compress.go
func WriteDeflate(w io.Writer, p []byte) (int, error) {
	return WriteDeflateLevel(w, p, CompressDefaultCompression)
}
func WriteDeflate(w io.Writer, p []byte) (int, error) {
	return WriteDeflateLevel(w, p, CompressDefaultCompression)
}
// WriteDeflate writes deflated p to w and returns the number of compressed
// bytes written to w.