138 lines
3.8 KiB
Plaintext
138 lines
3.8 KiB
Plaintext
#ifndef BOOST_ARCHIVE_ITERATORS_MB_FROM_WCHAR_HPP
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#define BOOST_ARCHIVE_ITERATORS_MB_FROM_WCHAR_HPP
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// MS compatible compilers support #pragma once
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#if defined(_MSC_VER)
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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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// mb_from_wchar.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 <cstddef> // size_t
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#include <cwchar> // mbstate_t
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#include <boost/config.hpp>
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#if defined(BOOST_NO_STDC_NAMESPACE)
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namespace std{
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using ::mbstate_t;
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} // namespace std
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#endif
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#include <boost/archive/detail/utf8_codecvt_facet.hpp>
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#include <boost/iterator/iterator_adaptor.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 wide strings and to char
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// strings of the currently selected locale
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template<class Base> // the input iterator
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class mb_from_wchar
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: public boost::iterator_adaptor<
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mb_from_wchar<Base>,
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Base,
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wchar_t,
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single_pass_traversal_tag,
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char
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>
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{
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friend class boost::iterator_core_access;
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typedef typename boost::iterator_adaptor<
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mb_from_wchar<Base>,
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Base,
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wchar_t,
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single_pass_traversal_tag,
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char
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> super_t;
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typedef mb_from_wchar<Base> this_t;
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char dereference_impl() {
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if(! m_full){
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fill();
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m_full = true;
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}
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return m_buffer[m_bnext];
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}
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char dereference() const {
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return (const_cast<this_t *>(this))->dereference_impl();
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}
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// test for iterator equality
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bool equal(const mb_from_wchar<Base> & rhs) const {
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// once the value is filled, the base_reference has been incremented
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// so don't permit comparison anymore.
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return
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0 == m_bend
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&& 0 == m_bnext
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&& this->base_reference() == rhs.base_reference()
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;
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}
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void fill(){
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wchar_t value = * this->base_reference();
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const wchar_t *wend;
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char *bend;
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std::codecvt_base::result r = m_codecvt_facet.out(
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m_mbs,
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& value, & value + 1, wend,
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m_buffer, m_buffer + sizeof(m_buffer), bend
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);
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BOOST_ASSERT(std::codecvt_base::ok == r);
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m_bnext = 0;
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m_bend = bend - m_buffer;
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}
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void increment(){
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if(++m_bnext < m_bend)
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return;
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m_bend =
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m_bnext = 0;
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++(this->base_reference());
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m_full = false;
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}
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boost::archive::detail::utf8_codecvt_facet m_codecvt_facet;
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std::mbstate_t m_mbs;
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// buffer to handle pending characters
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char m_buffer[9 /* MB_CUR_MAX */];
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std::size_t m_bend;
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std::size_t m_bnext;
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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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mb_from_wchar(T start) :
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super_t(Base(static_cast< T >(start))),
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m_mbs(std::mbstate_t()),
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m_bend(0),
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m_bnext(0),
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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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mb_from_wchar(const mb_from_wchar & rhs) :
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super_t(rhs.base_reference()),
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m_bend(rhs.m_bend),
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m_bnext(rhs.m_bnext),
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m_full(rhs.m_full)
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{}
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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_MB_FROM_WCHAR_HPP
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