HostInterface: Add helper methods for getting paths to save states/memcards

src/core/host_interface.cpp

@@ -474,7 +474,10 @@ void HostInterface::CreateUserDirectorySubdirectories()
 {
   bool result = true;
 
+  result &= FileSystem::CreateDirectory(GetUserDirectoryRelativePath("bios").c_str(), false);
   result &= FileSystem::CreateDirectory(GetUserDirectoryRelativePath("cache").c_str(), false);
+  result &= FileSystem::CreateDirectory(GetUserDirectoryRelativePath("savestates").c_str(), false);
+  result &= FileSystem::CreateDirectory(GetUserDirectoryRelativePath("memcards").c_str(), false);
 
   if (!result)
     ReportError("Failed to create one or more user directories. This may cause issues at runtime.");
@@ -513,6 +516,32 @@ std::string HostInterface::GetGameListDatabaseFileName() const
   return GetUserDirectoryRelativePath("cache/redump.dat");
 }
 
+std::string HostInterface::GetGameSaveStateFileName(const char* game_code, s32 slot)
+{
+  if (slot < 0)
+    return GetUserDirectoryRelativePath("savestates/%s_resume.sav", game_code);
+  else
+    return GetUserDirectoryRelativePath("savestates/%s_%d.sav", game_code, slot);
+}
+
+std::string HostInterface::GetGlobalSaveStateFileName(s32 slot)
+{
+  if (slot < 0)
+    return GetUserDirectoryRelativePath("savestates/resume.sav");
+  else
+    return GetUserDirectoryRelativePath("savestates/savestate_%d.sav", slot);
+}
+
+std::string HostInterface::GetSharedMemoryCardPath(u32 slot)
+{
+  return GetUserDirectoryRelativePath("memcards/shared_card_%d.mcd", slot + 1);
+}
+
+std::string HostInterface::GetGameMemoryCardPath(const char* game_code, u32 slot)
+{
+  return GetUserDirectoryRelativePath("memcards/game_card_%s_%d.mcd", game_code, slot + 1);
+}
+
 void HostInterface::UpdateSettings(const std::function<void()>& apply_callback)
 {
   const GPURenderer old_gpu_renderer = m_settings.gpu_renderer;

src/core/host_interface.h

@@ -104,6 +104,18 @@ protected:
   /// Returns the path of the game database cache file.
   std::string GetGameListDatabaseFileName() const;
 
+  /// Returns the path to a save state file. Specifying an index of -1 is the "resume" save state.
+  std::string GetGameSaveStateFileName(const char* game_code, s32 slot);
+
+  /// Returns the path to a save state file. Specifying an index of -1 is the "resume" save state.
+  std::string GetGlobalSaveStateFileName(s32 slot);
+
+  /// Returns the default path to a memory card.
+  std::string GetSharedMemoryCardPath(u32 slot);
+
+  /// Returns the default path to a memory card for a specific game.
+  std::string GetGameMemoryCardPath(const char* game_code, u32 slot);
+
   /// Applies new settings, updating internal state as needed. apply_callback should call m_settings.Load() after
   /// locking any required mutexes.
   void UpdateSettings(const std::function<void()>& apply_callback);