in lib/src/codepage.dart [344:360]
String convert(List<int> bytes, {bool allowInvalid = false}) {
if (allowInvalid) return _convertAllowInvalid(bytes);
var count = bytes.length;
var codeUnits = Uint16List(count);
for (var i = 0; i < count; i++) {
var byte = bytes[i];
if (byte != byte & 0xff) {
throw FormatException("Not a byte value", bytes, i);
}
var character = _characters.codeUnitAt(byte);
if (character == 0xFFFD) {
throw FormatException("Not defined in this code page", bytes, i);
}
codeUnits[i] = character;
}
return String.fromCharCodes(codeUnits);
}