make query_field_info return buffer length

ocgapi.cpp

@@ -291,18 +291,22 @@ extern "C" DECL_DLLEXPORT int32 query_field_info(ptr pduel, byte* buf) {
 	duel* ptduel = (duel*)pduel;
 	*buf++ = MSG_RELOAD_FIELD;
 	*buf++ = ptduel->game_field->core.duel_rule;
+	int32 ct = 0;
 	for(int playerid = 0; playerid < 2; ++playerid) {
 		auto& player = ptduel->game_field->player[playerid];
 		*((int*)(buf)) = player.lp;
 		buf += 4;
+		ct += 4;
 		for(auto cit = player.list_mzone.begin(); cit != player.list_mzone.end(); ++cit) {
 			card* pcard = *cit;
 			if(pcard) {
 				*buf++ = 1;
 				*buf++ = pcard->current.position;
 				*buf++ = pcard->xyz_materials.size();
+				ct += 3;
 			} else {
 				*buf++ = 0;
+				ct++;
 			}
 		}
 		for(auto cit = player.list_szone.begin(); cit != player.list_szone.end(); ++cit) {
@@ -310,8 +314,10 @@ extern "C" DECL_DLLEXPORT int32 query_field_info(ptr pduel, byte* buf) {
 			if(pcard) {
 				*buf++ = 1;
 				*buf++ = pcard->current.position;
+				ct += 2;
 			} else {
 				*buf++ = 0;
+				ct++;
 			}
 		}
 		*buf++ = player.list_main.size();
@@ -320,8 +326,10 @@ extern "C" DECL_DLLEXPORT int32 query_field_info(ptr pduel, byte* buf) {
 		*buf++ = player.list_remove.size();
 		*buf++ = player.list_extra.size();
 		*buf++ = player.extra_p_count;
+		ct += 6;
 	}
 	*buf++ = ptduel->game_field->core.current_chain.size();
+	ct++;
 	for(auto chit = ptduel->game_field->core.current_chain.begin(); chit != ptduel->game_field->core.current_chain.end(); ++chit) {
 		effect* peffect = chit->triggering_effect;
 		*((int*)(buf)) = peffect->get_handler()->data.code;
@@ -333,8 +341,9 @@ extern "C" DECL_DLLEXPORT int32 query_field_info(ptr pduel, byte* buf) {
 		*buf++ = chit->triggering_sequence;
 		*((int*)(buf)) = peffect->description;
 		buf += 4;
+		ct += 15;
 	}
-	return 0;
+	return ct;
 }
 extern "C" DECL_DLLEXPORT void set_responsei(ptr pduel, int32 value) {
 	((duel*)pduel)->set_responsei(value);