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

//  AprSharp, a wrapper library around the Apache Portable Runtime Library
#region Copyright (C) 2004 SOFTEC sa.
//
//  This library is free software; you can redistribute it and/or
//  modify it under the terms of the GNU Lesser General Public
//  License as published by the Free Software Foundation; either
//  version 2.1 of the License, or (at your option) any later version.
//
//  This library is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
//  Lesser General Public License for more details.
//
//  You should have received a copy of the GNU Lesser General Public
//  License along with this library; if not, write to the Free Software
//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
//  Sources, support options and lastest version of the complete library
//  is available from:
//              http://www.softec.st/AprSharp
//              
//
//  Initial authors : 
//              Denis Gervalle
//              Olivier Desaive
#endregion
//
using System;
using System.Diagnostics;
using System.Runtime.InteropServices;

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

        [StructLayout( LayoutKind.Sequential, Pack=4 )]
        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 = (apr_memnode_t *)ptr.ToPointer();
        }
        
        public bool IsNull
        {
                get
                {
                return( mMemNode == null );
            }
        }

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

        public void ClearPtr()
        {
            mMemNode = null;
        }

        public IntPtr ToIntPtr()
        {
            return new IntPtr(mMemNode);
        }

                public bool ReferenceEquals(IAprUnmanaged obj)
                {
                        return(obj.ToIntPtr() == ToIntPtr());
                }
                
        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=(apr_memnode_t **)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=(byte *)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
    }
}