db/dirshort.c

   1 /*
   2  * Copyright (c) 2000 Silicon Graphics, Inc.  All Rights Reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it would be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11  *
  12  * Further, this software is distributed without any warranty that it is
  13  * free of the rightful claim of any third person regarding infringement
  14  * or the like.  Any license provided herein, whether implied or
  15  * otherwise, applies only to this software file.  Patent licenses, if
  16  * any, provided herein do not apply to combinations of this program with
  17  * other software, or any other product whatsoever.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write the Free Software Foundation, Inc., 59
  21  * Temple Place - Suite 330, Boston MA 02111-1307, USA.
  22  *
  23  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
  24  * Mountain View, CA  94043, or:
  25  *
  26  * http://www.sgi.com
  27  *
  28  * For further information regarding this notice, see:
  29  *
  30  * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
  31  */
  32
  33 #include <libxfs.h>
  34 #include "type.h"
  35 #include "faddr.h"
  36 #include "fprint.h"
  37 #include "field.h"
  38 #include "bit.h"
  39 #include "dirshort.h"
  40
  41 static int      dir_sf_entry_name_count(void *obj, int startoff);
  42 static int      dir_shortform_list_count(void *obj, int startoff);
  43 static int      dir_shortform_list_offset(void *obj, int startoff, int idx);
  44
  45 #define OFF(f)  bitize(offsetof(xfs_dir_shortform_t, f))
  46 const field_t   dir_shortform_flds[] = {
  47         { "hdr", FLDT_DIR_SF_HDR, OI(OFF(hdr)), C1, 0, TYP_NONE },
  48         { "list", FLDT_DIR_SF_ENTRY, dir_shortform_list_offset,
  49           dir_shortform_list_count, FLD_ARRAY|FLD_COUNT|FLD_OFFSET, TYP_NONE },
  50         { NULL }
  51 };
  52
  53 #define HOFF(f) bitize(offsetof(xfs_dir_sf_hdr_t, f))
  54 const field_t   dir_sf_hdr_flds[] = {
  55         { "parent", FLDT_DIR_INO, OI(HOFF(parent)), C1, 0, TYP_INODE },
  56         { "count", FLDT_UINT8D, OI(HOFF(count)), C1, 0, TYP_NONE },
  57         { NULL }
  58 };
  59
  60 #define EOFF(f) bitize(offsetof(xfs_dir_sf_entry_t, f))
  61 const field_t   dir_sf_entry_flds[] = {
  62         { "inumber", FLDT_DIR_INO, OI(EOFF(inumber)), C1, 0, TYP_INODE },
  63         { "namelen", FLDT_UINT8D, OI(EOFF(namelen)), C1, 0, TYP_NONE },
  64         { "name", FLDT_CHARNS, OI(EOFF(name)), dir_sf_entry_name_count,
  65           FLD_COUNT, TYP_NONE },
  66         { NULL }
  67 };
  68
  69 static int
  70 dir_sf_entry_name_count(
  71         void                    *obj,
  72         int                     startoff)
  73 {
  74         xfs_dir_sf_entry_t      *e;
  75
  76         ASSERT(bitoffs(startoff) == 0);
  77         e = (xfs_dir_sf_entry_t *)((char *)obj + byteize(startoff));
  78         return e->namelen;
  79 }
  80
  81 int
  82 dir_sf_entry_size(
  83         void                    *obj,
  84         int                     startoff,
  85         int                     idx)
  86 {
  87         xfs_dir_sf_entry_t      *e;
  88         int                     i;
  89         xfs_dir_shortform_t     *sf;
  90
  91         ASSERT(bitoffs(startoff) == 0);
  92         sf = (xfs_dir_shortform_t *)((char *)obj + byteize(startoff));
  93         e = &sf->list[0];
  94         for (i = 0; i < idx; i++)
  95                 e = XFS_DIR_SF_NEXTENTRY(e);
  96         return bitize((int)XFS_DIR_SF_ENTSIZE_BYENTRY(e));
  97 }
  98
  99 static int
 100 dir_shortform_list_count(
 101         void                    *obj,
 102         int                     startoff)
 103 {
 104         xfs_dir_shortform_t     *sf;
 105
 106         ASSERT(bitoffs(startoff) == 0);
 107         sf = (xfs_dir_shortform_t *)((char *)obj + byteize(startoff));
 108         return sf->hdr.count;
 109 }
 110
 111 static int
 112 dir_shortform_list_offset(
 113         void                    *obj,
 114         int                     startoff,
 115         int                     idx)
 116 {
 117         xfs_dir_sf_entry_t      *e;
 118         int                     i;
 119         xfs_dir_shortform_t     *sf;
 120
 121         ASSERT(bitoffs(startoff) == 0);
 122         sf = (xfs_dir_shortform_t *)((char *)obj + byteize(startoff));
 123         e = &sf->list[0];
 124         for (i = 0; i < idx; i++)
 125                 e = XFS_DIR_SF_NEXTENTRY(e);
 126         return bitize((int)((char *)e - (char *)sf));
 127 }
 128
 129 int
 130 dirshort_size(
 131         void                    *obj,
 132         int                     startoff,
 133         int                     idx)
 134 {
 135         xfs_dir_sf_entry_t      *e;
 136         int                     i;
 137         xfs_dir_shortform_t     *sf;
 138
 139         ASSERT(bitoffs(startoff) == 0);
 140         ASSERT(idx == 0);
 141         sf = (xfs_dir_shortform_t *)((char *)obj + byteize(startoff));
 142         e = &sf->list[0];
 143         for (i = 0; i < sf->hdr.count; i++)
 144                 e = XFS_DIR_SF_NEXTENTRY(e);
 145         return bitize((int)((char *)e - (char *)sf));
 146 }