//------------------------------------------------------------------------------
//  Microsoft Avalon
//  Copyright (c) Microsoft Corporation, All Rights Reserved.
//
//  File:     SafeMediaHandle.cs
//
//------------------------------------------------------------------------------
 
using System;
using System.IO;
using System.Security;
using System.Security.Permissions;
using System.Collections;
using System.Reflection;
using MS.Internal;
using MS.Win32;
using System.Diagnostics;
using System.Windows.Media;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;
using Microsoft.Win32.SafeHandles;
 
using UnsafeNativeMethods=MS.Win32.PresentationCore.UnsafeNativeMethods;
 
namespace System.Windows.Media
{
    internal class SafeMediaHandle : SafeMILHandle
    {
        /// <summary>
        /// </summary>
        internal SafeMediaHandle()
        {
        }
 
        /// <summary>
        /// </summary>
        ///<SecurityNote>
        ///     Critical: calls SafeHandle.SetHandle which LinkDemands
        ///               also takes arbitrary IntPtr as a handle
        ///</SecurityNote> 
        [SecurityCritical]
        internal SafeMediaHandle(IntPtr handle)
        {
            SetHandle(handle);
        }
 
        /// <SecurityNote>
        /// Critical - calls unmanaged code, not treat as safe because you must
        ///            validate that handle is a valid COM object.
        /// </SecurityNote>
        [SecurityCritical]
        protected override bool ReleaseHandle()
        {
            HRESULT.Check(MILMedia.Shutdown(handle));
            UnsafeNativeMethods.MILUnknown.ReleaseInterface(ref handle);
 
            return true;
        }
    }
}