188 lines
7.2 KiB
C
188 lines
7.2 KiB
C
/* $OpenBSD: bpb.h,v 1.7 2015/10/23 10:45:31 krw Exp $ */
|
|
/* $NetBSD: bpb.h,v 1.6 1997/10/17 11:23:35 ws Exp $ */
|
|
|
|
/*
|
|
* Written by Paul Popelka (paulp@uts.amdahl.com)
|
|
*
|
|
* You can do anything you want with this software, just don't say you wrote
|
|
* it, and don't remove this notice.
|
|
*
|
|
* This software is provided "as is".
|
|
*
|
|
* The author supplies this software to be publicly redistributed on the
|
|
* understanding that the author is not responsible for the correct
|
|
* functioning of this software in any circumstances and is not liable for
|
|
* any damages caused by this software.
|
|
*
|
|
* October 1992
|
|
*/
|
|
|
|
/*
|
|
* BIOS Parameter Block (BPB) for DOS 3.3
|
|
*/
|
|
struct bpb33 {
|
|
u_int16_t bpbBytesPerSec; /* bytes per sector */
|
|
u_int8_t bpbSecPerClust; /* sectors per cluster */
|
|
u_int16_t bpbResSectors; /* number of reserved sectors */
|
|
u_int8_t bpbFATs; /* number of FATs */
|
|
u_int16_t bpbRootDirEnts; /* number of root directory entries */
|
|
u_int16_t bpbSectors; /* total number of sectors */
|
|
u_int8_t bpbMedia; /* media descriptor */
|
|
u_int16_t bpbFATsecs; /* number of sectors per FAT */
|
|
u_int16_t bpbSecPerTrack; /* sectors per track */
|
|
u_int16_t bpbHeads; /* number of heads */
|
|
u_int16_t bpbHiddenSecs; /* number of hidden sectors */
|
|
};
|
|
|
|
/*
|
|
* BPB for DOS 5.0 The difference is bpbHiddenSecs is a short for DOS 3.3,
|
|
* and bpbHugeSectors is not in the 3.3 bpb.
|
|
*/
|
|
struct bpb50 {
|
|
u_int16_t bpbBytesPerSec; /* bytes per sector */
|
|
u_int8_t bpbSecPerClust; /* sectors per cluster */
|
|
u_int16_t bpbResSectors; /* number of reserved sectors */
|
|
u_int8_t bpbFATs; /* number of FATs */
|
|
u_int16_t bpbRootDirEnts; /* number of root directory entries */
|
|
u_int16_t bpbSectors; /* total number of sectors */
|
|
u_int8_t bpbMedia; /* media descriptor */
|
|
u_int16_t bpbFATsecs; /* number of sectors per FAT */
|
|
u_int16_t bpbSecPerTrack; /* sectors per track */
|
|
u_int16_t bpbHeads; /* number of heads */
|
|
u_int32_t bpbHiddenSecs; /* # of hidden sectors */
|
|
u_int32_t bpbHugeSectors; /* # of sectors if bpbSectors == 0 */
|
|
};
|
|
|
|
/*
|
|
* BPB for DOS 7.10 (FAT32). This one has a few extensions to bpb50.
|
|
*/
|
|
struct bpb710 {
|
|
u_int16_t bpbBytesPerSec; /* bytes per sector */
|
|
u_int8_t bpbSecPerClust; /* sectors per cluster */
|
|
u_int16_t bpbResSectors; /* number of reserved sectors */
|
|
u_int8_t bpbFATs; /* number of FATs */
|
|
u_int16_t bpbRootDirEnts; /* number of root directory entries */
|
|
u_int16_t bpbSectors; /* total number of sectors */
|
|
u_int8_t bpbMedia; /* media descriptor */
|
|
u_int16_t bpbFATsecs; /* number of sectors per FAT */
|
|
u_int16_t bpbSecPerTrack; /* sectors per track */
|
|
u_int16_t bpbHeads; /* number of heads */
|
|
u_int32_t bpbHiddenSecs; /* # of hidden sectors */
|
|
u_int32_t bpbHugeSectors; /* # of sectors if bpbSectors == 0 */
|
|
u_int32_t bpbBigFATsecs; /* like bpbFATsecs for FAT32 */
|
|
u_int16_t bpbExtFlags; /* extended flags: */
|
|
#define FATNUM 0xf /* mask for numbering active FAT */
|
|
#define FATMIRROR 0x80 /* FAT is mirrored (like it always was) */
|
|
u_int16_t bpbFSVers; /* filesystem version */
|
|
#define FSVERS 0 /* currently only 0 is understood */
|
|
u_int32_t bpbRootClust; /* start cluster for root directory */
|
|
u_int16_t bpbFSInfo; /* filesystem info structure sector */
|
|
u_int16_t bpbBackup; /* backup boot sector */
|
|
/* There is a 12 byte filler here, but we ignore it */
|
|
};
|
|
|
|
/*
|
|
* The following structures represent how the bpb's look on disk. shorts
|
|
* and longs are just character arrays of the appropriate length. This is
|
|
* because the compiler forces shorts and longs to align on word or
|
|
* halfword boundaries.
|
|
*
|
|
* XXX The little-endian code here assumes that the processor can access
|
|
* 16-bit and 32-bit quantities on byte boundaries. If this is not true,
|
|
* use the macros for the big-endian case.
|
|
*/
|
|
#include <sys/endian.h>
|
|
#if (BYTE_ORDER == LITTLE_ENDIAN) && !defined(__STRICT_ALIGNMENT)
|
|
#define getushort(x) *((u_int16_t *)(x))
|
|
#define getulong(x) *((u_int32_t *)(x))
|
|
#define putushort(p, v) (*((u_int16_t *)(p)) = (v))
|
|
#define putulong(p, v) (*((u_int32_t *)(p)) = (v))
|
|
#else
|
|
#define getushort(x) (((u_int8_t *)(x))[0] + (((u_int8_t *)(x))[1] << 8))
|
|
#define getulong(x) (((u_int8_t *)(x))[0] + (((u_int8_t *)(x))[1] << 8) \
|
|
+ (((u_int8_t *)(x))[2] << 16) \
|
|
+ (((u_int8_t *)(x))[3] << 24))
|
|
#define putushort(p, v) (((u_int8_t *)(p))[0] = (v), \
|
|
((u_int8_t *)(p))[1] = (v) >> 8)
|
|
#define putulong(p, v) (((u_int8_t *)(p))[0] = (v), \
|
|
((u_int8_t *)(p))[1] = (v) >> 8, \
|
|
((u_int8_t *)(p))[2] = (v) >> 16,\
|
|
((u_int8_t *)(p))[3] = (v) >> 24)
|
|
#endif
|
|
|
|
/*
|
|
* BIOS Parameter Block (BPB) for DOS 3.3
|
|
*/
|
|
struct byte_bpb33 {
|
|
int8_t bpbBytesPerSec[2]; /* bytes per sector */
|
|
int8_t bpbSecPerClust; /* sectors per cluster */
|
|
int8_t bpbResSectors[2]; /* number of reserved sectors */
|
|
int8_t bpbFATs; /* number of FATs */
|
|
int8_t bpbRootDirEnts[2]; /* number of root directory entries */
|
|
int8_t bpbSectors[2]; /* total number of sectors */
|
|
int8_t bpbMedia; /* media descriptor */
|
|
int8_t bpbFATsecs[2]; /* number of sectors per FAT */
|
|
int8_t bpbSecPerTrack[2]; /* sectors per track */
|
|
int8_t bpbHeads[2]; /* number of heads */
|
|
int8_t bpbHiddenSecs[2]; /* number of hidden sectors */
|
|
};
|
|
|
|
/*
|
|
* BPB for DOS 5.0 The difference is bpbHiddenSecs is a short for DOS 3.3,
|
|
* and bpbHugeSectors is not in the 3.3 bpb.
|
|
*/
|
|
struct byte_bpb50 {
|
|
int8_t bpbBytesPerSec[2]; /* bytes per sector */
|
|
int8_t bpbSecPerClust; /* sectors per cluster */
|
|
int8_t bpbResSectors[2]; /* number of reserved sectors */
|
|
int8_t bpbFATs; /* number of FATs */
|
|
int8_t bpbRootDirEnts[2]; /* number of root directory entries */
|
|
int8_t bpbSectors[2]; /* total number of sectors */
|
|
int8_t bpbMedia; /* media descriptor */
|
|
int8_t bpbFATsecs[2]; /* number of sectors per FAT */
|
|
int8_t bpbSecPerTrack[2]; /* sectors per track */
|
|
int8_t bpbHeads[2]; /* number of heads */
|
|
int8_t bpbHiddenSecs[4]; /* number of hidden sectors */
|
|
int8_t bpbHugeSectors[4]; /* # of sectors if bpbSectors == 0 */
|
|
};
|
|
|
|
/*
|
|
* BPB for DOS 7.10 (FAT32). This one has a few extensions to bpb50.
|
|
*/
|
|
struct byte_bpb710 {
|
|
u_int8_t bpbBytesPerSec[2]; /* bytes per sector */
|
|
u_int8_t bpbSecPerClust; /* sectors per cluster */
|
|
u_int8_t bpbResSectors[2]; /* number of reserved sectors */
|
|
u_int8_t bpbFATs; /* number of FATs */
|
|
u_int8_t bpbRootDirEnts[2]; /* number of root directory entries */
|
|
u_int8_t bpbSectors[2]; /* total number of sectors */
|
|
u_int8_t bpbMedia; /* media descriptor */
|
|
u_int8_t bpbFATsecs[2]; /* number of sectors per FAT */
|
|
u_int8_t bpbSecPerTrack[2]; /* sectors per track */
|
|
u_int8_t bpbHeads[2]; /* number of heads */
|
|
u_int8_t bpbHiddenSecs[4]; /* # of hidden sectors */
|
|
u_int8_t bpbHugeSectors[4]; /* # of sectors if bpbSectors == 0 */
|
|
u_int8_t bpbBigFATsecs[4]; /* like bpbFATsecs for FAT32 */
|
|
u_int8_t bpbExtFlags[2]; /* extended flags: */
|
|
u_int8_t bpbFSVers[2]; /* filesystem version */
|
|
u_int8_t bpbRootClust[4]; /* start cluster for root directory */
|
|
u_int8_t bpbFSInfo[2]; /* filesystem info structure sector */
|
|
u_int8_t bpbBackup[2]; /* backup boot sector */
|
|
/* There is a 12 byte filler here, but we ignore it */
|
|
};
|
|
|
|
/*
|
|
* FAT32 FSInfo block.
|
|
*/
|
|
struct fsinfo {
|
|
u_int8_t fsisig1[4];
|
|
u_int8_t fsifill1[480];
|
|
u_int8_t fsisig2[4];
|
|
u_int8_t fsinfree[4];
|
|
u_int8_t fsinxtfree[4];
|
|
u_int8_t fsifill2[12];
|
|
u_int8_t fsisig3[4];
|
|
u_int8_t fsifill3[508];
|
|
u_int8_t fsisig4[4];
|
|
};
|