115 lines
2.5 KiB
C#
115 lines
2.5 KiB
C#
//
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// NativeBuffer.cs: class for handling native pointers.
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//
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// Authors:
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// Brian Ritchie (brianlritchie@hotmail.com)
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// Sureshkumar T <tsureshkumar@novell.com> 2004.
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//
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// Copyright (C) Brian Ritchie, 2002
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//
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//
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// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.Text;
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using System.Data;
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using System.Data.Common;
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using System.Runtime.InteropServices;
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namespace System.Data.Odbc
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{
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sealed class NativeBuffer : IDisposable
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{
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private IntPtr _ptr;
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private int _length;
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private bool disposed;
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public NativeBuffer ()
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{
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}
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public IntPtr Handle
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{
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get { return _ptr; }
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set { _ptr = value; }
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}
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public int Size
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{
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get { return _length; }
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}
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public void AllocBuffer (int length)
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{
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FreeBuffer ();
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_ptr = Marshal.AllocCoTaskMem (length);
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_length = length;
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}
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public void FreeBuffer ()
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{
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if (_ptr == IntPtr.Zero)
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return;
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Marshal.FreeCoTaskMem (_ptr);
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_length = 0;
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_ptr = IntPtr.Zero;
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}
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public void EnsureAlloc (int length)
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{
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if (Size == length && _ptr != IntPtr.Zero)
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return;
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AllocBuffer (length);
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}
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public void Dispose (bool disposing)
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{
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if (disposed)
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return;
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FreeBuffer ();
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_ptr = IntPtr.Zero;
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disposed = true;
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}
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public void Dispose ()
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{
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Dispose (true);
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GC.SuppressFinalize (this);
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}
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~NativeBuffer ()
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{
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Dispose (false);
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}
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public static implicit operator IntPtr (NativeBuffer buf)
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{
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return buf.Handle;
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}
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}
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}
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