X13.Periphery.MsDevice.GetTopicInfo C# (CSharp) Method

    private TopicInfo GetTopicInfo(Topic tp, bool sendRegister=true) {
      if(tp==null) {
        return null;
      }
      TopicInfo rez=null;
      for(int i=_topics.Count-1; i>=0; i--) {
        if(_topics[i].path==tp.path) {
          rez=_topics[i];
          break;
        }
      }
      string tpc=(tp.path.StartsWith(Owner.path))?tp.path.Remove(0, Owner.path.Length+1):tp.path;
      if(rez==null) {
        rez=new TopicInfo();
        rez.topic=tp;
        rez.path=tp.path;
        ushort rtId;
        if(PredefinedTopics.TryGetValue(tpc, out rtId)) {
          rez.TopicId=rtId;
          rez.it=TopicIdType.PreDefined;
          rez.registred=true;
        } else {
          Topic tmp=tp.parent;
          bool ignory=false;
          while(tmp!=null && tmp.valueType!=typeof(MsDevice)) {
            if(tmp.valueType==typeof(SmartTwi) || tmp.valueType==typeof(TWIDriver)) {
              ignory=true;
              break;
            }
            tmp=tmp.parent;
          }
          if(ignory) {
            rez.TopicId=0xFFFF;
            rez.it=TopicIdType.PreDefined;
            rez.registred=true;
          } else {
            rez.TopicId=CalculateTopicId(rez.path);
            rez.it=TopicIdType.Normal;
          }
        }
        _topics.Add(rez);
      }
      if(!rez.registred) {
        if(sendRegister) {
          Send(new MsRegister(rez.TopicId, tpc));
        } else {
          rez.registred=true;
        }
      }
      return rez;
    }
    private ushort CalculateTopicId(string path) {