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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 http://mozilla.org/MPL/2.0/. */
#include "mozilla/dom/ReadableStreamBYOBRequest.h"
#include "mozilla/dom/ByteStreamHelpers.h"
#include "js/ArrayBuffer.h"
#include "js/TypeDecls.h"
#include "mozilla/dom/ReadableByteStreamController.h"
#include "mozilla/dom/ReadableStream.h"
#include "mozilla/dom/ReadableStreamBYOBRequestBinding.h"
#include "js/experimental/TypedData.h"
#include "mozilla/dom/ReadableStreamController.h"
#include "nsCOMPtr.h"
#include "nsIGlobalObject.h"
#include "nsWrapperCache.h"
namespace mozilla::dom {
using namespace streams_abstract;
ReadableStreamBYOBRequest::ReadableStreamBYOBRequest(nsIGlobalObject* aGlobal)
: mGlobal(aGlobal) {
mozilla::HoldJSObjects(this);
}
ReadableStreamBYOBRequest::~ReadableStreamBYOBRequest() {
mozilla::DropJSObjects(this);
}
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_WITH_JS_MEMBERS(ReadableStreamBYOBRequest,
(mGlobal, mController),
(mView))
NS_IMPL_CYCLE_COLLECTING_ADDREF(ReadableStreamBYOBRequest)
NS_IMPL_CYCLE_COLLECTING_RELEASE(ReadableStreamBYOBRequest)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ReadableStreamBYOBRequest)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
JSObject* ReadableStreamBYOBRequest::WrapObject(
JSContext* aCx, JS::Handle<JSObject*> aGivenProto) {
return ReadableStreamBYOBRequest_Binding::Wrap(aCx, this, aGivenProto);
}
// https://streams.spec.whatwg.org/#rs-byob-request-view
void ReadableStreamBYOBRequest::GetView(
JSContext* cx, JS::MutableHandle<JSObject*> aRetVal) const {
// Step 1.
aRetVal.set(mView);
}
// https://streams.spec.whatwg.org/#rs-byob-request-respond
void ReadableStreamBYOBRequest::Respond(JSContext* aCx, uint64_t bytesWritten,
ErrorResult& aRv) {
// Step 1.
if (!mController) {
aRv.ThrowTypeError("Undefined Controller");
return;
}
// Step 2.
bool isSharedMemory;
JS::Rooted<JSObject*> view(aCx, mView);
JS::Rooted<JSObject*> arrayBuffer(
aCx, JS_GetArrayBufferViewBuffer(aCx, view, &isSharedMemory));
if (!arrayBuffer) {
aRv.StealExceptionFromJSContext(aCx);
return;
}
if (JS::IsDetachedArrayBufferObject(arrayBuffer)) {
aRv.ThrowTypeError("View of Detached buffer");
return;
}
// Step 3.
MOZ_ASSERT(JS_GetArrayBufferViewByteLength(view) > 0);
// Step 4.
MOZ_ASSERT(JS::GetArrayBufferByteLength(arrayBuffer) > 0);
// Step 5.
RefPtr<ReadableByteStreamController> controller(mController);
ReadableByteStreamControllerRespond(aCx, controller, bytesWritten, aRv);
}
// https://streams.spec.whatwg.org/#rs-byob-request-respond-with-new-view
void ReadableStreamBYOBRequest::RespondWithNewView(JSContext* aCx,
const ArrayBufferView& view,
ErrorResult& aRv) {
// Step 1.
if (!mController) {
aRv.ThrowTypeError("Undefined Controller");
return;
}
// Step 2.
bool isSharedMemory;
JS::Rooted<JSObject*> rootedViewObj(aCx, view.Obj());
JS::Rooted<JSObject*> viewedArrayBuffer(
aCx, JS_GetArrayBufferViewBuffer(aCx, rootedViewObj, &isSharedMemory));
if (!viewedArrayBuffer) {
aRv.StealExceptionFromJSContext(aCx);
return;
}
if (JS::IsDetachedArrayBufferObject(viewedArrayBuffer)) {
aRv.ThrowTypeError("View of Detatched Array Buffer");
return;
}
// Step 3.
RefPtr<ReadableByteStreamController> controller(mController);
ReadableByteStreamControllerRespondWithNewView(aCx, controller, rootedViewObj,
aRv);
}
void ReadableStreamBYOBRequest::SetController(
ReadableByteStreamController* aController) {
mController = aController;
}
} // namespace mozilla::dom
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