instance method feed

# File actionmailer/lib/action_mailer/vendor/tmail-1.2.7/tmail/vendor/rchardet-1.3/lib/rchardet/mbcharsetprober.rb, line 54
    def feed(aBuf)
      aLen = aBuf.length
      for i in (0...aLen)
        codingState = @_mCodingSM.next_state(aBuf[i..i])
        if codingState == EError
          $stderr << "#{get_charset_name} prober hit error at byte #{i}\n" if $debug
          @_mState = ENotMe
          break
        elsif codingState == EItsMe
          @_mState = EFoundIt
          break
        elsif codingState == EStart
          charLen = @_mCodingSM.get_current_charlen()
          if i == 0
            @_mLastChar[1] = aBuf[0..0]
            @_mDistributionAnalyzer.feed(@_mLastChar, charLen)
          else
            @_mDistributionAnalyzer.feed(aBuf[i-1...i+1], charLen)
          end
        end
      end
      @_mLastChar[0] = aBuf[aLen-1..aLen-1]

      if get_state() == EDetecting
        if @_mDistributionAnalyzer.got_enough_data() and (get_confidence() > SHORTCUT_THRESHOLD)
          @_mState = EFoundIt
        end
      end
      return get_state()
    end