1 files changed, 61 insertions, 0 deletions
diff --git a/dom/push/PushUtil.cpp b/dom/push/PushUtil.cpp
new file mode 100644
index 0000000000..beeb2f2ffa
--- /dev/null
+++ b/dom/push/PushUtil.cpp
@@ -0,0 +1,61 @@
+/* -*- 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/. */
+
+#include "mozilla/dom/PushUtil.h"
+#include "mozilla/dom/UnionTypes.h"
+
+namespace mozilla::dom {
+
+/* static */
+bool PushUtil::CopyArrayBufferToArray(const ArrayBuffer& aBuffer,
+                                      nsTArray<uint8_t>& aArray) {
+  MOZ_ASSERT(aArray.IsEmpty());
+  aBuffer.ComputeState();
+  return aArray.SetCapacity(aBuffer.Length(), fallible) &&
+         aArray.InsertElementsAt(0, aBuffer.Data(), aBuffer.Length(), fallible);
+}
+
+/* static */
+bool PushUtil::CopyArrayBufferViewToArray(const ArrayBufferView& aView,
+                                          nsTArray<uint8_t>& aArray) {
+  MOZ_ASSERT(aArray.IsEmpty());
+  aView.ComputeState();
+  return aArray.SetCapacity(aView.Length(), fallible) &&
+         aArray.InsertElementsAt(0, aView.Data(), aView.Length(), fallible);
+}
+
+/* static */
+bool PushUtil::CopyBufferSourceToArray(
+    const OwningArrayBufferViewOrArrayBuffer& aSource,
+    nsTArray<uint8_t>& aArray) {
+  if (aSource.IsArrayBuffer()) {
+    return CopyArrayBufferToArray(aSource.GetAsArrayBuffer(), aArray);
+  }
+  if (aSource.IsArrayBufferView()) {
+    return CopyArrayBufferViewToArray(aSource.GetAsArrayBufferView(), aArray);
+  }
+  MOZ_CRASH("Uninitialized union: expected buffer or view");
+}
+
+/* static */
+void PushUtil::CopyArrayToArrayBuffer(JSContext* aCx,
+                                      const nsTArray<uint8_t>& aArray,
+                                      JS::MutableHandle<JSObject*> aValue,
+                                      ErrorResult& aRv) {
+  if (aArray.IsEmpty()) {
+    aValue.set(nullptr);
+    return;
+  }
+  JS::Rooted<JSObject*> buffer(
+      aCx, ArrayBuffer::Create(aCx, aArray.Length(), aArray.Elements()));
+  if (NS_WARN_IF(!buffer)) {
+    aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
+    return;
+  }
+  aValue.set(buffer);
+}
+
+}  // namespace mozilla::dom