feat(LuaEngine/Packed GUIDs) Add support for writing packed GUIDs and reading packed GUID size (#295)

src/LuaEngine/LuaFunctions.cpp

@@ -113,6 +113,7 @@ luaL_Reg GlobalMethods[] =
     { "GetGUIDLow", &LuaGlobalFunctions::GetGUIDLow },
     { "GetGUIDType", &LuaGlobalFunctions::GetGUIDType },
     { "GetGUIDEntry", &LuaGlobalFunctions::GetGUIDEntry },
+    { "GetPackedGUIDSize", &LuaGlobalFunctions::GetPackedGUIDSize },
     { "GetAreaName", &LuaGlobalFunctions::GetAreaName },
     { "GetOwnerHalaa", &LuaGlobalFunctions::GetOwnerHalaa },
     { "bit_not", &LuaGlobalFunctions::bit_not },
@@ -1204,6 +1205,7 @@ ElunaRegister<WorldPacket> PacketMethods[] =
     { "WriteLong", &LuaPacket::WriteLong },
     { "WriteULong", &LuaPacket::WriteULong },
     { "WriteGUID", &LuaPacket::WriteGUID },
+    { "WritePackedGUID", &LuaPacket::WritePackedGUID },
     { "WriteString", &LuaPacket::WriteString },
     { "WriteFloat", &LuaPacket::WriteFloat },
     { "WriteDouble", &LuaPacket::WriteDouble },

src/LuaEngine/methods/GlobalMethods.h

@@ -468,6 +468,20 @@ namespace LuaGlobalFunctions
         return 1;
     }
 
+    /**
+     * Returns the byte size in bytes (2-9) of the ObjectGuid when packed.
+     *
+     * @param ObjectGuid guid : the ObjectGuid to get packed size for
+     * @return number size
+     */
+    int GetPackedGUIDSize(lua_State* L)
+    {
+        ObjectGuid guid = Eluna::CHECKVAL<ObjectGuid>(L, 1);
+        PackedGuid packedGuid(guid);
+        Eluna::Push(L, static_cast<int>(packedGuid.size()));
+        return 1;
+    }
+
     /**
      * Returns the area or zone's name.
      *

src/LuaEngine/methods/WorldPacketMethods.h

@@ -212,6 +212,19 @@ namespace LuaPacket
         return 0;
     }
 
+    /**
+     * Writes an ObjectGuid as packed GUID format to the [WorldPacket].
+     *
+     * @param ObjectGuid value : the ObjectGuid to be packed to the [WorldPacket]
+     */
+    int WritePackedGUID(lua_State* L, WorldPacket* packet)
+    {
+        ObjectGuid guid = Eluna::CHECKVAL<ObjectGuid>(L, 2);
+        PackedGuid packedGuid(guid);
+        (*packet) << packedGuid;
+        return 0;
+    }
+
     /**
      * Writes a string to the [WorldPacket].
      *