1 files changed, 76 insertions, 0 deletions
diff --git a/dom/fetch/FetchStreamReader.h b/dom/fetch/FetchStreamReader.h
new file mode 100644
index 0000000000..6b28136f8f
--- /dev/null
+++ b/dom/fetch/FetchStreamReader.h
@@ -0,0 +1,76 @@
+/* -*- 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_FetchStreamReader_h
+#define mozilla_dom_FetchStreamReader_h
+
+#include "js/RootingAPI.h"
+#include "js/TypeDecls.h"
+#include "mozilla/dom/FetchBinding.h"
+#include "mozilla/dom/PromiseNativeHandler.h"
+#include "nsIAsyncOutputStream.h"
+#include "nsIGlobalObject.h"
+
+namespace mozilla {
+namespace dom {
+
+class WeakWorkerRef;
+
+class FetchStreamReader final : public nsIOutputStreamCallback,
+                                public PromiseNativeHandler {
+ public:
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_AMBIGUOUS(
+      FetchStreamReader, nsIOutputStreamCallback)
+  NS_DECL_NSIOUTPUTSTREAMCALLBACK
+
+  // This creates a nsIInputStream able to retrieve data from the ReadableStream
+  // object. The reading starts when StartConsuming() is called.
+  static nsresult Create(JSContext* aCx, nsIGlobalObject* aGlobal,
+                         FetchStreamReader** aStreamReader,
+                         nsIInputStream** aInputStream);
+
+  void ResolvedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue) override;
+
+  void RejectedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue) override;
+
+  // Idempotently close the output stream and null out all state. If aCx is
+  // provided, the reader will also be canceled.  aStatus must be a DOM error
+  // as understood by DOMException because it will be provided as the
+  // cancellation reason.
+  void CloseAndRelease(JSContext* aCx, nsresult aStatus);
+
+  void StartConsuming(JSContext* aCx, JS::HandleObject aStream,
+                      JS::MutableHandle<JSObject*> aReader, ErrorResult& aRv);
+
+ private:
+  explicit FetchStreamReader(nsIGlobalObject* aGlobal);
+  ~FetchStreamReader();
+
+  nsresult WriteBuffer();
+
+  void ReportErrorToConsole(JSContext* aCx, JS::Handle<JS::Value> aValue);
+
+  nsCOMPtr<nsIGlobalObject> mGlobal;
+  nsCOMPtr<nsIEventTarget> mOwningEventTarget;
+
+  nsCOMPtr<nsIAsyncOutputStream> mPipeOut;
+
+  RefPtr<WeakWorkerRef> mWorkerRef;
+
+  JS::Heap<JSObject*> mReader;
+
+  nsTArray<uint8_t> mBuffer;
+  uint32_t mBufferRemaining;
+  uint32_t mBufferOffset;
+
+  bool mStreamClosed;
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // mozilla_dom_FetchStreamReader_h