3 * Stäubli Faverges - <www.staubli.com>
4 * Pierre AUBERT p.aubert@staubli.com
6 * SPDX-License-Identifier: GPL-2.0+
12 /* Definitions for Dos diskettes */
14 /* General definitions */
15 #define SZ_STD_SECTOR 512 /* Standard sector size */
16 #define MDIR_SIZE 32 /* Direntry size */
17 #define FAT_BITS 12 /* Diskette use 12 bits fat */
19 #define MAX_PATH 128 /* Max size of the MSDOS PATH */
20 #define MAX_DIR_SECS 64 /* Taille max d'un repertoire (en */
22 /* Misc. definitions */
23 #define DELMARK '\xe5'
24 #define EXTENDED_BOOT (0x29)
25 #define MEDIA_STD (0xf0)
26 #define JUMP_0_1 (0xe9)
27 #define JUMP_0_2 (0xeb)
29 /* Boot size is 256 bytes, but we need to read almost a sector, then
30 assume bootsize is 512 */
33 /* Fat definitions for 12 bits fat */
34 #define FAT12_MAX_NB 4086
35 #define FAT12_LAST 0x0ff6
36 #define FAT12_END 0x0fff
39 #define ATTR_READONLY 0x01
40 #define ATTR_HIDDEN 0x02
41 #define ATTR_SYSTEM 0x04
42 #define ATTR_VOLUME 0x08
43 #define ATTR_DIRECTORY 0x10
44 #define ATTR_ARCHIVE 0x20
51 /* Definition of the boot sector */
55 typedef struct bootsector
57 unsigned char jump [3]; /* 0 Jump to boot code */
58 char banner [BANNER_LG]; /* 3 OEM name & version */
59 unsigned short secsiz; /* 11 Bytes per sector hopefully 512 */
60 unsigned char clsiz; /* 13 Cluster size in sectors */
61 unsigned short nrsvsect; /* 14 Number of reserved (boot) sectors */
62 unsigned char nfat; /* 16 Number of FAT tables hopefully 2 */
63 unsigned short dirents; /* 17 Number of directory slots */
64 unsigned short psect; /* 19 Total sectors on disk */
65 unsigned char descr; /* 21 Media descriptor=first byte of FAT */
66 unsigned short fatlen; /* 22 Sectors in FAT */
67 unsigned short nsect; /* 24 Sectors/track */
68 unsigned short nheads; /* 26 Heads */
69 unsigned int nhs; /* 28 number of hidden sectors */
70 unsigned int bigsect; /* 32 big total sectors */
71 unsigned char physdrive; /* 36 physical drive ? */
72 unsigned char reserved; /* 37 reserved */
73 unsigned char dos4; /* 38 dos > 4.0 diskette */
74 unsigned int serial; /* 39 serial number */
75 char label [LABEL_LG]; /* 43 disk label */
76 char fat_type [8]; /* 54 FAT type */
77 unsigned char res_2m; /* 62 reserved by 2M */
78 unsigned char CheckSum; /* 63 2M checksum (not used) */
79 unsigned char fmt_2mf; /* 64 2MF format version */
80 unsigned char wt; /* 65 1 if write track after format */
81 unsigned char rate_0; /* 66 data transfer rate on track 0 */
82 unsigned char rate_any; /* 67 data transfer rate on track<>0 */
83 unsigned short BootP; /* 68 offset to boot program */
84 unsigned short Infp0; /* 70 T1: information for track 0 */
85 unsigned short InfpX; /* 72 T2: information for track<>0 */
86 unsigned short InfTm; /* 74 T3: track sectors size table */
87 unsigned short DateF; /* 76 Format date */
88 unsigned short TimeF; /* 78 Format time */
89 unsigned char junk [BOOTSIZE - 80]; /* 80 remaining data */
90 } __attribute__ ((packed)) BootSector_t;
92 /* Structure d'une entree de repertoire */
93 typedef struct directory {
94 char name [8]; /* file name */
95 char ext [3]; /* file extension */
96 unsigned char attr; /* attribute byte */
97 unsigned char Case; /* case of short filename */
98 unsigned char reserved [9]; /* ?? */
99 unsigned char time [2]; /* time stamp */
100 unsigned char date [2]; /* date stamp */
101 unsigned short start; /* starting cluster number */
102 unsigned int size; /* size of the file */
103 } __attribute__ ((packed)) Directory_t;
106 #define MAX_VFAT_SUBENTRIES 20
107 #define VSE_NAMELEN 13
113 #define VBUFSIZE ((MAX_VFAT_SUBENTRIES * VSE_NAMELEN) + 1)
115 #define MAX_VNAMELEN (255)
117 #define VSE_PRESENT 0x01
118 #define VSE_LAST 0x40
119 #define VSE_MASK 0x1f
121 /* Flag used by vfat_lookup */
123 #define ACCEPT_PLAIN 0x20
124 #define ACCEPT_DIR 0x10
125 #define ACCEPT_LABEL 0x08
127 #define MATCH_ANY 0x40
129 struct vfat_subentry {
130 unsigned char id; /* VSE_LAST pour la fin, VSE_MASK */
132 char text1 [VSE1SIZE * 2]; /* Caracteres encodes sur 16 bits */
133 unsigned char attribute; /* 0x0f pour les VFAT */
134 unsigned char hash1; /* toujours 0 */
135 unsigned char sum; /* Checksum du nom court */
136 char text2 [VSE2SIZE * 2]; /* Caracteres encodes sur 16 bits */
137 unsigned char sector_l; /* 0 pour les VFAT */
138 unsigned char sector_u; /* 0 pour les VFAT */
139 char text3 [VSE3SIZE * 2]; /* Caracteres encodes sur 16 bits */
140 } __attribute__ ((packed)) ;
143 char name [VBUFSIZE];
144 int status; /* is now a bit map of 32 bits */
146 unsigned char sum; /* no need to remember the sum for each */
147 /* entry, it is the same anyways */
148 } __attribute__ ((packed)) ;
150 /* Conversion macros */
151 #define DOS_YEAR(dir) (((dir)->date[1] >> 1) + 1980)
152 #define DOS_MONTH(dir) (((((dir)->date[1]&0x1) << 3) + ((dir)->date[0] >> 5)))
153 #define DOS_DAY(dir) ((dir)->date[0] & 0x1f)
154 #define DOS_HOUR(dir) ((dir)->time[1] >> 3)
155 #define DOS_MINUTE(dir) (((((dir)->time[1]&0x7) << 3) + ((dir)->time[0] >> 5)))
156 #define DOS_SEC(dir) (((dir)->time[0] & 0x1f) * 2)