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annotate src/com/tmate/hgkit/ll/RevlogStream.java @ 6:5abe5af181bd

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author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 22 Dec 2010 03:33:37 +0100
parents fc265ddeab26
children d6d2a630f4a6
rev   line source
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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.BufferedInputStream;
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9 import java.io.DataInput;
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10 import java.io.DataInputStream;
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11 import java.io.EOFException;
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12 import java.io.File;
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13 import java.io.FileInputStream;
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14 import java.io.FileNotFoundException;
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15 import java.io.IOException;
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16 import java.util.ArrayList;
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17 import java.util.Collections;
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18 import java.util.LinkedList;
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19 import java.util.List;
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20 import java.util.zip.DataFormatException;
2
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21 import java.util.zip.Inflater;
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22
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23 /**
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24 * ? Single RevlogStream per file per repository with accessor to record access session (e.g. with back/forward operations),
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25 * or numerous RevlogStream with separate representation of the underlaying data (cached, lazy ChunkStream)?
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26 * @author artem
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27 * @see http://mercurial.selenic.com/wiki/Revlog
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28 * @see http://mercurial.selenic.com/wiki/RevlogNG
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29 */
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30 public class RevlogStream {
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31
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32 private List<IndexEntry> index; // indexed access highly needed
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33 private boolean inline = false;
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34 private final File indexFile;
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35
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36 RevlogStream(File indexFile) {
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37 this.indexFile = indexFile;
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38 }
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39
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40 private void detectVersion() {
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41
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42 }
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43
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44 /*package*/ DataInput getIndexStream() {
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45 DataInputStream dis = null;
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46 try {
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47 dis = new DataInputStream(new BufferedInputStream(new FileInputStream(indexFile)));
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48 } catch (FileNotFoundException ex) {
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49 ex.printStackTrace();
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50 // should not happen, we checked for existence
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51 }
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52 return dis;
0
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53 }
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54
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55 /*package*/ DataInput getDataStream() {
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56 final String indexName = indexFile.getName();
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57 File dataFile = new File(indexFile.getParentFile(), indexName.substring(0, indexName.length() - 1) + "d");
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58 try {
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59 return new DataInputStream(new BufferedInputStream(new FileInputStream(dataFile)));
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60 } catch (FileNotFoundException ex) {
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61 ex.printStackTrace();
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62 return null;
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63 }
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64 }
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65
2
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66 public int revisionCount() {
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67 initOutline();
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68 return index.size();
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69 }
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70
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71 // should be possible to use TIP, ALL, or -1, -2, -n notation of Hg
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72 // ? boolean needsNodeid
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73 public void iterate(int start, int end, boolean needData, Revlog.Inspector inspector) {
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74 initOutline();
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75 final int indexSize = index.size();
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76 if (indexSize == 0) {
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77 return;
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78 }
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79 if (end == TIP) {
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80 end = indexSize - 1;
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81 }
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82 if (start == TIP) {
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83 start = indexSize - 1;
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84 }
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85 if (start < 0 || start >= indexSize) {
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86 throw new IllegalArgumentException("Bad left range boundary " + start);
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87 }
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88 if (end < start || end >= indexSize) {
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89 throw new IllegalArgumentException("Bad right range boundary " + end);
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90 }
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91 // XXX may cache [start .. end] from index with a single read (pre-read)
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92
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93 DataInput diIndex = null, diData = null;
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94 diIndex = getIndexStream();
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95 if (needData && !inline) {
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96 diData = getDataStream();
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97 }
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98 try {
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99 byte[] lastData = null;
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100 int i;
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101 boolean extraReadsToBaseRev = false;
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102 if (needData && index.get(start).baseRevision < start) {
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103 i = index.get(start).baseRevision;
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104 extraReadsToBaseRev = true;
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105 } else {
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106 i = start;
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107 }
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108 diIndex.skipBytes(inline ? (int) index.get(i).offset : start * 64);
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109 for (; i <= end; i++ ) {
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110 long l = diIndex.readLong();
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111 long offset = l >>> 16;
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112 int flags = (int) (l & 0X0FFFF);
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113 int compressedLen = diIndex.readInt();
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114 int actualLen = diIndex.readInt();
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115 int baseRevision = diIndex.readInt();
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116 int linkRevision = diIndex.readInt();
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117 int parent1Revision = diIndex.readInt();
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118 int parent2Revision = diIndex.readInt();
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119 byte[] buf = new byte[32];
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120 // XXX Hg keeps 12 last bytes empty, we move them into front here
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121 diIndex.readFully(buf, 12, 20);
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122 diIndex.skipBytes(12);
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123 byte[] data = null;
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124 if (needData) {
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125 byte[] dataBuf = new byte[compressedLen];
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126 if (inline) {
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127 diIndex.readFully(dataBuf);
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128 } else {
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129 diData.skipBytes((int) index.get(i).offset); // FIXME not skip but seek!!! (skip would work only for the first time)
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130 diData.readFully(dataBuf);
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131 }
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132 if (dataBuf[0] == 0x78 /* 'x' */) {
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133 try {
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134 Inflater zlib = new Inflater();
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135 zlib.setInput(dataBuf, 0, compressedLen);
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136 byte[] result = new byte[actualLen*2]; // FIXME need to use zlib.finished() instead
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137 int resultLen = zlib.inflate(result);
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138 zlib.end();
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139 data = new byte[resultLen];
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140 System.arraycopy(result, 0, data, 0, resultLen);
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141 } catch (DataFormatException ex) {
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142 ex.printStackTrace();
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143 data = new byte[0]; // FIXME need better failure strategy
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144 }
2
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145 } else if (dataBuf[0] == 0x75 /* 'u' */) {
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146 data = new byte[dataBuf.length - 1];
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147 System.arraycopy(dataBuf, 1, data, 0, data.length);
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148 } else {
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149 // XXX Python impl in fact throws exception when there's not 'x', 'u' or '0'
3
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150 // but I don't see reason not to return data as is
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151 data = dataBuf;
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152 }
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153 // XXX
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154 if (baseRevision != i) { // XXX not sure if this is the right way to detect a patch
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155 // this is a patch
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156 LinkedList<PatchRecord> patches = new LinkedList<PatchRecord>();
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157 int patchElementIndex = 0;
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158 do {
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159 final int x = patchElementIndex; // shorthand
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160 int p1 = ((data[x] & 0xFF)<< 24) | ((data[x+1] & 0xFF) << 16) | ((data[x+2] & 0xFF) << 8) | (data[x+3] & 0xFF);
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161 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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162 int len = ((data[x+8] & 0xFF) << 24) | ((data[x+9] & 0xFF) << 16) | ((data[x+10] & 0xFF) << 8) | (data[x+11] & 0xFF);
3
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163 patchElementIndex += 12 + len;
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164 patches.add(new PatchRecord(p1, p2, len, data, x+12));
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165 } while (patchElementIndex < data.length);
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166 //
5
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167 byte[] baseRevContent = lastData;
6
5abe5af181bd Ant script to build commands and run sample
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168 data = apply(baseRevContent, actualLen, patches);
3
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169 }
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170 } else {
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171 if (inline) {
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172 diIndex.skipBytes(compressedLen);
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173 }
2
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174 }
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175 if (!extraReadsToBaseRev || i >= start) {
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176 inspector.next(i, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, buf, data);
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177 }
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178 lastData = data;
2
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179 }
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180 } catch (EOFException ex) {
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181 // should not happen as long as we read inside known boundaries
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182 throw new IllegalStateException(ex);
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183 } catch (IOException ex) {
3
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184 throw new IllegalStateException(ex); // FIXME need better handling
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185 } finally {
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186 hackCloseFileStreams(diIndex, diData); // FIXME HACK!!!
2
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187 }
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188 }
0
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189
2
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190 private void initOutline() {
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191 if (index != null && !index.isEmpty()) {
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192 return;
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193 }
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194 ArrayList<IndexEntry> res = new ArrayList<IndexEntry>();
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195 DataInput di = getIndexStream();
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196 try {
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197 int versionField = di.readInt();
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198 di.readInt(); // just to skip next 2 bytes of offset + flags
2
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199 final int INLINEDATA = 1 << 16;
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200 inline = (versionField & INLINEDATA) != 0;
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201 long offset = 0; // first offset is always 0, thus Hg uses it for other purposes
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202 while(true) { // EOFExcepiton should get us outta here. FIXME Our inputstream should has explicit no-more-data indicator
2
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203 int compressedLen = di.readInt();
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204 // 8+4 = 12 bytes total read here
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205 int actualLen = di.readInt();
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206 int baseRevision = di.readInt();
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207 // 12 + 8 = 20 bytes read here
2
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208 // int linkRevision = di.readInt();
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209 // int parent1Revision = di.readInt();
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210 // int parent2Revision = di.readInt();
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211 // byte[] nodeid = new byte[32];
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212 if (inline) {
5
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diff changeset
213 res.add(new IndexEntry(offset + 64*res.size(), baseRevision));
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diff changeset
214 di.skipBytes(3*4 + 32 + compressedLen); // Check: 44 (skip) + 20 (read) = 64 (total RevlogNG record size)
2
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215 } else {
5
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diff changeset
216 res.add(new IndexEntry(offset, baseRevision));
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diff changeset
217 di.skipBytes(3*4 + 32);
2
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diff changeset
218 }
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219 long l = di.readLong();
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220 offset = l >>> 16;
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221 }
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222 } catch (EOFException ex) {
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223 // fine, done then
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224 index = res;
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225 } catch (IOException ex) {
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226 ex.printStackTrace();
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227 // too bad, no outline then
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228 index = Collections.emptyList();
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229 }
3
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diff changeset
230 hackCloseFileStreams(di, null); // FIXME HACK!!!
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diff changeset
231 }
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232
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233 // FIXME HACK to deal with File/FileStream nature of out data source. Won't need this once implement
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diff changeset
234 // own DataInput based on bytearray chunks or RandomAccessFile
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diff changeset
235 private void hackCloseFileStreams(DataInput index, DataInput data) {
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diff changeset
236 try {
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237 if (index != null) {
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diff changeset
238 ((DataInputStream) index).close();
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239 }
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diff changeset
240 if (data != null) {
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diff changeset
241 ((DataInputStream) data).close();
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242 }
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243 } catch (IOException ex) {
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244 ex.printStackTrace();
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245 }
2
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246 }
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diff changeset
247
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diff changeset
248
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249 // perhaps, package-local or protected, if anyone else from low-level needs them
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diff changeset
250 // 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?
2
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diff changeset
251 private static class IndexEntry {
4
aa1912c70b36 Fix offset issue for inline revlogs. Commandline processing.
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diff changeset
252 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))
5
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diff changeset
253 //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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diff changeset
254 public final int baseRevision;
2
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diff changeset
255
5
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diff changeset
256 public IndexEntry(long o, int baseRev) {
2
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diff changeset
257 offset = o;
5
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diff changeset
258 baseRevision = baseRev;
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259 }
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260 }
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261
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262 // mpatch.c : apply()
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263 // 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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264 private static byte[] apply(byte[] baseRevisionContent, int outcomeLen, List<PatchRecord> patch) {
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265 byte[] tempBuf = new byte[outcomeLen]; // XXX
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266 int last = 0, destIndex = 0;
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267 for (PatchRecord pr : patch) {
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268 System.arraycopy(baseRevisionContent, last, tempBuf, destIndex, pr.start-last);
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269 destIndex += pr.start - last;
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270 System.arraycopy(pr.data, 0, tempBuf, destIndex, pr.data.length);
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271 destIndex += pr.data.length;
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272 last = pr.end;
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273 }
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274 System.arraycopy(baseRevisionContent, last, tempBuf, destIndex, baseRevisionContent.length - last);
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275 destIndex += baseRevisionContent.length - last; // total length
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276 byte[] rv = new byte[destIndex];
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277 System.arraycopy(tempBuf, 0, rv, 0, destIndex);
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278 return rv;
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279 }
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280
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281 static class PatchRecord { // copy of struct frag from mpatch.c
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282 int start, end, len;
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283 byte[] data;
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284
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285 public PatchRecord(int p1, int p2, int len, byte[] src, int srcOffset) {
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286 start = p1;
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287 end = p2;
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288 this.len = len;
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289 data = new byte[len];
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290 System.arraycopy(src, srcOffset, data, 0, len);
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291 }
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292 }
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293
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294 }