text: ######################## BEGIN LICENSE BLOCK ########################
  # The Original Code is Mozilla Universal charset detector code.
  #
  # The Initial Developer of the Original Code is
  # Netscape Communications Corporation.
  # Portions created by the Initial Developer are Copyright (C) 2001
  # the Initial Developer. All Rights Reserved.
  #
  # Contributor(s):
  #   Mark Pilgrim - port to Python
  #   Shy Shalom - original C code
  #   Proofpoint, Inc.
  #
  # This library is free software; you can redistribute it and/or
  # modify it under the terms of the GNU Lesser General Public
  # License as published by the Free Software Foundation; either
  # version 2.1 of the License, or (at your option) any later version.
  #
  # This library is distributed in the hope that it will be useful,
  # but WITHOUT ANY WARRANTY; without even the implied warranty of
  # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  # Lesser General Public License for more details.
  #
  # You should have received a copy of the GNU Lesser General Public
  # License along with this library; if not, write to the Free Software
  # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  # 02110-1301  USA
  ######################### END LICENSE BLOCK #########################
  
  from .charsetprober import CharSetProber
  from .enums import ProbingState, MachineState
  
  
  class MultiByteCharSetProber(CharSetProber):
      """
      MultiByteCharSetProber
      """
  
      def __init__(self, lang_filter=None):
          super(MultiByteCharSetProber, self).__init__(lang_filter=lang_filter)
          self.distribution_analyzer = None
          self.coding_sm = None
          self._last_char = [0, 0]
  
      def reset(self):
          super(MultiByteCharSetProber, self).reset()
          if self.coding_sm:
              self.coding_sm.reset()
          if self.distribution_analyzer:
              self.distribution_analyzer.reset()
          self._last_char = [0, 0]
  
      @property
      def charset_name(self):
          raise NotImplementedError
  
      @property
      def language(self):
          raise NotImplementedError
  
      def feed(self, byte_str):
          for i in range(len(byte_str)):
              coding_state = self.coding_sm.next_state(byte_str[i])
              if coding_state == MachineState.ERROR:
                  self.logger.debug('%s %s prober hit error at byte %s',
                                    self.charset_name, self.language, i)
                  self._state = ProbingState.NOT_ME
                  break
              elif coding_state == MachineState.ITS_ME:
                  self._state = ProbingState.FOUND_IT
                  break
              elif coding_state == MachineState.START:
                  char_len = self.coding_sm.get_current_charlen()
                  if i == 0:
                      self._last_char[1] = byte_str[0]
                      self.distribution_analyzer.feed(self._last_char, char_len)
                  else:
                      self.distribution_analyzer.feed(byte_str[i - 1:i + 1],
                                                      char_len)
  
          self._last_char[0] = byte_str[-1]
  
          if self.state == ProbingState.DETECTING:
              if (self.distribution_analyzer.got_enough_data() and
                      (self.get_confidence() > self.SHORTCUT_THRESHOLD)):
                  self._state = ProbingState.FOUND_IT
  
          return self.state
  
      def get_confidence(self):
          return self.distribution_analyzer.get_confidence()
  