public int Write(byte[] !buffer, ref int offset)
{
offset += LabelEncoding.PutBytes(Name, buffer, offset);
offset += NetworkBitConverter.PutBytes((ushort)Type,
buffer, offset);
offset += NetworkBitConverter.PutBytes((ushort)Class,
buffer, offset);
return(offset);
}
public static ResourceRecord Parse(byte [] !buffer, ref int offset)
{
string name;
if ((buffer[offset] & 0xc0) == 0xc0)
{
// Detected compression. Name is at offset in
// lower 14 bits of next 2 bytes.
int start = NetworkBitConverter.ToInt16(buffer, offset);
if (LabelEncoding.GetString(buffer, start & 0x3fff,
out name) == 0)
{
throw new InvalidDnsFormatException("name");
}
offset += 2;
}
else
{
int used = LabelEncoding.GetString(buffer, offset, out name);
if (used == 0)
{
throw new InvalidDnsFormatException("name");
}
offset += used;
}
ushort rType = NetworkBitConverter.ToUInt16(buffer, offset);
offset += 2;
ushort rClass = NetworkBitConverter.ToUInt16(buffer, offset);
offset += 2;
uint ttlSeconds = NetworkBitConverter.ToUInt32(buffer, offset);
offset += 4;
ushort rdataLength = NetworkBitConverter.ToUInt16(buffer, offset);
offset += 2;
byte [] rdata = new byte[rdataLength];
Array.Copy(buffer, offset, rdata, 0, rdataLength);
offset += rdataLength;
return(new ResourceRecord(name, (Type)rType, (Class)rClass,
ttlSeconds, rdata));
}
public static Query !Parse(byte [] !buffer, ref int offset)
{
string name;
int used = LabelEncoding.GetString(buffer, offset, out name);
if (used == 0)
{
throw new InvalidDnsFormatException("name");
}
offset += used;
ushort qType = NetworkBitConverter.ToUInt16(buffer, offset);
offset += 2;
ushort qClass = NetworkBitConverter.ToUInt16(buffer, offset);
offset += 2;
return(new Query(name, (Type)qType, (Class)qClass));
}
public int Write(byte [] !buffer, ref int offset)
{
offset += LabelEncoding.PutBytes(Name, buffer, offset);
offset += NetworkBitConverter.PutBytes((ushort)Type,
buffer, offset);
offset += NetworkBitConverter.PutBytes((ushort)Class,
buffer, offset);
offset += NetworkBitConverter.PutBytes(TtlSeconds, buffer, offset);
if (RData == null)
{
offset += NetworkBitConverter.PutBytes((ushort)0,
buffer, offset);
}
else
{
offset += NetworkBitConverter.PutBytes((ushort)RData.Length,
buffer, offset);
RData.CopyTo(buffer, offset);
offset += RData.Length;
}
return(offset);
}
