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gitea/vendor/github.com/mholt/archiver/v3/sz.go

52 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()