def METHOD_NAME(self, aBuf):
    aBuf = self.filter_with_english_letters(aBuf)
    for c in aBuf:
        charClass = Latin1_CharToClass[wrap_ord(c)]
        freq = Latin1ClassModel[(self._mLastCharClass * CLASS_NUM)
                                + charClass]
        if freq == 0:
            self._mState = eNotMe
            break
        self._mFreqCounter[freq] += 1
        self._mLastCharClass = charClass
    return self.get_state()