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

137 lines
3.4 KiB

package archiver
import (
"compress/gzip"
"fmt"
"io"
"strings"
pgzip "github.com/klauspost/pgzip"
)
// TarGz facilitates gzip compression
// (RFC 1952) of tarball archives.
type TarGz struct {
*Tar
// The compression level to use, as described
// in the compress/gzip package.
CompressionLevel int
// Disables parallel gzip.
SingleThreaded bool
}
// CheckExt ensures the file extension matches the format.
func (*TarGz) CheckExt(filename string) error {
if !strings.HasSuffix(filename, ".tar.gz") &&
!strings.HasSuffix(filename, ".tgz") {
return fmt.Errorf("filename must have a .tar.gz or .tgz extension")
}
return nil
}
// Archive creates a compressed tar file at destination
// containing the files listed in sources. The destination
// must end with ".tar.gz" or ".tgz". File paths can be
// those of regular files or directories; directories will
// be recursively added.
func (tgz *TarGz) Archive(sources []string, destination string) error {
err := tgz.CheckExt(destination)
if err != nil {
return fmt.Errorf("output %s", err.Error())
}
tgz.wrapWriter()
return tgz.Tar.Archive(sources, destination)
}
// Unarchive unpacks the compressed tarball at
// source to destination. Destination will be
// treated as a folder name.
func (tgz *TarGz) Unarchive(source, destination string) error {
tgz.wrapReader()
return tgz.Tar.Unarchive(source, destination)
}
// Walk calls walkFn for each visited item in archive.
func (tgz *TarGz) Walk(archive string, walkFn WalkFunc) error {
tgz.wrapReader()
return tgz.Tar.Walk(archive, walkFn)
}
// Create opens txz for writing a compressed
// tar archive to out.
func (tgz *TarGz) Create(out io.Writer) error {
tgz.wrapWriter()
return tgz.Tar.Create(out)
}
// Open opens t for reading a compressed archive from
// in. The size parameter is not used.
func (tgz *TarGz) Open(in io.Reader, size int64) error {
tgz.wrapReader()
return tgz.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 (tgz *TarGz) Extract(source, target, destination string) error {
tgz.wrapReader()
return tgz.Tar.Extract(source, target, destination)
}
func (tgz *TarGz) wrapWriter() {
var gzw io.WriteCloser
tgz.Tar.writerWrapFn = func(w io.Writer) (io.Writer, error) {
var err error
if tgz.SingleThreaded {
gzw, err = gzip.NewWriterLevel(w, tgz.CompressionLevel)
} else {
gzw, err = pgzip.NewWriterLevel(w, tgz.CompressionLevel)
}
return gzw, err
}
tgz.Tar.cleanupWrapFn = func() {
gzw.Close()
}
}
func (tgz *TarGz) wrapReader() {
var gzr io.ReadCloser
tgz.Tar.readerWrapFn = func(r io.Reader) (io.Reader, error) {
var err error
if tgz.SingleThreaded {
gzr, err = gzip.NewReader(r)
} else {
gzr, err = pgzip.NewReader(r)
}
return gzr, err
}
tgz.Tar.cleanupWrapFn = func() {
gzr.Close()
}
}
func (tgz *TarGz) String() string { return "tar.gz" }
// NewTarGz returns a new, default instance ready to be customized and used.
func NewTarGz() *TarGz {
return &TarGz{
CompressionLevel: gzip.DefaultCompression,
Tar: NewTar(),
}
}
// Compile-time checks to ensure type implements desired interfaces.
var (
_ = Reader(new(TarGz))
_ = Writer(new(TarGz))
_ = Archiver(new(TarGz))
_ = Unarchiver(new(TarGz))
_ = Walker(new(TarGz))
_ = Extractor(new(TarGz))
)
// DefaultTarGz is a convenient archiver ready to use.
var DefaultTarGz = NewTarGz()