1/* 2 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. 3 * 4 * @APPLE_LICENSE_HEADER_START@ 5 * 6 * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved. 7 * 8 * This file contains Original Code and/or Modifications of Original Code 9 * as defined in and that are subject to the Apple Public Source License 10 * Version 2.0 (the 'License'). You may not use this file except in 11 * compliance with the License. Please obtain a copy of the License at 12 * http://www.opensource.apple.com/apsl/ and read it before using this 13 * file. 14 * 15 * The Original Code and all software distributed under the License are 16 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 17 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 18 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 20 * Please see the License for the specific language governing rights and 21 * limitations under the License. 22 * 23 * @APPLE_LICENSE_HEADER_END@ 24 */ 25/* $FreeBSD: src/sys/msdosfs/bpb.h,v 1.7 1999/08/28 00:48:07 peter Exp $ */ 26/* $NetBSD: bpb.h,v 1.7 1997/11/17 15:36:24 ws Exp $ */ 27 28/* 29 * Written by Paul Popelka (paulp@uts.amdahl.com) 30 * 31 * You can do anything you want with this software, just don't say you wrote 32 * it, and don't remove this notice. 33 * 34 * This software is provided "as is". 35 * 36 * The author supplies this software to be publicly redistributed on the 37 * understanding that the author is not responsible for the correct 38 * functioning of this software in any circumstances and is not liable for 39 * any damages caused by this software. 40 * 41 * October 1992 42 */ 43 44 45/* 46 * The following structures represent how the bpb's look on disk. shorts 47 * and longs are just character arrays of the appropriate length. This is 48 * because the compiler forces shorts and longs to align on word or 49 * halfword boundaries. 50 * 51 * XXX The little-endian code here assumes that the processor can access 52 * 16-bit and 32-bit quantities on byte boundaries. If this is not true, 53 * use the macros for the big-endian case. 54 */ 55#include <machine/endian.h> 56#if (BYTE_ORDER == LITTLE_ENDIAN) /* && defined(UNALIGNED_ACCESS) */ 57#define getushort(x) *((u_int16_t *)(x)) 58#define getulong(x) *((u_int32_t *)(x)) 59#else 60#define getushort(x) (((u_int8_t *)(x))[0] + (((u_int8_t *)(x))[1] << 8)) 61#define getulong(x) (((u_int8_t *)(x))[0] + (((u_int8_t *)(x))[1] << 8) \ 62 + (((u_int8_t *)(x))[2] << 16) \ 63 + (((u_int8_t *)(x))[3] << 24)) 64#endif 65 66/* 67 * BPB for DOS 7.10 (FAT32). This one has a few extensions to bpb50. 68 */ 69struct byte_bpb710 { 70 u_int8_t bpbBytesPerSec[2]; /* bytes per sector */ 71 u_int8_t bpbSecPerClust; /* sectors per cluster */ 72 u_int8_t bpbResSectors[2]; /* number of reserved sectors */ 73 u_int8_t bpbFATs; /* number of FATs */ 74 u_int8_t bpbRootDirEnts[2]; /* number of root directory entries */ 75 u_int8_t bpbSectors[2]; /* total number of sectors */ 76 u_int8_t bpbMedia; /* media descriptor */ 77 u_int8_t bpbFATsecs[2]; /* number of sectors per FAT */ 78 u_int8_t bpbSecPerTrack[2]; /* sectors per track */ 79 u_int8_t bpbHeads[2]; /* number of heads */ 80 u_int8_t bpbHiddenSecs[4]; /* # of hidden sectors */ 81 u_int8_t bpbHugeSectors[4]; /* # of sectors if bpbSectors == 0 */ 82 u_int8_t bpbBigFATsecs[4]; /* like bpbFATsecs for FAT32 */ 83 u_int8_t bpbExtFlags[2]; /* extended flags: */ 84 u_int8_t bpbFSVers[2]; /* filesystem version */ 85 u_int8_t bpbRootClust[4]; /* start cluster for root directory */ 86 u_int8_t bpbFSInfo[2]; /* filesystem info structure sector */ 87 u_int8_t bpbBackup[2]; /* backup boot sector */ 88 /* There is a 12 byte filler here, but we ignore it */ 89}; 90 91