Function util_ConvertHex

src/twparser/parserhelper.cpp:874–903

//=========================================================================

int util_ConvertHex(const char* const cpsz, int* const pnCharsRead)
{
    ASSERT(util_AsciiCharsActLikeTheyShould());
    ASSERT(cpsz && pnCharsRead);

    if (*cpsz == 0 || !std::isxdigit<TCHAR>(*cpsz, std::locale()))
        throw eParserBadHex(cStringUtil::StrToTstr(cpsz));

    int         iValue;
    const char* psz = cpsz;
    for (*pnCharsRead = 0, iValue = 0; *psz && std::isxdigit<TCHAR>(*psz, std::locale()) && (*pnCharsRead < 2);
         psz++, (*pnCharsRead)++)
    {
        iValue *= 0x10;

        if (std::isdigit<TCHAR>(*psz, std::locale()))
        {
            iValue += (*psz - '0');
        }
        else
        {
            if (std::islower<TCHAR>(*psz, std::locale()))
                iValue += (*psz - 'a' + 10); // so that A=10, B=11, ..., F=15
            else                             // is uppercase
                iValue += (*psz - 'A' + 10); // so that a=10, a=11, ..., f=15
        }
    }

    return iValue;
}

int util_ConvertUnicode(const char* const cpsz, int* const pnCharsRead)
{