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 / SafeRightsManagementHandle.cs / 1 / SafeRightsManagementHandle.cs
//------------------------------------------------------------------------------ // //// Copyright (c) Microsoft Corporation. All rights reserved. // // // Description: // SafeRightsManagementHandle 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 SafeRightsManagementHandle : SafeHandle { //Although it is not obvious this constructor is being called by the interop services // it throws exceptions without it private SafeRightsManagementHandle() : 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 SafeRightsManagementHandle(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.DRMCloseHandle((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 SafeRightsManagementHandle InvalidHandle { get { return _invalidHandle; } } private static readonly SafeRightsManagementHandle _invalidHandle = new SafeRightsManagementHandle(0); } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //------------------------------------------------------------------------------ // //// Copyright (c) Microsoft Corporation. All rights reserved. // // // Description: // SafeRightsManagementHandle 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 SafeRightsManagementHandle : SafeHandle { //Although it is not obvious this constructor is being called by the interop services // it throws exceptions without it private SafeRightsManagementHandle() : 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 SafeRightsManagementHandle(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.DRMCloseHandle((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 SafeRightsManagementHandle InvalidHandle { get { return _invalidHandle; } } private static readonly SafeRightsManagementHandle _invalidHandle = new SafeRightsManagementHandle(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
- ServiceNameCollection.cs
- XmlNullResolver.cs
- Point3DAnimation.cs
- AnnotationMap.cs
- GridSplitterAutomationPeer.cs
- TraceHandler.cs
- ReferentialConstraint.cs
- CompositeActivityTypeDescriptor.cs
- WindowsTooltip.cs
- MSHTMLHost.cs
- SoapTypeAttribute.cs
- SmiConnection.cs
- HttpHandlerAction.cs
- TimeSpanMinutesConverter.cs
- CRYPTPROTECT_PROMPTSTRUCT.cs
- SiteMap.cs
- Component.cs
- ConnectionManagementElement.cs
- DecimalAnimation.cs
- ColorTransformHelper.cs
- DefaultWorkflowSchedulerService.cs
- WebPartZoneBase.cs
- RegexCharClass.cs
- Executor.cs
- ToolboxSnapDragDropEventArgs.cs
- TextCompositionEventArgs.cs
- WebFormsRootDesigner.cs
- WinFormsComponentEditor.cs
- ShaderRenderModeValidation.cs
- PathFigure.cs
- SystemInformation.cs
- KeysConverter.cs
- TypeToken.cs
- XMLSyntaxException.cs
- SiteMapHierarchicalDataSourceView.cs
- ResourceExpression.cs
- KeyFrames.cs
- SoapHeaders.cs
- base64Transforms.cs
- StringConverter.cs
- HtmlSelect.cs
- RsaSecurityToken.cs
- XmlDocumentSchema.cs
- XNameConverter.cs
- TagPrefixInfo.cs
- X500Name.cs
- WebPartEditorCancelVerb.cs
- DiagnosticTraceSchemas.cs
- EntityDataSourceQueryBuilder.cs
- AudioLevelUpdatedEventArgs.cs
- CreateParams.cs
- ServiceOperation.cs
- XmlDocument.cs
- TemplatedWizardStep.cs
- ObjectConverter.cs
- CatalogZoneBase.cs
- ObservableCollection.cs
- Clock.cs
- PermissionSetEnumerator.cs
- MetadataFile.cs
- Latin1Encoding.cs
- Geometry3D.cs
- Control.cs
- HeaderFilter.cs
- NamespaceQuery.cs
- PopupControlService.cs
- Vector.cs
- ButtonAutomationPeer.cs
- OdbcRowUpdatingEvent.cs
- XPathDocumentNavigator.cs
- SubpageParagraph.cs
- GlyphShapingProperties.cs
- LocalValueEnumerator.cs
- XmlDigitalSignatureProcessor.cs
- ResourcePart.cs
- BufferedMessageWriter.cs
- isolationinterop.cs
- HebrewNumber.cs
- DataQuery.cs
- PageThemeParser.cs
- PointAnimationUsingPath.cs
- UserValidatedEventArgs.cs
- CngUIPolicy.cs
- FastEncoderWindow.cs
- XmlSchemaAll.cs
- EventLogPermissionAttribute.cs
- VerificationException.cs
- ToolStripButton.cs
- StringCollection.cs
- DataBoundControlActionList.cs
- TraceSource.cs
- CompensationTokenData.cs
- AuthenticatedStream.cs
- TextBoxBase.cs
- MultiTrigger.cs
- Enumerable.cs
- TableDetailsRow.cs
- X509Certificate.cs
- UnmanagedMemoryStream.cs
- WebPartDescriptionCollection.cs