130 lines
3.4 KiB
C++
130 lines
3.4 KiB
C++
#ifndef BOOST_ARCHIVE_ITERATORS_WCHAR_FROM_MB_HPP
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#define BOOST_ARCHIVE_ITERATORS_WCHAR_FROM_MB_HPP
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// MS compatible compilers support #pragma once
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#if defined(_MSC_VER) && (_MSC_VER >= 1020)
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# pragma once
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#endif
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/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
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// wchar_from_mb.hpp
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// (C) Copyright 2002 Robert Ramey - http://www.rrsd.com .
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// Use, modification and distribution is subject to the Boost Software
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// License, Version 1.0. (See 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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// See http://www.boost.org for updates, documentation, and revision history.
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#include <boost/assert.hpp>
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#include <cctype>
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#include <cstddef> // size_t
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#include <cstdlib> // mblen
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#include <boost/config.hpp> // for BOOST_DEDUCED_TYPENAME
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#if defined(BOOST_NO_STDC_NAMESPACE)
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namespace std{
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using ::mblen;
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using ::mbtowc;
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} // namespace std
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#endif
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#include <boost/serialization/throw_exception.hpp>
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#include <boost/serialization/pfto.hpp>
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#include <boost/iterator/iterator_adaptor.hpp>
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#include <boost/archive/iterators/dataflow_exception.hpp>
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namespace boost {
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namespace archive {
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namespace iterators {
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/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
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// class used by text archives to translate char strings to wchar_t
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// strings of the currently selected locale
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template<class Base>
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class wchar_from_mb
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: public boost::iterator_adaptor<
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wchar_from_mb<Base>,
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Base,
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wchar_t,
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single_pass_traversal_tag,
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wchar_t
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>
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{
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friend class boost::iterator_core_access;
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typedef BOOST_DEDUCED_TYPENAME boost::iterator_adaptor<
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wchar_from_mb<Base>,
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Base,
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wchar_t,
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single_pass_traversal_tag,
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wchar_t
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> super_t;
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typedef wchar_from_mb<Base> this_t;
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wchar_t drain();
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wchar_t dereference_impl() {
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if(! m_full){
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m_current_value = drain();
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m_full = true;
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}
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return m_current_value;
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}
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wchar_t dereference() const {
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return const_cast<this_t *>(this)->dereference_impl();
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}
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void increment(){
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dereference_impl();
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m_full = false;
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++(this->base_reference());
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};
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wchar_t m_current_value;
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bool m_full;
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public:
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// make composible buy using templated constructor
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template<class T>
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wchar_from_mb(BOOST_PFTO_WRAPPER(T) start) :
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super_t(Base(BOOST_MAKE_PFTO_WRAPPER(static_cast< T >(start)))),
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m_full(false)
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{}
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// intel 7.1 doesn't like default copy constructor
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wchar_from_mb(const wchar_from_mb & rhs) :
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super_t(rhs.base_reference()),
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m_full(rhs.m_full)
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{}
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};
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template<class Base>
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wchar_t wchar_from_mb<Base>::drain(){
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char buffer[9];
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char * bptr = buffer;
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char val;
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for(std::size_t i = 0; i++ < (unsigned)MB_CUR_MAX;){
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val = * this->base_reference();
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*bptr++ = val;
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int result = std::mblen(buffer, i);
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if(-1 != result)
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break;
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++(this->base_reference());
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}
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wchar_t retval;
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int result = std::mbtowc(& retval, buffer, MB_CUR_MAX);
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if(0 >= result)
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boost::serialization::throw_exception(iterators::dataflow_exception(
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iterators::dataflow_exception::invalid_conversion
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));
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return retval;
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}
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} // namespace iterators
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} // namespace archive
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} // namespace boost
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#endif // BOOST_ARCHIVE_ITERATORS_WCHAR_FROM_MB_HPP
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