instance method feed

# File actionmailer/lib/action_mailer/vendor/tmail-1.2.7/tmail/vendor/rchardet-1.3/lib/rchardet/sbcharsetprober.rb, line 66
    def feed(aBuf)
      if not @_mModel['keepEnglishLetter']
        aBuf = filter_without_english_letters(aBuf)
      end
      aLen = aBuf.length
      if not aLen
        return get_state()
      end
      aBuf.each_byte do |b|
        c = b.chr
        order = @_mModel['charToOrderMap'][c[0]]
        if order < SYMBOL_CAT_ORDER
          @_mTotalChar += 1
        end
        if order < SAMPLE_SIZE
          @_mFreqChar += 1
          if @_mLastOrder < SAMPLE_SIZE
            @_mTotalSeqs += 1
            if not @_mReversed
              @_mSeqCounters[@_mModel['precedenceMatrix'][(@_mLastOrder * SAMPLE_SIZE) + order]] += 1
            else # reverse the order of the letters in the lookup
              @_mSeqCounters[@_mModel['precedenceMatrix'][(order * SAMPLE_SIZE) + @_mLastOrder]] += 1
            end
          end
        end
        @_mLastOrder = order
      end

      if get_state() == EDetecting
        if @_mTotalSeqs > SB_ENOUGH_REL_THRESHOLD
          cf = get_confidence()
          if cf > POSITIVE_SHORTCUT_THRESHOLD
            $stderr << "#{@_mModel['charsetName']} confidence = #{cf}, we have a winner\n" if $debug
            @_mState = EFoundIt
          elsif cf < NEGATIVE_SHORTCUT_THRESHOLD
            $stderr << "#{@_mModel['charsetName']} confidence = #{cf}, below negative shortcut threshold #{NEGATIVE_SHORTCUT_THRESHOLD}\n" if $debug
            @_mState = ENotMe
          end
        end
      end

      return get_state()
    end