SnmpScalarNodeBits.cs

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/*
 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 *
 * This file is part of the lwIP TCP/IP stack.
 *
 * Author: Martin Hentschel <info@cl-soft.de>
 *
 */

using System;
using System.Text;
using CCodeGeneration;

namespace LwipSnmpCodeGeneration
{
    public class SnmpScalarNodeBits : SnmpScalarNode
    {
        private readonly uint bitCount;

        public SnmpScalarNodeBits(SnmpTreeNode parentNode, uint bitCount)
            : base(parentNode)
        {
            this.DataType = SnmpDataType.Bits;
            this.bitCount = bitCount;
        }

        public override void GenerateGetMethodCode(CodeContainerBase container, string valueVarName, ref bool valueVarUsed, string retLenVarName)
        {
            container.AddCode(String.Format(
                "{0} = snmp_encode_bits(({1} *){2}, SNMP_MAX_VALUE_SIZE, 0 /* TODO: pass real value here */, {3});",
                retLenVarName, 
                LwipDefs.Vt_U8,
                valueVarName,
                this.bitCount));
            
            valueVarUsed = true;
        }

        public override void GenerateTestMethodCode(CodeContainerBase container, string valueVarName, ref bool valueVarUsed, string lenVarName, ref bool lenVarUsed, string retErrVarName)
        {
            if (this.Restrictions.Count > 0)
            {
                const string bitVarName = "bits";

                container.Declarations.Add(new VariableDeclaration(new VariableType(bitVarName, LwipDefs.Vt_U32)));

                IfThenElse ite = new IfThenElse(String.Format(
                    "snmp_decode_bits(({0} *){1}, {2}, &{3}) == ERR_OK",
                    LwipDefs.Vt_U8,
                    valueVarName,
                    lenVarName,
                    bitVarName));

                valueVarUsed = true;
                lenVarUsed = true;

                StringBuilder innerIfCond = new StringBuilder();
                foreach (IRestriction restriction in this.Restrictions)
                {
                    innerIfCond.Append(restriction.GetCheckCodeValid(bitVarName));
                    innerIfCond.Append(" || ");
                }

                innerIfCond.Length -= 4;

                IfThenElse innerIte = new IfThenElse(innerIfCond.ToString());
                innerIte.AddCode(String.Format("{0} = {1};", retErrVarName, LwipDefs.Def_ErrorCode_Ok));
                ite.AddElement(innerIte);
                container.AddElement(ite);
            }
            else
            {
                base.GenerateTestMethodCode(container, valueVarName, ref valueVarUsed, lenVarName, ref lenVarUsed, retErrVarName);
            }
        }

        public override void GenerateSetMethodCode(CodeContainerBase container, string valueVarName, ref bool valueVarUsed, string lenVarName, ref bool lenVarUsed, string retErrVarName)
        {
            const string bitVarName = "bits";

            container.Declarations.Add(new VariableDeclaration(new VariableType(bitVarName, LwipDefs.Vt_U32)));

            IfThenElse ite = new IfThenElse(String.Format(
                "snmp_decode_bits(({0} *){1}, {2}, &{3}) == ERR_OK",
                LwipDefs.Vt_U8,
                valueVarName,
                lenVarName,
                bitVarName));

            valueVarUsed = true;
            lenVarUsed = true;

            ite.AddElement(new Comment(String.Format("TODO: store new value contained in '{0}' here", bitVarName), singleLine: true));

            container.AddElement(ite);
        }
    }
}