input_factory      = OpenGzipInputFile; output_factory     = OpenANSIOutputFile;
input_factory      = OpenANSIInputFile; output_factory     = OpenGzipOutputFile;
    GzipTransform() {        filename_transform = GzipFilenameTransform;        input_factory      = OpenGzipInputFile;        output_factory     = OpenANSIOutputFile;    }