diff -r 000000000000 -r 6474c204b198 content/base/src/FileIOObject.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/base/src/FileIOObject.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,106 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef FileIOObject_h__
+#define FileIOObject_h__
+
+#include "mozilla/DOMEventTargetHelper.h"
+#include "nsIChannel.h"
+#include "nsIFile.h"
+#include "nsIDOMFile.h"
+#include "nsIStreamListener.h"
+#include "nsITimer.h"
+#include "nsCOMPtr.h"
+
+#include "mozilla/dom/DOMError.h"
+
+#define NS_PROGRESS_EVENT_INTERVAL 50
+
+namespace mozilla {
+
+class ErrorResult;
+
+namespace dom {
+
+extern const uint64_t kUnknownSize;
+
+// A common base class for FileReader and FileSaver
+
+class FileIOObject : public DOMEventTargetHelper,
+                     public nsIStreamListener,
+                     public nsITimerCallback
+{
+public:
+  FileIOObject();
+
+  NS_DECL_ISUPPORTS_INHERITED
+
+  // Common methods
+  void Abort(ErrorResult& aRv);
+  uint16_t ReadyState() const
+  {
+    return mReadyState;
+  }
+  DOMError* GetError() const
+  {
+    return mError;
+  }
+
+  NS_METHOD GetOnabort(JSContext* aCx, JS::MutableHandle<JS::Value> aValue);
+  NS_METHOD SetOnabort(JSContext* aCx, JS::Handle<JS::Value> aValue);
+  NS_METHOD GetOnerror(JSContext* aCx, JS::MutableHandle<JS::Value> aValue);
+  NS_METHOD SetOnerror(JSContext* aCx, JS::Handle<JS::Value> aValue);
+  NS_METHOD GetOnprogress(JSContext* aCx, JS::MutableHandle<JS::Value> aValue);
+  NS_METHOD SetOnprogress(JSContext* aCx, JS::Handle<JS::Value> aValue);
+
+  IMPL_EVENT_HANDLER(abort)
+  IMPL_EVENT_HANDLER(error)
+  IMPL_EVENT_HANDLER(progress)
+
+  NS_DECL_NSITIMERCALLBACK
+
+  NS_DECL_NSISTREAMLISTENER
+
+  NS_DECL_NSIREQUESTOBSERVER
+
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(FileIOObject, DOMEventTargetHelper)
+
+protected:
+  // Implemented by the derived class to do whatever it needs to do for abort
+  virtual void DoAbort(nsAString& aEvent) = 0;
+  // for onStartRequest (this has a default impl since FileReader doesn't need
+  // special handling
+  NS_IMETHOD DoOnStartRequest(nsIRequest *aRequest, nsISupports *aContext);
+  // for onStopRequest
+  NS_IMETHOD DoOnStopRequest(nsIRequest *aRequest, nsISupports *aContext,
+                             nsresult aStatus, nsAString& aSuccessEvent,
+                             nsAString& aTerminationEvent) = 0;
+  // and for onDataAvailable
+  NS_IMETHOD DoOnDataAvailable(nsIRequest *aRequest, nsISupports *aContext,
+                               nsIInputStream *aInputStream, uint64_t aOffset,
+                               uint32_t aCount) = 0;
+
+  void StartProgressEventTimer();
+  void ClearProgressEventTimer();
+  void DispatchError(nsresult rv, nsAString& finalEvent);
+  nsresult DispatchProgressEvent(const nsAString& aType);
+
+  nsCOMPtr<nsITimer> mProgressNotifier;
+  bool mProgressEventWasDelayed;
+  bool mTimerIsActive;
+
+  nsRefPtr<DOMError> mError;
+  nsCOMPtr<nsIChannel> mChannel;
+
+  uint16_t mReadyState;
+
+  uint64_t mTotal;
+  uint64_t mTransferred;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif