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/*
* 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.palm;
import java.io.RandomAccessFile;
import java.io.IOException;
import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
/**
* <p>Provides functionality to decode a PDB formatted file into
* a <code>PalmDB</code> object given an <code>InputStream</code>.
* This class is only used by the <code>PalmDB</code> object.</p>
*
* <p>Sample usage:</p>
*
* <blockquote><pre><code>
* PdbDecoder decoder = new PdbDecoder("sample.pdb");
* PalmDB palmDB = decoder.parse();
* </code></pre></blockquote>
*
* <p>This decoder has the following assumptions on the PDB file:</p>
*
* <p><ol>
* <li>There is only one RecordList section in the PDB.</li>
* <li>The <code>Record</code> indices in the RecordList are sorted in
* order, i.e. the first <code>Record</code> index refers to
* <code>Record</code> 0, and so forth.</li>
* <li>The raw <code>Record</code> in the <code>Record</code> section
* are sorted as well in order, i.e. first <code>Record</code>
* comes ahead of second <code>Record</code>, etc.</li>
* </ol></p>
*
* <p>Other decoders assume these as well.</p>
*
* @see PalmDB
* @see Record
*/
public final class PdbDecoder {
/**
* <p>This method decodes a PDB file into a <code>PalmDB</code>
* object.</p>
*
* <p>First, the header data is read using the <code>PdbHeader</code>
* <code>read</code> method. Next, the RecordList section is
* read and the <code>Record</code> offsets are stored for use when
* parsing the Records. Based on these offsets, the bytes
* corresponding to each <code>Record</code> are read and each is
* stored in a <code>Record</code> object. Lastly, the data is
* used to create a <code>PalmDB</code> object.</p>
*
* @param fileName PDB file name.
*
* @throws IOException If I/O error occurs.
*/
public PalmDB parse(String fileName) throws IOException {
RandomAccessFile file = new RandomAccessFile(fileName, "r");
// read the PDB header
PdbHeader header = new PdbHeader();
header.read(file);
Record recArray[] = new Record[header.numRecords];
if (header.numRecords != 0) {
// read in the record indices + offsets
int recOffset[] = new int[header.numRecords];
byte recAttrs[] = new byte[header.numRecords];
for (int i = 0; i < header.numRecords; i++) {
recOffset[i] = file.readInt();
// read in attributes (1 byte) + unique id (3 bytes)
// take away the unique id, store the attributes
int attr = file.readInt();
recAttrs[i] = (byte) (attr >>> 24);
}
// read the records
int lastIndex = header.numRecords - 1;
for (int i = 0; i < lastIndex; i++) {
file.seek(recOffset[i]);
int len = recOffset[i+1] - recOffset[i];
byte[] bytes = new byte[len];
file.readFully(bytes);
recArray[i] = new Record(bytes, recAttrs[i]);
}
// last record
file.seek(recOffset[lastIndex]);
int len = (int) file.length() - recOffset[lastIndex];
byte[] bytes = new byte[len];
file.readFully(bytes);
recArray[lastIndex] = new Record(bytes, recAttrs[lastIndex]);
}
file.close();
// create PalmDB and return it
PalmDB pdb = new PalmDB(header.pdbName, header.creatorID,
header.typeID, header.version, header.attribute, recArray);
return pdb;
}
/**
* <p>This method decodes a PDB file into a <code>PalmDB</code>
* object.</p>
*
* <p>First, the header data is read using the <code>PdbHeader</code>
* <code>read</code> method. Next, the RecordList section is
* read and the <code>Record</code> offsets are stored for use when
* parsing the Records. Based on these offsets, the bytes
* corresponding to each <code>Record</code> are read and each is
* stored in a <code>Record</code> object. Lastly, the data is
* used to create a <code>PalmDB</code> object.</p>
*
* @param b <code>byte[]</code> containing PDB.
*
* @throws IOException If I/O error occurs.
*/
public PalmDB parse(byte[] b) throws IOException {
ByteArrayInputStream bais = new ByteArrayInputStream(b);
DataInputStream dis = new DataInputStream(bais);
// read the PDB header
PdbHeader header = new PdbHeader();
header.read(dis);
Record recArray[] = new Record[header.numRecords];
if (header.numRecords != 0) {
// read in the record indices + offsets
int recOffset[] = new int[header.numRecords];
byte recAttrs[] = new byte[header.numRecords];
for (int i = 0; i < header.numRecords; i++) {
recOffset[i] = dis.readInt();
// read in attributes (1 byte) + unique id (3 bytes)
// take away the unique id, store the attributes
int attr = dis.readInt();
recAttrs[i] = (byte) (attr >>> 24);
}
// read the records
int lastIndex = header.numRecords - 1;
for (int i = 0; i < lastIndex; i++) {
//dis.seek(recOffset[i]);
dis.reset();
dis.skip(recOffset[i]);
int len = recOffset[i+1] - recOffset[i];
byte[] bytes = new byte[len];
dis.readFully(bytes);
recArray[i] = new Record(bytes, recAttrs[i]);
}
// last record
dis.reset();
int len = dis.available() - recOffset[lastIndex];
dis.skip(recOffset[lastIndex]);
byte[] bytes = new byte[len];
dis.readFully(bytes);
recArray[lastIndex] = new Record(bytes, recAttrs[lastIndex]);
}
// create PalmDB and return it
PalmDB pdb = new PalmDB(header.pdbName, header.creatorID,
header.typeID, header.version, header.attribute, recArray);
return pdb;
}
}
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