// ToUnsigned
static bool ToUnsigned(
const COpcString& cString,
ULong& nValue,
ULong nMax,
ULong nMin
)
{
// extract base
COpcText cText;
COpcTextReader cReader(cString);
UINT uBase = 10;
cText.SetType(COpcText::Literal);
cText.SetText(L"0x");
cText.SetIgnoreCase();
if (cReader.GetNext(cText))
{
uBase = 16;
}
// read unsigned value.
return ToUnsigned(cReader.GetBuf(), nValue, nMax, nMin, uBase);
}
// ToSigned
static bool ToSigned(
const COpcString& cString,
Long& nValue,
Long nMax,
Long nMin
)
{
nValue = 0;
// extract plus sign
bool bSign = true;
COpcText cText;
COpcTextReader cReader(cString);
cText.SetType(COpcText::Literal);
cText.SetText(L"+");
if (!cReader.GetNext(cText))
{
// extract minus sign
cText.SetType(COpcText::Literal);
cText.SetText(L"-");
bSign = !cReader.GetNext(cText);
}
// read unsigned value.
ULong uValue = 0;
if (!ToUnsigned(cReader.GetBuf(), uValue, (bSign)?nMax:-nMin, 0, 10))
{
return false;
}
nValue = (Long)uValue;
// apply sign.
if (!bSign)
{
nValue = -nValue;
}
return true;
}
