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136 lines
4.5 KiB
C
136 lines
4.5 KiB
C
/*
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* Copyright (c) 1995 Joerg Wunsch
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*
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* All rights reserved.
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*
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* This program is free software.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* MS-DOS (FAT) file system structure definitions.
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*
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* $Id$
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*/
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#ifndef DOSFS_H
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#define DOSFS_H 1
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typedef u_char Long[4];
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typedef u_char Short[2];
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union bootsector
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{
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unsigned char raw[512];
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struct bsec
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{
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u_char jump_boot[3]; /* jump code to boot-up partition */
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char oem_name[8]; /* OEM company name & version */
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Short sectsiz; /* bytes per sector */
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u_char clustsiz; /* sectors per cluster */
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Short ressecs; /* reserved sectors [before 1st FAT] */
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u_char fatcnt; /* # of FAT's */
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Short rootsiz; /* number of root dir entries */
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Short totsecs; /* total # of sectors */
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u_char media; /* media descriptor */
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Short fatsize; /* # of sectors per FAT */
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Short trksecs; /* sectors per track (cylinder) */
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Short headcnt; /* # of r/w heads */
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Short hidnsec; /* hidden sectors */
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union
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{
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/* case totsecs != 0: */
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/* This is a partition of MS-DOS 3.3 format (< 32 MB) */
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u_char bootprogram[480];
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/* case totsecs == 0: */
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/* partition of MS-DOS 4.0+ format, or > 32 MB */
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struct
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{
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Short unused;
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Long totsecs; /* total # of sectors, as a 32-bit */
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Short physdrv; /* physical drive # [0x80...] */
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u_char extboot; /* extended boot signature??? */
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Long serial; /* volume serial number */
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char label[11]; /* same as volume label in root dir */
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char fsysid[8]; /* some like `FAT16' */
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u_char bootprogram[448];
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} extended;
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} variable_part;
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u_char signature[2]; /* always {0x55, 0xaa} */
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} bsec;
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};
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struct fat
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{
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u_char media; /* the media descriptor again */
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u_char padded; /* alway 0xff */
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u_char contents[1]; /* the `1' is a placeholder only */
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};
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/* DOS file attributes */
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#define FA_RONLY 1 /* read/only */
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#define FA_HIDDEN 2 /* hidden */
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#define FA_SYSTEM 4 /* system */
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#define FA_VOLLABEL 8 /* this is the volume label */
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#define FA_SUBDIR 0x10 /* sub-directory */
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#define FA_ARCH 0x20 /* archive - file hasn't been backed up */
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struct dosftime
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{
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u_char time[2]; /* [0] & 0x1f - seconds div 2
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* ([1] & 7) * 8 + ([0] >> 5) - minutes
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* [1] >> 3 - hours
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*/
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u_char date[2]; /* [0] & 0x1f - day
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* ([1] & 1) * 8 + ([0] >> 5) - month
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* [1] >> 1 - year - 1980
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*/
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};
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#define dosft_hour(dft) ((dft).time[1] >> 3)
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#define dosft_minute(dft) (((dft).time[1] & 7) * 8 + ((dft).time[0] >> 5))
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#define dosft_second(dft) (((dft).time[0] & 0x1f) * 2)
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#define dosft_year(dft) (((dft).date[1] >> 1) + 1980)
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#define dosft_month(dft) (((dft).date[1] & 1) * 8 + ((dft).date[0] >> 5))
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#define dosft_day(dft) ((dft).date[0] & 0x1f)
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struct direntry
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{
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char name[8]; /* file name portion */
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char ext[3]; /* file extension */
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u_char attr; /* file attribute as above */
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char reserved[10];
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struct dosftime fdate; /* time created/last modified */
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Short startclstr; /* starting cluster number */
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Long filesiz; /* file size in bytes */
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};
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/* handle endiannes: */
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#define s_to_little_s(dst, src) dst[0]=(src)&0xff; dst[1]=((src)&0xff00)>>8
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#define l_to_little_l(dst, src) \
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dst[0]=(src)&0xff; dst[1]=((src)&0xff00)>>8; \
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dst[2]=((src)&0xff0000)>>16; dst[3]=((src)&0xff000000)>>24
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#endif /* DOSFS_H */
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