/*
 * Copyright (c) 2004 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * 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.apple.com/publicsource and read it before using this file.
 * 
 * This 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 OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*
 * 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
 */

/*
 * Format of a boot sector.  This is the first sector on a DOS floppy disk
 * or the fist sector of a partition on a hard disk.  But, it is not the
 * first sector of a partitioned hard disk.
 */
struct bootsector33 {
	u_int8_t	bsJump[3];		/* jump inst E9xxxx or EBxx90 */
	int8_t		bsOemName[8];		/* OEM name and version */
	int8_t		bsBPB[19];		/* BIOS parameter block */
	int8_t		bsDriveNumber;		/* drive number (0x80) */
	int8_t		bsBootCode[479];	/* pad so struct is 512b */
	u_int8_t	bsBootSectSig0;
	u_int8_t	bsBootSectSig1;
#define	BOOTSIG0	0x55
#define	BOOTSIG1	0xaa
};

struct extboot {
	int8_t		exDriveNumber;		/* drive number (0x80) */
	int8_t		exReserved1;		/* reserved */
	int8_t		exBootSignature;	/* ext. boot signature (0x29) */
#define	EXBOOTSIG	0x29
	int8_t		exVolumeID[4];		/* volume ID number */
	int8_t		exVolumeLabel[11];	/* volume label */
	int8_t		exFileSysType[8];	/* fs type (FAT12 or FAT16) */
};

struct bootsector50 {
	u_int8_t	bsJump[3];		/* jump inst E9xxxx or EBxx90 */
	int8_t		bsOemName[8];		/* OEM name and version */
	int8_t		bsBPB[25];		/* BIOS parameter block */
	int8_t		bsExt[26];		/* Bootsector Extension */
	int8_t		bsBootCode[448];	/* pad so structure is 512b */
	u_int8_t	bsBootSectSig0;
	u_int8_t	bsBootSectSig1;
#define	BOOTSIG0	0x55
#define	BOOTSIG1	0xaa
};

struct bootsector710 {
	u_int8_t	bsJump[3];		/* jump inst E9xxxx or EBxx90 */
	int8_t		bsOEMName[8];		/* OEM name and version */
	int8_t		bsBPB[53];		/* BIOS parameter block */
	int8_t		bsExt[26];		/* Bootsector Extension */
	int8_t		bsBootCode[420];	/* pad so structure is 512b */
	u_int8_t	bsBootSectSig0;
	u_int8_t	bsBootSectSig1;
#define	BOOTSIG0	0x55
#define	BOOTSIG1	0xaa
};

union bootsector {
	struct bootsector33 bs33;
	struct bootsector50 bs50;
	struct bootsector710 bs710;
};


/* BPB */

/*
 * 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 */
}  __attribute__((packed));

/*
 * 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 */
} __attribute__((packed));

/*
 * 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 */
} __attribute__((packed));

#if 0
/*
 * 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 */
};
#endif

/*
 * 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];
};


/* direntry */

/*-
 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
 * Copyright (C) 1994, 1995, 1997 TooLs GmbH.
 * All rights reserved.
 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see above).
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by TooLs GmbH.
 * 4. The name of TooLs GmbH may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * Structure of a dos directory entry.
 */
struct direntry {
	u_int8_t	deName[8];	/* filename, blank filled */
#define	SLOT_EMPTY	0x00		/* slot has never been used */
#define	SLOT_E5		0x05		/* the real value is 0xe5 */
#define	SLOT_DELETED	0xe5		/* file in this slot deleted */
	u_int8_t	deExtension[3];	/* extension, blank filled */
	u_int8_t	deAttributes;	/* file attributes */
#define	ATTR_NORMAL	0x00		/* normal file */
#define	ATTR_READONLY	0x01		/* file is read-only (immutable) */
#define	ATTR_HIDDEN	0x02		/* file is hidden */
#define	ATTR_SYSTEM	0x04		/* file is a system file */
#define	ATTR_VOLUME	0x08		/* entry is a volume label */
#define	ATTR_DIRECTORY	0x10		/* entry is a directory name */
#define	ATTR_ARCHIVE	0x20		/* file is new or modified */
	u_int8_t	deLowerCase;	/* NT VFAT lower case flags */
#define	LCASE_BASE	0x08		/* filename base in lower case */
#define	LCASE_EXT	0x10		/* filename extension in lower case */
	u_int8_t	deCHundredth;	/* hundredth of seconds in CTime */
	u_int8_t	deCTime[2];	/* create time */
	u_int8_t	deCDate[2];	/* create date */
	u_int8_t	deADate[2];	/* access date */
	u_int8_t	deHighClust[2];	/* high bytes of cluster number */
	u_int8_t	deMTime[2];	/* last update time */
	u_int8_t	deMDate[2];	/* last update date */
	u_int8_t	deStartCluster[2]; /* starting cluster of file */
	u_int8_t	deFileSize[4];	/* size of file in bytes */
};

/*
 * Structure of a Win95 long name directory entry
 */
struct winentry {
	u_int8_t	weCnt;
#define	WIN_LAST	0x40
#define	WIN_CNT		0x3f
	u_int8_t	wePart1[10];
	u_int8_t	weAttributes;
#define	ATTR_WIN95	0x0f
	u_int8_t	weReserved1;
	u_int8_t	weChksum;
	u_int8_t	wePart2[12];
	u_int16_t	weReserved2;
	u_int8_t	wePart3[4];
};
#define	WIN_CHARS	13	/* Number of chars per winentry */

/*
 * Maximum filename length in Win95
 * Note: Must be < sizeof(dirent.d_name)
 */
#define	WIN_MAXLEN	255

/*
 * This is the format of the contents of the deTime field in the direntry
 * structure.
 * We don't use bitfields because we don't know how compilers for
 * arbitrary machines will lay them out.
 */
#define DT_2SECONDS_MASK	0x1F	/* seconds divided by 2 */
#define DT_2SECONDS_SHIFT	0
#define DT_MINUTES_MASK		0x7E0	/* minutes */
#define DT_MINUTES_SHIFT	5
#define DT_HOURS_MASK		0xF800	/* hours */
#define DT_HOURS_SHIFT		11

/*
 * This is the format of the contents of the deDate field in the direntry
 * structure.
 */
#define DD_DAY_MASK		0x1F	/* day of month */
#define DD_DAY_SHIFT		0
#define DD_MONTH_MASK		0x1E0	/* month */
#define DD_MONTH_SHIFT		5
#define DD_YEAR_MASK		0xFE00	/* year - 1980 */
#define DD_YEAR_SHIFT		9