1 files changed, 52 insertions, 0 deletions
diff --git a/dom/fs/include/fs/FileSystemThreadSafeStreamOwner.h b/dom/fs/include/fs/FileSystemThreadSafeStreamOwner.h
new file mode 100644
index 0000000000..3ef7639f36
--- /dev/null
+++ b/dom/fs/include/fs/FileSystemThreadSafeStreamOwner.h
@@ -0,0 +1,52 @@
+/* -*- 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/. */
+
+#ifndef DOM_FS_FILESYSTEMTHREADSAFESTREAMOWNER_H_
+#define DOM_FS_FILESYSTEMTHREADSAFESTREAMOWNER_H_
+
+#include "nsCOMPtr.h"
+
+class nsIOutputStream;
+class nsIRandomAccessStream;
+
+namespace mozilla::dom {
+
+class FileSystemWritableFileStream;
+
+namespace fs {
+
+class FileSystemThreadSafeStreamOwner {
+ public:
+  FileSystemThreadSafeStreamOwner(
+      FileSystemWritableFileStream* aWritableFileStream,
+      nsCOMPtr<nsIRandomAccessStream>&& aStream);
+
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(FileSystemThreadSafeStreamOwner)
+
+  nsresult Truncate(uint64_t aSize);
+
+  nsresult Seek(uint64_t aPosition);
+
+  void Close();
+
+  nsCOMPtr<nsIOutputStream> OutputStream();
+
+ protected:
+  virtual ~FileSystemThreadSafeStreamOwner() = default;
+
+ private:
+#ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED
+  FileSystemWritableFileStream* MOZ_NON_OWNING_REF mWritableFileStream;
+#endif
+  nsCOMPtr<nsIRandomAccessStream> mStream;
+
+  bool mClosed;
+};
+
+}  // namespace fs
+}  // namespace mozilla::dom
+
+#endif  // DOM_FS_FILESYSTEMTHREADSAFESTREAMOWNER_H_