gistfile1.txt

String formatFileSize(int b) {
  const List<String> suffix = const [
    'B',
    'KB',
    'MB',
    'GB',
    'TB',
    'PB',
  ];
  num v = b.toDouble();
  int c = 0;
  while (v > 1024) {
    v = v / 1024;
    c += 1;
  }
  return "${prettyFormat(v)} ${suffix[c]}";
}