1 files changed, 46 insertions, 0 deletions
diff --git a/dom/fs/parent/FileSystemParentTypes.h b/dom/fs/parent/FileSystemParentTypes.h
new file mode 100644
index 0000000000..15cfe42bb0
--- /dev/null
+++ b/dom/fs/parent/FileSystemParentTypes.h
@@ -0,0 +1,46 @@
+/* -*- 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_PARENT_FILESYSTEMPARENTTYPES_H_
+#define DOM_FS_PARENT_FILESYSTEMPARENTTYPES_H_
+
+#include "nsStringFwd.h"
+#include "nsTString.h"
+
+namespace mozilla::dom::fs {
+
+/**
+ * @brief FileId refers to a file on disk while EntryId refers to a path.
+ * Same user input path will always generate the same EntryId while the FileId
+ * can be different. Move methods can change the FileId which underlies
+ * an EntryId and multiple FileIds for temporary files can all map to the same
+ * EntryId.
+ */
+struct FileId {
+  explicit FileId(const nsCString& aValue) : mValue(aValue) {}
+
+  explicit FileId(nsCString&& aValue) : mValue(std::move(aValue)) {}
+
+  constexpr bool IsEmpty() const { return mValue.IsEmpty(); }
+
+  constexpr const nsCString& Value() const { return mValue; }
+
+  nsCString mValue;
+};
+
+inline bool operator==(const FileId& aLhs, const FileId& aRhs) {
+  return aLhs.mValue == aRhs.mValue;
+}
+
+inline bool operator!=(const FileId& aLhs, const FileId& aRhs) {
+  return aLhs.mValue != aRhs.mValue;
+}
+
+enum class FileMode { EXCLUSIVE, SHARED_FROM_EMPTY, SHARED_FROM_COPY };
+
+}  // namespace mozilla::dom::fs
+
+#endif  // DOM_FS_PARENT_FILESYSTEMPARENTTYPES_H_