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

115 lines
2.9 KiB

package archiver
import (
"fmt"
"io"
"strings"
"github.com/golang/snappy"
)
// TarSz facilitates Snappy compression
// (https://github.com/google/snappy)
// of tarball archives.
type TarSz struct {
*Tar
}
// CheckExt ensures the file extension matches the format.
func (*TarSz) CheckExt(filename string) error {
if !strings.HasSuffix(filename, ".tar.sz") &&
!strings.HasSuffix(filename, ".tsz") {
return fmt.Errorf("filename must have a .tar.sz or .tsz extension")
}
return nil
}
// Archive creates a compressed tar file at destination
// containing the files listed in sources. The destination
// must end with ".tar.sz" or ".tsz". File paths can be
// those of regular files or directories; directories will
// be recursively added.
func (tsz *TarSz) Archive(sources []string, destination string) error {
err := tsz.CheckExt(destination)
if err != nil {
return fmt.Errorf("output %s", err.Error())
}
tsz.wrapWriter()
return tsz.Tar.Archive(sources, destination)
}
// Unarchive unpacks the compressed tarball at
// source to destination. Destination will be
// treated as a folder name.
func (tsz *TarSz) Unarchive(source, destination string) error {
tsz.wrapReader()
return tsz.Tar.Unarchive(source, destination)
}
// Walk calls walkFn for each visited item in archive.
func (tsz *TarSz) Walk(archive string, walkFn WalkFunc) error {
tsz.wrapReader()
return tsz.Tar.Walk(archive, walkFn)
}
// Create opens tsz for writing a compressed
// tar archive to out.
func (tsz *TarSz) Create(out io.Writer) error {
tsz.wrapWriter()
return tsz.Tar.Create(out)
}
// Open opens t for reading a compressed archive from
// in. The size parameter is not used.
func (tsz *TarSz) Open(in io.Reader, size int64) error {
tsz.wrapReader()
return tsz.Tar.Open(in, size)
}
// Extract extracts a single file from the tar archive.
// If the target is a directory, the entire folder will
// be extracted into destination.
func (tsz *TarSz) Extract(source, target, destination string) error {
tsz.wrapReader()
return tsz.Tar.Extract(source, target, destination)
}
func (tsz *TarSz) wrapWriter() {
var sw *snappy.Writer
tsz.Tar.writerWrapFn = func(w io.Writer) (io.Writer, error) {
sw = snappy.NewBufferedWriter(w)
return sw, nil
}
tsz.Tar.cleanupWrapFn = func() {
sw.Close()
}
}
func (tsz *TarSz) wrapReader() {
tsz.Tar.readerWrapFn = func(r io.Reader) (io.Reader, error) {
return snappy.NewReader(r), nil
}
}
func (tsz *TarSz) String() string { return "tar.sz" }
// NewTarSz returns a new, default instance ready to be customized and used.
func NewTarSz() *TarSz {
return &TarSz{
Tar: NewTar(),
}
}
// Compile-time checks to ensure type implements desired interfaces.
var (
_ = Reader(new(TarSz))
_ = Writer(new(TarSz))
_ = Archiver(new(TarSz))
_ = Unarchiver(new(TarSz))
_ = Walker(new(TarSz))
_ = Extractor(new(TarSz))
)
// DefaultTarSz is a convenient archiver ready to use.
var DefaultTarSz = NewTarSz()