Add cs_set_ent_class native

gamedata/modules.games/game.cstrike.txt

@@ -79,6 +79,22 @@
 				"mac"       "@_Z23UTIL_FindEntityByStringP11CBaseEntityPKcS2_"
 			}
 
+			"AddEntityHashValue" // void AddEntityHashValue(struct entvars_s *pev, const char *value, hash_types_e fieldType)
+			{
+				"library"   "server"
+				"windows"   "\x8B\x2A\x2A\x2A\x83\x2A\x2A\x85\x2A\x53\x55\x56\x57\x0F"
+				"linux"     "@_Z18AddEntityHashValueP9entvars_sPKc12hash_types_e"
+				"mac"       "@_Z18AddEntityHashValueP9entvars_sPKc12hash_types_e"
+			}
+
+			"RemoveEntityHashValue" // void RemoveEntityHashValue(struct entvars_s *pev, const char *value, hash_types_e fieldType)
+			{
+				"library"   "server"
+				"windows"   "\x8B\x2A\x2A\x2A\x53\x8B\x2A\x55\x8A\x2A\x33"
+				"linux"     "@_Z21RemoveEntityHashValueP9entvars_sPKc12hash_types_e"
+				"mac"       "@_Z21RemoveEntityHashValueP9entvars_sPKc12hash_types_e"
+			}
+
 			"GetWeaponInfo" // WeaponInfoStruct *GetWeaponInfo(int id);
 			{
 				"library"   "server"

modules/cstrike/cstrike/CstrikeHacks.cpp

@@ -39,6 +39,8 @@ CDetour *BuyGunAmmoDetour;
 CreateNamedEntityFunc       CS_CreateNamedEntity;
 UTIL_FindEntityByStringFunc CS_UTIL_FindEntityByString;
 GetWeaponInfoFunc           GetWeaponInfo;
+AddEntityHashValueFunc      AddEntityHashValue;
+RemoveEntityHashValueFunc   RemoveEntityHashValue;
 
 int CurrentItemId;
 bool TriggeredFromCommand;
@@ -537,6 +539,16 @@ void InitFuncsAddresses()
 		GetWeaponInfo = reinterpret_cast<GetWeaponInfoFunc>(address);
 	}
 
+	if (MainConfig->GetMemSig("AddEntityHashValue", &address)) // cs_set_ent_class()
+	{
+		AddEntityHashValue = reinterpret_cast<AddEntityHashValueFunc>(address);
+	}
+
+	if (MainConfig->GetMemSig("RemoveEntityHashValue", &address)) // cs_set_ent_class()
+	{
+		RemoveEntityHashValue = reinterpret_cast<RemoveEntityHashValueFunc>(address);
+	}
+
 
 	if (!CS_CreateNamedEntity)
 	{

modules/cstrike/cstrike/CstrikeHacks.h

@@ -54,13 +54,22 @@ extern CDetour *CanBuyThisDetour;
 extern CDetour *GiveDefaultItemsDetour;
 extern CDetour *BuyGunAmmoDetour;
 
+enum class HashType
+{
+	Classname
+};
+
 typedef edict_t* (*CreateNamedEntityFunc)(string_t iszClassname);
 typedef void*    (*UTIL_FindEntityByStringFunc)(void* pStartEntity, const char *szKeyword, const char *szValue);
 typedef WeaponInfoStruct* (*GetWeaponInfoFunc)(int id);
+typedef void (*AddEntityHashValueFunc)(struct entvars_s *pev, const char *value, HashType fieldType);
+typedef void (*RemoveEntityHashValueFunc)(struct entvars_s *pev, const char *value, HashType fieldType);
 
 extern CreateNamedEntityFunc       CS_CreateNamedEntity;
 extern UTIL_FindEntityByStringFunc CS_UTIL_FindEntityByString;
 extern GetWeaponInfoFunc           GetWeaponInfo;
+extern AddEntityHashValueFunc      AddEntityHashValue;
+extern RemoveEntityHashValueFunc   RemoveEntityHashValue;
 
 extern CDetour *GiveDefaultItemsDetour;
 extern enginefuncs_t *g_pengfuncsTable;

modules/cstrike/cstrike/CstrikeNatives.cpp

@@ -1782,6 +1782,34 @@ static cell AMX_NATIVE_CALL cs_find_ent_by_owner(AMX* amx, cell* params)
 	return 0;
 }
 
+// cs_set_ent_class(index, const classname[])
+static cell AMX_NATIVE_CALL cs_set_ent_class(AMX* amx, cell* params)
+{
+	if (AddEntityHashValue <= 0 || RemoveEntityHashValue <= 0)
+	{
+		MF_LogError(amx, AMX_ERR_NATIVE, "Native cs_set_ent_class() is disabled. Check your amxx logs.");
+		return 0;
+	}
+
+	auto entity = params[1];
+	CHECK_ENTITY_SIMPLE(entity);
+
+	auto pev = TypeConversion.id_to_entvars(entity);
+
+	if (pev->classname)
+	{
+		RemoveEntityHashValue(pev, STRING(pev->classname), HashType::Classname);
+	}
+
+	int length;
+	auto new_classname = MF_GetAmxString(amx, params[2], 0, &length);
+
+	pev->classname = ALLOC_STRING(new_classname);
+	AddEntityHashValue(pev, STRING(pev->classname), HashType::Classname);
+
+	return 1;
+}
+
 // native any:cs_get_item_id(const name[], &CsWeaponClassType:classid = CS_WEAPONCLASS_NONE);
 static cell AMX_NATIVE_CALL cs_get_item_id(AMX* amx, cell* params)
 {
@@ -2004,6 +2032,7 @@ AMX_NATIVE_INFO CstrikeNatives[] =
 	{"cs_create_entity",			cs_create_entity },
 	{"cs_find_ent_by_class",		cs_find_ent_by_class},
 	{"cs_find_ent_by_owner",        cs_find_ent_by_owner},
+	{"cs_set_ent_class",			cs_set_ent_class },
 	{"cs_get_item_id",		        cs_get_item_id},
 	{"cs_get_translated_item_alias",cs_get_translated_item_alias},
 	{"cs_get_weapon_info",          cs_get_weapon_info},

plugins/include/cstrike.inc

@@ -1015,7 +1015,7 @@ native cs_create_entity(const classname[]);
  *       classname lookup compared to the default FindEntityByString (used by
  *       find_ent_by_class() for example).
  * @note This exclusively considers entities in the hashtable, created by the
- *       game itself or using cs_create_entity().
+ *       game itself, using cs_create_entity(), or added via cs_set_ent_class().
  *
  * @param start_index   Entity index to start searching from. -1 to start from
  *                      the first entity
@@ -1034,7 +1034,7 @@ native cs_find_ent_by_class(start_index, const classname[]);
  *       classname lookup compared to the default FindEntityByString (used by
  *       find_ent_by_owner() for example).
  * @note This exclusively considers entities in the hashtable, created by the
- *       game itself or using cs_create_entity().
+ *       game itself, using cs_create_entity(), or added via cs_set_ent_class().
  *
  * @param start_index   Entity index to start searching from. -1 to start from
  *                      the first entity
@@ -1045,6 +1045,20 @@ native cs_find_ent_by_class(start_index, const classname[]);
  */
 native cs_find_ent_by_owner(start_index, const classname[], owner);
 
+/**
+ * Sets a custom classname of an entity.
+ *
+ * @note Unlike other mods CS keeps track of entities using a custom hashtable.
+ *       This function adds or updates the classname in the hasthable as well.
+ *       This is useful for use with cs_find_ent_by_class() and cs_find_ent_by_owner().
+ *
+ * @param index         Entity index
+ * @param classname     Classname to update for
+ *
+ * @noreturn
+ */
+native cs_set_ent_class(index, const classname[]);
+
 /**
  * Returns the item id associated with an item name and its aliases.
  *