static JSObject*
GetDataStoresStructuredCloneCallbacksRead(JSContext* aCx,
JSStructuredCloneReader* aReader,
uint32_t aTag,
uint32_t aData,
void* aClosure)
{
WorkerPrivate* workerPrivate = GetWorkerPrivateFromContext(aCx);
MOZ_ASSERT(workerPrivate);
workerPrivate->AssertIsOnWorkerThread();
if (aTag != WORKER_DATA_STORES_TAG) {
MOZ_ASSERT(false, "aTag must be WORKER_DATA_STORES_TAG!");
return nullptr;
}
NS_ASSERTION(!aData, "aData should be empty");
// Read the holder from the buffer, which points to the data store.
nsMainThreadPtrHolder<DataStore>* dataStoreholder;
if (!JS_ReadBytes(aReader, &dataStoreholder, sizeof(dataStoreholder))) {
MOZ_ASSERT(false, "cannot read bytes for dataStoreholder!");
return nullptr;
}
// Protect workerStoreObj from moving GC during ~nsRefPtr.
JS::Rooted<JSObject*> workerStoreObj(aCx, nullptr);
{
nsRefPtr<WorkerDataStore> workerStore =
new WorkerDataStore(workerPrivate->GlobalScope());
nsMainThreadPtrHandle<DataStore> backingStore(dataStoreholder);
// When we're on the worker thread, prepare a DataStoreChangeEventProxy.
nsRefPtr<DataStoreChangeEventProxy> eventProxy =
new DataStoreChangeEventProxy(workerPrivate, workerStore);
// Add the DataStoreChangeEventProxy as an event listener on the main thread.
nsRefPtr<DataStoreAddEventListenerRunnable> runnable =
new DataStoreAddEventListenerRunnable(workerPrivate,
backingStore,
eventProxy);
runnable->Dispatch(aCx);
// Point WorkerDataStore to DataStore.
workerStore->SetBackingDataStore(backingStore);
JS::Rooted<JSObject*> global(aCx, JS::CurrentGlobalOrNull(aCx));
if (!global) {
MOZ_ASSERT(false, "cannot get global!");
} else {
workerStoreObj = workerStore->WrapObject(aCx);
if (!JS_WrapObject(aCx, &workerStoreObj)) {
MOZ_ASSERT(false, "cannot wrap object for workerStoreObj!");
workerStoreObj = nullptr;
}
}
}
return workerStoreObj;
}
// Helper functions for structured cloning
inline bool
ReadString(JSStructuredCloneReader* aReader, nsString& aString)
{
MOZ_ASSERT(aReader);
bool read;
uint32_t nameLength, zero;
read = JS_ReadUint32Pair(aReader, &nameLength, &zero);
if (!read) {
return false;
}
MOZ_ASSERT(zero == 0);
aString.SetLength(nameLength);
size_t charSize = sizeof(nsString::char_type);
read = JS_ReadBytes(aReader, (void*) aString.BeginWriting(),
nameLength * charSize);
if (!read) {
return false;
}
return true;
}
bool StructuredCloneBlob::Holder::ReadStructuredCloneInternal(
JSContext* aCx, JSStructuredCloneReader* aReader,
StructuredCloneHolder* aHolder) {
uint32_t length;
uint32_t version;
if (!JS_ReadUint32Pair(aReader, &length, &version)) {
return false;
}
uint32_t blobOffset;
uint32_t blobCount;
if (!JS_ReadUint32Pair(aReader, &blobOffset, &blobCount)) {
return false;
}
if (blobCount) {
#ifdef FUZZING
if (blobOffset >= aHolder->BlobImpls().Length()) {
return false;
}
#endif
BlobImpls().AppendElements(&aHolder->BlobImpls()[blobOffset], blobCount);
}
JSStructuredCloneData data(mStructuredCloneScope);
while (length) {
size_t size;
char* buffer = data.AllocateBytes(length, &size);
if (!buffer || !JS_ReadBytes(aReader, buffer, size)) {
return false;
}
length -= size;
}
mBuffer = MakeUnique<JSAutoStructuredCloneBuffer>(
mStructuredCloneScope, &StructuredCloneHolder::sCallbacks, this);
mBuffer->adopt(std::move(data), version, &StructuredCloneHolder::sCallbacks);
return true;
}
