/* * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved. * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this * file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_LICENSE_HEADER_END@ */ /* $FreeBSD: src/sys/msdosfs/bpb.h,v 1.7 1999/08/28 00:48:07 peter Exp $ */ /* $NetBSD: bpb.h,v 1.7 1997/11/17 15:36:24 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 */ /* * 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 <machine/endian.h> #if (BYTE_ORDER == LITTLE_ENDIAN) /* && defined(UNALIGNED_ACCESS) */ #define getushort(x) *((u_int16_t *)(x)) #define getulong(x) *((u_int32_t *)(x)) #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)) #endif /* * 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 */ };