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// test_codecvt.hpp ------------------------------------------------------------------//
// Copyright Beman Dawes 2009, 2010
// Distributed under the Boost Software License, Version 1.0.
// See http://www.boost.org/LICENSE_1_0.txt
// Library home page: http://www.boost.org/libs/filesystem
#ifndef BOOST_FILESYSTEM_TEST_CODECVT_HPP
#define BOOST_FILESYSTEM_TEST_CODECVT_HPP
#include <boost/filesystem/config.hpp>
#include <locale>
#include <cwchar> // for mbstate_t
//------------------------------------------------------------------------------------//
// //
// class test_codecvt //
// //
// Warning: partial implementation; even do_in and do_out only partially meet the //
// standard library specifications as the "to" buffer must hold the entire result. //
// //
// The value of a wide character is the value of the corresponding narrow character //
// plus 1. This ensures that compares against expected values will fail if the //
// code conversion did not occur as expected. //
// //
//------------------------------------------------------------------------------------//
class test_codecvt :
public std::codecvt< wchar_t, char, std::mbstate_t >
{
public:
explicit test_codecvt() :
std::codecvt< wchar_t, char, std::mbstate_t >()
{
}
protected:
virtual bool do_always_noconv() const throw() { return false; }
virtual int do_encoding() const throw() { return 0; }
virtual std::codecvt_base::result do_in(std::mbstate_t&, const char* from, const char* from_end, const char*& from_next, wchar_t* to, wchar_t* to_end, wchar_t*& to_next) const
{
for (; from != from_end && to != to_end; ++from, ++to)
*to = wchar_t(*from + 1);
if (to == to_end)
return error;
*to = L'\0';
from_next = from;
to_next = to;
return ok;
}
virtual std::codecvt_base::result do_out(std::mbstate_t&, const wchar_t* from, const wchar_t* from_end, const wchar_t*& from_next, char* to, char* to_end, char*& to_next) const
{
for (; from != from_end && to != to_end; ++from, ++to)
*to = static_cast< char >(*from - 1);
if (to == to_end)
return error;
*to = '\0';
from_next = from;
to_next = to;
return ok;
}
virtual std::codecvt_base::result do_unshift(std::mbstate_t&, char* /*from*/, char* /*to*/, char*& /*next*/) const { return ok; }
virtual int do_length(std::mbstate_t&, const char* /*from*/, const char* /*from_end*/, std::size_t /*max*/) const { return 0; }
virtual int do_max_length() const throw() { return 0; }
};
#endif // BOOST_FILESYSTEM_TEST_CODECVT_HPP
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