private byte[] DecompressPacket(SOEClient sender, byte[] packet)
{
// Compressable?
if (!sender.IsCompressable())
{
return(packet);
}
// Remove the OpCode and compression flag
byte[] data = new byte[packet.Length - 3];
for (int i = 3; i < packet.Length; i++)
{
data[i - 3] = packet[i];
}
byte[] decompressedData = data;
// Decompress the old packet..
MemoryStream dataStream = new MemoryStream(data);
MemoryStream decompressed = new MemoryStream();
if (packet[2] == 0x01)
{
using (ZlibStream zlibStream = new ZlibStream(dataStream, CompressionMode.Decompress))
{
zlibStream.CopyTo(decompressed);
}
// Reconstruct the packet..
decompressedData = decompressed.ToArray();
}
// Reconstruct the packet..
byte[] newPacket = new byte[decompressedData.Length + 2];
// OpCode
int place = 0;
for (int i = 0; i < 2; i++)
{
newPacket[place] = packet[i];
place++;
}
// Data
for (int i = 0; i < decompressedData.Length; i++)
{
newPacket[place] = decompressedData[i];
place++;
}
// And.. return!
return(newPacket);
}
public void HandlePacket(SOEClient sender, byte[] rawPacket)
{
// Read the packet
SOEReader reader = new SOEReader(rawPacket);
ushort opCode = reader.ReadUInt16();
bool goodPacket = true;
// Get the packet data
byte[] data = new byte[rawPacket.Length - (int)sender.GetCRCLength()];
for (int i = 0; i < data.Length; i++)
{
data[i] = rawPacket[i];
}
// Get the CRC32 checksum for the packet
uint crc32 = sender.GetCRC32Checksum(data);
// Get our expected CRC32 checksum
uint expectedCRC32 = 0;
uint place = sender.GetCRCLength() - 1;
for (int i = rawPacket.Length - (int)sender.GetCRCLength(); i < rawPacket.Length; i++)
{
expectedCRC32 += (uint)(rawPacket[i] << (8 * (int)place));
place--;
}
// We have our CRCs! Check if the packet is formed correctly!
byte[] crc = BitConverter.GetBytes(crc32).Reverse().ToArray();
byte[] expectedCRC = BitConverter.GetBytes(expectedCRC32).Reverse().ToArray();
int start = 4 - (int)sender.GetCRCLength();
for (int i = start; i < sender.GetCRCLength(); i++)
{
// If they're not the same, we're a bad packet
if (crc[i] != expectedCRC[i])
{
// Set that we're bad, and get outta the loop
goodPacket = false;
break;
}
}
// Are we malformed?
if (!goodPacket)
{
Log("[WARNING] Received malformed packet! Incorrect CRC Appended!");
return;
}
// Remove the CRC
rawPacket = data;
// Do we need to worry about decryption/decompression?
if (sender.HasSession())
{
// Is the client encrypted?
if (sender.IsEncrypted())
{
rawPacket = DecryptPacket(sender, rawPacket);
}
// Is the client compressable?
if (sender.IsCompressable())
{
// It seems that all packets after 0x02 are compressable..
rawPacket = DecompressPacket(sender, rawPacket);
}
}
// Handle the decompressed/decrypted packet!
HandlePacket(sender, new SOEPacket(opCode, rawPacket));
}
private byte[] DecompressPacket(SOEClient sender, byte[] packet)
{
// Compressable?
if (!sender.IsCompressable())
{
return packet;
}
// Remove the OpCode and compression flag
byte[] data = new byte[packet.Length - 3];
for (int i = 3; i < packet.Length; i++)
{
data[i - 3] = packet[i];
}
byte[] decompressedData = data;
// Decompress the old packet..
MemoryStream dataStream = new MemoryStream(data);
MemoryStream decompressed = new MemoryStream();
if (packet[2] == 0x01)
{
using (ZlibStream zlibStream = new ZlibStream(dataStream, CompressionMode.Decompress))
{
zlibStream.CopyTo(decompressed);
}
// Reconstruct the packet..
decompressedData = decompressed.ToArray();
}
// Reconstruct the packet..
byte[] newPacket = new byte[decompressedData.Length + 2];
// OpCode
int place = 0;
for (int i = 0; i < 2; i++)
{
newPacket[place] = packet[i];
place++;
}
// Data
for (int i = 0; i < decompressedData.Length; i++)
{
newPacket[place] = decompressedData[i];
place++;
}
// And.. return!
return newPacket;
}
public SOEPacket GetFinalSOEPacket(SOEClient client, bool compressed, bool appendCRC)
{
// Data
byte[] originalPacket = GetRaw();
byte[] rawData = new byte[Data.Count - 2];
byte[] newPacket;
// Fail-safe
ushort originalOpCode = 0;
// Are we a message?
if (IsMessage)
{
// Yes, so we'll try make a data packet.
// Can we fit into one packet?
SOEMessage message = GetFinalSOEMessage(client);
if (message.IsFragmented)
{
// We're gonna have to fragment, so we can't handle this gracefully...
client.Server.Log("[ERROR] Tried to handle 'GetFinalSOEPacket' call on written SOEMessage gracefully but failed due to fragmentation. Returning null.");
client.Server.Log("[INFO] Call 'GetFinalSOEMessage' as it deals with fragmentation!");
// Welp, goodbye world! :'(
return null;
}
// Make the new packet
Data = new List<byte>();
AddUInt16(client.GetNextSequenceNumber());
AddBytes(originalPacket);
// Set our raw data
rawData = GetRaw();
// Change our OpCode so that we're a reliable data packet
originalOpCode = OpCode;
OpCode = (ushort)SOEOPCodes.RELIABLE_DATA;
// Because we're reliable data, take compression into consideration and append a CRC
compressed = true;
appendCRC = true;
// We handled it gracefully! :)
client.Server.Log("[INFO] Handled 'GetFinalSOEPacket' call on written SOEMessage gracefully.");
}
else
{
// Get just the data for this packet. (Remove the OP Code)
byte[] completeRawData = GetRaw();
for (int i = 2; i < completeRawData.Length; i++)
{
rawData[i - 2] = completeRawData[i];
}
}
// Start a new packet
Data = new List<byte>();
AddUInt16(OpCode);
// Are we compressable?
if (client.IsCompressable())
{
if (compressed)
{
AddBoolean(rawData.Length > 100);
if (rawData.Length > 100)
{
rawData = client.Compress(rawData);
}
}
}
// Are we encrypted?
if (client.IsEncrypted())
{
// Encrypt the SOE Packet
rawData = client.Encrypt(rawData);
}
// Add the raw data
AddBytes(rawData);
// Appended CRC32?
if (appendCRC)
{
AddBytes(client.GetAppendedCRC32(GetRaw()));
}
// Set our new packet
newPacket = GetRaw();
// Get our old message before compression/encryption
Data = new List<byte>(originalPacket);
// If we are a message, set our OpCode back
if (IsMessage)
{
// Set our OpCode back too..
OpCode = originalOpCode;
}
// Return the compressed/encrypted packet
return new SOEPacket(OpCode, newPacket);
}
public void HandlePacket(SOEClient sender, byte[] rawPacket)
{
// Read the packet
SOEReader reader = new SOEReader(rawPacket);
ushort opCode = reader.ReadUInt16();
bool goodPacket = true;
// Get the packet data
byte[] data = new byte[rawPacket.Length - (int)sender.GetCRCLength()];
for (int i = 0; i < data.Length; i++)
{
data[i] = rawPacket[i];
}
// Get the CRC32 checksum for the packet
uint crc32 = sender.GetCRC32Checksum(data);
// Get our expected CRC32 checksum
uint expectedCRC32 = 0;
uint place = sender.GetCRCLength() - 1;
for (int i = rawPacket.Length - (int)sender.GetCRCLength(); i < rawPacket.Length; i++)
{
expectedCRC32 += (uint)(rawPacket[i] << (8 * (int)place));
place--;
}
// We have our CRCs! Check if the packet is formed correctly!
byte[] crc = BitConverter.GetBytes(crc32).Reverse().ToArray();
byte[] expectedCRC = BitConverter.GetBytes(expectedCRC32).Reverse().ToArray();
int start = 4 - (int)sender.GetCRCLength();
for (int i = start; i < sender.GetCRCLength(); i++)
{
// If they're not the same, we're a bad packet
if (crc[i] != expectedCRC[i])
{
// Set that we're bad, and get outta the loop
goodPacket = false;
break;
}
}
// Are we malformed?
if (!goodPacket)
{
Log("[WARNING] Received malformed packet! Incorrect CRC Appended!");
return;
}
// Remove the CRC
rawPacket = data;
// Do we need to worry about decryption/decompression?
if (sender.HasSession())
{
// Is the client encrypted?
if (sender.IsEncrypted())
{
rawPacket = DecryptPacket(sender, rawPacket);
}
// Is the client compressable?
if (sender.IsCompressable())
{
// It seems that all packets after 0x02 are compressable..
rawPacket = DecompressPacket(sender, rawPacket);
}
}
// Handle the decompressed/decrypted packet!
HandlePacket(sender, new SOEPacket(opCode, rawPacket));
}
