diff --git a/ndnboost/io/ios_state.hpp b/ndnboost/io/ios_state.hpp
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+++ b/ndnboost/io/ios_state.hpp
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+//  Boost io/ios_state.hpp header file  --------------------------------------//
+
+//  Copyright 2002, 2005 Daryle Walker.  Use, modification, and distribution
+//  are subject to the Boost Software License, Version 1.0.  (See accompanying
+//  file LICENSE_1_0.txt or a copy at <http://www.boost.org/LICENSE_1_0.txt>.)
+
+//  See <http://www.boost.org/libs/io/> for the library's home page.
+
+#ifndef BOOST_IO_IOS_STATE_HPP
+#define BOOST_IO_IOS_STATE_HPP
+
+#include <ndnboost/io_fwd.hpp>  // self include
+#include <ndnboost/detail/workaround.hpp>
+
+#include <ios>        // for std::ios_base, std::basic_ios, etc.
+#ifndef BOOST_NO_STD_LOCALE
+#include <locale>     // for std::locale
+#endif
+#include <ostream>    // for std::basic_ostream
+#include <streambuf>  // for std::basic_streambuf
+#include <string>     // for std::char_traits
+
+
+namespace ndnboost
+{
+namespace io
+{
+
+
+//  Basic stream state saver class declarations  -----------------------------//
+
+class ios_flags_saver
+{
+public:
+    typedef ::std::ios_base            state_type;
+    typedef ::std::ios_base::fmtflags  aspect_type;
+
+    explicit  ios_flags_saver( state_type &s )
+        : s_save_( s ), a_save_( s.flags() )
+        {}
+    ios_flags_saver( state_type &s, aspect_type const &a )
+        : s_save_( s ), a_save_( s.flags(a) )
+        {}
+    ~ios_flags_saver()
+        { this->restore(); }
+
+    void  restore()
+        { s_save_.flags( a_save_ ); }
+
+private:
+    state_type &       s_save_;
+    aspect_type const  a_save_;
+
+    ios_flags_saver& operator=(const ios_flags_saver&);
+};
+
+class ios_precision_saver
+{
+public:
+    typedef ::std::ios_base    state_type;
+    typedef ::std::streamsize  aspect_type;
+
+    explicit  ios_precision_saver( state_type &s )
+        : s_save_( s ), a_save_( s.precision() )
+        {}
+    ios_precision_saver( state_type &s, aspect_type const &a )
+        : s_save_( s ), a_save_( s.precision(a) )
+        {}
+    ~ios_precision_saver()
+        { this->restore(); }
+
+    void  restore()
+        { s_save_.precision( a_save_ ); }
+
+private:
+    state_type &       s_save_;
+    aspect_type const  a_save_;
+
+    ios_precision_saver& operator=(const ios_precision_saver&);
+};
+
+class ios_width_saver
+{
+public:
+    typedef ::std::ios_base    state_type;
+    typedef ::std::streamsize  aspect_type;
+
+    explicit  ios_width_saver( state_type &s )
+        : s_save_( s ), a_save_( s.width() )
+        {}
+    ios_width_saver( state_type &s, aspect_type const &a )
+        : s_save_( s ), a_save_( s.width(a) )
+        {}
+    ~ios_width_saver()
+        { this->restore(); }
+
+    void  restore()
+        { s_save_.width( a_save_ ); }
+
+private:
+    state_type &       s_save_;
+    aspect_type const  a_save_;
+    ios_width_saver& operator=(const ios_width_saver&);
+};
+
+
+//  Advanced stream state saver class template declarations  -----------------//
+
+template < typename Ch, class Tr >
+class basic_ios_iostate_saver
+{
+public:
+    typedef ::std::basic_ios<Ch, Tr>  state_type;
+    typedef ::std::ios_base::iostate  aspect_type;
+
+    explicit  basic_ios_iostate_saver( state_type &s )
+        : s_save_( s ), a_save_( s.rdstate() )
+        {}
+    basic_ios_iostate_saver( state_type &s, aspect_type const &a )
+        : s_save_( s ), a_save_( s.rdstate() )
+        { s.clear(a); }
+    ~basic_ios_iostate_saver()
+        { this->restore(); }
+
+    void  restore()
+        { s_save_.clear( a_save_ ); }
+
+private:
+    state_type &       s_save_;
+    aspect_type const  a_save_;
+    basic_ios_iostate_saver& operator=(const basic_ios_iostate_saver&);
+};
+
+template < typename Ch, class Tr >
+class basic_ios_exception_saver
+{
+public:
+    typedef ::std::basic_ios<Ch, Tr>  state_type;
+    typedef ::std::ios_base::iostate  aspect_type;
+
+    explicit  basic_ios_exception_saver( state_type &s )
+        : s_save_( s ), a_save_( s.exceptions() )
+        {}
+#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x582))
+    basic_ios_exception_saver( state_type &s, aspect_type a )
+#else
+    basic_ios_exception_saver( state_type &s, aspect_type const &a )
+#endif
+        : s_save_( s ), a_save_( s.exceptions() )
+        { s.exceptions(a); }
+    ~basic_ios_exception_saver()
+        { this->restore(); }
+
+    void  restore()
+        { s_save_.exceptions( a_save_ ); }
+
+private:
+    state_type &       s_save_;
+    aspect_type const  a_save_;
+    basic_ios_exception_saver& operator=(const basic_ios_exception_saver&);
+};
+
+template < typename Ch, class Tr >
+class basic_ios_tie_saver
+{
+public:
+    typedef ::std::basic_ios<Ch, Tr>        state_type;
+    typedef ::std::basic_ostream<Ch, Tr> *  aspect_type;
+
+    explicit  basic_ios_tie_saver( state_type &s )
+        : s_save_( s ), a_save_( s.tie() )
+        {}
+    basic_ios_tie_saver( state_type &s, aspect_type const &a )
+        : s_save_( s ), a_save_( s.tie(a) )
+        {}
+    ~basic_ios_tie_saver()
+        { this->restore(); }
+
+    void  restore()
+        { s_save_.tie( a_save_ ); }
+
+private:
+    state_type &       s_save_;
+    aspect_type const  a_save_;
+    basic_ios_tie_saver& operator=(const basic_ios_tie_saver&);
+};
+
+template < typename Ch, class Tr >
+class basic_ios_rdbuf_saver
+{
+public:
+    typedef ::std::basic_ios<Ch, Tr>          state_type;
+    typedef ::std::basic_streambuf<Ch, Tr> *  aspect_type;
+
+    explicit  basic_ios_rdbuf_saver( state_type &s )
+        : s_save_( s ), a_save_( s.rdbuf() )
+        {}
+    basic_ios_rdbuf_saver( state_type &s, aspect_type const &a )
+        : s_save_( s ), a_save_( s.rdbuf(a) )
+        {}
+    ~basic_ios_rdbuf_saver()
+        { this->restore(); }
+
+    void  restore()
+        { s_save_.rdbuf( a_save_ ); }
+
+private:
+    state_type &       s_save_;
+    aspect_type const  a_save_;
+    basic_ios_rdbuf_saver& operator=(const basic_ios_rdbuf_saver&);
+};
+
+template < typename Ch, class Tr >
+class basic_ios_fill_saver
+{
+public:
+    typedef ::std::basic_ios<Ch, Tr>        state_type;
+    typedef typename state_type::char_type  aspect_type;
+
+    explicit  basic_ios_fill_saver( state_type &s )
+        : s_save_( s ), a_save_( s.fill() )
+        {}
+    basic_ios_fill_saver( state_type &s, aspect_type const &a )
+        : s_save_( s ), a_save_( s.fill(a) )
+        {}
+    ~basic_ios_fill_saver()
+        { this->restore(); }
+
+    void  restore()
+        { s_save_.fill( a_save_ ); }
+
+private:
+    state_type &       s_save_;
+    aspect_type const  a_save_;
+    basic_ios_fill_saver& operator=(const basic_ios_fill_saver&);
+};
+
+#ifndef BOOST_NO_STD_LOCALE
+template < typename Ch, class Tr >
+class basic_ios_locale_saver
+{
+public:
+    typedef ::std::basic_ios<Ch, Tr> state_type;
+    typedef ::std::locale aspect_type;
+
+    explicit basic_ios_locale_saver( state_type &s )
+        : s_save_( s ), a_save_( s.getloc() )
+        {}
+    basic_ios_locale_saver( state_type &s, aspect_type const &a )
+        : s_save_( s ), a_save_( s.imbue(a) )
+        {}
+    ~basic_ios_locale_saver()
+        { this->restore(); }
+
+    void  restore()
+        { s_save_.imbue( a_save_ ); }
+
+private:
+    state_type &       s_save_;
+    aspect_type const  a_save_;
+    basic_ios_locale_saver& operator=(const basic_ios_locale_saver&);
+};
+#endif
+
+
+//  User-defined stream state saver class declarations  ----------------------//
+
+class ios_iword_saver
+{
+public:
+    typedef ::std::ios_base  state_type;
+    typedef int              index_type;
+    typedef long             aspect_type;
+
+    explicit ios_iword_saver( state_type &s, index_type i )
+        : s_save_( s ), a_save_( s.iword(i) ), i_save_( i )
+        {}
+    ios_iword_saver( state_type &s, index_type i, aspect_type const &a )
+        : s_save_( s ), a_save_( s.iword(i) ), i_save_( i )
+        { s.iword(i) = a; }
+    ~ios_iword_saver()
+        { this->restore(); }
+
+    void  restore()
+        { s_save_.iword( i_save_ ) = a_save_; }
+
+private:
+    state_type &       s_save_;
+    aspect_type const  a_save_;
+    index_type const   i_save_;
+
+    ios_iword_saver& operator=(const ios_iword_saver&);
+};
+
+class ios_pword_saver
+{
+public:
+    typedef ::std::ios_base  state_type;
+    typedef int              index_type;
+    typedef void *           aspect_type;
+
+    explicit  ios_pword_saver( state_type &s, index_type i )
+        : s_save_( s ), a_save_( s.pword(i) ), i_save_( i )
+        {}
+    ios_pword_saver( state_type &s, index_type i, aspect_type const &a )
+        : s_save_( s ), a_save_( s.pword(i) ), i_save_( i )
+        { s.pword(i) = a; }
+    ~ios_pword_saver()
+        { this->restore(); }
+
+    void  restore()
+        { s_save_.pword( i_save_ ) = a_save_; }
+
+private:
+    state_type &       s_save_;
+    aspect_type const  a_save_;
+    index_type const   i_save_;
+
+    ios_pword_saver operator=(const ios_pword_saver&);
+};
+
+
+//  Combined stream state saver class (template) declarations  ---------------//
+
+class ios_base_all_saver
+{
+public:
+    typedef ::std::ios_base  state_type;
+
+    explicit  ios_base_all_saver( state_type &s )
+        : s_save_( s ), a1_save_( s.flags() ), a2_save_( s.precision() )
+        , a3_save_( s.width() )
+        {}
+
+    ~ios_base_all_saver()
+        { this->restore(); }
+
+    void  restore()
+    {
+        s_save_.width( a3_save_ );
+        s_save_.precision( a2_save_ );
+        s_save_.flags( a1_save_ );
+    }
+
+private:
+    state_type &                s_save_;
+    state_type::fmtflags const  a1_save_;
+    ::std::streamsize const     a2_save_;
+    ::std::streamsize const     a3_save_;
+
+    ios_base_all_saver& operator=(const ios_base_all_saver&);
+};
+
+template < typename Ch, class Tr >
+class basic_ios_all_saver
+{
+public:
+    typedef ::std::basic_ios<Ch, Tr>  state_type;
+
+    explicit  basic_ios_all_saver( state_type &s )
+        : s_save_( s ), a1_save_( s.flags() ), a2_save_( s.precision() )
+        , a3_save_( s.width() ), a4_save_( s.rdstate() )
+        , a5_save_( s.exceptions() ), a6_save_( s.tie() )
+        , a7_save_( s.rdbuf() ), a8_save_( s.fill() )
+        #ifndef BOOST_NO_STD_LOCALE
+        , a9_save_( s.getloc() )
+        #endif
+        {}
+
+    ~basic_ios_all_saver()
+        { this->restore(); }
+
+    void  restore()
+    {
+        #ifndef BOOST_NO_STD_LOCALE
+        s_save_.imbue( a9_save_ );
+        #endif
+        s_save_.fill( a8_save_ );
+        s_save_.rdbuf( a7_save_ );
+        s_save_.tie( a6_save_ );
+        s_save_.exceptions( a5_save_ );
+        s_save_.clear( a4_save_ );
+        s_save_.width( a3_save_ );
+        s_save_.precision( a2_save_ );
+        s_save_.flags( a1_save_ );
+    }
+
+private:
+    state_type &                            s_save_;
+    typename state_type::fmtflags const     a1_save_;
+    ::std::streamsize const                 a2_save_;
+    ::std::streamsize const                 a3_save_;
+    typename state_type::iostate const      a4_save_;
+    typename state_type::iostate const      a5_save_;
+    ::std::basic_ostream<Ch, Tr> * const    a6_save_;
+    ::std::basic_streambuf<Ch, Tr> * const  a7_save_;
+    typename state_type::char_type const    a8_save_;
+    #ifndef BOOST_NO_STD_LOCALE
+    ::std::locale const                     a9_save_;
+    #endif
+
+    basic_ios_all_saver& operator=(const basic_ios_all_saver&);
+};
+
+class ios_all_word_saver
+{
+public:
+    typedef ::std::ios_base  state_type;
+    typedef int              index_type;
+
+    ios_all_word_saver( state_type &s, index_type i )
+        : s_save_( s ), i_save_( i ), a1_save_( s.iword(i) )
+        , a2_save_( s.pword(i) )
+        {}
+
+    ~ios_all_word_saver()
+        { this->restore(); }
+
+    void  restore()
+    {
+        s_save_.pword( i_save_ ) = a2_save_;
+        s_save_.iword( i_save_ ) = a1_save_;
+    }
+
+private:
+    state_type &      s_save_;
+    index_type const  i_save_;
+    long const        a1_save_;
+    void * const      a2_save_;
+
+    ios_all_word_saver& operator=(const ios_all_word_saver&);
+};
+
+
+}  // namespace io
+}  // namespace ndnboost
+
+
+#endif  // BOOST_IO_IOS_STATE_HPP