'feed a character with known length'

def feed(self, char, char_len):

    if (char_len == 2):
        order = self.get_order(char)
    else:
        order = (-1)
    if (order >= 0):
        self._total_chars += 1
        if (order < self._table_size):
            if (512 > self._char_to_freq_order[order]):
                self._freq_chars += 1
