void to_bytes_step(const std::codecvt<CvtTypes...> & cvt, typename make_to_bytes_context<std::codecvt<CvtTypes...>>::type & ctx)
{
ctx.res = cvt.out(ctx.state,
ctx.from_beg, ctx.from_end, ctx.from_stopped,
ctx.to_beg, ctx.to_end, ctx.to_stopped);
if (ctx.res == std::codecvt_base::partial) {
//output extern_char buffer contains cvt.max_length or more - input is partial
ctx.is_partial_input = (ctx.to_stopped - ctx.to_end >= cvt.max_length());
}
}
const std::basic_string<Byte> out(
const std::basic_string<CharType>& internal_str,
const std::codecvt<CharType, Byte, mbstate_t>& codecvt)
{
typedef std::basic_string<CharType> wstring;
typedef std::basic_string<Byte> string;
typedef std::codecvt<CharType, Byte, mbstate_t> codecvt_type;
string external_str;
typename wstring::size_type internal_str_size = internal_str.length();
typename wstring::size_type out_buf_size =
static_cast<typename wstring::size_type>(codecvt.max_length()) *
internal_str_size;
#if defined(MA_USE_CXX11_STDLIB_MEMORY)
detail::unique_ptr<Byte[]> out_buf(new Byte[out_buf_size]);
#else
detail::scoped_array<Byte> out_buf(new Byte[out_buf_size]);
#endif
const CharType* first_internal = internal_str.data();
const CharType* last_internal = first_internal + internal_str_size;
const CharType* next_internal = first_internal;
Byte* first_external = out_buf.get();
Byte* last_external = first_external + out_buf_size;
Byte* next_external = first_external;
// Zero initialized
typename codecvt_type::state_type state;
std::memset(&state, 0, sizeof(state));
typename codecvt_type::result r = codecvt.out(state,
first_internal, last_internal, next_internal,
first_external, last_external, next_external);
if (codecvt_type::ok == r)
{
external_str.assign(first_external, next_external);
}
else if (codecvt_type::noconv == r)
{
external_str.assign(reinterpret_cast<const Byte*>(first_internal),
reinterpret_cast<const Byte*>(last_internal));
}
else
{
boost::throw_exception(bad_conversion());
}
return external_str;
}
const std::basic_string<Byte> out(
const std::basic_string<CharType>& internal_str,
const std::codecvt<CharType, Byte, mbstate_t>& codecvt)
{
typedef std::basic_string<CharType> wstring;
typedef std::basic_string<Byte> string;
typedef std::codecvt<CharType, Byte, mbstate_t> codecvt_type;
string external_str;
typename wstring::size_type internal_str_size = internal_str.length();
typename wstring::size_type out_buf_size =
codecvt.max_length() * internal_str_size;
boost::scoped_array<Byte> out_buf(new Byte[out_buf_size]);
const CharType* first_internal = internal_str.data();
const CharType* last_internal = first_internal + internal_str_size;
const CharType* next_internal = first_internal;
Byte* first_external = out_buf.get();
Byte* last_external = first_external + out_buf_size;
Byte* next_external = first_external;
typename codecvt_type::state_type state(0);
typename codecvt_type::result r = codecvt.out(state,
first_internal, last_internal, next_internal,
first_external, last_external, next_external);
if (codecvt_type::ok == r)
{
external_str.assign(first_external, next_external);
}
else if (codecvt_type::noconv == r)
{
external_str.assign(reinterpret_cast<const Byte*>(first_internal),
reinterpret_cast<const Byte*>(last_internal));
}
else
{
boost::throw_exception(bad_conversion());
}
return external_str;
}