Function MSG_WriteDeltaEntity

code/qcommon/msg.cpp:721–803

*/
#if 0 // Removed by BTO (VV)
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;
		}
	}

	if ( stuffChanged )
	{
		MSG_WriteBits( msg, to->number, GENTITYNUM_BITS );
		MSG_WriteBits( msg, 0, 1 );			// not removed
		MSG_WriteBits( msg, 1, 1 );			// we have a delta

		// we need to write the entire delta
		for ( i = 0 ; i + 8 <= numFields ; i += 8 ) {
			MSG_WriteByte( msg, changeVector[i>>3] );
		}
		if ( numFields & 7 ) {