Mercurial > jhg

annotate src/com/tmate/hgkit/ll/RevlogStream.java @ 3:24bb4f365164

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Rudimentary log functionality with basic infrastructure is in place
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 20 Dec 2010 02:50:36 +0100
parents 08db726a0fb7
children aa1912c70b36
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
3
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6 import java.io.BufferedInputStream;
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7 import java.io.DataInput;
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8 import java.io.DataInputStream;
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9 import java.io.EOFException;
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10 import java.io.File;
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11 import java.io.FileInputStream;
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12 import java.io.FileNotFoundException;
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13 import java.io.IOException;
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14 import java.util.ArrayList;
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15 import java.util.Collections;
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16 import java.util.LinkedList;
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17 import java.util.List;
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18 import java.util.zip.DataFormatException;
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19 import java.util.zip.Inflater;
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20
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21 /**
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22 * ? Single RevlogStream per file per repository with accessor to record access session (e.g. with back/forward operations),
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23 * or numerous RevlogStream with separate representation of the underlaying data (cached, lazy ChunkStream)?
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24 * @author artem
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25 * @see http://mercurial.selenic.com/wiki/Revlog
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26 * @see http://mercurial.selenic.com/wiki/RevlogNG
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27 */
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28 public class RevlogStream {
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29
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30 private List<IndexEntry> index; // indexed access highly needed
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31 private boolean inline = false;
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32 private final File indexFile;
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33
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34 RevlogStream(File indexFile) {
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35 this.indexFile = indexFile;
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36 }
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37
0
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38 private void detectVersion() {
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39
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40 }
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41
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42 /*package*/ DataInput getIndexStream() {
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43 DataInputStream dis = null;
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44 try {
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45 dis = new DataInputStream(new BufferedInputStream(new FileInputStream(indexFile)));
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46 } catch (FileNotFoundException ex) {
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47 ex.printStackTrace();
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48 // should not happen, we checked for existence
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49 }
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50 return dis;
0
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51 }
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52
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53 /*package*/ DataInput getDataStream() {
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54 final String indexName = indexFile.getName();
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55 File dataFile = new File(indexFile.getParentFile(), indexName.substring(0, indexName.length() - 1) + "d");
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56 try {
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57 return new DataInputStream(new BufferedInputStream(new FileInputStream(dataFile)));
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58 } catch (FileNotFoundException ex) {
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59 ex.printStackTrace();
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60 return null;
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61 }
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62 }
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63
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64 public int revisionCount() {
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65 initOutline();
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66 return index.size();
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67 }
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68
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69 // should be possible to use TIP, ALL, or -1, -2, -n notation of Hg
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70 // ? boolean needsNodeid
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71 public void iterate(int start, int end, boolean needData, Revlog.Inspector inspector) {
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72 initOutline();
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73 final int indexSize = index.size();
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74 if (indexSize == 0) {
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75 return;
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76 }
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77 if (end == -1 /*FIXME TIP*/) {
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78 end = indexSize - 1;
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79 }
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80 if (start < 0 || start >= indexSize) {
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81 throw new IllegalArgumentException("Bad left range boundary " + start);
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82 }
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83 if (end < start || end >= indexSize) {
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84 throw new IllegalArgumentException("Bad right range boundary " + end);
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85 }
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86 // XXX may cache [start .. end] from index with a single read (pre-read)
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87
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88 DataInput diIndex = null, diData = null;
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89 diIndex = getIndexStream();
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90 if (needData && !inline) {
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91 diData = getDataStream();
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92 }
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93 try {
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94 diIndex.skipBytes(inline ? (int) index.get(start).offset : start * 64);
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95 byte[] lastData = null;
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96 for (int i = start; i <= end; i++ ) {
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97 IndexEntry ie = index.get(i);
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98 long l = diIndex.readLong();
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99 long offset = l >>> 16;
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100 int flags = (int) (l & 0X0FFFF);
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101 int compressedLen = diIndex.readInt();
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102 int actualLen = diIndex.readInt();
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103 int baseRevision = diIndex.readInt();
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104 int linkRevision = diIndex.readInt();
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105 int parent1Revision = diIndex.readInt();
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106 int parent2Revision = diIndex.readInt();
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107 byte[] buf = new byte[32];
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108 // XXX Hg keeps 12 last bytes empty, we move them into front here
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109 diIndex.readFully(buf, 12, 20);
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110 diIndex.skipBytes(12);
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111 byte[] data = null;
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112 if (needData) {
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113 byte[] dataBuf = new byte[compressedLen];
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114 if (inline) {
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115 diIndex.readFully(dataBuf);
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116 } else {
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117 diData.skipBytes((int) ie.offset); // FIXME not skip but seek!!! (skip would work only for the first time)
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118 diData.readFully(dataBuf);
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119 }
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120 if (dataBuf[0] == 0x78 /* 'x' */) {
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121 try {
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122 Inflater zlib = new Inflater();
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123 zlib.setInput(dataBuf, 0, compressedLen);
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124 byte[] result = new byte[actualLen*2]; // FIXME need to use zlib.finished() instead
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125 int resultLen = zlib.inflate(result);
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126 zlib.end();
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127 data = new byte[resultLen];
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128 System.arraycopy(result, 0, data, 0, resultLen);
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129 } catch (DataFormatException ex) {
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130 ex.printStackTrace();
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131 data = new byte[0]; // FIXME need better failure strategy
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132 }
2
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133 } else if (dataBuf[0] == 0x75 /* 'u' */) {
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134 data = new byte[dataBuf.length - 1];
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135 System.arraycopy(dataBuf, 1, data, 0, data.length);
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136 } else {
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137 // XXX Python impl in fact throws exception when there's not 'x', 'u' or '0'
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138 // but I don't see reason not to return data as is
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139 data = dataBuf;
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140 }
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141 // XXX
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142 if (baseRevision != i) { // XXX not sure if this is the right way to detect a patch
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143 // this is a patch
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144 LinkedList<PatchRecord> patches = new LinkedList<PatchRecord>();
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145 int patchElementIndex = 0;
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146 do {
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147 final int x = patchElementIndex; // shorthand
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148 int p1 = (data[x] << 24) | (data[x+1] << 16) | (data[x+2] << 8) | data[x+3];
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149 int p2 = (data[x+4] << 24) | (data[x+5] << 16) | (data[x+6] << 8) | data[x+7];
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150 int len = (data[x+8] << 24) | (data[x+9] << 16) | (data[x+10] << 8) | data[x+11];
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151 patchElementIndex += 12 + len;
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152 patches.add(new PatchRecord(p1, p2, len, data, x+12));
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153 } while (patchElementIndex < data.length);
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154 //
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155 byte[] baseRevContent;
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156 if (baseRevision == i - 1) {
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157 baseRevContent = lastData;
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158 } else {
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159 // FIXME implement delta collection from few revisions
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160 // read baseRevision plus all deltas between this revision and base. Need to do this effectively.
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161 throw HgRepository.notImplemented();
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162 }
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163
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164 // FIXME need to collect all patches between baseRevision and current version
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165 data = apply(baseRevContent, patches);
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166 }
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167 } else {
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168 if (inline) {
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169 diIndex.skipBytes(compressedLen);
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170 }
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171 }
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172 inspector.next(i, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, buf, data);
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173 lastData = data;
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174 }
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175 } catch (EOFException ex) {
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176 // should not happen as long as we read inside known boundaries
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177 throw new IllegalStateException(ex);
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178 } catch (IOException ex) {
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179 throw new IllegalStateException(ex); // FIXME need better handling
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180 } finally {
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181 hackCloseFileStreams(diIndex, diData); // FIXME HACK!!!
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182 }
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183 }
0
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184
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185 private void initOutline() {
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186 if (index != null && !index.isEmpty()) {
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187 return;
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188 }
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189 ArrayList<IndexEntry> res = new ArrayList<IndexEntry>();
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190 DataInput di = getIndexStream();
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191 try {
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192 int versionField = di.readInt();
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193 di.readInt(); // just to skip next 2 bytes of offset + flags
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194 final int INLINEDATA = 1 << 16;
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195 inline = (versionField & INLINEDATA) != 0;
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196 long offset = 0; // first offset is always 0, thus Hg uses it for other purposes
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197 while(true) { // EOFExcepiton should get us outta here. FIXME Our inputstream should has explicit no-more-data indicator
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198 int compressedLen = di.readInt();
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199 // 8+4 = 12 bytes total read
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200 // int actualLen = di.readInt();
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201 // int baseRevision = di.readInt();
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202 // int linkRevision = di.readInt();
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203 // int parent1Revision = di.readInt();
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204 // int parent2Revision = di.readInt();
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205 // byte[] nodeid = new byte[32];
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206 res.add(new IndexEntry(offset, compressedLen));
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207 if (inline) {
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208 di.skipBytes(5*4 + 32 + compressedLen); // Check: 52 (skip) + 12 (read) = 64 (total RevlogNG record size)
2
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209 } else {
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210 di.skipBytes(5*4 + 32);
2
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211 }
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212 long l = di.readLong();
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213 offset = l >>> 16;
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214 }
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215 } catch (EOFException ex) {
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216 // fine, done then
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217 index = res;
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218 } catch (IOException ex) {
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219 ex.printStackTrace();
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220 // too bad, no outline then
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221 index = Collections.emptyList();
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222 }
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223 hackCloseFileStreams(di, null); // FIXME HACK!!!
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224 }
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225
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226 // FIXME HACK to deal with File/FileStream nature of out data source. Won't need this once implement
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227 // own DataInput based on bytearray chunks or RandomAccessFile
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228 private void hackCloseFileStreams(DataInput index, DataInput data) {
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229 try {
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230 if (index != null) {
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231 ((DataInputStream) index).close();
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232 }
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233 if (data != null) {
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234 ((DataInputStream) data).close();
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235 }
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236 } catch (IOException ex) {
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237 ex.printStackTrace();
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238 }
2
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239 }
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240
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241
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242 // perhaps, package-local or protected, if anyone else from low-level needs them
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243 private static class IndexEntry {
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244 public final long offset;
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245 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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246
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247 public IndexEntry(long o, int l) {
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248 offset = o;
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249 length = l;
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250 }
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251 }
3
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252
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253 // mpatch.c : apply()
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254 // 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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255 private static byte[] apply(byte[] baseRevisionContent, List<PatchRecord> patch) {
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256 byte[] tempBuf = new byte[512]; // XXX
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257 int last = 0, destIndex = 0;
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258 for (PatchRecord pr : patch) {
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259 System.arraycopy(baseRevisionContent, last, tempBuf, destIndex, pr.start-last);
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260 destIndex += pr.start - last;
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261 System.arraycopy(pr.data, 0, tempBuf, destIndex, pr.data.length);
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262 destIndex += pr.data.length;
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263 last = pr.end;
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264 }
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265 System.arraycopy(baseRevisionContent, last, tempBuf, destIndex, baseRevisionContent.length - last);
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266 destIndex += baseRevisionContent.length - last; // total length
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267 byte[] rv = new byte[destIndex];
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268 System.arraycopy(tempBuf, 0, rv, 0, destIndex);
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269 return rv;
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270 }
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271
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272 static class PatchRecord { // copy of struct frag from mpatch.c
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273 int start, end, len;
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274 byte[] data;
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275
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276 public PatchRecord(int p1, int p2, int len, byte[] src, int srcOffset) {
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277 start = p1;
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278 end = p2;
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279 this.len = len;
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280 data = new byte[len];
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281 System.arraycopy(src, srcOffset, data, 0, len);
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282 }
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283 }
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284
0
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285 }