Read chunk from file at specified position. If this was the last chunk,
sets the eof property. Returns a null chunk in case of error.

def read(self, bytes, offset):
        """
        Read chunk from file at specified position. If this was the last chunk,
sets the eof property. Returns a null chunk in case of error.
        """
        return Zchunk(lib.zfile_read(self._as_parameter_, bytes, offset), True)