DecoderInstruction.parse constructor

DecoderInstruction.parse(Uint8List bytes)

Parse a decoder instruction from bytes.

Reads the first byte to determine the instruction type, then decodes the remaining QPACK integer.

Implementation

factory DecoderInstruction.parse(Uint8List bytes) {
  if (bytes.isEmpty) {
    throw ArgumentError('Empty byte buffer');
  }

  final firstByte = bytes[0];

  // Section Acknowledgment: T = 1, 7-bit prefix
  if ((firstByte & 0x80) != 0) {
    final (streamId, _) = QpackInteger.decode(bytes, 0, 7);
    return SectionAcknowledgment(streamId: streamId);
  }

  // Stream Cancellation: T = 01, 6-bit prefix
  if ((firstByte & 0x40) != 0) {
    final (streamId, _) = QpackInteger.decode(bytes, 0, 6);
    return StreamCancellation(streamId: streamId);
  }

  // Insert Count Increment: T = 00, 6-bit prefix
  final (increment, _) = QpackInteger.decode(bytes, 0, 6);
  return InsertCountIncrement(increment: increment);
}