Mercurial > jhg

annotate src/com/tmate/hgkit/ll/RevlogStream.java @ 2:08db726a0fb7

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Shaping out low-level Hg structures
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sun, 19 Dec 2010 05:41:31 +0100
parents dbd663faec1f
children 24bb4f365164
rev   line source
0
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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 java.io.DataInput;
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7 import java.io.EOFException;
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8 import java.io.IOException;
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9 import java.util.ArrayList;
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10 import java.util.Collections;
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11 import java.util.List;
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12 import java.util.zip.Inflater;
0
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13
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14 /**
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15 * ? Single RevlogStream per file per repository with accessor to record access session (e.g. with back/forward operations),
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16 * or numerous RevlogStream with separate representation of the underlaying data (cached, lazy ChunkStream)?
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17 * @author artem
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18 * @see http://mercurial.selenic.com/wiki/Revlog
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19 * @see http://mercurial.selenic.com/wiki/RevlogNG
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20 */
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21 public class RevlogStream {
2
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22
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23 private List<IndexEntry> index; // indexed access highly needed
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24 private boolean inline = false;
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25
0
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26 private void detectVersion() {
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27
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28 }
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29
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30 /*package*/ DataInput getIndexStream() {
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31 // TODO Auto-generated method stub
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32 return null;
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33 }
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34
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35 /*package*/ DataInput getDataStream() {
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36 // TODO Auto-generated method stub
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37 return null;
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38 }
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39 public int revisionCount() {
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40 initOutline();
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41 return index.size();
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42 }
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43
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44 // should be possible to use TIP, ALL
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45 public void iterate(int start, int end, boolean needData, Revlog.Inspector inspector) {
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46 initOutline();
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47 final int indexSize = index.size();
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48 if (start < 0 || start >= indexSize) {
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49 throw new IllegalArgumentException("Bad left range boundary " + start);
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50 }
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51 if (end < start || end >= indexSize) {
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52 throw new IllegalArgumentException("Bad right range boundary " + end);
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53 }
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54 // XXX may cache [start .. end] from index with a single read (pre-read)
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55
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56 DataInput diIndex = null, diData = null;
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57 diIndex = getIndexStream();
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58 if (needData) {
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59 diData = getDataStream();
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60 }
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61 try {
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62 diIndex.skipBytes(inline ? (int) index.get(start).offset : start * 64);
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63 for (int i = start; i <= end && i < indexSize; i++ ) {
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64 IndexEntry ie = index.get(i);
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65 long l = diIndex.readLong();
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66 long offset = l >>> 16;
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67 int flags = (int) (l & 0X0FFFF);
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68 int compressedLen = diIndex.readInt();
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69 int actualLen = diIndex.readInt();
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70 int baseRevision = diIndex.readInt();
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71 int linkRevision = diIndex.readInt();
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72 int parent1Revision = diIndex.readInt();
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73 int parent2Revision = diIndex.readInt();
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74 byte[] buf = new byte[32];
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75 // XXX Hg keeps 12 last bytes empty, we move them into front here
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76 diIndex.readFully(buf, 12, 20);
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77 diIndex.skipBytes(12);
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78 byte[] data = null;
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79 if (needData) {
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80 byte[] dataBuf = new byte[compressedLen];
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81 if (inline) {
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82 diIndex.readFully(dataBuf);
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83 } else {
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84 diData.skipBytes((int) ie.offset); // FIXME not skip but seek!!!
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85 diData.readFully(dataBuf);
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86 }
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87 if (dataBuf[0] == 0x78 /* 'x' */) {
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88 Inflater zlib = new Inflater();
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89 zlib.setInput(dataBuf, 0, compressedLen);
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90 byte[] result = new byte[actualLen*2]; // FIXME need to use zlib.finished() instead
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91 int resultLen = zlib.inflate(result);
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92 zlib.end();
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93 data = new byte[resultLen];
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94 System.arraycopy(result, 0, data, 0, resultLen);
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95 } else if (dataBuf[0] == 0x75 /* 'u' */) {
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96 data = new byte[dataBuf.length - 1];
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97 System.arraycopy(dataBuf, 1, data, 0, data.length);
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98 } else {
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99 // XXX Python impl in fact throws exception when there's not 'x', 'u' or '0'
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100 // but I don't see reason not to just return data as is
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101 data = dataBuf;
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102 }
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103 // FIXME if patch data (based on baseRevision), then apply patches to get true content
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104 }
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105 inspector.next(compressedLen, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, buf, data);
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106 }
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107 } catch (EOFException ex) {
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108 // should not happen as long as we read inside known boundaries
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109 throw new IllegalStateException(ex);
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110 } catch (IOException ex) {
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111 FIXME
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112 }
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113 }
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114
2
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115 private void initOutline() {
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116 if (index != null && !index.isEmpty()) {
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117 return;
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118 }
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119 ArrayList<IndexEntry> res = new ArrayList<IndexEntry>();
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120 DataInput di = getIndexStream();
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121 try {
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122 int versionField = di.readInt();
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123 // di.undreadInt();
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124 final int INLINEDATA = 1 << 16;
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125 inline = (versionField & INLINEDATA) != 0;
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126 long offset = 0; // first offset is always 0, thus Hg uses it for other purposes
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127 while(true) { // EOFExcepiton should get us outta here. FIXME Out inputstream should has explicit no-more-data indicator
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128 int compressedLen = di.readInt();
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129 // 8+4 = 12 bytes total read
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130 // int actualLen = di.readInt();
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131 // int baseRevision = di.readInt();
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132 // int linkRevision = di.readInt();
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133 // int parent1Revision = di.readInt();
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134 // int parent2Revision = di.readInt();
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135 // byte[] nodeid = new byte[32];
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136 res.add(new IndexEntry(offset, compressedLen));
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137 if (inline) {
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138 di.skipBytes(6*4 + 32 + compressedLen); // Check: 56 (skip) + 12 (read) = 64 (total RevlogNG record size)
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139 } else {
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140 di.skipBytes(6*4 + 32);
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141 }
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142 long l = di.readLong();
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143 offset = l >>> 16;
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144 }
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145 } catch (EOFException ex) {
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146 // fine, done then
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147 index = res;
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148 } catch (IOException ex) {
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149 ex.printStackTrace();
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150 // too bad, no outline then
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151 index = Collections.emptyList();
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152 }
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153 }
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154
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155
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156 // perhaps, package-local or protected, if anyone else from low-level needs them
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157 private static class IndexEntry {
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158 public final long offset;
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159 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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160
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161 public IndexEntry(long o, int l) {
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162 offset = o;
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163 length = l;
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164 }
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165 }
0
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166 }