class Zip::PassThruCompressor

def <<(data)
  val = data.to_s
  @crc = Zlib.crc32(val, @crc)
  @size += val.bytesize
  @output_stream << val
end

def initialize(output_stream)
  super()
  @output_stream = output_stream
  @crc = Zlib.crc32
  @size = 0
end