1 files changed, 40 insertions, 0 deletions
diff --git a/dom/streams/ByteStreamHelpers.h b/dom/streams/ByteStreamHelpers.h
new file mode 100644
index 0000000000..8557c9b16b
--- /dev/null
+++ b/dom/streams/ByteStreamHelpers.h
@@ -0,0 +1,40 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* 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_ByteStreamHelpers_h
+#define mozilla_dom_ByteStreamHelpers_h
+
+#include "js/TypeDecls.h"
+#include "mozilla/ErrorResult.h"
+#include "UnderlyingSourceCallbackHelpers.h"
+
+namespace mozilla::dom {
+
+class ReadableStream;
+class BodyStreamHolder;
+
+// https://streams.spec.whatwg.org/#transfer-array-buffer
+//
+// As some parts of the specifcation want to use the abrupt completion value,
+// this function may leave a pending exception if it returns nullptr.
+JSObject* TransferArrayBuffer(JSContext* aCx, JS::Handle<JSObject*> aObject);
+
+bool CanTransferArrayBuffer(JSContext* aCx, JS::Handle<JSObject*> aObject,
+                            ErrorResult& aRv);
+
+// If this returns null, it will leave a pending exception on aCx which
+// must be handled by the caller (in the spec this is always the case
+// currently).
+JSObject* CloneAsUint8Array(JSContext* aCx, JS::Handle<JSObject*> aObject);
+
+MOZ_CAN_RUN_SCRIPT void
+SetUpReadableByteStreamControllerFromBodyStreamUnderlyingSource(
+    JSContext* aCx, ReadableStream* aStream,
+    BodyStreamHolder* aUnderlyingSource, ErrorResult& aRv);
+
+}  // namespace mozilla::dom
+
+#endif