1 | /* This file is part of Aard Dictionary for Android <http://aarddict.org>. |
2 | * |
3 | * This program is free software: you can redistribute it and/or modify |
4 | * it under the terms of the GNU General Public License version 3 |
5 | * as published by the Free Software Foundation. |
6 | * |
7 | * This program is distributed in the hope that it will be useful, |
8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
10 | * GNU General Public License <http://www.gnu.org/licenses/gpl-3.0.txt> |
11 | * for more details. |
12 | * |
13 | * Copyright (C) 2010 Igor Tkach |
14 | */ |
15 | |
16 | package aarddict; |
17 | |
18 | import java.io.IOException; |
19 | import java.util.HashMap; |
20 | import java.util.Map; |
21 | import java.util.UUID; |
22 | |
23 | public final class Header { |
24 | |
25 | public final String signature; |
26 | public final String sha1sum; |
27 | public final UUID uuid; |
28 | public final int version; |
29 | public final int volume; |
30 | public final int of; |
31 | public final long metaLength; |
32 | public final long indexCount; |
33 | public final long articleOffset; |
34 | public final String index1ItemFormat; |
35 | public final String keyLengthFormat; |
36 | public final String articleLengthFormat; |
37 | public final long index1Offset; |
38 | public final long index2Offset; |
39 | public final int index1ItemSize; |
40 | public final char keyPointerSpec; |
41 | public final char articlePointerSpec; |
42 | public final char keyLengthSpec; |
43 | public final char articleLengthSpec; |
44 | |
45 | Header(RandomAccessFile file) throws IOException { |
46 | int specLen = 0; |
47 | this.signature = file.readUTF8(4); |
48 | specLen += 4; |
49 | |
50 | this.sha1sum = file.readUTF8(40); |
51 | specLen += 40; |
52 | |
53 | this.version = file.readUnsignedShort(); |
54 | specLen += 2; |
55 | |
56 | this.uuid = file.readUUID(); |
57 | specLen += 16; |
58 | |
59 | this.volume = file.readUnsignedShort(); |
60 | specLen += 2; |
61 | |
62 | this.of = file.readUnsignedShort(); |
63 | specLen += 2; |
64 | |
65 | this.metaLength = file.readUnsignedInt(); |
66 | specLen += 4; |
67 | |
68 | this.indexCount = file.readUnsignedInt(); |
69 | specLen += 4; |
70 | |
71 | this.articleOffset = file.readUnsignedInt(); |
72 | specLen += 4; |
73 | |
74 | this.index1ItemFormat = file.readUTF8(4); |
75 | specLen += 4; |
76 | |
77 | this.keyLengthFormat = file.readUTF8(2); |
78 | specLen += 2; |
79 | this.keyLengthSpec = this.keyLengthFormat.charAt(1); |
80 | |
81 | this.articleLengthFormat = file.readUTF8(2); |
82 | specLen += 2; |
83 | this.articleLengthSpec = this.articleLengthFormat.charAt(1); |
84 | |
85 | this.index1ItemSize = calcSize(this.index1ItemFormat); |
86 | |
87 | this.index1Offset = specLen + this.metaLength; |
88 | this.index2Offset = this.index1Offset + this.indexCount*this.index1ItemSize; |
89 | this.keyPointerSpec = this.index1ItemFormat.charAt(1); |
90 | this.articlePointerSpec = this.index1ItemFormat.charAt(2); |
91 | } |
92 | |
93 | static Map<Character, Integer> structSizes = new HashMap<Character, Integer>() { |
94 | { |
95 | put('h', 2); |
96 | put('H', 2); |
97 | put('i', 4); |
98 | put('I', 4); |
99 | put('l', 4); |
100 | put('L', 4); |
101 | put('q', 8); |
102 | put('Q', 8); |
103 | } |
104 | }; |
105 | |
106 | static int calcSize(String structSpec) { |
107 | int size = 0; |
108 | int length = structSpec.length(); |
109 | //ignore byte order spec at index 0 |
110 | for (int i = 1; i < length; i++) { |
111 | char c = structSpec.charAt(i); |
112 | Integer unitSize = structSizes.get(c); |
113 | if (unitSize != null) { |
114 | size += unitSize; |
115 | } |
116 | } |
117 | return size; |
118 | } |
119 | } |