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5a18de7cbb
FreeDOS/hdr/fat.h
Bart Oldeman 5a18de7cbb Kernel 2025a final changes. 
git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@321 6ac86273-5f31-0410-b378-82cca8765d1b
2001-11-13 23:36:45 +00:00

222 lines
8.2 KiB
C
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/****************************************************************/
/* */
/* fat.h */
/* */
/* FAT File System data structures & declarations */
/* */
/* November 26, 1991 */
/* */
/* Copyright (c) 1995 */
/* Pasquale J. Villani */
/* All Rights Reserved */
/* */
/* This file is part of DOS-C. */
/* */
/* DOS-C is free software; you can redistribute it and/or */
/* modify it under the terms of the GNU General Public License */
/* as published by the Free Software Foundation; either version */
/* 2, or (at your option) any later version. */
/* */
/* DOS-C is distributed in the hope that it will be useful, but */
/* WITHOUT ANY WARRANTY; without even the implied warranty of */
/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See */
/* the GNU General Public License for more details. */
/* */
/* You should have received a copy of the GNU General Public */
/* License along with DOS-C; see the file COPYING. If not, */
/* write to the Free Software Foundation, 675 Mass Ave, */
/* Cambridge, MA 02139, USA. */
/****************************************************************/
#ifdef MAIN
#ifdef VERSION_STRINGS
static BYTE *fat_hRcsId = "$Id$";
#endif
#endif
/*
* $Log$
* Revision 1.10 2001/11/13 23:36:45 bartoldeman
* Kernel 2025a final changes.
*
* Revision 1.9 2001/11/04 19:47:39 bartoldeman
* kernel 2025a changes: see history.txt
*
* Revision 1.8 2001/09/23 20:39:44 bartoldeman
* FAT32 support, misc fixes, INT2F/AH=12 support, drive B: handling
*
* Revision 1.7 2001/07/09 22:19:33 bartoldeman
* LBA/FCB/FAT/SYS/Ctrl-C/ioctl fixes + memory savings
*
* Revision 1.6 2001/04/15 03:21:50 bartoldeman
* See history.txt for the list of fixes.
*
* Revision 1.5 2000/08/06 04:18:21 jimtabor
* See history.txt
*
* Revision 1.3 2000/05/25 20:56:19 jimtabor
* Fixed project history
*
* Revision 1.2 2000/05/08 04:28:22 jimtabor
* Update CVS to 2020
*
* Revision 1.1.1.1 2000/05/06 19:34:53 jhall1
* The FreeDOS Kernel. A DOS kernel that aims to be 100% compatible with
* MS-DOS. Distributed under the GNU GPL.
*
* Revision 1.2 1999/05/03 06:28:00 jprice
* Changed some variables from signed to unsigned.
*
* Revision 1.1.1.1 1999/03/29 15:39:28 jprice
* New version without IPL.SYS
*
* Revision 1.4 1999/02/01 01:40:06 jprice
* Clean up
*
* Revision 1.3 1999/01/30 08:21:43 jprice
* Clean up
*
* Revision 1.2 1999/01/22 04:17:40 jprice
* Formating
*
* Revision 1.1.1.1 1999/01/20 05:51:01 jprice
* Imported sources
*
*
* Rev 1.5 04 Jan 1998 23:14:18 patv
* Changed Log for strip utility
*
* Rev 1.4 29 May 1996 21:25:14 patv
* bug fixes for v0.91a
*
* Rev 1.3 19 Feb 1996 3:15:30 patv
* Added NLS, int2f and config.sys processing
*
* Rev 1.2 01 Sep 1995 17:35:42 patv
* First GPL release.
*
* Rev 1.1 30 Jul 1995 20:43:48 patv
* Eliminated version strings in ipl
*
* Rev 1.0 02 Jul 1995 10:39:40 patv
* Initial revision.
*/
/* FAT file system attribute bits */
#define D_NORMAL 0 /* normal */
#define D_RDONLY 0x01 /* read-only file */
#define D_HIDDEN 0x02 /* hidden */
#define D_SYSTEM 0x04 /* system */
#define D_VOLID 0x08 /* volume id */
#define D_DIR 0x10 /* subdir */
#define D_ARCHIVE 0x20 /* archive bit */
/* /// Added D_DEVICE bit. - Ron Cemer */
#define D_DEVICE 0x40 /* device bit */
#define D_LFN (D_RDONLY | D_HIDDEN | D_SYSTEM | D_VOLID)
/* FAT file name constants */
#define FNAME_SIZE 8
#define FEXT_SIZE 3
/* FAT deleted flag */
#define DELETED 0xe5 /* if first char, delete file */
/* FAT cluster to physical conversion macros */
#define clus_add(cl_no) ((ULONG) (((ULONG) cl_no - 2L) \
* (ULONG) cluster_size \
+ (ULONG) data_start))
/* Test for 16 bit or 12 bit FAT */
#define SIZEOF_CLST16 2
#define SIZEOF_CLST32 4
#define FAT_MAGIC 4086
#define FAT_MAGIC16 ((unsigned)65526l)
#define FAT_MAGIC32 268435456l
/* int ISFAT32(struct dpb FAR *dpbp);*/
#define ISFAT32(x) _ISFAT32(x)
/*
#define _ISFAT32(dpbp) (((dpbp)->dpb_size)>FAT_MAGIC16 && ((dpbp)->dpb_size)<=FAT_MAGIC32 )
*/
#define _ISFAT32(dpbp) (((dpbp)->dpb_fatsize)==0)
#define ISFAT16(dpbp) (((dpbp)->dpb_size)>FAT_MAGIC && ((dpbp)->dpb_size)<=FAT_MAGIC16 )
#define ISFAT12(dpbp) ((((dpbp)->dpb_size)-1)<FAT_MAGIC)
/* dpb_size == 0 for FAT32, hence doing -1 here */
/* FAT file system directory entry */
struct dirent
{
UBYTE dir_name[FNAME_SIZE]; /* Filename */
UBYTE dir_ext[FEXT_SIZE]; /* Filename extension */
UBYTE dir_attrib; /* File Attribute */
UBYTE dir_case; /* File case */
UBYTE dir_crtimems; /* Milliseconds */
UWORD dir_crtime; /* Creation time */
UWORD dir_crdate; /* Creation date */
UWORD dir_accdate; /* Last access date */
UWORD dir_start_high; /* High word of the cluster */
time dir_time; /* Time file created/updated */
date dir_date; /* Date file created/updated */
UWORD dir_start; /* Starting cluster */
/* 1st available = 2 */
ULONG dir_size; /* File size in bytes */
};
struct lfn_entry
{
UBYTE lfn_id;
UNICODE lfn_name0_4[5];
UBYTE lfn_attrib;
UBYTE lfn_reserved1;
UBYTE lfn_checksum;
UNICODE lfn_name5_10[6];
UWORD lfn_reserved2;
UNICODE lfn_name11_12[2];
};
/* */
/* filesystem sizeof(dirent) - may be different from core */
/* */
#ifdef WITHFAT32
#define getdstart(dentry) \
(((ULONG)dentry.dir_start_high << 16) | dentry.dir_start)
#define setdstart(dentry, value) \
dentry.dir_start = (UCOUNT)value; \
dentry.dir_start_high = (UCOUNT)(value >> 16)
#define checkdstart(dentry, value) \
(dentry.dir_start == (UCOUNT)value && \
dentry.dir_start_high == (UCOUNT)(value >> 16))
#else
#define getdstart(dentry) \
dentry.dir_start
#define setdstart(dentry, value) \
dentry.dir_start = (UCOUNT)value
#define checkdstart(dentry, value) \
(dentry.dir_start == (UCOUNT)value)
#endif
#define DIR_NAME 0
#define DIR_EXT FNAME_SIZE
#define DIR_ATTRIB FNAME_SIZE+FEXT_SIZE
#define DIR_RESERVED FNAME_SIZE+FEXT_SIZE+1
#define DIR_TIME FNAME_SIZE+FEXT_SIZE+11
#define DIR_DATE FNAME_SIZE+FEXT_SIZE+13
#define DIR_START FNAME_SIZE+FEXT_SIZE+15
#define DIR_SIZE FNAME_SIZE+FEXT_SIZE+17
#define DIRENT_SIZE 32
struct lfn_inode
{
UNICODE name[256];
struct dirent l_dir;
ULONG l_diroff; /* offset of the dir entry */
};
typedef struct lfn_inode FAR * lfn_inode_ptr;
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