Chris@16: // (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
Chris@16: // (C) Copyright 2003-2007 Jonathan Turkanis
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See accompanying
Chris@16: // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
Chris@16: 
Chris@16: // See http://www.boost.org/libs/iostreams for documentation.
Chris@16: 
Chris@16: // Contains the definition of the template codecvt_helper, useful for
Chris@16: // defining specializations of std::codecvt where state_type != mbstate_t.
Chris@16: // Compensates for the fact that some standard library implementations 
Chris@16: // do not derive the primiary codecvt template from locale::facet or 
Chris@16: // provide the correct member types and functions.
Chris@16: 
Chris@16: // Usage: 
Chris@16: //
Chris@16: // // In global namespace:
Chris@16: // BOOST_IOSTREAMS_CODECVT_SPEC(mystate)
Chris@16: //
Chris@16: // // In user namespace:
Chris@16: // template<typename Intern, typename Extern>
Chris@16: // struct mycodecvt : codecvt_helper<Intern, Extern, State> { ... };
Chris@16: //
Chris@16: // // Or:
Chris@16: // struct mycodecvt : codecvt_helper<wchar_t, char, State> { ... };
Chris@16: // 
Chris@16: // Etc.
Chris@16: 
Chris@16: #ifndef BOOST_IOSTREAMS_DETAIL_CODECVT_HELPER_HPP_INCLUDED
Chris@16: #define BOOST_IOSTREAMS_DETAIL_CODECVT_HELPER_HPP_INCLUDED
Chris@16: 
Chris@16: #if defined(_MSC_VER) && (_MSC_VER >= 1020)
Chris@16: # pragma once
Chris@16: #endif
Chris@16: 
Chris@16: #include <boost/config.hpp>  // Put size_t in std, BOOST_MSVC, Dinkum.
Chris@16: #include <boost/detail/workaround.hpp>
Chris@16: #include <algorithm>         // min.
Chris@16: #include <cstddef>           // size_t.
Chris@16: #include <locale>            // locale, codecvt_base, codecvt.
Chris@16: #include <boost/iostreams/detail/config/codecvt.hpp>
Chris@16: 
Chris@16: //------------------Definition of traits--------------------------------------//
Chris@16: 
Chris@16: namespace boost { namespace iostreams { namespace detail {
Chris@16: 
Chris@16: #if !BOOST_WORKAROUND(BOOST_DINKUMWARE_STDLIB, == 1) //-----------------------//
Chris@16: 
Chris@16: template<typename T>
Chris@16: struct codecvt_intern { typedef typename T::intern_type type; };
Chris@16: 
Chris@16: template<typename T>
Chris@16: struct codecvt_extern { typedef typename T::extern_type type; };
Chris@16: 
Chris@16: #else // #if !BOOST_WORKAROUND(BOOST_DINKUMWARE_STDLIB, == 1) //--------------//
Chris@16: 
Chris@16: template<typename T>
Chris@16: struct codecvt_intern { typedef typename T::from_type type; };
Chris@16: 
Chris@16: template<typename T>
Chris@16: struct codecvt_extern { typedef typename T::to_type type; };
Chris@16: 
Chris@16: #endif // #if !BOOST_WORKAROUND(BOOST_DINKUMWARE_STDLIB, == 1) //-------------//
Chris@16: 
Chris@16: template<typename T>
Chris@16: struct codecvt_state { typedef typename T::state_type type; };
Chris@16: 
Chris@16: } } } // End namespaces detail, iostreams, boost.
Chris@16: 
Chris@16: //------------------Definition of codecvt_impl--------------------------------//
Chris@16: 
Chris@16: #if defined(BOOST_IOSTREAMS_NO_PRIMARY_CODECVT_DEFINITION) || \
Chris@16:     defined(BOOST_IOSTREAMS_EMPTY_PRIMARY_CODECVT_DEFINITION) || \
Chris@16:     defined(BOOST_IOSTREAMS_NO_LOCALE) \
Chris@16:     /**/
Chris@16: 
Chris@16: namespace boost { namespace iostreams { namespace detail {
Chris@16: 
Chris@16: template<typename Intern, typename Extern, typename State>
Chris@16: struct codecvt_impl : std::locale::facet, std::codecvt_base {
Chris@16: public:
Chris@16:     typedef Intern  intern_type;
Chris@16:     typedef Extern  extern_type;
Chris@16:     typedef State   state_type;
Chris@16: 
Chris@16:     codecvt_impl(std::size_t refs = 0) : std::locale::facet(refs) { } 
Chris@16: 
Chris@16:     std::codecvt_base::result
Chris@16:     in( State& state, const Extern* first1, const Extern* last1,
Chris@16:         const Extern*& next1, Intern* first2, Intern* last2,
Chris@16:         Intern*& next2 ) const
Chris@16:     {
Chris@16:         return do_in(state, first1, last1, next1, first2, last2, next2);
Chris@16:     }
Chris@16: 
Chris@16:     std::codecvt_base::result
Chris@16:     out( State& state, const Intern* first1, const Intern* last1,
Chris@16:          const Intern*& next1, Extern* first2, Extern* last2,
Chris@16:          Extern*& next2 ) const
Chris@16:     {
Chris@16:         return do_out(state, first1, last1, next1, first2, last2, next2);
Chris@16:     }
Chris@16: 
Chris@16:     std::codecvt_base::result
Chris@16:     unshift(State& state, Extern* first2, Extern* last2, Extern*& next2) const
Chris@16:     {
Chris@16:         return do_unshift(state, first2, last2, next2);
Chris@16:     }
Chris@16: 
Chris@16:     bool always_noconv() const throw() { return do_always_noconv(); }
Chris@16: 
Chris@16:     int max_length() const throw() { return do_max_length(); }
Chris@16: 
Chris@16:     int encoding() const throw() { return do_encoding(); }
Chris@16: 
Chris@16:     int length( BOOST_IOSTREAMS_CODECVT_CV_QUALIFIER State& state, 
Chris@16:                 const Extern* first1, const Extern* last1,
Chris@16:                 std::size_t len2 ) const throw()
Chris@16:     {
Chris@16:         return do_length(state, first1, last1, len2);
Chris@16:     }
Chris@16: protected:
Chris@16:     std::codecvt_base::result
Chris@16:     virtual do_in( State&, const Extern*, const Extern*, const Extern*&, 
Chris@16:                    Intern*, Intern*, Intern*& ) const
Chris@16:     {
Chris@16:         return std::codecvt_base::noconv;
Chris@16:     }
Chris@16: 
Chris@16:     std::codecvt_base::result
Chris@16:     virtual do_out( State&, const Intern*, const Intern*, const Intern*&, 
Chris@16:                     Extern*, Extern*, Extern*& ) const
Chris@16:     {
Chris@16:         return std::codecvt_base::noconv;
Chris@16:     }
Chris@16: 
Chris@16:     std::codecvt_base::result
Chris@16:     virtual do_unshift(State&, Extern*, Extern*, Extern*&) const
Chris@16:     {
Chris@16:         return std::codecvt_base::ok;
Chris@16:     }
Chris@16: 
Chris@16:     virtual bool do_always_noconv() const throw() { return true; }
Chris@16: 
Chris@16:     virtual int do_max_length() const throw() { return 1; }
Chris@16: 
Chris@16:     virtual int do_encoding() const throw() { return 1; }
Chris@16: 
Chris@16:     virtual int do_length( BOOST_IOSTREAMS_CODECVT_CV_QUALIFIER State&, 
Chris@16:                            const Extern* first1, const Extern* last1,
Chris@16:                            std::size_t len2 ) const throw()
Chris@16:     {
Chris@16:         return (std::min)(static_cast<std::size_t>(last1 - first1), len2);
Chris@16:     }
Chris@16: };
Chris@16: 
Chris@16: } } } // End namespaces detail, iostreams, boost.
Chris@16: 
Chris@16: #endif // no primary codecvt definition, empty definition.
Chris@16: 
Chris@16: //------------------Definition of BOOST_IOSTREAMS_CODECVT_SPEC----------------//
Chris@16: 
Chris@16: #if defined(BOOST_IOSTREAMS_NO_PRIMARY_CODECVT_DEFINITION) || \
Chris@16:     defined(BOOST_IOSTREAMS_EMPTY_PRIMARY_CODECVT_DEFINITION) \
Chris@16:     /**/
Chris@16: # ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
Chris@16: #  define BOOST_IOSTREAMS_CODECVT_SPEC(state) \
Chris@16:     namespace std { \
Chris@16:         template<typename Intern, typename Extern> \
Chris@16:         class codecvt<Intern, Extern, state> \
Chris@16:             : public ::boost::iostreams::detail::codecvt_impl< \
Chris@16:                          Intern, Extern, state \
Chris@16:                      > \
Chris@16:         { \
Chris@16:         public: \
Chris@16:             codecvt(std::size_t refs = 0) \
Chris@16:                 : ::boost::iostreams::detail::codecvt_impl< \
Chris@16:                       Intern, Extern, state \
Chris@16:                   >(refs) \
Chris@16:                 { } \
Chris@16:             static std::locale::id id; \
Chris@16:         }; \
Chris@16:         template<typename Intern, typename Extern> \
Chris@16:         std::locale::id codecvt<Intern, Extern, state>::id; \
Chris@16:     } \
Chris@16:     /**/
Chris@16: # else
Chris@16: #  define BOOST_IOSTREAMS_CODECVT_SPEC(state) \
Chris@16:     namespace std { \
Chris@16:         template<> \
Chris@16:         class codecvt<wchar_t, char, state> \
Chris@16:             : public ::boost::iostreams::detail::codecvt_impl< \
Chris@16:                          wchar_t, char, state \
Chris@16:                      > \
Chris@16:         { \
Chris@16:         public: \
Chris@16:             codecvt(std::size_t refs = 0) \
Chris@16:                 : ::boost::iostreams::detail::codecvt_impl< \
Chris@16:                       wchar_t, char, state \
Chris@16:                   >(refs) \
Chris@16:                 { } \
Chris@16:             static std::locale::id id; \
Chris@16:         }; \
Chris@16:         template<> \
Chris@16:         std::locale::id codecvt<wchar_t, char, state>::id; \
Chris@16:     } \
Chris@16:     /**/
Chris@16: # endif
Chris@16: #else
Chris@16: # define BOOST_IOSTREAMS_CODECVT_SPEC(state)
Chris@16: #endif // no primary codecvt definition, or empty definition.
Chris@16: 
Chris@16: namespace boost { namespace iostreams { namespace detail {
Chris@16:                     
Chris@16: //------------------Definition of codecvt_helper------------------------------//
Chris@16: 
Chris@16: template<typename Intern, typename Extern, typename State>
Chris@16: struct codecvt_helper : std::codecvt<Intern, Extern, State> { 
Chris@16:     typedef Intern  intern_type;
Chris@16:     typedef Extern  extern_type;
Chris@16:     typedef State   state_type;
Chris@16:     codecvt_helper(std::size_t refs = 0) 
Chris@16:     #if !defined(BOOST_IOSTREAMS_NO_CODECVT_CTOR_FROM_SIZE_T)
Chris@16:         : std::codecvt<Intern, Extern, State>(refs)
Chris@16:     #else
Chris@16:         : std::codecvt<Intern, Extern, State>()
Chris@16:     #endif
Chris@16:         { }
Chris@16: #ifdef BOOST_IOSTREAMS_NO_CODECVT_MAX_LENGTH
Chris@16:     int max_length() const throw() { return do_max_length(); }
Chris@16: protected:
Chris@16:     virtual int do_max_length() const throw() { return 1; }
Chris@16: #endif
Chris@16: };
Chris@16: 
Chris@16: } } } // End namespaces detail, iostreams, boost.
Chris@16: 
Chris@16: #endif // #ifndef BOOST_IOSTREAMS_DETAIL_CODECVT_HELPER_HPP_INCLUDED