Windows1251Codec.decode() fails with 0x00 bytes (null bytes) in input

[vitalii-vov]

The Windows1251Codec().decode(...) method throws a runtime error (_TypeError (Null check operator used on a null value) when the input contains null bytes (0x00) — even though 0x00 is a valid byte in Windows-1251 and should decode into the Unicode null character (\u0000).

Example
The following code reproduces the problem:

final input = Uint8List.fromList([
    73, 118, 97, 110, 111, 118, 32, 73, 118, 97, 110, // "Ivanov Ivan"
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
  ]);

final result = const Windows1251Codec().decode(input); // throws error
print(result);

Workaround:
Remove null characters from the string beforehand.

Uint8List safeSlice(Uint8List input) {
  final index = input.indexOf(0);
  return index == -1 ? input : input.sublist(0, index);
}

final safe = safeSlice(input);
final result = const Windows1251Codec().decode(safe);