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#if !defined(HISTORYSTATS_GUARD_UTF8BUFFER_H)
#define HISTORYSTATS_GUARD_UTF8BUFFER_H
#include <streambuf>
#include <string>
class UTF8Buffer
: public std::basic_streambuf<wchar_t, std::char_traits<wchar_t> >
, private pattern::NotCopyable<UTF8Buffer>
{
private:
typedef std::char_traits<wchar_t> _Tr;
private:
int m_BufSize;
wchar_t* m_pBuf;
ext::a::ostream& m_Stream;
char* m_pUTF8Buf;
WCHAR* m_pBufW;
#if !defined(_UNICODE)
WCHAR m_CharMap[256];
#endif // _UNICODE
private:
void dump(const wchar_t* pBegin, const wchar_t* pEnd)
{
size_t len = pEnd - pBegin;
#if !defined(_UNICODE)
WCHAR* pW = m_pBufW;
char* pA = m_pBuf;
while (pA < pEnd)
{
*pW++ = m_CharMap[static_cast<unsigned char>(*pA++)];
}
#endif // _UNICODE
size_t utf8_len = utils::rawUTF8Encode(m_pBufW, len, m_pUTF8Buf);
m_Stream.write(m_pUTF8Buf, utf8_len);
}
protected:
virtual int_type overflow(int_type _C = UTF8Buffer::_Tr::eof())
{
if (_Tr::eq_int_type(_Tr::eof(), _C))
{
return _Tr::not_eof(_C);
}
else if (pptr() != nullptr && pptr() < epptr())
{
*pptr() = _Tr::to_char_type(_C);
pbump(1);
return _C;
}
else
{
dump(pbase(), pptr());
setp(m_pBuf, m_pBuf + m_BufSize);
*pptr() = _Tr::to_char_type(_C);
pbump(1);
return _C;
}
}
virtual int sync()
{
dump(pbase(), pptr());
setp(m_pBuf, m_pBuf + m_BufSize);
return 0;
}
public:
explicit UTF8Buffer(ext::a::ostream& outStream, int bufferSize = 4096)
: m_BufSize(bufferSize), m_Stream(outStream)
{
m_pBuf = new wchar_t[m_BufSize];
m_pUTF8Buf = new char[3 * m_BufSize];
#if defined(_UNICODE)
m_pBufW = m_pBuf;
#else // _UNICODE
m_pBufW = new WCHAR[m_BufSize];
#endif // _UNICODE
#if !defined(_UNICODE)
char ANSIChars[256];
array_each_(i, ANSIChars)
{
ANSIChars[i] = static_cast<char>(i);
}
m_CharMap[0] = ' ';
MultiByteToWideChar(CP_ACP, 0, ANSIChars + 1, 255, m_CharMap + 1, 255);
#endif // _UNICODE
setp(m_pBuf, m_pBuf + m_BufSize);
}
virtual ~UTF8Buffer()
{
delete[] m_pBuf;
delete[] m_pUTF8Buf;
#if !defined(_UNICODE)
delete[] m_pBufW;
#endif // _UNICODE
}
};
#endif // HISTORYSTATS_GUARD_UTF8BUFFER_H
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