with System;
with Interfaces;
with Interfaces.C;
with Interfaces.C.Strings;

with FS.FILO.Dev;
with FS.FILO.VFS;

use Interfaces.C;

package body FS.FILO.Ext2 is

   function Is_Mounted (State : T) return Boolean is (State.S >= Mounted);
   function Is_Open (State : T) return Boolean is (State.S = File_Opened);

   procedure Mount
     (State    : in out T;
      Part_Len : in     Partition_Length;
      Success  :    out Boolean)
   is
   begin
      Success := False;
   end Mount;

   procedure Open
     (State       : in out T;
      File_Len    :    out File_Length;
      File_Path   : in     String;
      Success     : out    Boolean)
   is
   begin
      File_Len := 0;
      Success := False;
   end Open;

   procedure Close (State : in out T) is
   begin
      State.S := Mounted;
   end Close;

   procedure Read
     (State    : in out T;
      File_Len : in     File_Length;
      File_Pos : in out File_Offset;
      Buf      :    out Buffer_Type;
      Len      :    out Natural)
   is
   begin
      Buf := (others => 0);
      Len := 0;
   end Read;

   package C is new VFS (T => T, Initial => (S => Unmounted));

   function C_Mount return int
   with
      Export,
      Convention => C,
      External_Name => "ext2fs_mount";
   function C_Mount return int
   with
      SPARK_Mode => Off
   is
   begin
      return C.C_Mount;
   end C_Mount;

   function C_Open (File_Path : Strings.chars_ptr) return int
   with
      Export,
      Convention => C,
      External_Name => "ext2fs_dir";
   function C_Open (File_Path : Strings.chars_ptr) return int
   with
      SPARK_Mode => Off
   is
   begin
      return C.C_Open (File_Path);
   end C_Open;

   function C_Read (Buf : System.Address; Len : int) return int
   with
      Export,
      Convention => C,
      External_Name => "ext2fs_read";
   function C_Read (Buf : System.Address; Len : int) return int
   with
      SPARK_Mode => Off
   is
   begin
      return C.C_Read (Buf, Len);
   end C_Read;

end FS.FILO.Ext2;