diff -r 000000000000 -r 6474c204b198 netwerk/base/src/nsNetSegmentUtils.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/netwerk/base/src/nsNetSegmentUtils.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,23 @@
+/* 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 nsNetSegmentUtils_h__
+#define nsNetSegmentUtils_h__
+
+#include "nsIOService.h"
+
+/**
+ * applies defaults to segment params in a consistent way.
+ */
+static inline void
+net_ResolveSegmentParams(uint32_t &segsize, uint32_t &segcount)
+{
+    if (!segsize)
+        segsize = nsIOService::gDefaultSegmentSize;
+
+    if (!segcount)
+        segcount = nsIOService::gDefaultSegmentCount;
+}
+
+#endif // !nsNetSegmentUtils_h__