code: def create_gnu_header(self, info, encoding, errors):
          
          info["magic"] = GNU_MAGIC
  
          buf = b""
          if len(info["linkname"]) > LENGTH_LINK:
              buf += self._create_gnu_long_header(info["linkname"], GNUTYPE_LONGLINK, encoding, errors)
  
          if len(info["name"]) > LENGTH_NAME:
              buf += self._create_gnu_long_header(info["name"], GNUTYPE_LONGNAME, encoding, errors)
  
          return buf + self._create_header(info, GNU_FORMAT, encoding, errors)
docs: Return the object as a GNU header block sequence.