use platform file functions for savestates and NAND importing file check

should fix character encoding issues on Windows

src/frontend/qt_sdl/EmuInstance.cpp

@@ -552,7 +552,7 @@ bool EmuInstance::savestateExists(int slot)
 
 bool EmuInstance::loadState(const std::string& filename)
 {
-    FILE* file = fopen(filename.c_str(), "rb");
+    Platform::FileHandle* file = Platform::OpenFile(filename, Platform::FileMode::Read);
     if (file == nullptr)
     { // If we couldn't open the state file...
         Platform::Log(Platform::LogLevel::Error, "Failed to open state file \"%s\"\n", filename.c_str());
@@ -563,38 +563,31 @@ bool EmuInstance::loadState(const std::string& filename)
     if (backup->Error)
     { // If we couldn't allocate memory for the backup...
         Platform::Log(Platform::LogLevel::Error, "Failed to allocate memory for state backup\n");
-        fclose(file);
+        Platform::CloseFile(file);
         return false;
     }
 
     if (!nds->DoSavestate(backup.get()) || backup->Error)
     { // Back up the emulator's state. If that failed...
         Platform::Log(Platform::LogLevel::Error, "Failed to back up state, aborting load (from \"%s\")\n", filename.c_str());
-        fclose(file);
+        Platform::CloseFile(file);
         return false;
     }
     // We'll store the backup once we're sure that the state was loaded.
     // Now that we know the file and backup are both good, let's load the new state.
 
     // Get the size of the file that we opened
-    if (fseek(file, 0, SEEK_END) != 0)
+    size_t size = Platform::FileLength(file);
-    {
-        Platform::Log(Platform::LogLevel::Error, "Failed to seek to end of state file \"%s\"\n", filename.c_str());
-        fclose(file);
-        return false;
-    }
-    size_t size = ftell(file);
-    rewind(file); // reset the filebuf's position
 
     // Allocate exactly as much memory as we need for the savestate
     std::vector<u8> buffer(size);
-    if (fread(buffer.data(), size, 1, file) == 0)
+    if (Platform::FileRead(buffer.data(), size, 1, file) == 0)
     { // Read the state file into the buffer. If that failed...
         Platform::Log(Platform::LogLevel::Error, "Failed to read %u-byte state file \"%s\"\n", size, filename.c_str());
-        fclose(file);
+        Platform::CloseFile(file);
         return false;
     }
-    fclose(file); // done with the file now
+    Platform::CloseFile(file); // done with the file now
 
     // Get ready to load the state from the buffer into the emulator
     std::unique_ptr<Savestate> state = std::make_unique<Savestate>(buffer.data(), size, false);
@@ -626,7 +619,7 @@ bool EmuInstance::loadState(const std::string& filename)
 
 bool EmuInstance::saveState(const std::string& filename)
 {
-    FILE* file = fopen(filename.c_str(), "wb");
+    Platform::FileHandle* file = Platform::OpenFile(filename, Platform::FileMode::Write);
 
     if (file == nullptr)
     { // If the file couldn't be opened...
@@ -636,7 +629,7 @@ bool EmuInstance::saveState(const std::string& filename)
     Savestate state;
     if (state.Error)
     { // If there was an error creating the state (and allocating its memory)...
-        fclose(file);
+        Platform::CloseFile(file);
         return false;
     }
 
@@ -645,22 +638,22 @@ bool EmuInstance::saveState(const std::string& filename)
 
     if (state.Error)
     {
-        fclose(file);
+        Platform::CloseFile(file);
         return false;
     }
 
-    if (fwrite(state.Buffer(), state.Length(), 1, file) == 0)
+    if (Platform::FileWrite(state.Buffer(), state.Length(), 1, file) == 0)
     { // Write the Savestate buffer to the file. If that fails...
         Platform::Log(Platform::Error,
                       "Failed to write %d-byte savestate to %s\n",
                       state.Length(),
                       filename.c_str()
         );
-        fclose(file);
+        Platform::CloseFile(file);
         return false;
     }
 
-    fclose(file);
+    Platform::CloseFile(file);
 
     if (globalCfg.GetBool("Savestate.RelocSRAM") && ndsSave)
     {

src/frontend/qt_sdl/TitleManagerDialog.cpp

@@ -303,7 +303,7 @@ void TitleManagerDialog::onImportTitleData()
 
     if (file.isEmpty()) return;
 
-    FILE* f = fopen(file.toStdString().c_str(), "rb");
+    Platform::FileHandle* f = Platform::OpenFile(file.toStdString(), Platform::Read);
     if (!f)
     {
         QMessageBox::critical(this,
@@ -312,9 +312,8 @@ void TitleManagerDialog::onImportTitleData()
         return;
     }
 
-    fseek(f, 0, SEEK_END);
+    u64 len = Platform::FileLength(f);
-    u64 len = ftell(f);
+    Platform::CloseFile(f);
-    fclose(f);
 
     if (len != wantedsize)
     {