C++ MSG_WriteBits函数代码示例

/*
================
rvDebuggerServer::HandleInspectThreads

Send the list of the current threads in the interpreter back to the debugger client
================
*/
void rvDebuggerServer::HandleInspectThreads ( msg_t* in_msg )
{
	msg_t		 msg;
	byte		 buffer[MAX_MSGLEN];
	int			 i;

	// Initialize the message
	MSG_Init( &msg, buffer, sizeof( buffer ) );
	MSG_WriteShort ( &msg, (int)DBMSG_INSPECTTHREADS );	
	
	// Write the number of threads to the message
	MSG_WriteShort ( &msg, (int)idThread::GetThreads().Num() );

	// Loop through all of the threads and write their name and number to the message
	for ( i = 0; i < idThread::GetThreads().Num(); i ++ )
	{
		idThread* thread = idThread::GetThreads()[i];
	
		MSG_WriteString ( &msg, thread->GetThreadName ( ) );
		MSG_WriteLong ( &msg, thread->GetThreadNum ( ) );
		
		MSG_WriteBits ( &msg, (int)(thread == mBreakInterpreter->GetThread ( )), 1 );	
		MSG_WriteBits ( &msg, (int)thread->IsDoneProcessing(), 1 );
		MSG_WriteBits ( &msg, (int)thread->IsWaiting(), 1 );
		MSG_WriteBits ( &msg, (int)thread->IsDying(), 1 );
	}

	// Send off the inspect threads packet to the debugger client
	SendPacket ( msg.data, msg.cursize );
}

void MSG_WriteDelta( msg_t *msg, int oldV, int newV, int bits ) {
	if ( oldV == newV ) {
		MSG_WriteBits( msg, 0, 1 );
		return;
	}
	MSG_WriteBits( msg, 1, 1 );
	MSG_WriteBits( msg, newV, bits );
}

void MSG_WriteDeltaFloat( msg_t *msg, float oldV, float newV ) {
	if ( oldV == newV ) {
		MSG_WriteBits( msg, 0, 1 );
		return;
	}
	MSG_WriteBits( msg, 1, 1 );
	MSG_WriteBits( msg, *(int *)&newV, 32 );
}

void MSG_WriteDeltaFloat( msg_t *msg, float oldV, float newV ) {
	byteAlias_t fi;
	if ( oldV == newV ) {
		MSG_WriteBits( msg, 0, 1 );
		return;
	}
	fi.f = newV;
	MSG_WriteBits( msg, 1, 1 );
	MSG_WriteBits( msg, fi.i, 32 );
}

static void demoFramePack( msg_t *msg, const demoFrame_t *newFrame, const demoFrame_t *oldFrame ) {
	int i;
	/* Full or delta frame marker */
	MSG_WriteBits( msg, oldFrame ? 0 : 1, 1 );
	MSG_WriteLong( msg, newFrame->serverTime );
	/* Add the config strings */
	for (i = 0;i<MAX_CONFIGSTRINGS;i++) {
		const char *oldString = !oldFrame ? "" : &oldFrame->string.data[oldFrame->string.offsets[i]];
		const char *newString = newFrame->string.data + newFrame->string.offsets[i];
		if (strcmp( oldString, newString)) {
			MSG_WriteShort( msg, i );
			MSG_WriteBigString( msg, newString );
		}
	}
	MSG_WriteShort( msg, MAX_CONFIGSTRINGS );
	/* Add the playerstates */
	for (i=0; i<MAX_CLIENTS; i++) {
		const playerState_t *oldPlayer, *newPlayer;
		if (!newFrame->clientData[i])
			continue;
		oldPlayer = (!oldFrame || !oldFrame->clientData[i]) ? &demoNullPlayerState : &oldFrame->clients[i];
		newPlayer = &newFrame->clients[i];
		MSG_WriteByte( msg, i );
		MSG_WriteDeltaPlayerstate( msg, oldPlayer, newPlayer );
	}
	MSG_WriteByte( msg, MAX_CLIENTS );
	/* Add the entities */
	for (i=0; i<MAX_GENTITIES-1; i++) {
		const entityState_t *oldEntity, *newEntity;
		newEntity = &newFrame->entities[i];
		if (oldFrame) {
			oldEntity = &oldFrame->entities[i];
			if (oldEntity->number == (MAX_GENTITIES -1))
				oldEntity = 0;
		} else {
			oldEntity = 0;
		}
		if (newEntity->number != i || newEntity->number >= (MAX_GENTITIES -1)) {
			newEntity = 0;
		} else {
			if (!oldEntity) {
				oldEntity = &demoNullEntityState;
			}
		}
		MSG_WriteDeltaEntity( msg, oldEntity, newEntity, qfalse );
	}
	MSG_WriteBits( msg, (MAX_GENTITIES-1), GENTITYNUM_BITS );
	/* Add the area mask */
	MSG_WriteByte( msg, newFrame->areaUsed );
	MSG_WriteData( msg, newFrame->areamask, newFrame->areaUsed );
	/* Add the command string data */
	MSG_WriteLong( msg, newFrame->commandUsed );
	MSG_WriteData( msg, newFrame->commandData, newFrame->commandUsed );
}

/*
=============
SV_EmitPacketEntities

Writes a delta update of an entityState_t list to the message.
=============
*/
static void SV_EmitPacketEntities( clientSnapshot_t *from, clientSnapshot_t *to, msg_t *msg ) {
	entityState_t	*oldent, *newent;
	int		oldindex, newindex;
	int		oldnum, newnum;
	int		from_num_entities;

	// generate the delta update
	if ( !from ) {
		from_num_entities = 0;
	} else {
		from_num_entities = from->num_entities;
	}

	newent = NULL;
	oldent = NULL;
	newindex = 0;
	oldindex = 0;
	while ( newindex < to->num_entities || oldindex < from_num_entities ) {
		if ( newindex >= to->num_entities ) {
			newnum = 9999;
		} else {
			newent = &svs.snapshotEntities[(to->first_entity+newindex) % svs.numSnapshotEntities];
			newnum = newent->number;
		}

		if ( oldindex >= from_num_entities ) {
			oldnum = 9999;
		} else {
			oldent = &svs.snapshotEntities[(from->first_entity+oldindex) % svs.numSnapshotEntities];
			oldnum = oldent->number;
		}

		if ( newnum == oldnum ) {
			// delta update from old position
			// because the force parm is qfalse, this will not result
			// in any bytes being emited if the entity has not changed at all
			MSG_WriteDeltaEntity (msg, oldent, newent, qfalse );
			oldindex++;
			newindex++;
			continue;
		}

		if ( newnum < oldnum ) {
			// this is a new entity, send it from the baseline
			MSG_WriteDeltaEntity (msg, &sv.svEntities[newnum].baseline, newent, qtrue );
			newindex++;
			continue;
		}

		if ( newnum > oldnum ) {
			// the old entity isn't present in the new message
			MSG_WriteDeltaEntity (msg, oldent, NULL, qtrue );
			oldindex++;
			continue;
		}
	}

	MSG_WriteBits( msg, (MAX_GENTITIES-1), GENTITYNUM_BITS );	// end of packetentities
}

/*
=============
SV_EmitPacketEntities

Writes a delta update of an entity_state_t list to the message->
=============
*/
void SV_EmitPacketEntities( client_frame_t *from, client_frame_t *to, sizebuf_t *msg )
{
	entity_state_t	*oldent, *newent;
	int		oldindex, newindex;
	int		oldnum, newnum;
	int		from_num_entities;

	MSG_WriteByte( msg, svc_packetentities );

	if( !from ) from_num_entities = 0;
	else from_num_entities = from->num_entities;

	newent = NULL;
	oldent = NULL;
	newindex = 0;
	oldindex = 0;
	while( newindex < to->num_entities || oldindex < from_num_entities )
	{
		if( newindex >= to->num_entities ) newnum = MAX_ENTNUMBER;
		else
		{
			newent = &svs.client_entities[(to->first_entity+newindex)%svs.num_client_entities];
			newnum = newent->number;
		}

		if( oldindex >= from_num_entities ) oldnum = MAX_ENTNUMBER;
		else
		{
			oldent = &svs.client_entities[(from->first_entity+oldindex)%svs.num_client_entities];
			oldnum = oldent->number;
		}

		if( newnum == oldnum )
		{	
			// delta update from old position
			// because the force parm is false, this will not result
			// in any bytes being emited if the entity has not changed at all
			MSG_WriteDeltaEntity( oldent, newent, msg, false, ( newent->number <= sv_maxclients->integer ));
			oldindex++;
			newindex++;
			continue;
		}
		if( newnum < oldnum )
		{	
			// this is a new entity, send it from the baseline
			MSG_WriteDeltaEntity( &svs.baselines[newnum], newent, msg, true, true );
			newindex++;
			continue;
		}
		if( newnum > oldnum )
		{	
			// remove from message
			MSG_WriteDeltaEntity( oldent, NULL, msg, false, false );
			oldindex++;
			continue;
		}
	}
	MSG_WriteBits( msg, 0, "svc_packetentities", NET_WORD ); // end of packetentities
}

void MSG_WriteDeltaEntity( msg_t *msg, struct entityState_s *from, struct entityState_s *to, 
						   qboolean force ) {
	int			c;
	int			i;
	const netField_t	*field;
	int			*fromF, *toF;
	int			blah;
	bool		stuffChanged = false;
	const int numFields = sizeof(entityStateFields)/sizeof(entityStateFields[0]);
	byte		changeVector[(numFields/8) + 1];


	// all fields should be 32 bits to avoid any compiler packing issues
	// the "number" field is not part of the field list
	// if this assert fails, someone added a field to the entityState_t
	// struct without updating the message fields
	blah = sizeof( *from );
	assert( numFields + 1 == blah/4); 

	c = msg->cursize;

	// a NULL to is a delta remove message
	if ( to == NULL ) {
		if ( from == NULL ) {
			return;
		}
		MSG_WriteBits( msg, from->number, GENTITYNUM_BITS );
		MSG_WriteBits( msg, 1, 1 );
		return;
	}

	if ( to->number < 0 || to->number >= MAX_GENTITIES ) {
		Com_Error (ERR_FATAL, "MSG_WriteDeltaEntity: Bad entity number: %i", to->number );
	}

	memset(changeVector, 0, sizeof(changeVector));

	// build the change vector as bytes so it is endien independent
	for ( i = 0, field = entityStateFields ; i < numFields ; i++, field++ ) {
		fromF = (int *)( (byte *)from + field->offset );
		toF = (int *)( (byte *)to + field->offset );
		if ( *fromF != *toF ) {
			changeVector[ i>>3 ] |= 1 << ( i & 7 );
			stuffChanged = true;
		}
	}

void MSG_WriteShort( msg_t *sb, int c ) {
#ifdef PARANOID
	if (c < ((short)0x8000) || c > (short)0x7fff)
		Com_Error (ERR_FATAL, "MSG_WriteShort: range error");
#endif

	MSG_WriteBits( sb, c, 16 );
}

void MSG_WriteByte( msg_t *sb, int c ) {
#ifdef PARANOID
	if (c < 0 || c > 255)
		Com_Error (ERR_FATAL, "MSG_WriteByte: range error");
#endif

	MSG_WriteBits( sb, c, 8 );
}

void MSG_WriteField (msg_t *msg, const int *toF, const netField_t *field)
{
	int			trunc;
	float		fullFloat;

	if ( field->bits == -1)
	{	// a -1 in the bits field means it's a float that's always between -1 and 1
		int temp = *(float *)toF * 32767;
 		MSG_WriteBits( msg, temp, -16 );
	}
	else
 	if ( field->bits == 0 ) {
 		// float
 		fullFloat = *(float *)toF;
 		trunc = (int)fullFloat;

		if (fullFloat == 0.0f) {
			MSG_WriteBits( msg, 0, 1 );	//it's a zero
		} else {
			MSG_WriteBits( msg, 1, 1 );	//not a zero
			if ( trunc == fullFloat && trunc + FLOAT_INT_BIAS >= 0 && 
				trunc + FLOAT_INT_BIAS < ( 1 << FLOAT_INT_BITS ) ) {
				// send as small integer
				MSG_WriteBits( msg, 0, 1 );
				MSG_WriteBits( msg, trunc + FLOAT_INT_BIAS, FLOAT_INT_BITS );
			} else {
				// send as full floating point value
				MSG_WriteBits( msg, 1, 1 );
				MSG_WriteBits( msg, *toF, 32 );
			}
		}
 	} else {
		if (*toF == 0) {
			MSG_WriteBits( msg, 0, 1 );	//it's a zero
		} else {
			MSG_WriteBits( msg, 1, 1 );	//not a zero
			// integer
			MSG_WriteBits( msg, *toF, field->bits );
		}
 	}
}

/*
================
rvDebuggerClient::SendAddBreakpoint

Send an individual breakpoint over to the debugger server
================
*/
void rvDebuggerClient::SendAddBreakpoint(rvDebuggerBreakpoint &bp, bool onceOnly)
{
	msg_t	 msg;
	byte	 buffer[MAX_MSGLEN];

	if (!mConnected) {
		return;
	}

	MSG_Init(&msg, buffer, sizeof(buffer));
	MSG_WriteShort(&msg, (int)DBMSG_ADDBREAKPOINT);
	MSG_WriteBits(&msg, onceOnly?1:0, 1);
	MSG_WriteLong(&msg, (unsigned long) bp.GetLineNumber());
	MSG_WriteLong(&msg, bp.GetID());
	MSG_WriteString(&msg, bp.GetFilename());

	SendPacket(msg.data, msg.cursize);
}

/*
==================
SV_WriteVoipToClient

Check to see if there is any VoIP queued for a client, and send if there is.
==================
*/
static void SV_WriteVoipToClient( client_t* cl, msg_s* msg )
{
	int totalbytes = 0;
	int i;
	voipServerPacket_t* packet;
	
	if ( cl->queuedVoipPackets )
	{
		// Write as many VoIP packets as we reasonably can...
		for ( i = 0; i < cl->queuedVoipPackets; i++ )
		{
			packet = cl->voipPacket[( i + cl->queuedVoipIndex ) % ARRAY_LEN( cl->voipPacket )];
			
			if ( !*cl->downloadName )
			{
				totalbytes += packet->len;
				if ( totalbytes > ( msg->maxsize - msg->cursize ) / 2 )
					break;
					
				MSG_WriteByte( msg, svc_voip );
				MSG_WriteShort( msg, packet->sender );
				MSG_WriteByte( msg, ( byte ) packet->generation );
				MSG_WriteLong( msg, packet->sequence );
				MSG_WriteByte( msg, packet->frames );
				MSG_WriteShort( msg, packet->len );
				MSG_WriteBits( msg, packet->flags, VOIP_FLAGCNT );
				MSG_WriteData( msg, packet->data, packet->len );
			}
			
			free( packet );
		}
		
		cl->queuedVoipPackets -= i;
		cl->queuedVoipIndex += i;
		cl->queuedVoipIndex %= ARRAY_LEN( cl->voipPacket );
	}
}

void EXT_FUNC MSG_WriteBits_api(uint32 data, int numbits) {
	MSG_WriteBits(data, numbits);
}

//.........这里部分代码省略.........
	}

#ifdef USE_VOIP
	if (clc.voipOutgoingDataSize > 0)
	{
		if((clc.voipFlags & VOIP_SPATIAL) || Com_IsVoipTarget(clc.voipTargets, sizeof(clc.voipTargets), -1))
		{
			MSG_WriteByte (&buf, clc_voip);
			MSG_WriteByte (&buf, clc.voipOutgoingGeneration);
			MSG_WriteLong (&buf, clc.voipOutgoingSequence);
			MSG_WriteByte (&buf, clc.voipOutgoingDataFrames);
			MSG_WriteData (&buf, clc.voipTargets, sizeof(clc.voipTargets));
			MSG_WriteByte(&buf, clc.voipFlags);
			MSG_WriteShort (&buf, clc.voipOutgoingDataSize);
			MSG_WriteData (&buf, clc.voipOutgoingData, clc.voipOutgoingDataSize);

			// If we're recording a demo, we have to fake a server packet with
			//  this VoIP data so it gets to disk; the server doesn't send it
			//  back to us, and we might as well eliminate concerns about dropped
			//  and misordered packets here.
			if(clc.demorecording && !clc.demowaiting)
			{
				const int voipSize = clc.voipOutgoingDataSize;
				msg_t fakemsg;
				byte fakedata[MAX_MSGLEN];
				MSG_Init (&fakemsg, fakedata, sizeof (fakedata));
				MSG_Bitstream (&fakemsg);
				MSG_WriteLong (&fakemsg, clc.reliableAcknowledge);
				MSG_WriteByte (&fakemsg, svc_voip);
				MSG_WriteShort (&fakemsg, clc.clientNum);
				MSG_WriteByte (&fakemsg, clc.voipOutgoingGeneration);
				MSG_WriteLong (&fakemsg, clc.voipOutgoingSequence);
				MSG_WriteByte (&fakemsg, clc.voipOutgoingDataFrames);
				MSG_WriteShort (&fakemsg, clc.voipOutgoingDataSize );
				MSG_WriteBits (&fakemsg, clc.voipFlags, VOIP_FLAGCNT);
				MSG_WriteData (&fakemsg, clc.voipOutgoingData, voipSize);
				MSG_WriteByte (&fakemsg, svc_EOF);
				CL_WriteDemoMessage (&fakemsg, 0);
			}

			clc.voipOutgoingSequence += clc.voipOutgoingDataFrames;
			clc.voipOutgoingDataSize = 0;
			clc.voipOutgoingDataFrames = 0;
		}
		else
		{
			// We have data, but no targets. Silently discard all data
			clc.voipOutgoingDataSize = 0;
			clc.voipOutgoingDataFrames = 0;
		}
	}
#endif

	if ( count >= 1 ) {
		if ( cl_showSend->integer ) {
			Com_Printf( "(%i)", count );
		}

		// begin a client move command
		if ( cl_nodelta->integer || !cl.snap.valid || clc.demowaiting
			|| clc.serverMessageSequence != cl.snap.messageNum ) {
			MSG_WriteByte (&buf, clc_moveNoDelta);
		} else {
			MSG_WriteByte (&buf, clc_move);
		}

		// write the command count
		MSG_WriteByte( &buf, count );

		// use the checksum feed in the key
		key = clc.checksumFeed;
		// also use the message acknowledge
		key ^= clc.serverMessageSequence;
		// also use the last acknowledged server command in the key
		key ^= MSG_HashKey(clc.serverCommands[ clc.serverCommandSequence & (MAX_RELIABLE_COMMANDS-1) ], 32);

		// write all the commands, including the predicted command
		for ( i = 0 ; i < count ; i++ ) {
			j = (cl.cmdNumber - count + i + 1) & CMD_MASK;
			cmd = &cl.cmds[j];
			MSG_WriteDeltaUsercmdKey (&buf, key, oldcmd, cmd);
			oldcmd = cmd;
		}
	}

	//
	// deliver the message
	//
	packetNum = clc.netchan.outgoingSequence & PACKET_MASK;
	cl.outPackets[ packetNum ].p_realtime = cls.realtime;
	cl.outPackets[ packetNum ].p_serverTime = oldcmd->serverTime;
	cl.outPackets[ packetNum ].p_cmdNumber = cl.cmdNumber;
	clc.lastPacketSentTime = cls.realtime;

	if ( cl_showSend->integer ) {
		Com_Printf( "%i ", buf.cursize );
	}

	CL_Netchan_Transmit (&clc.netchan, &buf);	
}