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8683b183cd
MozReview-Commit-ID: aK3ljfCJVi --HG-- extra : rebase_source : d788c6c686cc72b423ca100795a379d343c398db
206 lines
5.6 KiB
C++
206 lines
5.6 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/dom/StructuredCloneBlob.h"
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#include "js/StructuredClone.h"
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#include "js/Utility.h"
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#include "jswrapper.h"
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#include "xpcpublic.h"
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#include "mozilla/Maybe.h"
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#include "mozilla/UniquePtr.h"
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#include "mozilla/dom/StructuredCloneTags.h"
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namespace mozilla {
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namespace dom {
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StructuredCloneBlob::StructuredCloneBlob()
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: StructuredCloneHolder(CloningSupported, TransferringNotSupported,
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StructuredCloneScope::DifferentProcess)
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{}
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StructuredCloneBlob::~StructuredCloneBlob()
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{
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UnregisterWeakMemoryReporter(this);
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}
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/* static */ already_AddRefed<StructuredCloneBlob>
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StructuredCloneBlob::Constructor(GlobalObject& aGlobal, JS::HandleValue aValue,
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JS::HandleObject aTargetGlobal,
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ErrorResult& aRv)
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{
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JSContext* cx = aGlobal.Context();
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RefPtr<StructuredCloneBlob> holder = StructuredCloneBlob::Create();
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Maybe<JSAutoCompartment> ac;
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JS::RootedValue value(cx, aValue);
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if (aTargetGlobal) {
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JS::RootedObject targetGlobal(cx, js::CheckedUnwrap(aTargetGlobal));
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if (!targetGlobal) {
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js::ReportAccessDenied(cx);
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aRv.NoteJSContextException(cx);
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return nullptr;
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}
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ac.emplace(cx, targetGlobal);
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if (!JS_WrapValue(cx, &value)) {
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aRv.NoteJSContextException(cx);
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return nullptr;
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}
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} else if (value.isObject()) {
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JS::RootedObject obj(cx, js::CheckedUnwrap(&value.toObject()));
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if (!obj) {
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js::ReportAccessDenied(cx);
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aRv.NoteJSContextException(cx);
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return nullptr;
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}
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ac.emplace(cx, obj);
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value = JS::ObjectValue(*obj);
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}
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holder->Write(cx, value, aRv);
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if (aRv.Failed()) {
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return nullptr;
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}
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return holder.forget();
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}
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void
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StructuredCloneBlob::Deserialize(JSContext* aCx, JS::HandleObject aTargetScope,
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JS::MutableHandleValue aResult, ErrorResult& aRv)
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{
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JS::RootedObject scope(aCx, js::CheckedUnwrap(aTargetScope));
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if (!scope) {
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js::ReportAccessDenied(aCx);
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aRv.NoteJSContextException(aCx);
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return;
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}
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{
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JSAutoCompartment ac(aCx, scope);
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Read(xpc::NativeGlobal(scope), aCx, aResult, aRv);
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if (aRv.Failed()) {
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return;
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}
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}
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if (!JS_WrapValue(aCx, aResult)) {
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aResult.set(JS::UndefinedValue());
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aRv.NoteJSContextException(aCx);
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}
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}
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/* static */ JSObject*
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StructuredCloneBlob::ReadStructuredClone(JSContext* aCx, JSStructuredCloneReader* aReader,
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StructuredCloneHolder* aHolder)
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{
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JS::RootedObject obj(aCx);
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{
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RefPtr<StructuredCloneBlob> holder = StructuredCloneBlob::Create();
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if (!holder->ReadStructuredCloneInternal(aCx, aReader, aHolder) ||
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!holder->WrapObject(aCx, nullptr, &obj)) {
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return nullptr;
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}
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}
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return obj.get();
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}
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bool
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StructuredCloneBlob::ReadStructuredCloneInternal(JSContext* aCx, JSStructuredCloneReader* aReader,
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StructuredCloneHolder* aHolder)
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{
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uint32_t length;
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uint32_t version;
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if (!JS_ReadUint32Pair(aReader, &length, &version)) {
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return false;
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}
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uint32_t blobOffset;
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uint32_t blobCount;
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if (!JS_ReadUint32Pair(aReader, &blobOffset, &blobCount)) {
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return false;
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}
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if (blobCount) {
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BlobImpls().AppendElements(&aHolder->BlobImpls()[blobOffset], blobCount);
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}
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JSStructuredCloneData data;
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while (length) {
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size_t size;
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char* buffer = data.AllocateBytes(length, &size);
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if (!buffer || !JS_ReadBytes(aReader, buffer, size)) {
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return false;
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}
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length -= size;
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}
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mBuffer = MakeUnique<JSAutoStructuredCloneBuffer>(mStructuredCloneScope,
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&StructuredCloneHolder::sCallbacks,
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this);
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mBuffer->adopt(Move(data), version, &StructuredCloneHolder::sCallbacks);
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return true;
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}
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bool
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StructuredCloneBlob::WriteStructuredClone(JSContext* aCx, JSStructuredCloneWriter* aWriter,
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StructuredCloneHolder* aHolder)
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{
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auto& data = mBuffer->data();
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if (!JS_WriteUint32Pair(aWriter, SCTAG_DOM_STRUCTURED_CLONE_HOLDER, 0) ||
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!JS_WriteUint32Pair(aWriter, data.Size(), JS_STRUCTURED_CLONE_VERSION) ||
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!JS_WriteUint32Pair(aWriter, aHolder->BlobImpls().Length(), BlobImpls().Length())) {
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return false;
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}
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aHolder->BlobImpls().AppendElements(BlobImpls());
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auto iter = data.Iter();
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while (!iter.Done()) {
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if (!JS_WriteBytes(aWriter, iter.Data(), iter.RemainingInSegment())) {
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return false;
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}
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iter.Advance(data, iter.RemainingInSegment());
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}
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return true;
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}
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bool
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StructuredCloneBlob::WrapObject(JSContext* aCx, JS::HandleObject aGivenProto, JS::MutableHandleObject aResult)
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{
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return StructuredCloneHolderBinding::Wrap(aCx, this, aGivenProto, aResult);
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}
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NS_IMETHODIMP
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StructuredCloneBlob::CollectReports(nsIHandleReportCallback* aHandleReport,
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nsISupports* aData, bool aAnonymize)
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{
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MOZ_COLLECT_REPORT(
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"explicit/dom/structured-clone-holder", KIND_HEAP, UNITS_BYTES,
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MallocSizeOf(this) + SizeOfExcludingThis(MallocSizeOf),
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"Memory used by StructuredCloneHolder DOM objects.");
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return NS_OK;
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}
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NS_IMPL_ISUPPORTS(StructuredCloneBlob, nsIMemoryReporter)
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} // namespace dom
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} // namespace mozilla
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