code: def _iter_table_records(self):
          
          count = self._table_count
          bufr = self._stream.read(offset=12, length=count*16)
          tmpl = '>4sLLL'
          for i in range(count):
              offset = i * 16
              tag, checksum, off, len_ = unpack_from(tmpl, bufr, offset)
              yield tag.decode('utf-8'), off, len_
docs: Generate a (tag, offset, length) 3-tuple for each of the tables in
          this font file.