chore: fix loading and writing code for IW5

src/ObjLoading/Game/IW5/Weapon/LoaderAttachmentIW5.cpp

@@ -0,0 +1,54 @@
+#include "LoaderAttachmentIW5.h"
+
+#include "Game/IW5/IW5.h"
+#include "JsonWeaponAttachmentLoader.h"
+
+#include <cstring>
+#include <format>
+#include <iostream>
+
+using namespace IW5;
+
+namespace
+{
+    class AttachmentLoader final : public AssetCreator<AssetAttachment>
+    {
+    public:
+        AttachmentLoader(MemoryManager& memory, ISearchPath& searchPath)
+            : m_memory(memory),
+              m_search_path(searchPath)
+        {
+        }
+
+        AssetCreationResult CreateAsset(const std::string& assetName, AssetCreationContext& context) override
+        {
+            const auto file = m_search_path.Open(std::format("attachment/{}.json", assetName));
+            if (!file.IsOpen())
+                return AssetCreationResult::NoAction();
+
+            auto* attachment = m_memory.Alloc<WeaponAttachment>();
+            attachment->szInternalName = m_memory.Dup(assetName.c_str());
+
+            AssetRegistration<AssetAttachment> registration(assetName, attachment);
+            if (!LoadWeaponAttachmentAsJson(*file.m_stream, *attachment, m_memory, context, registration))
+            {
+                std::cerr << std::format("Failed to load attachment \"{}\"\n", assetName);
+                return AssetCreationResult::Failure();
+            }
+
+            return AssetCreationResult::Success(context.AddAsset(std::move(registration)));
+        }
+
+    private:
+        MemoryManager& m_memory;
+        ISearchPath& m_search_path;
+    };
+} // namespace
+
+namespace IW5
+{
+    std::unique_ptr<AssetCreator<AssetAttachment>> CreateAttachmentLoader(MemoryManager& memory, ISearchPath& searchPath)
+    {
+        return std::make_unique<AttachmentLoader>(memory, searchPath);
+    }
+} // namespace IW5