Initial DDC release

internal/extract/tar.go

@@ -0,0 +1,61 @@
+package extract
+
+import (
+	"archive/tar"
+	"compress/bzip2"
+	"compress/gzip"
+	"errors"
+	"io"
+	"os"
+)
+
+func extractTar(archivePath string, archiveFormat format, writer *entryWriter) error {
+	file, err := os.Open(archivePath)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+
+	if archiveFormat == formatTar {
+		if info, err := file.Stat(); err == nil {
+			writer.progress.SetTotal(info.Size())
+		}
+	}
+
+	source, err := decompress(file, archiveFormat)
+	if err != nil {
+		return err
+	}
+
+	reader := tar.NewReader(source)
+	for {
+		header, err := reader.Next()
+		if errors.Is(err, io.EOF) {
+			return nil
+		}
+		if err != nil {
+			return err
+		}
+
+		switch header.Typeflag {
+		case tar.TypeDir:
+			err = writer.writeDirectory(header.Name)
+		case tar.TypeReg:
+			err = writer.writeFile(header.Name, reader)
+		}
+		if err != nil {
+			return err
+		}
+	}
+}
+
+func decompress(file *os.File, archiveFormat format) (io.Reader, error) {
+	switch archiveFormat {
+	case formatTarGzip:
+		return gzip.NewReader(file)
+	case formatTarBzip2:
+		return bzip2.NewReader(file), nil
+	default:
+		return file, nil
+	}
+}