1 files changed, 23 insertions, 0 deletions
diff --git a/ipc/glue/IPCMessageUtils.cpp b/ipc/glue/IPCMessageUtils.cpp
new file mode 100644
index 000000000..62af265ed
--- /dev/null
+++ b/ipc/glue/IPCMessageUtils.cpp
@@ -0,0 +1,23 @@
+/* -*- 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 "IPCMessageUtils.h"
+#include "mozilla/CheckedInt.h"
+
+namespace IPC {
+
+bool
+ByteLengthIsValid(uint32_t aNumElements, size_t aElementSize, int* aByteLength)
+{
+  auto length = mozilla::CheckedInt<int>(aNumElements) * aElementSize;
+  if (!length.isValid()) {
+    return false;
+  }
+  *aByteLength = length.value();
+  return true;
+}
+
+} // namespace IPC