fs/fdos/dos.h

   1 /*
   2  * (C) Copyright 2002
   3  * Stäubli Faverges - <www.staubli.com>
   4  * Pierre AUBERT  p.aubert@staubli.com
   5  *
   6  * See file CREDITS for list of people who contributed to this
   7  * project.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 of
  12  * the License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  22  * MA 02111-1307 USA
  23  */
  24
  25 #ifndef _DOS_H_
  26 #define _DOS_H_
  27
  28 /* Definitions for Dos diskettes                                             */
  29
  30 /* General definitions                                                       */
  31 #define SZ_STD_SECTOR   512             /* Standard sector size              */
  32 #define MDIR_SIZE       32              /* Direntry size                     */
  33 #define FAT_BITS        12              /* Diskette use 12 bits fat          */
  34
  35 #define MAX_PATH        128             /* Max size of the MSDOS PATH        */
  36 #define MAX_DIR_SECS    64              /* Taille max d'un repertoire (en    */
  37                                         /* secteurs)                         */
  38 /* Misc. definitions                                                         */
  39 #define DELMARK         '\xe5'
  40 #define EXTENDED_BOOT   (0x29)
  41 #define MEDIA_STD       (0xf0)
  42 #define JUMP_0_1        (0xe9)
  43 #define JUMP_0_2        (0xeb)
  44
  45 /* Boot size is 256 bytes, but we need to read almost a sector, then
  46    assume bootsize is 512                                                    */
  47 #define BOOTSIZE        512
  48
  49 /* Fat definitions for 12 bits fat                                           */
  50 #define FAT12_MAX_NB    4086
  51 #define FAT12_LAST      0x0ff6
  52 #define FAT12_END       0x0fff
  53
  54 /* file attributes                                                           */
  55 #define ATTR_READONLY           0x01
  56 #define ATTR_HIDDEN             0x02
  57 #define ATTR_SYSTEM             0x04
  58 #define ATTR_VOLUME             0x08
  59 #define ATTR_DIRECTORY          0x10
  60 #define ATTR_ARCHIVE            0x20
  61 #define ATTR_VSE                0x0f
  62
  63 /* Name format                                                               */
  64 #define EXTCASE                 0x10
  65 #define BASECASE                0x8
  66
  67 /* Definition of the boot sector                                             */
  68 #define BANNER_LG               8
  69 #define LABEL_LG                11
  70
  71 typedef struct bootsector
  72 {
  73     unsigned char jump [3];     /* 0  Jump to boot code                      */
  74     char banner [BANNER_LG];    /* 3  OEM name & version                     */
  75     unsigned short secsiz;      /* 11 Bytes per sector hopefully 512         */
  76     unsigned char clsiz;        /* 13 Cluster size in sectors                */
  77     unsigned short nrsvsect;    /* 14 Number of reserved (boot) sectors      */
  78     unsigned char nfat;         /* 16 Number of FAT tables hopefully 2       */
  79     unsigned short dirents;     /* 17 Number of directory slots              */
  80     unsigned short psect;       /* 19 Total sectors on disk                  */
  81     unsigned char descr;        /* 21 Media descriptor=first byte of FAT     */
  82     unsigned short fatlen;      /* 22 Sectors in FAT                         */
  83     unsigned short nsect;       /* 24 Sectors/track                          */
  84     unsigned short nheads;      /* 26 Heads                                  */
  85     unsigned int nhs;           /* 28 number of hidden sectors               */
  86     unsigned int bigsect;       /* 32 big total sectors                      */
  87     unsigned char physdrive;    /* 36 physical drive ?                       */
  88     unsigned char reserved;     /* 37 reserved                               */
  89     unsigned char dos4;         /* 38 dos > 4.0 diskette                     */
  90     unsigned int serial;        /* 39 serial number                          */
  91     char label [LABEL_LG];      /* 43 disk label                             */
  92     char fat_type [8];          /* 54 FAT type                               */
  93     unsigned char res_2m;       /* 62 reserved by 2M                         */
  94     unsigned char CheckSum;     /* 63 2M checksum (not used)                 */
  95     unsigned char fmt_2mf;      /* 64 2MF format version                     */
  96     unsigned char wt;           /* 65 1 if write track after format          */
  97     unsigned char rate_0;       /* 66 data transfer rate on track 0          */
  98     unsigned char rate_any;     /* 67 data transfer rate on track<>0         */
  99     unsigned short BootP;       /* 68 offset to boot program                 */
 100     unsigned short Infp0;       /* 70 T1: information for track 0            */
 101     unsigned short InfpX;       /* 72 T2: information for track<>0           */
 102     unsigned short InfTm;       /* 74 T3: track sectors size table           */
 103     unsigned short DateF;       /* 76 Format date                            */
 104     unsigned short TimeF;       /* 78 Format time                            */
 105     unsigned char junk [BOOTSIZE - 80]; /* 80 remaining data                 */
 106 } __attribute__ ((packed)) BootSector_t;
 107
 108 /* Structure d'une entree de repertoire                                      */
 109 typedef struct directory {
 110     char name [8];              /* file name                                 */
 111     char ext [3];               /* file extension                            */
 112     unsigned char attr;         /* attribute byte                            */
 113     unsigned char Case;         /* case of short filename                    */
 114     unsigned char reserved [9]; /* ??                                        */
 115     unsigned char time [2];     /* time stamp                                */
 116     unsigned char date [2];     /* date stamp                                */
 117     unsigned short start;       /* starting cluster number                   */
 118     unsigned int size;          /* size of the file                          */
 119 } __attribute__ ((packed))  Directory_t;
 120
 121
 122 #define MAX_VFAT_SUBENTRIES 20
 123 #define VSE_NAMELEN 13
 124
 125 #define VSE1SIZE 5
 126 #define VSE2SIZE 6
 127 #define VSE3SIZE 2
 128
 129 #define VBUFSIZE ((MAX_VFAT_SUBENTRIES * VSE_NAMELEN) + 1)
 130
 131 #define MAX_VNAMELEN (255)
 132
 133 #define VSE_PRESENT 0x01
 134 #define VSE_LAST 0x40
 135 #define VSE_MASK 0x1f
 136
 137 /* Flag used by vfat_lookup                                                  */
 138 #define DO_OPEN         1
 139 #define ACCEPT_PLAIN    0x20
 140 #define ACCEPT_DIR      0x10
 141 #define ACCEPT_LABEL    0x08
 142 #define SINGLE          2
 143 #define MATCH_ANY       0x40
 144
 145 struct vfat_subentry {
 146     unsigned char id;                   /* VSE_LAST pour la fin, VSE_MASK    */
 147                                         /* pour un VSE                       */
 148     char text1 [VSE1SIZE * 2];          /* Caracteres encodes sur 16 bits    */
 149     unsigned char attribute;            /* 0x0f pour les VFAT                */
 150     unsigned char hash1;                /* toujours 0                        */
 151     unsigned char sum;                  /* Checksum du nom court             */
 152     char text2 [VSE2SIZE * 2];          /* Caracteres encodes sur 16 bits    */
 153     unsigned char sector_l;             /* 0 pour les VFAT                   */
 154     unsigned char sector_u;             /* 0 pour les VFAT                   */
 155     char text3 [VSE3SIZE * 2];          /* Caracteres encodes sur 16 bits    */
 156 } __attribute__ ((packed)) ;
 157
 158 struct vfat_state {
 159     char name [VBUFSIZE];
 160     int status;             /* is now a bit map of 32 bits                   */
 161     int subentries;
 162     unsigned char sum;      /* no need to remember the sum for each          */
 163                             /*   entry, it is the same anyways               */
 164 } __attribute__ ((packed)) ;
 165
 166 /* Conversion macros                                                         */
 167 #define DOS_YEAR(dir) (((dir)->date[1] >> 1) + 1980)
 168 #define DOS_MONTH(dir) (((((dir)->date[1]&0x1) << 3) + ((dir)->date[0] >> 5)))
 169 #define DOS_DAY(dir) ((dir)->date[0] & 0x1f)
 170 #define DOS_HOUR(dir) ((dir)->time[1] >> 3)
 171 #define DOS_MINUTE(dir) (((((dir)->time[1]&0x7) << 3) + ((dir)->time[0] >> 5)))
 172 #define DOS_SEC(dir) (((dir)->time[0] & 0x1f) * 2)
 173
 174
 175 #endif