src/filo-blockdev.adb

package body FILO.Blockdev is

   procedure Read
      (Buffer  : in out Buffer_Type;
       Offset  : in     Blockdev_Offset;
       Success :    out Boolean)
   is
      use Interfaces.C;

      Sector      : constant unsigned_long  := unsigned_long (Offset) / 512;
      Byte_Offset : constant unsigned_long  := unsigned_long (Offset) rem 512;
      Byte_Len    : constant unsigned_long  := unsigned_long (Buffer'Length);
      Buf         : constant System.Address := Buffer'Address;

      -- NOTE: C_devread returns 1 on success
      function To_Success (Item : Interfaces.C.int) return Boolean is
         (if Item = 1 then True else False);

   begin
      Success := To_Success (C_devread (Sector, Byte_Offset, Byte_Len, Buf));
   end Read;

end FILO.Blockdev;