internal static RdpPacket ReceiveTPKTOrFastPath(out int type)
{
int num = 0;
int num2 = 0;
RdpPacket p = Tcp_Receive(null, 4);
p.Position = 0L;
if (p.Length == 0L)
{
type = -1;
return(null);
}
num2 = p.ReadByte();
if (num2 == 3)
{
p.ReadByte();
num = p.ReadBigEndian16();
type = 0;
}
else
{
num = p.ReadByte();
if ((num & 0x80) != 0)
{
num &= -129;
num = (num << 8) + p.ReadByte();
}
FastPath_EncryptionFlags flags = (FastPath_EncryptionFlags)(num2 >> 6);
if ((flags & FastPath_EncryptionFlags.FASTPATH_OUTPUT_ENCRYPTED) != ((FastPath_EncryptionFlags)0))
{
type = 0xfe;
}
else
{
type = 0xff;
}
}
long position = p.Position;
p.Position = 4L;
p = Tcp_Receive(p, num - 4);
p.Position = position;
if ((type != 0xff) && (type != 0xfe))
{
p.Position = 4L;
p.ReadByte();
type = p.ReadByte();
if (type == 240)
{
p.ReadByte();
return(p);
}
p.ReadBigEndian16();
p.ReadBigEndian16();
p.ReadByte();
}
return(p);
}
private static int receive_AttachUserConfirm()
{
int num;
int num2 = 0;
int num3 = 0;
int num4 = 0;
RdpPacket packet = ISO.ReceiveTPKTOrFastPath(out num);
num2 = packet.ReadByte();
if ((num2 >> 2) != AUCF)
{
throw new RDFatalException("Bad AUCF " + num2);
}
num3 = packet.ReadByte();
if (num3 != 0)
{
throw new RDFatalException("Bad AURQ got " + num3);
}
if ((num2 & 2) != 0)
{
num4 = packet.ReadBigEndian16();
}
if (packet.Position != packet.Length)
{
throw new RDFatalException("Illegal Aucf packet length");
}
return(num4);
}
internal static RdpPacket Receive()
{
byte[] buffer = new byte[0x3000];
int count = Network.Receive(buffer);
RdpPacket packet = new RdpPacket();
packet.Write(buffer, 0, count);
packet.Position = 0L;
int num2 = 0;
if (packet.ReadByte() == 3)
{
packet.ReadByte();
num2 = packet.ReadBigEndian16();
long position = packet.Position;
while (num2 > count)
{
int num4 = Network.Receive(buffer);
packet.Position = count;
packet.Write(buffer, 0, num4);
count += num4;
}
packet.Position = position;
return(packet);
}
num2 = packet.ReadByte();
if ((num2 & 0x80) != 0)
{
num2 &= -129;
num2 = num2 << (8 + packet.ReadByte());
}
return(packet);
}
private static int berParseHeader(RdpPacket data, BER_Header eTagVal)
{
int num = 0;
int num2 = 0;
int num3 = 0;
int num4 = (int)eTagVal;
if (num4 > 0xff)
{
num = data.ReadBigEndian16();
}
else
{
num = data.ReadByte();
}
if (num != num4)
{
throw new RDFatalException("Bad tag " + num.ToString() + " but need " + eTagVal.ToString());
}
num3 = data.ReadByte();
if (num3 <= 0x80)
{
return(num3);
}
num3 -= 0x80;
num2 = 0;
while (num3-- != 0)
{
num2 = (num2 << 8) + data.ReadByte();
}
return(num2);
}
internal static RdpPacket ReceiveMCS(out int channel, out int type)
{
int num = 0;
int num2 = 0;
RdpPacket packet = ReceiveTPKTOrFastPath(out type);
if ((type == 0xff) || (type == 0xfe))
{
channel = MCS.MSC_GLOBAL_CHANNEL;
return(packet);
}
if (type != 240)
{
throw new RDFatalException("Illegal data type " + ((int)type).ToString());
}
if (packet == null)
{
channel = -1;
return(null);
}
num = packet.ReadByte();
num2 = num >> 2;
if (num2 != MCS.SDIN)
{
if (num2 != MCS.DPUM)
{
throw new RDFatalException("Illegal data opcode " + num.ToString());
}
throw new EndOfTransmissionException("End of transmission!");
}
packet.Position += 2L;
channel = packet.ReadBigEndian16();
packet.ReadByte();
if ((packet.ReadByte() & 0x80) != 0)
{
packet.Position += 1L;
}
return(packet);
}
