internal static DnsGateway CreateInstance(DnsGatewayType gatewayType, DnsDatagram dns, int offsetInDns, int length)
{
switch (gatewayType)
{
case DnsGatewayType.None:
return(None);
case DnsGatewayType.IpV4:
if (length < IpV4Address.SizeOf)
{
return(null);
}
return(new DnsGatewayIpV4(dns.ReadIpV4Address(offsetInDns, Endianity.Big)));
case DnsGatewayType.IpV6:
if (length < IpV6Address.SizeOf)
{
return(null);
}
return(new DnsGatewayIpV6(dns.ReadIpV6Address(offsetInDns, Endianity.Big)));
case DnsGatewayType.DomainName:
DnsDomainName domainName;
int numBytesRead;
if (!DnsDomainName.TryParse(dns, offsetInDns, length, out domainName, out numBytesRead))
{
return(null);
}
return(new DnsGatewayDomainName(domainName));
default:
return(null);
}
}