internal override DnsResourceData CreateInstance(DnsDatagram dns, int offsetInDns, int length)
{
if (length < MinimumLength)
{
return(null);
}
byte prefixLength = dns[offsetInDns + Offset.PrefixLength];
if (prefixLength > MaxPrefixLength)
{
return(null);
}
offsetInDns += ConstantPartLength;
length -= ConstantPartLength;
int addressSuffixLength = CalculateAddressSuffixLength(prefixLength);
if (length < addressSuffixLength)
{
return(null);
}
IpV6Address addressSuffix = new IpV6Address((UInt128)dns.ReadUnsignedBigInteger(offsetInDns, addressSuffixLength, Endianity.Big));
offsetInDns += addressSuffixLength;
length -= addressSuffixLength;
if (IsAddressSuffixTooSmall(prefixLength, addressSuffix) || IsAddressSuffixTooBig(prefixLength, addressSuffix))
{
return(null);
}
DnsDomainName prefixName;
int prefixNameLength;
if (!DnsDomainName.TryParse(dns, offsetInDns, length, out prefixName, out prefixNameLength))
{
return(null);
}
if (prefixNameLength != length)
{
return(null);
}
return(new DnsResourceDataA6(prefixLength, addressSuffix, prefixName));
}
internal override DnsResourceData CreateInstance(DnsDatagram dns, int offsetInDns, int length)
{
if (length < 2)
{
return((DnsResourceData)null);
}
byte prefixLength = dns[offsetInDns];
if ((int)prefixLength > 128)
{
return((DnsResourceData)null);
}
++offsetInDns;
--length;
int length1 = DnsResourceDataA6.CalculateAddressSuffixLength(prefixLength);
if (length < length1)
{
return((DnsResourceData)null);
}
IpV6Address addressSuffix = new IpV6Address((UInt128)dns.ReadUnsignedBigInteger(offsetInDns, length1, Endianity.Big));
offsetInDns += length1;
length -= length1;
if (DnsResourceDataA6.IsAddressSuffixTooSmall(prefixLength, addressSuffix) || DnsResourceDataA6.IsAddressSuffixTooBig(prefixLength, addressSuffix))
{
return((DnsResourceData)null);
}
DnsDomainName domainName;
int numBytesRead;
if (!DnsDomainName.TryParse(dns, offsetInDns, length, out domainName, out numBytesRead))
{
return((DnsResourceData)null);
}
if (numBytesRead != length)
{
return((DnsResourceData)null);
}
return((DnsResourceData) new DnsResourceDataA6(prefixLength, addressSuffix, domainName));
}