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gitea/vendor/github.com/mholt/archiver/v3/lz4.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

64 lines
1.5 KiB
Go
Vendored

package archiver
import (
"fmt"
"io"
"path/filepath"
"github.com/pierrec/lz4/v4"
)
// Lz4 facilitates LZ4 compression.
type Lz4 struct {
CompressionLevel int
}
// Compress reads in, compresses it, and writes it to out.
func (lz *Lz4) Compress(in io.Reader, out io.Writer) error {
w := lz4.NewWriter(out)
// TODO archiver v4: use proper lz4.Fast
// bitshifting for backwards compatibility with lz4/v3
options := []lz4.Option{
lz4.CompressionLevelOption(lz4.CompressionLevel(1 << (8 + lz.CompressionLevel))),
}
if err := w.Apply(options...); 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 (lz *Lz4) Decompress(in io.Reader, out io.Writer) error {
r := lz4.NewReader(in)
_, err := io.Copy(out, r)
return err
}
// CheckExt ensures the file extension matches the format.
func (lz *Lz4) CheckExt(filename string) error {
if filepath.Ext(filename) != ".lz4" {
return fmt.Errorf("filename must have a .lz4 extension")
}
return nil
}
func (lz *Lz4) String() string { return "lz4" }
// NewLz4 returns a new, default instance ready to be customized and used.
func NewLz4() *Lz4 {
return &Lz4{
CompressionLevel: 9, // https://github.com/lz4/lz4/blob/1b819bfd633ae285df2dfe1b0589e1ec064f2873/lib/lz4hc.h#L48
}
}
// Compile-time checks to ensure type implements desired interfaces.
var (
_ = Compressor(new(Lz4))
_ = Decompressor(new(Lz4))
)
// DefaultLz4 is a default instance that is conveniently ready to use.
var DefaultLz4 = NewLz4()