convert method

@override Uint8List convert(String input, [ int start = 0, int? end ])

Converts input and returns the result of the conversion.

Implementation

@override
Uint8List convert(String input, [int start = 0, int? end]) {
  var runes = input.runes.toList(growable: false);
  end = RangeError.checkValidRange(start, end, runes.length);

  if (end - start == 0) {
    return Uint8List(0);
  }

  var bytes = Uint8List(end - start);

  for (var i = start; i < end; i++) {
    if (dictionary[runes[i]] case int value?) {
      bytes[i] = value;
    } else {
      if (allowInvalid) {
        bytes[i] = 0x3F;
      } else {
        throw ArgumentError.value(
            input, 'input', 'Contains invalid characters.');
      }
    }
  }

  return bytes;
}