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/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2000, 2010 Oracle and/or its affiliates.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org 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 version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
/**
* <p>Class used only internally by <code>PDBEncoder</code> and
* <code>PDBDecoder</code> to store, read and write a pdb header.</p>
*
* <p>Note that fields are intended to be accessible only at the
* package level.</p>
*
* <p>Some of the fields are internally represented using a
* larger type since Java does not have unsigned types.
* Some are not since they are not relevant for now.
* The <code>read</code> and <code>write</code> methods should
* handle them properly.</p>
*
* @author Herbie Ong
*/
final class PDBHeader {
/** name of the database. 32 bytes. */
byte[] pdbName = null;
/** flags for the database. Palm UInt16. Unsignedness should be irrelevant. */
short attribute = 0;
/** application-specific version for the database. Palm UInt16 */
int version = 0;
/** date created. Palm UInt32 */
long creationDate = 0;
/** date last modified. Palm UInt32 */
long modificationDate = 0;
/** date last backup. Palm UInt32 */
long lastBackupDate = 0;
/**
* incremented every time a record is
* added, deleted or modified. Palm UInt32.
*/
long modificationNumber = 0;
/** optional field. Palm UInt32. Unsignedness should be irrelevant. */
int appInfoID = 0;
/** optional field. Palm UInt32. Unsignedness should be irrelevant. */
int sortInfoID = 0;
/** database type id. Palm UInt32. Unsignedness should be irrelevant. */
int typeID = 0;
/** database creator id. Palm UInt32. Unsignedness should be irrelevant. */
int creatorID = 0;
/** ??? */
int uniqueIDSeed = 0;
/** see numRecords. 4 bytes. */
int nextRecordListID = 0;
/**
* number of records stored in the database header.
* If all the record entries cannot fit in the header,
* then nextRecordList has the local ID of a
* recordList that contains the next set of records.
* Palm UInt16.
*/
int numRecords = 0;
/**
* Read in the data for the pdb header. Need to
* preserve the unsigned value for some of the fields.
*
* @param di a DataInput object
* @throws IOException if I/O error occurs
*/
public void read(DataInput in) throws IOException {
pdbName = new byte[PalmDB.NAME_LENGTH];
in.readFully(pdbName);
attribute = in.readShort();
version = in.readUnsignedShort();
creationDate = ((long) in.readInt()) & 0xffffffffL;
modificationDate = ((long) in.readInt()) & 0xffffffffL;
lastBackupDate = ((long) in.readInt()) & 0xffffffffL;
modificationNumber = ((long) in.readInt()) & 0xffffffffL;
appInfoID = in.readInt();
sortInfoID = in.readInt();
creatorID = in.readInt();
typeID = in.readInt();
uniqueIDSeed = in.readInt();
nextRecordListID = in.readInt();
numRecords = in.readUnsignedShort();
}
/**
* Write out pdb header data.
*
* @param out a DataOut object
* @throws IOException if I/O error occurs
*/
public void write(DataOutput out) throws IOException {
out.write(pdbName);
out.writeShort(attribute);
out.writeShort(version);
out.writeInt((int) creationDate);
out.writeInt((int) modificationDate);
out.writeInt((int) lastBackupDate);
out.writeInt((int) modificationNumber);
out.writeInt(appInfoID);
out.writeInt(sortInfoID);
out.writeInt(typeID);
out.writeInt(creatorID);
out.writeInt(uniqueIDSeed);
out.writeInt(nextRecordListID);
out.writeShort(numRecords);
}
}
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