freebsd-dev/usr.sbin/mkdosfs/dosfs.h
Joerg Wunsch 828c68cf7a mkdosfs -- a tool to create an MS-DOS file system on a device or file.
Since msdosfs is part of the base system, it's not wise to rely on
something like mtools to provide this functionality.

This utility is the agreed fix for PR # misc/804      fdformat did not ...
1995-11-05 16:02:04 +00:00

136 lines
4.5 KiB
C

/*
* 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.
*
* $Id$
*/
#ifndef DOSFS_H
#define DOSFS_H 1
typedef u_char Long[4];
typedef u_char Short[2];
union bootsector
{
unsigned 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 */
};
/* handle endiannes: */
#define s_to_little_s(dst, src) dst[0]=(src)&0xff; dst[1]=((src)&0xff00)>>8
#define l_to_little_l(dst, src) \
dst[0]=(src)&0xff; dst[1]=((src)&0xff00)>>8; \
dst[2]=((src)&0xff0000)>>16; dst[3]=((src)&0xff000000)>>24
#endif /* DOSFS_H */