1 files changed, 119 insertions, 0 deletions
diff --git a/dom/file/ipc/RemoteLazyInputStreamUtils.cpp b/dom/file/ipc/RemoteLazyInputStreamUtils.cpp
new file mode 100644
index 0000000000..33fce73e14
--- /dev/null
+++ b/dom/file/ipc/RemoteLazyInputStreamUtils.cpp
@@ -0,0 +1,119 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 "RemoteLazyInputStreamUtils.h"
+#include "RemoteLazyInputStream.h"
+#include "RemoteLazyInputStreamChild.h"
+#include "RemoteLazyInputStreamParent.h"
+#include "mozilla/ipc/BackgroundParent.h"
+#include "mozilla/ipc/PBackgroundParent.h"
+#include "mozilla/dom/ContentParent.h"
+#include "mozilla/ipc/IPCStreamUtils.h"
+#include "RemoteLazyInputStreamStorage.h"
+#include "StreamBlobImpl.h"
+
+namespace mozilla {
+
+namespace {
+
+template <typename M>
+nsresult SerializeInputStreamParent(nsIInputStream* aInputStream,
+                                    uint64_t aSize, uint64_t aChildID,
+                                    PRemoteLazyInputStreamParent*& aActorParent,
+                                    M* aManager) {
+  // Parent to Child we always send a RemoteLazyInputStream.
+  MOZ_ASSERT(XRE_IsParentProcess());
+
+  nsCOMPtr<nsIInputStream> stream = aInputStream;
+
+  // In case this is a RemoteLazyInputStream, we don't want to create a loop:
+  // RemoteLazyInputStreamParent -> RemoteLazyInputStream ->
+  // RemoteLazyInputStreamParent. Let's use the underlying inputStream instead.
+  nsCOMPtr<mozIRemoteLazyInputStream> remoteLazyInputStream =
+      do_QueryInterface(aInputStream);
+  if (remoteLazyInputStream) {
+    stream = remoteLazyInputStream->GetInternalStream();
+    // If we don't have an underlying stream, it's better to terminate here
+    // instead of sending an 'empty' RemoteLazyInputStream actor on the other
+    // side, unable to be used.
+    if (NS_WARN_IF(!stream)) {
+      return NS_ERROR_FAILURE;
+    }
+  }
+
+  nsresult rv;
+  RefPtr<RemoteLazyInputStreamParent> parentActor =
+      RemoteLazyInputStreamParent::Create(stream, aSize, aChildID, &rv,
+                                          aManager);
+  if (!parentActor) {
+    return rv;
+  }
+
+  if (!aManager->SendPRemoteLazyInputStreamConstructor(
+          parentActor, parentActor->ID(), parentActor->Size())) {
+    return NS_ERROR_FAILURE;
+  }
+
+  aActorParent = parentActor;
+  return NS_OK;
+}
+
+}  // anonymous namespace
+
+// static
+nsresult RemoteLazyInputStreamUtils::SerializeInputStream(
+    nsIInputStream* aInputStream, uint64_t aSize, RemoteLazyStream& aOutStream,
+    dom::ContentParent* aManager) {
+  PRemoteLazyInputStreamParent* actor = nullptr;
+  nsresult rv = SerializeInputStreamParent(
+      aInputStream, aSize, aManager->ChildID(), actor, aManager);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  aOutStream = actor;
+  return NS_OK;
+}
+
+// static
+nsresult RemoteLazyInputStreamUtils::SerializeInputStream(
+    nsIInputStream* aInputStream, uint64_t aSize, RemoteLazyStream& aOutStream,
+    mozilla::ipc::PBackgroundParent* aManager) {
+  PRemoteLazyInputStreamParent* actor = nullptr;
+  nsresult rv = SerializeInputStreamParent(
+      aInputStream, aSize, mozilla::ipc::BackgroundParent::GetChildID(aManager),
+      actor, aManager);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  aOutStream = actor;
+  return NS_OK;
+}
+
+// static
+nsresult RemoteLazyInputStreamUtils::SerializeInputStream(
+    nsIInputStream* aInputStream, uint64_t aSize, RemoteLazyStream& aOutStream,
+    dom::ContentChild* aManager) {
+  mozilla::ipc::AutoIPCStream ipcStream(true /* delayed start */);
+  if (!ipcStream.Serialize(aInputStream, aManager)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  aOutStream = ipcStream.TakeValue();
+  return NS_OK;
+}
+
+// static
+nsresult RemoteLazyInputStreamUtils::SerializeInputStream(
+    nsIInputStream* aInputStream, uint64_t aSize, RemoteLazyStream& aOutStream,
+    mozilla::ipc::PBackgroundChild* aManager) {
+  mozilla::ipc::AutoIPCStream ipcStream(true /* delayed start */);
+  if (!ipcStream.Serialize(aInputStream, aManager)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  aOutStream = ipcStream.TakeValue();
+  return NS_OK;
+}
+
+}  // namespace mozilla