code: public ExportSection loadExportSection() throws IOException {
          Optional<ExportSection> edata = maybeLoadExportSection();
          return (ExportSection) getOrThrow(edata,
                  "unable to load export section");
      }
docs: Loads all bytes and information of the export section. The file on disk
  is read to fetch the information.
  
  @return the export section
  @throws IOException
  if unable to read the file
  @throws IllegalStateException
  if unable to load section