feed method

Implementation

List<Uint8List> feed(Uint8List chunk) {
  final out = <Uint8List>[];

  for (var i = 0; i < chunk.length; i++) {
    final b = chunk[i];

    if (!_inMessage) {
      if (b == stx) {
        _inMessage = true;
        _inEscape = false;
        _payload.clear();
      }
      // else: ignore until STX
      continue;
    }

    // in message
    if (_inEscape) {
      _payload.add(b);
      _inEscape = false;
      continue;
    }

    if (b == dle) {
      _inEscape = true;
      continue;
    }

    if (b == etx) {
      // Optionally include a single trailing control byte (e.g., LRC)
      if (includeTrailingControl && i + 1 < chunk.length) {
        final next = chunk[i + 1];
        if (next < 0x20) {
          _payload.add(next);
          i++; // consume it
        }
      }

      out.add(Uint8List.fromList(_payload));
      _payload.clear();
      _inMessage = false;
      _inEscape = false;
      continue;
    }

    _payload.add(b);
  }

  return out;
}