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comparison 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
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children 08db726a0fb7
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1 package com.tmate.hgkit.console;
2
3 import java.io.BufferedInputStream;
4 import java.io.DataInput;
5 import java.io.DataInputStream;
6 import java.io.File;
7 import java.io.FileInputStream;
8 import java.math.BigInteger;
9 import java.util.ArrayList;
10 import java.util.Collections;
11 import java.util.Iterator;
12 import java.util.LinkedList;
13 import java.util.List;
14 import java.util.zip.Deflater;
15 import java.util.zip.Inflater;
16
17 import com.tmate.hgkit.ll.Changeset;
18
19 /**
20 *
21 * @author artem
22 */
23 public class Main {
24
25 public static void main(String[] args) throws Exception {
26 Deflater zip1 = new Deflater(6, true);
27 final byte[] input = "Abstractions are valueless".getBytes();
28 zip1.setInput(input);
29 zip1.finish();
30 byte[] result1 = new byte[100];
31 int resLen1 = zip1.deflate(result1);
32 System.out.printf("%3d:", resLen1);
33 for (int i = 0; i < resLen1; i++) {
34 System.out.printf("%02X", result1[i]);
35 }
36 System.out.println();
37 //
38 Deflater zip2 = new Deflater(6, false);
39 zip2.setInput(input);
40 zip2.finish();
41 byte[] result2 = new byte[100];
42 int resLen2 = zip2.deflate(result2);
43 System.out.printf("%3d:", resLen2);
44 for (int i = 0; i < resLen2; i++) {
45 System.out.printf("%02X", result2[i]);
46 }
47 System.out.println();
48 //
49 LinkedList<Changeset> changelog = new LinkedList<Changeset>();
50 //
51 DataInputStream dis = new DataInputStream(new BufferedInputStream(new FileInputStream(new File("/temp/hg/hello/" + ".hg/store/00changelog.i"))));
52 DataInput di = dis;
53 dis.mark(10);
54 int versionField = di.readInt();
55 dis.reset();
56 final int INLINEDATA = 1 << 16;
57
58 boolean inlineData = (versionField & INLINEDATA) != 0;
59 System.out.printf("%#8x, inline: %b\n", versionField, inlineData);
60 System.out.println("\tOffset\tFlags\tPacked\t Actual\tBase Rev Link Rev\tParent1\tParent2\tnodeid");
61 int entryCount = 0;
62 while (dis.available() > 0) {
63 long l = di.readLong();
64 long offset = l >>> 16;
65 int flags = (int) (l & 0X0FFFF);
66 int compressedLen = di.readInt();
67 int actualLen = di.readInt();
68 int baseRevision = di.readInt();
69 int linkRevision = di.readInt();
70 int parent1Revision = di.readInt();
71 int parent2Revision = di.readInt();
72 byte[] buf = new byte[32];
73 di.readFully(buf, 12, 20);
74 dis.skip(12);
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));
76 if (inlineData) {
77 byte[] data = new byte[compressedLen];
78 di.readFully(data);
79 if (data[0] == 0x78 /* 'x' */) {
80 Inflater zlib = new Inflater();
81 zlib.setInput(data, 0, compressedLen);
82 byte[] result = new byte[actualLen*2];
83 int resultLen = zlib.inflate(result);
84 zlib.end();
85 if (resultLen != actualLen) {
86 System.err.printf("Expected:%d, decomressed to:%d bytes\n", actualLen, resultLen);
87 }
88 String resultString;
89 if (baseRevision != entryCount) {
90 // this is a patch
91 byte[] baseRevContent = changelog.get(baseRevision).rawData;
92 LinkedList<PatchRecord> bins = new LinkedList<PatchRecord>();
93 int p1, p2, len, patchElementIndex = 0;
94 do {
95 final int x = patchElementIndex;
96 p1 = (result[x] << 24) | (result[x+1] << 16) | (result[x+2] << 8) | result[x+3];
97 p2 = (result[x+4] << 24) | (result[x+5] << 16) | (result[x+6] << 8) | result[x+7];
98 len = (result[x+8] << 24) | (result[x+9] << 16) | (result[x+10] << 8) | result[x+11];
99 System.out.printf("%4d %4d %4d\n", p1, p2, len);
100 patchElementIndex += 12 + len;
101 bins.add(new PatchRecord(p1, p2, len, result, x+12));
102 } while (patchElementIndex < resultLen);
103 //
104 result = apply(baseRevContent, bins);
105 resultLen = result.length;
106 }
107 resultString = new String(result, 0, resultLen, "UTF-8");
108 System.out.println(resultString);
109 entryCount++;
110 Changeset changeset = new Changeset();
111 changeset.read(result, 0, resultLen);
112 changelog.add(changeset);
113 } // TODO else if uncompressed
114 }
115 }
116 dis.close();
117 //
118 System.out.println("\n\n");
119 System.out.println("====================>");
120 for (Changeset cset : changelog) {
121 System.out.println(">");
122 cset.dump();
123 System.out.println("<");
124 }
125 }
126
127
128 // mpatch.c : apply()
129 private static byte[] apply(byte[] baseRevisionContent, List<PatchRecord> patch) {
130 byte[] tempBuf = new byte[512]; // XXX
131 int last = 0, destIndex = 0;
132 for (PatchRecord pr : patch) {
133 System.arraycopy(baseRevisionContent, last, tempBuf, destIndex, pr.start-last);
134 destIndex += pr.start - last;
135 System.arraycopy(pr.data, 0, tempBuf, destIndex, pr.data.length);
136 destIndex += pr.data.length;
137 last = pr.end;
138 }
139 System.arraycopy(baseRevisionContent, last, tempBuf, destIndex, baseRevisionContent.length - last);
140 destIndex += baseRevisionContent.length - last; // total length
141 byte[] rv = new byte[destIndex];
142 System.arraycopy(tempBuf, 0, rv, 0, destIndex);
143 return rv;
144 }
145
146 static class PatchRecord { // copy of struct frag from mpatch.c
147 int start, end, len;
148 byte[] data;
149
150 public PatchRecord(int p1, int p2, int len, byte[] src, int srcOffset) {
151 start = p1;
152 end = p2;
153 this.len = len;
154 data = new byte[len];
155 System.arraycopy(src, srcOffset, data, 0, len);
156 }
157 }
158 }