Qt: Give better error messages when Wii save importing fails.

Source/Core/Core/HW/WiiSave.cpp

@@ -477,28 +477,28 @@ StoragePointer MakeDataBinStorage(IOS::HLE::IOSC* iosc, const std::string& path,
   return StoragePointer{new DataBinStorage{iosc, path, mode}};
 }
 
-bool Copy(Storage* source, Storage* dest)
+CopyResult Copy(Storage* source, Storage* dest)
 {
   // first make sure we can read all the data from the source
   const auto header = source->ReadHeader();
   if (!header)
   {
     ERROR_LOG_FMT(CORE, "WiiSave::Copy: Failed to read header");
-    return false;
+    return CopyResult::CorruptedSource;
   }
 
   const auto bk_header = source->ReadBkHeader();
   if (!bk_header)
   {
     ERROR_LOG_FMT(CORE, "WiiSave::Copy: Failed to read bk header");
-    return false;
+    return CopyResult::CorruptedSource;
   }
 
   const auto files = source->ReadFiles();
   if (!files)
   {
     ERROR_LOG_FMT(CORE, "WiiSave::Copy: Failed to read files");
-    return false;
+    return CopyResult::CorruptedSource;
   }
 
   // once we have confirmed we can read the source, erase corresponding save in the destination
@@ -507,7 +507,7 @@ bool Copy(Storage* source, Storage* dest)
     if (!dest->EraseSave())
     {
       ERROR_LOG_FMT(CORE, "WiiSave::Copy: Failed to erase existing save");
-      return false;
+      return CopyResult::Error;
     }
   }
 
@@ -515,25 +515,25 @@ bool Copy(Storage* source, Storage* dest)
   if (!dest->WriteHeader(*header))
   {
     ERROR_LOG_FMT(CORE, "WiiSave::Copy: Failed to write header");
-    return false;
+    return CopyResult::Error;
   }
 
   if (!dest->WriteBkHeader(*bk_header))
   {
     ERROR_LOG_FMT(CORE, "WiiSave::Copy: Failed to write bk header");
-    return false;
+    return CopyResult::Error;
   }
 
   if (!dest->WriteFiles(*files))
   {
     ERROR_LOG_FMT(CORE, "WiiSave::Copy: Failed to write files");
-    return false;
+    return CopyResult::Error;
   }
 
-  return true;
+  return CopyResult::Success;
 }
 
-bool Import(const std::string& data_bin_path, std::function<bool()> can_overwrite)
+CopyResult Import(const std::string& data_bin_path, std::function<bool()> can_overwrite)
 {
   IOS::HLE::Kernel ios;
   const auto data_bin = MakeDataBinStorage(&ios.GetIOSC(), data_bin_path, "rb");
@@ -541,23 +541,23 @@ bool Import(const std::string& data_bin_path, std::function<bool()> can_overwrit
   if (!header)
   {
     ERROR_LOG_FMT(CORE, "WiiSave::Import: Failed to read header");
-    return false;
+    return CopyResult::CorruptedSource;
   }
 
   if (!WiiUtils::EnsureTMDIsImported(*ios.GetFS(), *ios.GetES(), header->tid))
   {
     ERROR_LOG_FMT(CORE, "WiiSave::Import: Failed to find or import TMD for title {:16x}",
                   header->tid);
-    return false;
+    return CopyResult::TitleMissing;
   }
 
   const auto nand = MakeNandStorage(ios.GetFS().get(), header->tid);
   if (nand->SaveExists() && !can_overwrite())
-    return false;
+    return CopyResult::Cancelled;
   return Copy(data_bin.get(), nand.get());
 }
 
-static bool Export(u64 tid, std::string_view export_path, IOS::HLE::Kernel* ios)
+static CopyResult Export(u64 tid, std::string_view export_path, IOS::HLE::Kernel* ios)
 {
   const std::string path = fmt::format("{}/private/wii/title/{}{}{}{}/data.bin", export_path,
                                        static_cast<char>(tid >> 24), static_cast<char>(tid >> 16),
@@ -566,7 +566,7 @@ static bool Export(u64 tid, std::string_view export_path, IOS::HLE::Kernel* ios)
               MakeDataBinStorage(&ios->GetIOSC(), path, "w+b").get());
 }
 
-bool Export(u64 tid, std::string_view export_path)
+CopyResult Export(u64 tid, std::string_view export_path)
 {
   IOS::HLE::Kernel ios;
   return Export(tid, export_path, &ios);
@@ -578,7 +578,7 @@ size_t ExportAll(std::string_view export_path)
   size_t exported_save_count = 0;
   for (const u64 title : ios.GetES()->GetInstalledTitles())
   {
-    if (Export(title, export_path, &ios))
+    if (Export(title, export_path, &ios) == CopyResult::Success)
       ++exported_save_count;
   }
   return exported_save_count;

Source/Core/Core/HW/WiiSave.h

@@ -32,12 +32,21 @@ using StoragePointer = std::unique_ptr<Storage, StorageDeleter>;
 StoragePointer MakeNandStorage(IOS::HLE::FS::FileSystem* fs, u64 tid);
 StoragePointer MakeDataBinStorage(IOS::HLE::IOSC* iosc, const std::string& path, const char* mode);
 
-bool Copy(Storage* source, Storage* destination);
+enum class CopyResult
+{
+  Success,
+  Error,
+  Cancelled,
+  CorruptedSource,
+  TitleMissing,
+};
+
+CopyResult Copy(Storage* source, Storage* destination);
 
 /// Import a save into the NAND from a .bin file.
-bool Import(const std::string& data_bin_path, std::function<bool()> can_overwrite);
+CopyResult Import(const std::string& data_bin_path, std::function<bool()> can_overwrite);
 /// Export a save to a .bin file.
-bool Export(u64 tid, std::string_view export_path);
+CopyResult Export(u64 tid, std::string_view export_path);
 /// Export all saves that are in the NAND. Returns the number of exported saves.
 size_t ExportAll(std::string_view export_path);
 }  // namespace WiiSave

Source/Core/DolphinQt/GameList/GameList.cpp

@@ -452,8 +452,11 @@ void GameList::ExportWiiSave()
   QList<std::string> failed;
   for (const auto& game : GetSelectedGames())
   {
-    if (!WiiSave::Export(game->GetTitleID(), export_dir.toStdString()))
+    if (WiiSave::Export(game->GetTitleID(), export_dir.toStdString()) !=
+        WiiSave::CopyResult::Success)
+    {
       failed.push_back(game->GetName(UICommon::GameFile::Variant::LongAndPossiblyCustom));
+    }
   }
 
   if (!failed.isEmpty())

Source/Core/DolphinQt/MenuBar.cpp

@@ -1066,19 +1066,39 @@ void MenuBar::ImportWiiSave()
   if (file.isEmpty())
     return;
 
-  bool cancelled = false;
   auto can_overwrite = [&] {
-    bool yes = ModalMessageBox::question(
-                   this, tr("Save Import"),
-                   tr("Save data for this title already exists in the NAND. Consider backing up "
-                      "the current data before overwriting.\nOverwrite now?")) == QMessageBox::Yes;
-    cancelled = !yes;
-    return yes;
+    return ModalMessageBox::question(
+               this, tr("Save Import"),
+               tr("Save data for this title already exists in the NAND. Consider backing up "
+                  "the current data before overwriting.\nOverwrite now?")) == QMessageBox::Yes;
   };
-  if (WiiSave::Import(file.toStdString(), can_overwrite))
-    ModalMessageBox::information(this, tr("Save Import"), tr("Successfully imported save files."));
-  else if (!cancelled)
-    ModalMessageBox::critical(this, tr("Save Import"), tr("Failed to import save files."));
+
+  const auto result = WiiSave::Import(file.toStdString(), can_overwrite);
+  switch (result)
+  {
+  case WiiSave::CopyResult::Success:
+    ModalMessageBox::information(this, tr("Save Import"), tr("Successfully imported save file."));
+    break;
+  case WiiSave::CopyResult::CorruptedSource:
+    ModalMessageBox::critical(this, tr("Save Import"),
+                              tr("Failed to import save file. The given file appears to be "
+                                 "corrupted or is not a valid Wii save."));
+    break;
+  case WiiSave::CopyResult::TitleMissing:
+    ModalMessageBox::critical(
+        this, tr("Save Import"),
+        tr("Failed to import save file. Please launch the game once, then try again."));
+    break;
+  case WiiSave::CopyResult::Cancelled:
+    break;
+  default:
+    ModalMessageBox::critical(
+        this, tr("Save Import"),
+        tr("Failed to import save file. Your NAND may be corrupt, or something is preventing "
+           "access to files within it. Try repairing your NAND (Tools -> Manage NAND -> Check "
+           "NAND...), then import the save again."));
+    break;
+  }
 }
 
 void MenuBar::ExportWiiSaves()