1 /*
2 * msdos common header file
3 * [obtained from mtools -wfj]
4 * how to decipher DOS disk structures in coexisting with DOS
5 *
6 * $FreeBSD$
7 */
8
9 #define MSECTOR_SIZE 512 /* MSDOS sector size in bytes */
10 #define MDIR_SIZE 32 /* MSDOS directory size in bytes */
11 #define MAX_CLUSTER 8192 /* largest cluster size */
12 #define MAX_PATH 128 /* largest MSDOS path length */
13 #define MAX_DIR_SECS 64 /* largest directory (in sectors) */
14
15 #define NEW 1
16 #define OLD 0
17
18 struct directory {
19 unsigned char name[8]; /* file name */
20 unsigned char ext[3]; /* file extension */
21 unsigned char attr; /* attribute byte */
22 unsigned char reserved[10]; /* ?? */
23 unsigned char time[2]; /* time stamp */
24 unsigned char date[2]; /* date stamp */
25 unsigned char start[2]; /* starting cluster number */
26 unsigned char size[4]; /* size of the file */
27 };
28
29 struct bootsector {
30 unsigned char jump[3]; /* Jump to boot code */
31 unsigned char banner[8]; /* OEM name & version */
32 unsigned char secsiz[2]; /* Bytes per sector hopefully 512 */
33 unsigned char clsiz; /* Cluster size in sectors */
34 unsigned char nrsvsect[2]; /* Number of reserved (boot) sectors */
35 unsigned char nfat; /* Number of FAT tables hopefully 2 */
36 unsigned char dirents[2]; /* Number of directory slots */
37 unsigned char psect[2]; /* Total sectors on disk */
38 unsigned char descr; /* Media descriptor=first byte of FAT */
39 unsigned char fatlen[2]; /* Sectors in FAT */
40 unsigned char nsect[2]; /* Sectors/track */
41 unsigned char nheads[2]; /* Heads */
42 unsigned char nhs[4]; /* number of hidden sectors */
43 unsigned char bigsect[4]; /* big total sectors */
44 unsigned char junk[476]; /* who cares? */
45 };
46
47 /* DOS partition table -- located in boot block */
48
49 #define DOSBBSECTOR 0 /* DOS boot block relative sector number */
50 #define DOSPARTOFF 446
51 #define NDOSPART 4
52
53 struct dos_partition {
54 unsigned char dp_flag; /* bootstrap flags */
55 unsigned char dp_shd; /* starting head */
56 unsigned char dp_ssect; /* starting sector */
57 unsigned char dp_scyl; /* starting cylinder */
58 unsigned char dp_typ; /* partition type */
59 #define DOSPTYP_386BSD 0xa5 /* 386BSD partition type */
60 unsigned char dp_ehd; /* end head */
61 unsigned char dp_esect; /* end sector */
62 unsigned char dp_ecyl; /* end cylinder */
63 unsigned long dp_start; /* absolute starting sector number */
64 unsigned long dp_size; /* partition size in sectors */
65 } dos_partitions[NDOSPART];
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