mirror of https://github.com/go-gitea/gitea.git
115 lines
3.0 KiB
Go
115 lines
3.0 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/andybalholm/brotli"
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)
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// TarBrotli facilitates brotli compression of tarball archives.
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type TarBrotli struct {
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*Tar
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Quality int
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}
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// CheckExt ensures the file extension matches the format.
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func (*TarBrotli) CheckExt(filename string) error {
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if !strings.HasSuffix(filename, ".tar.br") &&
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!strings.HasSuffix(filename, ".tbr") {
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return fmt.Errorf("filename must have a .tar.br or .tbr 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.br" or ".tbr". 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 (tbr *TarBrotli) Archive(sources []string, destination string) error {
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err := tbr.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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tbr.wrapWriter()
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return tbr.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 (tbr *TarBrotli) Unarchive(source, destination string) error {
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tbr.wrapReader()
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return tbr.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 (tbr *TarBrotli) Walk(archive string, walkFn WalkFunc) error {
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tbr.wrapReader()
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return tbr.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 (tbr *TarBrotli) Create(out io.Writer) error {
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tbr.wrapWriter()
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return tbr.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 (tbr *TarBrotli) Open(in io.Reader, size int64) error {
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tbr.wrapReader()
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return tbr.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 (tbr *TarBrotli) Extract(source, target, destination string) error {
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tbr.wrapReader()
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return tbr.Tar.Extract(source, target, destination)
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}
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func (tbr *TarBrotli) wrapWriter() {
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var brw *brotli.Writer
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tbr.Tar.writerWrapFn = func(w io.Writer) (io.Writer, error) {
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brw = brotli.NewWriterLevel(w, tbr.Quality)
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return brw, nil
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}
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tbr.Tar.cleanupWrapFn = func() {
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brw.Close()
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}
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}
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func (tbr *TarBrotli) wrapReader() {
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tbr.Tar.readerWrapFn = func(r io.Reader) (io.Reader, error) {
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return brotli.NewReader(r), nil
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}
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}
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func (tbr *TarBrotli) String() string { return "tar.br" }
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// NewTarBrotli returns a new, default instance ready to be customized and used.
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func NewTarBrotli() *TarBrotli {
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return &TarBrotli{
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Tar: NewTar(),
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Quality: brotli.DefaultCompression,
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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(TarBrotli))
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_ = Writer(new(TarBrotli))
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_ = Archiver(new(TarBrotli))
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_ = Unarchiver(new(TarBrotli))
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_ = Walker(new(TarBrotli))
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_ = Extractor(new(TarBrotli))
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)
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// DefaultTarBrotli is a convenient archiver ready to use.
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var DefaultTarBrotli = NewTarBrotli()
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