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// SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include <memory>
#include "common/assert.h"
#include "common/common_types.h"
#include "common/string_util.h"
#include "common/swap.h"
#include "core/file_sys/fsmitm_romfsbuild.h"
#include "core/file_sys/romfs.h"
#include "core/file_sys/vfs.h"
#include "core/file_sys/vfs_cached.h"
#include "core/file_sys/vfs_concat.h"
#include "core/file_sys/vfs_offset.h"
#include "core/file_sys/vfs_vector.h"
namespace FileSys {
namespace {
constexpr u32 ROMFS_ENTRY_EMPTY = 0xFFFFFFFF;
struct TableLocation {
u64_le offset;
u64_le size;
};
static_assert(sizeof(TableLocation) == 0x10, "TableLocation has incorrect size.");
struct RomFSHeader {
u64_le header_size;
TableLocation directory_hash;
TableLocation directory_meta;
TableLocation file_hash;
TableLocation file_meta;
u64_le data_offset;
};
static_assert(sizeof(RomFSHeader) == 0x50, "RomFSHeader has incorrect size.");
struct DirectoryEntry {
u32_le parent;
u32_le sibling;
u32_le child_dir;
u32_le child_file;
u32_le hash;
u32_le name_length;
};
static_assert(sizeof(DirectoryEntry) == 0x18, "DirectoryEntry has incorrect size.");
struct FileEntry {
u32_le parent;
u32_le sibling;
u64_le offset;
u64_le size;
u32_le hash;
u32_le name_length;
};
static_assert(sizeof(FileEntry) == 0x20, "FileEntry has incorrect size.");
struct RomFSTraversalContext {
RomFSHeader header;
VirtualFile file;
std::vector<u8> directory_meta;
std::vector<u8> file_meta;
};
template <typename EntryType, auto Member>
std::pair<EntryType, std::string> GetEntry(const RomFSTraversalContext& ctx, size_t offset) {
const size_t entry_end = offset + sizeof(EntryType);
const std::vector<u8>& vec = ctx.*Member;
const size_t size = vec.size();
const u8* data = vec.data();
EntryType entry{};
if (entry_end > size) {
return {};
}
std::memcpy(&entry, data + offset, sizeof(EntryType));
const size_t name_length = std::min(entry_end + entry.name_length, size) - entry_end;
std::string name(reinterpret_cast<const char*>(data + entry_end), name_length);
return {entry, std::move(name)};
}
std::pair<DirectoryEntry, std::string> GetDirectoryEntry(const RomFSTraversalContext& ctx,
size_t directory_offset) {
return GetEntry<DirectoryEntry, &RomFSTraversalContext::directory_meta>(ctx, directory_offset);
}
std::pair<FileEntry, std::string> GetFileEntry(const RomFSTraversalContext& ctx,
size_t file_offset) {
return GetEntry<FileEntry, &RomFSTraversalContext::file_meta>(ctx, file_offset);
}
void ProcessFile(const RomFSTraversalContext& ctx, u32 this_file_offset,
std::shared_ptr<VectorVfsDirectory>& parent) {
while (this_file_offset != ROMFS_ENTRY_EMPTY) {
auto entry = GetFileEntry(ctx, this_file_offset);
parent->AddFile(std::make_shared<OffsetVfsFile>(ctx.file, entry.first.size,
entry.first.offset + ctx.header.data_offset,
std::move(entry.second)));
this_file_offset = entry.first.sibling;
}
}
void ProcessDirectory(const RomFSTraversalContext& ctx, u32 this_dir_offset,
std::shared_ptr<VectorVfsDirectory>& parent) {
while (this_dir_offset != ROMFS_ENTRY_EMPTY) {
auto entry = GetDirectoryEntry(ctx, this_dir_offset);
auto current = std::make_shared<VectorVfsDirectory>(
std::vector<VirtualFile>{}, std::vector<VirtualDir>{}, entry.second);
if (entry.first.child_file != ROMFS_ENTRY_EMPTY) {
ProcessFile(ctx, entry.first.child_file, current);
}
if (entry.first.child_dir != ROMFS_ENTRY_EMPTY) {
ProcessDirectory(ctx, entry.first.child_dir, current);
}
parent->AddDirectory(current);
this_dir_offset = entry.first.sibling;
}
}
} // Anonymous namespace
VirtualDir ExtractRomFS(VirtualFile file) {
auto root_container = std::make_shared<VectorVfsDirectory>();
if (!file) {
return root_container;
}
RomFSTraversalContext ctx{};
if (file->ReadObject(&ctx.header) != sizeof(RomFSHeader)) {
return nullptr;
}
if (ctx.header.header_size != sizeof(RomFSHeader)) {
return nullptr;
}
ctx.file = file;
ctx.directory_meta =
file->ReadBytes(ctx.header.directory_meta.size, ctx.header.directory_meta.offset);
ctx.file_meta = file->ReadBytes(ctx.header.file_meta.size, ctx.header.file_meta.offset);
ProcessDirectory(ctx, 0, root_container);
if (auto root = root_container->GetSubdirectory(""); root) {
return root;
}
ASSERT(false);
return nullptr;
}
VirtualFile CreateRomFS(VirtualDir dir, VirtualDir ext) {
if (dir == nullptr)
return nullptr;
RomFSBuildContext ctx{dir, ext};
return ConcatenatedVfsFile::MakeConcatenatedFile(0, dir->GetName(), ctx.Build());
}
} // namespace FileSys
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