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/*
Basic History plugin
Copyright (C) 2011-2012 Krzysztof Kral
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation version 2
of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
template<class _Elem>
class codecvt_CodePage : public std::codecvt<_Elem, char, mbstate_t>
{
private:
UINT codePage;
public:
typedef std::codecvt<_Elem, char, mbstate_t> _Mybase;
typedef typename _Mybase::result result;
typedef char _Byte;
typedef _Elem intern_type;
typedef _Byte extern_type;
typedef mbstate_t state_type;
explicit codecvt_CodePage(UINT _codePage)
: _Mybase(0),
codePage(_codePage)
{ // construct with ref count
}
virtual ~codecvt_CodePage()
{ // destroy the object
}
protected:
virtual result do_in(mbstate_t&, const _Byte *, const _Byte *, const _Byte *&, _Elem *, _Elem *, _Elem *&) const
{ // convert bytes [_First1, _Last1) to [_First2, _Last)
return (_Mybase::error); // not implemented
}
virtual result do_out(mbstate_t&, const _Elem *_First1, const _Elem *_Last1, const _Elem *& _Mid1, _Byte *_First2, _Byte *_Last2, _Byte *& _Mid2) const
{ // convert [_First1, _Last1) to bytes [_First2, _Last)
_Mid1 = _First1;
_Mid2 = _First2;
int conv = WideCharToMultiByte(codePage, 0, _First1, _Last1 - _First1, _First2, _Last2 - _First2, NULL, NULL);
if (conv == 0)
{
if (GetLastError() == ERROR_INSUFFICIENT_BUFFER)
return (_Mybase::partial);
else
return (_Mybase::error);
}
else
{
_Mid1 = _Last1;
_Mid2 = _First2 + conv;
}
return (_Mybase::ok);
}
virtual result do_unshift(mbstate_t&,
_Byte *_First2, _Byte *, _Byte *& _Mid2) const
{ // generate bytes to return to default shift state
_Mid2 = _First2;
return (_Mybase::ok);
}
virtual int do_length(const mbstate_t&, const _Byte *, const _Byte *, size_t _Count) const _THROW0()
{ // return min(_Count, converted length of bytes [_First1, _Last1))
return (int)_Count; // not implemented
}
virtual bool do_always_noconv() const _THROW0()
{ // return true if conversions never change input
return (false);
}
virtual int do_max_length() const _THROW0()
{ // return maximum length required for a conversion
return 6;
}
virtual int do_encoding() const _THROW0()
{ // return length of code sequence (from codecvt)
return 0; // -1 => state dependent, 0 => varying length
}
};
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