romfs: use vfs_cached for romfs output

src/core/file_sys/romfs.cpp

@@ -9,6 +9,7 @@
 #include "core/file_sys/fsmitm_romfsbuild.h"
 #include "core/file_sys/romfs.h"
 #include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs_cached.h"
 #include "core/file_sys/vfs_concat.h"
 #include "core/file_sys/vfs_offset.h"
 #include "core/file_sys/vfs_vector.h"
@@ -132,7 +133,7 @@ VirtualDir ExtractRomFS(VirtualFile file, RomFSExtractionType type) {
         out = out->GetSubdirectories().front();
     }
 
-    return out;
+    return std::make_shared<CachedVfsDirectory>(out);
 }
 
 VirtualFile CreateRomFS(VirtualDir dir, VirtualDir ext) {

src/core/file_sys/vfs_vector.cpp

@@ -67,23 +67,6 @@ VectorVfsDirectory::VectorVfsDirectory(std::vector<VirtualFile> files_,
 
 VectorVfsDirectory::~VectorVfsDirectory() = default;
 
-VirtualFile VectorVfsDirectory::GetFile(std::string_view file_name) const {
-    if (!optimized_file_index_built) {
-        optimized_file_index.clear();
-        for (size_t i = 0; i < files.size(); i++) {
-            optimized_file_index.emplace(files[i]->GetName(), i);
-        }
-        optimized_file_index_built = true;
-    }
-
-    const auto it = optimized_file_index.find(file_name);
-    if (it != optimized_file_index.end()) {
-        return files[it->second];
-    }
-
-    return nullptr;
-}
-
 std::vector<VirtualFile> VectorVfsDirectory::GetFiles() const {
     return files;
 }
@@ -124,7 +107,6 @@ bool VectorVfsDirectory::DeleteSubdirectory(std::string_view subdir_name) {
 }
 
 bool VectorVfsDirectory::DeleteFile(std::string_view file_name) {
-    optimized_file_index_built = false;
     return FindAndRemoveVectorElement(files, file_name);
 }
 
@@ -142,7 +124,6 @@ VirtualFile VectorVfsDirectory::CreateFile(std::string_view file_name) {
 }
 
 void VectorVfsDirectory::AddFile(VirtualFile file) {
-    optimized_file_index_built = false;
     files.push_back(std::move(file));
 }
 

src/core/file_sys/vfs_vector.h

@@ -105,7 +105,6 @@ public:
                                 VirtualDir parent = nullptr);
     ~VectorVfsDirectory() override;
 
-    VirtualFile GetFile(std::string_view file_name) const override;
     std::vector<VirtualFile> GetFiles() const override;
     std::vector<VirtualDir> GetSubdirectories() const override;
     bool IsWritable() const override;
@@ -127,9 +126,6 @@ private:
 
     VirtualDir parent;
     std::string name;
-
-    mutable std::map<std::string, size_t, std::less<>> optimized_file_index;
-    mutable bool optimized_file_index_built{};
 };
 
 } // namespace FileSys