diff -r 000000000000 -r 6474c204b198 media/mtransport/databuffer.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/media/mtransport/databuffer.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,47 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=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/. */
+
+// Original author: ekr@rtfm.com
+
+#ifndef databuffer_h__
+#define databuffer_h__
+#include <algorithm>
+#include <mozilla/Scoped.h>
+#include <m_cpp_utils.h>
+#include <nsISupportsImpl.h>
+
+namespace mozilla {
+
+class DataBuffer {
+ public:
+  DataBuffer() : data_(nullptr), len_(0) {}
+  DataBuffer(const uint8_t *data, size_t len) {
+    Assign(data, len);
+  }
+
+  void Assign(const uint8_t *data, size_t len) {
+    data_ = new unsigned char[ len ? len : 1];  // Don't depend on new [0].
+    memcpy(static_cast<void *>(data_.get()),
+           static_cast<const void *>(data), len);
+    len_ = len;
+  }
+
+  const uint8_t *data() const { return data_; }
+  size_t len() const { return len_; }
+  const bool empty() const { return len_ != 0; }
+
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(DataBuffer)
+
+private:
+  ScopedDeleteArray<uint8_t> data_;
+  size_t len_;
+
+  DISALLOW_COPY_ASSIGN(DataBuffer);
+};
+
+}
+
+#endif