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codecvt_null.cpp
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/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
// codecvt_null.cpp
// Copyright (c) 2004 Robert Ramey, Indiana University (garcia@osl.iu.edu)
// Andrew Lumsdaine, Indiana University (lums@osl.iu.edu).
// Use, modification and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#define BOOST_WARCHIVE_SOURCE
#include <boost/serialization/config.hpp>
#include <boost/archive/codecvt_null.hpp>
// codecvt implementation for passing wchar_t objects to char output
// without any translation whatever. Used to implement binary output
// of wchar_t objects.
namespace boost {
namespace archive {
std::codecvt_base::result
codecvt_null<wchar_t>::do_out(
std::mbstate_t & /*state*/,
const wchar_t * first1,
const wchar_t * last1,
const wchar_t * & next1,
char * first2,
char * last2,
char * & next2
) const {
while(first1 != last1){
// Per std::22.2.1.5.2/2, we can store no more that
// last2-first2 characters. If we need to more encode
// next internal char type, return 'partial'.
if(static_cast<int>(sizeof(wchar_t)) > (last2 - first2)){
next1 = first1;
next2 = first2;
return std::codecvt_base::partial;
}
* reinterpret_cast<wchar_t *>(first2) = * first1++;
first2 += sizeof(wchar_t);
}
next1 = first1;
next2 = first2;
return std::codecvt_base::ok;
}
std::codecvt_base::result
codecvt_null<wchar_t>::do_in(
std::mbstate_t & /*state*/,
const char * first1,
const char * last1,
const char * & next1,
wchar_t * first2,
wchar_t * last2,
wchar_t * & next2
) const {
// Process input characters until we've run of them,
// or the number of remaining characters is not
// enough to construct another output character,
// or we've run out of place for output characters.
while(first2 != last2){
// Have we converted all input characters?
// Return with 'ok', if so.
if (first1 == last1)
break;
// Do we have less input characters than needed
// for a single output character?
if(static_cast<int>(sizeof(wchar_t)) > (last1 - first1)){
next1 = first1;
next2 = first2;
return std::codecvt_base::partial;
}
*first2++ = * reinterpret_cast<const wchar_t *>(first1);
first1 += sizeof(wchar_t);
}
next1 = first1;
next2 = first2;
return std::codecvt_base::ok;
}
} // namespace archive
} // namespace boost