SnmpScalarNodeOctetString.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 SnmpScalarNodeOctetString : SnmpScalarNode
    {
        public SnmpScalarNodeOctetString(SnmpDataType dataType, SnmpTreeNode parentNode)
            : base(parentNode)
        {
            System.Diagnostics.Debug.Assert(
                (dataType == SnmpDataType.OctetString) || 
                 (dataType == SnmpDataType.Opaque) || 
                 (dataType == SnmpDataType.IpAddress));

            this.DataType = dataType;
        }

        protected override void GenerateGetMethodCodeCore(CodeContainerBase container, string localValueVarName, ref bool localValueVarUsed, string retLenVarName)
        {
            if (this.Restrictions.Count > 0)
            {
                StringBuilder ifCond = new StringBuilder();
                foreach (IRestriction restriction in this.Restrictions)
                {
                    ifCond.Append(restriction.GetCheckCodeValid(retLenVarName));
                    ifCond.Append(" || ");
                }

                ifCond.Length -= 4;
                container.AddElement(new Comment("TODO: take care of len restrictions defined in MIB: " + ifCond, singleLine: true));
            }
            base.GenerateGetMethodCodeCore(container, localValueVarName, ref localValueVarUsed, retLenVarName);
        }

        protected override void GenerateTestMethodCodeCore(CodeContainerBase container, string localValueVarName, ref bool localValueVarUsed, string lenVarName, ref bool lenVarUsed, string retErrVarName)
        {
            System.Diagnostics.Trace.Assert(this.Restrictions.Count > 0);

            // checks refer to length of octet string
            StringBuilder ifCond = new StringBuilder();
            foreach (IRestriction restriction in this.Restrictions)
            {
                ifCond.Append(restriction.GetCheckCodeValid(lenVarName));
                ifCond.Append(" || ");

                lenVarUsed = true;
            }

            ifCond.Length -= 4;

            IfThenElse ite = new IfThenElse(ifCond.ToString());
            ite.AddCode(String.Format("{0} = {1};", retErrVarName, LwipDefs.Def_ErrorCode_Ok));
            container.AddElement(ite);
        }

        public override int OidRepresentationLen
        {
            get
            {
                // check restrictions if we are set to one fixed length
                if ((this.Restrictions != null) && (this.Restrictions.Count > 0))
                {
                    foreach (IRestriction restriction in this.Restrictions)
                    {
                        if (restriction is IsInRangeRestriction)
                        {
                            if ((restriction as IsInRangeRestriction).RangeStart == (restriction as IsInRangeRestriction).RangeEnd)
                            {
                                return (int)(restriction as IsInRangeRestriction).RangeStart;
                            }
                        }
                        else if (restriction is IsEqualRestriction)
                        {
                            return (int)(restriction as IsEqualRestriction).Value;
                        }
                    }
                }

                return -1; // variable length
            }
        }

    }
}