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//
// This file is part of the OpenLink Software Virtuoso Open-Source (VOS)
// project.
//
// Copyright (C) 1998-2024 OpenLink Software
//
// This project is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the
// Free Software Foundation; only version 2 of the License, dated June 1991.
//
// This program 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
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
//
//
//
// $Id$
//
using System;
using System.Runtime.InteropServices;
#if ODBC_CLIENT
namespace OpenLink.Data.VirtuosoOdbcClient
#elif CLIENT
namespace OpenLink.Data.VirtuosoClient
#else
namespace OpenLink.Data.Virtuoso
#endif
{
/// <summary>
/// Native heap buffer.
/// </summary>
internal sealed class MemoryHandle : IDisposable
{
int length;
IntPtr handle;
internal MemoryHandle (int length)
{
this.length = length;
this.handle = IntPtr.Zero;
}
~MemoryHandle ()
{
Dispose (false);
}
public void Dispose ()
{
Dispose (true);
GC.SuppressFinalize (this);
}
private void Dispose (bool disposing)
{
if (handle != IntPtr.Zero)
{
Platform.MarshalFree (handle);
handle = IntPtr.Zero;
}
GC.KeepAlive (this);
}
internal void Reserve (int length)
{
if (handle != IntPtr.Zero)
handle = Platform.MarshalReAlloc (handle, length);
this.length = length;
GC.KeepAlive (this);
}
internal int Length
{
get { return length; }
}
internal IntPtr Handle
{
get
{
if (handle == IntPtr.Zero)
handle = Platform.MarshalAlloc (length);
return handle;
}
}
internal IntPtr GetAddress (int offset)
{
return (System.IntPtr.Size == 8)
? (IntPtr) ((System.Int64) Handle + offset)
: (IntPtr) ((System.Int32) Handle + offset);
}
}
}
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