121 lines
3.1 KiB
Go
121 lines
3.1 KiB
Go
package archiver
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import (
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"fmt"
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"io"
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"strings"
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"github.com/klauspost/compress/zstd"
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)
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// TarZstd facilitates Zstandard compression
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// (RFC 8478) of tarball archives.
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type TarZstd struct {
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*Tar
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}
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// CheckExt ensures the file extension matches the format.
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func (*TarZstd) CheckExt(filename string) error {
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if !strings.HasSuffix(filename, ".tar.zst") {
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return fmt.Errorf("filename must have a .tar.zst extension")
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}
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return nil
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}
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// Archive creates a compressed tar file at destination
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// containing the files listed in sources. The destination
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// must end with ".tar.zst" or ".tzst". File paths can be
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// those of regular files or directories; directories will
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// be recursively added.
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func (tzst *TarZstd) Archive(sources []string, destination string) error {
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err := tzst.CheckExt(destination)
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if err != nil {
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return fmt.Errorf("output %s", err.Error())
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}
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tzst.wrapWriter()
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return tzst.Tar.Archive(sources, destination)
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}
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// Unarchive unpacks the compressed tarball at
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// source to destination. Destination will be
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// treated as a folder name.
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func (tzst *TarZstd) Unarchive(source, destination string) error {
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tzst.wrapReader()
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return tzst.Tar.Unarchive(source, destination)
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}
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// Walk calls walkFn for each visited item in archive.
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func (tzst *TarZstd) Walk(archive string, walkFn WalkFunc) error {
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tzst.wrapReader()
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return tzst.Tar.Walk(archive, walkFn)
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}
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// Create opens txz for writing a compressed
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// tar archive to out.
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func (tzst *TarZstd) Create(out io.Writer) error {
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tzst.wrapWriter()
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return tzst.Tar.Create(out)
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}
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// Open opens t for reading a compressed archive from
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// in. The size parameter is not used.
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func (tzst *TarZstd) Open(in io.Reader, size int64) error {
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tzst.wrapReader()
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return tzst.Tar.Open(in, size)
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}
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// Extract extracts a single file from the tar archive.
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// If the target is a directory, the entire folder will
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// be extracted into destination.
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func (tzst *TarZstd) Extract(source, target, destination string) error {
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tzst.wrapReader()
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return tzst.Tar.Extract(source, target, destination)
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}
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func (tzst *TarZstd) wrapWriter() {
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var zstdw *zstd.Encoder
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tzst.Tar.writerWrapFn = func(w io.Writer) (io.Writer, error) {
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var err error
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zstdw, err = zstd.NewWriter(w)
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return zstdw, err
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}
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tzst.Tar.cleanupWrapFn = func() {
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zstdw.Close()
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}
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}
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func (tzst *TarZstd) wrapReader() {
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var zstdr *zstd.Decoder
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tzst.Tar.readerWrapFn = func(r io.Reader) (io.Reader, error) {
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var err error
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zstdr, err = zstd.NewReader(r)
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return zstdr, err
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}
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tzst.Tar.cleanupWrapFn = func() {
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zstdr.Close()
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}
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}
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func (tzst *TarZstd) String() string { return "tar.zst" }
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// NewTarZstd returns a new, default instance ready to be customized and used.
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func NewTarZstd() *TarZstd {
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return &TarZstd{
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Tar: NewTar(),
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}
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}
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// Compile-time checks to ensure type implements desired interfaces.
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var (
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_ = Reader(new(TarZstd))
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_ = Writer(new(TarZstd))
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_ = Archiver(new(TarZstd))
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_ = Unarchiver(new(TarZstd))
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_ = Walker(new(TarZstd))
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_ = ExtensionChecker(new(TarZstd))
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_ = Extractor(new(TarZstd))
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)
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// DefaultTarZstd is a convenient archiver ready to use.
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var DefaultTarZstd = NewTarZstd()
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