private static unsafe bool HandlePacket(byte *offset, byte *end, out int increment)
{
Packet.Header *header = (Packet.Header *)offset;
increment = -1;
UInt16 checksum = CRC16.Generate(offset + Marshal.SizeOf(header->HeaderChecksum), Marshal.SizeOf(*header) - Marshal.SizeOf(header->HeaderChecksum));
DebugTools.Print($"Header: HeaderChecksum={header->HeaderChecksum.ToString("X4")}, DataChecksum={header->DataChecksum.ToString("X4")}, Type={header->Type}, Size={header->Size} (Checksum={checksum.ToString("X4")}, Hex={ToHexString(offset, Marshal.SizeOf(*header))})");
if (!Packet.VerifyHeader(header))
{
DebugTools.Print($"Header checksum failed: {header->HeaderChecksum.ToString("X4")} / {checksum.ToString("X4")}");
return(false);
}
if (offset + (Marshal.SizeOf(*header) + header->Size) > end)
{
increment = 0;
return(false);
}
checksum = CRC16.Generate(offset + Marshal.SizeOf(*header), header->Size);
DebugTools.Print($"Data: DataChecksum={header->DataChecksum.ToString("X4")}, Size={header->Size} (Checksum={checksum.ToString("X4")}, Hex={ToHexString(offset + Marshal.SizeOf(*header), header->Size)})");
if (!Packet.VerifyData(header))
{
DebugTools.Print($"Content checksum failed: {header->DataChecksum.ToString("X4")} / {checksum.ToString("X4")}");
return(false);
}
increment = Marshal.SizeOf(*header) + header->Size;
OnPacketReceivedEvent?.Invoke(header);
return(true);
}
/// <summary>
/// Subscribes to a given PacketType event, which is called every time we receive a packet of that type.
/// </summary>
public void Subscribe(TerrPacketType type, OnPacketReceivedEvent evnt)
{
if (TerrPacket.IsValidType(type))
{
if (_packetEvents.ContainsKey(type))
_packetEvents[type] += evnt;
else
_packetEvents.Add(type, evnt);
}
else
throw new ArgumentException($"{type} is not a valid TerrPacketType type.");
}
public void SubscribeMany(OnPacketReceivedEvent evnt, params TerrPacketType[] types)
{
foreach(TerrPacketType type in types)
Subscribe(type, evnt);
}
