private void processHeader() throws PdbException {
		int sizeField = reader.parseInt();
		if (sizeField + 4 != reader.getLimit()) {
			throw new PdbException(
				String.format("Error in module global refs size field: %d != %d", sizeField,
					reader.getLimit()));
		}
	}
Reads and validates size field; leaves reader pointing at first record.
@throws PdbException upon not enough data left to parse
Ghidra/Features/PDB/src/main/java/ghidra/app/util/bin/format/pdb2/pdbreader/GlobalReferenceOffsetIterator.java