Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / 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
- RayMeshGeometry3DHitTestResult.cs
- PinnedBufferMemoryStream.cs
- TcpTransportSecurity.cs
- CommandPlan.cs
- ImageUrlEditor.cs
- CallbackValidator.cs
- ConfigUtil.cs
- SchemaConstraints.cs
- smtppermission.cs
- OdbcTransaction.cs
- AssertFilter.cs
- AssemblyCollection.cs
- InputScopeManager.cs
- ProfilePropertySettingsCollection.cs
- ConfigurationErrorsException.cs
- RegistryPermission.cs
- SessionStateModule.cs
- SqlFlattener.cs
- ProgressChangedEventArgs.cs
- ParsedAttributeCollection.cs
- Visitors.cs
- DCSafeHandle.cs
- TemplateNameScope.cs
- ContentFileHelper.cs
- AppSettingsExpressionBuilder.cs
- _StreamFramer.cs
- ColumnWidthChangedEvent.cs
- OrderedDictionaryStateHelper.cs
- DataGridViewCellErrorTextNeededEventArgs.cs
- SynchronizationScope.cs
- DesignerActionKeyboardBehavior.cs
- File.cs
- NativeMethods.cs
- CrossAppDomainChannel.cs
- DataBindingCollection.cs
- HScrollBar.cs
- XPathMultyIterator.cs
- DynamicDocumentPaginator.cs
- InfoCardRSAPKCS1SignatureFormatter.cs
- ConsumerConnectionPointCollection.cs
- SurrogateSelector.cs
- TemplateAction.cs
- ContentElement.cs
- SettingsPropertyIsReadOnlyException.cs
- InputReportEventArgs.cs
- DetailsViewPageEventArgs.cs
- XmlSchemaObjectCollection.cs
- wgx_commands.cs
- TextEffect.cs
- UserNameSecurityTokenAuthenticator.cs
- SliderAutomationPeer.cs
- ClientEventManager.cs
- InternalBufferOverflowException.cs
- XmlNodeReader.cs
- Size.cs
- LoginCancelEventArgs.cs
- UIAgentRequest.cs
- HttpServerVarsCollection.cs
- DataStorage.cs
- HttpValueCollection.cs
- BaseValidator.cs
- SqlInternalConnectionSmi.cs
- DataGridViewRowsAddedEventArgs.cs
- Int64.cs
- ColumnResult.cs
- WebPartEditorCancelVerb.cs
- PageContentAsyncResult.cs
- RequestBringIntoViewEventArgs.cs
- DataSourceXmlSerializer.cs
- ResetableIterator.cs
- Column.cs
- TypeTypeConverter.cs
- EntityDesignerUtils.cs
- AbandonedMutexException.cs
- TemplateComponentConnector.cs
- StreamWriter.cs
- embossbitmapeffect.cs
- ClientConvert.cs
- NameValuePermission.cs
- DiagnosticsElement.cs
- PerfCounters.cs
- HtmlLinkAdapter.cs
- UserThread.cs
- TimersDescriptionAttribute.cs
- WindowsListViewGroup.cs
- TabItem.cs
- XPathDocument.cs
- DispatcherExceptionEventArgs.cs
- Policy.cs
- BufferModesCollection.cs
- SystemIPv4InterfaceProperties.cs
- MenuItemBindingCollection.cs
- AsymmetricKeyExchangeFormatter.cs
- JavaScriptSerializer.cs
- ActivitySurrogate.cs
- XmlNodeChangedEventManager.cs
- PeerTransportBindingElement.cs
- FilteredSchemaElementLookUpTable.cs
- ToolStripOverflowButton.cs
- AncestorChangedEventArgs.cs