/* * 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.IOException; import java.io.ByteArrayInputStream; import java.io.DataInputStream; /** * Provides functionality to decode a PDB formatted file into a {@code PalmDB} * object given an {@code InputStream}. * *
This class is only used by the {@code PalmDB} object.
* *Sample usage:
** *{@code PdbDecoder decoder = new PdbDecoder("sample.pdb"); * PalmDB palmDB = decoder.parse();}
This decoder has the following assumptions on the PDB file:
*Other decoders assume these as well.
* * @see PalmDB * @see Record */ public final class PdbDecoder { /** * This method decodes a PDB file into a {@code PalmDB} object. * *First, the header data is read using the {@code PdbHeader.read} * method. Next, the RecordList section is read and the {@code Record} * offsets are stored for use when parsing the Records. Based on these * offsets, the bytes corresponding to each {@code Record} are read and * each is stored in a {@code Record} object. Lastly, the data is used * to create a {@code PalmDB} object.
* * @param b {@code byte[]} 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; } }