Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / Media / Imaging / UnknownBitmapDecoder.cs / 1305600 / UnknownBitmapDecoder.cs
//------------------------------------------------------------------------------ // Microsoft Avalon // Copyright (c) Microsoft Corporation, All Rights Reserved // // File: UnknownBitmapDecoder.cs // //----------------------------------------------------------------------------- using System; using System.IO; using System.Collections; using System.Security; using System.Security.Permissions; using System.ComponentModel; using System.ComponentModel.Design.Serialization; using System.Reflection; using Microsoft.Win32.SafeHandles; using MS.Internal; using System.Diagnostics; using System.Windows.Media; using System.Globalization; using System.Runtime.InteropServices; namespace System.Windows.Media.Imaging { #region UnknownBitmapDecoder ////// The built-in Microsoft Unknown (Bitmap) Decoder. /// internal sealed class UnknownBitmapDecoder : BitmapDecoder { ////// This class is to allow us to call CoInitialize when the UnknownBitmapDecoder /// is created, so that the unmanaged dll does not get unload until we are. /// private class CoInitSafeHandle : SafeMILHandle { ////// Critical - accesses critical code. /// TreatAsSafe - No inputs, does not touch any critical data with external input. /// [SecurityCritical, SecurityTreatAsSafe] public CoInitSafeHandle() { MS.Win32.PresentationCore.UnsafeNativeMethods.WICCodec.CoInitialize(IntPtr.Zero); } ////// Critical - accesses critical code. /// TreatAsSafe - No inputs, does not touch any critical data with external input. /// [SecurityCritical, SecurityTreatAsSafe] protected override bool ReleaseHandle() { MS.Win32.PresentationCore.UnsafeNativeMethods.WICCodec.CoUninitialize(); return true; } } ////// Don't allow construction of a decoder with no params /// private UnknownBitmapDecoder() { } ////// Internal Constructor /// ////// Critical: Uses a SafeFileHandle, which is a SecurityCritical type (in v4). /// Calls SecurityCritical base class constructor. /// [SecurityCritical] internal UnknownBitmapDecoder( SafeMILHandle decoderHandle, BitmapDecoder decoder, Uri baseUri, Uri uri, Stream stream, BitmapCreateOptions createOptions, BitmapCacheOption cacheOption, bool insertInDecoderCache, bool originalWritable, Stream uriStream, UnmanagedMemoryStream unmanagedMemoryStream, SafeFileHandle safeFilehandle ) : base(decoderHandle, decoder, baseUri, uri, stream, createOptions, cacheOption, insertInDecoderCache, originalWritable, uriStream, unmanagedMemoryStream, safeFilehandle) { } #region Internal Abstract /// Need to implement this to derive from the "sealed" object internal override void SealObject() { throw new NotImplementedException(); } #endregion ////// Store a safe handle to take care of calling CoInitialize /// and CoUninitialize for us when the object is created/disposed. /// private CoInitSafeHandle _safeHandle = new CoInitSafeHandle(); } #endregion } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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