Платформа ЦРНП "Мирокод" для разработки проектов
https://git.mirocod.ru
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
51 lines
1.2 KiB
51 lines
1.2 KiB
package archiver |
|
|
|
import ( |
|
"fmt" |
|
"io" |
|
"path/filepath" |
|
|
|
"github.com/golang/snappy" |
|
) |
|
|
|
// Snappy facilitates Snappy compression. |
|
type Snappy struct{} |
|
|
|
// Compress reads in, compresses it, and writes it to out. |
|
func (s *Snappy) Compress(in io.Reader, out io.Writer) error { |
|
w := snappy.NewBufferedWriter(out) |
|
defer w.Close() |
|
_, err := io.Copy(w, in) |
|
return err |
|
} |
|
|
|
// Decompress reads in, decompresses it, and writes it to out. |
|
func (s *Snappy) Decompress(in io.Reader, out io.Writer) error { |
|
r := snappy.NewReader(in) |
|
_, err := io.Copy(out, r) |
|
return err |
|
} |
|
|
|
// CheckExt ensures the file extension matches the format. |
|
func (s *Snappy) CheckExt(filename string) error { |
|
if filepath.Ext(filename) != ".sz" { |
|
return fmt.Errorf("filename must have a .sz extension") |
|
} |
|
return nil |
|
} |
|
|
|
func (s *Snappy) String() string { return "sz" } |
|
|
|
// NewSnappy returns a new, default instance ready to be customized and used. |
|
func NewSnappy() *Snappy { |
|
return new(Snappy) |
|
} |
|
|
|
// Compile-time checks to ensure type implements desired interfaces. |
|
var ( |
|
_ = Compressor(new(Snappy)) |
|
_ = Decompressor(new(Snappy)) |
|
) |
|
|
|
// DefaultSnappy is a default instance that is conveniently ready to use. |
|
var DefaultSnappy = NewSnappy()
|
|
|