66 lines
2.3 KiB
C
66 lines
2.3 KiB
C
/*
|
|
* msdos common header file
|
|
* [obtained from mtools -wfj]
|
|
* how to decipher DOS disk structures in coexisting with DOS
|
|
*
|
|
* $Id$
|
|
*/
|
|
|
|
#define MSECTOR_SIZE 512 /* MSDOS sector size in bytes */
|
|
#define MDIR_SIZE 32 /* MSDOS directory size in bytes */
|
|
#define MAX_CLUSTER 8192 /* largest cluster size */
|
|
#define MAX_PATH 128 /* largest MSDOS path length */
|
|
#define MAX_DIR_SECS 64 /* largest directory (in sectors) */
|
|
|
|
#define NEW 1
|
|
#define OLD 0
|
|
|
|
struct directory {
|
|
unsigned char name[8]; /* file name */
|
|
unsigned char ext[3]; /* file extension */
|
|
unsigned char attr; /* attribute byte */
|
|
unsigned char reserved[10]; /* ?? */
|
|
unsigned char time[2]; /* time stamp */
|
|
unsigned char date[2]; /* date stamp */
|
|
unsigned char start[2]; /* starting cluster number */
|
|
unsigned char size[4]; /* size of the file */
|
|
};
|
|
|
|
struct bootsector {
|
|
unsigned char jump[3]; /* Jump to boot code */
|
|
unsigned char banner[8]; /* OEM name & version */
|
|
unsigned char secsiz[2]; /* Bytes per sector hopefully 512 */
|
|
unsigned char clsiz; /* Cluster size in sectors */
|
|
unsigned char nrsvsect[2]; /* Number of reserved (boot) sectors */
|
|
unsigned char nfat; /* Number of FAT tables hopefully 2 */
|
|
unsigned char dirents[2]; /* Number of directory slots */
|
|
unsigned char psect[2]; /* Total sectors on disk */
|
|
unsigned char descr; /* Media descriptor=first byte of FAT */
|
|
unsigned char fatlen[2]; /* Sectors in FAT */
|
|
unsigned char nsect[2]; /* Sectors/track */
|
|
unsigned char nheads[2]; /* Heads */
|
|
unsigned char nhs[4]; /* number of hidden sectors */
|
|
unsigned char bigsect[4]; /* big total sectors */
|
|
unsigned char junk[476]; /* who cares? */
|
|
};
|
|
|
|
/* DOS partition table -- located in boot block */
|
|
|
|
#define DOSBBSECTOR 0 /* DOS boot block relative sector number */
|
|
#define DOSPARTOFF 446
|
|
#define NDOSPART 4
|
|
|
|
struct dos_partition {
|
|
unsigned char dp_flag; /* bootstrap flags */
|
|
unsigned char dp_shd; /* starting head */
|
|
unsigned char dp_ssect; /* starting sector */
|
|
unsigned char dp_scyl; /* starting cylinder */
|
|
unsigned char dp_typ; /* partition type */
|
|
#define DOSPTYP_386BSD 0xa5 /* 386BSD partition type */
|
|
unsigned char dp_ehd; /* end head */
|
|
unsigned char dp_esect; /* end sector */
|
|
unsigned char dp_ecyl; /* end cylinder */
|
|
unsigned long dp_start; /* absolute starting sector number */
|
|
unsigned long dp_size; /* partition size in sectors */
|
|
} dos_partitions[NDOSPART];
|