convert method

@override List<int> convert(String hex)

Converts input and returns the result of the conversion.

Implementation

@override
List<int> convert(String hex) {
  String str = hex.replaceAll(" ", "");
  str = str.toLowerCase();
  if(str.length % 2 != 0) {
    str = "0" + str;
  }
  Uint8List result = new Uint8List(str.length ~/ 2);
  for(int i = 0 ; i < result.length ; i++) {
    int firstDigit = _ALPHABET.indexOf(str[i*2]);
    int secondDigit = _ALPHABET.indexOf(str[i*2+1]);
    if (firstDigit == -1 || secondDigit == -1) {
      throw new FormatException("Non-hex character detected in $hex");
    }
    result[i] = (firstDigit << 4) + secondDigit;
  }
  return result;
}