Example #1
0
func maybeDecompress(rs io.ReadSeeker) (io.Reader, error) {
	// TODO(jonboulle): this is a bit redundant with detectValType
	typ, err := aci.DetectFileType(rs)
	if err != nil {
		return nil, err
	}
	if _, err := rs.Seek(0, 0); err != nil {
		return nil, err
	}
	var r io.Reader
	switch typ {
	case aci.TypeGzip:
		r, err = gzip.NewReader(rs)
		if err != nil {
			return nil, fmt.Errorf("error reading gzip: %v", err)
		}
	case aci.TypeBzip2:
		r = bzip2.NewReader(rs)
	case aci.TypeXz:
		r = aci.XzReader(rs)
	case aci.TypeTar:
		r = rs
	case aci.TypeUnknown:
		return nil, errors.New("unknown filetype")
	default:
		// should never happen
		panic(fmt.Sprintf("bad type returned from DetectFileType: %v", typ))
	}
	return r, nil
}
Example #2
0
func decompress(rs io.Reader, typ aci.FileType) (io.Reader, error) {
	var (
		dr  io.Reader
		err error
	)
	switch typ {
	case aci.TypeGzip:
		dr, err = gzip.NewReader(rs)
		if err != nil {
			return nil, err
		}
	case aci.TypeBzip2:
		dr = bzip2.NewReader(rs)
	case aci.TypeXz:
		dr = aci.XzReader(rs)
	case aci.TypeTar:
		dr = rs
	case aci.TypeUnknown:
		return nil, errors.New("error: unknown image filetype")
	default:
		return nil, errors.New("no type returned from DetectFileType?")
	}
	return dr, nil
}