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/*************************************************************************
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: DocumentDescriptor.java,v $
*
* $Revision: 1.3 $
*
* last change: $Author: ihi $ $Date: 2006-08-01 13:10:09 $
*
* The Contents of this file are made available subject to
* the terms of GNU Lesser General Public License Version 2.1.
*
*
* GNU Lesser General Public License Version 2.1
* =============================================
* Copyright 2005 by Sun Microsystems, Inc.
* 901 San Antonio Road, Palo Alto, CA 94303, USA
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software Foundation.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
************************************************************************/
package org.openoffice.xmerge.converter.xml.sxw.pocketword;
import org.openoffice.xmerge.util.EndianConverter;
import java.io.ByteArrayOutputStream;
import java.io.OutputStream;
import java.io.IOException;
import java.util.Vector;
/**
* 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 Vector paragraphDesc = null;
DocumentDescriptor() {
paragraphDesc = new Vector(0, 1);
}
/**
* 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((short)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 = (ParagraphDescriptor)paragraphDesc.elementAt(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();
}
}
}
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