initial fs implementation (mounting /app0/)

src/core/file_sys/fs.h

@@ -0,0 +1,54 @@
+#pragma once
+#include <mutex>
+#include <string>
+#include <vector>
+
+#include "common/fs_file.h"
+
+namespace Core::FileSys {
+
+class MntPoints {
+  public:
+    struct MntPair {
+        std::string host_path;
+        std::string guest_path;  // e.g /app0/
+    };
+
+    MntPoints() = default;
+    virtual ~MntPoints() = default;
+    void mount(const std::string& host_folder, const std::string& guest_folder);
+    void unmount(const std::string& path);
+    void unmountAll();
+    std::string getHostDirectory(const std::string& guest_directory);
+    std::string MntPoints::getHostFile(const std::string& guest_file);
+
+  private:
+    std::vector<MntPair> m_mnt_pairs;
+    std::mutex m_mutex;
+};
+
+struct File {
+    std::atomic_bool isOpened;
+    std::atomic_bool isDirectory;
+    std::string m_host_name;
+    std::string m_guest_name;
+    Common::FS::File f;
+    //std::vector<Common::FS::DirEntry> dirents;
+    u32 dirents_index;
+    std::mutex m_mutex;
+};
+class HandleTable {
+  public:
+    HandleTable() {}
+    virtual ~HandleTable() {}
+    int createHandle();
+    void deleteHandle(int d);
+    File* getFile(int d);
+    File* getFile(const std::string& host_name);
+
+  private:
+    std::vector<File*> m_files;
+    std::mutex m_mutex;
+};
+
+}  // namespace Core::FileSys