update WorldConverter (WIP)

src/items/Inventory.cpp

@@ -81,6 +81,15 @@ std::unique_ptr<dynamic::Map> Inventory::serialize() const {
     return map;
 }
 
+void Inventory::convert(const ContentReport* report) {
+    for (auto& slot : slots) {
+        itemid_t id = slot.getItemId();
+        itemid_t replacement = report->items.getId(id);
+        slot.set(ItemStack(replacement, slot.getCount()));
+    }
+}
+
+// TODO: remove
 void Inventory::convert(dynamic::Map* data, const ContentReport* report) {
     auto slotsarr = data->list("slots");
     for (size_t i = 0; i < slotsarr->size(); i++) {

src/items/Inventory.hpp

@@ -42,6 +42,7 @@ public:
     /* serializing inventory */
     std::unique_ptr<dynamic::Map> serialize() const override;
 
+    void convert(const ContentReport* report);
     static void convert(dynamic::Map* data, const ContentReport* report);
 
     inline void setId(int64_t id) {

src/items/ItemStack.cpp

@@ -16,6 +16,9 @@ void ItemStack::set(const ItemStack& item) {
     if (count == 0) {
         this->item = 0;
     }
+    if (this->item == 0) {
+        count = 0;
+    }
 }
 
 bool ItemStack::accepts(const ItemStack& other) const {