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Improve path splitting speed

master
BreadFish64 2023-12-05 23:17:19 +07:00 committed by Liam
parent 167efb2d2b
commit d5de9402ee
5 changed files with 38 additions and 28 deletions
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38
src/common/fs/path_util.cpp
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@ -354,18 +354,36 @@ std::string_view RemoveTrailingSlash(std::string_view path) {
return path;
}
std::vector<std::string> SplitPathComponents(std::string_view filename) {
std::string copy(filename);
std::replace(copy.begin(), copy.end(), '\\', '/');
std::vector<std::string> out;
std::stringstream stream(copy);
std::string item;
while (std::getline(stream, item, '/')) {
out.push_back(std::move(item));
template <typename F>
static void ForEachPathComponent(std::string_view filename, F&& cb) {
const char* component_begin = filename.data();
const char* const end = component_begin + filename.size();
for (const char* it = component_begin; it != end; ++it) {
const char c = *it;
if (c == '\\' || c == '/') {
if (component_begin != it) {
cb(std::string_view{component_begin, it});
}
component_begin = it + 1;
}
}
if (component_begin != end) {
cb(std::string_view{component_begin, end});
}
}
return out;
std::vector<std::string_view> SplitPathComponents(std::string_view filename) {
std::vector<std::string_view> components;
ForEachPathComponent(filename, [&](auto component) { components.emplace_back(component); });
return components;
}
std::vector<std::string> SplitPathComponentsCopy(std::string_view filename) {
std::vector<std::string> components;
ForEachPathComponent(filename, [&](auto component) { components.emplace_back(component); });
return components;
}
std::string SanitizePath(std::string_view path_, DirectorySeparator directory_separator) {

6
src/common/fs/path_util.h
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@ -289,7 +289,11 @@ enum class DirectorySeparator {
// Splits the path on '/' or '\' and put the components into a vector
// i.e. "C:\Users\Yuzu\Documents\save.bin" becomes {"C:", "Users", "Yuzu", "Documents", "save.bin" }
[[nodiscard]] std::vector<std::string> SplitPathComponents(std::string_view filename);
[[nodiscard]] std::vector<std::string_view> SplitPathComponents(std::string_view filename);
// Splits the path on '/' or '\' and put the components into a vector
// i.e. "C:\Users\Yuzu\Documents\save.bin" becomes {"C:", "Users", "Yuzu", "Documents", "save.bin" }
[[nodiscard]] std::vector<std::string> SplitPathComponentsCopy(std::string_view filename);
// Removes trailing slash, makes all '\\' into '/', and removes duplicate '/'. Makes '/' into '\\'
// depending if directory_separator is BackwardSlash or PlatformDefault and running on windows

8
src/core/file_sys/vfs.cpp
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@ -201,8 +201,6 @@ std::string VfsFile::GetFullPath() const {
VirtualFile VfsDirectory::GetFileRelative(std::string_view path) const {
auto vec = Common::FS::SplitPathComponents(path);
vec.erase(std::remove_if(vec.begin(), vec.end(), [](const auto& str) { return str.empty(); }),
vec.end());
if (vec.empty()) {
return nullptr;
}
@ -237,8 +235,6 @@ VirtualFile VfsDirectory::GetFileAbsolute(std::string_view path) const {
VirtualDir VfsDirectory::GetDirectoryRelative(std::string_view path) const {
auto vec = Common::FS::SplitPathComponents(path);
vec.erase(std::remove_if(vec.begin(), vec.end(), [](const auto& str) { return str.empty(); }),
vec.end());
if (vec.empty()) {
// TODO(DarkLordZach): Return this directory if path is '/' or similar. Can't currently
// because of const-ness
@ -303,8 +299,6 @@ std::size_t VfsDirectory::GetSize() const {
VirtualFile VfsDirectory::CreateFileRelative(std::string_view path) {
auto vec = Common::FS::SplitPathComponents(path);
vec.erase(std::remove_if(vec.begin(), vec.end(), [](const auto& str) { return str.empty(); }),
vec.end());
if (vec.empty()) {
return nullptr;
}
@ -334,8 +328,6 @@ VirtualFile VfsDirectory::CreateFileAbsolute(std::string_view path) {
VirtualDir VfsDirectory::CreateDirectoryRelative(std::string_view path) {
auto vec = Common::FS::SplitPathComponents(path);
vec.erase(std::remove_if(vec.begin(), vec.end(), [](const auto& str) { return str.empty(); }),
vec.end());
if (vec.empty()) {
return nullptr;
}

8
src/core/file_sys/vfs_real.cpp
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@ -268,7 +268,7 @@ void RealVfsFilesystem::RemoveReferenceFromListLocked(FileReference& reference)
RealVfsFile::RealVfsFile(RealVfsFilesystem& base_, std::unique_ptr<FileReference> reference_,
const std::string& path_, Mode perms_, std::optional<u64> size_)
: base(base_), reference(std::move(reference_)), path(path_),
parent_path(FS::GetParentPath(path_)), path_components(FS::SplitPathComponents(path_)),
parent_path(FS::GetParentPath(path_)), path_components(FS::SplitPathComponentsCopy(path_)),
size(size_), perms(perms_) {}
RealVfsFile::~RealVfsFile() {
@ -276,7 +276,7 @@ RealVfsFile::~RealVfsFile() {
}
std::string RealVfsFile::GetName() const {
return path_components.back();
return path_components.empty() ? "" : std::string(path_components.back());
}
std::size_t RealVfsFile::GetSize() const {
@ -375,7 +375,7 @@ std::vector<VirtualDir> RealVfsDirectory::IterateEntries<RealVfsDirectory, VfsDi
RealVfsDirectory::RealVfsDirectory(RealVfsFilesystem& base_, const std::string& path_, Mode perms_)
: base(base_), path(FS::RemoveTrailingSlash(path_)), parent_path(FS::GetParentPath(path)),
path_components(FS::SplitPathComponents(path)), perms(perms_) {
path_components(FS::SplitPathComponentsCopy(path)), perms(perms_) {
if (!FS::Exists(path) && True(perms & Mode::Write)) {
void(FS::CreateDirs(path));
}
@ -464,7 +464,7 @@ bool RealVfsDirectory::IsReadable() const {
}
std::string RealVfsDirectory::GetName() const {
return path_components.back();
return path_components.empty() ? "" : std::string(path_components.back());
}
VirtualDir RealVfsDirectory::GetParentDirectory() const {

6
src/core/hle/service/filesystem/filesystem.cpp
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@ -104,11 +104,7 @@ Result VfsDirectoryServiceWrapper::CreateDirectory(const std::string& path_) con
const auto components = Common::FS::SplitPathComponents(path);
std::string relative_path;
for (const auto& component : components) {
// Skip empty path components
if (component.empty()) {
continue;
}
relative_path = Common::FS::SanitizePath(relative_path + '/' + component);
relative_path = Common::FS::SanitizePath(fmt::format("{}/{}", relative_path, component));
auto new_dir = backing->CreateSubdirectory(relative_path);
if (new_dir == nullptr) {
// TODO(DarkLordZach): Find a better error code for this