code: def create_ustar_header(self, info, encoding, errors):
          
          info["magic"] = POSIX_MAGIC
  
          if len(info["linkname"]) > LENGTH_LINK:
              raise ValueError("linkname is too long")
  
          if len(info["name"]) > LENGTH_NAME:
              info["prefix"], info["name"] = self._posix_split_name(info["name"])
  
          return self._create_header(info, USTAR_FORMAT, encoding, errors)
docs: Return the object as a ustar header block.