ndnboost: Include boost::iostreams for internal use.
diff --git a/include/ndnboost/iostreams/constants.hpp b/include/ndnboost/iostreams/constants.hpp
new file mode 100644
index 0000000..25393d5
--- /dev/null
+++ b/include/ndnboost/iostreams/constants.hpp
@@ -0,0 +1,42 @@
+// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
+// (C) Copyright 2003-2007 Jonathan Turkanis
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
+
+// See http://www.boost.org/libs/iostreams for documentation.
+
+// Contains constants used by library.
+
+#ifndef NDNBOOST_IOSTREAMS_CONSTANTS_HPP_INCLUDED
+#define NDNBOOST_IOSTREAMS_CONSTANTS_HPP_INCLUDED
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+#ifndef NDNBOOST_IOSTREAMS_DEFAULT_DEVICE_BUFFER_SIZE
+# define NDNBOOST_IOSTREAMS_DEFAULT_DEVICE_BUFFER_SIZE 4096
+#endif
+
+#ifndef NDNBOOST_IOSTREAMS_DEFAULT_FILTER_BUFFER_SIZE
+# define NDNBOOST_IOSTREAMS_DEFAULT_FILTER_BUFFER_SIZE 128
+#endif
+
+#ifndef NDNBOOST_IOSTREAMS_DEFAULT_PBACK_BUFFER_SIZE
+# define NDNBOOST_IOSTREAMS_DEFAULT_PBACK_BUFFER_SIZE 4
+#endif
+
+#include <ndnboost/iostreams/detail/ios.hpp> // streamsize.
+
+namespace ndnboost { namespace iostreams {
+
+const std::streamsize default_device_buffer_size =
+ NDNBOOST_IOSTREAMS_DEFAULT_DEVICE_BUFFER_SIZE;
+const std::streamsize default_filter_buffer_size =
+ NDNBOOST_IOSTREAMS_DEFAULT_FILTER_BUFFER_SIZE;
+const std::streamsize default_pback_buffer_size =
+ NDNBOOST_IOSTREAMS_DEFAULT_PBACK_BUFFER_SIZE;
+
+} } // End namespaces iostreams, boost.
+
+#endif // #ifndef NDNBOOST_IOSTREAMS_CONSTANTS_HPP_INCLUDED