UTF-8 <==> unicode(WCHAR)

static int fetchWordFromUTF8(const chConstStringA& strText, WCHAR& result)
{
    int nLength = strText.length();
    if(nLength <= 0) return 0;

    LPCSTR lpszTextA = strText.c_ptr();
    BYTE byte = *lpszTextA;
    if ((byte >> 7) == 0x00)
    {
        result = (WCHAR)(BYTE)*lpszTextA;
        return 1;
    }
    else if ((byte >> 5) == 0x06)
    {
        if(nLength >= 2)
        {
            DWORD dw0 = (DWORD)(BYTE)lpszTextA[0];
            DWORD dw1 = (DWORD)(BYTE)lpszTextA[1];
            result = (WCHAR)((dw1&0x3F) | ((dw0&0x1F) << 6));
            return 2;
        }
    }
    else if ((byte >> 4) == 0x0E)
    {
        if(nLength >= 3)
        {
            DWORD dw0 = (DWORD)(BYTE)lpszTextA[0];
            DWORD dw1 = (DWORD)(BYTE)lpszTextA[1];
            DWORD dw2 = (DWORD)(BYTE)lpszTextA[2];
            result = (WCHAR)((dw2&0x3F) | ((dw1&0x3F) << 6) | ((dw0&0x0F)<<12));
            return 3;
        }
    }
    result = '?';
    return 1;
}

static int fetchUTF8FromWord(const UINT& word, LPSTR szResult)
{
    if (word < 0x0080)
    {
        szResult[0] = (ACHAR)word;
        return 1;
    }
    else if (word < 0x0800)
    {
        szResult[0] = (ACHAR)(0xC0 | (BYTE)(word>>6));
        szResult[1] = (ACHAR)(0x80 | (BYTE)(word&0x003F));
        return 2;
    }
    else// if (word <= 0xFFFF)
    {
        szResult[0] = (ACHAR)(0xE0 | (BYTE)(word>>12));
        szResult[1] = (ACHAR)(0x80 | (BYTE)((word>>6) & 0x3F));
        szResult[2] = (ACHAR)(0x80 | (BYTE)(word&0x3F));
        return 3;
    }
    szResult[0] = '?';
    return 1;
}