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core: Add dump RomFS support 

This is added to LayeredFS, then the NCCH container and then the loader interface.
This commit is contained in:
zhupengfei 2020-02-09 20:59:31 +08:00
parent db18f6c79a
commit 13e2d534e9
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GPG Key ID: DD129E108BD09378
7 changed files with 131 additions and 7 deletions
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60
src/core/file_sys/layered_fs.cpp
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@ -52,7 +52,7 @@ struct FileMetadata {
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_)
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_)) {
@ -64,8 +64,10 @@ LayeredFS::LayeredFS(std::shared_ptr<RomFSReader> romfs_, std::string patch_path
root.parent = &root;
LoadDirectory(root, 0);
if (load_relocations) {
LoadRelocations();
LoadExtRelocations();
}
RebuildMetadata();
}
@ -541,4 +543,60 @@ std::size_t LayeredFS::ReadFile(std::size_t offset, std::size_t length, u8* buff
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

8
src/core/file_sys/layered_fs.h
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@ -41,12 +41,14 @@ static_assert(sizeof(RomFSHeader) == 0x28, "Size of RomFSHeader is not correct")
class LayeredFS : public RomFSReader {
public:
explicit LayeredFS(std::shared_ptr<RomFSReader> romfs, std::string patch_path,
std::string patch_ext_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 {
@ -84,6 +86,10 @@ private:
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;

22
src/core/file_sys/ncch_container.cpp
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@ -597,7 +597,8 @@ Loader::ResultStatus NCCHContainer::LoadOverrideExeFSSection(const char* name,
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;
@ -640,7 +641,9 @@ Loader::ResultStatus NCCHContainer::ReadRomFS(std::shared_ptr<RomFSReader>& romf
const auto path =
fmt::format("{}mods/{:016X}/", FileUtil::GetUserPath(FileUtil::UserPath::LoadDir),
ncch_header.program_id & 0x00040000'FFFFFFFF);
if (FileUtil::Exists(path + "romfs/") || FileUtil::Exists(path + "romfs_ext/")) {
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 {
@ -650,6 +653,21 @@ Loader::ResultStatus NCCHContainer::ReadRomFS(std::shared_ptr<RomFSReader>& romf
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;
}
Loader::ResultStatus NCCHContainer::ReadOverrideRomFS(std::shared_ptr<RomFSReader>& romfs_file) {
// Check for RomFS overrides
std::string split_filepath = filepath + ".romfs";

10
src/core/file_sys/ncch_container.h
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@ -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

18
src/core/loader/loader.h
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@ -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
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@ -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
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@ -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: