diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index 9d22cc9458..46e2dc8399 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -598,6 +598,8 @@ add_library(core STATIC
hle/service/mii/mii.h
hle/service/mii/mii_database.cpp
hle/service/mii/mii_database.h
+ hle/service/mii/mii_database_manager.cpp
+ hle/service/mii/mii_database_manager.h
hle/service/mii/mii_manager.cpp
hle/service/mii/mii_manager.h
hle/service/mii/mii_result.h
diff --git a/src/core/hle/service/mii/mii_database_manager.cpp b/src/core/hle/service/mii/mii_database_manager.cpp
new file mode 100644
index 0000000000..63c411690c
--- /dev/null
+++ b/src/core/hle/service/mii/mii_database_manager.cpp
@@ -0,0 +1,420 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "common/assert.h"
+#include "common/fs/file.h"
+#include "common/fs/fs.h"
+#include "common/fs/path_util.h"
+#include "common/logging/log.h"
+#include "common/string_util.h"
+
+#include "core/hle/service/mii/mii_database_manager.h"
+#include "core/hle/service/mii/mii_result.h"
+#include "core/hle/service/mii/mii_util.h"
+#include "core/hle/service/mii/types/char_info.h"
+#include "core/hle/service/mii/types/store_data.h"
+
+namespace Service::Mii {
+constexpr std::string DbFileName = "MiiDatabase.dat";
+
+DatabaseManager::DatabaseManager() {}
+
+Result DatabaseManager::MountSaveData() {
+ if (!is_save_data_mounted) {
+ system_save_dir =
+ Common::FS::GetYuzuPath(Common::FS::YuzuPath::NANDDir) / "system/save/8000000000000030";
+ if (is_test_db) {
+ system_save_dir = Common::FS::GetYuzuPath(Common::FS::YuzuPath::NANDDir) /
+ "system/save/8000000000000031";
+ }
+
+ // mount point should be "mii:"
+
+ if (!Common::FS::CreateDirs(system_save_dir)) {
+ return ResultUnknown;
+ }
+ }
+
+ is_save_data_mounted = true;
+ return ResultSuccess;
+}
+
+Result DatabaseManager::Initialize(DatabaseSessionMetadata& metadata, bool& is_database_broken) {
+ is_database_broken = false;
+ if (!is_save_data_mounted) {
+ return ResultInvalidArgument;
+ }
+
+ database.CleanDatabase();
+ update_counter++;
+ metadata.update_counter = update_counter;
+
+ const Common::FS::IOFile db_file{system_save_dir / DbFileName, Common::FS::FileAccessMode::Read,
+ Common::FS::FileType::BinaryFile};
+
+ if (!db_file.IsOpen()) {
+ return SaveDatabase();
+ }
+
+ if (Common::FS::GetSize(system_save_dir / DbFileName) != sizeof(NintendoFigurineDatabase)) {
+ is_database_broken = true;
+ }
+
+ if (db_file.Read(database) != 1) {
+ is_database_broken = true;
+ }
+
+ if (is_database_broken) {
+ // Dragons happen here for simplicity just clean the database
+ LOG_ERROR(Service_Mii, "Mii database is corrupted");
+ database.CleanDatabase();
+ return ResultUnknown;
+ }
+
+ const auto result = database.CheckIntegrity();
+
+ if (result.IsError()) {
+ LOG_ERROR(Service_Mii, "Mii database is corrupted 0x{:0x}", result.raw);
+ database.CleanDatabase();
+ return ResultSuccess;
+ }
+
+ LOG_INFO(Service_Mii, "Successfully loaded mii database. size={}",
+ database.GetDatabaseLength());
+ return ResultSuccess;
+}
+
+bool DatabaseManager::IsFullDatabase() const {
+ return database.GetDatabaseLength() == MaxDatabaseLength;
+}
+
+bool DatabaseManager::IsModified() const {
+ return is_moddified;
+}
+
+u64 DatabaseManager::GetUpdateCounter() const {
+ return update_counter;
+}
+
+u32 DatabaseManager::GetCount(const DatabaseSessionMetadata& metadata) const {
+ const u32 database_size = database.GetDatabaseLength();
+ if (metadata.magic == MiiMagic) {
+ return database_size;
+ }
+
+ // Special mii can't be used. Skip those.
+
+ u32 mii_count{};
+ for (std::size_t index = 0; index < database_size; ++index) {
+ const auto& store_data = database.Get(index);
+ if (store_data.IsSpecial()) {
+ continue;
+ }
+ mii_count++;
+ }
+
+ return mii_count;
+}
+
+void DatabaseManager::Get(StoreData& out_store_data, std::size_t index,
+ const DatabaseSessionMetadata& metadata) const {
+ if (metadata.magic == MiiMagic) {
+ out_store_data = database.Get(index);
+ return;
+ }
+
+ // The index refeers to the mii index without special mii.
+ // Search on the database until we find it
+
+ u32 virtual_index = 0;
+ const u32 database_size = database.GetDatabaseLength();
+ for (std::size_t i = 0; i < database_size; ++i) {
+ const auto& store_data = database.Get(i);
+ if (store_data.IsSpecial()) {
+ continue;
+ }
+ if (virtual_index == index) {
+ out_store_data = store_data;
+ return;
+ }
+ virtual_index++;
+ }
+
+ // This function doesn't fail. It returns the first mii instead
+ out_store_data = database.Get(0);
+}
+
+Result DatabaseManager::FindIndex(s32& out_index, const Common::UUID& create_id,
+ bool is_special) const {
+ u32 index{};
+ const bool is_found = database.GetIndexByCreatorId(index, create_id);
+
+ if (!is_found) {
+ return ResultNotFound;
+ }
+
+ if (is_special) {
+ out_index = index;
+ return ResultSuccess;
+ }
+
+ if (database.Get(index).IsSpecial()) {
+ return ResultNotFound;
+ }
+
+ out_index = 0;
+
+ if (index < 1) {
+ return ResultSuccess;
+ }
+
+ for (std::size_t i = 0; i <= index; ++i) {
+ if (database.Get(i).IsSpecial()) {
+ continue;
+ }
+ out_index++;
+ }
+ return ResultSuccess;
+}
+
+Result DatabaseManager::FindIndex(const DatabaseSessionMetadata& metadata, u32& out_index,
+ const Common::UUID& create_id) const {
+ u32 index{};
+ const bool is_found = database.GetIndexByCreatorId(index, create_id);
+
+ if (!is_found) {
+ return ResultNotFound;
+ }
+
+ if (metadata.magic == MiiMagic) {
+ out_index = index;
+ return ResultSuccess;
+ }
+
+ if (database.Get(index).IsSpecial()) {
+ return ResultNotFound;
+ }
+
+ out_index = 0;
+
+ if (index < 1) {
+ return ResultSuccess;
+ }
+
+ // The index refeers to the mii index without special mii.
+ // Search on the database until we find it
+
+ for (std::size_t i = 0; i <= index; ++i) {
+ const auto& store_data = database.Get(i);
+ if (store_data.IsSpecial()) {
+ continue;
+ }
+ out_index++;
+ }
+ return ResultSuccess;
+}
+
+Result DatabaseManager::FindMoveIndex(u32& out_index, u32 new_index,
+ const Common::UUID& create_id) const {
+ const auto database_size = database.GetDatabaseLength();
+
+ if (database_size >= 1) {
+ u32 virtual_index{};
+ for (std::size_t i = 0; i < database_size; ++i) {
+ const StoreData& store_data = database.Get(i);
+ if (store_data.IsSpecial()) {
+ continue;
+ }
+ if (virtual_index == new_index) {
+ const bool is_found = database.GetIndexByCreatorId(out_index, create_id);
+ if (!is_found) {
+ return ResultNotFound;
+ }
+ if (store_data.IsSpecial()) {
+ return ResultInvalidOperation;
+ }
+ return ResultSuccess;
+ }
+ virtual_index++;
+ }
+ }
+
+ const bool is_found = database.GetIndexByCreatorId(out_index, create_id);
+ if (!is_found) {
+ return ResultNotFound;
+ }
+ const StoreData& store_data = database.Get(out_index);
+ if (store_data.IsSpecial()) {
+ return ResultInvalidOperation;
+ }
+ return ResultSuccess;
+}
+
+Result DatabaseManager::Move(DatabaseSessionMetadata& metadata, u32 new_index,
+ const Common::UUID& create_id) {
+ u32 current_index{};
+ if (metadata.magic == MiiMagic) {
+ const bool is_found = database.GetIndexByCreatorId(current_index, create_id);
+ if (!is_found) {
+ return ResultNotFound;
+ }
+ } else {
+ const auto result = FindMoveIndex(current_index, new_index, create_id);
+ if (result.IsError()) {
+ return result;
+ }
+ }
+
+ const auto result = database.Move(current_index, new_index);
+ if (result.IsFailure()) {
+ return result;
+ }
+
+ is_moddified = true;
+ update_counter++;
+ metadata.update_counter = update_counter;
+ return ResultSuccess;
+}
+
+Result DatabaseManager::AddOrReplace(DatabaseSessionMetadata& metadata,
+ const StoreData& store_data) {
+ if (store_data.IsValid() != ValidationResult::NoErrors) {
+ return ResultInvalidStoreData;
+ }
+ if (metadata.magic != MiiMagic && store_data.IsSpecial()) {
+ return ResultInvalidOperation;
+ }
+
+ u32 index{};
+ const bool is_found = database.GetIndexByCreatorId(index, store_data.GetCreateId());
+ if (is_found) {
+ const StoreData& old_store_data = database.Get(index);
+
+ if (store_data.IsSpecial() != old_store_data.IsSpecial()) {
+ return ResultInvalidOperation;
+ }
+
+ database.Replace(index, store_data);
+ } else {
+ if (database.IsFull()) {
+ return ResultDatabaseFull;
+ }
+
+ database.Add(store_data);
+ }
+
+ is_moddified = true;
+ update_counter++;
+ metadata.update_counter = update_counter;
+ return ResultSuccess;
+}
+
+Result DatabaseManager::Delete(DatabaseSessionMetadata& metadata, const Common::UUID& create_id) {
+ u32 index{};
+ const bool is_found = database.GetIndexByCreatorId(index, create_id);
+ if (!is_found) {
+ return ResultNotFound;
+ }
+
+ if (metadata.magic != MiiMagic) {
+ const auto& store_data = database.Get(index);
+ if (store_data.IsSpecial()) {
+ return ResultInvalidOperation;
+ }
+ }
+
+ database.Delete(index);
+
+ is_moddified = true;
+ update_counter++;
+ metadata.update_counter = update_counter;
+ return ResultSuccess;
+}
+
+Result DatabaseManager::Append(DatabaseSessionMetadata& metadata, const CharInfo& char_info) {
+ if (char_info.Verify() != ValidationResult::NoErrors) {
+ return ResultInvalidCharInfo2;
+ }
+ if (char_info.GetType() == 1) {
+ return ResultInvalidCharInfoType;
+ }
+
+ u32 index{};
+ StoreData store_data{};
+
+ // Loop until the mii we created is not on the database
+ do {
+ store_data.BuildWithCharInfo(char_info);
+ } while (database.GetIndexByCreatorId(index, store_data.GetCreateId()));
+
+ const Result result = store_data.Restore();
+
+ if (result.IsSuccess() || result == ResultNotUpdated) {
+ return AddOrReplace(metadata, store_data);
+ }
+
+ return result;
+}
+
+Result DatabaseManager::DestroyFile(DatabaseSessionMetadata& metadata) {
+ database.CorruptCrc();
+
+ is_moddified = true;
+ update_counter++;
+ metadata.update_counter = update_counter;
+
+ const auto result = SaveDatabase();
+ database.CleanDatabase();
+
+ return result;
+}
+
+Result DatabaseManager::DeleteFile() {
+ const bool result = Common::FS::RemoveFile(system_save_dir / DbFileName);
+ // Return proper FS error here
+ return result ? ResultSuccess : ResultUnknown;
+}
+
+void DatabaseManager::Format(DatabaseSessionMetadata& metadata) {
+ database.CleanDatabase();
+ is_moddified = true;
+ update_counter++;
+ metadata.update_counter = update_counter;
+}
+
+Result DatabaseManager::SaveDatabase() {
+ // TODO: Replace unknown error codes with proper FS error codes when available
+
+ if (!Common::FS::Exists(system_save_dir / DbFileName)) {
+ if (!Common::FS::NewFile(system_save_dir / DbFileName)) {
+ LOG_ERROR(Service_Mii, "Failed to create mii database");
+ return ResultUnknown;
+ }
+ }
+
+ const auto file_size = Common::FS::GetSize(system_save_dir / DbFileName);
+ if (file_size != 0 && file_size != sizeof(NintendoFigurineDatabase)) {
+ if (!Common::FS::RemoveFile(system_save_dir / DbFileName)) {
+ LOG_ERROR(Service_Mii, "Failed to delete mii database");
+ return ResultUnknown;
+ }
+ if (!Common::FS::NewFile(system_save_dir / DbFileName)) {
+ LOG_ERROR(Service_Mii, "Failed to create mii database");
+ return ResultUnknown;
+ }
+ }
+
+ const Common::FS::IOFile db_file{system_save_dir / DbFileName,
+ Common::FS::FileAccessMode::ReadWrite,
+ Common::FS::FileType::BinaryFile};
+
+ if (db_file.Write(database) != 1) {
+ LOG_ERROR(Service_Mii, "Failed to save mii database");
+ return ResultUnknown;
+ }
+
+ is_moddified = false;
+ return ResultSuccess;
+}
+
+} // namespace Service::Mii
diff --git a/src/core/hle/service/mii/mii_database_manager.h b/src/core/hle/service/mii/mii_database_manager.h
new file mode 100644
index 0000000000..52c32be82c
--- /dev/null
+++ b/src/core/hle/service/mii/mii_database_manager.h
@@ -0,0 +1,58 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "common/fs/fs.h"
+#include "core/hle/result.h"
+#include "core/hle/service/mii/mii_database.h"
+
+namespace Service::Mii {
+class CharInfo;
+class StoreData;
+
+class DatabaseManager {
+public:
+ DatabaseManager();
+ Result MountSaveData();
+ Result Initialize(DatabaseSessionMetadata& metadata, bool& is_database_broken);
+
+ bool IsFullDatabase() const;
+ bool IsModified() const;
+ u64 GetUpdateCounter() const;
+
+ void Get(StoreData& out_store_data, std::size_t index,
+ const DatabaseSessionMetadata& metadata) const;
+ u32 GetCount(const DatabaseSessionMetadata& metadata) const;
+
+ Result FindIndex(s32& out_index, const Common::UUID& create_id, bool is_special) const;
+ Result FindIndex(const DatabaseSessionMetadata& metadata, u32& out_index,
+ const Common::UUID& create_id) const;
+ Result FindMoveIndex(u32& out_index, u32 new_index, const Common::UUID& create_id) const;
+
+ Result Move(DatabaseSessionMetadata& metadata, u32 current_index,
+ const Common::UUID& create_id);
+ Result AddOrReplace(DatabaseSessionMetadata& metadata, const StoreData& out_store_data);
+ Result Delete(DatabaseSessionMetadata& metadata, const Common::UUID& create_id);
+ Result Append(DatabaseSessionMetadata& metadata, const CharInfo& char_info);
+
+ Result DestroyFile(DatabaseSessionMetadata& metadata);
+ Result DeleteFile();
+ void Format(DatabaseSessionMetadata& metadata);
+
+ Result SaveDatabase();
+
+private:
+ // This is the global value of
+ // nn::settings::fwdbg::GetSettingsItemValue("is_db_test_mode_enabled");
+ bool is_test_db{};
+
+ bool is_moddified{};
+ bool is_save_data_mounted{};
+ u64 update_counter{};
+ NintendoFigurineDatabase database{};
+
+ std::filesystem::path system_save_dir{};
+};
+
+}; // namespace Service::Mii