def findTypeName(name, typ, body):
    """ Return the the portal type (an ID) for a PUT request.

        o 'name' is the filename supplied as the end of the path of the
          PUT request.

        o 'typ' is the MIME type for the request (which may have been guessed
          already from the extension or the body).

        o 'body' is the actual payload of the PUT request.

        o Return None if no match found.
        """
