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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;
import java.util.*;

/**
 * The descriptor items contain information that describes a PST object.
 * This is like extended table entries, usually when the data cannot fit in a traditional table item.
 * @author Richard Johnson
 */
class PSTDescriptorItem
{
	PSTDescriptorItem(byte[] data, int offset, PSTFile pstFile)
	{
		this.pstFile = pstFile;

		if (pstFile.getPSTFileType() == PSTFile.PST_TYPE_ANSI) {
			descriptorIdentifier = (int)PSTObject.convertLittleEndianBytesToLong(data, offset, offset+4);
			offsetIndexIdentifier = ((int)PSTObject.convertLittleEndianBytesToLong(data, offset+4, offset+8))
										& 0xfffffffe;
			subNodeOffsetIndexIdentifier = (int)PSTObject.convertLittleEndianBytesToLong(data, offset+8, offset+12)
										& 0xfffffffe;
		} else {
			descriptorIdentifier = (int)PSTObject.convertLittleEndianBytesToLong(data, offset, offset+4);
			offsetIndexIdentifier = ((int)PSTObject.convertLittleEndianBytesToLong(data, offset+8, offset+16))
										& 0xfffffffe;
			subNodeOffsetIndexIdentifier = (int)PSTObject.convertLittleEndianBytesToLong(data, offset+16, offset+24)
										& 0xfffffffe;
		}
	}

	public byte[] getData()
		throws IOException, PSTException
	{
		if ( dataBlockData != null ) {
			return dataBlockData;
		}

		PSTNodeInputStream in = pstFile.readLeaf(offsetIndexIdentifier);
		byte[] out = new byte[(int)in.length()];
		in.read(out);
		dataBlockData = out;
		return dataBlockData;
	}
	
	public int[] getBlockOffsets()
		throws IOException, PSTException
	{
		if ( dataBlockOffsets != null ) {

			return dataBlockOffsets;
		}
		Long[] offsets = pstFile.readLeaf(offsetIndexIdentifier).getBlockOffsets();
		int[] offsetsOut = new int[offsets.length];
		for (int x = 0; x < offsets.length; x++) {
			offsetsOut[x] = offsets[x].intValue();
		}
		return offsetsOut;
	}
	
	public int getDataSize()
		throws IOException, PSTException
	{
		return pstFile.getLeafSize(offsetIndexIdentifier);
	}
	
	// Public data
	int descriptorIdentifier;
	int offsetIndexIdentifier;
	int subNodeOffsetIndexIdentifier;

	// These are private to ensure that getData()/getBlockOffets() are used 
	//private PSTFile.PSTFileBlock dataBlock = null;
	byte[] dataBlockData = null;
	int[] dataBlockOffsets = null;
	private PSTFile pstFile;

	@Override
	public String toString() {
		return 
			"PSTDescriptorItem\n"+
			"   descriptorIdentifier: "+descriptorIdentifier+"\n"+
			"   offsetIndexIdentifier: "+offsetIndexIdentifier+"\n"+
			"   subNodeOffsetIndexIdentifier: "+subNodeOffsetIndexIdentifier+"\n";
			
		
	}

}