diff -r 000000000000 -r 6474c204b198 dom/ipc/FilePickerParent.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/ipc/FilePickerParent.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,233 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set sw=4 ts=8 et tw=80 :
+ * 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/. */
+
+#include "FilePickerParent.h"
+#include "nsComponentManagerUtils.h"
+#include "nsDOMFile.h"
+#include "nsNetCID.h"
+#include "nsIDocument.h"
+#include "nsIDOMFile.h"
+#include "nsIDOMWindow.h"
+#include "nsIFile.h"
+#include "nsISimpleEnumerator.h"
+#include "mozilla/unused.h"
+#include "mozilla/dom/ContentParent.h"
+#include "mozilla/dom/Element.h"
+#include "mozilla/dom/TabParent.h"
+#include "mozilla/dom/ipc/Blob.h"
+
+using mozilla::unused;
+using namespace mozilla::dom;
+
+NS_IMPL_ISUPPORTS(FilePickerParent::FilePickerShownCallback,
+                  nsIFilePickerShownCallback);
+
+NS_IMETHODIMP
+FilePickerParent::FilePickerShownCallback::Done(int16_t aResult)
+{
+  if (mFilePickerParent) {
+    mFilePickerParent->Done(aResult);
+  }
+  return NS_OK;
+}
+
+void
+FilePickerParent::FilePickerShownCallback::Destroy()
+{
+  mFilePickerParent = nullptr;
+}
+
+FilePickerParent::~FilePickerParent()
+{
+}
+
+// Before sending a blob to the child, we need to get its size and modification
+// date. Otherwise it will be sent as a "mystery blob" by
+// GetOrCreateActorForBlob, which will cause problems for the child
+// process. This runnable stat()s the file off the main thread.
+//
+// We run code in three places:
+// 1. The main thread calls Dispatch() to start the runnable.
+// 2. The stream transport thread stat()s the file in Run() and then dispatches
+// the same runnable on the main thread.
+// 3. The main thread sends the results over IPC.
+FilePickerParent::FileSizeAndDateRunnable::FileSizeAndDateRunnable(FilePickerParent *aFPParent,
+                                                                   nsCOMArray<nsIDOMFile>& aDomfiles)
+ : mFilePickerParent(aFPParent)
+{
+  mDomfiles.SwapElements(aDomfiles);
+}
+
+bool
+FilePickerParent::FileSizeAndDateRunnable::Dispatch()
+{
+  MOZ_ASSERT(NS_IsMainThread());
+
+  mEventTarget = do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID);
+  if (!mEventTarget) {
+    return false;
+  }
+
+  nsresult rv = mEventTarget->Dispatch(this, NS_DISPATCH_NORMAL);
+  return NS_SUCCEEDED(rv);
+}
+
+NS_IMETHODIMP
+FilePickerParent::FileSizeAndDateRunnable::Run()
+{
+  // If we're on the main thread, then that means we're done. Just send the
+  // results.
+  if (NS_IsMainThread()) {
+    if (mFilePickerParent) {
+      mFilePickerParent->SendFiles(mDomfiles);
+    }
+    return NS_OK;
+  }
+
+  // We're not on the main thread, so do the stat().
+  for (unsigned i = 0; i < mDomfiles.Length(); i++) {
+    uint64_t size, lastModified;
+    mDomfiles[i]->GetSize(&size);
+    mDomfiles[i]->GetMozLastModifiedDate(&lastModified);
+  }
+
+  // Dispatch ourselves back on the main thread.
+  if (NS_FAILED(NS_DispatchToMainThread(this, NS_DISPATCH_NORMAL))) {
+    // It's hard to see how we can recover gracefully in this case. The child
+    // process is waiting for an IPC, but that can only happen on the main
+    // thread.
+    MOZ_CRASH();
+  }
+  return NS_OK;
+}
+
+void
+FilePickerParent::FileSizeAndDateRunnable::Destroy()
+{
+  mFilePickerParent = nullptr;
+}
+
+void
+FilePickerParent::SendFiles(const nsCOMArray<nsIDOMFile>& aDomfiles)
+{
+  ContentParent* parent = static_cast<ContentParent*>(Manager()->Manager());
+  InfallibleTArray<PBlobParent*> files;
+
+  for (unsigned i = 0; i < aDomfiles.Length(); i++) {
+    BlobParent* blob = parent->GetOrCreateActorForBlob(aDomfiles[i]);
+    if (blob) {
+      files.AppendElement(blob);
+    }
+  }
+
+  InputFiles infiles;
+  infiles.filesParent().SwapElements(files);
+  unused << Send__delete__(this, infiles, mResult);
+}
+
+void
+FilePickerParent::Done(int16_t aResult)
+{
+  mResult = aResult;
+
+  if (mResult != nsIFilePicker::returnOK) {
+    unused << Send__delete__(this, void_t(), mResult);
+    return;
+  }
+
+  nsCOMArray<nsIDOMFile> domfiles;
+  if (mMode == nsIFilePicker::modeOpenMultiple) {
+    nsCOMPtr<nsISimpleEnumerator> iter;
+    NS_ENSURE_SUCCESS_VOID(mFilePicker->GetFiles(getter_AddRefs(iter)));
+
+    nsCOMPtr<nsISupports> supports;
+    bool loop = true;
+    while (NS_SUCCEEDED(iter->HasMoreElements(&loop)) && loop) {
+      iter->GetNext(getter_AddRefs(supports));
+      if (supports) {
+        nsCOMPtr<nsIFile> file = do_QueryInterface(supports);
+        nsCOMPtr<nsIDOMFile> domfile = new nsDOMFileFile(file);
+        domfiles.AppendElement(domfile);
+      }
+    }
+  } else {
+    nsCOMPtr<nsIFile> file;
+    mFilePicker->GetFile(getter_AddRefs(file));
+    if (file) {
+      nsCOMPtr<nsIDOMFile> domfile = new nsDOMFileFile(file);
+      domfiles.AppendElement(domfile);
+    }
+  }
+
+  MOZ_ASSERT(!mRunnable);
+  mRunnable = new FileSizeAndDateRunnable(this, domfiles);
+  if (!mRunnable->Dispatch()) {
+    unused << Send__delete__(this, void_t(), nsIFilePicker::returnCancel);
+  }
+}
+
+bool
+FilePickerParent::CreateFilePicker()
+{
+  mFilePicker = do_CreateInstance("@mozilla.org/filepicker;1");
+  if (!mFilePicker) {
+    return false;
+  }
+
+  Element* element = static_cast<TabParent*>(Manager())->GetOwnerElement();
+  if (!element) {
+    return false;
+  }
+
+  nsCOMPtr<nsIDOMWindow> window = do_QueryInterface(element->OwnerDoc()->GetWindow());
+  if (!window) {
+    return false;
+  }
+
+  return NS_SUCCEEDED(mFilePicker->Init(window, mTitle, mMode));
+}
+
+bool
+FilePickerParent::RecvOpen(const int16_t& aSelectedType,
+                           const bool& aAddToRecentDocs,
+                           const nsString& aDefaultFile,
+                           const nsString& aDefaultExtension,
+                           const InfallibleTArray<nsString>& aFilters,
+                           const InfallibleTArray<nsString>& aFilterNames)
+{
+  if (!CreateFilePicker()) {
+    unused << Send__delete__(this, void_t(), nsIFilePicker::returnCancel);
+    return true;
+  }
+
+  mFilePicker->SetAddToRecentDocs(aAddToRecentDocs);
+
+  for (uint32_t i = 0; i < aFilters.Length(); ++i) {
+    mFilePicker->AppendFilter(aFilterNames[i], aFilters[i]);
+  }
+
+  mFilePicker->SetDefaultString(aDefaultFile);
+  mFilePicker->SetDefaultExtension(aDefaultExtension);
+  mFilePicker->SetFilterIndex(aSelectedType);
+
+  mCallback = new FilePickerShownCallback(this);
+
+  mFilePicker->Open(mCallback);
+  return true;
+}
+
+void
+FilePickerParent::ActorDestroy(ActorDestroyReason aWhy)
+{
+  if (mCallback) {
+    mCallback->Destroy();
+    mCallback = nullptr;
+  }
+  if (mRunnable) {
+    mRunnable->Destroy();
+    mRunnable = nullptr;
+  }
+}