Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Base / MS / Internal / Security / RightsManagement / SafeRightsManagementPubHandle.cs / 1305600 / 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
- MouseCaptureWithinProperty.cs
- ProfileParameter.cs
- DataGridViewBand.cs
- SharedMemory.cs
- SoapAttributes.cs
- StackOverflowException.cs
- RoutedUICommand.cs
- Material.cs
- BitHelper.cs
- OperatorExpressions.cs
- DoubleLink.cs
- ViewManager.cs
- WebBrowserUriTypeConverter.cs
- WorkflowEnvironment.cs
- Expressions.cs
- FixedFindEngine.cs
- SqlRemoveConstantOrderBy.cs
- MetabaseServerConfig.cs
- ToolStripPanelRow.cs
- ControlPropertyNameConverter.cs
- DataBindingList.cs
- brushes.cs
- HttpHeaderCollection.cs
- OleDbTransaction.cs
- XmlBinaryReader.cs
- TimeSpan.cs
- ItemsControlAutomationPeer.cs
- BinaryFormatter.cs
- CodeMethodMap.cs
- FormsAuthenticationTicket.cs
- GridViewItemAutomationPeer.cs
- BindingBase.cs
- SymbolTable.cs
- OperationContextScope.cs
- TrackingStringDictionary.cs
- MouseOverProperty.cs
- LinqDataSourceValidationException.cs
- QueryRewriter.cs
- XmlSchemaSubstitutionGroup.cs
- DataControlButton.cs
- TextSelection.cs
- SecureUICommand.cs
- SmiContextFactory.cs
- WebPartMenu.cs
- DefaultTraceListener.cs
- CodeSnippetTypeMember.cs
- TextBreakpoint.cs
- DataReaderContainer.cs
- DataConnectionHelper.cs
- EndPoint.cs
- KerberosSecurityTokenParameters.cs
- SoapTypeAttribute.cs
- WmpBitmapEncoder.cs
- DataError.cs
- PackageRelationship.cs
- Pts.cs
- TokenDescriptor.cs
- ParseNumbers.cs
- TreeViewDesigner.cs
- XpsFixedDocumentSequenceReaderWriter.cs
- ProfessionalColors.cs
- PropertyOverridesTypeEditor.cs
- CodeDirectiveCollection.cs
- DbProviderManifest.cs
- SchemaTableColumn.cs
- messageonlyhwndwrapper.cs
- PolygonHotSpot.cs
- DesignerDataTable.cs
- ScriptRegistrationManager.cs
- MethodBuilder.cs
- WsatExtendedInformation.cs
- CloseSequenceResponse.cs
- OledbConnectionStringbuilder.cs
- SystemPens.cs
- XmlSchemaException.cs
- CharAnimationBase.cs
- IdentifierService.cs
- ExceptionUtil.cs
- AncillaryOps.cs
- DataGridItem.cs
- DebugTracing.cs
- DeviceContext.cs
- StylusCaptureWithinProperty.cs
- SettingsPropertyIsReadOnlyException.cs
- HttpWebRequestElement.cs
- DBCommandBuilder.cs
- ResourcesChangeInfo.cs
- SafeSecurityHelper.cs
- XmlCharacterData.cs
- XmlWriterTraceListener.cs
- WeakRefEnumerator.cs
- TreeNodeCollection.cs
- SelectionChangedEventArgs.cs
- MinMaxParagraphWidth.cs
- Application.cs
- PageThemeBuildProvider.cs
- CodeSnippetTypeMember.cs
- BezierSegment.cs
- BamlStream.cs
- QueryPageSettingsEventArgs.cs