filesize static method

String filesize({ dynamic size, int round = 2, })

A method returns a human readable string representing a file _size

Implementation

static String filesize({
  dynamic size,
  int round = 2,
}) {
  /**
 * [size] can be passed as number or as string
 *
 * the optional parameter [round] specifies the number
 * of digits after comma/point (default is 2)
 */
  int divider = 1024;
  int _size = int.tryParse(size.toString()) ?? 0;
  if (_size < divider) {
    return '$_size B';
  }

  if (_size < divider * divider && _size % divider == 0) {
    return '${(_size / divider).toStringAsFixed(0)} KB';
  }

  if (_size < divider * divider) {
    return '${(_size / divider).toStringAsFixed(round)} KB';
  }

  if (_size < divider * divider * divider && _size % divider == 0) {
    return '${(_size / (divider * divider)).toStringAsFixed(0)} MB';
  }

  if (_size < divider * divider * divider) {
    return '${(_size / divider / divider).toStringAsFixed(round)} MB';
  }

  if (_size < divider * divider * divider * divider && _size % divider == 0) {
    return '${(_size / (divider * divider * divider)).toStringAsFixed(0)} GB';
  }

  if (_size < divider * divider * divider * divider) {
    return '${(_size / divider / divider / divider).toStringAsFixed(round)} GB';
  }

  if (_size < divider * divider * divider * divider * divider &&
      _size % divider == 0) {
    num r = _size / divider / divider / divider / divider;
    return '${r.toStringAsFixed(0)} TB';
  }

  if (_size < divider * divider * divider * divider * divider) {
    num r = _size / divider / divider / divider / divider;
    return '${r.toStringAsFixed(round)} TB';
  }

  if (_size < divider * divider * divider * divider * divider * divider &&
      _size % divider == 0) {
    num r = _size / divider / divider / divider / divider / divider;
    return '${r.toStringAsFixed(0)} PB';
  } else {
    num r = _size / divider / divider / divider / divider / divider;
    return '${r.toStringAsFixed(round)} PB';
  }
}