DnDns.Query.DnsQueryRequest.BuildQuery C# (CSharp) Method

		private byte[] BuildQuery(string host) 
		{
			string newHost;
			int newLocation = 0;
			int oldLocation = 0;

			MemoryStream ms = new MemoryStream();

			host = host.Trim();
			// decide how to build this query based on type
			switch (_nsType) 
			{
				case NsType.PTR:
					IPAddress queryIP = IPAddress.Parse(host);

					// pointer should be translated as follows
					// 209.115.22.3 -> 3.22.115.209.in-addr.arpa
					char[] ipDelim = new char[] {'.'};

					string[] s = host.Split(ipDelim,4);
					newHost = String.Format("{0}.{1}.{2}.{3}.in-addr.arpa", s[3], s[2], s[1], s[0]);
					break;
				default:
					newHost = host;
					break;
			}
			
			// Package up the host
			while(oldLocation < newHost.Length) 
			{
				newLocation = newHost.IndexOf(".", oldLocation);	
				
				if (newLocation == -1) newLocation = newHost.Length;

				byte subDomainLength = (byte)(newLocation - oldLocation);
				char[] sub = newHost.Substring(oldLocation, subDomainLength).ToCharArray();
				
				ms.WriteByte(subDomainLength);
				ms.Write(Encoding.ASCII.GetBytes(sub, 0, sub.Length), 0, sub.Length);

				oldLocation = newLocation + 1;
			}

			// Terminate the domain name w/ a 0x00. 
			ms.WriteByte(0x00);

			return ms.ToArray();
		}