1 files changed, 48 insertions, 0 deletions
diff --git a/js/src/builtin/streams/PullIntoDescriptor.cpp b/js/src/builtin/streams/PullIntoDescriptor.cpp
new file mode 100644
index 0000000000..1b6c99a45b
--- /dev/null
+++ b/js/src/builtin/streams/PullIntoDescriptor.cpp
@@ -0,0 +1,48 @@
+/* -*- 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/. */
+
+/* Pull descriptor objects for tracking byte stream pull-into requests. */
+
+#include "builtin/streams/PullIntoDescriptor.h"
+
+#include <stdint.h>  // uint32_t
+
+#include "js/Class.h"       // JSClass, JSCLASS_HAS_RESERVED_SLOTS
+#include "js/RootingAPI.h"  // JS::Handle, JS::Rooted
+
+#include "vm/JSObject-inl.h"  // js::NewBuiltinClassInstance
+
+using js::PullIntoDescriptor;
+
+using JS::Handle;
+using JS::Int32Value;
+using JS::ObjectOrNullValue;
+using JS::ObjectValue;
+using JS::Rooted;
+
+/* static */ PullIntoDescriptor* PullIntoDescriptor::create(
+    JSContext* cx, Handle<ArrayBufferObject*> buffer, uint32_t byteOffset,
+    uint32_t byteLength, uint32_t bytesFilled, uint32_t elementSize,
+    Handle<JSObject*> ctor, ReaderType readerType) {
+  Rooted<PullIntoDescriptor*> descriptor(
+      cx, NewBuiltinClassInstance<PullIntoDescriptor>(cx));
+  if (!descriptor) {
+    return nullptr;
+  }
+
+  descriptor->setFixedSlot(Slot_buffer, ObjectValue(*buffer));
+  descriptor->setFixedSlot(Slot_Ctor, ObjectOrNullValue(ctor));
+  descriptor->setFixedSlot(Slot_ByteOffset, Int32Value(byteOffset));
+  descriptor->setFixedSlot(Slot_ByteLength, Int32Value(byteLength));
+  descriptor->setFixedSlot(Slot_BytesFilled, Int32Value(bytesFilled));
+  descriptor->setFixedSlot(Slot_ElementSize, Int32Value(elementSize));
+  descriptor->setFixedSlot(Slot_ReaderType,
+                           Int32Value(static_cast<int32_t>(readerType)));
+  return descriptor;
+}
+
+const JSClass PullIntoDescriptor::class_ = {
+    "PullIntoDescriptor", JSCLASS_HAS_RESERVED_SLOTS(SlotCount)};