draft redesign of new fs

CMakeLists.txt

@@ -229,6 +229,9 @@ set(FILE_FORMAT src/core/file_format/pfs.h
                 src/core/file_format/psf.h
 )
 
+set(FILESYSTEM src/core/file_sys/file_system.cpp
+               src/core/file_sys/file_system.h)
+
 set(UTILITIES   src/Util/config.cpp
                 src/Util/config.h
 )
@@ -240,6 +243,7 @@ qt_add_executable(shadps4
     ${CORE}
     ${CRYPTO}
     ${FILE_FORMAT}
+    ${FILESYSTEM}
     ${UTILITIES}
 )
 else()
@@ -308,6 +312,7 @@ add_executable(shadps4
     ${CORE}
     ${CRYPTO}
     ${FILE_FORMAT}
+    ${FILESYSTEM}
     ${UTILITIES}
 )
 endif()

src/core/file_sys/file_system.h

@@ -0,0 +1,35 @@
+// SPDX-FileCopyrightText: Copyright 2024 shadPS4 Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <cstdint>
+#include <cstring>
+#include <string>
+#include <vector>
+
+#include "common/types.h"
+
+enum FileAccess {
+    FILEACCESS_NONE = 0,
+    FILEACCESS_READ = 1,
+    FILEACCESS_WRITE = 2,
+};
+
+enum FileMove { FILEMOVE_BEGIN = 0, FILEMOVE_CURRENT = 1, FILEMOVE_END = 2 };
+
+class IFileSystem {
+public:
+    virtual ~IFileSystem() {}
+
+    virtual int OpenFile(std::string filename, FileAccess access) = 0;
+    virtual void CloseFile(u32 handle) = 0;
+    virtual size_t ReadFile(u32 handle, u8* pointer, s64 size) = 0;
+    virtual size_t WriteFile(u32 handle, const u8* pointer, s64 size) = 0;
+    virtual size_t SeekFile(u32 handle, s32 position, FileMove type) = 0;
+    virtual bool OwnsHandle(u32 handle) = 0;
+    virtual bool MkDir(const std::string& dirname) = 0;
+    virtual bool RmDir(const std::string& dirname) = 0;
+    virtual int RenameFile(const std::string& from, const std::string& to) = 0;
+    virtual bool RemoveFile(const std::string& filename) = 0;
+};