diff --git a/helper/ccnb-parser/syntax-tree/udata.cc b/helper/ccnb-parser/syntax-tree/udata.cc
new file mode 100644
index 0000000..cd69aba
--- /dev/null
+++ b/helper/ccnb-parser/syntax-tree/udata.cc
@@ -0,0 +1,48 @@
+/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2011 University of California, Los Angeles
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Author: Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ */
+
+#include "udata.h"
+
+namespace ns3 {
+namespace ndn {
+namespace CcnbParser {
+
+Udata::Udata (Buffer::Iterator &start, uint32_t length)
+{
+  // Ideally, the code should look like this. Unfortunately, we don't have normal compatible iterators
+  // Buffer::Iterator realStart = start;
+  // start.Next (length); // advancing forward
+  // m_udata.assign (realStart, start/*actually, it is the end*/);
+
+  m_udata.reserve (length+1); //just in case we will need \0 at the end later
+  // this is actually the way Read method is implemented in network/src/buffer.cc
+  uint32_t i = 0;
+  for (; !start.IsEnd () && i < length; i++)
+    {
+      m_udata.push_back (start.ReadU8 ());
+    }
+
+  if (i < length && start.IsEnd ())
+    throw CcnbDecodingException ();
+}
+
+}
+}
+}