public ToffeeClientPacketReadResult(bool success, bool encrypted, ClientPacketHeader header, byte[] data)
{
Success = success;
Encrypted = encrypted;
Header = header;
Data = data;
}
/// <summary>
/// Build a final compressed, encrypted, and encoded packet.
/// </summary>
/// <returns>The packet data.</returns>
public byte[] BuildPacket()
{
// Get the packet data
byte[] data = Data.ToArray();
// Compression
bool compressed = false;
if (DataLength > 100)
{
byte[] compressedData = CompressionService.Compress(data);
if (compressedData.Length < data.Length)
{
data = compressedData;
compressed = true;
}
}
ushort dataLength = (ushort)data.Length;
// Create the packet header
ClientPacketHeader header = new ClientPacketHeader
{
OpCode = OpCode,
Compressed = compressed,
Length = dataLength,
Timestamp = TimeUtil.GetUnixTimestamp()
};
LastHeader = header;
// Append the header and CRC to the compressed data
ToffeePacket packet = new ToffeePacket(Sender);
packet.Write(header);
packet.Write(data, true);
packet.Write(CRC.CalculateCRC32(data));
data = packet.GetBytes();
// Encryption
bool encrypted = ((Encrypted && Sender.UseEncryption) || (Sender.ForceEncryption));
if ((encrypted) && (!Sender.UseEncryption))
{
Sender.Disconnect();
return(new byte[0]);
}
if (encrypted)
{
data = Sender.Encryption.Encrypt(data);
}
// Create the final packet
packet = new ToffeePacket(Sender);
packet.Write(encrypted);
packet.Write(data, true);
return(packet.GetBytes());
}
public static ToffeeClientPacketReadResult Read(ToffeeParticipant receiver, byte[] packet)
{
try
{
// Is this packet encrypted?
bool encrypted = packet[0] == 0x01;
if (encrypted)
{
// Is this client setup to use encryption?
if (receiver.UseEncryption)
{
packet = receiver.Encryption.Decrypt(packet.Skip(1).ToArray());
}
}
else
{
packet = packet.Skip(1).ToArray();
}
// Iterate through the packet
ToffeePacketIterator iterator = new ToffeePacketIterator(receiver, packet);
// Get the header, data, and CRC
ClientPacketHeader header = iterator.ReadStruct <ClientPacketHeader>();
byte[] packetData = iterator.ReadBytes(header.Length);
uint sentCrc = iterator.ReadUInt32();
// Is the CRC correct?
uint calculatedCrc = CRC.CalculateCRC32(packetData);
if (sentCrc != calculatedCrc)
{
return(new ToffeeClientPacketReadResult(false, encrypted, new ClientPacketHeader(), null));
}
// Is this packet compressed?
if (header.Compressed)
{
packetData = CompressionService.Decompress(packetData);
}
// Return the read result
return(new ToffeeClientPacketReadResult(true, encrypted, header, packetData));
}
catch
{
return(new ToffeeClientPacketReadResult(false, false, new ClientPacketHeader(), null));
}
}
