read revision prior to start. XXX not sure can't do without
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403 // it (i.e. replace with i >= start)
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404 if (needData && (i = getBaseRevision(start)) < start) {
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405 // if lastRevisionRead in [baseRevision(start), start) can reuse lastUserData
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406 // doesn't make sense to reuse if lastRevisionRead == start (too much to change in the cycle below).
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407 if (lastRevisionRead != BAD_REVISION && i <= lastRevisionRead && lastRevisionRead < start) {
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408 i = lastRevisionRead + 1; // start with first not-yet-read revision
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409 extraReadsToBaseRev = i < start;
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410 } else {
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411 if (lastUserData != null) {
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412 lastUserData.done();
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413 lastUserData = null;
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414 }
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415 extraReadsToBaseRev = true;
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416 }
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417 } else {
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418 // don't need to clean lastUserData as it's always null when !needData
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419 i = start;
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420 }
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421
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422 daIndex.seek(getIndexOffsetInt(i));
258
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423 //
263
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424 // reuse some instances
258
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425 final ArrayList<PatchRecord> patches = new ArrayList<PatchRecord>();
263
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426 final Inflater inflater = new Inflater();
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427 // can share buffer between instances of InflaterDataAccess as I never read any two of them in parallel
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428 final byte[] inflaterBuffer = new byte[1024];
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429 //
242
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430
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431 for (; i <= end; i++ ) {
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432 if (inline && needData) {
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433 // inspector reading data (though FilterDataAccess) may have affected index position
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434 daIndex.seek(getIndexOffsetInt(i));
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435 }
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436 long l = daIndex.readLong(); // 0
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437 long offset = i == 0 ? 0 : (l >>> 16);
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438 @SuppressWarnings("unused")
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439 int flags = (int) (l & 0X0FFFF);
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440 int compressedLen = daIndex.readInt(); // +8
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441 int actualLen = daIndex.readInt(); // +12
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442 int baseRevision = daIndex.readInt(); // +16
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443 int linkRevision = daIndex.readInt(); // +20
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444 int parent1Revision = daIndex.readInt();
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445 int parent2Revision = daIndex.readInt();
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446 // Hg has 32 bytes here, uses 20 for nodeid, and keeps 12 last bytes empty
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447 daIndex.readBytes(nodeidBuf, 0, 20); // +32
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448 daIndex.skip(12);
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449 DataAccess userDataAccess = null;
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450 if (needData) {
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451 int streamOffset;
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452 DataAccess streamDataAccess;
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453 if (inline) {
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454 streamDataAccess = daIndex;
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455 streamOffset = getIndexOffsetInt(i) + REVLOGV1_RECORD_SIZE; // don't need to do seek as it's actual position in the index stream
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456 } else {
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457 streamOffset = (int) offset;
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458 streamDataAccess = daData;
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459 daData.seek(streamOffset);
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460 }
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461 final boolean patchToPrevious = baseRevision != i; // the only way I found to tell if it's a patch
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462 if (streamDataAccess.isEmpty()) {
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463 userDataAccess = new DataAccess(); // empty
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464 } else {
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465 final byte firstByte = streamDataAccess.readByte();
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466 if (firstByte == 0x78 /* 'x' */) {
263
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467 inflater.reset();
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468 userDataAccess = new InflaterDataAccess(streamDataAccess, streamOffset, compressedLen, patchToPrevious ? -1 : actualLen, inflater, inflaterBuffer);
242
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469 } else if (firstByte == 0x75 /* 'u' */) {
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470 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset+1, compressedLen-1);
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471 } else {
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472 // XXX Python impl in fact throws exception when there's not 'x', 'u' or '0'
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473 // but I don't see reason not to return data as is
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474 userDataAccess = new FilterDataAccess(streamDataAccess, streamOffset, compressedLen);
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475 }
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476 }
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477 // XXX
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478 if (patchToPrevious) {
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479 // this is a patch
263
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480 patches.clear(); // won't hurt to ensure there are no leftovers, even if we already cleaned
242
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481 while (!userDataAccess.isEmpty()) {
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482 PatchRecord pr = PatchRecord.read(userDataAccess);
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483 // System.out.printf("PatchRecord:%d %d %d\n", pr.start, pr.end, pr.len);
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484 patches.add(pr);
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485 }
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486 userDataAccess.done();
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487 //
263
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488 // it shall be reset at the end of prev iteration, when it got assigned from userDataAccess
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489 // however, actual userDataAccess and lastUserData may share Inflater object, which needs to be reset
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490 // Alternatively, userDataAccess.done() above may be responsible to reset Inflater (if it's InflaterDataAccess)
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491 lastUserData.reset();
264
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492 // final long startMeasuring = System.currentTimeMillis(); // TIMING
242
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493 byte[] userData = apply(lastUserData, actualLen, patches);
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494 // applyTime += (System.currentTimeMillis() - startMeasuring); // TIMING
263
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495 patches.clear(); // do not keep any reference, allow PatchRecord to be gc'd
242
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496 userDataAccess = new ByteArrayDataAccess(userData);
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497 }
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498 } else {
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499 if (inline) {
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500 daIndex.skip(compressedLen);
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501 }
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502 }
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503 if (!extraReadsToBaseRev || i >= start) {
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504 // final long startMeasuring = System.currentTimeMillis(); // TIMING
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505 inspector.next(i, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, nodeidBuf, userDataAccess);
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506 // inspectorTime += (System.currentTimeMillis() - startMeasuring); // TIMING
242
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507 }
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508 if (cb != null) {
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509 if (cb.isStopped()) {
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510 return false;
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511 }
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512 }
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513 if (userDataAccess != null) {
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514 userDataAccess.reset(); // not sure this is necessary here, as lastUserData would get reset anyway before next use.
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515 }
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516 if (lastUserData != null) {
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517 lastUserData.done();
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518 }
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519 lastUserData = userDataAccess;
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520 }
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521 lastRevisionRead = end;
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522 return true;
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523 }
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524 }
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525
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526
3
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527 // mpatch.c : apply()
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diff changeset
528 // 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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diff changeset
529 public/*for HgBundle; until moved to better place*/static byte[] apply(DataAccess baseRevisionContent, int outcomeLen, List<PatchRecord> patch) throws IOException {
3
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530 int last = 0, destIndex = 0;
43
1b26247d7367 Calculate result length of the patch operarion, when unknown
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531 if (outcomeLen == -1) {
158
b413b16d10a5 Integer offsets and file length explictly, rather than casts throughout code. Inflater may benefit from total length hint, but shall calculate it by its own if needed
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diff changeset
532 outcomeLen = baseRevisionContent.length();
263
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533 for (int i = 0, x = patch.size(); i < x; i++) {
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534 PatchRecord pr = patch.get(i);
43
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535 outcomeLen += pr.start - last + pr.len;
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diff changeset
536 last = pr.end;
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537 }
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538 outcomeLen -= last;
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diff changeset
539 last = 0;
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diff changeset
540 }
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diff changeset
541 byte[] rv = new byte[outcomeLen];
263
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diff changeset
542 for (int i = 0, x = patch.size(); i < x; i++) {
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diff changeset
543 PatchRecord pr = patch.get(i);
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
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544 baseRevisionContent.seek(last);
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diff changeset
545 baseRevisionContent.readBytes(rv, destIndex, pr.start-last);
3
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diff changeset
546 destIndex += pr.start - last;
43
1b26247d7367 Calculate result length of the patch operarion, when unknown
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diff changeset
547 System.arraycopy(pr.data, 0, rv, destIndex, pr.data.length);
3
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diff changeset
548 destIndex += pr.data.length;
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diff changeset
549 last = pr.end;
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diff changeset
550 }
51
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diff changeset
551 baseRevisionContent.seek(last);
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parents: 49
diff changeset
552 baseRevisionContent.readBytes(rv, destIndex, (int) (baseRevisionContent.length() - last));
3
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diff changeset
553 return rv;
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554 }
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diff changeset
555
35
6061aa826a9e Complete parsing of the bundle format
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
556 // @see http://mercurial.selenic.com/wiki/BundleFormat, in Changelog group description
77
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diff changeset
557 public static class PatchRecord {
52
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diff changeset
558 /*
30bd38978846 brief explanation of patch record
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diff changeset
559 Given there are pr1 and pr2:
30bd38978846 brief explanation of patch record
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parents: 49
diff changeset
560 pr1.start to pr1.end will be replaced with pr's data (of pr1.len)
30bd38978846 brief explanation of patch record
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parents: 49
diff changeset
561 pr1.end to pr2.start gets copied from base
30bd38978846 brief explanation of patch record
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diff changeset
562 */
77
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diff changeset
563 public int start, end, len;
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diff changeset
564 public byte[] data;
3
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parents: 2
diff changeset
565
36
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parents: 35
diff changeset
566 // TODO consider PatchRecord that only records data position (absolute in data source), and acquires data as needed
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diff changeset
567 private PatchRecord(int p1, int p2, int length, byte[] src) {
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diff changeset
568 start = p1;
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diff changeset
569 end = p2;
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diff changeset
570 len = length;
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parents: 35
diff changeset
571 data = src;
3
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parents: 2
diff changeset
572 }
36
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diff changeset
573
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diff changeset
574 /*package-local*/ static PatchRecord read(byte[] data, int offset) {
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diff changeset
575 final int x = offset; // shorthand
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diff changeset
576 int p1 = ((data[x] & 0xFF)<< 24) | ((data[x+1] & 0xFF) << 16) | ((data[x+2] & 0xFF) << 8) | (data[x+3] & 0xFF);
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parents: 35
diff changeset
577 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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parents: 35
diff changeset
578 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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parents: 35
diff changeset
579 byte[] dataCopy = new byte[len];
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parents: 35
diff changeset
580 System.arraycopy(data, x+12, dataCopy, 0, len);
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parents: 35
diff changeset
581 return new PatchRecord(p1, p2, len, dataCopy);
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parents: 35
diff changeset
582 }
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parents: 35
diff changeset
583
77
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diff changeset
584 public /*for HgBundle*/ static PatchRecord read(DataAccess da) throws IOException {
36
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diff changeset
585 int p1 = da.readInt();
205f9b59b400 Strip parsing logic out from console frontend
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diff changeset
586 int p2 = da.readInt();
205f9b59b400 Strip parsing logic out from console frontend
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parents: 35
diff changeset
587 int len = da.readInt();
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diff changeset
588 byte[] src = new byte[len];
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diff changeset
589 da.readBytes(src, 0, len);
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
590 return new PatchRecord(p1, p2, len, src);
205f9b59b400 Strip parsing logic out from console frontend
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diff changeset
591 }
77
c677e1593919 Moved RevlogStream implementation into .internal
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parents: 74
diff changeset
592 }
c677e1593919 Moved RevlogStream implementation into .internal
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 74
diff changeset
593
c677e1593919 Moved RevlogStream implementation into .internal
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 74
diff changeset
594 // FIXME byte[] data might be too expensive, for few usecases it may be better to have intermediate Access object (when we don't need full data
c677e1593919 Moved RevlogStream implementation into .internal
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parents: 74
diff changeset
595 // instantly - e.g. calculate hash, or comparing two revisions
c677e1593919 Moved RevlogStream implementation into .internal
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 74
diff changeset
596 public interface Inspector {
c677e1593919 Moved RevlogStream implementation into .internal
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parents: 74
diff changeset
597 // XXX boolean retVal to indicate whether to continue?
157
d5268ca7715b Merged branch wrap-data-access into default for resource-friendly data access. Updated API to promote that friendliness to clients (channels, not byte[]). More exceptions
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 53 102
diff changeset
598 // TODO specify nodeid and data length, and reuse policy (i.e. if revlog stream doesn't reuse nodeid[] for each call)
d5268ca7715b Merged branch wrap-data-access into default for resource-friendly data access. Updated API to promote that friendliness to clients (channels, not byte[]). More exceptions
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 53 102
diff changeset
599 // implementers shall not invoke DataAccess.done(), it's accomplished by #iterate at appropraite moment
d5268ca7715b Merged branch wrap-data-access into default for resource-friendly data access. Updated API to promote that friendliness to clients (channels, not byte[]). More exceptions
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 53 102
diff changeset
600 void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[/*20*/] nodeid, DataAccess data);
3
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parents: 2
diff changeset
601 }
0
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
602 }