hexToBytes function
Convert a hex string to a ByteBuffer of bytes.
Implementation
ByteBuffer? hexToBytes(String? input) {
if (input == null) {
return null;
}
final s = input.replaceAll(' ', '').replaceAll(':', '').replaceAll('\n', '');
if (s.length % 2 != 0) {
throw ArgumentError.value(input);
}
final result = Uint8List(s.length ~/ 2);
for (var i = 0; i < s.length; i += 2) {
var value = int.tryParse(s.substring(i, i + 2), radix: 16);
if (value == null) {
throw ArgumentError.value(input, 'input');
}
result[i ~/ 2] = value;
}
return Uint8List.fromList(result).buffer;
}