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Refactor Rust::Result into std::expected

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The standard library already has support for this type as of C++23:
https://en.cppreference.com/w/cpp/header/expected

[This is also supported by all major compilers](https://en.cppreference.com/w/cpp/compiler_support#:~:text=Yes-,%3Cexpected%3E,-P0323R12%0AP2549R1)
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Wunkolo 2024-03-11 09:55:00 -07:00
parent 57193e7944
commit 3d0a0ccc0b
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21 changed files with 349 additions and 1621 deletions
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285
include/fs/archive_base.hpp
View file

@ -2,26 +2,27 @@
#include <cassert>
#include <cstdio>
#include <cstring>
#include <expected>
#include <filesystem>
#include <optional>
#include <string>
#include <type_traits>
#include <vector>
#include "helpers.hpp"
#include "memory.hpp"
#include "result.hpp"
#include "result/result.hpp"
using Result::HorizonResult;
namespace PathType {
enum : u32 {
Invalid = 0,
Empty = 1,
Binary = 2,
ASCII = 3,
UTF16 = 4,
};
enum : u32 {
Invalid = 0,
Empty = 1,
Binary = 2,
ASCII = 3,
UTF16 = 4,
};
}
namespace ArchiveID {
@ -42,83 +43,81 @@ namespace ArchiveID {
UserSaveData2 = 0x567890B4,
};
static std::string toString(u32 id) {
switch (id) {
case SelfNCCH: return "SelfNCCH";
case SaveData: return "SaveData";
case ExtSaveData: return "ExtSaveData";
case SharedExtSaveData: return "SharedExtSaveData";
case SystemSaveData: return "SystemSaveData";
case SDMC: return "SDMC";
case SDMCWriteOnly: return "SDMC (Write-only)";
case SavedataAndNcch: return "Savedata & NCCH (archive 0x2345678A)";
default: return "Unknown archive";
}
}
}
static std::string toString(u32 id) {
switch (id) {
case SelfNCCH: return "SelfNCCH";
case SaveData: return "SaveData";
case ExtSaveData: return "ExtSaveData";
case SharedExtSaveData: return "SharedExtSaveData";
case SystemSaveData: return "SystemSaveData";
case SDMC: return "SDMC";
case SDMCWriteOnly: return "SDMC (Write-only)";
case SavedataAndNcch: return "Savedata & NCCH (archive 0x2345678A)";
default: return "Unknown archive";
}
}
} // namespace ArchiveID
struct FSPath {
u32 type = PathType::Invalid;
u32 type = PathType::Invalid;
std::vector<u8> binary; // Path data for binary paths
std::string string; // Path data for ASCII paths
std::u16string utf16_string;
std::vector<u8> binary; // Path data for binary paths
std::string string; // Path data for ASCII paths
std::u16string utf16_string;
FSPath() {}
FSPath() {}
FSPath(u32 type, const std::vector<u8>& vec) : type(type) {
switch (type) {
case PathType::Binary:
binary = std::move(vec);
break;
FSPath(u32 type, const std::vector<u8>& vec) : type(type) {
switch (type) {
case PathType::Binary: binary = std::move(vec); break;
case PathType::ASCII:
string.resize(vec.size() - 1); // -1 because of the null terminator
std::memcpy(string.data(), vec.data(), vec.size() - 1); // Copy string data
break;
case PathType::ASCII:
string.resize(vec.size() - 1); // -1 because of the null terminator
std::memcpy(string.data(), vec.data(), vec.size() - 1); // Copy string data
break;
case PathType::UTF16: {
const size_t size = vec.size() / sizeof(u16) - 1; // Character count. -1 because null terminator here too
utf16_string.resize(size);
std::memcpy(utf16_string.data(), vec.data(), size * sizeof(u16));
break;
}
; }
}
case PathType::UTF16: {
const size_t size = vec.size() / sizeof(u16) - 1; // Character count. -1 because null terminator here too
utf16_string.resize(size);
std::memcpy(utf16_string.data(), vec.data(), size * sizeof(u16));
break;
};
}
}
};
struct FilePerms {
u32 raw;
u32 raw;
FilePerms(u32 val) : raw(val) {}
bool read() const { return (raw & 1) != 0; }
bool write() const { return (raw & 2) != 0; }
bool create() const { return (raw & 4) != 0; }
FilePerms(u32 val) : raw(val) {}
bool read() const { return (raw & 1) != 0; }
bool write() const { return (raw & 2) != 0; }
bool create() const { return (raw & 4) != 0; }
};
class ArchiveBase;
struct FileSession {
ArchiveBase* archive = nullptr;
FILE* fd = nullptr; // File descriptor for file sessions that require them.
FSPath path;
FSPath archivePath;
u32 priority = 0; // TODO: What does this even do
bool isOpen;
ArchiveBase* archive = nullptr;
FILE* fd = nullptr; // File descriptor for file sessions that require them.
FSPath path;
FSPath archivePath;
u32 priority = 0; // TODO: What does this even do
bool isOpen;
FileSession(ArchiveBase* archive, const FSPath& filePath, const FSPath& archivePath, FILE* fd, bool isOpen = true) :
archive(archive), path(filePath), archivePath(archivePath), fd(fd), isOpen(isOpen), priority(0) {}
FileSession(ArchiveBase* archive, const FSPath& filePath, const FSPath& archivePath, FILE* fd, bool isOpen = true)
: archive(archive), path(filePath), archivePath(archivePath), fd(fd), isOpen(isOpen), priority(0) {}
// For cloning a file session
FileSession(const FileSession& other) : archive(other.archive), path(other.path),
archivePath(other.archivePath), fd(other.fd), isOpen(other.isOpen), priority(other.priority) {}
// For cloning a file session
FileSession(const FileSession& other)
: archive(other.archive), path(other.path), archivePath(other.archivePath), fd(other.fd), isOpen(other.isOpen), priority(other.priority) {}
};
struct ArchiveSession {
ArchiveBase* archive = nullptr;
FSPath path;
bool isOpen;
ArchiveBase* archive = nullptr;
FSPath path;
bool isOpen;
ArchiveSession(ArchiveBase* archive, const FSPath& filePath, bool isOpen = true) : archive(archive), path(filePath), isOpen(isOpen) {}
ArchiveSession(ArchiveBase* archive, const FSPath& filePath, bool isOpen = true) : archive(archive), path(filePath), isOpen(isOpen) {}
};
struct DirectoryEntry {
@ -156,106 +155,104 @@ struct DirectorySession {
using FileDescriptor = std::optional<FILE*>;
class ArchiveBase {
public:
struct FormatInfo {
u32 size; // Archive size
u32 numOfDirectories; // Number of directories
u32 numOfFiles; // Number of files
bool duplicateData; // Whether to duplicate data or not
};
public:
struct FormatInfo {
u32 size; // Archive size
u32 numOfDirectories; // Number of directories
u32 numOfFiles; // Number of files
bool duplicateData; // Whether to duplicate data or not
};
protected:
using Handle = u32;
protected:
using Handle = u32;
static constexpr FileDescriptor NoFile = nullptr;
static constexpr FileDescriptor FileError = std::nullopt;
Memory& mem;
static constexpr FileDescriptor NoFile = nullptr;
static constexpr FileDescriptor FileError = std::nullopt;
Memory& mem;
// Returns if a specified 3DS path in UTF16 or ASCII format is safe or not
// A 3DS path is considered safe if its first character is '/' which means we're not trying to access anything outside the root of the fs
// And if it doesn't contain enough instances of ".." (Indicating "climb up a folder" in filesystems) to let the software climb up the directory tree
// And access files outside of the emulator's app data folder
template <u32 format>
bool isPathSafe(const FSPath& path) {
static_assert(format == PathType::ASCII || format == PathType::UTF16);
using String = typename std::conditional<format == PathType::UTF16, std::u16string, std::string>::type; // String type for the path
using Char = typename String::value_type; // Char type for the path
// Returns if a specified 3DS path in UTF16 or ASCII format is safe or not
// A 3DS path is considered safe if its first character is '/' which means we're not trying to access anything outside the root of the fs
// And if it doesn't contain enough instances of ".." (Indicating "climb up a folder" in filesystems) to let the software climb up the directory
// tree And access files outside of the emulator's app data folder
template <u32 format>
bool isPathSafe(const FSPath& path) {
static_assert(format == PathType::ASCII || format == PathType::UTF16);
using String = typename std::conditional<format == PathType::UTF16, std::u16string, std::string>::type; // String type for the path
using Char = typename String::value_type; // Char type for the path
String pathString, dots;
if constexpr (std::is_same<String, std::u16string>()) {
pathString = path.utf16_string;
dots = u"..";
} else {
pathString = path.string;
dots = "..";
}
String pathString, dots;
if constexpr (std::is_same<String, std::u16string>()) {
pathString = path.utf16_string;
dots = u"..";
} else {
pathString = path.string;
dots = "..";
}
// If the path string doesn't begin with / then that means it's accessing outside the FS root, which is invalid & unsafe
if (pathString[0] != Char('/')) return false;
// If the path string doesn't begin with / then that means it's accessing outside the FS root, which is invalid & unsafe
if (pathString[0] != Char('/')) return false;
// Counts how many folders sans the root our file is nested under.
// If it's < 0 at any point of parsing, then the path is unsafe and tries to crawl outside our file sandbox.
// If it's 0 then this is the FS root.
// If it's > 0 then we're in a subdirectory of the root.
int level = 0;
// Counts how many folders sans the root our file is nested under.
// If it's < 0 at any point of parsing, then the path is unsafe and tries to crawl outside our file sandbox.
// If it's 0 then this is the FS root.
// If it's > 0 then we're in a subdirectory of the root.
int level = 0;
// Split the string on / characters and see how many of the substrings are ".."
size_t pos = 0;
while ((pos = pathString.find(Char('/'))) != String::npos) {
String token = pathString.substr(0, pos);
pathString.erase(0, pos + 1);
// Split the string on / characters and see how many of the substrings are ".."
size_t pos = 0;
while ((pos = pathString.find(Char('/'))) != String::npos) {
String token = pathString.substr(0, pos);
pathString.erase(0, pos + 1);
if (token == dots) {
level--;
if (level < 0) return false;
} else {
level++;
}
}
if (token == dots) {
level--;
if (level < 0) return false;
} else {
level++;
}
}
return true;
}
return true;
}
public:
virtual std::string name() = 0;
virtual u64 getFreeBytes() = 0;
virtual HorizonResult createFile(const FSPath& path, u64 size) = 0;
virtual HorizonResult deleteFile(const FSPath& path) = 0;
public:
virtual std::string name() = 0;
virtual u64 getFreeBytes() = 0;
virtual HorizonResult createFile(const FSPath& path, u64 size) = 0;
virtual HorizonResult deleteFile(const FSPath& path) = 0;
virtual Rust::Result<FormatInfo, HorizonResult> getFormatInfo(const FSPath& path) {
Helpers::panic("Unimplemented GetFormatInfo for %s archive", name().c_str());
// Return a dummy struct just to avoid the UB of not returning anything, even if we panic
return Ok(FormatInfo{ .size = 0, .numOfDirectories = 0, .numOfFiles = 0, .duplicateData = false });
}
virtual std::expected<FormatInfo, HorizonResult> getFormatInfo(const FSPath& path) {
Helpers::panic("Unimplemented GetFormatInfo for %s archive", name().c_str());
// Return a dummy struct just to avoid the UB of not returning anything, even if we panic
return FormatInfo{.size = 0, .numOfDirectories = 0, .numOfFiles = 0, .duplicateData = false};
}
virtual HorizonResult createDirectory(const FSPath& path) {
Helpers::panic("Unimplemented CreateDirectory for %s archive", name().c_str());
return Result::FS::AlreadyExists;
}
virtual HorizonResult createDirectory(const FSPath& path) {
Helpers::panic("Unimplemented CreateDirectory for %s archive", name().c_str());
return Result::FS::AlreadyExists;
}
// Returns nullopt if opening the file failed, otherwise returns a file descriptor to it (nullptr if none is needed)
virtual FileDescriptor openFile(const FSPath& path, const FilePerms& perms) = 0;
virtual Rust::Result<ArchiveBase*, HorizonResult> openArchive(const FSPath& path) = 0;
// Returns nullopt if opening the file failed, otherwise returns a file descriptor to it (nullptr if none is needed)
virtual FileDescriptor openFile(const FSPath& path, const FilePerms& perms) = 0;
virtual std::expected<ArchiveBase*, HorizonResult> openArchive(const FSPath& path) = 0;
virtual Rust::Result<DirectorySession, HorizonResult> openDirectory(const FSPath& path) {
Helpers::panic("Unimplemented OpenDirectory for %s archive", name().c_str());
return Err(Result::FS::FileNotFoundAlt);
}
virtual std::expected<DirectorySession, HorizonResult> openDirectory(const FSPath& path) {
Helpers::panic("Unimplemented OpenDirectory for %s archive", name().c_str());
return std::unexpected(Result::FS::FileNotFoundAlt);
}
virtual void format(const FSPath& path, const FormatInfo& info) {
Helpers::panic("Unimplemented Format for %s archive", name().c_str());
}
virtual void format(const FSPath& path, const FormatInfo& info) { Helpers::panic("Unimplemented Format for %s archive", name().c_str()); }
virtual HorizonResult renameFile(const FSPath& oldPath, const FSPath& newPath) {
virtual HorizonResult renameFile(const FSPath& oldPath, const FSPath& newPath) {
Helpers::panic("Unimplemented RenameFile for %s archive", name().c_str());
return Result::Success;
}
}
// Read size bytes from a file starting at offset "offset" into a certain buffer in memory
// Returns the number of bytes read, or nullopt if the read failed
virtual std::optional<u32> readFile(FileSession* file, u64 offset, u32 size, u32 dataPointer) = 0;
// Read size bytes from a file starting at offset "offset" into a certain buffer in memory
// Returns the number of bytes read, or nullopt if the read failed
virtual std::optional<u32> readFile(FileSession* file, u64 offset, u32 size, u32 dataPointer) = 0;
ArchiveBase(Memory& mem) : mem(mem) {}
ArchiveBase(Memory& mem) : mem(mem) {}
};
struct ArchiveResource {

20
include/fs/archive_ext_save_data.hpp
View file

@ -2,11 +2,13 @@
#include "archive_base.hpp"
class ExtSaveDataArchive : public ArchiveBase {
public:
ExtSaveDataArchive(Memory& mem, const std::string& folder, bool isShared = false) : ArchiveBase(mem),
isShared(isShared), backingFolder(folder) {}
public:
ExtSaveDataArchive(Memory& mem, const std::string& folder, bool isShared = false) : ArchiveBase(mem), isShared(isShared), backingFolder(folder) {}
u64 getFreeBytes() override { Helpers::panic("ExtSaveData::GetFreeBytes unimplemented"); return 0; }
u64 getFreeBytes() override {
Helpers::panic("ExtSaveData::GetFreeBytes unimplemented");
return 0;
}
std::string name() override { return "ExtSaveData::" + backingFolder; }
HorizonResult createDirectory(const FSPath& path) override;
@ -14,14 +16,14 @@ public:
HorizonResult deleteFile(const FSPath& path) override;
HorizonResult renameFile(const FSPath& oldPath, const FSPath& newPath) override;
Rust::Result<ArchiveBase*, HorizonResult> openArchive(const FSPath& path) override;
Rust::Result<DirectorySession, HorizonResult> openDirectory(const FSPath& path) override;
std::expected<ArchiveBase*, HorizonResult> openArchive(const FSPath& path) override;
std::expected<DirectorySession, HorizonResult> openDirectory(const FSPath& path) override;
FileDescriptor openFile(const FSPath& path, const FilePerms& perms) override;
std::optional<u32> readFile(FileSession* file, u64 offset, u32 size, u32 dataPointer) override;
Rust::Result<FormatInfo, HorizonResult> getFormatInfo(const FSPath& path) override {
std::expected<FormatInfo, HorizonResult> getFormatInfo(const FSPath& path) override {
Helpers::warn("Stubbed ExtSaveData::GetFormatInfo");
return Ok(FormatInfo{.size = 1_GB, .numOfDirectories = 255, .numOfFiles = 255, .duplicateData = false});
return FormatInfo{.size = 1_GB, .numOfDirectories = 255, .numOfFiles = 255, .duplicateData = false};
}
// Takes in a binary ExtSaveData path, outputs a combination of the backing folder with the low and high save entries of the path
@ -29,5 +31,5 @@ public:
std::string getExtSaveDataPathFromBinary(const FSPath& path);
bool isShared = false;
std::string backingFolder; // Backing folder for the archive. Can be NAND, Gamecard or SD depending on the archive path.
std::string backingFolder; // Backing folder for the archive. Can be NAND, Gamecard or SD depending on the archive path.
};

9
include/fs/archive_ncch.hpp
View file

@ -2,16 +2,19 @@
#include "archive_base.hpp"
class NCCHArchive : public ArchiveBase {
public:
public:
NCCHArchive(Memory& mem) : ArchiveBase(mem) {}
u64 getFreeBytes() override { Helpers::panic("NCCH::GetFreeBytes unimplemented"); return 0; }
u64 getFreeBytes() override {
Helpers::panic("NCCH::GetFreeBytes unimplemented");
return 0;
}
std::string name() override { return "NCCH"; }
HorizonResult createFile(const FSPath& path, u64 size) override;
HorizonResult deleteFile(const FSPath& path) override;
Rust::Result<ArchiveBase*, HorizonResult> openArchive(const FSPath& path) override;
std::expected<ArchiveBase*, HorizonResult> openArchive(const FSPath& path) override;
FileDescriptor openFile(const FSPath& path, const FilePerms& perms) override;
std::optional<u32> readFile(FileSession* file, u64 offset, u32 size, u32 dataPointer) override;

14
include/fs/archive_save_data.hpp
View file

@ -2,7 +2,7 @@
#include "archive_base.hpp"
class SaveDataArchive : public ArchiveBase {
public:
public:
SaveDataArchive(Memory& mem) : ArchiveBase(mem) {}
u64 getFreeBytes() override { return 32_MB; }
@ -12,21 +12,19 @@ public:
HorizonResult createFile(const FSPath& path, u64 size) override;
HorizonResult deleteFile(const FSPath& path) override;
Rust::Result<ArchiveBase*, HorizonResult> openArchive(const FSPath& path) override;
Rust::Result<DirectorySession, HorizonResult> openDirectory(const FSPath& path) override;
std::expected<ArchiveBase*, HorizonResult> openArchive(const FSPath& path) override;
std::expected<DirectorySession, HorizonResult> openDirectory(const FSPath& path) override;
FileDescriptor openFile(const FSPath& path, const FilePerms& perms) override;
std::optional<u32> readFile(FileSession* file, u64 offset, u32 size, u32 dataPointer) override;
void format(const FSPath& path, const FormatInfo& info) override;
Rust::Result<FormatInfo, HorizonResult> getFormatInfo(const FSPath& path) override;
std::expected<FormatInfo, HorizonResult> getFormatInfo(const FSPath& path) override;
std::filesystem::path getFormatInfoPath() {
return IOFile::getAppData() / "FormatInfo" / "SaveData.format";
}
std::filesystem::path getFormatInfoPath() { return IOFile::getAppData() / "FormatInfo" / "SaveData.format"; }
// Returns whether the cart has save data or not
bool cartHasSaveData() {
auto cxi = mem.getCXI();
return (cxi != nullptr && cxi->hasSaveData()); // We need to have a CXI file with more than 0 bytes of save data
return (cxi != nullptr && cxi->hasSaveData()); // We need to have a CXI file with more than 0 bytes of save data
}
};

4
include/fs/archive_sdmc.hpp
View file

@ -17,8 +17,8 @@ class SDMCArchive : public ArchiveBase {
HorizonResult deleteFile(const FSPath& path) override;
HorizonResult createDirectory(const FSPath& path) override;
Rust::Result<ArchiveBase*, HorizonResult> openArchive(const FSPath& path) override;
Rust::Result<DirectorySession, HorizonResult> openDirectory(const FSPath& path) override;
std::expected<ArchiveBase*, HorizonResult> openArchive(const FSPath& path) override;
std::expected<DirectorySession, HorizonResult> openDirectory(const FSPath& path) override;
FileDescriptor openFile(const FSPath& path, const FilePerms& perms) override;
std::optional<u32> readFile(FileSession* file, u64 offset, u32 size, u32 dataPointer) override;

4
include/fs/archive_self_ncch.hpp
View file

@ -2,7 +2,7 @@
#include "archive_base.hpp"
class SelfNCCHArchive : public ArchiveBase {
public:
public:
SelfNCCHArchive(Memory& mem) : ArchiveBase(mem) {}
u64 getFreeBytes() override { return 0; }
@ -11,7 +11,7 @@ public:
HorizonResult createFile(const FSPath& path, u64 size) override;
HorizonResult deleteFile(const FSPath& path) override;
Rust::Result<ArchiveBase*, HorizonResult> openArchive(const FSPath& path) override;
std::expected<ArchiveBase*, HorizonResult> openArchive(const FSPath& path) override;
FileDescriptor openFile(const FSPath& path, const FilePerms& perms) override;
std::optional<u32> readFile(FileSession* file, u64 offset, u32 size, u32 dataPointer) override;

4
include/fs/archive_system_save_data.hpp
View file

@ -16,8 +16,8 @@ class SystemSaveDataArchive : public ArchiveBase {
HorizonResult createFile(const FSPath& path, u64 size) override;
HorizonResult deleteFile(const FSPath& path) override;
Rust::Result<ArchiveBase*, HorizonResult> openArchive(const FSPath& path) override;
Rust::Result<DirectorySession, HorizonResult> openDirectory(const FSPath& path) override;
std::expected<ArchiveBase*, HorizonResult> openArchive(const FSPath& path) override;
std::expected<DirectorySession, HorizonResult> openDirectory(const FSPath& path) override;
FileDescriptor openFile(const FSPath& path, const FilePerms& perms) override;

7
include/fs/archive_user_save_data.hpp
View file

@ -3,6 +3,7 @@
class UserSaveDataArchive : public ArchiveBase {
u32 archiveID;
public:
UserSaveDataArchive(Memory& mem, u32 archiveID) : ArchiveBase(mem), archiveID(archiveID) {}
@ -13,13 +14,13 @@ class UserSaveDataArchive : public ArchiveBase {
HorizonResult createFile(const FSPath& path, u64 size) override;
HorizonResult deleteFile(const FSPath& path) override;
Rust::Result<ArchiveBase*, HorizonResult> openArchive(const FSPath& path) override;
Rust::Result<DirectorySession, HorizonResult> openDirectory(const FSPath& path) override;
std::expected<ArchiveBase*, HorizonResult> openArchive(const FSPath& path) override;
std::expected<DirectorySession, HorizonResult> openDirectory(const FSPath& path) override;
FileDescriptor openFile(const FSPath& path, const FilePerms& perms) override;
std::optional<u32> readFile(FileSession* file, u64 offset, u32 size, u32 dataPointer) override;
void format(const FSPath& path, const FormatInfo& info) override;
Rust::Result<FormatInfo, HorizonResult> getFormatInfo(const FSPath& path) override;
std::expected<FormatInfo, HorizonResult> getFormatInfo(const FSPath& path) override;
std::filesystem::path getFormatInfoPath() { return IOFile::getAppData() / "FormatInfo" / "SaveData.format"; }

6
include/services/fs.hpp
View file

@ -38,8 +38,8 @@ class FSService {
SystemSaveDataArchive systemSaveData;
ArchiveBase* getArchiveFromID(u32 id, const FSPath& archivePath);
Rust::Result<Handle, HorizonResult> openArchiveHandle(u32 archiveID, const FSPath& path);
Rust::Result<Handle, HorizonResult> openDirectoryHandle(ArchiveBase* archive, const FSPath& path);
std::expected<Handle, HorizonResult> openArchiveHandle(u32 archiveID, const FSPath& path);
std::expected<Handle, HorizonResult> openDirectoryHandle(ArchiveBase* archive, const FSPath& path);
std::optional<Handle> openFileHandle(ArchiveBase* archive, const FSPath& path, const FSPath& archivePath, const FilePerms& perms);
FSPath readPath(u32 type, u32 pointer, u32 size);
@ -81,7 +81,7 @@ class FSService {
// Used for set/get priority: Not sure what sort of priority this is referring to
u32 priority;
public:
public:
FSService(Memory& mem, Kernel& kernel, const EmulatorConfig& config)
: mem(mem), saveData(mem), sharedExtSaveData_nand(mem, "../SharedFiles/NAND", true), extSaveData_sdmc(mem, "SDMC"), sdmc(mem),
sdmcWriteOnly(mem, true), selfNcch(mem), ncch(mem), userSaveData1(mem, ArchiveID::UserSaveData1),