vfs: Add RealVfsFilesystem implementation
This commit is contained in:
Zach Hilman
parent
3f82dad1e4
commit
2de2ec25d6
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@ -36,8 +36,164 @@ static std::string ModeFlagsToString(Mode mode) {
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return mode_str;
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}
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RealVfsFile::RealVfsFile(const std::string& path_, Mode perms_)
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: backing(path_, ModeFlagsToString(perms_).c_str()), path(path_),
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RealVfsFilesystem::RealVfsFilesystem() : VfsFilesystem(nullptr) {}
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std::string RealVfsFilesystem::GetName() const {
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return "Real";
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}
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bool RealVfsFilesystem::IsReadable() const {
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return true;
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}
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bool RealVfsFilesystem::IsWritable() const {
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return true;
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}
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VfsEntryType RealVfsFilesystem::GetEntryType(std::string_view path_) const {
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const auto path = FileUtil::SanitizePath(path_, true);
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if (!FileUtil::Exists(path))
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return VfsEntryType::None;
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if (FileUtil::IsDirectory(path))
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return VfsEntryType::Directory;
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return VfsEntryType::File;
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}
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VirtualFile RealVfsFilesystem::OpenFile(std::string_view path_, Mode perms) {
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const auto path = FileUtil::SanitizePath(path_, true);
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if (cache.find(path) != cache.end()) {
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auto weak = cache[path];
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if (!weak.expired()) {
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return std::shared_ptr<RealVfsFile>(new RealVfsFile(*this, weak.lock(), path, perms));
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}
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}
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if (!FileUtil::Exists(path) && (perms & Mode::WriteAppend) != 0)
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FileUtil::CreateEmptyFile(path);
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auto backing = std::make_shared<FileUtil::IOFile>(path, ModeFlagsToString(perms).c_str());
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cache[path] = backing;
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// Cannot use make_shared as RealVfsFile constructor is private
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return std::shared_ptr<RealVfsFile>(new RealVfsFile(*this, backing, path, perms));
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}
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VirtualFile RealVfsFilesystem::CreateFile(std::string_view path_, Mode perms) {
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const auto path = FileUtil::SanitizePath(path_, true);
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if (!FileUtil::Exists(path) && !FileUtil::CreateEmptyFile(path))
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return nullptr;
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return OpenFile(path, perms);
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}
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VirtualFile RealVfsFilesystem::CopyFile(std::string_view old_path_, std::string_view new_path_) {
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const auto old_path = FileUtil::SanitizePath(old_path_, true);
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const auto new_path = FileUtil::SanitizePath(new_path_, true);
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if (!FileUtil::Exists(old_path) || FileUtil::Exists(new_path) ||
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FileUtil::IsDirectory(old_path) || !FileUtil::Copy(old_path, new_path))
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return nullptr;
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return OpenFile(new_path, Mode::ReadWrite);
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}
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VirtualFile RealVfsFilesystem::MoveFile(std::string_view old_path_, std::string_view new_path_) {
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const auto old_path = FileUtil::SanitizePath(old_path_, true);
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const auto new_path = FileUtil::SanitizePath(new_path_, true);
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if (!FileUtil::Exists(old_path) || FileUtil::Exists(new_path) ||
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FileUtil::IsDirectory(old_path) || !FileUtil::Rename(old_path, new_path))
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return nullptr;
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if (cache.find(old_path) != cache.end()) {
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auto cached = cache[old_path];
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if (!cached.expired()) {
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auto file = cached.lock();
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file->Open(new_path, "r+b");
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cache.erase(old_path);
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cache[new_path] = file;
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}
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}
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return OpenFile(new_path, Mode::ReadWrite);
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}
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bool RealVfsFilesystem::DeleteFile(std::string_view path_) {
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const auto path = FileUtil::SanitizePath(path_, true);
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if (cache.find(path) != cache.end()) {
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if (!cache[path].expired())
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cache[path].lock()->Close();
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cache.erase(path);
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}
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return FileUtil::Delete(path);
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}
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VirtualDir RealVfsFilesystem::OpenDirectory(std::string_view path_, Mode perms) {
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const auto path = FileUtil::SanitizePath(path_, true);
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// Cannot use make_shared as RealVfsDirectory constructor is private
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return std::shared_ptr<RealVfsDirectory>(new RealVfsDirectory(*this, path, perms));
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}
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VirtualDir RealVfsFilesystem::CreateDirectory(std::string_view path_, Mode perms) {
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const auto path = FileUtil::SanitizePath(path_, true);
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if (!FileUtil::Exists(path) && !FileUtil::CreateDir(path))
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return nullptr;
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// Cannot use make_shared as RealVfsDirectory constructor is private
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return std::shared_ptr<RealVfsDirectory>(new RealVfsDirectory(*this, path, perms));
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}
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VirtualDir RealVfsFilesystem::CopyDirectory(std::string_view old_path_,
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std::string_view new_path_) {
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const auto old_path = FileUtil::SanitizePath(old_path_, true);
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const auto new_path = FileUtil::SanitizePath(new_path_, true);
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if (!FileUtil::Exists(old_path) || FileUtil::Exists(new_path) ||
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!FileUtil::IsDirectory(old_path))
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return nullptr;
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FileUtil::CopyDir(old_path, new_path);
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return OpenDirectory(new_path, Mode::ReadWrite);
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}
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VirtualDir RealVfsFilesystem::MoveDirectory(std::string_view old_path_,
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std::string_view new_path_) {
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const auto old_path = FileUtil::SanitizePath(old_path_, true);
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const auto new_path = FileUtil::SanitizePath(new_path_, true);
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if (!FileUtil::Exists(old_path) || FileUtil::Exists(new_path) ||
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FileUtil::IsDirectory(old_path) || !FileUtil::Rename(old_path, new_path))
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return nullptr;
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for (auto& kv : cache) {
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// Path in cache starts with old_path
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if (kv.first.rfind(old_path, 0) == 0) {
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const auto file_old_path = FileUtil::SanitizePath(kv.first, true);
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const auto file_new_path =
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FileUtil::SanitizePath(new_path + DIR_SEP + kv.first.substr(old_path.size()), true);
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auto cached = cache[file_old_path];
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if (!cached.expired()) {
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auto file = cached.lock();
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file->Open(file_new_path, "r+b");
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cache.erase(file_old_path);
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cache[file_new_path] = file;
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}
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}
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}
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return OpenDirectory(new_path, Mode::ReadWrite);
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}
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bool RealVfsFilesystem::DeleteDirectory(std::string_view path_) {
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const auto path = FileUtil::SanitizePath(path_, true);
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for (auto& kv : cache) {
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// Path in cache starts with old_path
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if (kv.first.rfind(path, 0) == 0) {
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if (!cache[kv.first].expired())
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cache[kv.first].lock()->Close();
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cache.erase(kv.first);
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}
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}
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return FileUtil::DeleteDirRecursively(path);
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}
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RealVfsFile::RealVfsFile(RealVfsFilesystem& base_, std::shared_ptr<FileUtil::IOFile> backing_,
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const std::string& path_, Mode perms_)
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: base(base_), backing(std::move(backing_)), path(path_),
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parent_path(FileUtil::GetParentPath(path_)),
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path_components(FileUtil::SplitPathComponents(path_)),
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parent_components(FileUtil::SliceVector(path_components, 0, path_components.size() - 1)),
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@ -48,15 +204,15 @@ std::string RealVfsFile::GetName() const {
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}
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size_t RealVfsFile::GetSize() const {
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return backing.GetSize();
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return backing->GetSize();
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}
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bool RealVfsFile::Resize(size_t new_size) {
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return backing.Resize(new_size);
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return backing->Resize(new_size);
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}
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std::shared_ptr<VfsDirectory> RealVfsFile::GetContainingDirectory() const {
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return std::make_shared<RealVfsDirectory>(parent_path, perms);
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return base.OpenDirectory(parent_path, perms);
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}
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bool RealVfsFile::IsWritable() const {
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@ -68,62 +224,118 @@ bool RealVfsFile::IsReadable() const {
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}
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size_t RealVfsFile::Read(u8* data, size_t length, size_t offset) const {
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if (!backing.Seek(offset, SEEK_SET))
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if (!backing->Seek(offset, SEEK_SET))
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return 0;
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return backing.ReadBytes(data, length);
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return backing->ReadBytes(data, length);
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}
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size_t RealVfsFile::Write(const u8* data, size_t length, size_t offset) {
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if (!backing.Seek(offset, SEEK_SET))
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if (!backing->Seek(offset, SEEK_SET))
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return 0;
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return backing.WriteBytes(data, length);
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return backing->WriteBytes(data, length);
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}
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bool RealVfsFile::Rename(std::string_view name) {
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std::string name_str(name.begin(), name.end());
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const auto out = FileUtil::Rename(GetName(), name_str);
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return base.MoveFile(path, parent_path + DIR_SEP + std::string(name)) != nullptr;
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}
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path = (parent_path + DIR_SEP).append(name);
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path_components = parent_components;
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path_components.push_back(std::move(name_str));
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backing = FileUtil::IOFile(path, ModeFlagsToString(perms).c_str());
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bool RealVfsFile::Close() {
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return backing->Close();
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}
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// TODO(DarkLordZach): MSVC would not let me combine the following two functions using 'if
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// constexpr' because there is a compile error in the branch not used.
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template <>
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std::vector<VirtualFile> RealVfsDirectory::IterateEntries<RealVfsFile, VfsFile>() const {
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if (perms == Mode::Append)
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return {};
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std::vector<VirtualFile> out;
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FileUtil::ForeachDirectoryEntry(
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nullptr, path,
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[&out, this](u64* entries_out, const std::string& directory, const std::string& filename) {
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const std::string full_path = directory + DIR_SEP + filename;
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if (!FileUtil::IsDirectory(full_path))
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out.emplace_back(base.OpenFile(full_path, perms));
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return true;
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});
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return out;
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}
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bool RealVfsFile::Close() {
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return backing.Close();
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template <>
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std::vector<VirtualDir> RealVfsDirectory::IterateEntries<RealVfsDirectory, VfsDirectory>() const {
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if (perms == Mode::Append)
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return {};
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std::vector<VirtualDir> out;
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FileUtil::ForeachDirectoryEntry(
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nullptr, path,
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[&out, this](u64* entries_out, const std::string& directory, const std::string& filename) {
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const std::string full_path = directory + DIR_SEP + filename;
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if (FileUtil::IsDirectory(full_path))
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out.emplace_back(base.OpenDirectory(full_path, perms));
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return true;
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});
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return out;
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}
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RealVfsDirectory::RealVfsDirectory(const std::string& path_, Mode perms_)
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: path(FileUtil::RemoveTrailingSlash(path_)), parent_path(FileUtil::GetParentPath(path)),
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RealVfsDirectory::RealVfsDirectory(RealVfsFilesystem& base_, const std::string& path_, Mode perms_)
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: base(base_), path(FileUtil::RemoveTrailingSlash(path_)),
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parent_path(FileUtil::GetParentPath(path)),
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path_components(FileUtil::SplitPathComponents(path)),
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parent_components(FileUtil::SliceVector(path_components, 0, path_components.size() - 1)),
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perms(perms_) {
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if (!FileUtil::Exists(path) && perms & Mode::WriteAppend)
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FileUtil::CreateDir(path);
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}
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if (perms == Mode::Append)
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return;
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std::shared_ptr<VfsFile> RealVfsDirectory::GetFileRelative(std::string_view path) const {
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const auto full_path = FileUtil::SanitizePath(this->path + DIR_SEP + std::string(path));
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if (!FileUtil::Exists(full_path))
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return nullptr;
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return base.OpenFile(full_path, perms);
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}
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FileUtil::ForeachDirectoryEntry(
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nullptr, path,
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[this](u64* entries_out, const std::string& directory, const std::string& filename) {
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std::string full_path = directory + DIR_SEP + filename;
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if (FileUtil::IsDirectory(full_path))
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subdirectories.emplace_back(std::make_shared<RealVfsDirectory>(full_path, perms));
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else
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files.emplace_back(std::make_shared<RealVfsFile>(full_path, perms));
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return true;
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});
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std::shared_ptr<VfsDirectory> RealVfsDirectory::GetDirectoryRelative(std::string_view path) const {
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const auto full_path = FileUtil::SanitizePath(this->path + DIR_SEP + std::string(path));
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if (!FileUtil::Exists(full_path))
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return nullptr;
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return base.OpenDirectory(full_path, perms);
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}
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std::shared_ptr<VfsFile> RealVfsDirectory::GetFile(std::string_view name) const {
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return GetFileRelative(name);
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}
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std::shared_ptr<VfsDirectory> RealVfsDirectory::GetSubdirectory(std::string_view name) const {
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return GetDirectoryRelative(name);
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}
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std::shared_ptr<VfsFile> RealVfsDirectory::CreateFileRelative(std::string_view path) {
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const auto full_path = FileUtil::SanitizePath(this->path + DIR_SEP + std::string(path));
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return base.CreateFile(full_path, perms);
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}
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std::shared_ptr<VfsDirectory> RealVfsDirectory::CreateDirectoryRelative(std::string_view path) {
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const auto full_path = FileUtil::SanitizePath(this->path + DIR_SEP + std::string(path));
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auto parent = std::string(FileUtil::GetParentPath(full_path));
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return base.CreateDirectory(full_path, perms);
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}
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bool RealVfsDirectory::DeleteSubdirectoryRecursive(std::string_view name) {
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auto full_path = FileUtil::SanitizePath(this->path + DIR_SEP + std::string(name));
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return base.DeleteDirectory(full_path);
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}
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std::vector<std::shared_ptr<VfsFile>> RealVfsDirectory::GetFiles() const {
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return files;
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return IterateEntries<RealVfsFile, VfsFile>();
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}
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std::vector<std::shared_ptr<VfsDirectory>> RealVfsDirectory::GetSubdirectories() const {
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return subdirectories;
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return IterateEntries<RealVfsDirectory, VfsDirectory>();
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}
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bool RealVfsDirectory::IsWritable() const {
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@ -142,57 +354,32 @@ std::shared_ptr<VfsDirectory> RealVfsDirectory::GetParentDirectory() const {
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if (path_components.size() <= 1)
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return nullptr;
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return std::make_shared<RealVfsDirectory>(parent_path, perms);
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return base.OpenDirectory(parent_path, perms);
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}
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std::shared_ptr<VfsDirectory> RealVfsDirectory::CreateSubdirectory(std::string_view name) {
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const std::string subdir_path = (path + DIR_SEP).append(name);
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if (!FileUtil::CreateDir(subdir_path)) {
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return nullptr;
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}
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subdirectories.emplace_back(std::make_shared<RealVfsDirectory>(subdir_path, perms));
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return subdirectories.back();
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return base.CreateDirectory(subdir_path, perms);
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}
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std::shared_ptr<VfsFile> RealVfsDirectory::CreateFile(std::string_view name) {
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const std::string file_path = (path + DIR_SEP).append(name);
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if (!FileUtil::CreateEmptyFile(file_path)) {
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return nullptr;
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}
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files.emplace_back(std::make_shared<RealVfsFile>(file_path, perms));
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return files.back();
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return base.CreateFile(file_path, perms);
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}
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bool RealVfsDirectory::DeleteSubdirectory(std::string_view name) {
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const std::string subdir_path = (path + DIR_SEP).append(name);
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return FileUtil::DeleteDirRecursively(subdir_path);
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return base.DeleteDirectory(subdir_path);
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}
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bool RealVfsDirectory::DeleteFile(std::string_view name) {
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const auto file = GetFile(name);
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if (file == nullptr) {
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return false;
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}
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files.erase(std::find(files.begin(), files.end(), file));
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auto real_file = std::static_pointer_cast<RealVfsFile>(file);
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real_file->Close();
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const std::string file_path = (path + DIR_SEP).append(name);
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return FileUtil::Delete(file_path);
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return base.DeleteFile(file_path);
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}
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bool RealVfsDirectory::Rename(std::string_view name) {
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const std::string new_name = (parent_path + DIR_SEP).append(name);
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return FileUtil::Rename(path, new_name);
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return base.MoveFile(path, new_name) != nullptr;
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}
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std::string RealVfsDirectory::GetFullPath() const {
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@ -202,16 +389,6 @@ std::string RealVfsDirectory::GetFullPath() const {
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}
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bool RealVfsDirectory::ReplaceFileWithSubdirectory(VirtualFile file, VirtualDir dir) {
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const auto iter = std::find(files.begin(), files.end(), file);
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if (iter == files.end())
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return false;
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const std::ptrdiff_t offset = std::distance(files.begin(), iter);
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files[offset] = files.back();
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files.pop_back();
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subdirectories.emplace_back(std::move(dir));
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return true;
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}
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} // namespace FileSys
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@ -6,18 +6,45 @@
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#include <string_view>
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#include <boost/container/flat_map.hpp>
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#include "common/file_util.h"
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#include "core/file_sys/mode.h"
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#include "core/file_sys/vfs.h"
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namespace FileSys {
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class RealVfsFilesystem : public VfsFilesystem {
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public:
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RealVfsFilesystem();
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std::string GetName() const override;
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bool IsReadable() const override;
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bool IsWritable() const override;
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VfsEntryType GetEntryType(std::string_view path) const override;
|
||||
VirtualFile OpenFile(std::string_view path, Mode perms = Mode::Read) override;
|
||||
VirtualFile CreateFile(std::string_view path, Mode perms = Mode::ReadWrite) override;
|
||||
VirtualFile CopyFile(std::string_view old_path, std::string_view new_path) override;
|
||||
VirtualFile MoveFile(std::string_view old_path, std::string_view new_path) override;
|
||||
bool DeleteFile(std::string_view path) override;
|
||||
VirtualDir OpenDirectory(std::string_view path, Mode perms = Mode::Read) override;
|
||||
VirtualDir CreateDirectory(std::string_view path, Mode perms = Mode::ReadWrite) override;
|
||||
VirtualDir CopyDirectory(std::string_view old_path, std::string_view new_path) override;
|
||||
VirtualDir MoveDirectory(std::string_view old_path, std::string_view new_path) override;
|
||||
bool DeleteDirectory(std::string_view path) override;
|
||||
|
||||
private:
|
||||
boost::container::flat_map<std::string, std::weak_ptr<FileUtil::IOFile>> cache;
|
||||
};
|
||||
|
||||
// An implmentation of VfsFile that represents a file on the user's computer.
|
||||
struct RealVfsFile : public VfsFile {
|
||||
friend struct RealVfsDirectory;
|
||||
class RealVfsFile : public VfsFile {
|
||||
friend class RealVfsDirectory;
|
||||
friend class RealVfsFilesystem;
|
||||
|
||||
RealVfsFile(const std::string& name, Mode perms = Mode::Read);
|
||||
RealVfsFile(RealVfsFilesystem& base, std::shared_ptr<FileUtil::IOFile> backing,
|
||||
const std::string& path, Mode perms = Mode::Read);
|
||||
|
||||
public:
|
||||
std::string GetName() const override;
|
||||
size_t GetSize() const override;
|
||||
bool Resize(size_t new_size) override;
|
||||
|
|
@ -31,7 +58,8 @@ struct RealVfsFile : public VfsFile {
|
|||
private:
|
||||
bool Close();
|
||||
|
||||
FileUtil::IOFile backing;
|
||||
RealVfsFilesystem& base;
|
||||
std::shared_ptr<FileUtil::IOFile> backing;
|
||||
std::string path;
|
||||
std::string parent_path;
|
||||
std::vector<std::string> path_components;
|
||||
|
|
@ -40,9 +68,12 @@ private:
|
|||
};
|
||||
|
||||
// An implementation of VfsDirectory that represents a directory on the user's computer.
|
||||
struct RealVfsDirectory : public VfsDirectory {
|
||||
RealVfsDirectory(const std::string& path, Mode perms = Mode::Read);
|
||||
class RealVfsDirectory : public VfsDirectory {
|
||||
friend class RealVfsFilesystem;
|
||||
|
||||
RealVfsDirectory(RealVfsFilesystem& base, const std::string& path, Mode perms = Mode::Read);
|
||||
|
||||
public:
|
||||
std::vector<std::shared_ptr<VfsFile>> GetFiles() const override;
|
||||
std::vector<std::shared_ptr<VfsDirectory>> GetSubdirectories() const override;
|
||||
bool IsWritable() const override;
|
||||
|
|
@ -60,6 +91,7 @@ protected:
|
|||
bool ReplaceFileWithSubdirectory(VirtualFile file, VirtualDir dir) override;
|
||||
|
||||
private:
|
||||
RealVfsFilesystem& base;
|
||||
std::string path;
|
||||
std::string parent_path;
|
||||
std::vector<std::string> path_components;
|
||||
|
|
|
|||
Reference in New Issue