Interpretting .pac script using QScriptEngine()

Hi,

I'm trying to interpret .pac script using QScriptEngine(). .pac is nothing but a javascript which is used by web browser/http client to get proxy details.

Here is my code:

main()
{
QScriptEngine engine;
QString str, str1, str2; int i=0;
QFile scriptFile("proxy.pac");
bool bRes = scriptFile.open(QIODevice::ReadOnly|QIODevice::Tex t);
str = scriptFile.readAll();// has entire code

bRes = engine.canEvaluate(str);
QScriptValue ctor = engine.evaluate(str);
scriptFile.close();

ctor = engine.evaluate("FindProxyForURL(\"/mail\", \"www.google.com\")");
bRes = ctor.isError(); // returns true

str1 = ctor.toString(); // returns {"ReferenceError: dnsResolve is not defined"}
}

Output: Please refer comments in the above code.
It looks QScriptEngine does not have dnsResolve() method.

Simple .pac script will look like this,

function FindProxyForURL(url, host)
{
url = url.toLowerCase();
host = host.toLowerCase();
hostIP = dnsResolve(host);
if (hostIP == false)
var hostIP = "1.2.3.4";
if (shExpMatch(host, "myhost.mycompany.com") {
alert("AutoCache Running Info \nPAC File:" + pacname);
}
if (isInNet(hostIP, "221.11.22.33", "255.255.255.0")
return "DIRECT1";
if (shExpMatch(host, "techdomain.myhost.abcorg.com"))
return SECONDARYPROXY;
return MAINPROXY;
}

And this javascript uses mainly below mentioned functions,
dnsResolve()
isInNet()
shExpMatch()
isResolvable()
isPlainHostName()
dnsDomainIs()

more info about .pac: http://en.wikipedia.org/wiki/Proxy_auto-config

I'm sure some you have faced this problem and overcome this, if so, could you please help in this?

Thanks in advance...

Saravanan