switch compType {
	case noneType:
		r = scannedReader
	case gzipType:
		gzr, err := gzip.NewReader(scannedReader)
		if err != nil {
			if errors.Is(err, gzip.ErrHeader) || errors.Is(err, gzip.ErrChecksum) {
				return nil, errInvalidCompression(err, compType)
			}
			return nil, errTruncatedInput(err)
		}
		r = gzr
		pr.closer = gzr
	case bzip2Type: