Clean warnings and harden image decoding

CMakeLists.txt

@@ -45,6 +45,7 @@ add_compile_options(
     /Zc:preprocessor
     /wd4100
     /wd4201
+    /wd4324
 )
 
 if(MSVC)

include/core/ImageDecoder.hpp

@@ -6,6 +6,9 @@
 #include <filesystem>
 #include <optional>
 #include <functional>
+#include <atomic>
+#include <condition_variable>
+#include <mutex>
 #include <wrl/client.h>
 #include <wincodec.h>
 
@@ -57,6 +60,9 @@ class ImageDecoder {
     ImageDecoder();
     ~ImageDecoder();
 
+    ImageDecoder(const ImageDecoder&) = delete;
+    ImageDecoder& operator=(const ImageDecoder&) = delete;
+
     // Main decoding interface
     std::unique_ptr<DecodedImage> Decode(
         const std::filesystem::path& filePath,
@@ -84,6 +90,13 @@ class ImageDecoder {
     static std::vector<std::wstring> GetSupportedExtensions();
 
 private:
+    struct AsyncDecodeState {
+        std::atomic<bool> shuttingDown{false};
+        std::mutex mutex;
+        std::condition_variable idle;
+        size_t activeTasks = 0;
+    };
+
     // WIC decoder implementation
     std::unique_ptr<DecodedImage> DecodeWithWIC(
         const std::filesystem::path& filePath,
@@ -103,6 +116,7 @@ class ImageDecoder {
     );
 
     Microsoft::WRL::ComPtr<IWICImagingFactory2> wicFactory_;
+    std::shared_ptr<AsyncDecodeState> asyncState_;
 };
 
 } // namespace Core

src/core/Application.cpp

@@ -26,7 +26,7 @@ namespace {
 void DebugLog(const char* msg) {
     static FILE* f = nullptr;
     if (!f) {
-        f = fopen("debug_log.txt", "w");
+        fopen_s(&f, "debug_log.txt", "w");
     }
     if (f) {
         fprintf(f, "%s\n", msg);
@@ -1343,7 +1343,8 @@ void Application::SaveScanCache(const std::vector<ScannedImage>& results)
         // [24..31] reserved, already zero
 
         // Write entire buffer in one call
-        FILE* f = _wfopen(filePath.c_str(), L"wb");
+        FILE* f = nullptr;
+        _wfopen_s(&f, filePath.c_str(), L"wb");
         if (!f) return;
 
         fwrite(header, 1, kHeaderSize, f);
@@ -1365,7 +1366,8 @@ std::vector<ScannedImage> Application::LoadScanCache()
     if (filePath.empty()) return results;
 
     try {
-        FILE* f = _wfopen(filePath.c_str(), L"rb");
+        FILE* f = nullptr;
+        _wfopen_s(&f, filePath.c_str(), L"rb");
         if (!f) return results;
 
         // Get file size
@@ -1456,7 +1458,8 @@ void Application::LoadFolderProfiles()
     auto path = GetFolderProfilePath();
     if (path.empty()) return;
 
-    FILE* f = _wfopen(path.c_str(), L"rb");
+    FILE* f = nullptr;
+    _wfopen_s(&f, path.c_str(), L"rb");
     if (!f) return;
 
     // Header: "FPROF" + version(4) + count(4)
@@ -1497,7 +1500,8 @@ void Application::SaveFolderProfiles()
     std::lock_guard lock(scanMutex_);
 
     std::filesystem::create_directories(path.parent_path());
-    FILE* f = _wfopen(path.c_str(), L"wb");
+    FILE* f = nullptr;
+    _wfopen_s(&f, path.c_str(), L"wb");
     if (!f) return;
 
     fwrite("FPROF", 1, 5, f);