215 lines
7.3 KiB
C++
215 lines
7.3 KiB
C++
// (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 the definition of the template codecvt_helper, useful for
|
|
// defining specializations of std::codecvt where state_type != mbstate_t.
|
|
// Compensates for the fact that some standard library implementations
|
|
// do not derive the primiary codecvt template from locale::facet or
|
|
// provide the correct member types and functions.
|
|
|
|
// Usage:
|
|
//
|
|
// // In global namespace:
|
|
// BOOST_IOSTREAMS_CODECVT_SPEC(mystate)
|
|
//
|
|
// // In user namespace:
|
|
// template<typename Intern, typename Extern>
|
|
// struct mycodecvt : codecvt_helper<Intern, Extern, State> { ... };
|
|
//
|
|
// // Or:
|
|
// struct mycodecvt : codecvt_helper<wchar_t, char, State> { ... };
|
|
//
|
|
// Etc.
|
|
|
|
#ifndef BOOST_IOSTREAMS_DETAIL_CODECVT_HELPER_HPP_INCLUDED
|
|
#define BOOST_IOSTREAMS_DETAIL_CODECVT_HELPER_HPP_INCLUDED
|
|
|
|
#if defined(_MSC_VER)
|
|
# pragma once
|
|
#endif
|
|
|
|
#include <boost/config.hpp> // Put size_t in std, BOOST_MSVC, Dinkum.
|
|
#include <boost/detail/workaround.hpp>
|
|
#include <algorithm> // min.
|
|
#include <cstddef> // size_t.
|
|
#include <locale> // locale, codecvt_base, codecvt.
|
|
#include <boost/iostreams/detail/config/codecvt.hpp>
|
|
|
|
//------------------Definition of traits--------------------------------------//
|
|
|
|
namespace boost { namespace iostreams { namespace detail {
|
|
|
|
#if !BOOST_WORKAROUND(BOOST_DINKUMWARE_STDLIB, == 1) //-----------------------//
|
|
|
|
template<typename T>
|
|
struct codecvt_intern { typedef typename T::intern_type type; };
|
|
|
|
template<typename T>
|
|
struct codecvt_extern { typedef typename T::extern_type type; };
|
|
|
|
#else // #if !BOOST_WORKAROUND(BOOST_DINKUMWARE_STDLIB, == 1) //--------------//
|
|
|
|
template<typename T>
|
|
struct codecvt_intern { typedef typename T::from_type type; };
|
|
|
|
template<typename T>
|
|
struct codecvt_extern { typedef typename T::to_type type; };
|
|
|
|
#endif // #if !BOOST_WORKAROUND(BOOST_DINKUMWARE_STDLIB, == 1) //-------------//
|
|
|
|
template<typename T>
|
|
struct codecvt_state { typedef typename T::state_type type; };
|
|
|
|
} } } // End namespaces detail, iostreams, boost.
|
|
|
|
//------------------Definition of codecvt_impl--------------------------------//
|
|
|
|
#if defined(BOOST_IOSTREAMS_NO_PRIMARY_CODECVT_DEFINITION) || \
|
|
defined(BOOST_IOSTREAMS_EMPTY_PRIMARY_CODECVT_DEFINITION) || \
|
|
defined(BOOST_IOSTREAMS_NO_LOCALE) \
|
|
/**/
|
|
|
|
namespace boost { namespace iostreams { namespace detail {
|
|
|
|
template<typename Intern, typename Extern, typename State>
|
|
struct codecvt_impl : std::locale::facet, std::codecvt_base {
|
|
public:
|
|
typedef Intern intern_type;
|
|
typedef Extern extern_type;
|
|
typedef State state_type;
|
|
|
|
codecvt_impl(std::size_t refs = 0) : std::locale::facet(refs) { }
|
|
|
|
std::codecvt_base::result
|
|
in( State& state, const Extern* first1, const Extern* last1,
|
|
const Extern*& next1, Intern* first2, Intern* last2,
|
|
Intern*& next2 ) const
|
|
{
|
|
return do_in(state, first1, last1, next1, first2, last2, next2);
|
|
}
|
|
|
|
std::codecvt_base::result
|
|
out( State& state, const Intern* first1, const Intern* last1,
|
|
const Intern*& next1, Extern* first2, Extern* last2,
|
|
Extern*& next2 ) const
|
|
{
|
|
return do_out(state, first1, last1, next1, first2, last2, next2);
|
|
}
|
|
|
|
std::codecvt_base::result
|
|
unshift(State& state, Extern* first2, Extern* last2, Extern*& next2) const
|
|
{
|
|
return do_unshift(state, first2, last2, next2);
|
|
}
|
|
|
|
bool always_noconv() const throw() { return do_always_noconv(); }
|
|
|
|
int max_length() const throw() { return do_max_length(); }
|
|
|
|
int encoding() const throw() { return do_encoding(); }
|
|
|
|
int length( BOOST_IOSTREAMS_CODECVT_CV_QUALIFIER State& state,
|
|
const Extern* first1, const Extern* last1,
|
|
std::size_t len2 ) const throw()
|
|
{
|
|
return do_length(state, first1, last1, len2);
|
|
}
|
|
protected:
|
|
std::codecvt_base::result
|
|
virtual do_in( State&, const Extern*, const Extern*, const Extern*&,
|
|
Intern*, Intern*, Intern*& ) const
|
|
{
|
|
return std::codecvt_base::noconv;
|
|
}
|
|
|
|
std::codecvt_base::result
|
|
virtual do_out( State&, const Intern*, const Intern*, const Intern*&,
|
|
Extern*, Extern*, Extern*& ) const
|
|
{
|
|
return std::codecvt_base::noconv;
|
|
}
|
|
|
|
std::codecvt_base::result
|
|
virtual do_unshift(State&, Extern*, Extern*, Extern*&) const
|
|
{
|
|
return std::codecvt_base::ok;
|
|
}
|
|
|
|
virtual bool do_always_noconv() const throw() { return true; }
|
|
|
|
virtual int do_max_length() const throw() { return 1; }
|
|
|
|
virtual int do_encoding() const throw() { return 1; }
|
|
|
|
virtual int do_length( BOOST_IOSTREAMS_CODECVT_CV_QUALIFIER State&,
|
|
const Extern* first1, const Extern* last1,
|
|
std::size_t len2 ) const throw()
|
|
{
|
|
return (std::min)(static_cast<std::size_t>(last1 - first1), len2);
|
|
}
|
|
};
|
|
|
|
} } } // End namespaces detail, iostreams, boost.
|
|
|
|
#endif // no primary codecvt definition, empty definition.
|
|
|
|
//------------------Definition of BOOST_IOSTREAMS_CODECVT_SPEC----------------//
|
|
|
|
#if defined(BOOST_IOSTREAMS_NO_PRIMARY_CODECVT_DEFINITION) || \
|
|
defined(BOOST_IOSTREAMS_EMPTY_PRIMARY_CODECVT_DEFINITION) \
|
|
/**/
|
|
# define BOOST_IOSTREAMS_CODECVT_SPEC(state) \
|
|
namespace std { \
|
|
template<typename Intern, typename Extern> \
|
|
class codecvt<Intern, Extern, state> \
|
|
: public ::boost::iostreams::detail::codecvt_impl< \
|
|
Intern, Extern, state \
|
|
> \
|
|
{ \
|
|
public: \
|
|
codecvt(std::size_t refs = 0) \
|
|
: ::boost::iostreams::detail::codecvt_impl< \
|
|
Intern, Extern, state \
|
|
>(refs) \
|
|
{ } \
|
|
static std::locale::id id; \
|
|
}; \
|
|
template<typename Intern, typename Extern> \
|
|
std::locale::id codecvt<Intern, Extern, state>::id; \
|
|
} \
|
|
/**/
|
|
#else
|
|
# define BOOST_IOSTREAMS_CODECVT_SPEC(state)
|
|
#endif // no primary codecvt definition, or empty definition.
|
|
|
|
namespace boost { namespace iostreams { namespace detail {
|
|
|
|
//------------------Definition of codecvt_helper------------------------------//
|
|
|
|
template<typename Intern, typename Extern, typename State>
|
|
struct codecvt_helper : std::codecvt<Intern, Extern, State> {
|
|
typedef Intern intern_type;
|
|
typedef Extern extern_type;
|
|
typedef State state_type;
|
|
codecvt_helper(std::size_t refs = 0)
|
|
#if !defined(BOOST_IOSTREAMS_NO_CODECVT_CTOR_FROM_SIZE_T)
|
|
: std::codecvt<Intern, Extern, State>(refs)
|
|
#else
|
|
: std::codecvt<Intern, Extern, State>()
|
|
#endif
|
|
{ }
|
|
#ifdef BOOST_IOSTREAMS_NO_CODECVT_MAX_LENGTH
|
|
int max_length() const throw() { return do_max_length(); }
|
|
protected:
|
|
virtual int do_max_length() const throw() { return 1; }
|
|
#endif
|
|
};
|
|
|
|
} } } // End namespaces detail, iostreams, boost.
|
|
|
|
#endif // #ifndef BOOST_IOSTREAMS_DETAIL_CODECVT_HELPER_HPP_INCLUDED
|