/// /// Thread Proc /// internal static void DownloadThreadProc() { Queue workQueue = _workQueue; for (;;) { _waitEvent.WaitOne(); while (workQueue.Count != 0) { QueueEntry entry = (QueueEntry)workQueue.Dequeue(); #pragma warning disable 6500 // Catch all exceptions and marshal them to the correct thread try { entry.inputStream.BeginRead( entry.readBuffer, 0, READ_SIZE, _readCallback, entry ); } catch (Exception e) { MarshalException(entry, e); } finally { // // This method never exits, and 'entry' is _not_ scoped // to the while loop, so if we don't null entry out it will // be rooted while _waitEvent.WaitOne() blocks. // entry = null; } #pragma warning restore 6500 } } }
/// /// Begin a download /// internal static void BeginDownload( BitmapDecoder decoder, Uri uri, RequestCachePolicy uriCachePolicy, Stream stream ) { lock (_syncLock) { if (!_thread.IsAlive) { _thread.IsBackground = true; _thread.Start(); } } QueueEntry entry; // If there is already a download for this uri, just add the decoder to the list if (uri != null) { lock (_syncLock) { if (_uriTable[uri] != null) { entry = (QueueEntry)_uriTable[uri]; entry.decoders.Add(new WeakReference(decoder)); return; } } } entry = new QueueEntry(); entry.decoders = new List <WeakReference>(); lock (_syncLock) { entry.decoders.Add(new WeakReference(decoder)); } entry.inputUri = uri; entry.inputStream = stream; string cacheFolder = MS.Win32.WinInet.InternetCacheFolder.LocalPath; bool passed = false; new SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Assert(); // BlessedAssert try { // Get the file path StringBuilder tmpFileName = new StringBuilder(NativeMethods.MAX_PATH); MS.Win32.UnsafeNativeMethods.GetTempFileName(cacheFolder, "WPF", 0, tmpFileName); try { string pathToUse = tmpFileName.ToString(); SafeFileHandle fileHandle = MS.Win32.UnsafeNativeMethods.CreateFile( pathToUse, NativeMethods.GENERIC_READ | NativeMethods.GENERIC_WRITE, /* dwDesiredAccess */ 0, /* dwShare */ null, /* lpSecurityAttributes */ NativeMethods.CREATE_ALWAYS, /* dwCreationDisposition */ NativeMethods.FILE_ATTRIBUTE_TEMPORARY | NativeMethods.FILE_FLAG_DELETE_ON_CLOSE, /* dwFlagsAndAttributes */ IntPtr.Zero /* hTemplateFile */ ); if (fileHandle.IsInvalid) { throw new Win32Exception(); } entry.outputStream = new FileStream(fileHandle, FileAccess.ReadWrite); entry.streamPath = pathToUse; passed = true; } catch (Exception e) { if (CriticalExceptions.IsCriticalException(e)) { throw; } } } finally { SecurityPermission.RevertAssert(); } if (!passed) { throw new IOException(SR.Get(SRID.Image_CannotCreateTempFile)); } entry.readBuffer = new byte[READ_SIZE]; entry.contentLength = -1; entry.contentType = string.Empty; entry.lastPercent = 0; // Add the entry to the table if we know the uri if (uri != null) { lock (_syncLock) { _uriTable[uri] = entry; } } if (stream == null) { bool fElevate = false; if (uri.Scheme == Uri.UriSchemeHttp || uri.Scheme == Uri.UriSchemeHttps) { SecurityHelper.BlockCrossDomainForHttpsApps(uri); // In this case we first check to see if the consumer has media permissions for // safe media (Site of Origin + Cross domain), if it // does we assert and run the code that requires the assert if (SecurityHelper.CallerHasMediaPermission(MediaPermissionAudio.NoAudio, MediaPermissionVideo.NoVideo, MediaPermissionImage.SafeImage)) { fElevate = true; } } // This is the case where we are accessing an http image from an http site and we have media permission if (fElevate) { (new WebPermission(NetworkAccess.Connect, BindUriHelper.UriToString(uri))).Assert(); // BlessedAssert } try { entry.webRequest = WpfWebRequestHelper.CreateRequest(uri); if (uriCachePolicy != null) { entry.webRequest.CachePolicy = uriCachePolicy; } } finally { if (fElevate) { WebPermission.RevertAssert(); } } entry.webRequest.BeginGetResponse(_responseCallback, entry); } else { _workQueue.Enqueue(entry); // Signal _waitEvent.Set(); } }
/// /// Read callback /// private static void ReadCallback(IAsyncResult result) { QueueEntry entry = (QueueEntry)result.AsyncState; int bytesRead = 0; #pragma warning disable 6500 try { bytesRead = entry.inputStream.EndRead(result); } catch (Exception e) { MarshalException(entry, e); } #pragma warning restore 6500 if (bytesRead == 0) { // // We're done reading from the input stream. // entry.inputStream.Close(); entry.inputStream = null; // // We're done writing to the output stream. Make sure everything // is written to disk. // entry.outputStream.Flush(); entry.outputStream.Seek(0, SeekOrigin.Begin); lock (_syncLock) { // Fire download progress & completion event for each decoder foreach (WeakReference decoderReference in entry.decoders) { LateBoundBitmapDecoder decoder = decoderReference.Target as LateBoundBitmapDecoder; if (decoder != null) { // // Marshal events to UI thread // MarshalEvents( decoder, new DispatcherOperationCallback(decoder.ProgressCallback), 100 ); MarshalEvents( decoder, new DispatcherOperationCallback(decoder.DownloadCallback), entry.outputStream ); } } } // Delete entry from uri table if (entry.inputUri != null) { lock (_syncLock) { _uriTable[entry.inputUri] = null; } } } else { entry.outputStream.Write(entry.readBuffer, 0, bytesRead); if (entry.contentLength > 0) { int percentComplete = (int)Math.Floor(100.0 * (double)entry.outputStream.Length / (double)entry.contentLength); // Only raise if percentage went up by ~1% (ie value changed). if (percentComplete != entry.lastPercent) { // Update last value entry.lastPercent = percentComplete; lock (_syncLock) { // Fire download progress event for each decoder foreach (WeakReference decoderReference in entry.decoders) { LateBoundBitmapDecoder decoder = decoderReference.Target as LateBoundBitmapDecoder; if (decoder != null) { // // Marshal events to UI thread // MarshalEvents( decoder, new DispatcherOperationCallback(decoder.ProgressCallback), percentComplete ); } } } } } _workQueue.Enqueue(entry); _waitEvent.Set(); } }
/// /// Marshal an exception to the Dispatcher thread /// private static void MarshalException( QueueEntry entry, Exception e ) { lock (_syncLock) { // Fire download completion event for each decoder foreach (LateBoundBitmapDecoder decoder in entry.decoders) { MarshalEvents( decoder, new DispatcherOperationCallback(decoder.ExceptionCallback), e ); } if (entry.inputUri != null) { lock (_syncLock) { _uriTable[entry.inputUri] = null; } } } }
internal static void BeginDownload( BitmapDecoder decoder, Uri uri, RequestCachePolicy uriCachePolicy, Stream stream ) { lock (_syncLock) { if (!_thread.IsAlive) { _thread.IsBackground = true; _thread.Start(); } } QueueEntry entry; // If there is already a download for this uri, just add the decoder to the list if (uri != null) { lock (_syncLock) { if (_uriTable[uri] != null) { entry = (QueueEntry)_uriTable[uri]; entry.decoders.Add(decoder); return; } } } entry = new QueueEntry(); entry.decoders = new List<BitmapDecoder>(); lock (_syncLock) { entry.decoders.Add(decoder); } entry.inputUri = uri; entry.inputStream = stream; string cacheFolder = MS.Win32.WinInet.InternetCacheFolder.LocalPath; bool passed = false; new SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Assert(); // BlessedAssert try { // Get the file path StringBuilder tmpFileName = new StringBuilder(NativeMethods.MAX_PATH); MS.Win32.UnsafeNativeMethods.GetTempFileName(cacheFolder, "WPF", 0, tmpFileName); try { string pathToUse = tmpFileName.ToString(); SafeFileHandle fileHandle = MS.Win32.UnsafeNativeMethods.CreateFile( pathToUse, NativeMethods.GENERIC_READ | NativeMethods.GENERIC_WRITE, /* dwDesiredAccess */ 0, /* dwShare */ null, /* lpSecurityAttributes */ NativeMethods.CREATE_ALWAYS, /* dwCreationDisposition */ NativeMethods.FILE_ATTRIBUTE_TEMPORARY | NativeMethods.FILE_FLAG_DELETE_ON_CLOSE, /* dwFlagsAndAttributes */ IntPtr.Zero /* hTemplateFile */ ); if (fileHandle.IsInvalid) { throw new Win32Exception(); } entry.outputStream = new FileStream(fileHandle, FileAccess.ReadWrite); entry.streamPath = pathToUse; passed = true; } catch(Exception e) { if (CriticalExceptions.IsCriticalException(e)) { throw; } } } finally { SecurityPermission.RevertAssert(); } if (!passed) { throw new IOException(SR.Get(SRID.Image_CannotCreateTempFile)); } entry.readBuffer = new byte[READ_SIZE]; entry.contentLength = -1; entry.contentType = string.Empty; entry.lastPercent = 0; // Add the entry to the table if we know the uri if (uri != null) { lock (_syncLock) { _uriTable[uri] = entry; } } if (stream == null) { bool fElevate = false; if (uri.Scheme == Uri.UriSchemeHttp || uri.Scheme == Uri.UriSchemeHttps) { SecurityHelper.BlockCrossDomainForHttpsApps(uri); // In this case we first check to see if the consumer has media permissions for // safe media (Site of Origin + Cross domain), if it // does we assert and run the code that requires the assert if (SecurityHelper.CallerHasMediaPermission(MediaPermissionAudio.NoAudio, MediaPermissionVideo.NoVideo, MediaPermissionImage.SafeImage)) { fElevate = true; } } // This is the case where we are accessing an http image from an http site and we have media permission if (fElevate) { (new WebPermission(NetworkAccess.Connect, BindUriHelper.UriToString(uri))).Assert(); // BlessedAssert } try { entry.webRequest = WpfWebRequestHelper.CreateRequest(uri); if (uriCachePolicy != null) { entry.webRequest.CachePolicy = uriCachePolicy; } } finally { if(fElevate) { WebPermission.RevertAssert(); } } entry.webRequest.BeginGetResponse(_responseCallback, entry); } else { _workQueue.Enqueue(entry); // Signal _waitEvent.Set(); } }
/// /// Begin a download /// internal static void BeginDownload( BitmapDecoder decoder, Uri uri, RequestCachePolicy uriCachePolicy, Stream stream ) { lock (_syncLock) { if (!_thread.IsAlive) { _thread.IsBackground = true; _thread.Start(); } } QueueEntry entry; // If there is already a download for this uri, just add the decoder to the list if (uri != null) { lock (_syncLock) { if (_uriTable[uri] != null) { entry = (QueueEntry)_uriTable[uri]; entry.decoders.Add(new WeakReference(decoder)); return; } } } entry = new QueueEntry(); entry.decoders = new List <WeakReference>(); lock (_syncLock) { entry.decoders.Add(new WeakReference(decoder)); } entry.inputUri = uri; entry.inputStream = stream; string cacheFolder = MS.Win32.WinInet.InternetCacheFolder.LocalPath; bool passed = false; new SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Assert(); // BlessedAssert try { // Get the file path StringBuilder tmpFileName = new StringBuilder(NativeMethods.MAX_PATH); MS.Win32.UnsafeNativeMethods.GetTempFileName(cacheFolder, "WPF", 0, tmpFileName); try { string pathToUse = tmpFileName.ToString(); SafeFileHandle fileHandle = MS.Win32.UnsafeNativeMethods.CreateFile( pathToUse, NativeMethods.GENERIC_READ | NativeMethods.GENERIC_WRITE, /* dwDesiredAccess */ 0, /* dwShare */ null, /* lpSecurityAttributes */ NativeMethods.CREATE_ALWAYS, /* dwCreationDisposition */ NativeMethods.FILE_ATTRIBUTE_TEMPORARY | NativeMethods.FILE_FLAG_DELETE_ON_CLOSE, /* dwFlagsAndAttributes */ IntPtr.Zero /* hTemplateFile */ ); if (fileHandle.IsInvalid) { throw new Win32Exception(); } entry.outputStream = new FileStream(fileHandle, FileAccess.ReadWrite); entry.streamPath = pathToUse; passed = true; } catch (Exception e) { if (CriticalExceptions.IsCriticalException(e)) { throw; } } } finally { SecurityPermission.RevertAssert(); } if (!passed) { throw new IOException(SR.Get(SRID.Image_CannotCreateTempFile)); } entry.readBuffer = new byte[READ_SIZE]; entry.contentLength = -1; entry.contentType = string.Empty; entry.lastPercent = 0; // Add the entry to the table if we know the uri if (uri != null) { lock (_syncLock) { _uriTable[uri] = entry; } } if (stream == null) { entry.webRequest = WpfWebRequestHelper.CreateRequest(uri); if (uriCachePolicy != null) { entry.webRequest.CachePolicy = uriCachePolicy; } entry.webRequest.BeginGetResponse(_responseCallback, entry); } else { _workQueue.Enqueue(entry); // Signal _waitEvent.Set(); } }