Mercurial > hg4j

annotate src/com/tmate/hgkit/console/Main.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
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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1 package com.tmate.hgkit.console;
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2
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3 import java.io.BufferedInputStream;
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4 import java.io.DataInput;
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5 import java.io.DataInputStream;
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6 import java.io.File;
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7 import java.io.FileInputStream;
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8 import java.math.BigInteger;
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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.Iterator;
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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.Deflater;
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15 import java.util.zip.Inflater;
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16
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17 import com.tmate.hgkit.ll.Changeset;
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18
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19 /**
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20 *
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21 * @author artem
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22 */
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23 public class Main {
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24
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25 public static void main(String[] args) throws Exception {
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26 LinkedList<Changeset> changelog = new LinkedList<Changeset>();
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27 //
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28 DataInputStream dis = new DataInputStream(new BufferedInputStream(new FileInputStream(new File("/temp/hg/hello/" + ".hg/store/00changelog.i"))));
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29 DataInput di = dis;
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30 dis.mark(10);
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31 int versionField = di.readInt();
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32 dis.reset();
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33 final int INLINEDATA = 1 << 16;
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34
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35 boolean inlineData = (versionField & INLINEDATA) != 0;
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36 System.out.printf("%#8x, inline: %b\n", versionField, inlineData);
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37 System.out.println("\tOffset\tFlags\tPacked\t Actual\tBase Rev Link Rev\tParent1\tParent2\tnodeid");
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38 int entryCount = 0;
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39 while (dis.available() > 0) {
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40 long l = di.readLong();
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41 long offset = l >>> 16;
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42 int flags = (int) (l & 0X0FFFF);
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43 int compressedLen = di.readInt();
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44 int actualLen = di.readInt();
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45 int baseRevision = di.readInt();
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46 int linkRevision = di.readInt();
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47 int parent1Revision = di.readInt();
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48 int parent2Revision = di.readInt();
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49 byte[] buf = new byte[32];
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50 di.readFully(buf, 12, 20);
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51 dis.skip(12);
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52 System.out.printf("%14d %6X %10d %10d %10d %10d %8d %8d %040x\n", offset, flags, compressedLen, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, new BigInteger(buf));
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53 if (inlineData) {
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54 byte[] data = new byte[compressedLen];
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55 di.readFully(data);
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56 if (data[0] == 0x78 /* 'x' */) {
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57 Inflater zlib = new Inflater();
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58 zlib.setInput(data, 0, compressedLen);
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59 byte[] result = new byte[actualLen*2];
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60 int resultLen = zlib.inflate(result);
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61 zlib.end();
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62 if (resultLen != actualLen) {
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63 System.err.printf("Expected:%d, decomressed to:%d bytes\n", actualLen, resultLen);
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64 }
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65 String resultString;
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66 if (baseRevision != entryCount) {
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67 // this is a patch
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68 byte[] baseRevContent = changelog.get(baseRevision).rawData;
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69 LinkedList<PatchRecord> bins = new LinkedList<PatchRecord>();
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70 int p1, p2, len, patchElementIndex = 0;
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71 do {
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72 final int x = patchElementIndex;
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73 p1 = (result[x] << 24) | (result[x+1] << 16) | (result[x+2] << 8) | result[x+3];
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74 p2 = (result[x+4] << 24) | (result[x+5] << 16) | (result[x+6] << 8) | result[x+7];
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75 len = (result[x+8] << 24) | (result[x+9] << 16) | (result[x+10] << 8) | result[x+11];
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76 System.out.printf("%4d %4d %4d\n", p1, p2, len);
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77 patchElementIndex += 12 + len;
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78 bins.add(new PatchRecord(p1, p2, len, result, x+12));
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79 } while (patchElementIndex < resultLen);
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80 //
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81 result = apply(baseRevContent, bins);
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82 resultLen = result.length;
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83 }
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84 resultString = new String(result, 0, resultLen, "UTF-8");
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85 System.out.println(resultString);
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86 entryCount++;
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87 Changeset changeset = new Changeset();
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88 changeset.read(result, 0, resultLen);
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89 changelog.add(changeset);
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90 } // TODO else if uncompressed
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91 }
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92 }
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93 dis.close();
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94 //
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95 System.out.println("\n\n");
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96 System.out.println("====================>");
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97 for (Changeset cset : changelog) {
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98 System.out.println(">");
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99 cset.dump();
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100 System.out.println("<");
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101 }
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102 }
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103
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104
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105 // mpatch.c : apply()
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106 private static byte[] apply(byte[] baseRevisionContent, List<PatchRecord> patch) {
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107 byte[] tempBuf = new byte[512]; // XXX
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108 int last = 0, destIndex = 0;
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109 for (PatchRecord pr : patch) {
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110 System.arraycopy(baseRevisionContent, last, tempBuf, destIndex, pr.start-last);
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111 destIndex += pr.start - last;
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112 System.arraycopy(pr.data, 0, tempBuf, destIndex, pr.data.length);
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113 destIndex += pr.data.length;
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114 last = pr.end;
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115 }
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116 System.arraycopy(baseRevisionContent, last, tempBuf, destIndex, baseRevisionContent.length - last);
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117 destIndex += baseRevisionContent.length - last; // total length
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118 byte[] rv = new byte[destIndex];
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119 System.arraycopy(tempBuf, 0, rv, 0, destIndex);
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120 return rv;
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121 }
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122
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123 static class PatchRecord { // copy of struct frag from mpatch.c
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124 int start, end, len;
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125 byte[] data;
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126
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127 public PatchRecord(int p1, int p2, int len, byte[] src, int srcOffset) {
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128 start = p1;
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129 end = p2;
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130 this.len = len;
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131 data = new byte[len];
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132 System.arraycopy(src, srcOffset, data, 0, len);
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133 }
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134 }
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135 }