dom/file/EmptyBlobImpl.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef mozilla_dom_EmptyBlobImpl_h
   8 #define mozilla_dom_EmptyBlobImpl_h
   9
  10 #include "BaseBlobImpl.h"
  11
  12 namespace mozilla::dom {
  13
  14 class EmptyBlobImpl final : public BaseBlobImpl {
  15  public:
  16   NS_INLINE_DECL_REFCOUNTING_INHERITED(EmptyBlobImpl, BaseBlobImpl)
  17
  18   // Blob constructor.
  19   explicit EmptyBlobImpl(const nsAString& aContentType)
  20       : BaseBlobImpl(aContentType, 0 /* aLength */) {}
  21
  22   void CreateInputStream(nsIInputStream** aStream,
  23                          ErrorResult& aRv) const override;
  24
  25   already_AddRefed<BlobImpl> CreateSlice(uint64_t aStart, uint64_t aLength,
  26                                          const nsAString& aContentType,
  27                                          ErrorResult& aRv) const override;
  28
  29   bool IsMemoryFile() const override { return true; }
  30
  31   void GetBlobImplType(nsAString& aBlobImplType) const override {
  32     aBlobImplType = u"EmptyBlobImpl"_ns;
  33   }
  34
  35  private:
  36   ~EmptyBlobImpl() override = default;
  37 };
  38
  39 }  // namespace mozilla::dom
  40
  41 #endif  // mozilla_dom_EmptyBlobImpl_h