Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Base / MS / Internal / Security / RightsManagement / SafeRightsManagementHandle.cs / 1305600 / 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
- HostedImpersonationContext.cs
- Menu.cs
- PauseStoryboard.cs
- ListDictionaryInternal.cs
- DataGridViewCellPaintingEventArgs.cs
- RangeEnumerable.cs
- StyleBamlTreeBuilder.cs
- LiteralControl.cs
- DBDataPermissionAttribute.cs
- ErrorFormatter.cs
- GeneralTransformGroup.cs
- ViewSimplifier.cs
- RadioButtonList.cs
- XmlNodeList.cs
- DBConcurrencyException.cs
- FormatSettings.cs
- Expressions.cs
- _SecureChannel.cs
- StringFunctions.cs
- AssertFilter.cs
- MemoryMappedFileSecurity.cs
- BitmapScalingModeValidation.cs
- NamespaceMapping.cs
- basemetadatamappingvisitor.cs
- XmlCharType.cs
- UniqueIdentifierService.cs
- Button.cs
- Light.cs
- ItemChangedEventArgs.cs
- XmlLangPropertyAttribute.cs
- TextDecorationCollection.cs
- KeyValueConfigurationCollection.cs
- ListBoxChrome.cs
- DoubleKeyFrameCollection.cs
- Function.cs
- _CookieModule.cs
- CacheForPrimitiveTypes.cs
- ProcessProtocolHandler.cs
- DataControlCommands.cs
- CompensateDesigner.cs
- CDSsyncETWBCLProvider.cs
- ConfigurationElement.cs
- PreviewKeyDownEventArgs.cs
- MsmqIntegrationChannelFactory.cs
- XsdSchemaFileEditor.cs
- VisualTransition.cs
- GridViewUpdatedEventArgs.cs
- PresentationAppDomainManager.cs
- XamlDesignerSerializationManager.cs
- BaseTemplateParser.cs
- TextSelectionProcessor.cs
- SqlTrackingService.cs
- InstallerTypeAttribute.cs
- CodeConstructor.cs
- TextBounds.cs
- DiagnosticsElement.cs
- SQLMoneyStorage.cs
- RequestTimeoutManager.cs
- shaperfactoryquerycachekey.cs
- TabItemAutomationPeer.cs
- BindingExpressionUncommonField.cs
- BaseValidator.cs
- sqlser.cs
- SoapFormatExtensions.cs
- HostingEnvironment.cs
- BuildProvider.cs
- documentsequencetextview.cs
- TextBoxRenderer.cs
- SamlAdvice.cs
- CaseInsensitiveHashCodeProvider.cs
- ColumnResizeAdorner.cs
- AutomationPattern.cs
- ObjectStateManager.cs
- BamlLocalizableResource.cs
- Flattener.cs
- TextServicesDisplayAttribute.cs
- ListControlConvertEventArgs.cs
- BinaryMessageFormatter.cs
- RightsManagementEncryptedStream.cs
- odbcmetadatacollectionnames.cs
- StreamUpgradeProvider.cs
- CompatibleComparer.cs
- CaseInsensitiveComparer.cs
- FunctionQuery.cs
- TextRangeEdit.cs
- ToolStripItemImageRenderEventArgs.cs
- OnOperation.cs
- SapiAttributeParser.cs
- BuiltInExpr.cs
- ToolStripItemImageRenderEventArgs.cs
- DataAdapter.cs
- LineSegment.cs
- CodeDirectionExpression.cs
- Form.cs
- MulticastDelegate.cs
- BeginEvent.cs
- TreeViewImageIndexConverter.cs
- ScopedKnownTypes.cs
- ReturnType.cs
- FacetEnabledSchemaElement.cs