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/* -*- 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 */
#include "mozilla/dom/ByteLengthQueuingStrategy.h"
#include "mozilla/dom/FunctionBinding.h"
#include "mozilla/dom/QueuingStrategyBinding.h"
#include "nsCOMPtr.h"
#include "nsISupports.h"
#include "js/TypeDecls.h"
#include "js/PropertyAndElement.h"
namespace mozilla::dom {
NS_IMPL_ADDREF_INHERITED(ByteLengthQueuingStrategy, BaseQueuingStrategy)
NS_IMPL_RELEASE_INHERITED(ByteLengthQueuingStrategy, BaseQueuingStrategy)
/* static */
ByteLengthQueuingStrategy::Constructor(const GlobalObject& aGlobal,
const QueuingStrategyInit& aInit) {
RefPtr<ByteLengthQueuingStrategy> strategy = new ByteLengthQueuingStrategy(
aGlobal.GetAsSupports(), aInit.mHighWaterMark);
return strategy.forget();
JSObject* ByteLengthQueuingStrategy::WrapObject(
JSContext* aCx, JS::Handle<JSObject*> aGivenProto) {
return ByteLengthQueuingStrategy_Binding::Wrap(aCx, this, aGivenProto);
static bool ByteLengthQueuingStrategySize(JSContext* cx, unsigned argc,
JS::Value* vp) {
JS::CallArgs args = CallArgsFromVp(argc, vp);
// Step 1: Return ? GetV(chunk, "byteLength").
JS::Rooted<JSObject*> chunkObj(cx, JS::ToObject(cx, args.get(0)));
if (!chunkObj) {
return false;
return JS_GetProperty(cx, chunkObj, "byteLength", args.rval());
already_AddRefed<Function> ByteLengthQueuingStrategy::GetSize(
ErrorResult& aRv) {
// Step 1. Return this's relevant global object's ByteLength queuing strategy
// size function.
if (RefPtr<Function> fun =
mGlobal->GetByteLengthQueuingStrategySizeFunction()) {
return fun.forget();
// Note: Instead of eagerly allocating a size function for every global object
// we do it lazily once in this getter.
// After this point the steps refer to:
AutoJSAPI jsapi;
if (!jsapi.Init(mGlobal)) {
aRv.ThrowUnknownError("Internal error");
return nullptr;
JSContext* cx =;
// Step 1. Let steps be the following steps, given chunk
// Note: See ByteLengthQueuingStrategySize instead.
// Step 2. Let F be !CreateBuiltinFunction(steps, 1, "size", « »,
// globalObject’s relevant Realm).
JS::Rooted<JSFunction*> sizeFunction(
cx, JS_NewFunction(cx, ByteLengthQueuingStrategySize, 1, 0, "size"));
if (!sizeFunction) {
return nullptr;
// Step 3. Set globalObject’s byte length queuing strategy size function to
// a Function that represents a reference to F,
// with callback context equal to globalObject’s relevant settings object.
JS::Rooted<JSObject*> funObj(cx, JS_GetFunctionObject(sizeFunction));
JS::Rooted<JSObject*> global(cx, mGlobal->GetGlobalJSObject());
RefPtr<Function> function = new Function(cx, funObj, global, mGlobal);
return function.forget();
} // namespace mozilla::dom