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romfs: cache file and directory metadata tables

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This commit is contained in:
Liam 2023-11-27 20:30:00 -05:00
parent 5fb1a83e4c
commit 4bc932261b
1 changed files with 56 additions and 29 deletions
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85
src/core/file_sys/romfs.cpp
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@ -55,44 +55,68 @@ struct FileEntry {
};
static_assert(sizeof(FileEntry) == 0x20, "FileEntry has incorrect size.");
template <typename Entry>
std::pair<Entry, std::string> GetEntry(const VirtualFile& file, std::size_t offset) {
Entry entry{};
if (file->ReadObject(&entry, offset) != sizeof(Entry))
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::string string(entry.name_length, '\0');
if (file->ReadArray(&string[0], string.size(), offset + sizeof(Entry)) != string.size())
return {};
return {entry, string};
}
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)};
}
void ProcessFile(const VirtualFile& file, std::size_t file_offset, std::size_t data_offset,
u32 this_file_offset, std::shared_ptr<VectorVfsDirectory>& parent) {
while (this_file_offset != ROMFS_ENTRY_EMPTY) {
auto entry = GetEntry<FileEntry>(file, file_offset + this_file_offset);
std::pair<DirectoryEntry, std::string> GetDirectoryEntry(const RomFSTraversalContext& ctx,
size_t directory_offset) {
return GetEntry<DirectoryEntry, &RomFSTraversalContext::directory_meta>(ctx, directory_offset);
}
parent->AddFile(std::make_shared<OffsetVfsFile>(
file, entry.first.size, entry.first.offset + data_offset, entry.second));
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 VirtualFile& file, std::size_t dir_offset, std::size_t file_offset,
std::size_t data_offset, u32 this_dir_offset,
void ProcessDirectory(const RomFSTraversalContext& ctx, u32 this_dir_offset,
std::shared_ptr<VectorVfsDirectory>& parent) {
while (this_dir_offset != ROMFS_ENTRY_EMPTY) {
auto entry = GetEntry<DirectoryEntry>(file, dir_offset + this_dir_offset);
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(file, file_offset, data_offset, entry.first.child_file, current);
ProcessFile(ctx, entry.first.child_file, current);
}
if (entry.first.child_dir != ROMFS_ENTRY_EMPTY) {
ProcessDirectory(file, dir_offset, file_offset, data_offset, entry.first.child_dir,
current);
ProcessDirectory(ctx, entry.first.child_dir, current);
}
parent->AddDirectory(current);
@ -107,22 +131,25 @@ VirtualDir ExtractRomFS(VirtualFile file) {
return root_container;
}
RomFSHeader header{};
if (file->ReadObject(&header) != sizeof(RomFSHeader)) {
return root_container;
RomFSTraversalContext ctx{};
if (file->ReadObject(&ctx.header) != sizeof(RomFSHeader)) {
return nullptr;
}
if (header.header_size != sizeof(RomFSHeader)) {
return root_container;
if (ctx.header.header_size != sizeof(RomFSHeader)) {
return nullptr;
}
const u64 file_offset = header.file_meta.offset;
const u64 dir_offset = header.directory_meta.offset;
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(file, dir_offset, file_offset, header.data_offset, 0, root_container);
ProcessDirectory(ctx, 0, root_container);
if (auto root = root_container->GetSubdirectory(""); root) {
return std::make_shared<CachedVfsDirectory>(std::move(root));
return root;
}
ASSERT(false);