// static
already_AddRefed<ReadStream>
ReadStream::Create(const CacheReadStream& aReadStream)
{
// The parameter may or may not be for a Cache created stream. The way we
// tell is by looking at the stream control actor. If the actor exists,
// then we know the Cache created it.
if (!aReadStream.controlChild() && !aReadStream.controlParent()) {
return nullptr;
}
MOZ_ASSERT(!aReadStream.pushStreamChild());
MOZ_ASSERT(!aReadStream.pushStreamParent());
// Control is guaranteed to survive this method as ActorDestroy() cannot
// run on this thread until we complete.
StreamControl* control;
if (aReadStream.controlChild()) {
auto actor = static_cast<CacheStreamControlChild*>(aReadStream.controlChild());
control = actor;
} else {
auto actor = static_cast<CacheStreamControlParent*>(aReadStream.controlParent());
control = actor;
}
MOZ_ASSERT(control);
AutoTArray<FileDescriptor, 4> fds;
control->DeserializeFds(aReadStream, fds);
nsCOMPtr<nsIInputStream> stream =
DeserializeInputStream(aReadStream.params(), fds);
MOZ_ASSERT(stream);
// Currently we expect all cache read streams to be blocking file streams.
#ifdef DEBUG
nsCOMPtr<nsIAsyncInputStream> asyncStream = do_QueryInterface(stream);
MOZ_ASSERT(!asyncStream);
#endif
RefPtr<Inner> inner = new Inner(control, aReadStream.id(), stream);
RefPtr<ReadStream> ref = new ReadStream(inner);
return ref.forget();
}
