127 lines
3.3 KiB
Go
127 lines
3.3 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/dsnet/compress/bzip2"
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)
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// TarBz2 facilitates bzip2 compression
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// (https://github.com/dsnet/compress/blob/master/doc/bzip2-format.pdf)
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// of tarball archives.
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type TarBz2 struct {
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*Tar
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CompressionLevel int
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}
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// CheckExt ensures the file extension matches the format.
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func (*TarBz2) CheckExt(filename string) error {
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if !strings.HasSuffix(filename, ".tar.bz2") &&
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!strings.HasSuffix(filename, ".tbz2") {
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return fmt.Errorf("filename must have a .tar.bz2 or .tbz2 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.bz2" or ".tbz2". 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 (tbz2 *TarBz2) Archive(sources []string, destination string) error {
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err := tbz2.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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tbz2.wrapWriter()
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return tbz2.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 (tbz2 *TarBz2) Unarchive(source, destination string) error {
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tbz2.wrapReader()
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return tbz2.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 (tbz2 *TarBz2) Walk(archive string, walkFn WalkFunc) error {
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tbz2.wrapReader()
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return tbz2.Tar.Walk(archive, walkFn)
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}
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// Create opens tbz2 for writing a compressed
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// tar archive to out.
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func (tbz2 *TarBz2) Create(out io.Writer) error {
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tbz2.wrapWriter()
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return tbz2.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 (tbz2 *TarBz2) Open(in io.Reader, size int64) error {
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tbz2.wrapReader()
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return tbz2.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 (tbz2 *TarBz2) Extract(source, target, destination string) error {
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tbz2.wrapReader()
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return tbz2.Tar.Extract(source, target, destination)
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}
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func (tbz2 *TarBz2) wrapWriter() {
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var bz2w *bzip2.Writer
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tbz2.Tar.writerWrapFn = func(w io.Writer) (io.Writer, error) {
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var err error
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bz2w, err = bzip2.NewWriter(w, &bzip2.WriterConfig{
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Level: tbz2.CompressionLevel,
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})
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return bz2w, err
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}
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tbz2.Tar.cleanupWrapFn = func() {
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bz2w.Close()
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}
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}
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func (tbz2 *TarBz2) wrapReader() {
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var bz2r *bzip2.Reader
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tbz2.Tar.readerWrapFn = func(r io.Reader) (io.Reader, error) {
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var err error
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bz2r, err = bzip2.NewReader(r, nil)
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return bz2r, err
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}
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tbz2.Tar.cleanupWrapFn = func() {
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bz2r.Close()
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}
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}
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func (tbz2 *TarBz2) String() string { return "tar.bz2" }
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// NewTarBz2 returns a new, default instance ready to be customized and used.
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func NewTarBz2() *TarBz2 {
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return &TarBz2{
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CompressionLevel: bzip2.DefaultCompression,
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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(TarBz2))
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_ = Writer(new(TarBz2))
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_ = Archiver(new(TarBz2))
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_ = Unarchiver(new(TarBz2))
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_ = Walker(new(TarBz2))
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_ = Extractor(new(TarBz2))
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)
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// DefaultTarBz2 is a convenient archiver ready to use.
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var DefaultTarBz2 = NewTarBz2()
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