/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (C) 1995, 1996, 1997 Wolfgang Solfrank
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* Copyright (c) 1995 Martin Husemann
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* Some structure declaration borrowed from Paul Popelka
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* (paulp@uts.amdahl.com), see /sys/msdosfs/ for reference.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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* $NetBSD: dosfs.h,v 1.4 1997/01/03 14:32:48 ws Exp $
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* $FreeBSD$
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*/
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#ifndef DOSFS_H
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#define DOSFS_H
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/* support 4Kn disk reads */
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#define DOSBOOTBLOCKSIZE_REAL 512
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#define DOSBOOTBLOCKSIZE 4096
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typedef u_int32_t cl_t; /* type holding a cluster number */
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/*
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* architecture independent description of all the info stored in a
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* FAT boot block.
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*/
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struct bootblock {
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u_int bpbBytesPerSec; /* bytes per sector */
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u_int bpbSecPerClust; /* sectors per cluster */
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u_int bpbResSectors; /* number of reserved sectors */
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u_int bpbFATs; /* number of bpbFATs */
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u_int bpbRootDirEnts; /* number of root directory entries */
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u_int32_t bpbSectors; /* total number of sectors */
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u_int bpbMedia; /* media descriptor */
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u_int bpbFATsmall; /* number of sectors per FAT */
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u_int SecPerTrack; /* sectors per track */
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u_int bpbHeads; /* number of heads */
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u_int32_t bpbHiddenSecs; /* # of hidden sectors */
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u_int32_t bpbHugeSectors; /* # of sectors if bpbbpbSectors == 0 */
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cl_t bpbRootClust; /* Start of Root Directory */
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u_int bpbFSInfo; /* FSInfo sector */
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u_int bpbBackup; /* Backup of Bootblocks */
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cl_t FSFree; /* Number of free clusters acc. FSInfo */
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cl_t FSNext; /* Next free cluster acc. FSInfo */
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/* and some more calculated values */
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u_int flags; /* some flags: */
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#define FAT32 1 /* this is a FAT32 file system */
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/*
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* Maybe, we should separate out
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* various parts of FAT32? XXX
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*/
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int ValidFat; /* valid fat if FAT32 non-mirrored */
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cl_t ClustMask; /* mask for entries in FAT */
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cl_t NumClusters; /* # of entries in a FAT */
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u_int32_t NumSectors; /* how many sectors are there */
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u_int32_t FATsecs; /* how many sectors are in FAT */
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u_int32_t NumFatEntries; /* how many entries really are there */
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u_int ClusterOffset; /* at what sector would sector 0 start */
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u_int ClusterSize; /* Cluster size in bytes */
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/* Now some statistics: */
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u_int NumFiles; /* # of plain files */
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u_int NumFree; /* # of free clusters */
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u_int NumBad; /* # of bad clusters */
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};
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struct fatEntry {
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cl_t next; /* pointer to next cluster */
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cl_t head; /* pointer to start of chain */
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u_int32_t length; /* number of clusters on chain */
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int flags; /* see below */
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};
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#define CLUST_FREE 0 /* 0 means cluster is free */
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#define CLUST_FIRST 2 /* 2 is the minimum valid cluster number */
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#define CLUST_RSRVD 0xfffffff6 /* start of reserved clusters */
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#define CLUST_BAD 0xfffffff7 /* a cluster with a defect */
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#define CLUST_EOFS 0xfffffff8 /* start of EOF indicators */
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#define CLUST_EOF 0xffffffff /* standard value for last cluster */
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/*
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* Masks for cluster values
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*/
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#define CLUST12_MASK 0xfff
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#define CLUST16_MASK 0xffff
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#define CLUST32_MASK 0xfffffff
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#define FAT_USED 1 /* This fat chain is used in a file */
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#define DOSLONGNAMELEN 256 /* long name maximal length */
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#define LRFIRST 0x40 /* first long name record */
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#define LRNOMASK 0x1f /* mask to extract long record
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* sequence number */
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/*
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* Architecture independent description of a directory entry
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*/
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struct dosDirEntry {
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struct dosDirEntry
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*parent, /* previous tree level */
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*next, /* next brother */
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*child; /* if this is a directory */
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char name[8+1+3+1]; /* alias name first part */
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char lname[DOSLONGNAMELEN]; /* real name */
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uint flags; /* attributes */
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cl_t head; /* cluster no */
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u_int32_t size; /* filesize in bytes */
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uint fsckflags; /* flags during fsck */
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};
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/* Flags in fsckflags: */
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#define DIREMPTY 1
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#define DIREMPWARN 2
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/*
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* TODO-list of unread directories
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*/
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struct dirTodoNode {
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struct dosDirEntry *dir;
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struct dirTodoNode *next;
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};
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#endif
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