NewReaderDict(r io.Reader, dict []byte) (io.ReadCloser, error) • type Writer – func NewWriter(w io.Writer) *Writer – func NewWriterLevel(w io.Writer, level int) (*Writer, error) – func NewWriterLevelDict(w io.Writer, level int, dict []byte) (*Writer, error) – func (z *Writer) Close() error – func (z *Writer) Flush() error – func (z *Writer) Reset(w io.Writer) – func (z *Writer) Write(p []byte) (n int, err error) • その他、圧縮オプションに関する定数値、エラー型を定義 • 中でflateを呼んでいる