Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Base / MS / Internal / Security / RightsManagement / CallbackHandler.cs / 1305600 / CallbackHandler.cs
//------------------------------------------------------------------------------ // //// Copyright (c) Microsoft Corporation. All rights reserved. // // // Description: // These are the internal helpers that used to process callbacks from RM SDK // // History: // 06/13/2005: IgorBel: Initial implementation. // //----------------------------------------------------------------------------- using System; using System.Threading; using System.Runtime.InteropServices; using System.Security; // Enable presharp pragma warning suppress directives. #pragma warning disable 1634, 1691 namespace MS.Internal.Security.RightsManagement { internal delegate int CallbackDelegate(StatusMessage status, int hr, IntPtr pvParam, // in the unmanaged SDK these 2 declared as void * IntPtr pvContext); // so the IntPtr is the right equivalent for both 64 and 32 bits // No need to synchronize access to these methods because they are only called on the user thread // This object is re-used during the same session which is why the event must be reset after the wait. // As a result of calling GC.SuppressFinalize(this) we also need to seal the class. As there is a danger // of subclass introducing it's own Finalizer which will not be called. ////// Critical: This class expose access to methods that eventually do one or more of the the following /// 1. call into unmanaged code /// 2. affects state/data that will eventually cross over unmanaged code boundary /// 3. Return some RM related information which is considered private /// [SecurityCritical(SecurityCriticalScope.Everything)] internal sealed class CallbackHandler : IDisposable { internal CallbackHandler() { _resetEvent = new AutoResetEvent(false); // initialized to a false non-signaled state _callbackDelegate = new CallbackDelegate(OnStatus); } internal CallbackDelegate CallbackDelegate { get { return _callbackDelegate; } } // this property is not to be accessed until WaitForCompletion returns internal string CallbackData { get { return _callbackData; } } // this is called from the user thread internal void WaitForCompletion() { _resetEvent.WaitOne(); // return to the reset state after unblocking current transaction (as it is an "Auto"ResetEvent) // second process possible managed exception from the other thread if (_exception != null) { // rethrow exception that was cought from a worker thread throw _exception; } Errors.ThrowOnErrorCode(_hr); } public void Dispose() { Dispose(true); GC.SuppressFinalize(this); } // this is the callback from the RM thread private int OnStatus(StatusMessage status, int hr, IntPtr pvParam, IntPtr pvContext) { if (hr == S_DRM_COMPLETED || hr < 0) { _exception = null; // we are resetting this variable, so that the instance of this class will be reusable even after exception try { _hr = hr; // we are assigning hr first as the next command can potentially throw, and we would like to have hr value preserved if (pvParam != IntPtr.Zero) { _callbackData = Marshal.PtrToStringUni(pvParam); } } // disabling PreSharp false positive. In this case we are actually re-throwing the same exception // on the application thread inside WaitForCompletion() function #pragma warning disable 56500 catch (Exception e) { // We catch all exceptions of the second worker thread (created by the unmanaged RM SDK) // preserve them , and then rethrow later on the main thread from the WaitForCompletion method _exception = e; } #pragma warning restore 56500 finally { // After this signal, OnStatus will NOT be invoked until we instigate another "transaction" // from the user thread. _resetEvent.Set(); } } return 0; } private void Dispose(bool disposing) { if (disposing) { if (_resetEvent != null) { _resetEvent.Set(); ((IDisposable)_resetEvent).Dispose(); } } } private CallbackDelegate _callbackDelegate; private AutoResetEvent _resetEvent; private string _callbackData; private int _hr; private Exception _exception; private const uint S_DRM_COMPLETED = 0x0004CF04; //success code } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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