yuzu/main: Notify user of loading errors with Amiibo data

We shouldn't silently continue if loading failed, since the general
assumption is that no messages showing up implicitly indicates success.

src/core/hle/service/nfp/nfp.cpp

@@ -328,13 +328,15 @@ void Module::Interface::CreateUserInterface(Kernel::HLERequestContext& ctx) {
     rb.PushIpcInterface<IUser>(*this);
 }
 
-void Module::Interface::LoadAmiibo(const std::vector<u8>& buffer) {
+bool Module::Interface::LoadAmiibo(const std::vector<u8>& buffer) {
     std::lock_guard<std::recursive_mutex> lock(HLE::g_hle_lock);
     if (buffer.size() < sizeof(AmiiboFile)) {
-        return; // Failed to load file
+        return false;
     }
+
     std::memcpy(&amiibo, buffer.data(), sizeof(amiibo));
     nfc_tag_load->Signal();
+    return true;
 }
 const Kernel::SharedPtr<Kernel::Event>& Module::Interface::GetNFCEvent() const {
     return nfc_tag_load;

src/core/hle/service/nfp/nfp.h

@@ -32,7 +32,7 @@ public:
         static_assert(sizeof(AmiiboFile) == 0x94, "AmiiboFile is an invalid size");
 
         void CreateUserInterface(Kernel::HLERequestContext& ctx);
-        void LoadAmiibo(const std::vector<u8>& buffer);
+        bool LoadAmiibo(const std::vector<u8>& buffer);
         const Kernel::SharedPtr<Kernel::Event>& GetNFCEvent() const;
         const AmiiboFile& GetAmiiboBuffer() const;
 

src/yuzu/main.cpp

@@ -29,6 +29,7 @@ static FileSys::VirtualFile VfsDirectoryCreateFileWrapper(const FileSys::Virtual
 #define QT_NO_OPENGL
 #include <QDesktopWidget>
 #include <QDialogButtonBox>
+#include <QFile>
 #include <QFileDialog>
 #include <QMessageBox>
 #include <QtConcurrent/QtConcurrent>
@@ -1304,20 +1305,40 @@ void GMainWindow::OnLoadAmiibo() {
     const QString extensions{"*.bin"};
     const QString file_filter = tr("Amiibo File (%1);; All Files (*.*)").arg(extensions);
     const QString filename = QFileDialog::getOpenFileName(this, tr("Load Amiibo"), "", file_filter);
-    if (!filename.isEmpty()) {
-        Core::System& system{Core::System::GetInstance()};
-        Service::SM::ServiceManager& sm = system.ServiceManager();
-        auto nfc = sm.GetService<Service::NFP::Module::Interface>("nfp:user");
-        if (nfc != nullptr) {
-            auto nfc_file = FileUtil::IOFile(filename.toStdString(), "rb");
-            if (!nfc_file.IsOpen()) {
-                return;
-            }
-            std::vector<u8> amiibo_buffer(nfc_file.GetSize());
-            nfc_file.ReadBytes(amiibo_buffer.data(), amiibo_buffer.size());
-            nfc_file.Close();
-            nfc->LoadAmiibo(amiibo_buffer);
-        }
+
+    if (filename.isEmpty()) {
+        return;
+    }
+
+    Core::System& system{Core::System::GetInstance()};
+    Service::SM::ServiceManager& sm = system.ServiceManager();
+    auto nfc = sm.GetService<Service::NFP::Module::Interface>("nfp:user");
+    if (nfc == nullptr) {
+        return;
+    }
+
+    QFile nfc_file{filename};
+    if (!nfc_file.open(QIODevice::ReadOnly)) {
+        QMessageBox::warning(this, tr("Error opening Amiibo data file"),
+                             tr("Unable to open Amiibo file \"%1\" for reading.").arg(filename));
+        return;
+    }
+
+    const u64 nfc_file_size = nfc_file.size();
+    std::vector<u8> buffer(nfc_file_size);
+    const u64 read_size = nfc_file.read(reinterpret_cast<char*>(buffer.data()), nfc_file_size);
+    if (nfc_file_size != read_size) {
+        QMessageBox::warning(this, tr("Error reading Amiibo data file"),
+                             tr("Unable to fully read Amiibo data. Expected to read %1 bytes, but "
+                                "was only able to read %2 bytes.")
+                                 .arg(nfc_file_size)
+                                 .arg(read_size));
+        return;
+    }
+
+    if (!nfc->LoadAmiibo(buffer)) {
+        QMessageBox::warning(this, tr("Error loading Amiibo data"),
+                             tr("Unable to load Amiibo data."));
     }
 }