Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / wpf / src / Base / MS / Internal / Security / RightsManagement / SafeRightsManagementEnvironmentHandle.cs / 1 / SafeRightsManagementEnvironmentHandle.cs
//------------------------------------------------------------------------------ // //// Copyright (c) Microsoft Corporation. All rights reserved. // // // Description: // SafeRightsManagementEnvironmentHandle 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 SafeRightsManagementEnvironmentHandle : SafeHandle { //Although it is not obvious this constructor is being called by the interop services // it throws exceptions without it private SafeRightsManagementEnvironmentHandle() : 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 SafeRightsManagementEnvironmentHandle(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.DRMCloseEnvironmentHandle((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); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //------------------------------------------------------------------------------ // //// Copyright (c) Microsoft Corporation. All rights reserved. // // // Description: // SafeRightsManagementEnvironmentHandle 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 SafeRightsManagementEnvironmentHandle : SafeHandle { //Although it is not obvious this constructor is being called by the interop services // it throws exceptions without it private SafeRightsManagementEnvironmentHandle() : 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 SafeRightsManagementEnvironmentHandle(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.DRMCloseEnvironmentHandle((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); } } } } // 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
- FtpRequestCacheValidator.cs
- Italic.cs
- CodeCommentStatementCollection.cs
- ScriptMethodAttribute.cs
- FormParameter.cs
- ProtocolsSection.cs
- IndentedWriter.cs
- HttpStaticObjectsCollectionBase.cs
- ActivityStateRecord.cs
- FormatException.cs
- XamlTypeMapperSchemaContext.cs
- AuthenticationService.cs
- CodeTypeDelegate.cs
- XPathChildIterator.cs
- SequentialOutput.cs
- MeasurementDCInfo.cs
- BridgeDataRecord.cs
- EventBuilder.cs
- StyleSelector.cs
- DataColumnCollection.cs
- AccessDataSourceView.cs
- OperatorExpressions.cs
- DataSourceCacheDurationConverter.cs
- ThicknessConverter.cs
- ConfigXmlSignificantWhitespace.cs
- WhitespaceSignificantCollectionAttribute.cs
- BinaryQueryOperator.cs
- WindowsPrincipal.cs
- TextTreeTextNode.cs
- ButtonAutomationPeer.cs
- BooleanToVisibilityConverter.cs
- LiteralDesigner.cs
- PageThemeParser.cs
- GenericUriParser.cs
- BaseTreeIterator.cs
- TextTreeRootTextBlock.cs
- CacheHelper.cs
- CounterCreationDataCollection.cs
- WebRequestModuleElementCollection.cs
- CodeNamespaceImport.cs
- AtlasWeb.Designer.cs
- AppDomainUnloadedException.cs
- FrameworkReadOnlyPropertyMetadata.cs
- FormatControl.cs
- StyleHelper.cs
- DecoderFallback.cs
- AnnotationResource.cs
- LoopExpression.cs
- TextBox.cs
- FixedPosition.cs
- PartDesigner.cs
- SingleAnimation.cs
- BoundColumn.cs
- DataGridViewCheckBoxColumn.cs
- HtmlObjectListAdapter.cs
- LocalizeDesigner.cs
- NamespaceEmitter.cs
- PrivacyNoticeElement.cs
- ThreadStateException.cs
- ListCollectionView.cs
- DataSourceXmlTextReader.cs
- VBCodeProvider.cs
- sqlpipe.cs
- SafeWaitHandle.cs
- PathGeometry.cs
- DesignSurfaceCollection.cs
- DocumentGrid.cs
- StrokeNodeEnumerator.cs
- InvokeWebService.cs
- SecurityPermission.cs
- KeyValuePair.cs
- ImageAutomationPeer.cs
- IndicCharClassifier.cs
- TimeSpanOrInfiniteValidator.cs
- FrameworkContentElement.cs
- TextTreeTextNode.cs
- ExtenderControl.cs
- WSSecurityJan2004.cs
- SystemNetHelpers.cs
- GeneratedView.cs
- ItemsPanelTemplate.cs
- HashStream.cs
- listitem.cs
- StreamGeometryContext.cs
- ContextStack.cs
- XsdDateTime.cs
- DynamicPropertyReader.cs
- Int16AnimationBase.cs
- XmlConvert.cs
- XmlCharCheckingReader.cs
- MissingSatelliteAssemblyException.cs
- RouteItem.cs
- FontWeight.cs
- HeaderedContentControl.cs
- GroupItem.cs
- DataGridCommandEventArgs.cs
- RectangleF.cs
- oledbmetadatacolumnnames.cs
- ApplicationTrust.cs
- SettingsPropertyValueCollection.cs