ndnboost: Include boost::iostreams for internal use.
diff --git a/include/ndnboost/iostreams/skip.hpp b/include/ndnboost/iostreams/skip.hpp
new file mode 100644
index 0000000..6b5a600
--- /dev/null
+++ b/include/ndnboost/iostreams/skip.hpp
@@ -0,0 +1,112 @@
+// (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.
+
+// To do: handle bidirection streams and output-seekable components.
+
+#ifndef NDNBOOST_IOSTREAMS_SKIP_HPP_INCLUDED
+#define NDNBOOST_IOSTREAMS_SKIP_HPP_INCLUDED
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+#include <ndnboost/iostreams/char_traits.hpp>
+#include <ndnboost/iostreams/detail/ios.hpp> // failure.
+#include <ndnboost/iostreams/operations.hpp>
+#include <ndnboost/iostreams/seek.hpp>
+#include <ndnboost/iostreams/traits.hpp>
+#include <ndnboost/mpl/and.hpp>
+#include <ndnboost/mpl/bool.hpp>
+#include <ndnboost/mpl/or.hpp>
+#include <ndnboost/throw_exception.hpp>
+#include <ndnboost/type_traits/is_convertible.hpp>
+
+namespace ndnboost { namespace iostreams {
+
+namespace detail {
+
+template<typename Device>
+void skip(Device& dev, stream_offset off, mpl::true_)
+{ iostreams::seek(dev, off, NDNBOOST_IOS::cur); }
+
+template<typename Device>
+void skip(Device& dev, stream_offset off, mpl::false_)
+{ // gcc 2.95 needs namespace qualification for char_traits.
+ typedef typename char_type_of<Device>::type char_type;
+ typedef iostreams::char_traits<char_type> traits_type;
+ for (stream_offset z = 0; z < off; ) {
+ typename traits_type::int_type c;
+ if (traits_type::is_eof(c = iostreams::get(dev)))
+ ndnboost::throw_exception(NDNBOOST_IOSTREAMS_FAILURE("bad skip offset"));
+ if (!traits_type::would_block(c))
+ ++z;
+ }
+}
+
+template<typename Filter, typename Device>
+void skip( Filter& flt, Device& dev, stream_offset off,
+ NDNBOOST_IOS::openmode which, mpl::true_ )
+{ ndnboost::iostreams::seek(flt, dev, off, NDNBOOST_IOS::cur, which); }
+
+template<typename Filter, typename Device>
+void skip( Filter& flt, Device& dev, stream_offset off,
+ NDNBOOST_IOS::openmode, mpl::false_ )
+{
+ typedef typename char_type_of<Device>::type char_type;
+ char_type c;
+ for (stream_offset z = 0; z < off; ) {
+ std::streamsize amt;
+ if ((amt = iostreams::read(flt, dev, &c, 1)) == -1)
+ ndnboost::throw_exception(NDNBOOST_IOSTREAMS_FAILURE("bad skip offset"));
+ if (amt == 1)
+ ++z;
+ }
+}
+
+} // End namespace detail.
+
+template<typename Device>
+void skip(Device& dev, stream_offset off)
+{
+ typedef typename mode_of<Device>::type mode;
+ typedef mpl::or_<
+ is_convertible<mode, input_seekable>,
+ is_convertible<mode, output_seekable>
+ > can_seek;
+ NDNBOOST_STATIC_ASSERT(
+ (can_seek::value || is_convertible<mode, input>::value)
+ );
+ detail::skip(dev, off, can_seek());
+}
+
+template<typename Filter, typename Device>
+void skip( Filter& flt, Device& dev, stream_offset off,
+ NDNBOOST_IOS::openmode which = NDNBOOST_IOS::in | NDNBOOST_IOS::out )
+{
+ typedef typename mode_of<Filter>::type filter_mode;
+ typedef typename mode_of<Device>::type device_mode;
+ typedef mpl::or_<
+ mpl::and_<
+ is_convertible<filter_mode, input_seekable>,
+ is_convertible<device_mode, input_seekable>
+ >,
+ mpl::and_<
+ is_convertible<filter_mode, output_seekable>,
+ is_convertible<device_mode, output_seekable>
+ >
+ > can_seek;
+ NDNBOOST_STATIC_ASSERT(
+ ( can_seek::value ||
+ (is_convertible<filter_mode, input>::value &&
+ is_convertible<device_mode, input>::value) )
+ );
+ detail::skip(flt, dev, off, which, can_seek());
+}
+
+} } // End namespaces iostreams, boost.
+
+#endif // #ifndef NDNBOOST_IOSTREAMS_SKIP_HPP_INCLUDED //------------------------//