1 files changed, 51 insertions, 0 deletions
diff --git a/ipc/glue/IPCStreamUtils.h b/ipc/glue/IPCStreamUtils.h
new file mode 100644
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+++ b/ipc/glue/IPCStreamUtils.h
@@ -0,0 +1,51 @@
+/* -*- 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/. */
+
+#ifndef mozilla_ipc_IPCStreamUtils_h
+#define mozilla_ipc_IPCStreamUtils_h
+
+#include "mozilla/ipc/IPCStream.h"
+#include "nsCOMPtr.h"
+#include "nsIInputStream.h"
+
+namespace mozilla::ipc {
+
+// Serialize an IPCStream to be sent over IPC fallibly.
+//
+// If |aAllowLazy| is true the stream may be serialized as a
+// RemoteLazyInputStream when being sent from child to parent.
+//
+// ParamTraits<nsIInputStream> may be used instead if serialization cannot be
+// fallible.
+[[nodiscard]] bool SerializeIPCStream(
+    already_AddRefed<nsIInputStream> aInputStream, IPCStream& aValue,
+    bool aAllowLazy);
+
+// If serialization fails, `aValue` will be initialized to `Nothing()`, so this
+// return value is safe to ignore.
+bool SerializeIPCStream(already_AddRefed<nsIInputStream> aInputStream,
+                        Maybe<IPCStream>& aValue, bool aAllowLazy);
+
+// Deserialize an IPCStream received from an actor call.  These methods
+// work in both the child and parent.
+already_AddRefed<nsIInputStream> DeserializeIPCStream(const IPCStream& aValue);
+
+already_AddRefed<nsIInputStream> DeserializeIPCStream(
+    const Maybe<IPCStream>& aValue);
+
+}  // namespace mozilla::ipc
+
+namespace IPC {
+
+template <>
+struct ParamTraits<nsIInputStream*> {
+  static void Write(MessageWriter* aWriter, nsIInputStream* aParam);
+  static bool Read(MessageReader* aReader, RefPtr<nsIInputStream>* aResult);
+};
+
+}  // namespace IPC
+
+#endif  // mozilla_ipc_IPCStreamUtils_h