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

59 lines
1.2 KiB

package archiver
import (
"fmt"
"io"
"path/filepath"
"github.com/ulikunitz/xz"
fastxz "github.com/xi2/xz"
)
// Xz facilitates XZ compression.
type Xz struct{}
// Compress reads in, compresses it, and writes it to out.
func (x *Xz) Compress(in io.Reader, out io.Writer) error {
w, err := xz.NewWriter(out)
if err != nil {
return err
}
defer w.Close()
_, err = io.Copy(w, in)
return err
}
// Decompress reads in, decompresses it, and writes it to out.
func (x *Xz) Decompress(in io.Reader, out io.Writer) error {
r, err := fastxz.NewReader(in, 0)
if err != nil {
return err
}
_, err = io.Copy(out, r)
return err
}
// CheckExt ensures the file extension matches the format.
func (x *Xz) CheckExt(filename string) error {
if filepath.Ext(filename) != ".xz" {
return fmt.Errorf("filename must have a .xz extension")
}
return nil
}
func (x *Xz) String() string { return "xz" }
// NewXz returns a new, default instance ready to be customized and used.
func NewXz() *Xz {
return new(Xz)
}
// Compile-time checks to ensure type implements desired interfaces.
var (
_ = Compressor(new(Xz))
_ = Decompressor(new(Xz))
)
// DefaultXz is a default instance that is conveniently ready to use.
var DefaultXz = NewXz()