def do_deflate(data, flush)
      if data.nil? then
        run '', Zlib::FINISH
      else
        data = StringValue data

        if flush != Zlib::NO_FLUSH or not data.empty? then # prevent BUF_ERROR
          run data, flush
        end
      end
    end
def do_deflate(data, flush)
      if data.nil? then
        run '', Zlib::FINISH
      else
        data = StringValue data

        if flush != Zlib::NO_FLUSH or not data.empty? then # prevent BUF_ERROR
          run data, flush
        end
      end
    end
def do_deflate ( data , flush ) if data . nil? then run '' , Zlib :: FINISH else data = StringValue data if flush != Zlib :: NO_FLUSH or not data . empty? then # prevent BUF_ERROR run data , flush end end end
Performs the deflate operation and leaves the compressed data in the
 output buffer
Performs the deflate operation and leaves the compressed data in the output buffer