1 files changed, 71 insertions, 0 deletions
diff --git a/dom/file/FileCreatorHelper.cpp b/dom/file/FileCreatorHelper.cpp
new file mode 100644
index 0000000000..fcd72ca351
--- /dev/null
+++ b/dom/file/FileCreatorHelper.cpp
@@ -0,0 +1,71 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 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 "FileCreatorHelper.h"
+
+#include "mozilla/dom/BindingDeclarations.h"
+#include "mozilla/dom/FileBinding.h"
+#include "mozilla/dom/FileCreatorChild.h"
+#include "mozilla/ipc/BackgroundChild.h"
+#include "mozilla/ipc/PBackgroundChild.h"
+#include "mozilla/dom/File.h"
+#include "mozilla/dom/Promise.h"
+#include "nsContentUtils.h"
+#include "nsPIDOMWindow.h"
+#include "nsProxyRelease.h"
+#include "nsIFile.h"
+
+// Undefine the macro of CreateFile to avoid FileCreatorHelper#CreateFile being
+// replaced by FileCreatorHelper#CreateFileW.
+#ifdef CreateFile
+#  undef CreateFile
+#endif
+
+namespace mozilla::dom {
+
+/* static */
+already_AddRefed<Promise> FileCreatorHelper::CreateFile(
+    nsIGlobalObject* aGlobalObject, nsIFile* aFile,
+    const ChromeFilePropertyBag& aBag, bool aIsFromNsIFile, ErrorResult& aRv) {
+  MOZ_DIAGNOSTIC_ASSERT(NS_IsMainThread());
+
+  RefPtr<Promise> promise = Promise::Create(aGlobalObject, aRv);
+  if (NS_WARN_IF(aRv.Failed())) {
+    return nullptr;
+  }
+
+  nsAutoString path;
+  aRv = aFile->GetPath(path);
+  if (NS_WARN_IF(aRv.Failed())) {
+    return nullptr;
+  }
+
+  // Register this component to PBackground.
+  mozilla::ipc::PBackgroundChild* actorChild =
+      mozilla::ipc::BackgroundChild::GetOrCreateForCurrentThread();
+  if (NS_WARN_IF(!actorChild)) {
+    aRv.Throw(NS_ERROR_FAILURE);
+    return nullptr;
+  }
+
+  Maybe<int64_t> lastModified;
+  if (aBag.mLastModified.WasPassed()) {
+    lastModified.emplace(aBag.mLastModified.Value());
+  }
+
+  PFileCreatorChild* actor = actorChild->SendPFileCreatorConstructor(
+      path, aBag.mType, aBag.mName, lastModified, aBag.mExistenceCheck,
+      aIsFromNsIFile);
+  if (!actor) {
+    aRv.Throw(NS_ERROR_FAILURE);
+    return nullptr;
+  }
+
+  static_cast<FileCreatorChild*>(actor)->SetPromise(promise);
+  return promise.forget();
+}
+
+}  // namespace mozilla::dom