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