C++ BF_WriteByte函數代碼示例

/*
==================
SV_FinalMessage

Used by SV_Shutdown to send a final message to all
connected clients before the server goes down.  The messages are sent immediately,
not just stuck on the outgoing message list, because the server is going
to totally exit after returning from this function.
==================
*/
void SV_FinalMessage( char *message, qboolean reconnect )
{
	sv_client_t	*cl;
	byte		msg_buf[1024];
	sizebuf_t		msg;
	int		i;
	
	BF_Init( &msg, "FinalMessage", msg_buf, sizeof( msg_buf ));
	BF_WriteByte( &msg, svc_print );
	BF_WriteByte( &msg, PRINT_HIGH );
	BF_WriteString( &msg, va( "%s\n", message ));

	if( reconnect )
	{
		BF_WriteByte( &msg, svc_changing );

		if( sv.loadgame || sv_maxclients->integer > 1 || sv.changelevel )
			BF_WriteOneBit( &msg, 1 ); // changelevel
		else BF_WriteOneBit( &msg, 0 );
	}
	else
	{
		BF_WriteByte( &msg, svc_disconnect );
	}

	// send it twice
	// stagger the packets to crutch operating system limited buffers
	for( i = 0, cl = svs.clients; i < sv_maxclients->integer; i++, cl++ )
		if( cl->state >= cs_connected && !cl->fakeclient )
			Netchan_Transmit( &cl->netchan, BF_GetNumBytesWritten( &msg ), BF_GetData( &msg ));

	for( i = 0, cl = svs.clients; i < sv_maxclients->integer; i++, cl++ )
		if( cl->state >= cs_connected && !cl->fakeclient )
			Netchan_Transmit( &cl->netchan, BF_GetNumBytesWritten( &msg ), BF_GetData( &msg ));
}

/*
=================
SV_BroadcastPrintf

Sends text to all active clients
=================
*/
void SV_BroadcastPrintf( int level, char *fmt, ... )
{
	char		string[MAX_SYSPATH];
	va_list		argptr;
	sv_client_t	*cl;
	int		i;

	if( !sv.state ) return;

	va_start( argptr, fmt );
	Q_vsprintf( string, fmt, argptr );
	va_end( argptr );
	
	// echo to console
	if( host.type == HOST_DEDICATED ) Msg( "%s", string );

	for( i = 0, cl = svs.clients; i < sv_maxclients->integer; i++, cl++ )
	{
		if( level < cl->messagelevel ) continue;
		if( cl->state != cs_spawned ) continue;
		if( cl->fakeclient ) continue;

		BF_WriteByte( &cl->netchan.message, svc_print );
		BF_WriteByte( &cl->netchan.message, level );
		BF_WriteString( &cl->netchan.message, string );
	}
}

/*
=======================
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 ));
}

/*
===================
Cmd_ForwardToServer

adds the current command line as a clc_stringcmd to the client message.
things like godmode, noclip, etc, are commands directed to the server,
so when they are typed in at the console, they will need to be forwarded.
===================
*/
void Cmd_ForwardToServer( void )
{
	char	str[MAX_CMD_BUFFER];
	
	if( cls.demoplayback )
	{
		if( !Q_stricmp( Cmd_Argv( 0 ), "pause" ))
			cl.refdef.paused ^= 1;
		return;
	}

	if( cls.state != ca_connected && cls.state != ca_active )
	{
		MsgDev( D_INFO, "Can't \"%s\", not connected\n", Cmd_Argv( 0 ));
		return; // not connected
	}

	BF_WriteByte( &cls.netchan.message, clc_stringcmd );

	str[0] = 0;
	if( Q_stricmp( Cmd_Argv( 0 ), "cmd" ))
	{
		Q_strcat( str, Cmd_Argv( 0 ));
		Q_strcat( str, " " );
	}
	
	if( Cmd_Argc() > 1 )
		Q_strcat( str, Cmd_Args( ));
	else Q_strcat( str, "\n" );

	BF_WriteString( &cls.netchan.message, str );
}

/*
==============
CL_ParseResourceList

==============
*/
void CL_ParseResourceList( sizebuf_t *msg )
{
	int	i = 0;

	Q_memset( &reslist, 0, sizeof( resourcelist_t ));

	reslist.rescount = BF_ReadWord( msg ) - 1;

	for( i = 0; i < reslist.rescount; i++ )
	{
		reslist.restype[i] = BF_ReadWord( msg );
		Q_strncpy( reslist.resnames[i], BF_ReadString( msg ), CS_SIZE );
	}

	cls.downloadcount = 0;

	for( i = 0; i < reslist.rescount; i++ )
	{
		if( reslist.restype[i] == t_sound )
			CL_CheckingSoundResFile( reslist.resnames[i] );
		else CL_CheckingResFile( reslist.resnames[i] );
	}

	if( !cls.downloadcount )
	{
		BF_WriteByte( &cls.netchan.message, clc_stringcmd );
		BF_WriteString( &cls.netchan.message, "continueloading" );
	}
}

/*
=============================================================================

movevars_t communication

=============================================================================
*/
qboolean MSG_WriteDeltaMovevars( sizebuf_t *msg, movevars_t *from, movevars_t *to )
{
	delta_t		*pField;
	delta_info_t	*dt;
	int		i, startBit;
	int		numChanges = 0;

	dt = Delta_FindStruct( "movevars_t" );
	ASSERT( dt && dt->bInitialized );

	pField = dt->pFields;
	ASSERT( pField );

	startBit = msg->iCurBit;

	// activate fields and call custom encode func
	Delta_CustomEncode( dt, from, to );

	BF_WriteByte( msg, svc_deltamovevars );

	// process fields
	for( i = 0; i < dt->numFields; i++, pField++ )
	{
		if( Delta_WriteField( msg, pField, from, to, 0.0f ))
			numChanges++;
	}

	// if we have no changes - kill the message
	if( !numChanges )
	{
		BF_SeekToBit( msg, startBit );
		return false;
	}
	return true;
}

/*
==============
CL_CheckingResFile

==============
*/
void CL_CheckingResFile( char *pResFileName )
{
	sizebuf_t	buf;
	byte	data[32];

	if( FS_FileExists( pResFileName, false ))
		return;	// already exists

	cls.downloadcount++;

	
	if( cl_allow_fragment->integer )
	{
		Msg( "Starting file download: %s\n", pResFileName );
		if( cls.state == ca_disconnected ) return;

		BF_Init( &buf, "ClientPacket", data, sizeof( data ));
		BF_WriteByte( &buf, clc_resourcelist );
		BF_WriteString( &buf, pResFileName );

		if( !cls.netchan.remote_address.type )	// download in singleplayer ???
			cls.netchan.remote_address.type = NA_LOOPBACK;

		// make sure message will be delivered
		Netchan_Transmit( &cls.netchan, BF_GetNumBytesWritten( &buf ), BF_GetData( &buf ));
	}
	else
	HTTP_AddDownload( pResFileName, -1, true );

}

/*
=================
SV_ClientPrintf

Sends text across to be displayed if the level passes
=================
*/
void SV_ClientPrintf( sv_client_t *cl, int level, char *fmt, ... )
{
	va_list	argptr;
	char	string[MAX_SYSPATH];

	if( level < cl->messagelevel || cl->fakeclient )
		return;
	
	va_start( argptr, fmt );
	Q_vsprintf( string, fmt, argptr );
	va_end( argptr );
	
	BF_WriteByte( &cl->netchan.message, svc_print );
	BF_WriteByte( &cl->netchan.message, level );
	BF_WriteString( &cl->netchan.message, string );
}

/*
=============
SV_EmitPings

=============
*/
void SV_EmitPings( sizebuf_t *msg )
{
	sv_client_t	*cl;
	int		packet_loss;
	int		i, ping;

	BF_WriteByte( msg, svc_updatepings );

	for( i = 0, cl = svs.clients; i < sv_maxclients->integer; i++, cl++ )
	{
		if( cl->state != cs_spawned )
			continue;

		SV_GetPlayerStats( cl, &ping, &packet_loss );

		// there are 25 bits for each client
		BF_WriteOneBit( msg, 1 );
		BF_WriteUBitLong( msg, i, MAX_CLIENT_BITS );
		BF_WriteUBitLong( msg, ping, 12 );
		BF_WriteUBitLong( msg, packet_loss, 7 );
	}

	// end marker
	BF_WriteOneBit( msg, 0 );
}

/*
==============
CL_ParseCvarValue

Find the client cvar value
and sent it back to the server
==============
*/
void CL_ParseCvarValue( sizebuf_t *msg )
{
	const char *cvarName = BF_ReadString( msg );
	convar_t *cvar = Cvar_FindVar( cvarName );

	// build the answer
	BF_WriteByte( &cls.netchan.message, clc_requestcvarvalue );
	BF_WriteString( &cls.netchan.message, cvar ? cvar->string : "Not Found" );
}

static void pfnParticle( float *origin, int color, float life, int zpos, int zvel )
{
    int	v;

    if( !origin )
    {
        MsgDev( D_ERROR, "SV_StartParticle: NULL origin. Ignored\n" );
        return;
    }

    BF_WriteByte( &sv.reliable_datagram, svc_particle );
    BF_WriteVec3Coord( &sv.reliable_datagram, origin );
    BF_WriteChar( &sv.reliable_datagram, 0 ); // no x-vel
    BF_WriteChar( &sv.reliable_datagram, 0 ); // no y-vel
    v = bound( -128, (zpos * zvel) * 16.0f, 127 );
    BF_WriteChar( &sv.reliable_datagram, v ); // write z-vel
    BF_WriteByte( &sv.reliable_datagram, 1 );
    BF_WriteByte( &sv.reliable_datagram, color );
    BF_WriteByte( &sv.reliable_datagram, bound( 0, life * 8, 255 ));
}

void pfnUpdateServerInfo( const char *szKey, const char *szValue, const char *unused, void *unused2 )
{
	convar_t	*cv = Cvar_FindVar( szKey );

	if( !cv || !cv->modified ) return; // this cvar not changed

	BF_WriteByte( &sv.reliable_datagram, svc_serverinfo );
	BF_WriteString( &sv.reliable_datagram, szKey );
	BF_WriteString( &sv.reliable_datagram, szValue );
	cv->modified = false; // reset state
}

/*
=================
CL_Precache_f

The server will send this command right
before allowing the client into the server
=================
*/
void CL_Precache_f( void )
{
	int	spawncount;

	spawncount = Q_atoi( Cmd_Argv( 1 ));

	CL_PrepSound();
	CL_PrepVideo();

	BF_WriteByte( &cls.netchan.message, clc_stringcmd );
	BF_WriteString( &cls.netchan.message, va( "begin %i\n", spawncount ));
}

/*
=================
SV_BroadcastCommand

Sends text to all active clients
=================
*/
void SV_BroadcastCommand( char *fmt, ... )
{
	va_list	argptr;
	char	string[MAX_SYSPATH];
	
	if( !sv.state ) return;
	va_start( argptr, fmt );
	Q_vsprintf( string, fmt, argptr );
	va_end( argptr );

	BF_WriteByte( &sv.reliable_datagram, svc_stufftext );
	BF_WriteString( &sv.reliable_datagram, string );
}

/*
====================
CL_ProcessFile

A file has been received via the fragmentation/reassembly layer, put it in the right spot and
 see if we have finished downloading files.
====================
*/
void CL_ProcessFile( BOOL successfully_received, const char *filename )
{
	MsgDev( D_INFO, "Received %s, but file processing is not hooked up!!!\n", filename );

	if( cls.downloadfileid == cls.downloadcount - 1 )
	{
		MsgDev( D_INFO, "All Files downloaded\n" );

		BF_WriteByte( &cls.netchan.message, clc_stringcmd );
		BF_WriteString( &cls.netchan.message, "continueloading" );
	}

	cls.downloadfileid++;
}