Method UnpackPacket

src/engine/shared/network.cpp:261–372

TODO: rename this function

// TODO: rename this function
int CNetBase::UnpackPacket(unsigned char *pBuffer, int Size, CNetPacketConstruct *pPacket, bool &Sixup, SECURITY_TOKEN *pSecurityToken, SECURITY_TOKEN *pResponseToken)
{
	std::optional<int> Flags = UnpackPacketFlags(pBuffer, Size);
	if(!Flags)
	{
		return -1;
	}

	// log the data
	if(ms_DataLogRecv)
	{
		int Type = 0;
		io_write(ms_DataLogRecv, &Type, sizeof(Type));
		io_write(ms_DataLogRecv, &Size, sizeof(Size));
		io_write(ms_DataLogRecv, pBuffer, Size);
		io_flush(ms_DataLogRecv);
	}

	// read the packet
	pPacket->m_Flags = *Flags;

	if(pPacket->m_Flags & NET_PACKETFLAG_CONNLESS)
	{
		Sixup = (pBuffer[0] & 0x3) == 1;
		if(Sixup && (pSecurityToken == nullptr || pResponseToken == nullptr))
			return -1;
		int Offset = Sixup ? 9 : 6;
		if(Size < Offset)
			return -1;

		if(Sixup)
		{
			*pSecurityToken = ToSecurityToken(pBuffer + 1);
			*pResponseToken = ToSecurityToken(pBuffer + 5);
		}

		pPacket->m_Flags = NET_PACKETFLAG_CONNLESS;
		pPacket->m_Ack = 0;
		pPacket->m_NumChunks = 0;
		pPacket->m_DataSize = Size - Offset;
		mem_copy(pPacket->m_aChunkData, pBuffer + Offset, pPacket->m_DataSize);

		if(!Sixup && mem_comp(pBuffer, NET_HEADER_EXTENDED, sizeof(NET_HEADER_EXTENDED)) == 0)
		{
			pPacket->m_Flags |= NET_PACKETFLAG_EXTENDED;
			mem_copy(pPacket->m_aExtraData, pBuffer + sizeof(NET_HEADER_EXTENDED), sizeof(pPacket->m_aExtraData));
		}
	}
	else
	{
		if(pPacket->m_Flags & NET_PACKETFLAG_UNUSED)
			Sixup = true;
		if(Sixup && pSecurityToken == nullptr)
			return -1;
		int DataStart = Sixup ? 7 : NET_PACKETHEADERSIZE;
		if(Size < DataStart)
			return -1;