Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / wpf / src / Base / MS / Internal / Security / RightsManagement / SafeRightsManagementPubHandle.cs / 1 / SafeRightsManagementPubHandle.cs
//------------------------------------------------------------------------------ // //// Copyright (c) Microsoft Corporation. All rights reserved. // // // Description: // SafeRightsManagementPubHandle class // // History: // 10/12/2005: SarjanaS: Initial implementation. // //----------------------------------------------------------------------------- using System; using System.Runtime.InteropServices; using Microsoft.Win32.SafeHandles; using System.Security; namespace MS.Internal.Security.RightsManagement { [SecurityCritical(SecurityCriticalScope.Everything)] internal sealed class SafeRightsManagementPubHandle : SafeHandle { //Although it is not obvious this constructor is being called by the interop services // it throws exceptions without it private SafeRightsManagementPubHandle() : base(IntPtr.Zero, true) { } // We have incompatibility between SafeHandle class hierarchy and the unmanaged // DRM SDK declarations. In the safe handle hierarchy it is assumed that the type // of handle is the IntPtr (64 or 32 bit depending on the platform). In the unmanaged // SDK C++ unsigned long type is used, which is 32 bit regardless of the platform. // We have decided the safest thing would be to still use the SafeHandle classes // and subclasses and cast variable back and force under assumption that IntPtr // is at least as big as unsigned long (in the managed code we generally use uint // declaration for that) internal SafeRightsManagementPubHandle(uint handle) : base((IntPtr)handle, true) // "true" means "owns the handle" { } // base class expects us to override this method with the handle specific release code protected override bool ReleaseHandle() { int z = 0; if (!IsInvalid) { // we can not use safe handle in the DrmClose... function // as the SafeHandle implementation marks this instance as an invalid by the time // ReleaseHandle is called. After that marshalling code doesn't let the current instance // of the Safe*Handle sub-class to cross managed/unmanaged boundary. z = SafeNativeMethods.DRMClosePubHandle((uint)this.handle); #if DEBUG Errors.ThrowOnErrorCode(z); #endif // This member might be called twice(depending on the client app). In order to // prevent Unmanaged RM SDK from returning an error (Handle is already closed) // we need to mark our handle as invalid after successful close call base.SetHandle(IntPtr.Zero); } return (z>=0); } // apparently there is no existing implementation that treats Zero and only Zero as an invalid value // so we are sub-classing the base class and we need to override the IsInvalid property along with // ReleaseHandle implementation public override bool IsInvalid { get { return this.handle.Equals(IntPtr.Zero); } } internal static SafeRightsManagementPubHandle InvalidHandle { get { return _invalidHandle; } } private static readonly SafeRightsManagementPubHandle _invalidHandle = new SafeRightsManagementPubHandle(0); } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //------------------------------------------------------------------------------ // //// Copyright (c) Microsoft Corporation. All rights reserved. // // // Description: // SafeRightsManagementPubHandle class // // History: // 10/12/2005: SarjanaS: Initial implementation. // //----------------------------------------------------------------------------- using System; using System.Runtime.InteropServices; using Microsoft.Win32.SafeHandles; using System.Security; namespace MS.Internal.Security.RightsManagement { [SecurityCritical(SecurityCriticalScope.Everything)] internal sealed class SafeRightsManagementPubHandle : SafeHandle { //Although it is not obvious this constructor is being called by the interop services // it throws exceptions without it private SafeRightsManagementPubHandle() : base(IntPtr.Zero, true) { } // We have incompatibility between SafeHandle class hierarchy and the unmanaged // DRM SDK declarations. In the safe handle hierarchy it is assumed that the type // of handle is the IntPtr (64 or 32 bit depending on the platform). In the unmanaged // SDK C++ unsigned long type is used, which is 32 bit regardless of the platform. // We have decided the safest thing would be to still use the SafeHandle classes // and subclasses and cast variable back and force under assumption that IntPtr // is at least as big as unsigned long (in the managed code we generally use uint // declaration for that) internal SafeRightsManagementPubHandle(uint handle) : base((IntPtr)handle, true) // "true" means "owns the handle" { } // base class expects us to override this method with the handle specific release code protected override bool ReleaseHandle() { int z = 0; if (!IsInvalid) { // we can not use safe handle in the DrmClose... function // as the SafeHandle implementation marks this instance as an invalid by the time // ReleaseHandle is called. After that marshalling code doesn't let the current instance // of the Safe*Handle sub-class to cross managed/unmanaged boundary. z = SafeNativeMethods.DRMClosePubHandle((uint)this.handle); #if DEBUG Errors.ThrowOnErrorCode(z); #endif // This member might be called twice(depending on the client app). In order to // prevent Unmanaged RM SDK from returning an error (Handle is already closed) // we need to mark our handle as invalid after successful close call base.SetHandle(IntPtr.Zero); } return (z>=0); } // apparently there is no existing implementation that treats Zero and only Zero as an invalid value // so we are sub-classing the base class and we need to override the IsInvalid property along with // ReleaseHandle implementation public override bool IsInvalid { get { return this.handle.Equals(IntPtr.Zero); } } internal static SafeRightsManagementPubHandle InvalidHandle { get { return _invalidHandle; } } private static readonly SafeRightsManagementPubHandle _invalidHandle = new SafeRightsManagementPubHandle(0); } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu

This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- XmlNamedNodeMap.cs
- SerializerWriterEventHandlers.cs
- EntityViewContainer.cs
- DBParameter.cs
- BuildProvider.cs
- LinkLabelLinkClickedEvent.cs
- SystemMulticastIPAddressInformation.cs
- BaseProcessor.cs
- CollectionContainer.cs
- RNGCryptoServiceProvider.cs
- SqlDeflator.cs
- WebPartChrome.cs
- _NegotiateClient.cs
- SessionStateItemCollection.cs
- Pen.cs
- ThicknessConverter.cs
- XmlSchemas.cs
- SHA512.cs
- SoapAttributes.cs
- BitmapScalingModeValidation.cs
- ObfuscationAttribute.cs
- ApplicationActivator.cs
- StructuredCompositeActivityDesigner.cs
- FormsAuthenticationTicket.cs
- PageCatalogPart.cs
- FileDialog_Vista.cs
- StylusPointPropertyInfo.cs
- FileRecordSequence.cs
- MethodCallTranslator.cs
- ExpressionWriter.cs
- SmiMetaData.cs
- ComponentDispatcherThread.cs
- TextServicesLoader.cs
- EntityClassGenerator.cs
- StorageBasedPackageProperties.cs
- LoginCancelEventArgs.cs
- ReadOnlyDataSource.cs
- CodeVariableDeclarationStatement.cs
- TextModifier.cs
- AliasedSlot.cs
- NewExpression.cs
- TemplateInstanceAttribute.cs
- _KerberosClient.cs
- SQLBinaryStorage.cs
- AstNode.cs
- ILGenerator.cs
- AttachmentService.cs
- ValidationResult.cs
- MessagePropertyFilter.cs
- SelectedDatesCollection.cs
- ContextMenuAutomationPeer.cs
- MouseButtonEventArgs.cs
- DataSpaceManager.cs
- GridPattern.cs
- TypeUtil.cs
- TTSEngineProxy.cs
- MULTI_QI.cs
- ControlType.cs
- OleDbError.cs
- ByteStack.cs
- WaitHandle.cs
- CodeFieldReferenceExpression.cs
- MatrixValueSerializer.cs
- TreeBuilder.cs
- HttpConfigurationSystem.cs
- HighContrastHelper.cs
- ScriptingRoleServiceSection.cs
- ProviderSettingsCollection.cs
- ReadOnlyHierarchicalDataSourceView.cs
- InkCanvasSelectionAdorner.cs
- CodeSubDirectory.cs
- HttpInputStream.cs
- InitializerFacet.cs
- TogglePattern.cs
- RijndaelManaged.cs
- ChannelFactoryBase.cs
- StrongBox.cs
- MarkupCompiler.cs
- MenuAutomationPeer.cs
- ObjectSecurity.cs
- DefaultHttpHandler.cs
- CriticalExceptions.cs
- XamlTemplateSerializer.cs
- DoubleIndependentAnimationStorage.cs
- DefaultParameterValueAttribute.cs
- DataListGeneralPage.cs
- WebErrorHandler.cs
- WebPartDeleteVerb.cs
- Timer.cs
- PartialCachingAttribute.cs
- TextContainerChangeEventArgs.cs
- NegatedCellConstant.cs
- LinkedResourceCollection.cs
- EventWaitHandleSecurity.cs
- AssociationSetMetadata.cs
- TransformFinalBlockRequest.cs
- CollectionViewSource.cs
- DataGridSortCommandEventArgs.cs
- DataGridAddNewRow.cs
- BevelBitmapEffect.cs