public static ResourceRecord FromByteArray(byte[] data, int payloadBase, int offset, out int size)
{
int origOffset = offset;
ResourceRecord rr = new ResourceRecord();
int nameDataSize;
rr.name = DnsName.FromByteArray(data, payloadBase, offset, out nameDataSize);
offset += nameDataSize;
rr.meta = Serialization.Deserialize <Meta>(data, offset, Marshal.SizeOf <Meta>());
offset += Marshal.SizeOf <Meta>();
//the use of pointer complicates things
int recordDataReadSize = 0;
switch ((RecordType)rr.meta.rType)
{
case RecordType.A:
rr.data = ResourceData.Address.FromByteArray(data, offset);
recordDataReadSize = rr.data.Size;
break;
case RecordType.NS:
case RecordType.PTR:
case RecordType.CNAME:
rr.data = ResourceData.NameEntry.FromByteArray((RecordType)rr.meta.rType, data, payloadBase, offset, out recordDataReadSize);
break;
case RecordType.MX:
rr.data = ResourceData.MailExchange.FromByteArray(data, payloadBase, offset, out recordDataReadSize);
break;
case RecordType.SOA:
rr.data = ResourceData.SOA.FromByteArray(data, payloadBase, offset, out recordDataReadSize);
break;
case RecordType.TXT:
rr.data = ResourceData.Text.FromByteArray(data, offset, rr.meta.rdLength);
recordDataReadSize = rr.data.Size;
break;
default:
rr.data = ResourceData.Unknown.FromByteArray((UInt16)rr.meta.rType, data, offset, rr.meta.rdLength);
recordDataReadSize = rr.data.Size;
break;
}
offset += recordDataReadSize;
size = offset - origOffset;
return(rr);
}
public static Question FromByteArray(byte[] arr, int payloadBase, int offset, out int size)
{
Question ret = new Question();
int nameDataSize;
ret.name = DnsName.FromByteArray(arr, payloadBase, offset, out nameDataSize);
offset += nameDataSize;
ret.meta = Serialization.Deserialize <Meta>(arr, offset, 4);
size = 4 + nameDataSize;
return(ret);
}
public static DnsName FromByteArray(byte[] arr, int payloadBase, int offset, out int size)
{
//these variables are used for size calculation
int origIncOffset = offset;
int origOffset = offset;
bool pointerFollowed = false;
DnsName ret = new DnsName();
int cmpLen;
List <String> components = new List <string>();
while (true)
{
cmpLen = arr[offset++];
if (cmpLen >= 192)
{
//this is a pointer entry
int newOffset = ((cmpLen & 63) << 8) | arr[offset++];
if (!pointerFollowed)
{
origIncOffset = offset;
pointerFollowed = true;
}
offset = newOffset + payloadBase;
}
else
{
components.Add(Encoding.ASCII.GetString(arr, offset, cmpLen));
offset += cmpLen;
}
if (cmpLen == 0)
{
break;
}
}
ret.domainComponents = components.ToArray();
ret.CalculateSize();
size = (pointerFollowed ? origIncOffset : offset) - origOffset;
return(ret);
}
public Question()
{
meta.qClass = 1; //fixed to "IN"
name = new DnsName();
}
