@Override
	void deserializeIdentifiersOnly(TaskMonitor monitor)
			throws IOException, PdbException, CancelledException {
		PdbByteReader reader = getDirectoryReader();
		deserializeVersionSignatureAge(reader);
		guid = reader.parseGUID();
	}
Constructor
@param msf {@link Msf} foundation for the PDB
@param pdbOptions {@link PdbReaderOptions} used for processing the PDB
@throws IOException upon file IO seek/read issues
@throws PdbException upon unknown value for configuration or error in processing components
Ghidra/Features/PDB/src/main/java/ghidra/app/util/bin/format/pdb2/pdbreader/Pdb700.java