diff -r 000000000000 -r 6474c204b198 dom/indexedDB/FileInfo.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/indexedDB/FileInfo.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,118 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=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 mozilla_dom_indexeddb_fileinfo_h__
+#define mozilla_dom_indexeddb_fileinfo_h__
+
+#include "IndexedDatabase.h"
+
+#include "FileManager.h"
+#include "IndexedDatabaseManager.h"
+
+BEGIN_INDEXEDDB_NAMESPACE
+
+class FileInfo
+{
+  friend class FileManager;
+
+public:
+  FileInfo(FileManager* aFileManager)
+  : mFileManager(aFileManager)
+  { }
+
+  virtual ~FileInfo()
+  { }
+
+  static
+  FileInfo* Create(FileManager* aFileManager, int64_t aId);
+
+  void AddRef()
+  {
+    if (IndexedDatabaseManager::IsClosed()) {
+      ++mRefCnt;
+    }
+    else {
+      UpdateReferences(mRefCnt, 1);
+    }
+  }
+
+  void Release()
+  {
+    if (IndexedDatabaseManager::IsClosed()) {
+      nsrefcnt count = --mRefCnt;
+      if (count == 0) {
+        mRefCnt = 1;
+        delete this;
+      }
+    }
+    else {
+      UpdateReferences(mRefCnt, -1);
+    }
+  }
+
+  void UpdateDBRefs(int32_t aDelta)
+  {
+    UpdateReferences(mDBRefCnt, aDelta);
+  }
+
+  void ClearDBRefs()
+  {
+    UpdateReferences(mDBRefCnt, 0, true);
+  }
+
+  void UpdateSliceRefs(int32_t aDelta)
+  {
+    UpdateReferences(mSliceRefCnt, aDelta);
+  }
+
+  void GetReferences(int32_t* aRefCnt, int32_t* aDBRefCnt,
+                     int32_t* aSliceRefCnt);
+
+  FileManager* Manager() const
+  {
+    return mFileManager;
+  }
+
+  virtual int64_t Id() const = 0;
+
+private:
+  void UpdateReferences(ThreadSafeAutoRefCnt& aRefCount, int32_t aDelta,
+                        bool aClear = false);
+  void Cleanup();
+
+  ThreadSafeAutoRefCnt mRefCnt;
+  ThreadSafeAutoRefCnt mDBRefCnt;
+  ThreadSafeAutoRefCnt mSliceRefCnt;
+
+  nsRefPtr<FileManager> mFileManager;
+};
+
+#define FILEINFO_SUBCLASS(_bits)                                              \
+class FileInfo##_bits : public FileInfo                                       \
+{                                                                             \
+public:                                                                       \
+  FileInfo##_bits(FileManager* aFileManager, int##_bits##_t aId)              \
+  : FileInfo(aFileManager), mId(aId)                                          \
+  { }                                                                         \
+                                                                              \
+  virtual int64_t Id() const                                                  \
+  {                                                                           \
+    return mId;                                                               \
+  }                                                                           \
+                                                                              \
+private:                                                                      \
+  int##_bits##_t mId;                                                         \
+};
+
+FILEINFO_SUBCLASS(16)
+FILEINFO_SUBCLASS(32)
+FILEINFO_SUBCLASS(64)
+
+#undef FILEINFO_SUBCLASS
+
+END_INDEXEDDB_NAMESPACE
+
+#endif // mozilla_dom_indexeddb_fileinfo_h__