vfs_real: misc optimizations

2 files changed, 36 insertions, 19 deletions

diff --git a/src/core/file_sys/vfs_real.cpp b/src/core/file_sys/vfs_real.cpp
index 7a15d8438..a8fdc8f3e 100644
--- a/src/core/file_sys/vfs_real.cpp
+++ b/src/core/file_sys/vfs_real.cpp
@@ -10,6 +10,7 @@
 #include "common/fs/fs.h"
 #include "common/fs/path_util.h"
 #include "common/logging/log.h"
+#include "core/file_sys/vfs.h"
 #include "core/file_sys/vfs_real.h"
 
 // For FileTimeStampRaw
@@ -72,7 +73,8 @@ VfsEntryType RealVfsFilesystem::GetEntryType(std::string_view path_) const {
     return VfsEntryType::File;
 }
 
-VirtualFile RealVfsFilesystem::OpenFile(std::string_view path_, Mode perms) {
+VirtualFile RealVfsFilesystem::OpenFileFromEntry(std::string_view path_, std::optional<u64> size,
+                                                 Mode perms) {
     const auto path = FS::SanitizePath(path_, FS::DirectorySeparator::PlatformDefault);
 
     if (auto it = cache.find(path); it != cache.end()) {
@@ -81,20 +83,24 @@ VirtualFile RealVfsFilesystem::OpenFile(std::string_view path_, Mode perms) {
         }
     }
 
-    if (!FS::Exists(path) || !FS::IsFile(path)) {
+    if (!size && !FS::IsFile(path)) {
         return nullptr;
     }
 
     auto reference = std::make_unique<FileReference>();
     this->InsertReferenceIntoList(*reference);
 
-    auto file =
-        std::shared_ptr<RealVfsFile>(new RealVfsFile(*this, std::move(reference), path, perms));
+    auto file = std::shared_ptr<RealVfsFile>(
+        new RealVfsFile(*this, std::move(reference), path, perms, size));
     cache[path] = file;
 
     return file;
 }
 
+VirtualFile RealVfsFilesystem::OpenFile(std::string_view path_, Mode perms) {
+    return OpenFileFromEntry(path_, {}, perms);
+}
+
 VirtualFile RealVfsFilesystem::CreateFile(std::string_view path_, Mode perms) {
     const auto path = FS::SanitizePath(path_, FS::DirectorySeparator::PlatformDefault);
     cache.erase(path);
@@ -243,10 +249,10 @@ void RealVfsFilesystem::RemoveReferenceFromList(FileReference& reference) {
 }
 
 RealVfsFile::RealVfsFile(RealVfsFilesystem& base_, std::unique_ptr<FileReference> reference_,
-                         const std::string& path_, Mode perms_)
+                         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_)),
-      perms(perms_) {}
+      size(size_), perms(perms_) {}
 
 RealVfsFile::~RealVfsFile() {
     base.DropReference(std::move(reference));
@@ -257,8 +263,10 @@ std::string RealVfsFile::GetName() const {
 }
 
 std::size_t RealVfsFile::GetSize() const {
-    base.RefreshReference(path, perms, *reference);
-    return reference->file ? reference->file->GetSize() : 0;
+    if (size) {
+        return *size;
+    }
+    return FS::GetSize(path);
 }
 
 bool RealVfsFile::Resize(std::size_t new_size) {
@@ -309,10 +317,11 @@ std::vector<VirtualFile> RealVfsDirectory::IterateEntries<RealVfsFile, VfsFile>(
 
     std::vector<VirtualFile> out;
 
-    const FS::DirEntryCallable callback = [this, &out](const std::filesystem::path& full_path) {
-        const auto full_path_string = FS::PathToUTF8String(full_path);
+    const FS::DirEntryCallable callback = [this,
+                                           &out](const std::filesystem::directory_entry& entry) {
+        const auto full_path_string = FS::PathToUTF8String(entry.path());
 
-        out.emplace_back(base.OpenFile(full_path_string, perms));
+        out.emplace_back(base.OpenFileFromEntry(full_path_string, entry.file_size(), perms));
 
         return true;
     };
@@ -330,8 +339,9 @@ std::vector<VirtualDir> RealVfsDirectory::IterateEntries<RealVfsDirectory, VfsDi
 
     std::vector<VirtualDir> out;
 
-    const FS::DirEntryCallable callback = [this, &out](const std::filesystem::path& full_path) {
-        const auto full_path_string = FS::PathToUTF8String(full_path);
+    const FS::DirEntryCallable callback = [this,
+                                           &out](const std::filesystem::directory_entry& entry) {
+        const auto full_path_string = FS::PathToUTF8String(entry.path());
 
         out.emplace_back(base.OpenDirectory(full_path_string, perms));
 
@@ -483,12 +493,10 @@ std::map<std::string, VfsEntryType, std::less<>> RealVfsDirectory::GetEntries()
 
     std::map<std::string, VfsEntryType, std::less<>> out;
 
-    const FS::DirEntryCallable callback = [&out](const std::filesystem::path& full_path) {
-        const auto filename = FS::PathToUTF8String(full_path.filename());
-
+    const FS::DirEntryCallable callback = [&out](const std::filesystem::directory_entry& entry) {
+        const auto filename = FS::PathToUTF8String(entry.path().filename());
         out.insert_or_assign(filename,
-                             FS::IsDir(full_path) ? VfsEntryType::Directory : VfsEntryType::File);
-
+                             entry.is_directory() ? VfsEntryType::Directory : VfsEntryType::File);
         return true;
     };
 
diff --git a/src/core/file_sys/vfs_real.h b/src/core/file_sys/vfs_real.h
index d8c900e33..67f4c4422 100644
--- a/src/core/file_sys/vfs_real.h
+++ b/src/core/file_sys/vfs_real.h
@@ -4,6 +4,7 @@
 #pragma once
 
 #include <map>
+#include <optional>
 #include <string_view>
 #include "common/intrusive_list.h"
 #include "core/file_sys/mode.h"
@@ -20,6 +21,8 @@ struct FileReference : public Common::IntrusiveListBaseNode<FileReference> {
 };
 
 class RealVfsFile;
+class RealVfsDirectory;
+
 class RealVfsFilesystem : public VfsFilesystem {
 public:
     RealVfsFilesystem();
@@ -56,6 +59,11 @@ private:
 private:
     void InsertReferenceIntoList(FileReference& reference);
     void RemoveReferenceFromList(FileReference& reference);
+
+private:
+    friend class RealVfsDirectory;
+    VirtualFile OpenFileFromEntry(std::string_view path, std::optional<u64> size,
+                                  Mode perms = Mode::Read);
 };
 
 // An implementation of VfsFile that represents a file on the user's computer.
@@ -78,13 +86,14 @@ public:
 
 private:
     RealVfsFile(RealVfsFilesystem& base, std::unique_ptr<FileReference> reference,
-                const std::string& path, Mode perms = Mode::Read);
+                const std::string& path, Mode perms = Mode::Read, std::optional<u64> size = {});
 
     RealVfsFilesystem& base;
     std::unique_ptr<FileReference> reference;
     std::string path;
     std::string parent_path;
     std::vector<std::string> path_components;
+    std::optional<u64> size;
     Mode perms;
 };