root/trunk/AprSharp/dev/src/AprMemNode.cs

//
// Softec
//
// Contact: 
//
// Designed by Denis Gervalle and Olivier Desaive
// Written by Denis Gervalle
//
// Copyright 2004 by SOFTEC. All rights reserved.
//
using System;
using System.Diagnostics;
using System.Runtime.InteropServices;

namespace Softec.AprSharp
{
    public unsafe struct AprMemNode
    {
        private apr_memnode_t *mMemNode;

        [StructLayout( LayoutKind.Sequential )]
        private struct apr_memnode_t
        {
            public apr_memnode_t *next;
            public apr_memnode_t **selfref;
            public UInt32 index;
            public UInt32 free_index;
            public byte *first_avail;
            public byte *endp;
        }

        #region Generic embedding functions of an IntPtr
        private AprMemNode(apr_memnode_t *ptr)
        {
            mMemNode = ptr;
        }

        public AprMemNode(IntPtr ptr)
        {
            mMemNode = ptr.ToPointer();
        }
        
        public bool IsNull()
        {
            return( mMemNode == null );
        }

        private void CheckPtr()
        {
            if( mMemNode == null )
                throw new AprNullReferenceException(); 
        }

        public void ClearPtr()
        {
            mMemNode = null;
        }

        public static implicit operator IntPtr(AprMemNode memNode)
        {
            return new IntPtr(memNode.mMemNode);
        }
        
        public static implicit operator AprMemNode(IntPtr ptr)
        {
            return new AprMemNode(ptr);
        }
        
        public override string ToString()
        {
            return("[apr_memnode_t:"+(new IntPtr(mMemNode)).ToInt32().ToString("X")+"]");
        }
        #endregion
        
        #region Structure members wrapper (Properties)
         
        public AprMemNode Next
        {
            get
            {
                CheckPtr();
                return(new AprMemNode(mMemNode->next));
            }
            set
            {
                CheckPtr();
                mMemNode->next=value.mMemNode; 
            }
        }

        public AprMemNode Ref
        {
            get
            {
                CheckPtr();
                return((mMemNode->selfref != null) 
                        ? new AprMemNode(*(mMemNode->selfref))
                        : new AprMemNode(null));
            }
        }

        public IntPtr NativeRef
        {
            get
            {
                CheckPtr();
                return((IntPtr)mMemNode->selfref);
            }
            set
            {
                CheckPtr();
                mMemNode->selfref=value.ToPointer(); 
            }
        }

        public int Index
        {
            get
            {
                CheckPtr();
                return(unchecked((int)NativeIndex));
            }
        }

            [CLSCompliant(false)]
        public uint NativeIndex
        {
            get
            {
                CheckPtr();
                return(mMemNode->index);
            }
        }

        public int FreeIndex
        {
            get
            {
                CheckPtr();
                return(unchecked((int)NativeFreeIndex));
            }
        }

            [CLSCompliant(false)]
        public uint NativeFreeIndex
        {
            get
            {
                CheckPtr();
                return(mMemNode->free_index);
            }
        }
        
        public IntPtr FirstAvail
        {
            get
            {
                CheckPtr();
                return((IntPtr)mMemNode->first_avail);
            }
            set
            {
                CheckPtr();
                mMemNode->first_avail=value.ToPointer();
            }
        }

            [CLSCompliant(false)]
        public byte *NativeFirstAvail
        {
            get
            {
                CheckPtr();
                return(mMemNode->first_avail);
            }
            set
            {
                CheckPtr();
                mMemNode->first_avail=value;
            }
        }

        public IntPtr EndP
        {
            get
            {
                CheckPtr();
                return((IntPtr)mMemNode->endp);
            }
        }

            [CLSCompliant(false)]
        public byte *NativeEndP
        {
            get
            {
                CheckPtr();
                return(mMemNode->endp);
            }
        }
        #endregion
    }
}