Virtual Filesystem 2: Electric Boogaloo (#676)

* Virtual Filesystem

* Fix delete bug and documentate

* Review fixes + other stuff

* Fix puyo regression

src/core/hle/service/filesystem/filesystem.h

@@ -6,15 +6,13 @@
 
 #include <memory>
 #include "common/common_types.h"
+#include "core/file_sys/directory.h"
+#include "core/file_sys/mode.h"
 #include "core/file_sys/romfs_factory.h"
 #include "core/file_sys/savedata_factory.h"
 #include "core/file_sys/sdmc_factory.h"
 #include "core/hle/result.h"
 
-namespace FileSys {
-class FileSystemBackend;
-} // namespace FileSys
-
 namespace Service {
 
 namespace SM {
@@ -29,11 +27,10 @@ ResultCode RegisterSDMC(std::unique_ptr<FileSys::SDMCFactory>&& factory);
 
 // TODO(DarkLordZach): BIS Filesystem
 // ResultCode RegisterBIS(std::unique_ptr<FileSys::BISFactory>&& factory);
-
-ResultVal<std::unique_ptr<FileSys::FileSystemBackend>> OpenRomFS(u64 title_id);
-ResultVal<std::unique_ptr<FileSys::FileSystemBackend>> OpenSaveData(
-    FileSys::SaveDataSpaceId space, FileSys::SaveDataDescriptor save_struct);
-ResultVal<std::unique_ptr<FileSys::FileSystemBackend>> OpenSDMC();
+ResultVal<FileSys::VirtualFile> OpenRomFS(u64 title_id);
+ResultVal<FileSys::VirtualDir> OpenSaveData(FileSys::SaveDataSpaceId space,
+                                            FileSys::SaveDataDescriptor save_struct);
+ResultVal<FileSys::VirtualDir> OpenSDMC();
 
 // TODO(DarkLordZach): BIS Filesystem
 // ResultVal<std::unique_ptr<FileSys::FileSystemBackend>> OpenBIS();
@@ -41,5 +38,100 @@ ResultVal<std::unique_ptr<FileSys::FileSystemBackend>> OpenSDMC();
 /// Registers all Filesystem services with the specified service manager.
 void InstallInterfaces(SM::ServiceManager& service_manager);
 
+// A class that wraps a VfsDirectory with methods that return ResultVal and ResultCode instead of
+// pointers and booleans. This makes using a VfsDirectory with switch services much easier and
+// avoids repetitive code.
+class VfsDirectoryServiceWrapper {
+public:
+    explicit VfsDirectoryServiceWrapper(FileSys::VirtualDir backing);
+
+    /**
+     * Get a descriptive name for the archive (e.g. "RomFS", "SaveData", etc.)
+     */
+    std::string GetName() const;
+
+    /**
+     * Create a file specified by its path
+     * @param path Path relative to the Archive
+     * @param size The size of the new file, filled with zeroes
+     * @return Result of the operation
+     */
+    ResultCode CreateFile(const std::string& path, u64 size) const;
+
+    /**
+     * Delete a file specified by its path
+     * @param path Path relative to the archive
+     * @return Result of the operation
+     */
+    ResultCode DeleteFile(const std::string& path) const;
+
+    /**
+     * Create a directory specified by its path
+     * @param path Path relative to the archive
+     * @return Result of the operation
+     */
+    ResultCode CreateDirectory(const std::string& path) const;
+
+    /**
+     * Delete a directory specified by its path
+     * @param path Path relative to the archive
+     * @return Result of the operation
+     */
+    ResultCode DeleteDirectory(const std::string& path) const;
+
+    /**
+     * Delete a directory specified by its path and anything under it
+     * @param path Path relative to the archive
+     * @return Result of the operation
+     */
+    ResultCode DeleteDirectoryRecursively(const std::string& path) const;
+
+    /**
+     * Rename a File specified by its path
+     * @param src_path Source path relative to the archive
+     * @param dest_path Destination path relative to the archive
+     * @return Result of the operation
+     */
+    ResultCode RenameFile(const std::string& src_path, const std::string& dest_path) const;
+
+    /**
+     * Rename a Directory specified by its path
+     * @param src_path Source path relative to the archive
+     * @param dest_path Destination path relative to the archive
+     * @return Result of the operation
+     */
+    ResultCode RenameDirectory(const std::string& src_path, const std::string& dest_path) const;
+
+    /**
+     * Open a file specified by its path, using the specified mode
+     * @param path Path relative to the archive
+     * @param mode Mode to open the file with
+     * @return Opened file, or error code
+     */
+    ResultVal<FileSys::VirtualFile> OpenFile(const std::string& path, FileSys::Mode mode) const;
+
+    /**
+     * Open a directory specified by its path
+     * @param path Path relative to the archive
+     * @return Opened directory, or error code
+     */
+    ResultVal<FileSys::VirtualDir> OpenDirectory(const std::string& path);
+
+    /**
+     * Get the free space
+     * @return The number of free bytes in the archive
+     */
+    u64 GetFreeSpaceSize() const;
+
+    /**
+     * Get the type of the specified path
+     * @return The type of the specified path or error code
+     */
+    ResultVal<FileSys::EntryType> GetEntryType(const std::string& path) const;
+
+private:
+    FileSys::VirtualDir backing;
+};
+
 } // namespace FileSystem
 } // namespace Service