class TransferUtil {
  double _transfer = 0;
  int _level = 0;
  List suffix = [
    'B',
    'KB',
    'MB',
    'GB',
    'TB',
    'PB'
  ];

  String toHumanReadable(int transfer) {
    _transfer = transfer.toDouble();
    handleTransfer();

    return '${_transfer.toStringAsFixed(2)} ${suffix[_level]}';
  }

  handleTransfer() {
    if (_transfer > 1024) {
      _transfer = _transfer / 1024;
      ++_level;
      handleTransfer();
    }
  }
}