/*
=======================
SV_SendClientDatagram
=======================
*/
void SV_SendClientDatagram( sv_client_t *cl )
{
byte msg_buf[NET_MAX_PAYLOAD];
sizebuf_t msg;
svs.currentPlayer = cl;
svs.currentPlayerNum = (cl - svs.clients);
BF_Init( &msg, "Datagram", msg_buf, sizeof( msg_buf ));
// always send servertime at new frame
BF_WriteByte( &msg, svc_time );
BF_WriteFloat( &msg, sv.time );
SV_WriteClientdataToMessage( cl, &msg );
SV_WriteEntitiesToClient( cl, &msg );
// copy the accumulated multicast datagram
// for this client out to the message
if( BF_CheckOverflow( &cl->datagram )) MsgDev( D_WARN, "datagram overflowed for %s\n", cl->name );
else BF_WriteBits( &msg, BF_GetData( &cl->datagram ), BF_GetNumBitsWritten( &cl->datagram ));
BF_Clear( &cl->datagram );
if( BF_CheckOverflow( &msg ))
{
// must have room left for the packet header
MsgDev( D_WARN, "msg overflowed for %s\n", cl->name );
BF_Clear( &msg );
}
// send the datagram
Netchan_TransmitBits( &cl->netchan, BF_GetNumBitsWritten( &msg ), BF_GetData( &msg ));
}
/*
=================
CL_FlushEntityPacket
=================
*/
void CL_FlushEntityPacket( sizebuf_t *msg )
{
int newnum;
entity_state_t from, to;
MsgDev( D_INFO, "FlushEntityPacket()\n" );
Q_memset( &from, 0, sizeof( from ));
cl.frames[cl.parsecountmod].valid = false;
cl.validsequence = 0; // can't render a frame
// read it all, but ignore it
while( 1 )
{
newnum = BF_ReadWord( msg );
if( !newnum ) break; // done
if( BF_CheckOverflow( msg ))
Host_Error( "CL_FlushEntityPacket: read overflow\n" );
MSG_ReadDeltaEntity( msg, &from, &to, newnum, CL_IsPlayerIndex( newnum ), cl.mtime[0] );
}
}
/*
==================
CL_ParsePacketEntities
An svc_packetentities has just been parsed, deal with the
rest of the data stream.
==================
*/
void CL_ParsePacketEntities( sizebuf_t *msg, qboolean delta )
{
frame_t *newframe, *oldframe;
int oldindex, newnum, oldnum;
int oldpacket, newpacket;
cl_entity_t *player;
entity_state_t *oldent;
int i, count;
// save first uncompressed packet as timestamp
if( cls.changelevel && !delta && cls.demorecording )
CL_WriteDemoJumpTime();
// first, allocate packet for new frame
count = BF_ReadWord( msg );
newpacket = cl.parsecountmod;
newframe = &cl.frames[newpacket];
// allocate parse entities
newframe->first_entity = cls.next_client_entities;
newframe->num_entities = 0;
newframe->valid = true; // assume valid
if( delta )
{
int subtracted;
oldpacket = BF_ReadByte( msg );
subtracted = ((( cls.netchan.incoming_sequence & 0xFF ) - oldpacket ) & 0xFF );
if( subtracted == 0 )
{
Host_Error( "CL_DeltaPacketEntities: update too old, connection dropped.\n" );
return;
}
if( subtracted >= CL_UPDATE_MASK )
{
// we can't use this, it is too old
Con_NPrintf( 2, "^3Warning:^1 delta frame is too old^7\n" );
CL_FlushEntityPacket( msg );
return;
}
oldframe = &cl.frames[oldpacket & CL_UPDATE_MASK];
if(( cls.next_client_entities - oldframe->first_entity ) > ( cls.num_client_entities - 128 ))
{
Con_NPrintf( 2, "^3Warning:^1 delta frame is too old^7\n" );
CL_FlushEntityPacket( msg );
return;
}
}
else
{
// this is a full update that we can start delta compressing from now
oldframe = NULL;
oldpacket = -1; // delta too old or is initial message
cl.force_send_usercmd = true; // send reply
cls.demowaiting = false; // we can start recording now
}
// mark current delta state
cl.validsequence = cls.netchan.incoming_sequence;
oldent = NULL;
oldindex = 0;
if( !oldframe )
{
oldnum = MAX_ENTNUMBER;
}
else
{
if( oldindex >= oldframe->num_entities )
{
oldnum = MAX_ENTNUMBER;
}
else
{
oldent = &cls.packet_entities[(oldframe->first_entity+oldindex) % cls.num_client_entities];
oldnum = oldent->number;
}
}
while( 1 )
{
newnum = BF_ReadWord( msg );
if( !newnum ) break; // end of packet entities
if( BF_CheckOverflow( msg ))
Host_Error( "CL_ParsePacketEntities: read overflow\n" );
while( oldnum < newnum )
{
// one or more entities from the old packet are unchanged
CL_DeltaEntity( msg, newframe, oldnum, oldent, true );
oldindex++;
if( oldindex >= oldframe->num_entities )
{
oldnum = MAX_ENTNUMBER;
}
else
{
oldent = &cls.packet_entities[(oldframe->first_entity+oldindex) % cls.num_client_entities];
oldnum = oldent->number;
}
}
if( oldnum == newnum )
{
// delta from previous state
CL_DeltaEntity( msg, newframe, newnum, oldent, false );
oldindex++;
if( oldindex >= oldframe->num_entities )
{
oldnum = MAX_ENTNUMBER;
}
else
{
oldent = &cls.packet_entities[(oldframe->first_entity+oldindex) % cls.num_client_entities];
oldnum = oldent->number;
}
continue;
}
if( oldnum > newnum )
{
// delta from baseline ?
CL_DeltaEntity( msg, newframe, newnum, NULL, false );
continue;
}
}
// any remaining entities in the old frame are copied over
while( oldnum != MAX_ENTNUMBER )
{
// one or more entities from the old packet are unchanged
CL_DeltaEntity( msg, newframe, oldnum, oldent, true );
oldindex++;
if( oldindex >= oldframe->num_entities )
{
oldnum = MAX_ENTNUMBER;
}
else
{
oldent = &cls.packet_entities[(oldframe->first_entity+oldindex) % cls.num_client_entities];
oldnum = oldent->number;
}
}
cl.frame = *newframe;
if( !cl.frame.valid ) return;
player = CL_GetLocalPlayer();
if( cls.state != ca_active )
{
// client entered the game
cls.state = ca_active;
cl.force_refdef = true;
cls.changelevel = false; // changelevel is done
cls.changedemo = false; // changedemo is done
SCR_MakeLevelShot(); // make levelshot if needs
Cvar_SetFloat( "scr_loading", 0.0f ); // reset progress bar
if(( cls.demoplayback || cls.disable_servercount != cl.servercount ) && cl.video_prepped )
SCR_EndLoadingPlaque(); // get rid of loading plaque
}
// update local player states
clgame.dllFuncs.pfnTxferLocalOverrides( &player->curstate, &newframe->local.client );
// update state for all players
for( i = 0; i < cl.maxclients; i++ )
{
cl_entity_t *ent = CL_GetEntityByIndex( i + 1 );
if( !ent ) continue;
clgame.dllFuncs.pfnProcessPlayerState( &newframe->playerstate[i], &ent->curstate );
newframe->playerstate[i].number = ent->index;
}
cl.frame = *newframe;
}
/*
=====================
CL_ParseServerMessage
=====================
*/
void CL_ParseServerMessage( sizebuf_t *msg )
{
char *s;
int i, j, cmd;
int param1, param2;
int bufStart;
cls_message_debug.parsing = true; // begin parsing
starting_count = BF_GetNumBytesRead( msg ); // updates each frame
// parse the message
while( 1 )
{
if( BF_CheckOverflow( msg ))
{
Host_Error( "CL_ParseServerMessage: overflow!\n" );
return;
}
// mark start position
bufStart = BF_GetNumBytesRead( msg );
// end of message
if( BF_GetNumBitsLeft( msg ) < 8 )
break;
cmd = BF_ReadByte( msg );
// record command for debugging spew on parse problem
CL_Parse_RecordCommand( cmd, bufStart );
// other commands
switch( cmd )
{
case svc_bad:
Host_Error( "svc_bad\n" );
break;
case svc_nop:
// this does nothing
break;
case svc_disconnect:
MsgDev( D_INFO, "Disconnected from server\n" );
CL_Drop ();
Host_AbortCurrentFrame ();
break;
case svc_changing:
if( BF_ReadOneBit( msg ))
{
cls.changelevel = true;
S_StopAllSounds();
if( cls.demoplayback )
{
SCR_BeginLoadingPlaque( cl.background );
cls.changedemo = true;
}
}
else MsgDev( D_INFO, "Server disconnected, reconnecting\n" );
CL_ClearState ();
CL_InitEdicts (); // re-arrange edicts
if( cls.demoplayback )
{
cl.background = (cls.demonum != -1) ? true : false;
cls.state = ca_connected;
}
else cls.state = ca_connecting;
cls.connect_time = MAX_HEARTBEAT; // CL_CheckForResend() will fire immediately
break;
case svc_setview:
cl.refdef.viewentity = BF_ReadWord( msg );
break;
case svc_sound:
CL_ParseSoundPacket( msg, false );
break;
case svc_time:
// shuffle timestamps
cl.mtime[1] = cl.mtime[0];
cl.mtime[0] = BF_ReadFloat( msg );
break;
case svc_print:
i = BF_ReadByte( msg );
MsgDev( D_INFO, "^6%s", BF_ReadString( msg ));
if( i == PRINT_CHAT ) S_StartLocalSound( "common/menu2.wav", VOL_NORM, false );
break;
case svc_stufftext:
CL_ParseStuffText( msg );
break;
case svc_lightstyle:
CL_ParseLightStyle( msg );
break;
case svc_setangle:
CL_ParseSetAngle( msg );
break;
case svc_serverdata:
Cbuf_Execute(); // make sure any stuffed commands are done
CL_ParseServerData( msg );
break;
case svc_addangle:
CL_ParseAddAngle( msg );
break;
case svc_clientdata:
CL_ParseClientData( msg );
break;
case svc_packetentities:
CL_ParsePacketEntities( msg, false );
break;
case svc_deltapacketentities:
CL_ParsePacketEntities( msg, true );
break;
case svc_updatepings:
CL_UpdateUserPings( msg );
break;
case svc_usermessage:
CL_RegisterUserMessage( msg );
break;
case svc_particle:
CL_ParseParticles( msg );
break;
case svc_restoresound:
CL_ParseRestoreSoundPacket( msg );
break;
case svc_spawnstatic:
CL_ParseStaticEntity( msg );
break;
case svc_ambientsound:
CL_ParseSoundPacket( msg, true );
break;
case svc_crosshairangle:
CL_ParseCrosshairAngle( msg );
break;
case svc_spawnbaseline:
CL_ParseBaseline( msg );
break;
case svc_temp_entity:
CL_ParseTempEntity( msg );
break;
case svc_setpause:
cl.refdef.paused = ( BF_ReadOneBit( msg ) != 0 );
break;
case svc_deltamovevars:
CL_ParseMovevars( msg );
break;
case svc_customization:
CL_ParseCustomization( msg );
break;
case svc_centerprint:
CL_CenterPrint( BF_ReadString( msg ), 0.25f );
break;
case svc_event:
CL_ParseEvent( msg );
break;
case svc_event_reliable:
CL_ParseReliableEvent( msg );
break;
case svc_updateuserinfo:
CL_UpdateUserinfo( msg );
break;
case svc_intermission:
cl.refdef.intermission = true;
break;
case svc_modelindex:
CL_PrecacheModel( msg );
break;
case svc_soundindex:
CL_PrecacheSound( msg );
break;
case svc_soundfade:
CL_ParseSoundFade( msg );
break;
case svc_cdtrack:
param1 = BF_ReadByte( msg );
param1 = bound( 1, param1, MAX_CDTRACKS ); // tracknum
param2 = BF_ReadByte( msg );
param2 = bound( 1, param2, MAX_CDTRACKS ); // loopnum
S_StartBackgroundTrack( clgame.cdtracks[param1-1], clgame.cdtracks[param2-1], 0 );
break;
case svc_serverinfo:
CL_ServerInfo( msg );
break;
case svc_eventindex:
CL_PrecacheEvent( msg );
break;
case svc_deltatable:
Delta_ParseTableField( msg );
break;
case svc_weaponanim:
param1 = BF_ReadByte( msg ); // iAnim
param2 = BF_ReadByte( msg ); // body
CL_WeaponAnim( param1, param2 );
break;
case svc_bspdecal:
CL_ParseStaticDecal( msg );
break;
case svc_roomtype:
param1 = BF_ReadShort( msg );
Cvar_SetFloat( "room_type", param1 );
break;
case svc_chokecount:
i = BF_ReadByte( msg );
j = cls.netchan.incoming_acknowledged - 1;
for( ; i > 0 && j > cls.netchan.outgoing_sequence - CL_UPDATE_BACKUP; j-- )
{
if( cl.frames[j & CL_UPDATE_MASK].receivedtime != -3.0 )
{
cl.frames[j & CL_UPDATE_MASK].receivedtime = -2.0;
i--;
}
}
break;
case svc_resourcelist:
CL_ParseResourceList( msg );
break;
case svc_director:
CL_ParseDirector( msg );
break;
case svc_studiodecal:
CL_ParseStudioDecal( msg );
break;
case svc_querycvarvalue:
CL_ParseCvarValue( msg );
break;
case svc_querycvarvalue2:
CL_ParseCvarValue2( msg );
break;
default:
CL_ParseUserMessage( msg, cmd );
break;
}
}
cls_message_debug.parsing = false; // done
// we don't know if it is ok to save a demo message until
// after we have parsed the frame
if( !cls.demoplayback )
{
if( cls.demorecording && !cls.demowaiting )
{
CL_WriteDemoMessage( false, starting_count, msg );
}
else if( cls.state != ca_active )
{
CL_WriteDemoMessage( true, starting_count, msg );
}
}
}
/*
===================
CL_WritePacket
Create and send the command packet to the server
Including both the reliable commands and the usercmds
===================
*/
void CL_WritePacket( void )
{
sizebuf_t buf;
qboolean send_command = false;
byte data[MAX_CMD_BUFFER];
int i, from, to, key, size;
int numbackup = 2;
int numcmds;
int newcmds;
int cmdnumber;
// don't send anything if playing back a demo
if( cls.demoplayback || cls.state == ca_cinematic )
return;
if( cls.state == ca_disconnected || cls.state == ca_connecting )
return;
CL_ComputePacketLoss ();
#ifndef _DEBUG
if( cl_cmdrate->value < MIN_CMD_RATE )
{
Cvar_SetFloat( "cl_cmdrate", MIN_CMD_RATE );
}
#endif
Q_memset( data, 0, MAX_CMD_BUFFER );
BF_Init( &buf, "ClientData", data, sizeof( data ));
// Determine number of backup commands to send along
numbackup = bound( 0, cl_cmdbackup->integer, MAX_BACKUP_COMMANDS );
if( cls.state == ca_connected ) numbackup = 0;
// Check to see if we can actually send this command
// In single player, send commands as fast as possible
// Otherwise, only send when ready and when not choking bandwidth
if(( cl.maxclients == 1 ) || ( NET_IsLocalAddress( cls.netchan.remote_address ) && !host_limitlocal->integer ))
send_command = true;
else if(( host.realtime >= cls.nextcmdtime ) && Netchan_CanPacket( &cls.netchan ))
send_command = true;
if( cl.force_send_usercmd )
{
send_command = true;
cl.force_send_usercmd = false;
}
if(( cls.netchan.outgoing_sequence - cls.netchan.incoming_acknowledged ) >= CL_UPDATE_MASK )
{
if(( host.realtime - cls.netchan.last_received ) > CONNECTION_PROBLEM_TIME )
{
Con_NPrintf( 1, "^3Warning:^1 Connection Problem^7\n" );
cl.validsequence = 0;
}
}
if( cl_nodelta->integer )
{
cl.validsequence = 0;
}
// send a userinfo update if needed
if( userinfo->modified )
{
BF_WriteByte( &cls.netchan.message, clc_userinfo );
BF_WriteString( &cls.netchan.message, Cvar_Userinfo( ));
}
if( send_command )
{
int outgoing_sequence;
if( cl_cmdrate->integer > 0 )
cls.nextcmdtime = host.realtime + ( 1.0f / cl_cmdrate->value );
else cls.nextcmdtime = host.realtime; // always able to send right away
if( cls.lastoutgoingcommand == -1 )
{
outgoing_sequence = cls.netchan.outgoing_sequence;
cls.lastoutgoingcommand = cls.netchan.outgoing_sequence;
}
else outgoing_sequence = cls.lastoutgoingcommand + 1;
// begin a client move command
BF_WriteByte( &buf, clc_move );
// save the position for a checksum byte
key = BF_GetRealBytesWritten( &buf );
BF_WriteByte( &buf, 0 );
// write packet lossage percentation
BF_WriteByte( &buf, cls.packet_loss );
// say how many backups we'll be sending
BF_WriteByte( &buf, numbackup );
// how many real commands have queued up
newcmds = ( cls.netchan.outgoing_sequence - cls.lastoutgoingcommand );
// put an upper/lower bound on this
newcmds = bound( 0, newcmds, MAX_TOTAL_CMDS );
if( cls.state == ca_connected ) newcmds = 0;
BF_WriteByte( &buf, newcmds );
numcmds = newcmds + numbackup;
from = -1;
for( i = numcmds - 1; i >= 0; i-- )
{
cmdnumber = ( cls.netchan.outgoing_sequence - i ) & CL_UPDATE_MASK;
to = cmdnumber;
CL_WriteUsercmd( &buf, from, to );
from = to;
if( BF_CheckOverflow( &buf ))
Host_Error( "CL_Move, overflowed command buffer (%i bytes)\n", MAX_CMD_BUFFER );
}
// calculate a checksum over the move commands
size = BF_GetRealBytesWritten( &buf ) - key - 1;
buf.pData[key] = CRC32_BlockSequence( buf.pData + key + 1, size, cls.netchan.outgoing_sequence );
// message we are constructing.
i = cls.netchan.outgoing_sequence & CL_UPDATE_MASK;
// determine if we need to ask for a new set of delta's.
if( cl.validsequence && (cls.state == ca_active) && !( cls.demorecording && cls.demowaiting ))
{
cl.delta_sequence = cl.validsequence;
BF_WriteByte( &buf, clc_delta );
BF_WriteByte( &buf, cl.validsequence & 0xFF );
}
else
{
// request delta compression of entities
cl.delta_sequence = -1;
}
if( BF_CheckOverflow( &buf ))
{
Host_Error( "CL_Move, overflowed command buffer (%i bytes)\n", MAX_CMD_BUFFER );
}
// remember outgoing command that we are sending
cls.lastoutgoingcommand = cls.netchan.outgoing_sequence;
// composite the rest of the datagram..
if( BF_GetNumBitsWritten( &cls.datagram ) <= BF_GetNumBitsLeft( &buf ))
BF_WriteBits( &buf, BF_GetData( &cls.datagram ), BF_GetNumBitsWritten( &cls.datagram ));
BF_Clear( &cls.datagram );
// deliver the message (or update reliable)
Netchan_Transmit( &cls.netchan, BF_GetNumBytesWritten( &buf ), BF_GetData( &buf ));
}
else
{
// increment sequence number so we can detect that we've held back packets.
cls.netchan.outgoing_sequence++;
}
if( cls.demorecording )
{
// Back up one because we've incremented outgoing_sequence each frame by 1 unit
cmdnumber = ( cls.netchan.outgoing_sequence - 1 ) & CL_UPDATE_MASK;
CL_WriteDemoUserCmd( cmdnumber );
}
// update download/upload slider.
Netchan_UpdateProgress( &cls.netchan );
}
/*
=======================
SV_SendClientMessages
=======================
*/
void SV_SendClientMessages( void )
{
sv_client_t *cl;
int i;
svs.currentPlayer = NULL;
svs.currentPlayerNum = 0;
if( sv.state == ss_dead )
return;
SV_UpdateToReliableMessages ();
// send a message to each connected client
for( i = 0, cl = svs.clients; i < sv_maxclients->integer; i++, cl++ )
{
if( !cl->state || cl->fakeclient )
continue;
if( cl->skip_message )
{
cl->skip_message = false;
continue;
}
if( !host_limitlocal->integer && NET_IsLocalAddress( cl->netchan.remote_address ))
cl->send_message = true;
if( cl->state == cs_spawned )
{
// Try to send a message as soon as we can.
// If the target time for sending is within the next frame interval ( based on last frame ),
// trigger the send now. Note that in single player,
// send_message is also set to true any time a packet arrives from the client.
float time_unti_next_message = cl->next_messagetime - (host.realtime + host.frametime);
if( time_unti_next_message <= 0.0f )
cl->send_message = true;
// something got hosed
if( time_unti_next_message > 2.0f )
cl->send_message = true;
}
// if the reliable message overflowed, drop the client
if( BF_CheckOverflow( &cl->netchan.message ))
{
BF_Clear( &cl->netchan.message );
BF_Clear( &cl->datagram );
SV_BroadcastPrintf( PRINT_HIGH, "%s overflowed\n", cl->name );
MsgDev( D_WARN, "reliable overflow for %s\n", cl->name );
SV_DropClient( cl );
cl->send_message = true;
cl->netchan.cleartime = 0; // don't choke this message
}
else if( cl->send_message )
{
// If we haven't gotten a message in sv_failuretime seconds, then stop sending messages to this client
// until we get another packet in from the client. This prevents crash/drop and reconnect where they are
// being hosed with "sequenced packet without connection" packets.
if(( host.realtime - cl->netchan.last_received ) > sv_failuretime->value )
cl->send_message = false;
}
// only send messages if the client has sent one
// and the bandwidth is not choked
if( !cl->send_message ) continue;
// Bandwidth choke active?
if( !Netchan_CanPacket( &cl->netchan ))
{
cl->chokecount++;
continue;
}
cl->send_message = false;
// Now that we were able to send, reset timer to point to next possible send time.
cl->next_messagetime = host.realtime + host.frametime + cl->cl_updaterate;
if( cl->state == cs_spawned )
{
SV_SendClientDatagram( cl );
}
else
{
// just update reliable
Netchan_Transmit( &cl->netchan, 0, NULL );
}
}
// reset current client
svs.currentPlayer = NULL;
svs.currentPlayerNum = 0;
}
/*
=======================
SV_UpdateToReliableMessages
=======================
*/
void SV_UpdateToReliableMessages( void )
{
int i;
sv_client_t *cl;
// check for changes to be sent over the reliable streams to all clients
for( i = 0, cl = svs.clients; i < sv_maxclients->integer; i++, cl++ )
{
if( !cl->edict ) continue; // not in game yet
if( cl->state != cs_spawned )
continue;
if( cl->sendinfo )
{
cl->sendinfo = false;
SV_FullClientUpdate( cl, &sv.reliable_datagram );
}
if( cl->sendmovevars )
{
cl->sendmovevars = false;
SV_FullUpdateMovevars( cl, &cl->netchan.message );
}
}
// 1% chanse for simulate random network bugs
if( sv.write_bad_message && Com_RandomLong( 0, 512 ) == 404 )
{
// just for network debugging (send only for local client)
BF_WriteByte( &sv.datagram, svc_bad );
BF_WriteLong( &sv.datagram, rand( )); // send some random data
BF_WriteString( &sv.datagram, host.finalmsg ); // send final message
sv.write_bad_message = false;
}
// clear the server datagram if it overflowed.
if( BF_CheckOverflow( &sv.datagram ))
{
MsgDev( D_ERROR, "sv.datagram overflowed!\n" );
BF_Clear( &sv.datagram );
}
// clear the server datagram if it overflowed.
if( BF_CheckOverflow( &sv.spectator_datagram ))
{
MsgDev( D_ERROR, "sv.spectator_datagram overflowed!\n" );
BF_Clear( &sv.spectator_datagram );
}
// now send the reliable and server datagrams to all clients.
for( i = 0, cl = svs.clients; i < sv_maxclients->integer; i++, cl++ )
{
if( cl->state < cs_connected || cl->fakeclient )
continue; // reliables go to all connected or spawned
BF_WriteBits( &cl->netchan.message, BF_GetData( &sv.reliable_datagram ), BF_GetNumBitsWritten( &sv.reliable_datagram ));
BF_WriteBits( &cl->datagram, BF_GetData( &sv.datagram ), BF_GetNumBitsWritten( &sv.datagram ));
if( cl->hltv_proxy )
{
BF_WriteBits( &cl->datagram, BF_GetData( &sv.spectator_datagram ), BF_GetNumBitsWritten( &sv.spectator_datagram ));
}
}
// now clear the reliable and datagram buffers.
BF_Clear( &sv.spectator_datagram );
BF_Clear( &sv.reliable_datagram );
BF_Clear( &sv.datagram );
}
/*
===============
Netchan_TransmitBits
tries to send an unreliable message to a connection, and handles the
transmition / retransmition of the reliable messages.
A 0 length will still generate a packet and deal with the reliable messages.
================
*/
void Netchan_TransmitBits( netchan_t *chan, int length, byte *data )
{
sizebuf_t send;
byte send_buf[NET_MAX_MESSAGE];
qboolean send_reliable_fragment;
qboolean send_resending = false;
qboolean send_reliable;
size_t size1, size2;
uint w1, w2, hdr_size;
int i, j;
float fRate;
// check for message overflow
// check for message overflow
if( BF_CheckOverflow( &chan->message ))
{
MsgDev( D_ERROR, "%s:outgoing message overflow\n", NET_AdrToString( chan->remote_address ));
return;
}
// if the remote side dropped the last reliable message, resend it
send_reliable = false;
if( chan->incoming_acknowledged > chan->last_reliable_sequence && chan->incoming_reliable_acknowledged != chan->reliable_sequence )
{
send_reliable = true;
send_resending = true;
}
// A packet can have "reliable payload + frag payload + unreliable payload
// frag payload can be a file chunk, if so, it needs to be parsed on the receiving end and reliable payload + unreliable payload need
// to be passed on to the message queue. The processing routine needs to be able to handle the case where a message comes in and a file
// transfer completes
// if the reliable transmit buffer is empty, copy the current message out
if( !chan->reliable_length )
{
qboolean send_frag = false;
fragbuf_t *pbuf;
// will be true if we are active and should let chan->message get some bandwidth
int send_from_frag[MAX_STREAMS] = { 0, 0 };
int send_from_regular = false;
// if we have data in the waiting list(s) and we have cleared the current queue(s), then
// push the waitlist(s) into the current queue(s)
Netchan_FragSend( chan );
// sending regular payload
send_from_regular = BF_GetNumBytesWritten( &chan->message ) ? 1 : 0;
// check to see if we are sending a frag payload
for( i = 0; i < MAX_STREAMS; i++ )
{
if( chan->fragbufs[i] )
{
send_from_frag[i] = 1;
}
}
// stall reliable payloads if sending from frag buffer
if( send_from_regular && ( send_from_frag[FRAG_NORMAL_STREAM] ))
{
send_from_regular = false;
// if the reliable buffer has gotten too big, queue it at the end of everything and clear out buffer
if( BF_GetNumBytesWritten( &chan->message ) > MAX_RELIABLE_PAYLOAD )
{
Netchan_CreateFragments(( chan->sock == NS_SERVER ), chan, &chan->message );
BF_Clear( &chan->message );
}
}
// startpos will be zero if there is no regular payload
for( i = 0; i < MAX_STREAMS; i++ )
{
chan->frag_startpos[i] = 0;
// assume no fragment is being sent
chan->reliable_fragment[i] = 0;
chan->reliable_fragid[i] = 0;
chan->frag_length[i] = 0;
if( send_from_frag[i] )
{
send_frag = true;
}
}
if( send_from_regular || send_frag )
{
chan->reliable_sequence ^= 1;
send_reliable = true;
}
if( send_from_regular )
{
Q_memcpy( chan->reliable_buf, chan->message_buf, BF_GetNumBytesWritten( &chan->message ));
chan->reliable_length = BF_GetNumBitsWritten( &chan->message );
BF_Clear( &chan->message );
// if we send fragments, this is where they'll start
for( i = 0; i < MAX_STREAMS; i++ )
{
chan->frag_startpos[i] = chan->reliable_length;
}
}
for( i = 0; i < MAX_STREAMS; i++ )
{
int fragment_size;
int newpayloadsize;
// is there someting in the fragbuf?
pbuf = chan->fragbufs[i];
fragment_size = 0;
if( pbuf )
{
fragment_size = BF_GetNumBytesWritten( &pbuf->frag_message );
// files set size a bit differently.
if( pbuf->isfile && !pbuf->isbuffer )
{
fragment_size = pbuf->size;
}
}
newpayloadsize = (( chan->reliable_length + ( fragment_size << 3 )) + 7 ) >> 3;
// make sure we have enought space left
if( send_from_frag[i] && pbuf && ( newpayloadsize < MAX_RELIABLE_PAYLOAD ))
{
sizebuf_t temp;
// which buffer are we sending ?
chan->reliable_fragid[i] = MAKE_FRAGID( pbuf->bufferid, chan->fragbufcount[i] );
// if it's not in-memory, then we'll need to copy it in frame the file handle.
if( pbuf->isfile && !pbuf->isbuffer )
{
byte filebuffer[2048];
file_t *hfile;
hfile = FS_Open( pbuf->filename, "rb", false );
FS_Seek( hfile, pbuf->foffset, SEEK_SET );
FS_Read( hfile, filebuffer, pbuf->size );
BF_WriteBits( &pbuf->frag_message, filebuffer, pbuf->size << 3 );
FS_Close( hfile );
}
// copy frag stuff on top of current buffer
BF_StartWriting( &temp, chan->reliable_buf, sizeof( chan->reliable_buf ), chan->reliable_length, -1 );
BF_WriteBits( &temp, BF_GetData( &pbuf->frag_message ), BF_GetNumBitsWritten( &pbuf->frag_message ));
chan->reliable_length += BF_GetNumBitsWritten( &pbuf->frag_message );
chan->frag_length[i] = BF_GetNumBitsWritten( &pbuf->frag_message );
// unlink pbuf
Netchan_UnlinkFragment( pbuf, &chan->fragbufs[i] );
chan->reliable_fragment[i] = 1;
// offset the rest of the starting positions
for( j = i + 1; j < MAX_STREAMS; j++ )
{
chan->frag_startpos[j] += chan->frag_length[i];
}
}
}
}
