70 lines
1.8 KiB
C++
70 lines
1.8 KiB
C++
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//
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// Copyright (c) 2015 Artyom Beilis (Tonkikh)
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef BOOST_LOCALE_UTF8_CODECVT_HPP
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#define BOOST_LOCALE_UTF8_CODECVT_HPP
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#include <boost/locale/utf.hpp>
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#include <boost/locale/generic_codecvt.hpp>
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#include <boost/cstdint.hpp>
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#include <locale>
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namespace boost {
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namespace locale {
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///
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/// \brief Geneneric utf8 codecvt facet, it allows to convert UTF-8 strings to UTF-16 and UTF-32 using wchar_t, char32_t and char16_t
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///
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template<typename CharType>
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class utf8_codecvt : public generic_codecvt<CharType,utf8_codecvt<CharType> >
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{
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public:
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struct state_type {};
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utf8_codecvt(size_t refs = 0) : generic_codecvt<CharType,utf8_codecvt<CharType> >(refs)
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{
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}
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static int max_encoding_length()
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{
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return 4;
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}
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static state_type initial_state(generic_codecvt_base::initial_convertion_state /* unused */)
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{
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return state_type();
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}
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static utf::code_point to_unicode(state_type &,char const *&begin,char const *end)
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{
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char const *p=begin;
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utf::code_point c = utf::utf_traits<char>::decode(p,end);
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if(c!=utf::illegal && c!=utf::incomplete)
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begin = p;
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return c;
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}
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static utf::code_point from_unicode(state_type &,utf::code_point u,char *begin,char const *end)
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{
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if(!utf::is_valid_codepoint(u))
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return utf::illegal;
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int width;
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if((width=utf::utf_traits<char>::width(u)) > end - begin)
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return utf::incomplete;
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utf::utf_traits<char>::encode(u,begin);
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return width;
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}
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};
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} // locale
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} // namespace boost
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#endif
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///
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// vim: tabstop=4 expandtab shiftwidth=4 softtabstop=4
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