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Merge pull request #4277 from wwylele/cecd-direct-fs

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cecd: access FS via backend directly
This commit is contained in:
Weiyi Wang 2018-10-01 18:26:51 -04:00 committed by GitHub
commit 0e77cd385a
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 100 additions and 118 deletions
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209
src/core/hle/service/cecd/cecd.cpp
View File

@ -5,6 +5,7 @@
#include <cryptopp/base64.h>
#include <cryptopp/hmac.h>
#include <cryptopp/sha.h>
#include "common/common_paths.h"
#include "common/file_util.h"
#include "common/logging/log.h"
#include "common/string_util.h"
@ -53,11 +54,10 @@ void Module::Interface::Open(Kernel::HLERequestContext& ctx) {
case CecDataPathType::MboxDir:
case CecDataPathType::InboxDir:
case CecDataPathType::OutboxDir: {
auto dir_result =
Service::FS::OpenDirectoryFromArchive(cecd->cecd_system_save_data_archive, path);
auto dir_result = cecd->cecd_system_save_data_archive->OpenDirectory(path);
if (dir_result.Failed()) {
if (open_mode.create) {
Service::FS::CreateDirectoryFromArchive(cecd->cecd_system_save_data_archive, path);
cecd->cecd_system_save_data_archive->CreateDirectory(path);
rb.Push(RESULT_SUCCESS);
} else {
LOG_DEBUG(Service_CECD, "Failed to open directory: {}", path.AsString());
@ -67,40 +67,39 @@ void Module::Interface::Open(Kernel::HLERequestContext& ctx) {
rb.Push<u32>(0); // Zero entries
} else {
constexpr u32 max_entries = 32; // reasonable value, just over max boxes 24
auto directory = dir_result.Unwrap();
auto directory = std::move(dir_result).Unwrap();
// Actual reading into vector seems to be required for entry count
std::vector<FileSys::Entry> entries(max_entries);
const u32 entry_count = directory->backend->Read(max_entries, entries.data());
const u32 entry_count = directory->Read(max_entries, entries.data());
LOG_DEBUG(Service_CECD, "Number of entries found: {}", entry_count);
rb.Push(RESULT_SUCCESS);
rb.Push<u32>(entry_count); // Entry count
directory->backend->Close();
directory->Close();
}
break;
}
default: { // If not directory, then it is a file
auto file_result =
Service::FS::OpenFileFromArchive(cecd->cecd_system_save_data_archive, path, mode);
auto file_result = cecd->cecd_system_save_data_archive->OpenFile(path, mode);
if (file_result.Failed()) {
LOG_DEBUG(Service_CECD, "Failed to open file: {}", path.AsString());
rb.Push(ResultCode(ErrorDescription::NoData, ErrorModule::CEC, ErrorSummary::NotFound,
ErrorLevel::Status));
rb.Push<u32>(0); // No file size
} else {
session_data->file = std::move(file_result.Unwrap());
session_data->file = std::move(file_result).Unwrap();
rb.Push(RESULT_SUCCESS);
rb.Push<u32>(session_data->file->backend->GetSize()); // Return file size
rb.Push<u32>(session_data->file->GetSize()); // Return file size
}
if (path_type == CecDataPathType::MboxProgramId) {
std::vector<u8> program_id(8);
u64_le le_program_id = Kernel::g_current_process->codeset->program_id;
std::memcpy(program_id.data(), &le_program_id, sizeof(u64));
session_data->file->backend->Write(0, sizeof(u64), true, program_id.data());
session_data->file->backend->Close();
session_data->file->Write(0, sizeof(u64), true, program_id.data());
session_data->file->Close();
}
}
}
@ -141,10 +140,10 @@ void Module::Interface::Read(Kernel::HLERequestContext& ctx) {
default: // If not directory, then it is a file
std::vector<u8> buffer(write_buffer_size);
const u32 bytes_read =
session_data->file->backend->Read(0, write_buffer_size, buffer.data()).Unwrap();
session_data->file->Read(0, write_buffer_size, buffer.data()).Unwrap();
write_buffer.Write(buffer.data(), 0, write_buffer_size);
session_data->file->backend->Close();
session_data->file->Close();
rb.Push(RESULT_SUCCESS);
rb.Push<u32>(bytes_read);
@ -176,17 +175,16 @@ void Module::Interface::ReadMessage(Kernel::HLERequestContext& ctx) {
ncch_program_id, id_buffer)
.data();
auto message_result =
Service::FS::OpenFileFromArchive(cecd->cecd_system_save_data_archive, message_path, mode);
auto message_result = cecd->cecd_system_save_data_archive->OpenFile(message_path, mode);
IPC::RequestBuilder rb = rp.MakeBuilder(2, 4);
if (message_result.Succeeded()) {
auto message = message_result.Unwrap();
auto message = std::move(message_result).Unwrap();
std::vector<u8> buffer(buffer_size);
const u32 bytes_read = message->backend->Read(0, buffer_size, buffer.data()).Unwrap();
const u32 bytes_read = message->Read(0, buffer_size, buffer.data()).Unwrap();
write_buffer.Write(buffer.data(), 0, buffer_size);
message->backend->Close();
message->Close();
CecMessageHeader msg_header;
std::memcpy(&msg_header, buffer.data(), sizeof(CecMessageHeader));
@ -246,17 +244,16 @@ void Module::Interface::ReadMessageWithHMAC(Kernel::HLERequestContext& ctx) {
ncch_program_id, id_buffer)
.data();
auto message_result =
Service::FS::OpenFileFromArchive(cecd->cecd_system_save_data_archive, message_path, mode);
auto message_result = cecd->cecd_system_save_data_archive->OpenFile(message_path, mode);
IPC::RequestBuilder rb = rp.MakeBuilder(2, 6);
if (message_result.Succeeded()) {
auto message = message_result.Unwrap();
auto message = std::move(message_result).Unwrap();
std::vector<u8> buffer(buffer_size);
const u32 bytes_read = message->backend->Read(0, buffer_size, buffer.data()).Unwrap();
const u32 bytes_read = message->Read(0, buffer_size, buffer.data()).Unwrap();
write_buffer.Write(buffer.data(), 0, buffer_size);
message->backend->Close();
message->Close();
CecMessageHeader msg_header;
std::memcpy(&msg_header, buffer.data(), sizeof(CecMessageHeader));
@ -346,8 +343,8 @@ void Module::Interface::Write(Kernel::HLERequestContext& ctx) {
std::vector<u8> buffer(read_buffer_size);
read_buffer.Read(buffer.data(), 0, read_buffer_size);
if (session_data->file->backend->GetSize() != read_buffer_size) {
session_data->file->backend->SetSize(read_buffer_size);
if (session_data->file->GetSize() != read_buffer_size) {
session_data->file->SetSize(read_buffer_size);
}
if (session_data->open_mode.check) {
@ -356,8 +353,8 @@ void Module::Interface::Write(Kernel::HLERequestContext& ctx) {
}
const u32 bytes_written =
session_data->file->backend->Write(0, buffer.size(), true, buffer.data()).Unwrap();
session_data->file->backend->Close();
session_data->file->Write(0, buffer.size(), true, buffer.data()).Unwrap();
session_data->file->Close();
rb.Push(RESULT_SUCCESS);
}
@ -388,12 +385,11 @@ void Module::Interface::WriteMessage(Kernel::HLERequestContext& ctx) {
ncch_program_id, id_buffer)
.data();
auto message_result =
Service::FS::OpenFileFromArchive(cecd->cecd_system_save_data_archive, message_path, mode);
auto message_result = cecd->cecd_system_save_data_archive->OpenFile(message_path, mode);
IPC::RequestBuilder rb = rp.MakeBuilder(1, 4);
if (message_result.Succeeded()) {
auto message = message_result.Unwrap();
auto message = std::move(message_result).Unwrap();
std::vector<u8> buffer(buffer_size);
read_buffer.Read(buffer.data(), 0, buffer_size);
@ -418,9 +414,8 @@ void Module::Interface::WriteMessage(Kernel::HLERequestContext& ctx) {
msg_header.sender_id, msg_header.sender_id2, msg_header.send_count,
msg_header.forward_count, msg_header.user_data);
const u32 bytes_written =
message->backend->Write(0, buffer_size, true, buffer.data()).Unwrap();
message->backend->Close();
const u32 bytes_written = message->Write(0, buffer_size, true, buffer.data()).Unwrap();
message->Close();
rb.Push(RESULT_SUCCESS);
} else {
@ -460,12 +455,11 @@ void Module::Interface::WriteMessageWithHMAC(Kernel::HLERequestContext& ctx) {
ncch_program_id, id_buffer)
.data();
auto message_result =
Service::FS::OpenFileFromArchive(cecd->cecd_system_save_data_archive, message_path, mode);
auto message_result = cecd->cecd_system_save_data_archive->OpenFile(message_path, mode);
IPC::RequestBuilder rb = rp.MakeBuilder(1, 6);
if (message_result.Succeeded()) {
auto message = message_result.Unwrap();
auto message = std::move(message_result).Unwrap();
std::vector<u8> buffer(buffer_size);
read_buffer.Read(buffer.data(), 0, buffer_size);
@ -506,9 +500,8 @@ void Module::Interface::WriteMessageWithHMAC(Kernel::HLERequestContext& ctx) {
hmac.CalculateDigest(hmac_digest.data(), message_body.data(), msg_header.body_size);
std::memcpy(buffer.data() + hmac_offset, hmac_digest.data(), hmac_size);
const u32 bytes_written =
message->backend->Write(0, buffer_size, true, buffer.data()).Unwrap();
message->backend->Close();
const u32 bytes_written = message->Write(0, buffer_size, true, buffer.data()).Unwrap();
message->Close();
rb.Push(RESULT_SUCCESS);
} else {
@ -544,12 +537,11 @@ void Module::Interface::Delete(Kernel::HLERequestContext& ctx) {
case CecDataPathType::MboxDir:
case CecDataPathType::InboxDir:
case CecDataPathType::OutboxDir:
rb.Push(Service::FS::DeleteDirectoryRecursivelyFromArchive(
cecd->cecd_system_save_data_archive, path));
rb.Push(cecd->cecd_system_save_data_archive->DeleteDirectoryRecursively(path));
break;
default: // If not directory, then it is a file
if (message_id_size == 0) {
rb.Push(Service::FS::DeleteFileFromArchive(cecd->cecd_system_save_data_archive, path));
rb.Push(cecd->cecd_system_save_data_archive->DeleteFile(path));
} else {
std::vector<u8> id_buffer(message_id_size);
message_id_buffer.Read(id_buffer.data(), 0, message_id_size);
@ -559,8 +551,7 @@ void Module::Interface::Delete(Kernel::HLERequestContext& ctx) {
: CecDataPathType::InboxMsg,
ncch_program_id, id_buffer)
.data();
rb.Push(Service::FS::DeleteFileFromArchive(cecd->cecd_system_save_data_archive,
message_path));
rb.Push(cecd->cecd_system_save_data_archive->DeleteFile(message_path));
}
}
@ -587,17 +578,16 @@ void Module::Interface::SetData(Kernel::HLERequestContext& ctx) {
mode.write_flag.Assign(1);
mode.create_flag.Assign(1);
auto file_result =
Service::FS::OpenFileFromArchive(cecd->cecd_system_save_data_archive, path, mode);
auto file_result = cecd->cecd_system_save_data_archive->OpenFile(path, mode);
if (file_result.Succeeded()) {
auto file = file_result.Unwrap();
auto file = std::move(file_result).Unwrap();
std::vector<u8> buffer(buffer_size);
read_buffer.Read(buffer.data(), 0, buffer_size);
cecd->CheckAndUpdateFile(CecDataPathType::OutboxIndex, ncch_program_id, buffer);
file->backend->Write(0, buffer.size(), true, buffer.data());
file->backend->Close();
file->Write(0, buffer.size(), true, buffer.data());
file->Close();
}
}
@ -735,25 +725,23 @@ void Module::Interface::OpenAndWrite(Kernel::HLERequestContext& ctx) {
ErrorSummary::NotFound, ErrorLevel::Status));
break;
default: // If not directory, then it is a file
auto file_result =
Service::FS::OpenFileFromArchive(cecd->cecd_system_save_data_archive, path, mode);
auto file_result = cecd->cecd_system_save_data_archive->OpenFile(path, mode);
if (file_result.Succeeded()) {
auto file = file_result.Unwrap();
auto file = std::move(file_result).Unwrap();
std::vector<u8> buffer(buffer_size);
read_buffer.Read(buffer.data(), 0, buffer_size);
if (file->backend->GetSize() != buffer_size) {
file->backend->SetSize(buffer_size);
if (file->GetSize() != buffer_size) {
file->SetSize(buffer_size);
}
if (open_mode.check) {
cecd->CheckAndUpdateFile(path_type, ncch_program_id, buffer);
}
const u32 bytes_written =
file->backend->Write(0, buffer.size(), true, buffer.data()).Unwrap();
file->backend->Close();
const u32 bytes_written = file->Write(0, buffer.size(), true, buffer.data()).Unwrap();
file->Close();
rb.Push(RESULT_SUCCESS);
} else {
@ -796,15 +784,14 @@ void Module::Interface::OpenAndRead(Kernel::HLERequestContext& ctx) {
rb.Push<u32>(0); // No entries read
break;
default: // If not directory, then it is a file
auto file_result =
Service::FS::OpenFileFromArchive(cecd->cecd_system_save_data_archive, path, mode);
auto file_result = cecd->cecd_system_save_data_archive->OpenFile(path, mode);
if (file_result.Succeeded()) {
auto file = file_result.Unwrap();
auto file = std::move(file_result).Unwrap();
std::vector<u8> buffer(buffer_size);
const u32 bytes_read = file->backend->Read(0, buffer_size, buffer.data()).Unwrap();
const u32 bytes_read = file->Read(0, buffer_size, buffer.data()).Unwrap();
write_buffer.Write(buffer.data(), 0, buffer_size);
file->backend->Close();
file->Close();
rb.Push(RESULT_SUCCESS);
rb.Push<u32>(bytes_read);
@ -1003,13 +990,12 @@ void Module::CheckAndUpdateFile(const CecDataPathType path_type, const u32 ncch_
FileSys::Path root_path(
GetCecDataPathTypeAsString(CecDataPathType::RootDir, 0).data());
auto dir_result =
Service::FS::OpenDirectoryFromArchive(cecd_system_save_data_archive, root_path);
auto dir_result = cecd_system_save_data_archive->OpenDirectory(root_path);
auto root_dir = dir_result.Unwrap();
auto root_dir = std::move(dir_result).Unwrap();
std::vector<FileSys::Entry> entries(max_num_boxes + 1); // + 1 mboxlist
const u32 entry_count = root_dir->backend->Read(max_num_boxes + 1, entries.data());
root_dir->backend->Close();
const u32 entry_count = root_dir->Read(max_num_boxes + 1, entries.data());
root_dir->Close();
LOG_DEBUG(Service_CECD, "Number of entries found in /CEC: {}", entry_count);
@ -1193,14 +1179,13 @@ void Module::CheckAndUpdateFile(const CecDataPathType path_type, const u32 ncch_
FileSys::Path outbox_path(
GetCecDataPathTypeAsString(CecDataPathType::OutboxDir, ncch_program_id).data());
auto dir_result =
Service::FS::OpenDirectoryFromArchive(cecd_system_save_data_archive, outbox_path);
auto dir_result = cecd_system_save_data_archive->OpenDirectory(outbox_path);
auto outbox_dir = dir_result.Unwrap();
auto outbox_dir = std::move(dir_result).Unwrap();
std::vector<FileSys::Entry> entries(outbox_info_header.max_message_num + 2);
const u32 entry_count =
outbox_dir->backend->Read(outbox_info_header.max_message_num + 2, entries.data());
outbox_dir->backend->Close();
outbox_dir->Read(outbox_info_header.max_message_num + 2, entries.data());
outbox_dir->Close();
LOG_DEBUG(Service_CECD, "Number of entries found in /OutBox: {}", entry_count);
std::array<CecMessageHeader, 8> message_headers;
@ -1225,15 +1210,14 @@ void Module::CheckAndUpdateFile(const CecDataPathType path_type, const u32 ncch_
FileSys::Mode mode;
mode.read_flag.Assign(1);
auto message_result = Service::FS::OpenFileFromArchive(
cecd_system_save_data_archive, message_path, mode);
auto message_result = cecd_system_save_data_archive->OpenFile(message_path, mode);
auto message = message_result.Unwrap();
const u32 message_size = message->backend->GetSize();
auto message = std::move(message_result).Unwrap();
const u32 message_size = message->GetSize();
std::vector<u8> buffer(message_size);
message->backend->Read(0, message_size, buffer.data()).Unwrap();
message->backend->Close();
message->Read(0, message_size, buffer.data()).Unwrap();
message->Close();
std::memcpy(&message_headers[outbox_info_header.message_num++], buffer.data(),
sizeof(CecMessageHeader));
@ -1288,13 +1272,12 @@ void Module::CheckAndUpdateFile(const CecDataPathType path_type, const u32 ncch_
FileSys::Path outbox_path(
GetCecDataPathTypeAsString(CecDataPathType::OutboxDir, ncch_program_id).data());
auto dir_result =
Service::FS::OpenDirectoryFromArchive(cecd_system_save_data_archive, outbox_path);
auto dir_result = cecd_system_save_data_archive->OpenDirectory(outbox_path);
auto outbox_dir = dir_result.Unwrap();
auto outbox_dir = std::move(dir_result).Unwrap();
std::vector<FileSys::Entry> entries(8);
const u32 entry_count = outbox_dir->backend->Read(8, entries.data());
outbox_dir->backend->Close();
const u32 entry_count = outbox_dir->Read(8, entries.data());
outbox_dir->Close();
LOG_DEBUG(Service_CECD, "Number of entries found in /OutBox: {}", entry_count);
std::array<std::array<u8, 8>, 8> message_ids;
@ -1317,15 +1300,14 @@ void Module::CheckAndUpdateFile(const CecDataPathType path_type, const u32 ncch_
FileSys::Mode mode;
mode.read_flag.Assign(1);
auto message_result = Service::FS::OpenFileFromArchive(
cecd_system_save_data_archive, message_path, mode);
auto message_result = cecd_system_save_data_archive->OpenFile(message_path, mode);
auto message = message_result.Unwrap();
const u32 message_size = message->backend->GetSize();
auto message = std::move(message_result).Unwrap();
const u32 message_size = message->GetSize();
std::vector<u8> buffer(message_size);
message->backend->Read(0, message_size, buffer.data()).Unwrap();
message->backend->Close();
message->Read(0, message_size, buffer.data()).Unwrap();
message->Close();
// Message id is at offset 0x20, and is 8 bytes
std::memcpy(&message_ids[obindex_header.message_num++], buffer.data() + 0x20, 8);
@ -1362,7 +1344,7 @@ Module::SessionData::SessionData() {}
Module::SessionData::~SessionData() {
if (file)
file->backend->Close();
file->Close();
}
Module::Interface::Interface(std::shared_ptr<Module> cecd, const char* name, u32 max_session)
@ -1373,26 +1355,29 @@ Module::Module() {
cecinfo_event = Event::Create(Kernel::ResetType::OneShot, "CECD::cecinfo_event");
change_state_event = Event::Create(Kernel::ResetType::OneShot, "CECD::change_state_event");
std::string nand_directory = FileUtil::GetUserPath(FileUtil::UserPath::NANDDir);
FileSys::ArchiveFactory_SystemSaveData systemsavedata_factory(nand_directory);
// Open the SystemSaveData archive 0x00010026
FileSys::Path archive_path(cecd_system_savedata_id);
auto archive_result =
Service::FS::OpenArchive(Service::FS::ArchiveIdCode::SystemSaveData, archive_path);
auto archive_result = systemsavedata_factory.Open(archive_path);
// If the archive didn't exist, create the files inside
if (archive_result.Code() == FileSys::ERR_NOT_FORMATTED) {
if (archive_result.Code() != FileSys::ERR_NOT_FORMATTED) {
ASSERT_MSG(archive_result.Succeeded(), "Could not open the CECD SystemSaveData archive!");
cecd_system_save_data_archive = std::move(archive_result).Unwrap();
} else {
// Format the archive to create the directories
Service::FS::FormatArchive(Service::FS::ArchiveIdCode::SystemSaveData,
FileSys::ArchiveFormatInfo(), archive_path);
systemsavedata_factory.Format(archive_path, FileSys::ArchiveFormatInfo());
// Open it again to get a valid archive now that the folder exists
archive_result =
Service::FS::OpenArchive(Service::FS::ArchiveIdCode::SystemSaveData, archive_path);
cecd_system_save_data_archive = systemsavedata_factory.Open(archive_path).Unwrap();
/// Now that the archive is formatted, we need to create the root CEC directory,
/// eventlog.dat, and CEC/MBoxList____
const FileSys::Path root_dir_path(
GetCecDataPathTypeAsString(CecDataPathType::RootDir, 0).data());
Service::FS::CreateDirectoryFromArchive(*archive_result, root_dir_path);
cecd_system_save_data_archive->CreateDirectory(root_dir_path);
FileSys::Mode mode;
mode.write_flag.Assign(1);
@ -1405,11 +1390,10 @@ Module::Module() {
/// region yet.
FileSys::Path eventlog_path("/eventlog.dat");
auto eventlog_result =
Service::FS::OpenFileFromArchive(*archive_result, eventlog_path, mode);
auto eventlog_result = cecd_system_save_data_archive->OpenFile(eventlog_path, mode);
constexpr u32 eventlog_size = 0x30d54;
auto eventlog = eventlog_result.Unwrap();
auto eventlog = std::move(eventlog_result).Unwrap();
std::vector<u8> eventlog_buffer(eventlog_size);
std::memset(&eventlog_buffer[0], 0, 0x1000);
@ -1417,8 +1401,8 @@ Module::Module() {
eventlog_buffer[1] = 0x41;
eventlog_buffer[2] = 0x12;
eventlog->backend->Write(0, eventlog_size, true, eventlog_buffer.data());
eventlog->backend->Close();
eventlog->Write(0, eventlog_size, true, eventlog_buffer.data());
eventlog->Close();
/// MBoxList____ resides within the root CEC/ directory.
/// Initially created, at offset 0x0, are bytes 0x68 0x68 0x00 0x00 0x01, with 0x6868 'hh',
@ -1427,11 +1411,10 @@ Module::Module() {
FileSys::Path mboxlist_path(
GetCecDataPathTypeAsString(CecDataPathType::MboxList, 0).data());
auto mboxlist_result =
Service::FS::OpenFileFromArchive(*archive_result, mboxlist_path, mode);
auto mboxlist_result = cecd_system_save_data_archive->OpenFile(mboxlist_path, mode);
constexpr u32 mboxlist_size = 0x18c;
auto mboxlist = mboxlist_result.Unwrap();
auto mboxlist = std::move(mboxlist_result).Unwrap();
std::vector<u8> mboxlist_buffer(mboxlist_size);
std::memset(&mboxlist_buffer[0], 0, mboxlist_size);
@ -1440,18 +1423,12 @@ Module::Module() {
// mboxlist_buffer[2-3] are already zeroed
mboxlist_buffer[4] = 0x01;
mboxlist->backend->Write(0, mboxlist_size, true, mboxlist_buffer.data());
mboxlist->backend->Close();
mboxlist->Write(0, mboxlist_size, true, mboxlist_buffer.data());
mboxlist->Close();
}
ASSERT_MSG(archive_result.Succeeded(), "Could not open the CECD SystemSaveData archive!");
cecd_system_save_data_archive = *archive_result;
}
Module::~Module() {
if (cecd_system_save_data_archive)
Service::FS::CloseArchive(cecd_system_save_data_archive);
}
Module::~Module() = default;
void InstallInterfaces(SM::ServiceManager& service_manager) {
auto cecd = std::make_shared<Module>();

9
src/core/hle/service/cecd/cecd.h
View File

@ -10,6 +10,11 @@
#include "core/hle/service/fs/archive.h"
#include "core/hle/service/service.h"
namespace FileSys {
class ArchiveBackend;
class FileBackend;
} // namespace FileSys
namespace Service::CECD {
class Module final {
@ -237,7 +242,7 @@ public:
CecOpenMode open_mode;
FileSys::Path path;
std::shared_ptr<Service::FS::File> file;
std::unique_ptr<FileSys::FileBackend> file;
};
class Interface : public ServiceFramework<Interface, SessionData> {
@ -597,7 +602,7 @@ private:
void CheckAndUpdateFile(const CecDataPathType path_type, const u32 ncch_program_id,
std::vector<u8>& file_buffer);
Service::FS::ArchiveHandle cecd_system_save_data_archive;
std::unique_ptr<FileSys::ArchiveBackend> cecd_system_save_data_archive;
Kernel::SharedPtr<Kernel::Event> cecinfo_event;
Kernel::SharedPtr<Kernel::Event> change_state_event;