@Override
    protected int doDeserializeFromByteArray(byte[] byteArray, int startIndex)
            throws TikaException, IOException {
        AtomicInteger index = new AtomicInteger(startIndex);

        this.extendGUID1 = BasicObject.parse(byteArray, index, ExGuid.class);
        this.extendGUID2 = BasicObject.parse(byteArray, index, ExGuid.class);

        return index.get() - startIndex;
    }
This method is used to deserialize the CellID basic object from the specified byte array and start index.

@param byteArray  Specify the byte array.
@param startIndex Specify the start index from the byte array.
@return Return the length in byte of the CellID basic object.
tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-microsoft-module/src/main/java/org/apache/tika/parser/microsoft/onenote/fsshttpb/streamobj/basic/CellID.java