'Close the TarFile. In write-mode, two finishing zero blocks are
appended to the archive.'

def close(self):

    if self.closed:
        return
    if (self.mode in 'aw'):
        self.fileobj.write((NUL * (BLOCKSIZE * 2)))
        self.offset += (BLOCKSIZE * 2)
        (blocks, remainder) = divmod(self.offset, RECORDSIZE)
        if (remainder > 0):
            self.fileobj.write((NUL * (RECORDSIZE - remainder)))
    if (not self._extfileobj):
        self.fileobj.close()
    self.closed = True
