internal static DomainName Get(BackReferenceBinaryReader reader)
{
byte stringLength = reader.ReadByte();
if (stringLength >> 6 == 3)
{
//In case of pointer
ushort ptr;
BinaryHelper.FromBytes(new byte[] { (byte)(stringLength - (3 << 6)), reader.ReadByte() }, out ptr);
return(reader.Get <DomainName>(ptr));
}
else
{
DomainName dn = new DomainName();
reader.Register((int)reader.BaseStream.Position - 1, dn);
//stringLength = reader.ReadByte();
if (stringLength != 0)
{
dn.Add(Encoding.UTF8.GetString(reader.ReadBytes(stringLength), 0, stringLength));
//dn.Add(Encoding.UTF8.GetString(bytes, index + 1, bytes[index]));
dn.AddRange(DomainName.Get(reader));
}
//else
// index++;
return(dn);
}
}
private static Message GetMessage(BackReferenceBinaryReader reader)
{
ushort id = BinaryHelper.ReadUInt16(reader);
Message m = new Message(id);
byte b = reader.ReadByte();
//Qr, Opcode, Aa, Tc, Rd
m.RecursionDesired = (b % 2) == 1;
b = (byte)(b >> 1);
m.Truncated = (b % 2) == 1;
b = (byte)(b >> 1);
m.AuthoritativeAnswer = (b % 2) == 1;
b = (byte)(b >> 1);
int opCodeNumber = b % 16;
m.OpCode = (OpCode)opCodeNumber;
b = (byte)(b >> 4);
m.QueryResponse = (Qr)b;
//Ra, Z, Rcode
b = reader.ReadByte();
m.RecursionAvailable = b > 127;
b = (byte)((b << 1) >> 1);
m.ResponseCode = (ResponseCode)b;
ushort questionEntryCount = BinaryHelper.ReadUInt16(reader);
ushort answerEntryCount = BinaryHelper.ReadUInt16(reader);
ushort authorityEntryCount = BinaryHelper.ReadUInt16(reader);
ushort additionalEntryCount = BinaryHelper.ReadUInt16(reader);
for (int i = 0; i < questionEntryCount; i++)
{
m.Questions.Add(Question.Get(reader));
}
for (int i = 0; i < answerEntryCount; i++)
{
m.Answers.Add(Answer.Get(reader));
}
for (int i = 0; i < authorityEntryCount; i++)
{
m.Authorities.Add(Answer.Get(reader));
}
for (int i = 0; i < additionalEntryCount; i++)
{
m.Additionals.Add(Answer.Get(reader));
}
return(m);
}