1 files changed, 123 insertions, 0 deletions
diff --git a/dom/file/ipc/RemoteLazyInputStreamParent.cpp b/dom/file/ipc/RemoteLazyInputStreamParent.cpp
new file mode 100644
index 0000000000..d92c529546
--- /dev/null
+++ b/dom/file/ipc/RemoteLazyInputStreamParent.cpp
@@ -0,0 +1,123 @@
+/* -*- 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 "RemoteLazyInputStreamParent.h"
+#include "RemoteLazyInputStreamStorage.h"
+#include "mozilla/InputStreamLengthHelper.h"
+#include "mozilla/ipc/Endpoint.h"
+#include "mozilla/ipc/IPCStreamUtils.h"
+#include "mozilla/ipc/InputStreamParams.h"
+#include "mozilla/ipc/ProtocolUtils.h"
+#include "nsStreamUtils.h"
+#include "nsServiceManagerUtils.h"
+#include "nsNetCID.h"
+
+namespace mozilla {
+
+extern mozilla::LazyLogModule gRemoteLazyStreamLog;
+
+RemoteLazyInputStreamParent::RemoteLazyInputStreamParent(const nsID& aID)
+    : mID(aID) {
+  auto storage = RemoteLazyInputStreamStorage::Get().unwrapOr(nullptr);
+  if (storage) {
+    storage->ActorCreated(mID);
+  }
+}
+
+void RemoteLazyInputStreamParent::ActorDestroy(
+    IProtocol::ActorDestroyReason aReason) {
+  auto storage = RemoteLazyInputStreamStorage::Get().unwrapOr(nullptr);
+  if (storage) {
+    storage->ActorDestroyed(mID);
+  }
+}
+
+mozilla::ipc::IPCResult RemoteLazyInputStreamParent::RecvClone(
+    mozilla::ipc::Endpoint<PRemoteLazyInputStreamParent>&& aCloneEndpoint) {
+  if (!aCloneEndpoint.IsValid()) {
+    return IPC_FAIL(this, "Unexpected invalid endpoint in RecvClone");
+  }
+
+  MOZ_LOG(gRemoteLazyStreamLog, LogLevel::Debug,
+          ("Parent::RecvClone %s", nsIDToCString(mID).get()));
+
+  auto* newActor = new RemoteLazyInputStreamParent(mID);
+  aCloneEndpoint.Bind(newActor);
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult RemoteLazyInputStreamParent::RecvStreamNeeded(
+    uint64_t aStart, uint64_t aLength, StreamNeededResolver&& aResolver) {
+  nsCOMPtr<nsIInputStream> stream;
+  auto storage = RemoteLazyInputStreamStorage::Get().unwrapOr(nullptr);
+  if (storage) {
+    storage->GetStream(mID, aStart, aLength, getter_AddRefs(stream));
+  }
+
+  if (!stream) {
+    MOZ_LOG(gRemoteLazyStreamLog, LogLevel::Warning,
+            ("Parent::RecvStreamNeeded not available! %s",
+             nsIDToCString(mID).get()));
+    aResolver(Nothing());
+    return IPC_OK();
+  }
+
+  Maybe<IPCStream> ipcStream;
+  if (NS_WARN_IF(!SerializeIPCStream(stream.forget(), ipcStream,
+                                     /* aAllowLazy */ false))) {
+    return IPC_FAIL(this, "IPCStream serialization failed!");
+  }
+
+  MOZ_LOG(gRemoteLazyStreamLog, LogLevel::Verbose,
+          ("Parent::RecvStreamNeeded resolve %s", nsIDToCString(mID).get()));
+  aResolver(ipcStream);
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult RemoteLazyInputStreamParent::RecvLengthNeeded(
+    LengthNeededResolver&& aResolver) {
+  nsCOMPtr<nsIInputStream> stream;
+  auto storage = RemoteLazyInputStreamStorage::Get().unwrapOr(nullptr);
+  if (storage) {
+    storage->GetStream(mID, 0, UINT64_MAX, getter_AddRefs(stream));
+  }
+
+  if (!stream) {
+    MOZ_LOG(gRemoteLazyStreamLog, LogLevel::Warning,
+            ("Parent::RecvLengthNeeded not available! %s",
+             nsIDToCString(mID).get()));
+    aResolver(-1);
+    return IPC_OK();
+  }
+
+  int64_t length = -1;
+  if (InputStreamLengthHelper::GetSyncLength(stream, &length)) {
+    MOZ_LOG(gRemoteLazyStreamLog, LogLevel::Verbose,
+            ("Parent::RecvLengthNeeded sync resolve %" PRId64 "! %s", length,
+             nsIDToCString(mID).get()));
+    aResolver(length);
+    return IPC_OK();
+  }
+
+  InputStreamLengthHelper::GetAsyncLength(
+      stream, [aResolver, id = mID](int64_t aLength) {
+        MOZ_LOG(gRemoteLazyStreamLog, LogLevel::Verbose,
+                ("Parent::RecvLengthNeeded async resolve %" PRId64 "! %s",
+                 aLength, nsIDToCString(id).get()));
+        aResolver(aLength);
+      });
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult RemoteLazyInputStreamParent::RecvGoodbye() {
+  MOZ_LOG(gRemoteLazyStreamLog, LogLevel::Verbose,
+          ("Parent::RecvGoodbye! %s", nsIDToCString(mID).get()));
+  Close();
+  return IPC_OK();
+}
+
+}  // namespace mozilla