code: def _ReadRecordHeader(self, file_object, record_header_offset):
      
      data_type_map = self._GetDataTypeMap('keychain_record_header')
  
      record_header, _ = self._ReadStructureFromFileObject(
          file_object, record_header_offset, data_type_map)
  
      return record_header
docs: Reads the record header.
  
      Args:
        file_object (file): file-like object.
        record_header_offset (int): offset of the record header relative to
            the start of the file.
  
      Returns:
        keychain_record_header: record header.
  
      Raises:
        ParseError: if the record header cannot be read.