337 lines
9.9 KiB
C++
337 lines
9.9 KiB
C++
// Locale support (codecvt) -*- C++ -*-
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// Copyright (C) 2000, 2001 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 2, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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// USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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//
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// ISO C++ 14882: 22.2.1.5 Template class codecvt
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//
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// Written by Benjamin Kosnik <bkoz@cygnus.com>
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/** @file codecvt.h
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* This is an internal header file, included by other library headers.
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* You should not attempt to use it directly.
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*/
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#ifndef _CPP_BITS_CODECVT_H
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#define _CPP_BITS_CODECVT_H 1
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#pragma GCC system_header
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// 22.2.1.5 Template class codecvt
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class codecvt_base
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{
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public:
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enum result
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{
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ok,
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partial,
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error,
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noconv
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};
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};
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// Template class __codecvt_abstract_base
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// NB: An abstract base class that fills in the public inlines, so
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// that the specializations don't have to re-copy the public
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// interface.
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template<typename _InternT, typename _ExternT, typename _StateT>
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class __codecvt_abstract_base
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: public locale::facet, public codecvt_base
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{
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public:
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// Types:
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typedef codecvt_base::result result;
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typedef _InternT intern_type;
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typedef _ExternT extern_type;
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typedef _StateT state_type;
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// 22.2.1.5.1 codecvt members
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result
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out(state_type& __state, const intern_type* __from,
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const intern_type* __from_end, const intern_type*& __from_next,
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extern_type* __to, extern_type* __to_end,
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extern_type*& __to_next) const
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{
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return this->do_out(__state, __from, __from_end, __from_next,
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__to, __to_end, __to_next);
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}
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result
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unshift(state_type& __state, extern_type* __to, extern_type* __to_end,
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extern_type*& __to_next) const
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{ return this->do_unshift(__state, __to,__to_end,__to_next); }
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result
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in(state_type& __state, const extern_type* __from,
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const extern_type* __from_end, const extern_type*& __from_next,
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intern_type* __to, intern_type* __to_end,
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intern_type*& __to_next) const
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{
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return this->do_in(__state, __from, __from_end, __from_next,
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__to, __to_end, __to_next);
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}
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int
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encoding() const throw()
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{ return this->do_encoding(); }
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bool
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always_noconv() const throw()
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{ return this->do_always_noconv(); }
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int
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length(const state_type& __state, const extern_type* __from,
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const extern_type* __end, size_t __max) const
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{ return this->do_length(__state, __from, __end, __max); }
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int
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max_length() const throw()
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{ return this->do_max_length(); }
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protected:
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explicit
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__codecvt_abstract_base(size_t __refs = 0) : locale::facet(__refs) { }
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virtual
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~__codecvt_abstract_base() { }
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virtual result
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do_out(state_type& __state, const intern_type* __from,
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const intern_type* __from_end, const intern_type*& __from_next,
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extern_type* __to, extern_type* __to_end,
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extern_type*& __to_next) const = 0;
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virtual result
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do_unshift(state_type& __state, extern_type* __to,
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extern_type* __to_end, extern_type*& __to_next) const = 0;
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virtual result
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do_in(state_type& __state, const extern_type* __from,
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const extern_type* __from_end, const extern_type*& __from_next,
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intern_type* __to, intern_type* __to_end,
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intern_type*& __to_next) const = 0;
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virtual int
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do_encoding() const throw() = 0;
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virtual bool
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do_always_noconv() const throw() = 0;
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virtual int
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do_length(const state_type&, const extern_type* __from,
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const extern_type* __end, size_t __max) const = 0;
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virtual int
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do_max_length() const throw() = 0;
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};
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// 22.2.1.5 Template class codecvt
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// NB: Generic, mostly useless implementation.
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template<typename _InternT, typename _ExternT, typename _StateT>
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class codecvt
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: public __codecvt_abstract_base<_InternT, _ExternT, _StateT>
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{
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public:
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// Types:
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typedef codecvt_base::result result;
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typedef _InternT intern_type;
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typedef _ExternT extern_type;
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typedef _StateT state_type;
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// Data Members:
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static locale::id id;
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explicit
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codecvt(size_t __refs = 0)
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: __codecvt_abstract_base<_InternT,_ExternT,_StateT> (__refs) { }
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protected:
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virtual
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~codecvt() { }
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virtual result
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do_out(state_type& __state, const intern_type* __from,
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const intern_type* __from_end, const intern_type*& __from_next,
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extern_type* __to, extern_type* __to_end,
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extern_type*& __to_next) const;
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virtual result
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do_unshift(state_type& __state, extern_type* __to,
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extern_type* __to_end, extern_type*& __to_next) const;
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virtual result
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do_in(state_type& __state, const extern_type* __from,
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const extern_type* __from_end, const extern_type*& __from_next,
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intern_type* __to, intern_type* __to_end,
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intern_type*& __to_next) const;
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virtual int
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do_encoding() const throw();
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virtual bool
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do_always_noconv() const throw();
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virtual int
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do_length(const state_type&, const extern_type* __from,
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const extern_type* __end, size_t __max) const;
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virtual int
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do_max_length() const throw();
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};
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template<typename _InternT, typename _ExternT, typename _StateT>
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locale::id codecvt<_InternT, _ExternT, _StateT>::id;
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// codecvt<char, char, mbstate_t> required specialization
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template<>
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class codecvt<char, char, mbstate_t>
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: public __codecvt_abstract_base<char, char, mbstate_t>
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{
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public:
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// Types:
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typedef char intern_type;
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typedef char extern_type;
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typedef mbstate_t state_type;
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// Data Members:
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static locale::id id;
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explicit
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codecvt(size_t __refs = 0);
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protected:
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virtual
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~codecvt();
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virtual result
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do_out(state_type& __state, const intern_type* __from,
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const intern_type* __from_end, const intern_type*& __from_next,
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extern_type* __to, extern_type* __to_end,
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extern_type*& __to_next) const;
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virtual result
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do_unshift(state_type& __state, extern_type* __to,
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extern_type* __to_end, extern_type*& __to_next) const;
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virtual result
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do_in(state_type& __state, const extern_type* __from,
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const extern_type* __from_end, const extern_type*& __from_next,
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intern_type* __to, intern_type* __to_end,
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intern_type*& __to_next) const;
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virtual int
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do_encoding() const throw();
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virtual bool
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do_always_noconv() const throw();
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virtual int
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do_length(const state_type&, const extern_type* __from,
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const extern_type* __end, size_t __max) const;
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virtual int
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do_max_length() const throw();
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};
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#ifdef _GLIBCPP_USE_WCHAR_T
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// codecvt<wchar_t, char, mbstate_t> required specialization
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template<>
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class codecvt<wchar_t, char, mbstate_t>
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: public __codecvt_abstract_base<wchar_t, char, mbstate_t>
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{
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public:
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// Types:
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typedef wchar_t intern_type;
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typedef char extern_type;
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typedef mbstate_t state_type;
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// Data Members:
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static locale::id id;
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explicit
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codecvt(size_t __refs = 0);
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protected:
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virtual
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~codecvt();
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virtual result
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do_out(state_type& __state, const intern_type* __from,
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const intern_type* __from_end, const intern_type*& __from_next,
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extern_type* __to, extern_type* __to_end,
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extern_type*& __to_next) const;
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virtual result
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do_unshift(state_type& __state,
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extern_type* __to, extern_type* __to_end,
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extern_type*& __to_next) const;
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virtual result
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do_in(state_type& __state,
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const extern_type* __from, const extern_type* __from_end,
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const extern_type*& __from_next,
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intern_type* __to, intern_type* __to_end,
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intern_type*& __to_next) const;
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virtual
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int do_encoding() const throw();
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virtual
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bool do_always_noconv() const throw();
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virtual
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int do_length(const state_type&, const extern_type* __from,
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const extern_type* __end, size_t __max) const;
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virtual int
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do_max_length() const throw();
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};
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#endif //_GLIBCPP_USE_WCHAR_T
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// 22.2.1.6 Template class codecvt_byname
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template<typename _InternT, typename _ExternT, typename _StateT>
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class codecvt_byname : public codecvt<_InternT, _ExternT, _StateT>
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{
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public:
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explicit
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codecvt_byname(const char*, size_t __refs = 0)
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: codecvt<_InternT, _ExternT, _StateT>(__refs) { }
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protected:
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virtual
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~codecvt_byname() { }
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};
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// Include host and configuration specific partial specializations
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// with additional functionality, if possible.
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#ifdef _GLIBCPP_USE_WCHAR_T
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#include <bits/codecvt_specializations.h>
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#endif
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#endif // _CPP_BITS_CODECVT_H
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