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