/*
 *  COPYRIGHT (c) 2010 Chris Johns <chrisj@rtems.org>
 *
 *  The license and distribution terms for this file may be
 *  found in the file LICENSE in this distribution or at
 *  http://www.rtems.com/license/LICENSE.
 *
 *  $Id$
 */
/**
 * @file
 *
 * @ingroup rtems-rfs
 *
 * RTEMS File System Data.
 *
 * Access data in the correct byte order for the specific target we are running
 * on.
 *
 * @todo Make direct access on matching byte ordered targets.
 */

#if !defined (_RTEMS_RFS_DATA_H_)
#define _RTEMS_RFS_DATA_H_

#include <stdint.h>

/**
 * Helper function to make sure we have a byte pointer.
 */
#define rtems_rfs_data_ptr(_d) ((uint8_t*)(_d))

/**
 * RFS Read Unsigned 8bit Integer
 */
#define rtems_rfs_read_u8(_d) \
  (*rtems_rfs_data_ptr (_d))

/**
 * RFS Read Unsigned 16bit Integer
 */
#define rtems_rfs_read_u16(_d) \
  ((rtems_rfs_data_ptr (_d)[0] << 8) | (rtems_rfs_data_ptr (_d)[1]))

/**
 * RFS Read Unsigned 32bit Integer
 */
#define rtems_rfs_read_u32(_d) \
  ((rtems_rfs_data_ptr (_d)[0] << 24) | (rtems_rfs_data_ptr (_d)[1] << 16) | \
   (rtems_rfs_data_ptr (_d)[2] << 8) | (rtems_rfs_data_ptr (_d)[3]))

/**
 * RFS Write Unsigned 8bit Integer
 */
#define rtems_rfs_write_u8(_d, _v) \
  (*rtems_rfs_data_ptr (_d) = (uint8_t)(_v))

/**
 * RFS Write Unsigned 16bit Integer
 */
#define rtems_rfs_write_u16(_d, _v) \
  do { \
    rtems_rfs_data_ptr (_d)[0] = (uint8_t)((_v) >> 8); \
    rtems_rfs_data_ptr (_d)[1] = (uint8_t)((_v)); \
  } while (0)

/**
 * RFS Write Unsigned 32bit Integer
 */
#define rtems_rfs_write_u32(_d, _v) \
  do { \
    rtems_rfs_data_ptr (_d)[0] = (uint8_t)((_v) >> 24); \
    rtems_rfs_data_ptr (_d)[1] = (uint8_t)((_v) >> 16); \
    rtems_rfs_data_ptr (_d)[2] = (uint8_t)((_v) >> 8); \
    rtems_rfs_data_ptr (_d)[3] = (uint8_t)((_v)); \
  } while (0)

#endif