implement three functions used in save scenario

src/scenario.c

@@ -799,6 +799,27 @@ int scenario_write_available_objects(FILE *file)
 	return 1;
 }
 
+static void sub_677552()
+{
+	RCT2_GLOBAL(0x0013587BC, uint32) = 0x31144;
+	RCT2_GLOBAL(0x001358778, uint32) = RCT2_GLOBAL(0x009E2D28, uint32);
+}
+
+static void sub_674BCF()
+{
+	char *savedExpansionPackNames = (char*)0x0135946C;
+
+	for (int i = 0; i < 16; i++) {
+		char *dst = &savedExpansionPackNames[i * 128];
+		if (RCT2_GLOBAL(RCT2_ADDRESS_EXPANSION_FLAGS, uint16) & (1 << i)) {
+			char *src = &(RCT2_ADDRESS(RCT2_ADDRESS_EXPANSION_NAMES, char)[i * 128]);
+			strncpy(dst, src, 128);
+		} else {
+			*dst = 0;
+		}
+	}
+}
+
 /**
  *
  *  rct2: 0x006754F5
@@ -833,10 +854,10 @@ int scenario_save(char *path, int flags)
 		window_close_construction_windows();
 
 	map_reorganise_elements();
-	RCT2_CALLPROC_EBPSAFE(0x0069EBE4);
-	RCT2_CALLPROC_EBPSAFE(0x0069EBA4);
-	RCT2_CALLPROC_EBPSAFE(0x00677552);
-	RCT2_CALLPROC_EBPSAFE(0x00674BCF);
+	reset_0x69EBE4();
+	sprite_clear_all_unused();
+	sub_677552();
+	sub_674BCF();
 
 	// Set saved view
 	w = window_get_main();

src/scenario.h

@@ -255,7 +255,7 @@ typedef struct {
 	uint16 word_01358836;
 	uint32 word_01358838;
 	uint16 suggested_max_guests;
-	uint16 word_0135883E;
+	uint16 park_rating_warning_days;
 	uint8 word_01358840;
 	uint8 rct1_water_colour;
 	uint8 pad_01358842[2];
@@ -270,10 +270,9 @@ typedef struct {
 	uint16 park_entrance_x[4];
 	uint16 park_entrance_y[4];
 	uint16 park_entrance_z[4];
-	uint8 byte_01359368;
-	uint8 pad_01359369[3];
-	uint8 byte_0135936C[256];
-	uint8 byte_0135946C[3256];
+	uint8 park_entrance_direction[4];
+	uint8 scenario_filename[256];
+	uint8 saved_expansion_pack_names[3256];
 	rct_banner banners[250]
 	char custom_strings[0x8000];
 	uint32 game_ticks_1;

src/world/sprite.c

@@ -611,19 +611,15 @@ void reset_sprite_list(){
 
 	RCT2_GLOBAL(0x13573C8, uint16) = 0x2710;
 
-	//RCT2_CALLPROC_EBPSAFE(0x0069EBE4);
 	reset_0x69EBE4();
 }
 
-/*
- *
- * rct: 0x0069EBE4
+/**
+ * rct2: 0x0069EBE4
  * This function looks as though it sets some sort of order for sprites.
  * Sprites can share thier position if this is the case.
  */
 void reset_0x69EBE4(){
-	//RCT2_CALLPROC_EBPSAFE(0x0069EBE4);
-	//return;
 	memset((uint16*)0xF1EF60, -1, 0x10001*2);
 
 	rct_sprite* spr = g_sprite_list;
@@ -648,6 +644,28 @@ void reset_0x69EBE4(){
 	}
 }
 
+/**
+ * Clears all the unused sprite memory to zero. Probably so that it can be compressed better when saving.
+ * rct2: 0x0069EBA4
+ */
+void sprite_clear_all_unused()
+{
+	rct_unk_sprite *sprite;
+	uint16 spriteIndex, nextSpriteIndex;
+	
+	spriteIndex = RCT2_GLOBAL(RCT2_ADDRESS_SPRITES_NEXT_INDEX, uint16);
+	while (spriteIndex != SPRITE_INDEX_NULL) {
+		sprite = &g_sprite_list[spriteIndex].unknown;
+		nextSpriteIndex = sprite->next;
+		memset(sprite, 0, sizeof(rct_sprite));
+		sprite->sprite_identifier = SPRITE_IDENTIFIER_NULL;
+		sprite->next = nextSpriteIndex;
+		sprite->linked_list_type_offset = SPRITE_LINKEDLIST_OFFSET_NULL;
+		sprite->sprite_index = spriteIndex;
+		spriteIndex = nextSpriteIndex;
+	}
+}
+
 /*
 * rct2: 0x0069EC6B
 * bl: if bl & 2 > 0, the sprite ends up in the MISC linked list.

src/world/sprite.h

@@ -34,9 +34,11 @@ enum SPRITE_IDENTIFIER{
 	SPRITE_IDENTIFIER_PEEP = 1,
 	SPRITE_IDENTIFIER_MISC = 2,
 	SPRITE_IDENTIFIER_LITTER = 3,
+	SPRITE_IDENTIFIER_NULL = 255
 };
 
 typedef enum {
+	SPRITE_LINKEDLIST_OFFSET_NULL = 0,
 	SPRITE_LINKEDLIST_OFFSET_VEHICLE = 2,
 	SPRITE_LINKEDLIST_OFFSET_PEEP = 4,
 	SPRITE_LINKEDLIST_OFFSET_MISC = 6,
@@ -243,6 +245,7 @@ void money_effect_create(money32 value);
 rct_sprite *create_sprite(uint8 bl);
 void reset_sprite_list();
 void reset_0x69EBE4();
+void sprite_clear_all_unused();
 void move_sprite_to_list(rct_sprite *sprite, uint8 cl);
 void sprite_misc_update_all();
 void sprite_move(sint16 x, sint16 y, sint16 z, rct_sprite* sprite);