Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / 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
- PointValueSerializer.cs
- MenuItem.cs
- GridView.cs
- SamlSerializer.cs
- InternalResources.cs
- EncodingStreamWrapper.cs
- SHA384.cs
- DataGridCellsPanel.cs
- WindowsRichEdit.cs
- Visual3DCollection.cs
- SqlGenericUtil.cs
- DefinitionBase.cs
- QilUnary.cs
- FactoryGenerator.cs
- TextParagraphCache.cs
- SecurityUtils.cs
- TypeElement.cs
- MetafileHeaderWmf.cs
- DebugHandleTracker.cs
- serverconfig.cs
- ExceptionHelpers.cs
- AssemblyHash.cs
- SQLConvert.cs
- PointKeyFrameCollection.cs
- AssemblyCollection.cs
- PageAdapter.cs
- StringDictionary.cs
- sqlstateclientmanager.cs
- Hash.cs
- PageAsyncTaskManager.cs
- TimeSpanValidator.cs
- WebContext.cs
- PrimitiveXmlSerializers.cs
- CookieParameter.cs
- ParseNumbers.cs
- WpfXamlLoader.cs
- HttpCapabilitiesBase.cs
- BlobPersonalizationState.cs
- ZipPackage.cs
- SqlDataReader.cs
- CheckedListBox.cs
- BindingExpressionBase.cs
- XamlTreeBuilderBamlRecordWriter.cs
- NumberFormatter.cs
- DataGridViewDataConnection.cs
- CompiledQueryCacheKey.cs
- WebPartHelpVerb.cs
- embossbitmapeffect.cs
- VersionPair.cs
- PassportIdentity.cs
- RelationshipSet.cs
- StandardOleMarshalObject.cs
- SyndicationElementExtension.cs
- ArrayHelper.cs
- ViewBase.cs
- BaseHashHelper.cs
- SafeReadContext.cs
- HandoffBehavior.cs
- TextTreeRootTextBlock.cs
- WorkflowRuntimeService.cs
- MetadataCache.cs
- OutputCacheSettingsSection.cs
- ElementMarkupObject.cs
- PeerNameResolver.cs
- QueryOptionExpression.cs
- SystemIPv4InterfaceProperties.cs
- HttpCookie.cs
- UInt16Converter.cs
- CodeArrayCreateExpression.cs
- Profiler.cs
- BitSet.cs
- TreeSet.cs
- ObjectListDataBindEventArgs.cs
- AccessViolationException.cs
- SpellerStatusTable.cs
- StreamReader.cs
- LongValidator.cs
- StringAnimationBase.cs
- XmlSerializerVersionAttribute.cs
- ContractsBCL.cs
- SqlDelegatedTransaction.cs
- BulletedListDesigner.cs
- ControlPaint.cs
- Cell.cs
- PropertySegmentSerializer.cs
- UriTemplateTrieNode.cs
- HostingEnvironmentSection.cs
- FragmentQueryProcessor.cs
- LinqDataSourceDeleteEventArgs.cs
- TableProviderWrapper.cs
- CookieParameter.cs
- GridViewCommandEventArgs.cs
- ValidationHelper.cs
- XmlDataImplementation.cs
- HttpCacheVaryByContentEncodings.cs
- TrackBar.cs
- MenuItemStyle.cs
- PackagePartCollection.cs
- EventMappingSettingsCollection.cs
- DataControlPagerLinkButton.cs