SettingsHandler: Migrate to new filesystem interface

Change SettingsHandler to take a buffer instead of assuming that the
setting file to read is always on the host filesystem for more
flexibility and make it possible to use the new filesystem interface.

Source/Core/Common/SettingsHandler.cpp

@@ -19,8 +19,6 @@
 #endif
 
 #include "Common/CommonTypes.h"
-#include "Common/File.h"
-#include "Common/FileUtil.h"
 #include "Common/SettingsHandler.h"
 #include "Common/Timer.h"
 
@@ -29,30 +27,21 @@ SettingsHandler::SettingsHandler()
   Reset();
 }
 
-bool SettingsHandler::Open(const std::string& settings_file_path)
+SettingsHandler::SettingsHandler(Buffer&& buffer)
+{
+  SetBytes(std::move(buffer));
+}
+
+const SettingsHandler::Buffer& SettingsHandler::GetBytes() const
+{
+  return m_buffer;
+}
+
+void SettingsHandler::SetBytes(SettingsHandler::Buffer&& buffer)
 {
   Reset();
-
-  File::IOFile file{settings_file_path, "rb"};
-  if (!file.ReadBytes(m_buffer.data(), m_buffer.size()))
-    return false;
-
+  m_buffer = std::move(buffer);
   Decrypt();
-  return true;
-}
-
-bool SettingsHandler::Save(const std::string& destination_file_path) const
-{
-  if (!File::CreateFullPath(destination_file_path))
-    return false;
-
-  File::IOFile file{destination_file_path, "wb"};
-  return file.WriteBytes(m_buffer.data(), m_buffer.size());
-}
-
-const u8* SettingsHandler::GetData() const
-{
-  return m_buffer.data();
 }
 
 const std::string SettingsHandler::GetValue(const std::string& key)

Source/Core/Common/SettingsHandler.h

@@ -21,14 +21,14 @@ public:
     INITIAL_SEED = 0x73B5DBFA
   };
 
+  using Buffer = std::array<u8, SETTINGS_SIZE>;
   SettingsHandler();
-
-  bool Open(const std::string& settings_file_path);
-  bool Save(const std::string& destination_file_path) const;
+  explicit SettingsHandler(Buffer&& buffer);
 
   void AddSetting(const std::string& key, const std::string& value);
 
-  const u8* GetData() const;
+  const Buffer& GetBytes() const;
+  void SetBytes(Buffer&& buffer);
   const std::string GetValue(const std::string& key);
 
   void Decrypt();

Source/Core/Core/Boot/Boot_BS2Emu.cpp

@@ -25,7 +25,9 @@
 #include "Core/HW/Memmap.h"
 #include "Core/IOS/ES/ES.h"
 #include "Core/IOS/ES/Formats.h"
+#include "Core/IOS/FS/FileSystem.h"
 #include "Core/IOS/IOS.h"
+#include "Core/IOS/Uids.h"
 #include "Core/PowerPC/PowerPC.h"
 
 #include "DiscIO/Enums.h"
@@ -225,15 +227,22 @@ bool CBoot::SetupWiiMemory()
 
   SettingsHandler gen;
   std::string serno;
-  const std::string settings_file_path(
-      Common::GetTitleDataPath(Titles::SYSTEM_MENU, Common::FROM_SESSION_ROOT) + "/" WII_SETTING);
-  if (File::Exists(settings_file_path) && gen.Open(settings_file_path))
-  {
-    serno = gen.GetValue("SERNO");
-    gen.Reset();
+  const std::string settings_file_path(Common::GetTitleDataPath(Titles::SYSTEM_MENU) +
+                                       "/" WII_SETTING);
 
-    File::Delete(settings_file_path);
+  const auto fs = IOS::HLE::GetIOS()->GetFS();
+  {
+    SettingsHandler::Buffer data;
+    const auto file = fs->OpenFile(IOS::SYSMENU_UID, IOS::SYSMENU_GID, settings_file_path,
+                                   IOS::HLE::FS::Mode::Read);
+    if (file && file->Read(data.data(), data.size()))
+    {
+      gen.SetBytes(std::move(data));
+      serno = gen.GetValue("SERNO");
+      gen.Reset();
+    }
   }
+  fs->Delete(IOS::SYSMENU_UID, IOS::SYSMENU_GID, settings_file_path);
 
   if (serno.empty() || serno == "000000000")
   {
@@ -258,14 +267,17 @@ bool CBoot::SetupWiiMemory()
   gen.AddSetting("VIDEO", region_setting.video);
   gen.AddSetting("GAME", region_setting.game);
 
-  if (!gen.Save(settings_file_path))
+  constexpr IOS::HLE::FS::Mode rw_mode = IOS::HLE::FS::Mode::ReadWrite;
+  const auto settings_file = fs->CreateAndOpenFile(IOS::SYSMENU_UID, IOS::SYSMENU_GID,
+                                                   settings_file_path, rw_mode, rw_mode, rw_mode);
+  if (!settings_file || !settings_file->Write(gen.GetBytes().data(), gen.GetBytes().size()))
   {
     PanicAlertT("SetupWiiMemory: Can't create setting.txt file");
     return false;
   }
 
   // Write the 256 byte setting.txt to memory.
-  Memory::CopyToEmu(0x3800, gen.GetData(), SettingsHandler::SETTINGS_SIZE);
+  Memory::CopyToEmu(0x3800, gen.GetBytes().data(), gen.GetBytes().size());
 
   INFO_LOG(BOOT, "Setup Wii Memory...");
 

Source/Core/Core/IOS/Network/KD/NetKDRequest.cpp

@@ -16,7 +16,9 @@
 
 #include "Core/CommonTitles.h"
 #include "Core/HW/Memmap.h"
+#include "Core/IOS/FS/FileSystem.h"
 #include "Core/IOS/Network/Socket.h"
+#include "Core/IOS/Uids.h"
 
 namespace IOS
 {
@@ -82,20 +84,23 @@ IPCCommandResult NetKDRequest::IOCtl(const IOCtlRequest& request)
     INFO_LOG(IOS_WC24, "NET_KD_REQ: IOCTL_NWC24_REQUEST_GENERATED_USER_ID");
     if (config.CreationStage() == NWC24::NWC24Config::NWC24_IDCS_INITIAL)
     {
-      const std::string settings_file_path(
-          Common::GetTitleDataPath(Titles::SYSTEM_MENU, Common::FROM_SESSION_ROOT) +
-          "/" WII_SETTING);
-      SettingsHandler gen;
+      const std::string settings_file_path =
+          Common::GetTitleDataPath(Titles::SYSTEM_MENU) + "/" WII_SETTING;
       std::string area, model;
-      bool got_settings = false;
 
-      if (File::Exists(settings_file_path) && gen.Open(settings_file_path))
+      const auto fs = m_ios.GetFS();
+      if (const auto file = fs->OpenFile(PID_KD, PID_KD, settings_file_path, FS::Mode::Read))
       {
-        area = gen.GetValue("AREA");
-        model = gen.GetValue("MODEL");
-        got_settings = true;
+        SettingsHandler::Buffer data;
+        if (file->Read(data.data(), data.size()))
+        {
+          const SettingsHandler gen{std::move(data)};
+          area = gen.GetValue("AREA");
+          model = gen.GetValue("MODEL");
+        }
       }
-      if (got_settings)
+
+      if (!area.empty() && !model.empty())
       {
         u8 area_code = GetAreaCode(area);
         u8 id_ctr = config.IdGen();