@Override
protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
in.markReaderIndex();
if (!Utils.checkHeaderAvailability(in)) {
in.resetReaderIndex();
return;
}
in.resetReaderIndex();
byte messageType = Utils.readMessageType(in);
DemuxDecoder decoder = m_decoderMap.get(messageType);
if (decoder == null) {
throw new CorruptedFrameException(
"Can't find any suitable decoder for message type: " + messageType);
}
decoder.decode(ctx, in, out);
}
private void initHeaderQos(ByteBuf buff, int messageID, AbstractMessage.QOSType... qoss)
throws IllegalAccessException {
buff.clear()
.writeByte(AbstractMessage.SUBACK << 4)
.writeBytes(Utils.encodeRemainingLength(2 + qoss.length));
buff.writeShort(messageID);
for (AbstractMessage.QOSType qos : qoss) {
buff.writeByte(qos.ordinal());
}
}
static boolean checkHeaderAvailability(ByteBuf in) {
if (in.readableBytes() < 1) {
return false;
}
// byte h1 = in.get();
// byte messageType = (byte) ((h1 & 0x00F0) >> 4);
in.skipBytes(1); // skip the messageType byte
int remainingLength = Utils.decodeRemainingLenght(in);
if (remainingLength == -1) {
return false;
}
// check remaining length
if (in.readableBytes() < remainingLength) {
return false;
}
// return messageType == type ? MessageDecoderResult.OK : MessageDecoderResult.NOT_OK;
return true;
}