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/* * $OpenBSD: dosfs.h,v 1.2 1996/06/23 14:31:49 deraadt Exp $*/
/*
* Copyright (c) 1995 Joerg Wunsch
*
* All rights reserved.
*
* This program is free software.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* MS-DOS (FAT) file system structure definitions.
*
*/
#ifndef DOSFS_H
#define DOSFS_H 1
typedef u_int8_t Long[4];
typedef u_int8_t Short[2];
union bootsector {
u_char raw[512];
struct bsec {
u_char jump_boot[3]; /* jump code to boot-up partition */
char oem_name[8]; /* OEM company name & version */
Short sectsiz;/* bytes per sector */
u_char clustsiz; /* sectors per cluster */
Short ressecs;/* reserved sectors [before 1st FAT] */
u_char fatcnt; /* # of FAT's */
Short rootsiz;/* number of root dir entries */
Short totsecs;/* total # of sectors */
u_char media; /* media descriptor */
Short fatsize;/* # of sectors per FAT */
Short trksecs;/* sectors per track (cylinder) */
Short headcnt;/* # of r/w heads */
Short hidnsec;/* hidden sectors */
union {
/* case totsecs != 0: */
/* This is a partition of MS-DOS 3.3 format (< 32 MB) */
u_char bootprogram[480];
/* case totsecs == 0: */
/* partition of MS-DOS 4.0+ format, or > 32 MB */
struct {
Short unused;
Long totsecs; /* total # of sectors,
* as a 32-bit */
Short physdrv; /* physical drive #
* [0x80...] */
u_char extboot; /* extended boot
* signature??? */
Long serial; /* volume serial number */
char label[11]; /* same as volume label
* in root dir */
char fsysid[8]; /* some like `FAT16' */
u_char bootprogram[448];
} extended;
} variable_part;
u_char signature[2]; /* always {0x55, 0xaa} */
} bsec;
};
struct fat {
u_char media; /* the media descriptor again */
u_char padded; /* alway 0xff */
u_char contents[1]; /* the `1' is a placeholder only */
};
/* DOS file attributes */
#define FA_RONLY 1 /* read/only */
#define FA_HIDDEN 2 /* hidden */
#define FA_SYSTEM 4 /* system */
#define FA_VOLLABEL 8 /* this is the volume label */
#define FA_SUBDIR 0x10 /* sub-directory */
#define FA_ARCH 0x20 /* archive - file hasn't been backed up */
struct dosftime {
u_char time[2]; /* [0] & 0x1f - seconds div 2 ([1] & 7) * 8 +
* ([0] >> 5) - minutes [1] >> 3 - hours */
u_char date[2]; /* [0] & 0x1f - day ([1] & 1) * 8 + ([0] >> 5)
* - month [1] >> 1 - year - 1980 */
};
#define dosft_hour(dft) ((dft).time[1] >> 3)
#define dosft_minute(dft) (((dft).time[1] & 7) * 8 + ((dft).time[0] >> 5))
#define dosft_second(dft) (((dft).time[0] & 0x1f) * 2)
#define dosft_year(dft) (((dft).date[1] >> 1) + 1980)
#define dosft_month(dft) (((dft).date[1] & 1) * 8 + ((dft).date[0] >> 5))
#define dosft_day(dft) ((dft).date[0] & 0x1f)
struct direntry {
char name[8]; /* file name portion */
char ext[3]; /* file extension */
u_char attr; /* file attribute as above */
char reserved[10];
struct dosftime fdate; /* time created/last modified */
Short startclstr; /* starting cluster number */
Long filesiz; /* file size in bytes */
};
#define s_to_little_s(dst, src) do { \
u_int16_t tmp = htons(src); \
dst[0] = (tmp&0xff00)>>8; \
dst[1] = (tmp&0x00ff); \
} while (0);
#define l_to_little_l(dst, src) do { \
u_int32_t tmp = htonl(src); \
dst[0] = (tmp&0xff000000)>>24; \
dst[1] = (tmp&0x00ff0000)>>16; \
dst[2] = (tmp&0x0000ff00)>>8; \
dst[3] = (tmp&0x000000ff); \
} while (0);
#endif /* DOSFS_H */
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