forked from gitea/gitea
65 lines
1.4 KiB
Go
65 lines
1.4 KiB
Go
package archiver
|
|
|
|
import (
|
|
"fmt"
|
|
"io"
|
|
"path/filepath"
|
|
|
|
"github.com/dsnet/compress/bzip2"
|
|
)
|
|
|
|
// Bz2 facilitates bzip2 compression.
|
|
type Bz2 struct {
|
|
CompressionLevel int
|
|
}
|
|
|
|
// Compress reads in, compresses it, and writes it to out.
|
|
func (bz *Bz2) Compress(in io.Reader, out io.Writer) error {
|
|
w, err := bzip2.NewWriter(out, &bzip2.WriterConfig{
|
|
Level: bz.CompressionLevel,
|
|
})
|
|
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 (bz *Bz2) Decompress(in io.Reader, out io.Writer) error {
|
|
r, err := bzip2.NewReader(in, nil)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer r.Close()
|
|
_, err = io.Copy(out, r)
|
|
return err
|
|
}
|
|
|
|
// CheckExt ensures the file extension matches the format.
|
|
func (bz *Bz2) CheckExt(filename string) error {
|
|
if filepath.Ext(filename) != ".bz2" {
|
|
return fmt.Errorf("filename must have a .bz2 extension")
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (bz *Bz2) String() string { return "bz2" }
|
|
|
|
// NewBz2 returns a new, default instance ready to be customized and used.
|
|
func NewBz2() *Bz2 {
|
|
return &Bz2{
|
|
CompressionLevel: bzip2.DefaultCompression,
|
|
}
|
|
}
|
|
|
|
// Compile-time checks to ensure type implements desired interfaces.
|
|
var (
|
|
_ = Compressor(new(Bz2))
|
|
_ = Decompressor(new(Bz2))
|
|
)
|
|
|
|
// DefaultBz2 is a default instance that is conveniently ready to use.
|
|
var DefaultBz2 = NewBz2()
|