146 lines
4.6 KiB
C++
146 lines
4.6 KiB
C++
// Copyright 2018 yuzu emulator team
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <memory>
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#include "common/common_types.h"
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#include "common/swap.h"
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#include "core/file_sys/fsmitm_romfsbuild.h"
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#include "core/file_sys/romfs.h"
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#include "core/file_sys/vfs.h"
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#include "core/file_sys/vfs_concat.h"
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#include "core/file_sys/vfs_offset.h"
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#include "core/file_sys/vfs_vector.h"
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namespace FileSys {
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namespace {
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constexpr u32 ROMFS_ENTRY_EMPTY = 0xFFFFFFFF;
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struct TableLocation {
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u64_le offset;
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u64_le size;
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};
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static_assert(sizeof(TableLocation) == 0x10, "TableLocation has incorrect size.");
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struct RomFSHeader {
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u64_le header_size;
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TableLocation directory_hash;
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TableLocation directory_meta;
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TableLocation file_hash;
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TableLocation file_meta;
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u64_le data_offset;
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};
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static_assert(sizeof(RomFSHeader) == 0x50, "RomFSHeader has incorrect size.");
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struct DirectoryEntry {
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u32_le sibling;
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u32_le child_dir;
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u32_le child_file;
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u32_le hash;
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u32_le name_length;
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};
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static_assert(sizeof(DirectoryEntry) == 0x14, "DirectoryEntry has incorrect size.");
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struct FileEntry {
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u32_le parent;
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u32_le sibling;
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u64_le offset;
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u64_le size;
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u32_le hash;
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u32_le name_length;
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};
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static_assert(sizeof(FileEntry) == 0x20, "FileEntry has incorrect size.");
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template <typename Entry>
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std::pair<Entry, std::string> GetEntry(const VirtualFile& file, std::size_t offset) {
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Entry entry{};
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if (file->ReadObject(&entry, offset) != sizeof(Entry))
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return {};
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std::string string(entry.name_length, '\0');
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if (file->ReadArray(&string[0], string.size(), offset + sizeof(Entry)) != string.size())
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return {};
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return {entry, string};
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}
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void ProcessFile(VirtualFile file, std::size_t file_offset, std::size_t data_offset,
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u32 this_file_offset, std::shared_ptr<VectorVfsDirectory> parent) {
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while (true) {
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auto entry = GetEntry<FileEntry>(file, file_offset + this_file_offset);
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parent->AddFile(std::make_shared<OffsetVfsFile>(
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file, entry.first.size, entry.first.offset + data_offset, entry.second));
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if (entry.first.sibling == ROMFS_ENTRY_EMPTY)
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break;
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this_file_offset = entry.first.sibling;
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}
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}
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void ProcessDirectory(VirtualFile file, std::size_t dir_offset, std::size_t file_offset,
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std::size_t data_offset, u32 this_dir_offset,
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std::shared_ptr<VectorVfsDirectory> parent) {
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while (true) {
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auto entry = GetEntry<DirectoryEntry>(file, dir_offset + this_dir_offset);
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auto current = std::make_shared<VectorVfsDirectory>(
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std::vector<VirtualFile>{}, std::vector<VirtualDir>{}, entry.second);
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if (entry.first.child_file != ROMFS_ENTRY_EMPTY) {
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ProcessFile(file, file_offset, data_offset, entry.first.child_file, current);
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}
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if (entry.first.child_dir != ROMFS_ENTRY_EMPTY) {
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ProcessDirectory(file, dir_offset, file_offset, data_offset, entry.first.child_dir,
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current);
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}
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parent->AddDirectory(current);
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if (entry.first.sibling == ROMFS_ENTRY_EMPTY)
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break;
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this_dir_offset = entry.first.sibling;
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}
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}
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} // Anonymous namespace
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VirtualDir ExtractRomFS(VirtualFile file, RomFSExtractionType type) {
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RomFSHeader header{};
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if (file->ReadObject(&header) != sizeof(RomFSHeader))
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return nullptr;
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if (header.header_size != sizeof(RomFSHeader))
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return nullptr;
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const u64 file_offset = header.file_meta.offset;
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const u64 dir_offset = header.directory_meta.offset + 4;
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auto root =
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std::make_shared<VectorVfsDirectory>(std::vector<VirtualFile>{}, std::vector<VirtualDir>{},
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file->GetName(), file->GetContainingDirectory());
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ProcessDirectory(file, dir_offset, file_offset, header.data_offset, 0, root);
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VirtualDir out = std::move(root);
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if (type == RomFSExtractionType::SingleDiscard)
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return out->GetSubdirectories().front();
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while (out->GetSubdirectories().size() == 1 && out->GetFiles().empty()) {
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if (out->GetSubdirectories().front()->GetName() == "data" &&
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type == RomFSExtractionType::Truncated)
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break;
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out = out->GetSubdirectories().front();
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}
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return out;
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}
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VirtualFile CreateRomFS(VirtualDir dir, VirtualDir ext) {
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if (dir == nullptr)
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return nullptr;
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RomFSBuildContext ctx{dir, ext};
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return ConcatenatedVfsFile::MakeConcatenatedFile(0, ctx.Build(), dir->GetName());
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}
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} // namespace FileSys
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