Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 1 | /*- |
| 2 | * SPDX-License-Identifier: BSD-2-Clause-FreeBSD |
| 3 | * |
| 4 | * Copyright (C) 1995, 1996, 1997 Wolfgang Solfrank |
| 5 | * Copyright (c) 1995 Martin Husemann |
| 6 | * Some structure declaration borrowed from Paul Popelka |
| 7 | * (paulp@uts.amdahl.com), see /sys/msdosfs/ for reference. |
| 8 | * |
| 9 | * Redistribution and use in source and binary forms, with or without |
| 10 | * modification, are permitted provided that the following conditions |
| 11 | * are met: |
| 12 | * 1. Redistributions of source code must retain the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer. |
| 14 | * 2. Redistributions in binary form must reproduce the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer in the |
| 16 | * documentation and/or other materials provided with the distribution. |
| 17 | * |
| 18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR |
| 19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 21 | * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 28 | * $NetBSD: dosfs.h,v 1.4 1997/01/03 14:32:48 ws Exp $ |
| 29 | * $FreeBSD$ |
| 30 | */ |
| 31 | |
| 32 | #ifndef DOSFS_H |
| 33 | #define DOSFS_H |
| 34 | |
| 35 | /* support 4Kn disk reads */ |
| 36 | #define DOSBOOTBLOCKSIZE_REAL 512 |
| 37 | #define DOSBOOTBLOCKSIZE 4096 |
| 38 | |
| 39 | typedef u_int32_t cl_t; /* type holding a cluster number */ |
| 40 | |
| 41 | /* |
| 42 | * architecture independent description of all the info stored in a |
| 43 | * FAT boot block. |
| 44 | */ |
| 45 | struct bootblock { |
| 46 | u_int bpbBytesPerSec; /* bytes per sector */ |
| 47 | u_int bpbSecPerClust; /* sectors per cluster */ |
| 48 | u_int bpbResSectors; /* number of reserved sectors */ |
| 49 | u_int bpbFATs; /* number of bpbFATs */ |
| 50 | u_int bpbRootDirEnts; /* number of root directory entries */ |
| 51 | u_int32_t bpbSectors; /* total number of sectors */ |
| 52 | u_int bpbMedia; /* media descriptor */ |
| 53 | u_int bpbFATsmall; /* number of sectors per FAT */ |
| 54 | u_int SecPerTrack; /* sectors per track */ |
| 55 | u_int bpbHeads; /* number of heads */ |
| 56 | u_int32_t bpbHiddenSecs; /* # of hidden sectors */ |
| 57 | u_int32_t bpbHugeSectors; /* # of sectors if bpbbpbSectors == 0 */ |
| 58 | cl_t bpbRootClust; /* Start of Root Directory */ |
| 59 | u_int bpbFSInfo; /* FSInfo sector */ |
| 60 | u_int bpbBackup; /* Backup of Bootblocks */ |
| 61 | cl_t FSFree; /* Number of free clusters acc. FSInfo */ |
| 62 | cl_t FSNext; /* Next free cluster acc. FSInfo */ |
| 63 | |
| 64 | /* and some more calculated values */ |
| 65 | u_int flags; /* some flags: */ |
| 66 | #define FAT32 1 /* this is a FAT32 file system */ |
| 67 | /* |
| 68 | * Maybe, we should separate out |
| 69 | * various parts of FAT32? XXX |
| 70 | */ |
| 71 | int ValidFat; /* valid fat if FAT32 non-mirrored */ |
| 72 | cl_t ClustMask; /* mask for entries in FAT */ |
| 73 | cl_t NumClusters; /* # of entries in a FAT */ |
| 74 | u_int32_t NumSectors; /* how many sectors are there */ |
| 75 | u_int32_t FATsecs; /* how many sectors are in FAT */ |
| 76 | u_int32_t NumFatEntries; /* how many entries really are there */ |
Xin Li | a4cbc88 | 2019-10-01 15:09:31 -0700 | [diff] [blame] | 77 | u_int FirstCluster; /* at what sector is Cluster CLUST_FIRST */ |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 78 | u_int ClusterSize; /* Cluster size in bytes */ |
| 79 | |
| 80 | /* Now some statistics: */ |
| 81 | u_int NumFiles; /* # of plain files */ |
| 82 | u_int NumFree; /* # of free clusters */ |
| 83 | u_int NumBad; /* # of bad clusters */ |
| 84 | }; |
| 85 | |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 86 | #define CLUST_FREE 0 /* 0 means cluster is free */ |
| 87 | #define CLUST_FIRST 2 /* 2 is the minimum valid cluster number */ |
| 88 | #define CLUST_RSRVD 0xfffffff6 /* start of reserved clusters */ |
| 89 | #define CLUST_BAD 0xfffffff7 /* a cluster with a defect */ |
| 90 | #define CLUST_EOFS 0xfffffff8 /* start of EOF indicators */ |
| 91 | #define CLUST_EOF 0xffffffff /* standard value for last cluster */ |
Xin Li | 21386e0 | 2020-01-03 09:22:03 -0800 | [diff] [blame] | 92 | #define CLUST_DEAD 0xfdeadc0d /* error encountered */ |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 93 | |
| 94 | /* |
| 95 | * Masks for cluster values |
| 96 | */ |
| 97 | #define CLUST12_MASK 0xfff |
| 98 | #define CLUST16_MASK 0xffff |
| 99 | #define CLUST32_MASK 0xfffffff |
| 100 | |
Xin Li | 1e1dad6 | 2019-04-10 13:38:23 -0700 | [diff] [blame] | 101 | #define DOSLONGNAMELEN 256 /* long name maximal length */ |
| 102 | #define LRFIRST 0x40 /* first long name record */ |
| 103 | #define LRNOMASK 0x1f /* mask to extract long record |
| 104 | * sequence number */ |
| 105 | |
| 106 | /* |
| 107 | * Architecture independent description of a directory entry |
| 108 | */ |
| 109 | struct dosDirEntry { |
| 110 | struct dosDirEntry |
| 111 | *parent, /* previous tree level */ |
| 112 | *next, /* next brother */ |
| 113 | *child; /* if this is a directory */ |
| 114 | char name[8+1+3+1]; /* alias name first part */ |
| 115 | char lname[DOSLONGNAMELEN]; /* real name */ |
| 116 | uint flags; /* attributes */ |
| 117 | cl_t head; /* cluster no */ |
| 118 | u_int32_t size; /* filesize in bytes */ |
| 119 | uint fsckflags; /* flags during fsck */ |
| 120 | }; |
| 121 | /* Flags in fsckflags: */ |
| 122 | #define DIREMPTY 1 |
| 123 | #define DIREMPWARN 2 |
| 124 | |
| 125 | /* |
| 126 | * TODO-list of unread directories |
| 127 | */ |
| 128 | struct dirTodoNode { |
| 129 | struct dosDirEntry *dir; |
| 130 | struct dirTodoNode *next; |
| 131 | }; |
| 132 | |
| 133 | #endif |