1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
|
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
package org.openoffice.xmerge.converter.xml.sxw.pocketword;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import org.openoffice.xmerge.util.EndianConverter;
/**
* This class to represent the data structure stored by a Pocket Word file that
* describes that file.
*
* The data structure is of variable length, beginning at the end of the
* font declarations and ending 10 bytes before the first instance of 0xFF 0xFF
* marking a paragraph block.
*
* The variable length component arises from an 8 byte structure describing each
* paragraph in the document. These paragraph descriptors appear at the end
* of the Document Descriptor.
*
* @author Mark Murnane
* @version 1.1
*/
class DocumentDescriptor {
private short numParagraphs = 0;
private short length = 0;
private short numLines = 0;
private ArrayList<ParagraphDescriptor> paragraphDesc = null;
DocumentDescriptor() {
paragraphDesc = new ArrayList<ParagraphDescriptor>(0);
}
/**
* Updates the <code>DocumentDescriptor</code> to include details of another
* paragraph in the document.
*
* @param len The number of characters in the paragraph.
* @param lines The number of lines on screen that the paragraph uses.
*/
public void addParagraph(short len, short lines) {
ParagraphDescriptor pd = new ParagraphDescriptor(len, lines);
paragraphDesc.add(pd);
numParagraphs++;
numLines += lines;
length += pd.length;
}
/**
* Retrieve the <code>DocumentDescriptor's</code> data. Due to the variable
* length nature of the descriptor, certain fields can only be
* calculated/written after the addition of all paragraphs.
*
* @return Byte array containing the Pocket Word representation of this
* <code>DocumentDescriptor</code>.
*/
public byte[] getDescriptor () {
ByteArrayOutputStream descStream = new ByteArrayOutputStream();
writeHeader(descStream);
/*
* This value seems to increment by 0x02 for each paragraph.
* For a single paragraph doc, the value is 0x08, 0x0A for two,
* 0x0C for three ...
*/
try {
descStream.write(EndianConverter.writeShort((short)(6 +
(numParagraphs * 2))));
descStream.write(EndianConverter.writeShort(numParagraphs));
descStream.write(EndianConverter.writeShort((short)0));
descStream.write(EndianConverter.writeShort(numParagraphs));
descStream.write(EndianConverter.writeShort((short)0));
descStream.write(EndianConverter.writeShort(length));
descStream.write(EndianConverter.writeShort((short)0));
descStream.write(EndianConverter.writeShort(numLines));
descStream.write(new byte[] { 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00 } );
for (int i = 0; i < paragraphDesc.size(); i++) {
ParagraphDescriptor pd = paragraphDesc.get(i);
descStream.write(pd.getDescriptor());
}
// Byte sequence marking the end of this DocumentDescriptor
descStream.write(EndianConverter.writeShort((short)0));
descStream.write(EndianConverter.writeShort((short)0x41));
}
catch (IOException ioe) {
// Should never happen as this is a memory based stream.
}
return descStream.toByteArray();
}
/*
* This method loads the intial fixed portion of the descriptor and the
* mid-section. The mid-section is variable but Pocket Word doesn't seem
* to mind default values.
*/
private void writeHeader(OutputStream descStream) {
try {
descStream.write(new byte[] { 0x00, 0x00, 0x00, 0x00,
0x07, 0x00, 0x06, 0x00,
0x15, 0x00, 0x10, 0x00,
0x01, 0x00, (byte)0xD0, 0x2F,
0x00, 0x00, (byte)0xE0, 0x3D,
0x00, 0x00, (byte)0xF0, 0x00,
0x00, 0x00, (byte)0xA0, 0x05,
0x00, 0x00, (byte)0xA0, 0x05,
0x00, 0x00, (byte)0xA0, 0x05,
0x00, 0x00, (byte)0xA0, 0x05,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x0A, 0x00, 0x00, 0x00,
0x00, 0x00, 0x04, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x0A, 0x00, 0x00, 0x00,
0x00, 0x00, 0x04, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x08, 0x00,
0x07, 0x00, 0x10, 0x00,
0x01, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x12, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x1F, 0x04, 0x00, 0x00 } );
/*
* The next four bytes are variable, but a pattern hasn't yet been
* established. Pocket Word seems to accept this constant value.
*
* The bytes are repeated after another 12 byte sequence which does
* not seem to change from one file to the next.
*/
descStream.write(new byte[] { (byte)0xE2, 0x02, 0x00, 0x00 } );
descStream.write(new byte[] { 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x3D, 0x04, 0x00, 0x00 } );
descStream.write(new byte[] { (byte)0xE2, 0x02, 0x00, 0x00 } );
descStream.write(new byte[] { 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x40, 0x00, 0x08, 0x00 } );
}
catch (IOException ioe) {
/* Shouldn't happen with a ByteArrayOutputStream */
}
}
/**
* <code>ParagraphDescriptor</code> represents the data structure used to
* describe individual paragraphs within a <code>DocumentDescriptor.</code>
*
* It is used solely by the <code>DocumentDescriptor<code> class.
*/
private class ParagraphDescriptor {
private short filler = 0;
private short lines = 0;
private short length = 0;
private short unknown = 0x23;
public ParagraphDescriptor(short len, short numLines) {
lines = numLines;
length = (short)(len + 1);
}
public byte[] getDescriptor() {
ByteArrayOutputStream desc = new ByteArrayOutputStream();
try {
desc.write(EndianConverter.writeShort(filler));
desc.write(EndianConverter.writeShort(lines));
desc.write(EndianConverter.writeShort(length));
desc.write(EndianConverter.writeShort(unknown));
}
catch (IOException ioe) {
/* Should never happen */
}
return desc.toByteArray();
}
}
}
|
