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Merge pull request #5088 from zhaowenlan1779/layered-fs

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core/file_sys: LayeredFS support
This commit is contained in:
Pengfei Zhu 2020-02-25 07:48:10 +08:00 committed by GitHub
commit 5b54a99f96
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GPG Key ID: 4AEE18F83AFDEB23
16 changed files with 950 additions and 31 deletions
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13
src/citra_qt/game_list.cpp
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@ -468,6 +468,8 @@ void GameList::AddGamePopup(QMenu& context_menu, const QString& path, u64 progra
QAction* open_texture_dump_location = context_menu.addAction(tr("Open Texture Dump Location"));
QAction* open_texture_load_location =
context_menu.addAction(tr("Open Custom Texture Location"));
QAction* open_mods_location = context_menu.addAction(tr("Open Mods Location"));
QAction* dump_romfs = context_menu.addAction(tr("Dump RomFS"));
QAction* navigate_to_gamedb_entry = context_menu.addAction(tr("Navigate to GameDB entry"));
const bool is_application =
@ -497,6 +499,8 @@ void GameList::AddGamePopup(QMenu& context_menu, const QString& path, u64 progra
open_texture_dump_location->setVisible(is_application);
open_texture_load_location->setVisible(is_application);
open_mods_location->setVisible(is_application);
dump_romfs->setVisible(is_application);
navigate_to_gamedb_entry->setVisible(it != compatibility_list.end());
@ -526,6 +530,15 @@ void GameList::AddGamePopup(QMenu& context_menu, const QString& path, u64 progra
emit OpenFolderRequested(program_id, GameListOpenTarget::TEXTURE_LOAD);
}
});
connect(open_mods_location, &QAction::triggered, [this, program_id] {
if (FileUtil::CreateFullPath(fmt::format("{}mods/{:016X}/",
FileUtil::GetUserPath(FileUtil::UserPath::LoadDir),
program_id))) {
emit OpenFolderRequested(program_id, GameListOpenTarget::MODS);
}
});
connect(dump_romfs, &QAction::triggered,
[this, path, program_id] { emit DumpRomFSRequested(path, program_id); });
connect(navigate_to_gamedb_entry, &QAction::triggered, [this, program_id]() {
emit NavigateToGamedbEntryRequested(program_id, compatibility_list);
});

4
src/citra_qt/game_list.h
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@ -35,7 +35,8 @@ enum class GameListOpenTarget {
APPLICATION = 2,
UPDATE_DATA = 3,
TEXTURE_DUMP = 4,
TEXTURE_LOAD = 5
TEXTURE_LOAD = 5,
MODS = 6,
};
class GameList : public QWidget {
@ -81,6 +82,7 @@ signals:
void OpenFolderRequested(u64 program_id, GameListOpenTarget target);
void NavigateToGamedbEntryRequested(u64 program_id,
const CompatibilityList& compatibility_list);
void DumpRomFSRequested(QString game_path, u64 program_id);
void OpenDirectory(const QString& directory);
void AddDirectory();
void ShowList(bool show);

46
src/citra_qt/main.cpp
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@ -568,6 +568,7 @@ void GMainWindow::ConnectWidgetEvents() {
connect(game_list, &GameList::OpenFolderRequested, this, &GMainWindow::OnGameListOpenFolder);
connect(game_list, &GameList::NavigateToGamedbEntryRequested, this,
&GMainWindow::OnGameListNavigateToGamedbEntry);
connect(game_list, &GameList::DumpRomFSRequested, this, &GMainWindow::OnGameListDumpRomFS);
connect(game_list, &GameList::AddDirectory, this, &GMainWindow::OnGameListAddDirectory);
connect(game_list_placeholder, &GameListPlaceholder::AddDirectory, this,
&GMainWindow::OnGameListAddDirectory);
@ -1144,6 +1145,11 @@ void GMainWindow::OnGameListOpenFolder(u64 data_id, GameListOpenTarget target) {
path = fmt::format("{}textures/{:016X}/",
FileUtil::GetUserPath(FileUtil::UserPath::LoadDir), data_id);
break;
case GameListOpenTarget::MODS:
open_target = "Mods";
path = fmt::format("{}mods/{:016X}/", FileUtil::GetUserPath(FileUtil::UserPath::LoadDir),
data_id);
break;
default:
LOG_ERROR(Frontend, "Unexpected target {}", static_cast<int>(target));
return;
@ -1175,6 +1181,46 @@ void GMainWindow::OnGameListNavigateToGamedbEntry(u64 program_id,
QDesktopServices::openUrl(QUrl(QStringLiteral("https://citra-emu.org/game/") + directory));
}
void GMainWindow::OnGameListDumpRomFS(QString game_path, u64 program_id) {
auto* dialog = new QProgressDialog(tr("Dumping..."), tr("Cancel"), 0, 0, this);
dialog->setWindowModality(Qt::WindowModal);
dialog->setWindowFlags(dialog->windowFlags() &
~(Qt::WindowCloseButtonHint | Qt::WindowContextHelpButtonHint));
dialog->setCancelButton(nullptr);
dialog->setMinimumDuration(0);
dialog->setValue(0);
const auto base_path = fmt::format(
"{}romfs/{:016X}", FileUtil::GetUserPath(FileUtil::UserPath::DumpDir), program_id);
const auto update_path =
fmt::format("{}romfs/{:016X}", FileUtil::GetUserPath(FileUtil::UserPath::DumpDir),
program_id | 0x0004000e00000000);
using FutureWatcher = QFutureWatcher<std::pair<Loader::ResultStatus, Loader::ResultStatus>>;
auto* future_watcher = new FutureWatcher(this);
connect(future_watcher, &FutureWatcher::finished,
[this, program_id, dialog, base_path, update_path, future_watcher] {
dialog->hide();
const auto& [base, update] = future_watcher->result();
if (base != Loader::ResultStatus::Success) {
QMessageBox::critical(
this, tr("Citra"),
tr("Could not dump base RomFS.\nRefer to the log for details."));
return;
}
QDesktopServices::openUrl(QUrl::fromLocalFile(QString::fromStdString(base_path)));
if (update == Loader::ResultStatus::Success) {
QDesktopServices::openUrl(
QUrl::fromLocalFile(QString::fromStdString(update_path)));
}
});
auto future = QtConcurrent::run([game_path, base_path, update_path] {
std::unique_ptr<Loader::AppLoader> loader = Loader::GetLoader(game_path.toStdString());
return std::make_pair(loader->DumpRomFS(base_path), loader->DumpUpdateRomFS(update_path));
});
future_watcher->setFuture(future);
}
void GMainWindow::OnGameListOpenDirectory(const QString& directory) {
QString path;
if (directory == QStringLiteral("INSTALLED")) {

1
src/citra_qt/main.h
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@ -169,6 +169,7 @@ private slots:
void OnGameListOpenFolder(u64 program_id, GameListOpenTarget target);
void OnGameListNavigateToGamedbEntry(u64 program_id,
const CompatibilityList& compatibility_list);
void OnGameListDumpRomFS(QString game_path, u64 program_id);
void OnGameListOpenDirectory(const QString& directory);
void OnGameListAddDirectory();
void OnGameListShowList(bool show);

2
src/core/CMakeLists.txt
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@ -72,6 +72,8 @@ add_library(core STATIC
file_sys/delay_generator.h
file_sys/ivfc_archive.cpp
file_sys/ivfc_archive.h
file_sys/layered_fs.cpp
file_sys/layered_fs.h
file_sys/ncch_container.cpp
file_sys/ncch_container.h
file_sys/patch.cpp

1
src/core/core.cpp
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@ -433,6 +433,7 @@ void System::Shutdown() {
perf_stats.reset();
rpc_server.reset();
cheat_engine.reset();
archive_manager.reset();
service_manager.reset();
dsp_core.reset();
cpu_cores.clear();

604
src/core/file_sys/layered_fs.cpp Normal file
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@ -0,0 +1,604 @@
// Copyright 2020 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <algorithm>
#include <cstring>
#include "common/alignment.h"
#include "common/assert.h"
#include "common/common_paths.h"
#include "common/file_util.h"
#include "common/string_util.h"
#include "common/swap.h"
#include "core/file_sys/layered_fs.h"
#include "core/file_sys/patch.h"
namespace FileSys {
struct FileRelocationInfo {
int type; // 0 - none, 1 - replaced / created, 2 - patched, 3 - removed
u64 original_offset; // Type 0. Offset is absolute
std::string replace_file_path; // Type 1
std::vector<u8> patched_file; // Type 2
u64 size; // Relocated file size
};
struct LayeredFS::File {
std::string name;
std::string path;
FileRelocationInfo relocation{};
Directory* parent;
};
struct DirectoryMetadata {
u32_le parent_directory_offset;
u32_le next_sibling_offset;
u32_le first_child_directory_offset;
u32_le first_file_offset;
u32_le hash_bucket_next;
u32_le name_length;
// Followed by a name of name length (aligned up to 4)
};
static_assert(sizeof(DirectoryMetadata) == 0x18, "Size of DirectoryMetadata is not correct");
struct FileMetadata {
u32_le parent_directory_offset;
u32_le next_sibling_offset;
u64_le file_data_offset;
u64_le file_data_length;
u32_le hash_bucket_next;
u32_le name_length;
// Followed by a name of name length (aligned up to 4)
};
static_assert(sizeof(FileMetadata) == 0x20, "Size of FileMetadata is not correct");
LayeredFS::LayeredFS(std::shared_ptr<RomFSReader> romfs_, std::string patch_path_,
std::string patch_ext_path_, bool load_relocations)
: romfs(std::move(romfs_)), patch_path(std::move(patch_path_)),
patch_ext_path(std::move(patch_ext_path_)) {
romfs->ReadFile(0, sizeof(header), reinterpret_cast<u8*>(&header));
ASSERT_MSG(header.header_length == sizeof(header), "Header size is incorrect");
// TODO: is root always the first directory in table?
root.parent = &root;
LoadDirectory(root, 0);
if (load_relocations) {
LoadRelocations();
LoadExtRelocations();
}
RebuildMetadata();
}
LayeredFS::~LayeredFS() = default;
void LayeredFS::LoadDirectory(Directory& current, u32 offset) {
DirectoryMetadata metadata;
romfs->ReadFile(header.directory_metadata_table.offset + offset, sizeof(metadata),
reinterpret_cast<u8*>(&metadata));
current.name = ReadName(header.directory_metadata_table.offset + offset + sizeof(metadata),
metadata.name_length);
current.path = current.parent->path + current.name + DIR_SEP;
directory_path_map.emplace(current.path, &current);
if (metadata.first_file_offset != 0xFFFFFFFF) {
LoadFile(current, metadata.first_file_offset);
}
if (metadata.first_child_directory_offset != 0xFFFFFFFF) {
auto child = std::make_unique<Directory>();
auto& directory = *child;
directory.parent = &current;
current.directories.emplace_back(std::move(child));
LoadDirectory(directory, metadata.first_child_directory_offset);
}
if (metadata.next_sibling_offset != 0xFFFFFFFF) {
auto sibling = std::make_unique<Directory>();
auto& directory = *sibling;
directory.parent = current.parent;
current.parent->directories.emplace_back(std::move(sibling));
LoadDirectory(directory, metadata.next_sibling_offset);
}
}
void LayeredFS::LoadFile(Directory& parent, u32 offset) {
FileMetadata metadata;
romfs->ReadFile(header.file_metadata_table.offset + offset, sizeof(metadata),
reinterpret_cast<u8*>(&metadata));
auto file = std::make_unique<File>();
file->name = ReadName(header.file_metadata_table.offset + offset + sizeof(metadata),
metadata.name_length);
file->path = parent.path + file->name;
file->relocation.original_offset = header.file_data_offset + metadata.file_data_offset;
file->relocation.size = metadata.file_data_length;
file->parent = &parent;
file_path_map.emplace(file->path, file.get());
parent.files.emplace_back(std::move(file));
if (metadata.next_sibling_offset != 0xFFFFFFFF) {
LoadFile(parent, metadata.next_sibling_offset);
}
}
std::string LayeredFS::ReadName(u32 offset, u32 name_length) {
std::vector<u16_le> buffer(name_length / sizeof(u16_le));
romfs->ReadFile(offset, name_length, reinterpret_cast<u8*>(buffer.data()));
std::u16string name(buffer.size(), 0);
std::transform(buffer.begin(), buffer.end(), name.begin(), [](u16_le character) {
return static_cast<char16_t>(static_cast<u16>(character));
});
return Common::UTF16ToUTF8(name);
}
void LayeredFS::LoadRelocations() {
if (!FileUtil::Exists(patch_path)) {
return;
}
const FileUtil::DirectoryEntryCallable callback = [this,
&callback](u64* /*num_entries_out*/,
const std::string& directory,
const std::string& virtual_name) {
auto* parent = directory_path_map.at(directory.substr(patch_path.size() - 1));
if (FileUtil::IsDirectory(directory + virtual_name + DIR_SEP)) {
const auto path = (directory + virtual_name + DIR_SEP).substr(patch_path.size() - 1);
if (!directory_path_map.count(path)) { // Add this directory
auto directory = std::make_unique<Directory>();
directory->name = virtual_name;
directory->path = path;
directory->parent = parent;
directory_path_map.emplace(path, directory.get());
parent->directories.emplace_back(std::move(directory));
LOG_INFO(Service_FS, "LayeredFS created directory {}", path);
}
return FileUtil::ForeachDirectoryEntry(nullptr, directory + virtual_name + DIR_SEP,
callback);
}
const auto path = (directory + virtual_name).substr(patch_path.size() - 1);
if (!file_path_map.count(path)) { // Newly created file
auto file = std::make_unique<File>();
file->name = virtual_name;
file->path = path;
file->parent = parent;
file_path_map.emplace(path, file.get());
parent->files.emplace_back(std::move(file));
LOG_INFO(Service_FS, "LayeredFS created file {}", path);
}
auto* file = file_path_map.at(path);
file->relocation.type = 1;
file->relocation.replace_file_path = directory + virtual_name;
file->relocation.size = FileUtil::GetSize(directory + virtual_name);
LOG_INFO(Service_FS, "LayeredFS replacement file in use for {}", path);
return true;
};
FileUtil::ForeachDirectoryEntry(nullptr, patch_path, callback);
}
void LayeredFS::LoadExtRelocations() {
if (!FileUtil::Exists(patch_ext_path)) {
return;
}
if (patch_ext_path.back() == '/' || patch_ext_path.back() == '\\') {
// ScanDirectoryTree expects a path without trailing '/'
patch_ext_path.erase(patch_ext_path.size() - 1, 1);
}
FileUtil::FSTEntry result;
FileUtil::ScanDirectoryTree(patch_ext_path, result, 256);
for (const auto& entry : result.children) {
if (FileUtil::IsDirectory(entry.physicalName)) {
continue;
}
const auto path = entry.physicalName.substr(patch_ext_path.size());
if (path.size() >= 5 && path.substr(path.size() - 5) == ".stub") {
// Remove the corresponding file if exists
const auto file_path = path.substr(0, path.size() - 5);
if (file_path_map.count(file_path)) {
auto& file = *file_path_map[file_path];
file.relocation.type = 3;
file.relocation.size = 0;
file_path_map.erase(file_path);
LOG_INFO(Service_FS, "LayeredFS removed file {}", file_path);
} else {
LOG_WARNING(Service_FS, "LayeredFS file for stub {} not found", path);
}
} else if (path.size() >= 4) {
const auto extension = path.substr(path.size() - 4);
if (extension != ".ips" && extension != ".bps") {
LOG_WARNING(Service_FS, "LayeredFS unknown ext file {}", path);
}
const auto file_path = path.substr(0, path.size() - 4);
if (!file_path_map.count(file_path)) {
LOG_WARNING(Service_FS, "LayeredFS original file for patch {} not found", path);
continue;
}
FileUtil::IOFile patch_file(entry.physicalName, "rb");
if (!patch_file) {
LOG_ERROR(Service_FS, "LayeredFS Could not open file {}", entry.physicalName);
continue;
}
const auto size = patch_file.GetSize();
std::vector<u8> patch(size);
if (patch_file.ReadBytes(patch.data(), size) != size) {
LOG_ERROR(Service_FS, "LayeredFS Could not read file {}", entry.physicalName);
continue;
}
auto& file = *file_path_map[file_path];
std::vector<u8> buffer(file.relocation.size); // Original size
romfs->ReadFile(file.relocation.original_offset, buffer.size(), buffer.data());
bool ret = false;
if (extension == ".ips") {
ret = Patch::ApplyIpsPatch(patch, buffer);
} else {
ret = Patch::ApplyBpsPatch(patch, buffer);
}
if (ret) {
LOG_INFO(Service_FS, "LayeredFS patched file {}", file_path);
file.relocation.type = 2;
file.relocation.size = buffer.size();
file.relocation.patched_file = std::move(buffer);
} else {
LOG_ERROR(Service_FS, "LayeredFS failed to patch file {}", file_path);
}
} else {
LOG_WARNING(Service_FS, "LayeredFS unknown ext file {}", path);
}
}
}
std::size_t GetNameSize(const std::string& name) {
std::u16string u16name = Common::UTF8ToUTF16(name);
return Common::AlignUp(u16name.size() * 2, 4);
}
void LayeredFS::PrepareBuildDirectory(Directory& current) {
directory_metadata_offset_map.emplace(&current, current_directory_offset);
directory_list.emplace_back(&current);
current_directory_offset += sizeof(DirectoryMetadata) + GetNameSize(current.name);
}
void LayeredFS::PrepareBuildFile(File& current) {
if (current.relocation.type == 3) { // Deleted files are not counted
return;
}
file_metadata_offset_map.emplace(&current, current_file_offset);
file_list.emplace_back(&current);
current_file_offset += sizeof(FileMetadata) + GetNameSize(current.name);
}
void LayeredFS::PrepareBuild(Directory& current) {
for (const auto& child : current.files) {
PrepareBuildFile(*child);
}
for (const auto& child : current.directories) {
PrepareBuildDirectory(*child);
}
for (const auto& child : current.directories) {
PrepareBuild(*child);
}
}
// Implementation from 3dbrew
u32 CalcHash(const std::string& name, u32 parent_offset) {
u32 hash = parent_offset ^ 123456789;
std::u16string u16name = Common::UTF8ToUTF16(name);
for (char16_t c : u16name) {
hash = (hash >> 5) | (hash << 27);
hash ^= static_cast<u16>(c);
}
return hash;
}
std::size_t WriteName(u8* dest, std::u16string name) {
const auto buffer_size = Common::AlignUp(name.size() * 2, 4);
std::vector<u16_le> buffer(buffer_size / 2);
std::transform(name.begin(), name.end(), buffer.begin(), [](char16_t character) {
return static_cast<u16_le>(static_cast<u16>(character));
});
std::memcpy(dest, buffer.data(), buffer_size);
return buffer_size;
}
void LayeredFS::BuildDirectories() {
directory_metadata_table.resize(current_directory_offset, 0xFF);
std::size_t written = 0;
for (const auto& directory : directory_list) {
DirectoryMetadata metadata;
std::memset(&metadata, 0xFF, sizeof(metadata));
metadata.parent_directory_offset = directory_metadata_offset_map.at(directory->parent);
if (directory->parent != directory) {
bool flag = false;
for (const auto& sibling : directory->parent->directories) {
if (flag) {
metadata.next_sibling_offset = directory_metadata_offset_map.at(sibling.get());
break;
} else if (sibling.get() == directory) {
flag = true;
}
}
}
if (!directory->directories.empty()) {
metadata.first_child_directory_offset =
directory_metadata_offset_map.at(directory->directories.front().get());
}
if (!directory->files.empty()) {
metadata.first_file_offset =
file_metadata_offset_map.at(directory->files.front().get());
}
const auto bucket = CalcHash(directory->name, metadata.parent_directory_offset) %
directory_hash_table.size();
metadata.hash_bucket_next = directory_hash_table[bucket];
directory_hash_table[bucket] = directory_metadata_offset_map.at(directory);
// Write metadata and name
std::u16string u16name = Common::UTF8ToUTF16(directory->name);
metadata.name_length = u16name.size() * 2;
std::memcpy(directory_metadata_table.data() + written, &metadata, sizeof(metadata));
written += sizeof(metadata);
written += WriteName(directory_metadata_table.data() + written, u16name);
}
ASSERT_MSG(written == directory_metadata_table.size(),
"Calculated size for directory metadata table is wrong");
}
void LayeredFS::BuildFiles() {
file_metadata_table.resize(current_file_offset, 0xFF);
std::size_t written = 0;
for (const auto& file : file_list) {
FileMetadata metadata;
std::memset(&metadata, 0xFF, sizeof(metadata));
metadata.parent_directory_offset = directory_metadata_offset_map.at(file->parent);
bool flag = false;
for (const auto& sibling : file->parent->files) {
if (sibling->relocation.type == 3) { // removed file
continue;
}
if (flag) {
metadata.next_sibling_offset = file_metadata_offset_map.at(sibling.get());
break;
} else if (sibling.get() == file) {
flag = true;
}
}
metadata.file_data_offset = current_data_offset;
metadata.file_data_length = file->relocation.size;
current_data_offset += Common::AlignUp(metadata.file_data_length, 16);
if (metadata.file_data_length != 0) {
data_offset_map.emplace(metadata.file_data_offset, file);
}
const auto bucket =
CalcHash(file->name, metadata.parent_directory_offset) % file_hash_table.size();
metadata.hash_bucket_next = file_hash_table[bucket];
file_hash_table[bucket] = file_metadata_offset_map.at(file);
// Write metadata and name
std::u16string u16name = Common::UTF8ToUTF16(file->name);
metadata.name_length = u16name.size() * 2;
std::memcpy(file_metadata_table.data() + written, &metadata, sizeof(metadata));
written += sizeof(metadata);
written += WriteName(file_metadata_table.data() + written, u16name);
}
ASSERT_MSG(written == file_metadata_table.size(),
"Calculated size for file metadata table is wrong");
}
// Implementation from 3dbrew
std::size_t GetHashTableSize(std::size_t entry_count) {
if (entry_count < 3) {
return 3;
} else if (entry_count < 19) {
return entry_count | 1;
} else {
std::size_t count = entry_count;
while (count % 2 == 0 || count % 3 == 0 || count % 5 == 0 || count % 7 == 0 ||
count % 11 == 0 || count % 13 == 0 || count % 17 == 0) {
count++;
}
return count;
}
}
void LayeredFS::RebuildMetadata() {
PrepareBuildDirectory(root);
PrepareBuild(root);
directory_hash_table.resize(GetHashTableSize(directory_list.size()), 0xFFFFFFFF);
file_hash_table.resize(GetHashTableSize(file_list.size()), 0xFFFFFFFF);
BuildDirectories();
BuildFiles();
// Create header
RomFSHeader header;
header.header_length = sizeof(header);
header.directory_hash_table = {
/*offset*/ sizeof(header),
/*length*/ static_cast<u32_le>(directory_hash_table.size() * sizeof(u32_le))};
header.directory_metadata_table = {
/*offset*/
header.directory_hash_table.offset + header.directory_hash_table.length,
/*length*/ static_cast<u32_le>(directory_metadata_table.size())};
header.file_hash_table = {
/*offset*/
header.directory_metadata_table.offset + header.directory_metadata_table.length,
/*length*/ static_cast<u32_le>(file_hash_table.size() * sizeof(u32_le))};
header.file_metadata_table = {/*offset*/ header.file_hash_table.offset +
header.file_hash_table.length,
/*length*/ static_cast<u32_le>(file_metadata_table.size())};
header.file_data_offset =
Common::AlignUp(header.file_metadata_table.offset + header.file_metadata_table.length, 16);
// Write hash table and metadata table
metadata.resize(header.file_data_offset);
std::memcpy(metadata.data(), &header, header.header_length);
std::memcpy(metadata.data() + header.directory_hash_table.offset, directory_hash_table.data(),
header.directory_hash_table.length);
std::memcpy(metadata.data() + header.directory_metadata_table.offset,
directory_metadata_table.data(), header.directory_metadata_table.length);
std::memcpy(metadata.data() + header.file_hash_table.offset, file_hash_table.data(),
header.file_hash_table.length);
std::memcpy(metadata.data() + header.file_metadata_table.offset, file_metadata_table.data(),
header.file_metadata_table.length);
}
std::size_t LayeredFS::GetSize() const {
return metadata.size() + current_data_offset;
}
std::size_t LayeredFS::ReadFile(std::size_t offset, std::size_t length, u8* buffer) {
ASSERT_MSG(offset + length <= GetSize(), "Out of bound");
std::size_t read_size = 0;
if (offset < metadata.size()) {
// First read the metadata
const auto to_read = std::min(metadata.size() - offset, length);
std::memcpy(buffer, metadata.data() + offset, to_read);
read_size += to_read;
offset = 0;
} else {
offset -= metadata.size();
}
// Read files
auto current = (--data_offset_map.upper_bound(offset));
while (read_size < length) {
const auto relative_offset = offset - current->first;
std::size_t to_read{};
if (current->second->relocation.size > relative_offset) {
to_read = std::min<std::size_t>(current->second->relocation.size - relative_offset,
length - read_size);
}
const auto alignment =
std::min<std::size_t>(Common::AlignUp(current->second->relocation.size, 16) -
relative_offset,
length - read_size) -
to_read;
// Read the file in different ways depending on relocation type
auto& relocation = current->second->relocation;
if (relocation.type == 0) { // none
romfs->ReadFile(relocation.original_offset + relative_offset, to_read,
buffer + read_size);
} else if (relocation.type == 1) { // replace
FileUtil::IOFile replace_file(relocation.replace_file_path, "rb");
if (replace_file) {
replace_file.Seek(relative_offset, SEEK_SET);
replace_file.ReadBytes(buffer + read_size, to_read);
} else {
LOG_ERROR(Service_FS, "Could not open replacement file for {}",
current->second->path);
}
} else if (relocation.type == 2) { // patch
std::memcpy(buffer + read_size, relocation.patched_file.data() + relative_offset,
to_read);
} else {
UNREACHABLE();
}
std::memset(buffer + read_size + to_read, 0, alignment);
read_size += to_read + alignment;
offset += to_read + alignment;
current++;
}
return read_size;
}
bool LayeredFS::ExtractDirectory(Directory& current, const std::string& target_path) {
if (!FileUtil::CreateFullPath(target_path + current.path)) {
LOG_ERROR(Service_FS, "Could not create path {}", target_path + current.path);
return false;
}
constexpr std::size_t BufferSize = 0x10000;
std::array<u8, BufferSize> buffer;
for (const auto& file : current.files) {
// Extract file
const auto path = target_path + file->path;
LOG_INFO(Service_FS, "Extracting {} to {}", file->path, path);
FileUtil::IOFile target_file(path, "wb");
if (!target_file) {
LOG_ERROR(Service_FS, "Could not open file {}", path);
return false;
}
std::size_t written = 0;
while (written < file->relocation.size) {
const auto to_read =
std::min<std::size_t>(buffer.size(), file->relocation.size - written);
if (romfs->ReadFile(file->relocation.original_offset + written, to_read,
buffer.data()) != to_read) {
LOG_ERROR(Service_FS, "Could not read from RomFS");
return false;
}
if (target_file.WriteBytes(buffer.data(), to_read) != to_read) {
LOG_ERROR(Service_FS, "Could not write to file {}", path);
return false;
}
written += to_read;
}
}
for (const auto& directory : current.directories) {
if (!ExtractDirectory(*directory, target_path)) {
return false;
}
}
return true;
}
bool LayeredFS::DumpRomFS(const std::string& target_path) {
std::string path = target_path;
if (path.back() == '/' || path.back() == '\\') {
path.erase(path.size() - 1, 1);
}
return ExtractDirectory(root, path);
}
} // namespace FileSys

123
src/core/file_sys/layered_fs.h Normal file
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@ -0,0 +1,123 @@
// Copyright 2020 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <map>
#include <memory>
#include <string>
#include <unordered_map>
#include <vector>
#include "common/common_types.h"
#include "common/swap.h"
#include "core/file_sys/romfs_reader.h"
namespace FileSys {
struct RomFSHeader {
struct Descriptor {
u32_le offset;
u32_le length;
};
u32_le header_length;
Descriptor directory_hash_table;
Descriptor directory_metadata_table;
Descriptor file_hash_table;
Descriptor file_metadata_table;
u32_le file_data_offset;
};
static_assert(sizeof(RomFSHeader) == 0x28, "Size of RomFSHeader is not correct");
/**
* LayeredFS implementation. This basically adds a layer to another RomFSReader.
*
* patch_path: Path for RomFS replacements. Files present in this path replace or create
* corresponding files in RomFS.
* patch_ext_path: Path for RomFS extensions. Files present in this path:
* - When with an extension of ".stub", remove the corresponding file in the RomFS.
* - When with an extension of ".ips" or ".bps", patch the file in the RomFS.
*/
class LayeredFS : public RomFSReader {
public:
explicit LayeredFS(std::shared_ptr<RomFSReader> romfs, std::string patch_path,
std::string patch_ext_path, bool load_relocations = true);
~LayeredFS() override;
std::size_t GetSize() const override;
std::size_t ReadFile(std::size_t offset, std::size_t length, u8* buffer) override;
bool DumpRomFS(const std::string& target_path);
private:
struct File;
struct Directory {
std::string name;
std::string path; // with trailing '/'
std::vector<std::unique_ptr<File>> files;
std::vector<std::unique_ptr<Directory>> directories;
Directory* parent;
};
std::string ReadName(u32 offset, u32 name_length);
// Loads the current directory, then its siblings, and then its children.
void LoadDirectory(Directory& current, u32 offset);
// Load the file at offset, and then its siblings.
void LoadFile(Directory& parent, u32 offset);
// Load replace/create relocations
void LoadRelocations();
// Load patch/remove relocations
void LoadExtRelocations();
// Calculate the offset of a single directory add it to the map and list of directories
void PrepareBuildDirectory(Directory& current);
// Calculate the offset of a single file add it to the map and list of files
void PrepareBuildFile(File& current);
// Recursively generate a sequence of files and directories and their offsets for all
// children of current. (The current directory itself is not handled.)
void PrepareBuild(Directory& current);
void BuildDirectories();
void BuildFiles();
// Recursively extract a directory and all its contents to target_path
// target_path should be without trailing '/'.
bool ExtractDirectory(Directory& current, const std::string& target_path);
void RebuildMetadata();
std::shared_ptr<RomFSReader> romfs;
std::string patch_path;
std::string patch_ext_path;
RomFSHeader header;
Directory root;
std::unordered_map<std::string, File*> file_path_map;
std::unordered_map<std::string, Directory*> directory_path_map;
std::map<u64, File*> data_offset_map; // assigned data offset -> file
std::vector<u8> metadata; // Includes header, hash table and metadata
// Used for rebuilding header
std::vector<u32_le> directory_hash_table;
std::vector<u32_le> file_hash_table;
std::unordered_map<Directory*, u32>
directory_metadata_offset_map; // directory -> metadata offset
std::vector<Directory*> directory_list; // sequence of directories to be written to metadata
u64 current_directory_offset{}; // current directory metadata offset
std::vector<u8> directory_metadata_table; // rebuilt directory metadata table
std::unordered_map<File*, u32> file_metadata_offset_map; // file -> metadata offset
std::vector<File*> file_list; // sequence of files to be written to metadata
u64 current_file_offset{}; // current file metadata offset
std::vector<u8> file_metadata_table; // rebuilt file metadata table
u64 current_data_offset{}; // current assigned data offset
};
} // namespace FileSys

109
src/core/file_sys/ncch_container.cpp
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@ -11,6 +11,7 @@
#include "common/common_types.h"
#include "common/logging/log.h"
#include "core/core.h"
#include "core/file_sys/layered_fs.h"
#include "core/file_sys/ncch_container.h"
#include "core/file_sys/patch.h"
#include "core/file_sys/seed_db.h"
@ -25,6 +26,14 @@ namespace FileSys {
static const int kMaxSections = 8; ///< Maximum number of sections (files) in an ExeFs
static const int kBlockSize = 0x200; ///< Size of ExeFS blocks (in bytes)
u64 GetModId(u64 program_id) {
constexpr u64 UPDATE_MASK = 0x0000000e'00000000;
if ((program_id & 0x000000ff'00000000) == UPDATE_MASK) { // Apply the mods to updates
return program_id & ~UPDATE_MASK;
}
return program_id;
}
/**
* Get the decompressed size of an LZSS compressed ExeFS file
* @param buffer Buffer of compressed file
@ -303,8 +312,22 @@ Loader::ResultStatus NCCHContainer::Load() {
}
}
FileUtil::IOFile exheader_override_file{filepath + ".exheader", "rb"};
const bool has_exheader_override = read_exheader(exheader_override_file);
const auto mods_path =
fmt::format("{}mods/{:016X}/", FileUtil::GetUserPath(FileUtil::UserPath::LoadDir),
GetModId(ncch_header.program_id));
std::array<std::string, 2> exheader_override_paths{{
mods_path + "exheader.bin",
filepath + ".exheader",
}};
bool has_exheader_override = false;
for (const auto& path : exheader_override_paths) {
FileUtil::IOFile exheader_override_file{path, "rb"};
if (read_exheader(exheader_override_file)) {
has_exheader_override = true;
break;
}
}
if (has_exheader_override) {
if (exheader_header.system_info.jump_id !=
exheader_header.arm11_system_local_caps.program_id) {
@ -512,7 +535,13 @@ Loader::ResultStatus NCCHContainer::ApplyCodePatch(std::vector<u8>& code) const
std::string path;
bool (*patch_fn)(const std::vector<u8>& patch, std::vector<u8>& code);
};
const std::array<PatchLocation, 2> patch_paths{{
const auto mods_path =
fmt::format("{}mods/{:016X}/", FileUtil::GetUserPath(FileUtil::UserPath::LoadDir),
GetModId(ncch_header.program_id));
const std::array<PatchLocation, 4> patch_paths{{
{mods_path + "exefs/code.ips", Patch::ApplyIpsPatch},
{mods_path + "exefs/code.bps", Patch::ApplyBpsPatch},
{filepath + ".exefsdir/code.ips", Patch::ApplyIpsPatch},
{filepath + ".exefsdir/code.bps", Patch::ApplyBpsPatch},
}};
@ -551,23 +580,33 @@ Loader::ResultStatus NCCHContainer::LoadOverrideExeFSSection(const char* name,
else
return Loader::ResultStatus::Error;
std::string section_override = filepath + ".exefsdir/" + override_name;
FileUtil::IOFile section_file(section_override, "rb");
const auto mods_path =
fmt::format("{}mods/{:016X}/", FileUtil::GetUserPath(FileUtil::UserPath::LoadDir),
GetModId(ncch_header.program_id));
std::array<std::string, 2> override_paths{{
mods_path + "exefs/" + override_name,
filepath + ".exefsdir/" + override_name,
}};
if (section_file.IsOpen()) {
auto section_size = section_file.GetSize();
buffer.resize(section_size);
for (const auto& path : override_paths) {
FileUtil::IOFile section_file(path, "rb");
section_file.Seek(0, SEEK_SET);
if (section_file.ReadBytes(&buffer[0], section_size) == section_size) {
LOG_WARNING(Service_FS, "File {} overriding built-in ExeFS file", section_override);
return Loader::ResultStatus::Success;
if (section_file.IsOpen()) {
auto section_size = section_file.GetSize();
buffer.resize(section_size);
section_file.Seek(0, SEEK_SET);
if (section_file.ReadBytes(&buffer[0], section_size) == section_size) {
LOG_WARNING(Service_FS, "File {} overriding built-in ExeFS file", path);
return Loader::ResultStatus::Success;
}
}
}
return Loader::ResultStatus::ErrorNotUsed;
}
Loader::ResultStatus NCCHContainer::ReadRomFS(std::shared_ptr<RomFSReader>& romfs_file) {
Loader::ResultStatus NCCHContainer::ReadRomFS(std::shared_ptr<RomFSReader>& romfs_file,
bool use_layered_fs) {
Loader::ResultStatus result = Load();
if (result != Loader::ResultStatus::Success)
return result;
@ -597,14 +636,43 @@ Loader::ResultStatus NCCHContainer::ReadRomFS(std::shared_ptr<RomFSReader>& romf
if (!romfs_file_inner.IsOpen())
return Loader::ResultStatus::Error;
std::shared_ptr<RomFSReader> direct_romfs;
if (is_encrypted) {
romfs_file = std::make_shared<RomFSReader>(std::move(romfs_file_inner), romfs_offset,
romfs_size, secondary_key, romfs_ctr, 0x1000);
direct_romfs =
std::make_shared<DirectRomFSReader>(std::move(romfs_file_inner), romfs_offset,
romfs_size, secondary_key, romfs_ctr, 0x1000);
} else {
romfs_file =
std::make_shared<RomFSReader>(std::move(romfs_file_inner), romfs_offset, romfs_size);
direct_romfs = std::make_shared<DirectRomFSReader>(std::move(romfs_file_inner),
romfs_offset, romfs_size);
}
const auto path =
fmt::format("{}mods/{:016X}/", FileUtil::GetUserPath(FileUtil::UserPath::LoadDir),
GetModId(ncch_header.program_id));
if (use_layered_fs &&
(FileUtil::Exists(path + "romfs/") || FileUtil::Exists(path + "romfs_ext/"))) {
romfs_file = std::make_shared<LayeredFS>(std::move(direct_romfs), path + "romfs/",
path + "romfs_ext/");
} else {
romfs_file = std::move(direct_romfs);
}
return Loader::ResultStatus::Success;
}
Loader::ResultStatus NCCHContainer::DumpRomFS(const std::string& target_path) {
std::shared_ptr<RomFSReader> direct_romfs;
Loader::ResultStatus result = ReadRomFS(direct_romfs, false);
if (result != Loader::ResultStatus::Success)
return result;
std::shared_ptr<LayeredFS> layered_fs =
std::make_shared<LayeredFS>(std::move(direct_romfs), "", "", false);
if (!layered_fs->DumpRomFS(target_path)) {
return Loader::ResultStatus::Error;
}
return Loader::ResultStatus::Success;
}
@ -614,9 +682,10 @@ Loader::ResultStatus NCCHContainer::ReadOverrideRomFS(std::shared_ptr<RomFSReade
if (FileUtil::Exists(split_filepath)) {
FileUtil::IOFile romfs_file_inner(split_filepath, "rb");
if (romfs_file_inner.IsOpen()) {
LOG_WARNING(Service_FS, "File {} overriding built-in RomFS", split_filepath);
romfs_file = std::make_shared<RomFSReader>(std::move(romfs_file_inner), 0,
romfs_file_inner.GetSize());
LOG_WARNING(Service_FS, "File {} overriding built-in RomFS; LayeredFS not enabled",
split_filepath);
romfs_file = std::make_shared<DirectRomFSReader>(std::move(romfs_file_inner), 0,
romfs_file_inner.GetSize());
return Loader::ResultStatus::Success;
}
}

10
src/core/file_sys/ncch_container.h
View File

@ -247,7 +247,15 @@ public:
* @param size The size of the romfs
* @return ResultStatus result of function
*/
Loader::ResultStatus ReadRomFS(std::shared_ptr<RomFSReader>& romfs_file);
Loader::ResultStatus ReadRomFS(std::shared_ptr<RomFSReader>& romfs_file,
bool use_layered_fs = true);
/**
* Dump the RomFS of the NCCH container to the user folder.
* @param target_path target path to dump to
* @return ResultStatus result of function.
*/
Loader::ResultStatus DumpRomFS(const std::string& target_path);
/**
* Get the override RomFS of the NCCH container

2
src/core/file_sys/romfs_reader.cpp
View File

@ -5,7 +5,7 @@
namespace FileSys {
std::size_t RomFSReader::ReadFile(std::size_t offset, std::size_t length, u8* buffer) {
std::size_t DirectRomFSReader::ReadFile(std::size_t offset, std::size_t length, u8* buffer) {
if (length == 0)
return 0; // Crypto++ does not like zero size buffer
file.Seek(file_offset + offset, SEEK_SET);

28
src/core/file_sys/romfs_reader.h
View File

@ -6,23 +6,39 @@
namespace FileSys {
/**
* Interface for reading RomFS data.
*/
class RomFSReader {
public:
RomFSReader(FileUtil::IOFile&& file, std::size_t file_offset, std::size_t data_size)
virtual ~RomFSReader() = default;
virtual std::size_t GetSize() const = 0;
virtual std::size_t ReadFile(std::size_t offset, std::size_t length, u8* buffer) = 0;
};
/**
* A RomFS reader that directly reads the RomFS file.
*/
class DirectRomFSReader : public RomFSReader {
public:
DirectRomFSReader(FileUtil::IOFile&& file, std::size_t file_offset, std::size_t data_size)
: is_encrypted(false), file(std::move(file)), file_offset(file_offset),
data_size(data_size) {}
RomFSReader(FileUtil::IOFile&& file, std::size_t file_offset, std::size_t data_size,
const std::array<u8, 16>& key, const std::array<u8, 16>& ctr,
std::size_t crypto_offset)
DirectRomFSReader(FileUtil::IOFile&& file, std::size_t file_offset, std::size_t data_size,
const std::array<u8, 16>& key, const std::array<u8, 16>& ctr,
std::size_t crypto_offset)
: is_encrypted(true), file(std::move(file)), key(key), ctr(ctr), file_offset(file_offset),
crypto_offset(crypto_offset), data_size(data_size) {}
std::size_t GetSize() const {
~DirectRomFSReader() override = default;
std::size_t GetSize() const override {
return data_size;
}
std::size_t ReadFile(std::size_t offset, std::size_t length, u8* buffer);
std::size_t ReadFile(std::size_t offset, std::size_t length, u8* buffer) override;
private:
bool is_encrypted;

4
src/core/loader/3dsx.cpp
View File

@ -309,8 +309,8 @@ ResultStatus AppLoader_THREEDSX::ReadRomFS(std::shared_ptr<FileSys::RomFSReader>
if (!romfs_file_inner.IsOpen())
return ResultStatus::Error;
romfs_file = std::make_shared<FileSys::RomFSReader>(std::move(romfs_file_inner),
romfs_offset, romfs_size);
romfs_file = std::make_shared<FileSys::DirectRomFSReader>(std::move(romfs_file_inner),
romfs_offset, romfs_size);
return ResultStatus::Success;
}

18
src/core/loader/loader.h
View File

@ -186,6 +186,15 @@ public:
return ResultStatus::ErrorNotImplemented;
}
/**
* Dump the RomFS of the applciation
* @param target_path The target path to dump to
* @return ResultStatus result of function
*/
virtual ResultStatus DumpRomFS(const std::string& target_path) {
return ResultStatus::ErrorNotImplemented;
}
/**
* Get the update RomFS of the application
* Since the RomFS can be huge, we return a file reference instead of copying to a buffer
@ -196,6 +205,15 @@ public:
return ResultStatus::ErrorNotImplemented;
}
/**
* Dump the update RomFS of the applciation
* @param target_path The target path to dump to
* @return ResultStatus result of function
*/
virtual ResultStatus DumpUpdateRomFS(const std::string& target_path) {
return ResultStatus::ErrorNotImplemented;
}
/**
* Get the title of the application
* @param title Reference to store the application title into

12
src/core/loader/ncch.cpp
View File

@ -254,6 +254,18 @@ ResultStatus AppLoader_NCCH::ReadUpdateRomFS(std::shared_ptr<FileSys::RomFSReade
return ResultStatus::Success;
}
ResultStatus AppLoader_NCCH::DumpRomFS(const std::string& target_path) {
return base_ncch.DumpRomFS(target_path);
}
ResultStatus AppLoader_NCCH::DumpUpdateRomFS(const std::string& target_path) {
u64 program_id;
ReadProgramId(program_id);
update_ncch.OpenFile(
Service::AM::GetTitleContentPath(Service::FS::MediaType::SDMC, program_id | UPDATE_MASK));
return update_ncch.DumpRomFS(target_path);
}
ResultStatus AppLoader_NCCH::ReadTitle(std::string& title) {
std::vector<u8> data;
Loader::SMDH smdh;

4
src/core/loader/ncch.h
View File

@ -59,6 +59,10 @@ public:
ResultStatus ReadUpdateRomFS(std::shared_ptr<FileSys::RomFSReader>& romfs_file) override;
ResultStatus DumpRomFS(const std::string& target_path) override;
ResultStatus DumpUpdateRomFS(const std::string& target_path) override;
ResultStatus ReadTitle(std::string& title) override;
private: