fCraft.Player.NegotiateProtocolExtension C# (CSharp) Method

        bool NegotiateProtocolExtension()
        {
            this.reader = new PacketReader( this.stream );
            // write our ExtInfo and ExtEntry packets
            writer.Write( Packet.MakeExtInfo( 2 ).Data );
            writer.Write( Packet.MakeExtEntry( CustomBlocksExtName, CustomBlocksExtVersion ).Data );
            writer.Write( Packet.MakeExtEntry( BlockPermissionsExtName, BlockPermissionsExtVersion ).Data );

            Logger.Log( LogType.SystemActivity, "Sent ExtInfo and entry packets" );

            // Expect ExtInfo reply from the client
            OpCode extInfoReply = ( OpCode )reader.ReadByte();
            Logger.Log( LogType.SystemActivity, "Expected: {0} / Received: {1}", OpCode.ExtInfo, extInfoReply );
            if ( extInfoReply != OpCode.ExtInfo ) {
                Logger.Log( LogType.Warning, "Player {0} from {1}: Unexpected ExtInfo reply ({2})", Name, IP, extInfoReply );
                return false;
            }
            //read EXT_INFO
            ClientName = reader.ReadString();
            int expectedEntries = reader.ReadInt16();

            // wait for client to send its ExtEntries
            bool sendCustomBlockPacket = false;
            List<string> clientExts = new List<string>();
            for ( int i = 0; i < expectedEntries; i++ ) {
                // Expect ExtEntry replies (0 or more)
                OpCode extEntryReply = ( OpCode )reader.ReadByte();
                Logger.Log( LogType.SystemActivity, "Expected: {0} / Received: {1}", OpCode.ExtEntry, extEntryReply );
                if ( extEntryReply != OpCode.ExtEntry ) {
                    Logger.Log( LogType.Warning, "Player {0} from {1}: Unexpected ExtEntry reply ({2})", Name, IP, extEntryReply );
                    return false;
                }
                string extName = reader.ReadString();
                int extVersion = reader.ReadInt32();
                if ( extName == CustomBlocksExtName && extVersion == CustomBlocksExtVersion ) {
                    // Hooray, client supports custom blocks! We still need to check support level.
                    sendCustomBlockPacket = true;
                    clientExts.Add( extName + " " + extVersion );
                } else if ( extName == BlockPermissionsExtName && extVersion == BlockPermissionsExtVersion ) {
                    SupportsBlockPermissions = true;
                    clientExts.Add( extName + " " + extVersion );
                } else if ( extName == SelectionBoxExtName && extVersion == SelectionBoxExtVersion ) {
                    SelectionBoxExt = true;
                }
            }

            // log client's capabilities
            if ( clientExts.Count > 0 ) {
                Logger.Log( LogType.SystemActivity, "Player {0} is using \"{1}\", supporting: {2}",
                            Name,
                            ClientName,
                            clientExts.JoinToString( ", " ) );
            }

            if ( sendCustomBlockPacket ) {
                // if client also supports CustomBlockSupportLevel, figure out what level to use

                // Send CustomBlockSupportLevel
                writer.Write( Packet.MakeCustomBlockSupportLevel( CustomBlocksLevel ).Data );

                // Expect CustomBlockSupportLevel reply
                OpCode customBlockSupportLevelReply = ( OpCode )reader.ReadByte();
                Logger.Log( LogType.SystemActivity, "Expected: {0} / Received: {1}", OpCode.CustomBlocks, customBlockSupportLevelReply );
                if ( customBlockSupportLevelReply != OpCode.CustomBlocks ) {
                    Logger.Log( LogType.Warning, "Player {0} from {1}: Unexpected CustomBlockSupportLevel reply ({2})",
                                       Name,
                                       IP,
                                       customBlockSupportLevelReply );
                    return false;
                }
                byte clientLevel = reader.ReadByte();
                UsesCustomBlocks = ( clientLevel >= CustomBlocksLevel );
            }
            this.reader = new BinaryReader( this.stream );
            return true;
        }