internal static DnsOptions Read(DataSegment data)
{
List <DnsOption> options = new List <DnsOption>();
while (data.Length != 0)
{
if (data.Length < DnsOption.MinimumLength)
{
return(null);
}
DnsOptionCode code = (DnsOptionCode)data.ReadUShort(0, Endianity.Big);
ushort optionDataLength = data.ReadUShort(sizeof(ushort), Endianity.Big);
int optionLength = DnsOption.MinimumLength + optionDataLength;
if (data.Length < optionLength)
{
return(null);
}
DnsOption option = DnsOption.CreateInstance(code, data.Subsegment(DnsOption.MinimumLength, optionDataLength));
if (option == null)
{
return(null);
}
options.Add(option);
data = data.Subsegment(optionLength, data.Length - optionLength);
}
return(new DnsOptions(options));
}
internal static DnsOptions Read(DataSegment data)
{
List <DnsOption> list = new List <DnsOption>();
int offset;
for (; data.Length != 0; data = data.Subsegment(offset, data.Length - offset))
{
if (data.Length < 4)
{
return((DnsOptions)null);
}
DnsOptionCode code = (DnsOptionCode)data.ReadUShort(0, Endianity.Big);
ushort num = data.ReadUShort(2, Endianity.Big);
offset = 4 + (int)num;
if (data.Length < offset)
{
return((DnsOptions)null);
}
DnsOption instance = DnsOption.CreateInstance(code, data.Subsegment(4, (int)num));
if (instance == null)
{
return((DnsOptions)null);
}
list.Add(instance);
}
return(new DnsOptions((IList <DnsOption>)list));
}