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patch_manager: Add PatchNSO function

While PatchExeFS operated on the entire directory, this function operates on the uncompressed NSO. Avoids copying decompression code to PatchManager.
This commit is contained in:
Zach Hilman 2018-09-29 22:15:16 -04:00
parent 4c2a94fa94
commit 42fb4e82d3
3 changed files with 104 additions and 0 deletions

View file

@ -34,6 +34,8 @@ add_library(core STATIC
file_sys/errors.h
file_sys/fsmitm_romfsbuild.cpp
file_sys/fsmitm_romfsbuild.h
file_sys/ips_layer.cpp
file_sys/ips_layer.h
file_sys/mode.h
file_sys/nca_metadata.cpp
file_sys/nca_metadata.h

View file

@ -6,13 +6,16 @@
#include <array>
#include <cstddef>
#include "common/hex_util.h"
#include "common/logging/log.h"
#include "core/file_sys/content_archive.h"
#include "core/file_sys/control_metadata.h"
#include "core/file_sys/ips_layer.h"
#include "core/file_sys/patch_manager.h"
#include "core/file_sys/registered_cache.h"
#include "core/file_sys/romfs.h"
#include "core/file_sys/vfs_layered.h"
#include "core/file_sys/vfs_vector.h"
#include "core/hle/service/filesystem/filesystem.h"
#include "core/loader/loader.h"
@ -21,6 +24,14 @@ namespace FileSys {
constexpr u64 SINGLE_BYTE_MODULUS = 0x100;
constexpr u64 DLC_BASE_TITLE_ID_MASK = 0xFFFFFFFFFFFFE000;
struct NSOBuildHeader {
u32_le magic;
INSERT_PADDING_BYTES(0x3C);
std::array<u8, 0x20> build_id;
INSERT_PADDING_BYTES(0xA0);
};
static_assert(sizeof(NSOBuildHeader) == 0x100, "NSOBuildHeader has incorrect size.");
std::string FormatTitleVersion(u32 version, TitleVersionFormat format) {
std::array<u8, sizeof(u32)> bytes{};
bytes[0] = version % SINGLE_BYTE_MODULUS;
@ -61,6 +72,89 @@ VirtualDir PatchManager::PatchExeFS(VirtualDir exefs) const {
return exefs;
}
std::vector<u8> PatchManager::PatchNSO(const std::vector<u8>& nso) const {
if (nso.size() < 0x100)
return nso;
NSOBuildHeader header{};
std::memcpy(&header, nso.data(), sizeof(NSOBuildHeader));
if (header.magic != Common::MakeMagic('N', 'S', 'O', '0'))
return nso;
const auto build_id_raw = Common::HexArrayToString(header.build_id);
const auto build_id = build_id_raw.substr(0, build_id_raw.find_last_not_of('0') + 1);
LOG_INFO(Loader, "Patching NSO for build_id={}", build_id);
const auto load_dir = Service::FileSystem::GetModificationLoadRoot(title_id);
auto patch_dirs = load_dir->GetSubdirectories();
std::sort(patch_dirs.begin(), patch_dirs.end(),
[](const VirtualDir& l, const VirtualDir& r) { return l->GetName() < r->GetName(); });
std::vector<VirtualFile> ips;
ips.reserve(patch_dirs.size() - 1);
for (const auto& subdir : patch_dirs) {
auto exefs_dir = subdir->GetSubdirectory("exefs");
if (exefs_dir != nullptr) {
for (const auto& file : exefs_dir->GetFiles()) {
if (file->GetExtension() != "ips")
continue;
auto name = file->GetName();
const auto p1 = name.substr(0, name.find_first_of('.'));
const auto this_build_id = p1.substr(0, p1.find_last_not_of('0') + 1);
if (build_id == this_build_id)
ips.push_back(file);
}
}
}
auto out = nso;
for (const auto& ips_file : ips) {
LOG_INFO(Loader, " - Appling IPS patch from mod \"{}\"",
ips_file->GetContainingDirectory()->GetParentDirectory()->GetName());
const auto patched = PatchIPS(std::make_shared<VectorVfsFile>(out), ips_file);
if (patched != nullptr)
out = patched->ReadAllBytes();
}
if (out.size() < 0x100)
return nso;
std::memcpy(out.data(), &header, sizeof(NSOBuildHeader));
return out;
}
bool PatchManager::HasNSOPatch(const std::array<u8, 32>& build_id_) const {
const auto build_id_raw = Common::HexArrayToString(build_id_);
const auto build_id = build_id_raw.substr(0, build_id_raw.find_last_not_of('0') + 1);
LOG_INFO(Loader, "Querying NSO patch existence for build_id={}", build_id);
const auto load_dir = Service::FileSystem::GetModificationLoadRoot(title_id);
auto patch_dirs = load_dir->GetSubdirectories();
std::sort(patch_dirs.begin(), patch_dirs.end(),
[](const VirtualDir& l, const VirtualDir& r) { return l->GetName() < r->GetName(); });
for (const auto& subdir : patch_dirs) {
auto exefs_dir = subdir->GetSubdirectory("exefs");
if (exefs_dir != nullptr) {
for (const auto& file : exefs_dir->GetFiles()) {
if (file->GetExtension() != "ips")
continue;
auto name = file->GetName();
const auto p1 = name.substr(0, name.find_first_of('.'));
const auto this_build_id = p1.substr(0, p1.find_last_not_of('0') + 1);
if (build_id == this_build_id)
return true;
}
}
}
return false;
}
static void ApplyLayeredFS(VirtualFile& romfs, u64 title_id, ContentRecordType type) {
const auto load_dir = Service::FileSystem::GetModificationLoadRoot(title_id);
if (type != ContentRecordType::Program || load_dir == nullptr || load_dir->GetSize() <= 0) {

View file

@ -34,6 +34,14 @@ public:
// - Game Updates
VirtualDir PatchExeFS(VirtualDir exefs) const;
// Currently tracked NSO patches:
// - IPS
std::vector<u8> PatchNSO(const std::vector<u8>& nso) const;
// Checks to see if PatchNSO() will have any effect given the NSO's build ID.
// Used to prevent expensive copies in NSO loader.
bool HasNSOPatch(const std::array<u8, 0x20>& build_id) const;
// Currently tracked RomFS patches:
// - Game Updates
// - LayeredFS