System.Data.SqlClient.TdsParser.WriteTokenLength C# (CSharp) Method

        private void WriteTokenLength(byte token, int length, TdsParserStateObject stateObj)
        {
            int tokenLength = 0;

            Debug.Assert(token != 0, "0 length token!");

            // For Plp fields, this should only be used when writing to metadata header.
            // For actual data length, WriteDataLength should be used.
            // For Xml fields, there is no token length field. For MAX fields it is 0xffff.
            {
                if (TdsEnums.SQLUDT == token)
                {
                    tokenLength = 8;
                }
                else if (token == TdsEnums.SQLXMLTYPE)
                {
                    tokenLength = 8;
                }
            }

            if (tokenLength == 0)
            {
                switch (token & TdsEnums.SQLLenMask)
                {
                    case TdsEnums.SQLFixedLen:
                        Debug.Assert(length == 0x01 << ((token & 0x0c) >> 2), "length does not match encoded length in token");
                        tokenLength = 0;
                        break;

                    case TdsEnums.SQLZeroLen:
                        tokenLength = 0;
                        break;

                    case TdsEnums.SQLVarLen:
                    case TdsEnums.SQLVarCnt:
                        if (0 != (token & 0x80))
                            tokenLength = 2;
                        else if (0 == (token & 0x0c))
                            tokenLength = 4;
                        else
                            tokenLength = 1;

                        break;

                    default:
                        Debug.Assert(false, "Unknown token length!");
                        break;
                }

                switch (tokenLength)
                {
                    case 1:
                        stateObj.WriteByte((byte)length);
                        break;

                    case 2:
                        WriteShort(length, stateObj);
                        break;

                    case 4:
                        WriteInt(length, stateObj);
                        break;

                    case 8:
                        // In the metadata case we write 0xffff for partial length prefixed types.
                        //  For actual data length preceding data, WriteDataLength should be used.
                        WriteShort(TdsEnums.SQL_USHORTVARMAXLEN, stateObj);
                        break;
                } // end switch
            }
        }