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/**
* @file
*
* @brief RTEMS File System Data
*
* @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.
*/
/*
* 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.org/license/LICENSE.
*/
#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))
/**
* Helper function to get the data shifted in the correctly sized type.
*/
#define rtems_rfs_data_get(_d, _t, _o, _s) \
(((_t)(rtems_rfs_data_ptr (_d)[_o])) << (_s))
/**
* 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_get (_d, uint16_t, 0, 8) | \
rtems_rfs_data_get (_d, uint16_t, 1, 0))
/**
* RFS Read Unsigned 32bit Integer
*/
#define rtems_rfs_read_u32(_d) \
(rtems_rfs_data_get (_d, uint32_t, 0, 24) | \
rtems_rfs_data_get (_d, uint32_t, 1, 16) | \
rtems_rfs_data_get (_d, uint32_t, 2, 8) | \
rtems_rfs_data_get (_d, uint32_t, 3, 0))
/**
* 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)(((uint16_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)(((uint32_t)(_v)) >> 24); \
rtems_rfs_data_ptr (_d)[1] = (uint8_t)(((uint32_t)(_v)) >> 16); \
rtems_rfs_data_ptr (_d)[2] = (uint8_t)(((uint32_t)(_v)) >> 8); \
rtems_rfs_data_ptr (_d)[3] = (uint8_t)((uint32_t)(_v)); \
} while (0)
#endif
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