gitea/vendor/github.com/mholt/archiver/v3/zstd.go
6543 30ce3731a1
Vendor Update Go Libs (#13444)
* denisenkom/go-mssqldb untagged -> v0.9.0

* github.com/editorconfig/editorconfig-core-go v2.3.7 -> v2.3.8

* github.com/go-testfixtures/testfixtures v3.4.0 -> v3.4.1

* github.com/mholt/archiver v3.3.2 -> v3.5.0

* github.com/olivere/elastic v7.0.20 -> v7.0.21

* github.com/urfave/cli v1.22.4 -> v1.22.5

* github.com/xanzy/go-gitlab v0.38.1 -> v0.39.0

* github.com/yuin/goldmark-meta untagged -> v1.0.0

* github.com/ethantkoenig/rupture 0a76f03a811a -> c3b3b810dc77

* github.com/jaytaylor/html2text 8fb95d837f7d -> 3577fbdbcff7

* github.com/kballard/go-shellquote cd60e84ee657 -> 95032a82bc51

* github.com/msteinert/pam 02ccfbfaf0cc -> 913b8f8cdf8b

* github.com/unknwon/paginater 7748a72e0141 -> 042474bd0eae

* CI.restart()

Co-authored-by: techknowlogick <techknowlogick@gitea.io>
2020-11-06 13:41:42 -05:00

62 lines
1.4 KiB
Go
Vendored

package archiver
import (
"fmt"
"io"
"path/filepath"
"github.com/klauspost/compress/zstd"
)
// Zstd facilitates Zstandard compression.
type Zstd struct {
EncoderOptions []zstd.EOption
DecoderOptions []zstd.DOption
}
// Compress reads in, compresses it, and writes it to out.
func (zs *Zstd) Compress(in io.Reader, out io.Writer) error {
w, err := zstd.NewWriter(out, zs.EncoderOptions...)
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 (zs *Zstd) Decompress(in io.Reader, out io.Writer) error {
r, err := zstd.NewReader(in, zs.DecoderOptions...)
if err != nil {
return err
}
defer r.Close()
_, err = io.Copy(out, r)
return err
}
// CheckExt ensures the file extension matches the format.
func (zs *Zstd) CheckExt(filename string) error {
if filepath.Ext(filename) != ".zst" {
return fmt.Errorf("filename must have a .zst extension")
}
return nil
}
func (zs *Zstd) String() string { return "zstd" }
// NewZstd returns a new, default instance ready to be customized and used.
func NewZstd() *Zstd {
return new(Zstd)
}
// Compile-time checks to ensure type implements desired interfaces.
var (
_ = Compressor(new(Zstd))
_ = Decompressor(new(Zstd))
)
// DefaultZstd is a default instance that is conveniently ready to use.
var DefaultZstd = NewZstd()