| /************************************************************** |
| * |
| * 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 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| *************************************************************/ |
| |
| |
| |
| 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> |
| * |
| * @author Herbie Ong |
| * @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 len = 0; |
| byte[] bytes = null; |
| |
| int lastIndex = header.numRecords - 1; |
| |
| for (int i = 0; i < lastIndex; i++) { |
| |
| file.seek(recOffset[i]); |
| len = recOffset[i+1] - recOffset[i]; |
| bytes = new byte[len]; |
| file.readFully(bytes); |
| recArray[i] = new Record(bytes, recAttrs[i]); |
| } |
| |
| // last record |
| file.seek(recOffset[lastIndex]); |
| len = (int) file.length() - recOffset[lastIndex]; |
| 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 len = 0; |
| byte[] bytes = null; |
| |
| int lastIndex = header.numRecords - 1; |
| |
| for (int i = 0; i < lastIndex; i++) { |
| |
| //dis.seek(recOffset[i]); |
| dis.reset(); |
| dis.skip(recOffset[i]); |
| len = recOffset[i+1] - recOffset[i]; |
| bytes = new byte[len]; |
| dis.readFully(bytes); |
| recArray[i] = new Record(bytes, recAttrs[i]); |
| } |
| |
| // last record |
| |
| dis.reset(); |
| len = (int) dis.available() - recOffset[lastIndex]; |
| dis.skip(recOffset[lastIndex]); |
| 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; |
| } |
| |
| |
| |
| } |
| |