fs: Refactor to use cmif serialization

src/core/file_sys/fssrv/fssrv_sf_path.h

@@ -0,0 +1,36 @@
+// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "core/file_sys/fs_directory.h"
+
+namespace FileSys::Sf {
+
+struct Path {
+    char str[EntryNameLengthMax + 1];
+
+    static constexpr Path Encode(const char* p) {
+        Path path = {};
+        for (size_t i = 0; i < sizeof(path) - 1; i++) {
+            path.str[i] = p[i];
+            if (p[i] == '\x00') {
+                break;
+            }
+        }
+        return path;
+    }
+
+    static constexpr size_t GetPathLength(const Path& path) {
+        size_t len = 0;
+        for (size_t i = 0; i < sizeof(path) - 1 && path.str[i] != '\x00'; i++) {
+            len++;
+        }
+        return len;
+    }
+};
+static_assert(std::is_trivially_copyable_v<Path>, "Path must be trivially copyable.");
+
+using FspPath = Path;
+
+} // namespace FileSys::Sf