1 files changed, 42 insertions, 0 deletions
diff --git a/dom/file/EmptyBlobImpl.h b/dom/file/EmptyBlobImpl.h
new file mode 100644
index 0000000000..a3b46ae54b
--- /dev/null
+++ b/dom/file/EmptyBlobImpl.h
@@ -0,0 +1,42 @@
+/* -*- 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 mozilla_dom_EmptyBlobImpl_h
+#define mozilla_dom_EmptyBlobImpl_h
+
+#include "BaseBlobImpl.h"
+
+namespace mozilla {
+namespace dom {
+
+class EmptyBlobImpl final : public BaseBlobImpl {
+ public:
+  NS_INLINE_DECL_REFCOUNTING_INHERITED(EmptyBlobImpl, BaseBlobImpl)
+
+  // Blob constructor.
+  explicit EmptyBlobImpl(const nsAString& aContentType)
+      : BaseBlobImpl(aContentType, 0 /* aLength */) {}
+
+  void CreateInputStream(nsIInputStream** aStream, ErrorResult& aRv) override;
+
+  already_AddRefed<BlobImpl> CreateSlice(uint64_t aStart, uint64_t aLength,
+                                         const nsAString& aContentType,
+                                         ErrorResult& aRv) override;
+
+  bool IsMemoryFile() const override { return true; }
+
+  void GetBlobImplType(nsAString& aBlobImplType) const override {
+    aBlobImplType = u"EmptyBlobImpl"_ns;
+  }
+
+ private:
+  ~EmptyBlobImpl() = default;
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // mozilla_dom_EmptyBlobImpl_h