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A library to read PST files with java, without need for external libraries.
There is a newer version: 0.9.3
/**
 * Copyright 2010 Richard Johnson & Orin Eman
 *
 * Licensed 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.
 *
 * ---
 *
 * This file is part of java-libpst.
 *
 * java-libpst is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * java-libpst 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 java-libpst.  If not, see .
 *
 */
package com.pff;

import java.io.IOException;

/**
 * DescriptorIndexNode is a leaf item from the Descriptor index b-tree
 * It is like a pointer to an element in the PST file, everything has one...
 * @author Richard Johnson
 */
public class DescriptorIndexNode {
	public int descriptorIdentifier;
	public long dataOffsetIndexIdentifier;
	public long localDescriptorsOffsetIndexIdentifier;
	public int parentDescriptorIndexIdentifier;
	public int itemType;

	//PSTFile.PSTFileBlock dataBlock = null;
	
	/**
	 * parse the data out into something meaningful
	 * @param data
	 */
	DescriptorIndexNode(byte[] data, int pstFileType) {
		// parse it out
		// first 4 bytes
		if (pstFileType == PSTFile.PST_TYPE_ANSI) {
			descriptorIdentifier = (int)PSTObject.convertLittleEndianBytesToLong(data, 0, 4);
			dataOffsetIndexIdentifier = (int)PSTObject.convertLittleEndianBytesToLong(data, 4, 8);
			localDescriptorsOffsetIndexIdentifier = (int)PSTObject.convertLittleEndianBytesToLong(data, 8, 12);
			parentDescriptorIndexIdentifier = (int)PSTObject.convertLittleEndianBytesToLong(data, 12, 16);
			//itemType = (int)PSTObject.convertLittleEndianBytesToLong(data, 28, 32);
		} else {
			descriptorIdentifier = (int)PSTObject.convertLittleEndianBytesToLong(data, 0, 4);
			dataOffsetIndexIdentifier = (int)PSTObject.convertLittleEndianBytesToLong(data, 8, 16);
			localDescriptorsOffsetIndexIdentifier = (int)PSTObject.convertLittleEndianBytesToLong(data, 16, 24);
			parentDescriptorIndexIdentifier = (int)PSTObject.convertLittleEndianBytesToLong(data, 24, 28);
			itemType = (int)PSTObject.convertLittleEndianBytesToLong(data, 28, 32);
		}
	}

	/*
	void readData(PSTFile file)
		throws IOException, PSTException
	{
		if ( dataBlock == null ) {
			dataBlock = file.readLeaf(dataOffsetIndexIdentifier);
		}
	}
	 *
	 */

	PSTNodeInputStream getNodeInputStream(PSTFile pstFile)
			throws IOException, PSTException
	{
		return new PSTNodeInputStream(pstFile,pstFile.getOffsetIndexNode(dataOffsetIndexIdentifier));
	}
	
	public String toString() {
		
		return "DescriptorIndexNode\n" +
			"Descriptor Identifier: "+descriptorIdentifier+" (0x"+Long.toHexString(descriptorIdentifier)+")\n"+
			"Data offset identifier: "+dataOffsetIndexIdentifier+" (0x"+Long.toHexString(dataOffsetIndexIdentifier)+")\n"+
			"Local descriptors offset index identifier: "+localDescriptorsOffsetIndexIdentifier+" (0x"+Long.toHexString(localDescriptorsOffsetIndexIdentifier)+")\n"+
			"Parent Descriptor Index Identifier: "+parentDescriptorIndexIdentifier+" (0x"+Long.toHexString(parentDescriptorIndexIdentifier)+")\n"+
			"Item Type: "+itemType+" (0x"+Long.toHexString(itemType)+")";
	}
}