Add: Houses can accept up to 16 different cargo types via NewGRF.

New Action0 property 23 for feature 07, variable length, format B n*(B B). Initial byte is number of structures following. First byte in structure is cargo id, second is acceptance level in 1/8 units.

src/house.h

@@ -31,6 +31,8 @@ static const HouseID NEW_HOUSE_OFFSET = 110;    ///< Offset for new houses.
 static const HouseID NUM_HOUSES       = 512;    ///< Total number of houses.
 static const HouseID INVALID_HOUSE_ID = 0xFFFF;
 
+static const uint HOUSE_NUM_ACCEPTS = 16; ///< Max number of cargoes accepted by a tile
+
 /**
  * There can only be as many classes as there are new houses, plus one for
  * NO_CLASS, as the original houses don't have classes.
@@ -97,30 +99,30 @@ DECLARE_ENUM_AS_BIT_SET(HouseExtraFlags)
 
 struct HouseSpec {
 	/* Standard properties */
-	Year min_year;                     ///< introduction year of the house
+	Year min_year;                            ///< introduction year of the house
-	Year max_year;                     ///< last year it can be built
+	Year max_year;                            ///< last year it can be built
-	byte population;                   ///< population (Zero on other tiles in multi tile house.)
+	byte population;                          ///< population (Zero on other tiles in multi tile house.)
-	byte removal_cost;                 ///< cost multiplier for removing it
+	byte removal_cost;                        ///< cost multiplier for removing it
-	StringID building_name;            ///< building name
+	StringID building_name;                   ///< building name
-	uint16 remove_rating_decrease;     ///< rating decrease if removed
+	uint16 remove_rating_decrease;            ///< rating decrease if removed
-	byte mail_generation;              ///< mail generation multiplier (tile based, as the acceptances below)
+	byte mail_generation;                     ///< mail generation multiplier (tile based, as the acceptances below)
-	byte cargo_acceptance[3];          ///< acceptance level for the cargo slots
+	byte cargo_acceptance[HOUSE_NUM_ACCEPTS]; ///< acceptance level for the cargo slots
-	CargoID accepts_cargo[3];          ///< 3 input cargo slots
+	CargoID accepts_cargo[HOUSE_NUM_ACCEPTS]; ///< input cargo slots
-	BuildingFlags building_flags;      ///< some flags that describe the house (size, stadium etc...)
+	BuildingFlags building_flags;             ///< some flags that describe the house (size, stadium etc...)
-	HouseZones building_availability;  ///< where can it be built (climates, zones)
+	HouseZones building_availability;         ///< where can it be built (climates, zones)
-	bool enabled;                      ///< the house is available to build (true by default, but can be disabled by newgrf)
+	bool enabled;                             ///< the house is available to build (true by default, but can be disabled by newgrf)
 
 	/* NewHouses properties */
-	GRFFileProps grf_prop;             ///< Properties related the the grf file
+	GRFFileProps grf_prop;                    ///< Properties related the the grf file
-	uint16 callback_mask;              ///< Bitmask of house callbacks that have to be called
+	uint16 callback_mask;                     ///< Bitmask of house callbacks that have to be called
-	byte random_colour[4];             ///< 4 "random" colours
+	byte random_colour[4];                    ///< 4 "random" colours
-	byte probability;                  ///< Relative probability of appearing (16 is the standard value)
+	byte probability;                         ///< Relative probability of appearing (16 is the standard value)
-	HouseExtraFlags extra_flags;       ///< some more flags
+	HouseExtraFlags extra_flags;              ///< some more flags
-	HouseClassID class_id;             ///< defines the class this house has (not grf file based)
+	HouseClassID class_id;                    ///< defines the class this house has (not grf file based)
-	AnimationInfo animation;           ///< information about the animation.
+	AnimationInfo animation;                  ///< information about the animation.
-	byte processing_time;              ///< Periodic refresh multiplier
+	byte processing_time;                     ///< Periodic refresh multiplier
-	byte minimum_life;                 ///< The minimum number of years this house will survive before the town rebuilds it
+	byte minimum_life;                        ///< The minimum number of years this house will survive before the town rebuilds it
-	CargoTypes watched_cargoes;        ///< Cargo types watched for acceptance.
+	CargoTypes watched_cargoes;               ///< Cargo types watched for acceptance.
 
 	Money GetRemovalCost() const;
 

src/newgrf.cpp

@@ -2294,6 +2294,10 @@ static ChangeInfoResult IgnoreTownHouseProperty(int prop, ByteReader *buf)
 			break;
 		}
 
+		case 0x23:
+			buf->Skip(buf->ReadByte() * 2);
+			break;
+
 		default:
 			ret = CIR_UNKNOWN;
 			break;
@@ -2526,6 +2530,28 @@ static ChangeInfoResult TownHouseChangeInfo(uint hid, int numinfo, int prop, Byt
 				housespec->max_year = buf->ReadWord();
 				break;
 
+			case 0x23: { // variable length cargo types accepted
+				uint count = buf->ReadByte();
+				if (count > lengthof(housespec->accepts_cargo)) {
+					GRFError *error = DisableGrf(STR_NEWGRF_ERROR_LIST_PROPERTY_TOO_LONG);
+					error->param_value[1] = prop;
+					return CIR_DISABLED;
+				}
+				/* Always write the full accepts_cargo array, and check each index for being inside the
+				 * provided data. This ensures all values are properly initialized, and also avoids
+				 * any risks of array overrun. */
+				for (uint i = 0; i < lengthof(housespec->accepts_cargo); i++) {
+					if (i < count) {
+						housespec->accepts_cargo[i] = GetCargoTranslation(buf->ReadByte(), _cur.grffile);
+						housespec->cargo_acceptance[i] = buf->ReadByte();
+					} else {
+						housespec->accepts_cargo[i] = CT_INVALID;
+						housespec->cargo_acceptance[i] = 0;
+					}
+				}
+				break;
+			}
+
 			default:
 				ret = CIR_UNKNOWN;
 				break;

src/table/town_land.h

@@ -1812,8 +1812,11 @@ assert_compile(lengthof(_town_draw_tile_data) == (NEW_HOUSE_OFFSET) * 4 * 4);
  * @see HouseSpec
  */
 #define MS(mnd, mxd, p, rc, bn, rr, mg, ca1, ca2, ca3, bf, ba, cg1, cg2, cg3) \
-	{mnd, mxd, p, rc, bn, rr, mg, {ca1, ca2, ca3}, {cg1, cg2, cg3}, bf, ba, true, \
+	{mnd, mxd, p, rc, bn, rr, mg, \
-	 GRFFileProps(INVALID_HOUSE_ID), 0, {0, 0, 0, 0}, 16, NO_EXTRA_FLAG, HOUSE_NO_CLASS, {0, 2, 0, 0}, 0, 0, 0}
+	{ca1, ca2, ca3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, \
+	{cg1, cg2, cg3, CT_INVALID, CT_INVALID, CT_INVALID, CT_INVALID, CT_INVALID, CT_INVALID, CT_INVALID, CT_INVALID, CT_INVALID, CT_INVALID, CT_INVALID, CT_INVALID, CT_INVALID}, \
+	bf, ba, true, GRFFileProps(INVALID_HOUSE_ID), 0, {0, 0, 0, 0}, \
+	16, NO_EXTRA_FLAG, HOUSE_NO_CLASS, {0, 2, 0, 0}, 0, 0, 0}
 /** House specifications from original data */
 static const HouseSpec _original_house_specs[] = {
 	/**

src/town_cmd.cpp

@@ -611,7 +611,7 @@ static inline void AddAcceptedCargoSetMask(CargoID cargo, uint amount, CargoArra
 static void AddAcceptedCargo_Town(TileIndex tile, CargoArray &acceptance, CargoTypes *always_accepted)
 {
 	const HouseSpec *hs = HouseSpec::Get(GetHouseType(tile));
-	CargoID accepts[3];
+	CargoID accepts[lengthof(hs->accepts_cargo)];
 
 	/* Set the initial accepted cargo types */
 	for (uint8 i = 0; i < lengthof(accepts); i++) {