void NetSocket::HandleInput()
{
// read in data from the socket and compose it into discrete packets that the game can read
bool packetReceived = false;
u_long packetSize = 0;
// read the socket into the receiver buffer which acts as a ring buffer
int rc = recv(m_Sock, m_RecvBuf + m_RecvBegin + m_RecvOffset, RECV_BUFFER_SIZE - (m_RecvBegin + m_RecvOffset), 0);
if (rc == 0)
{
return;
}
if (rc == SOCKET_ERROR)
{
m_DeleteFlag = 1;
return;
}
// header size = 4 bytes
const int hdrSize = sizeof(u_long);
// get the end of the new data read in
unsigned int newData = m_RecvOffset + rc;
int processedData = 0;
while (newData > hdrSize)
{
// we support two types of packets:
// Binary packet - size is a positive 4 byte int at the start of data
// Text packet - size 0, parser searches for carriage return
// convert the first 4 bytes received to host order - this is the size of this packet
packetSize = *(reinterpret_cast<u_long*>(m_RecvBuf + m_RecvBegin));
packetSize = ntohl(packetSize);
if (m_BinaryProtocol)
{
// if the data is less than the packet size, then we haven't finished
// reading this packet and dont have enough data to get the next packet
if (newData < packetSize)
{
break;
}
if (packetSize > MAX_PACKET_SIZE)
{
// buffer overrun
HandleException();
return;
}
// we know the packet size and have the entire thing read in
if (newData >= packetSize)
{
// create the packet from the receiver buffer (m_RecvBegin + hrdSize so we dont read the header *size* into the data)
shared_ptr<BinaryPacket> packet(CB_NEW BinaryPacket(&m_RecvBuf[m_RecvBegin + hdrSize], packetSize - hdrSize));
m_InList.push_back(packet);
packetReceived = true;
processedData += packetSize;
newData -= packetSize;
// move the receiver head up by the packet size amount
m_RecvBegin += packetSize;
}
}
else
{
// text protocol waits for a carriage return and creates a string
// scan the memory we just read for this character
char* cr = static_cast<char*>(memchr(&m_RecvBuf[m_RecvBegin], 0x0a, rc));
if (cr)
{
// if found, change the '\n' in the text packet to a null terminator
*(cr + 1) = 0;
shared_ptr<TextPacket> packet(CB_NEW TextPacket(&m_RecvBuf[m_RecvBegin]));
m_InList.push_back(packet);
packetSize = cr - &m_RecvBuf[m_RecvBegin];
packetReceived = true;
processedData += packetSize;
newData -= packetSize;
// move the receiver head up by the packet size amount
m_RecvBegin += packetSize;
}
}
}
g_pSocketManager->AddToInbound(rc);
m_RecvOffset = newData;
if (packetReceived)
{
if (m_RecvOffset == 0)
{
m_RecvBegin = 0;
}
else if (m_RecvBegin + m_RecvOffset + MAX_PACKET_SIZE > RECV_BUFFER_SIZE)
{
// dont want to allow data to overrun the receiver buffer, so copy leftover bits
// to the beginning and reset the heads
int leftover = m_RecvOffset;
memcpy(m_RecvBuf, &m_RecvBuf[m_RecvBegin], m_RecvOffset);
m_RecvBegin = 0;
}
}
}
//
// NetSocket::VHandleInput - Chapter 19, page 671
//
void NetSocket::VHandleInput()
{
bool bPktRecieved = false;
u_long packetSize = 0;
int rc = recv(m_sock, m_recvBuf+m_recvBegin+m_recvOfs, RECV_BUFFER_SIZE-(m_recvBegin+m_recvOfs), 0);
char metrics[1024];
sprintf_s(metrics, 1024, "Incoming: %6d bytes. Begin %6d Offset %4d\n", rc, m_recvBegin, m_recvOfs);
std::stringstream ss;
ss << "Network" << metrics;
LOG_WRITE(ss.str());
if (rc==0)
{
return;
}
if (rc==SOCKET_ERROR)
{
m_deleteFlag = 1;
return;
}
const int hdrSize = sizeof(u_long);
unsigned int newData = m_recvOfs + rc;
int processedData = 0;
while (newData > hdrSize)
{
// There are two types of packets at the lowest level of our design:
// BinaryPacket - Sends the size as a positive 4 byte integer
// TextPacket - Sends 0 for the size, the parser will search for a CR
packetSize = *(reinterpret_cast<u_long*>(m_recvBuf+m_recvBegin));
packetSize = ntohl(packetSize);
if (m_bBinaryProtocol)
{
// we don't have enough new data to grab the next packet
if (newData < packetSize)
break;
if (packetSize > MAX_PACKET_SIZE)
{
// prevent nasty buffer overruns!
HandleException();
return;
}
if (newData >= packetSize)
{
// we know how big the packet is...and we have the whole thing
//
//[mrmike] - a little code to aid debugging network packets here!
//char test[1024];
//memcpy(test, &m_recvBuf[m_recvBegin+hdrSize], packetSize);
//test[packetSize+1]='\r';
//test[packetSize+2]='\n';
//test[packetSize+3]=0;
//LOG_WRITE("Network", test);
shared_ptr<BinaryPacket> pkt(QSE_NEW BinaryPacket(&m_recvBuf[m_recvBegin+hdrSize], packetSize-hdrSize));
m_InList.push_back(pkt);
bPktRecieved = true;
processedData += packetSize;
newData -= packetSize;
m_recvBegin += packetSize;
}
}
else
{
// the text protocol waits for a carraige return and creates a string
char *cr = static_cast<char *>(memchr(&m_recvBuf[m_recvBegin], 0x0a, rc));
if (cr)
{
*(cr+1) = 0;
shared_ptr<TextPacket> pkt(QSE_NEW TextPacket(&m_recvBuf[m_recvBegin]));
m_InList.push_back(pkt);
packetSize = cr - &m_recvBuf[m_recvBegin];
bPktRecieved = true;
processedData += packetSize;
newData -= packetSize;
m_recvBegin += packetSize;
}
}
}
g_pSocketManager->AddToInbound(rc);
m_recvOfs = newData;
if (bPktRecieved)
{
if (m_recvOfs == 0)
{
m_recvBegin = 0;
}
else if (m_recvBegin + m_recvOfs + MAX_PACKET_SIZE > RECV_BUFFER_SIZE)
{
// we don't want to overrun the buffer - so we copy the leftover bits
// to the beginning of the recieve buffer and start over
int leftover = m_recvOfs;
memcpy(m_recvBuf, &m_recvBuf[m_recvBegin], m_recvOfs);
m_recvBegin = 0;
}
}
}
