refactor: Lazy load winscard

> still requires proper testing with hardware

external/scard/scard.cpp

@@ -30,8 +30,65 @@
 #include <thread>
 #include "util/utils.h"
 #include "util/logging.h"
+#include "util/libutils.h"
 #include "hooks/sleephook.h"
 
+//_INFO: Lazy load winscard, not tested on actual hardware
+struct Winscard
+{
+
+    decltype(&::SCardEstablishContext) SCardEstablishContext;
+    decltype(&::SCardListReadersA) SCardListReadersA;
+    decltype(&::SCardFreeMemory) SCardFreeMemory;
+    decltype(&::SCardGetStatusChangeA) SCardGetStatusChangeA;
+    decltype(&::SCardConnectA) SCardConnectA;
+    decltype(&::SCardTransmit) SCardTransmit;
+    decltype(&::SCardStatusA) SCardStatusA;
+    decltype(&::SCardDisconnect) SCardDisconnect;
+    decltype(::g_rgSCardT0Pci)* g_rgSCardT0Pci;
+    decltype(::g_rgSCardT1Pci)* g_rgSCardT1Pci;
+    inline static Winscard *instance = nullptr;
+
+    static HMODULE attach()
+    {
+        if (instance) return instance->lib_;
+        instance = new Winscard();
+        return instance->lib_;
+    }
+
+private:
+    HMODULE lib_;
+
+    Winscard()
+    {
+        #define GETPROC(name) (name) = reinterpret_cast<decltype(name)>(GetProcAddress(lib_, #name))
+        if ((lib_ = libutils::try_library("winscard.dll")))
+        {
+            GETPROC(SCardEstablishContext);
+            GETPROC(SCardListReadersA);
+            GETPROC(SCardFreeMemory);
+            GETPROC(SCardGetStatusChangeA);
+            GETPROC(SCardConnectA);
+            GETPROC(SCardTransmit);
+            GETPROC(SCardStatusA);
+            GETPROC(SCardDisconnect);
+            GETPROC(g_rgSCardT0Pci);
+            GETPROC(g_rgSCardT1Pci);
+        }
+        #undef GETPROC
+    }
+};
+#define SCardEstablishContext Winscard::instance->SCardEstablishContext
+#define SCardListReadersA Winscard::instance->SCardListReadersA
+#define SCardFreeMemory Winscard::instance->SCardFreeMemory
+#define SCardGetStatusChangeA Winscard::instance->SCardGetStatusChangeA
+#define SCardConnectA Winscard::instance->SCardConnectA
+#define SCardTransmit Winscard::instance->SCardTransmit
+#define SCardStatusA Winscard::instance->SCardStatusA
+#define SCardDisconnect Winscard::instance->SCardDisconnect
+#define g_rgSCardT0Pci (*Winscard::instance->g_rgSCardT0Pci)
+#define g_rgSCardT1Pci (*Winscard::instance->g_rgSCardT1Pci)
+
 #define MAX_APDU_SIZE 255
 #define SCARD_POLL_INTERVAL_MS 100
 
@@ -402,6 +459,11 @@ int scard_threadmain() {
 }
 
 void scard_threadstart() {
+    if(!Winscard::attach())
+    {
+        log_warning("scard", "Support disabled due to missing winscard.dll");
+        return;
+    }
     std::thread t(scard_threadmain);
     t.detach();
 }