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FAT32 partitions. Unfortunately, we looked around here at Walnut Creek CDROM for any newer FAT32-supporting versions of Win95 and we were unsuccessful; only the older stuff here. So this is untested beyond simply making sure it compiles and someone with access to an actual FAT32 fs will have to let us know how well it actually works. Submitted by: Dmitrij Tejblum <dima@tejblum.dnttm.rssi.ru> Obtained from: NetBSD
210 lines
8.0 KiB
C
210 lines
8.0 KiB
C
/* $Id: bpb.h,v 1.5 1997/02/22 09:40:44 peter Exp $ */
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/* $NetBSD: bpb.h,v 1.7 1997/11/17 15:36:24 ws Exp $ */
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/*
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* Written by Paul Popelka (paulp@uts.amdahl.com)
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*
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* You can do anything you want with this software, just don't say you wrote
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* it, and don't remove this notice.
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*
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* This software is provided "as is".
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*
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* The author supplies this software to be publicly redistributed on the
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* understanding that the author is not responsible for the correct
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* functioning of this software in any circumstances and is not liable for
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* any damages caused by this software.
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*
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* October 1992
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*/
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/*
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* BIOS Parameter Block (BPB) for DOS 3.3
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*/
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struct bpb33 {
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u_int16_t bpbBytesPerSec; /* bytes per sector */
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u_int8_t bpbSecPerClust; /* sectors per cluster */
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u_int16_t bpbResSectors; /* number of reserved sectors */
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u_int8_t bpbFATs; /* number of FATs */
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u_int16_t bpbRootDirEnts; /* number of root directory entries */
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u_int16_t bpbSectors; /* total number of sectors */
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u_int8_t bpbMedia; /* media descriptor */
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u_int16_t bpbFATsecs; /* number of sectors per FAT */
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u_int16_t bpbSecPerTrack; /* sectors per track */
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u_int16_t bpbHeads; /* number of heads */
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u_int16_t bpbHiddenSecs; /* number of hidden sectors */
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};
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/*
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* BPB for DOS 5.0 The difference is bpbHiddenSecs is a short for DOS 3.3,
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* and bpbHugeSectors is not in the 3.3 bpb.
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*/
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struct bpb50 {
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u_int16_t bpbBytesPerSec; /* bytes per sector */
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u_int8_t bpbSecPerClust; /* sectors per cluster */
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u_int16_t bpbResSectors; /* number of reserved sectors */
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u_int8_t bpbFATs; /* number of FATs */
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u_int16_t bpbRootDirEnts; /* number of root directory entries */
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u_int16_t bpbSectors; /* total number of sectors */
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u_int8_t bpbMedia; /* media descriptor */
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u_int16_t bpbFATsecs; /* number of sectors per FAT */
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u_int16_t bpbSecPerTrack; /* sectors per track */
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u_int16_t bpbHeads; /* number of heads */
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u_int32_t bpbHiddenSecs; /* # of hidden sectors */
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u_int32_t bpbHugeSectors; /* # of sectors if bpbSectors == 0 */
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};
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/*
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* BPB for DOS 7.10 (FAT32). This one has a few extensions to bpb50.
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*/
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struct bpb710 {
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u_int16_t bpbBytesPerSec; /* bytes per sector */
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u_int8_t bpbSecPerClust; /* sectors per cluster */
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u_int16_t bpbResSectors; /* number of reserved sectors */
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u_int8_t bpbFATs; /* number of FATs */
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u_int16_t bpbRootDirEnts; /* number of root directory entries */
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u_int16_t bpbSectors; /* total number of sectors */
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u_int8_t bpbMedia; /* media descriptor */
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u_int16_t bpbFATsecs; /* number of sectors per FAT */
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u_int16_t bpbSecPerTrack; /* sectors per track */
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u_int16_t bpbHeads; /* number of heads */
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u_int32_t bpbHiddenSecs; /* # of hidden sectors */
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u_int32_t bpbHugeSectors; /* # of sectors if bpbSectors == 0 */
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u_int32_t bpbBigFATsecs; /* like bpbFATsecs for FAT32 */
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u_int16_t bpbExtFlags; /* extended flags: */
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#define FATNUM 0xf /* mask for numbering active FAT */
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#define FATMIRROR 0x80 /* FAT is mirrored (like it always was) */
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u_int16_t bpbFSVers; /* filesystem version */
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#define FSVERS 0 /* currently only 0 is understood */
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u_int32_t bpbRootClust; /* start cluster for root directory */
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u_int16_t bpbFSInfo; /* filesystem info structure sector */
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u_int16_t bpbBackup; /* backup boot sector */
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/* There is a 12 byte filler here, but we ignore it */
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};
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#ifdef atari
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/*
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* BPB for gemdos filesystems. Atari leaves the obsolete stuff undefined.
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* Currently there is no need for a separate BPB structure.
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*/
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#if 0
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struct bpb_a {
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u_int16_t bpbBytesPerSec; /* bytes per sector */
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u_int8_t bpbSecPerClust; /* sectors per cluster */
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u_int16_t bpbResSectors; /* number of reserved sectors */
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u_int8_t bpbFATs; /* number of FATs */
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u_int16_t bpbRootDirEnts; /* number of root directory entries */
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u_int16_t bpbSectors; /* total number of sectors */
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u_int8_t bpbUseless1; /* meaningless on gemdos fs */
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u_int16_t bpbFATsecs; /* number of sectors per FAT */
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u_int16_t bpbUseless2; /* meaningless for harddisk fs */
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u_int16_t bpbUseless3; /* meaningless for harddisk fs */
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u_int16_t bpbHiddenSecs; /* the TOS-BIOS ignores this */
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};
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#endif
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#endif /* atari */
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/*
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* The following structures represent how the bpb's look on disk. shorts
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* and longs are just character arrays of the appropriate length. This is
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* because the compiler forces shorts and longs to align on word or
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* halfword boundaries.
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*
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* XXX The little-endian code here assumes that the processor can access
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* 16-bit and 32-bit quantities on byte boundaries. If this is not true,
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* use the macros for the big-endian case.
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*/
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#include <machine/endian.h>
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#if (BYTE_ORDER == LITTLE_ENDIAN) /* && defined(UNALIGNED_ACCESS) */
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#define getushort(x) *((u_int16_t *)(x))
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#define getulong(x) *((u_int32_t *)(x))
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#define putushort(p, v) (*((u_int16_t *)(p)) = (v))
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#define putulong(p, v) (*((u_int32_t *)(p)) = (v))
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#else
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#define getushort(x) (((u_int8_t *)(x))[0] + (((u_int8_t *)(x))[1] << 8))
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#define getulong(x) (((u_int8_t *)(x))[0] + (((u_int8_t *)(x))[1] << 8) \
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+ (((u_int8_t *)(x))[2] << 16) \
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+ (((u_int8_t *)(x))[3] << 24))
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#define putushort(p, v) (((u_int8_t *)(p))[0] = (v), \
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((u_int8_t *)(p))[1] = (v) >> 8)
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#define putulong(p, v) (((u_int8_t *)(p))[0] = (v), \
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((u_int8_t *)(p))[1] = (v) >> 8, \
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((u_int8_t *)(p))[2] = (v) >> 16,\
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((u_int8_t *)(p))[3] = (v) >> 24)
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#endif
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/*
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* BIOS Parameter Block (BPB) for DOS 3.3
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*/
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struct byte_bpb33 {
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int8_t bpbBytesPerSec[2]; /* bytes per sector */
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int8_t bpbSecPerClust; /* sectors per cluster */
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int8_t bpbResSectors[2]; /* number of reserved sectors */
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int8_t bpbFATs; /* number of FATs */
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int8_t bpbRootDirEnts[2]; /* number of root directory entries */
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int8_t bpbSectors[2]; /* total number of sectors */
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int8_t bpbMedia; /* media descriptor */
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int8_t bpbFATsecs[2]; /* number of sectors per FAT */
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int8_t bpbSecPerTrack[2]; /* sectors per track */
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int8_t bpbHeads[2]; /* number of heads */
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int8_t bpbHiddenSecs[2]; /* number of hidden sectors */
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};
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/*
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* BPB for DOS 5.0 The difference is bpbHiddenSecs is a short for DOS 3.3,
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* and bpbHugeSectors is not in the 3.3 bpb.
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*/
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struct byte_bpb50 {
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int8_t bpbBytesPerSec[2]; /* bytes per sector */
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int8_t bpbSecPerClust; /* sectors per cluster */
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int8_t bpbResSectors[2]; /* number of reserved sectors */
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int8_t bpbFATs; /* number of FATs */
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int8_t bpbRootDirEnts[2]; /* number of root directory entries */
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int8_t bpbSectors[2]; /* total number of sectors */
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int8_t bpbMedia; /* media descriptor */
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int8_t bpbFATsecs[2]; /* number of sectors per FAT */
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int8_t bpbSecPerTrack[2]; /* sectors per track */
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int8_t bpbHeads[2]; /* number of heads */
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int8_t bpbHiddenSecs[4]; /* number of hidden sectors */
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int8_t bpbHugeSectors[4]; /* # of sectors if bpbSectors == 0 */
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};
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/*
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* BPB for DOS 7.10 (FAT32). This one has a few extensions to bpb50.
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*/
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struct byte_bpb710 {
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u_int8_t bpbBytesPerSec[2]; /* bytes per sector */
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u_int8_t bpbSecPerClust; /* sectors per cluster */
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u_int8_t bpbResSectors[2]; /* number of reserved sectors */
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u_int8_t bpbFATs; /* number of FATs */
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u_int8_t bpbRootDirEnts[2]; /* number of root directory entries */
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u_int8_t bpbSectors[2]; /* total number of sectors */
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u_int8_t bpbMedia; /* media descriptor */
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u_int8_t bpbFATsecs[2]; /* number of sectors per FAT */
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u_int8_t bpbSecPerTrack[2]; /* sectors per track */
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u_int8_t bpbHeads[2]; /* number of heads */
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u_int8_t bpbHiddenSecs[4]; /* # of hidden sectors */
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u_int8_t bpbHugeSectors[4]; /* # of sectors if bpbSectors == 0 */
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u_int8_t bpbBigFATsecs[4]; /* like bpbFATsecs for FAT32 */
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u_int8_t bpbExtFlags[2]; /* extended flags: */
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u_int8_t bpbFSVers[2]; /* filesystem version */
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u_int8_t bpbRootClust[4]; /* start cluster for root directory */
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u_int8_t bpbFSInfo[2]; /* filesystem info structure sector */
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u_int8_t bpbBackup[2]; /* backup boot sector */
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/* There is a 12 byte filler here, but we ignore it */
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};
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/*
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* FAT32 FSInfo block.
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*/
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struct fsinfo {
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u_int8_t fsisig1[4];
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u_int8_t fsifill1[480];
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u_int8_t fsisig2[4];
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u_int8_t fsinfree[4];
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u_int8_t fsinxtfree[4];
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u_int8_t fsifill2[12];
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u_int8_t fsisig3[4];
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u_int8_t fsifill3[508];
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u_int8_t fsisig4[4];
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};
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