/*	$OpenBSD: fat.h,v 1.13 2021/07/11 04:34:13 jsg Exp $	*/
/*	$NetBSD: fat.h,v 1.11 1997/10/17 11:23:49 ws Exp $	*/

/*-
 * Copyright (C) 1994, 1997 Wolfgang Solfrank.
 * Copyright (C) 1994, 1997 TooLs GmbH.
 * All rights reserved.
 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
 *
 * 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.
 */
/*
 * 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
 */

/*
 * Some useful cluster numbers.
 */
#define	MSDOSFSROOT	0		/* cluster 0 means the root dir */
#define	CLUST_FREE	0		/* cluster 0 also means a free cluster */
#define	MSDOSFSFREE	CLUST_FREE
#define	CLUST_FIRST	2		/* first legal cluster number */
#define	CLUST_RSRVD	0xfffffff6	/* reserved cluster range */
#define	CLUST_BAD	0xfffffff7	/* a cluster with a defect */
#define	CLUST_EOFS	0xfffffff8	/* start of eof cluster range */
#define	CLUST_EOFE	0xffffffff	/* end of eof cluster range */
#define	CLUST_END	CLUST_EOFE	/* bigger than any valid cluster */

#define	FAT12_MASK	0x00000fff	/* mask for 12 bit cluster numbers */
#define	FAT16_MASK	0x0000ffff	/* mask for 16 bit cluster numbers */
#define	FAT32_MASK	0x0fffffff	/* mask for FAT32 cluster numbers */

/*
 * MSDOSFS:
 * Return true if filesystem uses 12 bit fats. Microsoft Programmer's
 * Reference says if the maximum cluster number in a filesystem is greater
 * than 4084 ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK) then we've got a
 * 16 bit fat filesystem. While mounting, the result of this test is stored
 * in pm_fatentrysize.
 */
#define	FAT12(pmp)	(pmp->pm_fatmask == FAT12_MASK)
#define	FAT16(pmp)	(pmp->pm_fatmask == FAT16_MASK)
#define	FAT32(pmp)	(pmp->pm_fatmask == FAT32_MASK)

#define	MSDOSFSEOF(pmp, cn)	((((cn) | ~(pmp)->pm_fatmask) & CLUST_EOFS) == CLUST_EOFS)

#ifdef _KERNEL
/*
 * These are the values for the function argument to the function
 * fatentry().
 */
#define	FAT_GET		0x0001	/* get a fat entry */
#define	FAT_SET		0x0002	/* set a fat entry */
#define	FAT_GET_AND_SET	(FAT_GET | FAT_SET)

/*
 * Flags to extendfile:
 */
#define	DE_CLEAR	1	/* Zero out the blocks allocated */

int pcbmap(struct denode *, uint32_t, daddr_t *, uint32_t *, int *);
int clusterfree(struct msdosfsmount *, uint32_t, uint32_t *);
int clusteralloc(struct msdosfsmount *, uint32_t, uint32_t, uint32_t *, uint32_t *);
int extendfile(struct denode *, uint32_t, struct buf **, uint32_t *, int);
int fatentry(int, struct msdosfsmount *, uint32_t, uint32_t *, uint32_t);
void fc_purge(struct denode *, u_int);
void fc_lookup(struct denode *, uint32_t, uint32_t *, uint32_t *);
int fillinusemap(struct msdosfsmount *);
int freeclusterchain(struct msdosfsmount *, uint32_t);
#endif	/* _KERNEL */