rtems-rfs-block-pos.h

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/*
 *  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_BLOCK_POS_H_)
#define _RTEMS_RFS_BLOCK_POS_H_
 
#include <rtems/rfs/rtems-rfs-file-system.h>
#include <rtems/rfs/rtems-rfs-inode.h>
 
typedef rtems_rfs_inode_block rtems_rfs_block_no;
 
typedef uint32_t rtems_rfs_block_off;
 
typedef struct rtems_rfs_block_pos_s
{
  rtems_rfs_block_no bno;
 
  rtems_rfs_block_off boff;
 
  rtems_rfs_block_no block;
 
} rtems_rfs_block_pos;
 
#define rtems_rfs_block_copy_bpos(_lhs, _rhs) \
  do { (_lhs)->bno = (_rhs)->bno; \
       (_lhs)->boff = (_rhs)->boff; \
       (_lhs)->block = (_rhs)->block; } while (0)
 
static inline void
rtems_rfs_block_set_bpos_zero (rtems_rfs_block_pos* bpos)
{
  bpos->bno = 0;
  bpos->boff = 0;
  bpos->block = 0;
}
 
void rtems_rfs_block_get_bpos (rtems_rfs_file_system*  fs,
                               rtems_rfs_pos           pos,
                               rtems_rfs_block_pos*    bpos);
 
rtems_rfs_pos rtems_rfs_block_get_pos (rtems_rfs_file_system* fs,
                                       rtems_rfs_block_pos*   bpos);
 
static inline void
rtems_rfs_block_add_pos (rtems_rfs_file_system*  fs,
                         rtems_rfs_pos_rel       offset,
                         rtems_rfs_block_pos*    bpos)
{
  rtems_rfs_block_get_bpos (fs,
                            rtems_rfs_block_get_pos (fs, bpos) + offset,
                            bpos);
  bpos->block = 0;
}
 
typedef struct rtems_rfs_block_size_s
{
  rtems_rfs_block_no count;
 
  rtems_rfs_block_off offset;
 
} rtems_rfs_block_size;
 
#define rtems_rfs_block_copy_size(_lhs, _rhs) \
  do { (_lhs)->count = (_rhs)->count; \
       (_lhs)->offset = (_rhs)->offset; } while (0)
 
#define rtems_rfs_block_pos_last_block(_p, _s) \
  ((((_p)->bno == 0) && ((_s)->count == 0)) || ((_p)->bno == ((_s)->count - 1)))
 
#define rtems_rfs_block_pos_past_end(_p, _s) \
  (((_p)->bno && ((_s)->count == 0)) || \
   ((_p)->bno >= (_s)->count) || \
   (((_p)->bno == ((_s)->count - 1)) && ((_p)->boff > (_s)->offset)))
 
#define rtems_rfs_block_pos_block_past_end(_p, _s) \
  (((_p)->bno && ((_s)->count == 0)) || ((_p)->bno >= (_s)->count))
 
#define rtems_rfs_block_size_get_bpos(_s, _b) \
  do { (_b)->bno = (_s)->count; \
       (_b)->boff = (_s)->offset; \
       (_b)->block = 0; \
       if ((_b)->boff) --(_b)->bno; } while (0)
 
#define rtems_rfs_block_size_equal(_lhs, _rhs) \
  (((_lhs)->count == (_rhs)->count) && ((_lhs)->offset == (_rhs)->offset))
 
static inline void
rtems_rfs_block_set_size_zero (rtems_rfs_block_size* size)
{
  size->count = 0;
  size->offset = 0;
}
 
void rtems_rfs_block_get_block_size (rtems_rfs_file_system*  fs,
                                     rtems_rfs_pos           pos,
                                     rtems_rfs_block_size*   size);
 
rtems_rfs_pos rtems_rfs_block_get_size (rtems_rfs_file_system* fs,
                                        rtems_rfs_block_size*  size);
 
#endif