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annotate src/com/tmate/hgkit/ll/RevlogStream.java @ 10:382cfe9463db

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Dirstate parsing. DataAccess refactored to allow reuse and control over constants
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sat, 25 Dec 2010 21:50:12 +0100
parents d6d2a630f4a6
children 603806cd2dc6
rev   line source
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382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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1 /*
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2 * Copyright (c) 2010 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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16
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17 import com.tmate.hgkit.fs.DataAccess;
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18 import com.tmate.hgkit.fs.DataAccessProvider;
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19
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20 /**
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21 * ? Single RevlogStream per file per repository with accessor to record access session (e.g. with back/forward operations),
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22 * or numerous RevlogStream with separate representation of the underlaying data (cached, lazy ChunkStream)?
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23 * @author artem
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24 * @see http://mercurial.selenic.com/wiki/Revlog
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25 * @see http://mercurial.selenic.com/wiki/RevlogNG
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26 */
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27 public class RevlogStream {
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28
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29 private List<IndexEntry> index; // indexed access highly needed
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30 private boolean inline = false;
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31 private final File indexFile;
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32 private final DataAccessProvider dataAccess;
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33
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34 // if we need anything else from HgRepo, might replace DAP parameter with HgRepo and query it for DAP.
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35 RevlogStream(DataAccessProvider dap, File indexFile) {
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36 this.dataAccess = dap;
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37 this.indexFile = indexFile;
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38 }
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39
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40 /*package*/ DataAccess getIndexStream() {
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41 return dataAccess.create(indexFile);
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42 }
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43
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44 /*package*/ DataAccess getDataStream() {
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45 final String indexName = indexFile.getName();
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46 File dataFile = new File(indexFile.getParentFile(), indexName.substring(0, indexName.length() - 1) + "d");
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47 return dataAccess.create(dataFile);
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48 }
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49
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50 public int revisionCount() {
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51 initOutline();
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52 return index.size();
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53 }
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54
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55 private final int REVLOGV1_RECORD_SIZE = 64;
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56
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57 // should be possible to use TIP, ALL, or -1, -2, -n notation of Hg
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58 // ? boolean needsNodeid
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59 public void iterate(int start, int end, boolean needData, Revlog.Inspector inspector) {
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60 initOutline();
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61 final int indexSize = index.size();
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62 if (indexSize == 0) {
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63 return;
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64 }
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65 if (end == TIP) {
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66 end = indexSize - 1;
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67 }
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68 if (start == TIP) {
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69 start = indexSize - 1;
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70 }
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71 if (start < 0 || start >= indexSize) {
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72 throw new IllegalArgumentException("Bad left range boundary " + start);
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73 }
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74 if (end < start || end >= indexSize) {
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75 throw new IllegalArgumentException("Bad right range boundary " + end);
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76 }
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77 // XXX may cache [start .. end] from index with a single read (pre-read)
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78
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79 DataAccess daIndex = null, daData = null;
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80 daIndex = getIndexStream();
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81 if (needData && !inline) {
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82 daData = getDataStream();
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83 }
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84 try {
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85 byte[] lastData = null;
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86 int i;
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87 boolean extraReadsToBaseRev = false;
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88 if (needData && index.get(start).baseRevision < start) {
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89 i = index.get(start).baseRevision;
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90 extraReadsToBaseRev = true;
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91 } else {
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92 i = start;
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93 }
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95 daIndex.seek(inline ? (int) index.get(i).offset : start * REVLOGV1_RECORD_SIZE);
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96 for (; i <= end; i++ ) {
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97 long l = daIndex.readLong();
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98 long offset = l >>> 16;
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99 int flags = (int) (l & 0X0FFFF);
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100 int compressedLen = daIndex.readInt();
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101 int actualLen = daIndex.readInt();
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102 int baseRevision = daIndex.readInt();
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103 int linkRevision = daIndex.readInt();
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104 int parent1Revision = daIndex.readInt();
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105 int parent2Revision = daIndex.readInt();
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106 byte[] buf = new byte[32];
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107 // XXX Hg keeps 12 last bytes empty, we move them into front here
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108 daIndex.readBytes(buf, 12, 20);
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109 daIndex.skip(12);
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110 byte[] data = null;
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111 if (needData) {
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112 byte[] dataBuf = new byte[compressedLen];
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113 if (inline) {
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114 daIndex.readBytes(dataBuf, 0, compressedLen);
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115 } else {
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116 daData.seek(index.get(i).offset);
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117 daData.readBytes(dataBuf, 0, compressedLen);
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118 }
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119 if (dataBuf[0] == 0x78 /* 'x' */) {
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120 try {
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121 Inflater zlib = new Inflater();
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122 zlib.setInput(dataBuf, 0, compressedLen);
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123 byte[] result = new byte[actualLen*2]; // FIXME need to use zlib.finished() instead
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124 int resultLen = zlib.inflate(result);
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125 zlib.end();
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126 data = new byte[resultLen];
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127 System.arraycopy(result, 0, data, 0, resultLen);
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128 } catch (DataFormatException ex) {
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129 ex.printStackTrace();
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130 data = new byte[0]; // FIXME need better failure strategy
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131 }
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132 } else if (dataBuf[0] == 0x75 /* 'u' */) {
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133 data = new byte[dataBuf.length - 1];
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134 System.arraycopy(dataBuf, 1, data, 0, data.length);
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135 } else {
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136 // XXX Python impl in fact throws exception when there's not 'x', 'u' or '0'
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137 // but I don't see reason not to return data as is
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138 data = dataBuf;
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139 }
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140 // XXX
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141 if (baseRevision != i) { // XXX not sure if this is the right way to detect a patch
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142 // this is a patch
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143 LinkedList<PatchRecord> patches = new LinkedList<PatchRecord>();
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144 int patchElementIndex = 0;
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145 do {
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146 final int x = patchElementIndex; // shorthand
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147 int p1 = ((data[x] & 0xFF)<< 24) | ((data[x+1] & 0xFF) << 16) | ((data[x+2] & 0xFF) << 8) | (data[x+3] & 0xFF);
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148 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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149 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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150 patchElementIndex += 12 + len;
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151 patches.add(new PatchRecord(p1, p2, len, data, x+12));
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152 } while (patchElementIndex < data.length);
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153 //
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154 byte[] baseRevContent = lastData;
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155 data = apply(baseRevContent, actualLen, patches);
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156 }
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157 } else {
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158 if (inline) {
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159 daIndex.skip(compressedLen);
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160 }
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161 }
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162 if (!extraReadsToBaseRev || i >= start) {
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163 inspector.next(i, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, buf, data);
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164 }
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165 lastData = data;
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166 }
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167 } catch (IOException ex) {
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168 throw new IllegalStateException(ex); // FIXME need better handling
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169 } finally {
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170 daIndex.done();
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171 if (daData != null) {
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172 daData.done();
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173 }
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174 }
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175 }
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176
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177 private void initOutline() {
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178 if (index != null && !index.isEmpty()) {
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179 return;
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180 }
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181 ArrayList<IndexEntry> res = new ArrayList<IndexEntry>();
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182 DataAccess da = getIndexStream();
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183 try {
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184 int versionField = da.readInt();
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185 da.readInt(); // just to skip next 2 bytes of offset + flags
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186 final int INLINEDATA = 1 << 16;
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187 inline = (versionField & INLINEDATA) != 0;
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188 long offset = 0; // first offset is always 0, thus Hg uses it for other purposes
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189 while(true) {
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190 int compressedLen = da.readInt();
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191 // 8+4 = 12 bytes total read here
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192 int actualLen = da.readInt();
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193 int baseRevision = da.readInt();
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194 // 12 + 8 = 20 bytes read here
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195 // int linkRevision = di.readInt();
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196 // int parent1Revision = di.readInt();
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197 // int parent2Revision = di.readInt();
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198 // byte[] nodeid = new byte[32];
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199 if (inline) {
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200 res.add(new IndexEntry(offset + REVLOGV1_RECORD_SIZE * res.size(), baseRevision));
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201 da.skip(3*4 + 32 + compressedLen); // Check: 44 (skip) + 20 (read) = 64 (total RevlogNG record size)
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202 } else {
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203 res.add(new IndexEntry(offset, baseRevision));
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204 da.skip(3*4 + 32);
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205 }
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206 if (da.isEmpty()) {
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207 // fine, done then
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208 index = res;
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209 break;
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210 } else {
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211 // start reading next record
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212 long l = da.readLong();
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213 offset = l >>> 16;
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214 }
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215 }
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216 } catch (IOException ex) {
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217 ex.printStackTrace(); // log error
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218 // too bad, no outline then.
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219 index = Collections.emptyList();
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220 } finally {
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221 da.done();
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222 }
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223
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224 }
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225
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226
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227 // perhaps, package-local or protected, if anyone else from low-level needs them
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228 // 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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229 private static class IndexEntry {
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230 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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231 //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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232 public final int baseRevision;
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233
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234 public IndexEntry(long o, int baseRev) {
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235 offset = o;
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236 baseRevision = baseRev;
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237 }
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238 }
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239
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240 // mpatch.c : apply()
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241 // 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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242 private static byte[] apply(byte[] baseRevisionContent, int outcomeLen, List<PatchRecord> patch) {
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243 byte[] tempBuf = new byte[outcomeLen]; // XXX
3
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244 int last = 0, destIndex = 0;
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245 for (PatchRecord pr : patch) {
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246 System.arraycopy(baseRevisionContent, last, tempBuf, destIndex, pr.start-last);
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247 destIndex += pr.start - last;
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248 System.arraycopy(pr.data, 0, tempBuf, destIndex, pr.data.length);
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249 destIndex += pr.data.length;
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250 last = pr.end;
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251 }
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252 System.arraycopy(baseRevisionContent, last, tempBuf, destIndex, baseRevisionContent.length - last);
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253 destIndex += baseRevisionContent.length - last; // total length
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254 byte[] rv = new byte[destIndex];
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255 System.arraycopy(tempBuf, 0, rv, 0, destIndex);
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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256 return rv;
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257 }
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258
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259 static class PatchRecord { // copy of struct frag from mpatch.c
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260 int start, end, len;
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261 byte[] data;
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262
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263 public PatchRecord(int p1, int p2, int len, byte[] src, int srcOffset) {
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264 start = p1;
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265 end = p2;
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266 this.len = len;
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267 data = new byte[len];
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268 System.arraycopy(src, srcOffset, data, 0, len);
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269 }
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270 }
0
dbd663faec1f Basic changelog parsing
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271 }