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The Apache Commons Codec package contains simple encoder and decoders for various formats such as Base64 and Hexadecimal. In addition to these widely used encoders and decoders, the codec package also maintains a collection of phonetic encoding utilities.
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/* ====================================================================
   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.apache.poi.hslf.dev;

import java.io.IOException;
import java.util.Map;

import org.apache.commons.io.output.UnsynchronizedByteArrayOutputStream;
import org.apache.poi.hslf.record.CurrentUserAtom;
import org.apache.poi.hslf.record.PersistPtrHolder;
import org.apache.poi.hslf.record.PositionDependentRecord;
import org.apache.poi.hslf.record.Record;
import org.apache.poi.hslf.record.UserEditAtom;
import org.apache.poi.hslf.usermodel.HSLFSlideShowImpl;
import org.apache.poi.util.LittleEndian;

/**
 * Uses record level code to locate UserEditAtom records, and other
 *  persistence related atoms. Tries to match them together, to help
 *  illuminate quite what all the offsets mean
 */
public final class UserEditAndPersistListing {
    private static byte[] fileContents;

    public static void main(String[] args) throws IOException {
        if(args.length < 1) {
            System.err.println("Need to give a filename");
            System.exit(1);
        }

        // Create the slideshow object, for normal working with
        try (HSLFSlideShowImpl ss = new HSLFSlideShowImpl(args[0])) {
            fileContents = ss.getUnderlyingBytes();
            System.out.println();

            // Find any persist ones first
            int pos = 0;
            for (org.apache.poi.hslf.record.Record r : ss.getRecords()) {
                if (r.getRecordType() == 6001L) {
                    // PersistPtrFullBlock
                    System.out.println("Found PersistPtrFullBlock at " + pos + " (" + Integer.toHexString(pos) + ")");
                }
                if (r.getRecordType() == 6002L) {
                    // PersistPtrIncrementalBlock
                    System.out.println("Found PersistPtrIncrementalBlock at " + pos + " (" + Integer.toHexString(pos) + ")");
                    PersistPtrHolder pph = (PersistPtrHolder) r;

                    // Check the sheet offsets
                    Map sheetOffsets = pph.getSlideLocationsLookup();
                    for (int id : pph.getKnownSlideIDs()) {
                        Integer offset = sheetOffsets.get(id);

                        System.out.println("  Knows about sheet " + id);
                        System.out.println("    That sheet lives at " + offset);

                        Record atPos = findRecordAtPos(offset);
                        System.out.println("    The record at that pos is of type " + atPos.getRecordType());
                        System.out.println("    The record at that pos has class " + atPos.getClass().getName());

                        if (!(atPos instanceof PositionDependentRecord)) {
                            System.out.println("    ** The record class isn't position aware! **");
                        }
                    }
                }

                // Increase the position by the on disk size
                UnsynchronizedByteArrayOutputStream baos = new UnsynchronizedByteArrayOutputStream();
                r.writeOut(baos);
                pos += baos.size();
            }

            System.out.println();

            pos = 0;
            // Now look for UserEditAtoms
            for (org.apache.poi.hslf.record.Record r : ss.getRecords()) {
                if (r instanceof UserEditAtom) {
                    UserEditAtom uea = (UserEditAtom) r;
                    System.out.println("Found UserEditAtom at " + pos + " (" + Integer.toHexString(pos) + ")");
                    System.out.println("  lastUserEditAtomOffset = " + uea.getLastUserEditAtomOffset());
                    System.out.println("  persistPointersOffset  = " + uea.getPersistPointersOffset());
                    System.out.println("  docPersistRef          = " + uea.getDocPersistRef());
                    System.out.println("  maxPersistWritten      = " + uea.getMaxPersistWritten());
                }

                // Increase the position by the on disk size
                UnsynchronizedByteArrayOutputStream baos = new UnsynchronizedByteArrayOutputStream();
                r.writeOut(baos);
                pos += baos.size();
            }

            System.out.println();


            // Query the CurrentUserAtom
            CurrentUserAtom cua = ss.getCurrentUserAtom();
            System.out.println("Checking Current User Atom");
            System.out.println("  Thinks the CurrentEditOffset is " + cua.getCurrentEditOffset());

            System.out.println();
        }
    }


    // Finds the record at a given position
    public static org.apache.poi.hslf.record.Record findRecordAtPos(int pos) {
        long type = LittleEndian.getUShort(fileContents, pos+2);
        long rlen = LittleEndian.getUInt(fileContents, pos+4);

        return Record.createRecordForType(type,fileContents,pos,(int)rlen+8);
    }
}