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
- FileDialog.cs
- PageSetupDialog.cs
- PersonalizationStateInfoCollection.cs
- XmlDeclaration.cs
- TypeDescriptor.cs
- HealthMonitoringSectionHelper.cs
- CallbackHandler.cs
- Activity.cs
- ServiceConfigurationTraceRecord.cs
- MailAddressCollection.cs
- MgmtResManager.cs
- SiteMap.cs
- HostedHttpContext.cs
- Stylesheet.cs
- CryptoKeySecurity.cs
- AutomationPropertyInfo.cs
- AppSecurityManager.cs
- ConfigurationStrings.cs
- OdbcUtils.cs
- CompilerGlobalScopeAttribute.cs
- ISO2022Encoding.cs
- DBSchemaTable.cs
- Executor.cs
- BaseParaClient.cs
- TableLayoutSettingsTypeConverter.cs
- CachedCompositeFamily.cs
- LongValidatorAttribute.cs
- TreeViewImageKeyConverter.cs
- XmlValidatingReader.cs
- TileBrush.cs
- HorizontalAlignConverter.cs
- JavaScriptString.cs
- HatchBrush.cs
- DocobjHost.cs
- ApplicationProxyInternal.cs
- SkinBuilder.cs
- EllipseGeometry.cs
- Control.cs
- UIElement3D.cs
- CharAnimationUsingKeyFrames.cs
- XmlSchemaInfo.cs
- InvalidComObjectException.cs
- IdnElement.cs
- MappedMetaModel.cs
- PieceDirectory.cs
- NameSpaceExtractor.cs
- FontNameEditor.cs
- OdbcEnvironmentHandle.cs
- FullTextState.cs
- ScriptingProfileServiceSection.cs
- SoapDocumentMethodAttribute.cs
- METAHEADER.cs
- SQLRoleProvider.cs
- XPathChildIterator.cs
- QualifierSet.cs
- Crc32Helper.cs
- ReplacementText.cs
- SmtpException.cs
- FloaterBaseParagraph.cs
- CreateRefExpr.cs
- Completion.cs
- ButtonBase.cs
- WpfPayload.cs
- ListView.cs
- WebServiceClientProxyGenerator.cs
- Compilation.cs
- CompiledQuery.cs
- Function.cs
- ComponentRenameEvent.cs
- BindingListCollectionView.cs
- CrossAppDomainChannel.cs
- InvalidComObjectException.cs
- StylusPlugInCollection.cs
- TreeWalkHelper.cs
- ValidatorUtils.cs
- FixedSOMContainer.cs
- FormatPage.cs
- DataTable.cs
- PermissionSet.cs
- NamespaceEmitter.cs
- ProtocolReflector.cs
- WinEventQueueItem.cs
- CheckoutException.cs
- OracleSqlParser.cs
- StreamGeometry.cs
- DataGridViewCell.cs
- ClientScriptManager.cs
- ChildrenQuery.cs
- AnnotationComponentManager.cs
- UntrustedRecipientException.cs
- AbandonedMutexException.cs
- RequestCacheEntry.cs
- serverconfig.cs
- MatrixTransform3D.cs
- Menu.cs
- MD5CryptoServiceProvider.cs
- DataObjectSettingDataEventArgs.cs
- PartialCachingControl.cs
- GrammarBuilderDictation.cs
- DBSqlParserColumnCollection.cs