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annotate src/com/tmate/hgkit/console/Main.java @ 0:dbd663faec1f

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Basic changelog parsing
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 17 Dec 2010 19:05:59 +0100
parents
children 08db726a0fb7
rev   line source
0
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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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 Deflater zip1 = new Deflater(6, true);
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27 final byte[] input = "Abstractions are valueless".getBytes();
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28 zip1.setInput(input);
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29 zip1.finish();
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30 byte[] result1 = new byte[100];
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31 int resLen1 = zip1.deflate(result1);
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32 System.out.printf("%3d:", resLen1);
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33 for (int i = 0; i < resLen1; i++) {
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34 System.out.printf("%02X", result1[i]);
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35 }
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36 System.out.println();
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37 //
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38 Deflater zip2 = new Deflater(6, false);
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39 zip2.setInput(input);
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40 zip2.finish();
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41 byte[] result2 = new byte[100];
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42 int resLen2 = zip2.deflate(result2);
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43 System.out.printf("%3d:", resLen2);
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44 for (int i = 0; i < resLen2; i++) {
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45 System.out.printf("%02X", result2[i]);
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46 }
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47 System.out.println();
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48 //
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49 LinkedList<Changeset> changelog = new LinkedList<Changeset>();
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50 //
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51 DataInputStream dis = new DataInputStream(new BufferedInputStream(new FileInputStream(new File("/temp/hg/hello/" + ".hg/store/00changelog.i"))));
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52 DataInput di = dis;
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53 dis.mark(10);
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54 int versionField = di.readInt();
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55 dis.reset();
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56 final int INLINEDATA = 1 << 16;
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57
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58 boolean inlineData = (versionField & INLINEDATA) != 0;
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59 System.out.printf("%#8x, inline: %b\n", versionField, inlineData);
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60 System.out.println("\tOffset\tFlags\tPacked\t Actual\tBase Rev Link Rev\tParent1\tParent2\tnodeid");
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61 int entryCount = 0;
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62 while (dis.available() > 0) {
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63 long l = di.readLong();
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64 long offset = l >>> 16;
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65 int flags = (int) (l & 0X0FFFF);
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66 int compressedLen = di.readInt();
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67 int actualLen = di.readInt();
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68 int baseRevision = di.readInt();
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69 int linkRevision = di.readInt();
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70 int parent1Revision = di.readInt();
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71 int parent2Revision = di.readInt();
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72 byte[] buf = new byte[32];
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73 di.readFully(buf, 12, 20);
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74 dis.skip(12);
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75 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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76 if (inlineData) {
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77 byte[] data = new byte[compressedLen];
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78 di.readFully(data);
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79 if (data[0] == 0x78 /* 'x' */) {
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80 Inflater zlib = new Inflater();
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81 zlib.setInput(data, 0, compressedLen);
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82 byte[] result = new byte[actualLen*2];
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83 int resultLen = zlib.inflate(result);
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84 zlib.end();
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85 if (resultLen != actualLen) {
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86 System.err.printf("Expected:%d, decomressed to:%d bytes\n", actualLen, resultLen);
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87 }
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88 String resultString;
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89 if (baseRevision != entryCount) {
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90 // this is a patch
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91 byte[] baseRevContent = changelog.get(baseRevision).rawData;
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92 LinkedList<PatchRecord> bins = new LinkedList<PatchRecord>();
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93 int p1, p2, len, patchElementIndex = 0;
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94 do {
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95 final int x = patchElementIndex;
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96 p1 = (result[x] << 24) | (result[x+1] << 16) | (result[x+2] << 8) | result[x+3];
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97 p2 = (result[x+4] << 24) | (result[x+5] << 16) | (result[x+6] << 8) | result[x+7];
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98 len = (result[x+8] << 24) | (result[x+9] << 16) | (result[x+10] << 8) | result[x+11];
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99 System.out.printf("%4d %4d %4d\n", p1, p2, len);
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100 patchElementIndex += 12 + len;
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101 bins.add(new PatchRecord(p1, p2, len, result, x+12));
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102 } while (patchElementIndex < resultLen);
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103 //
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104 result = apply(baseRevContent, bins);
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105 resultLen = result.length;
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106 }
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107 resultString = new String(result, 0, resultLen, "UTF-8");
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108 System.out.println(resultString);
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109 entryCount++;
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110 Changeset changeset = new Changeset();
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111 changeset.read(result, 0, resultLen);
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112 changelog.add(changeset);
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113 } // TODO else if uncompressed
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114 }
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115 }
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116 dis.close();
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117 //
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118 System.out.println("\n\n");
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119 System.out.println("====================>");
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120 for (Changeset cset : changelog) {
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121 System.out.println(">");
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122 cset.dump();
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123 System.out.println("<");
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124 }
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125 }
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126
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127
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128 // mpatch.c : apply()
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129 private static byte[] apply(byte[] baseRevisionContent, List<PatchRecord> patch) {
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130 byte[] tempBuf = new byte[512]; // XXX
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131 int last = 0, destIndex = 0;
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132 for (PatchRecord pr : patch) {
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133 System.arraycopy(baseRevisionContent, last, tempBuf, destIndex, pr.start-last);
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134 destIndex += pr.start - last;
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135 System.arraycopy(pr.data, 0, tempBuf, destIndex, pr.data.length);
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136 destIndex += pr.data.length;
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137 last = pr.end;
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138 }
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139 System.arraycopy(baseRevisionContent, last, tempBuf, destIndex, baseRevisionContent.length - last);
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140 destIndex += baseRevisionContent.length - last; // total length
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141 byte[] rv = new byte[destIndex];
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142 System.arraycopy(tempBuf, 0, rv, 0, destIndex);
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143 return rv;
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144 }
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145
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146 static class PatchRecord { // copy of struct frag from mpatch.c
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147 int start, end, len;
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148 byte[] data;
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149
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150 public PatchRecord(int p1, int p2, int len, byte[] src, int srcOffset) {
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151 start = p1;
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152 end = p2;
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153 this.len = len;
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154 data = new byte[len];
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155 System.arraycopy(src, srcOffset, data, 0, len);
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156 }
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157 }
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158 }