inline std::codecvt_base::result convert(
std::codecvt< LocalCharT, char, std::mbstate_t > const& fac,
std::mbstate_t& state,
const char*& pSrcBegin,
const char* pSrcEnd,
LocalCharT*& pDstBegin,
LocalCharT* pDstEnd)
{
return fac.in(state, pSrcBegin, pSrcEnd, pSrcBegin, pDstBegin, pDstEnd, pDstBegin);
}
const std::basic_string<CharType> in(
const std::basic_string<Byte>& external_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;
typename string::size_type external_str_size = external_str.length();
const Byte* first_external = external_str.data();
const Byte* last_external = first_external + external_str_size;
const Byte* next_external = last_external;
wstring internal_str;
// Zero initialized
typename codecvt_type::state_type state;
std::memset(&state, 0, sizeof(state));
typename wstring::size_type out_buf_size =
static_cast<typename wstring::size_type>(
codecvt.length(state, first_external, last_external,
internal_str.max_size()));
#if defined(MA_USE_CXX11_STDLIB_MEMORY)
detail::unique_ptr<CharType[]> out_buf(new CharType[out_buf_size]);
#else
detail::scoped_array<CharType> out_buf(new CharType[out_buf_size]);
#endif
CharType* first_internal = out_buf.get();
CharType* last_internal = first_internal + out_buf_size;
CharType* next_internal = first_internal;
typename codecvt_type::result r = codecvt.in(state,
first_external, last_external, next_external,
first_internal, last_internal, next_internal);
if (codecvt_type::ok == r)
{
internal_str.assign(first_internal, last_internal);
}
else if (codecvt_type::noconv == r)
{
internal_str.assign(reinterpret_cast<const CharType*>(first_external),
reinterpret_cast<const CharType*>(last_external));
}
else
{
boost::throw_exception(bad_conversion());
}
return internal_str;
}
void from_bytes_step(const std::codecvt<CvtTypes...> & cvt, typename make_from_bytes_context<std::codecvt<CvtTypes...>>::type & ctx)
{
ctx.res = cvt.in(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) {
// cvt.length returns 0 on intern_char non empty buffer,
// it can't convert from input - input is partial
ctx.is_partial_input = cvt.length(ctx.state, ctx.from_stopped, ctx.from_end, 1) == 0;
}
}
const std::basic_string<CharType> in(
const std::basic_string<Byte>& external_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;
typename string::size_type external_str_size = external_str.length();
const Byte* first_external = external_str.data();
const Byte* last_external = first_external + external_str_size;
const Byte* next_external = last_external;
wstring internal_str;
typename codecvt_type::state_type state(0);
typename wstring::size_type out_buf_size = codecvt.length(state,
first_external, last_external, internal_str.max_size());
boost::scoped_array<CharType> out_buf(new CharType[out_buf_size]);
CharType* first_internal = out_buf.get();
CharType* last_internal = first_internal + out_buf_size;
CharType* next_internal = first_internal;
typename codecvt_type::result r = codecvt.in(state,
first_external, last_external, next_external,
first_internal, last_internal, next_internal);
if (codecvt_type::ok != r)
{
boost::throw_exception(bad_conversion());
}
else if (codecvt_type::noconv == r)
{
internal_str.assign(reinterpret_cast<const CharType*>(first_external),
reinterpret_cast<const CharType*>(last_external));
}
else
{
internal_str.assign(first_internal, last_internal);
}
return internal_str;
}
