mirror of
https://github.com/FDOS/kernel.git
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132b1fe579
replaced (cl == FREE || cl == 1) by (cl <= 1), UWORD cluster cast for FAT12/16, and merge if branches for link_fat(). git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@1448 6ac86273-5f31-0410-b378-82cca8765d1b
153 lines
6.8 KiB
C
153 lines
6.8 KiB
C
/****************************************************************/
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/* */
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/* fat.h */
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/* */
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/* FAT File System data structures & declarations */
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/* */
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/* November 26, 1991 */
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/* */
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/* Copyright (c) 1995 */
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/* Pasquale J. Villani */
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/* All Rights Reserved */
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/* */
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/* This file is part of DOS-C. */
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/* */
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/* DOS-C is free software; you can redistribute it and/or */
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/* modify it under the terms of the GNU General Public License */
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/* as published by the Free Software Foundation; either version */
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/* 2, or (at your option) any later version. */
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/* */
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/* DOS-C is distributed in the hope that it will be useful, but */
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/* WITHOUT ANY WARRANTY; without even the implied warranty of */
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/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See */
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/* the GNU General Public License for more details. */
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/* */
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/* You should have received a copy of the GNU General Public */
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/* License along with DOS-C; see the file COPYING. If not, */
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/* write to the Free Software Foundation, 675 Mass Ave, */
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/* Cambridge, MA 02139, USA. */
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/****************************************************************/
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#ifdef MAIN
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#ifdef VERSION_STRINGS
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static BYTE *fat_hRcsId =
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"$Id$";
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#endif
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#endif
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/* FAT file system attribute bits */
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#define D_NORMAL 0 /* normal */
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#define D_RDONLY 0x01 /* read-only file */
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#define D_HIDDEN 0x02 /* hidden */
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#define D_SYSTEM 0x04 /* system */
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#define D_VOLID 0x08 /* volume id */
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#define D_DIR 0x10 /* subdir */
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#define D_ARCHIVE 0x20 /* archive bit */
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/* /// Added D_DEVICE bit. - Ron Cemer */
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#define D_DEVICE 0x40 /* device bit */
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#define D_LFN (D_RDONLY | D_HIDDEN | D_SYSTEM | D_VOLID)
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#define D_ALL (D_RDONLY | D_HIDDEN | D_SYSTEM | D_DIR | D_ARCHIVE)
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/* FAT file name constants */
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#define FNAME_SIZE 8
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#define FEXT_SIZE 3
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/* FAT deleted flag */
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#define DELETED '\x5' /* if first char, delete file */
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#define EXT_DELETED '\xe5' /* external deleted flag */
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/* Test for 16 bit or 12 bit FAT */
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#define SIZEOF_CLST16 2
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#define SIZEOF_CLST32 4
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/* FAT cluster special flags */
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#define FREE 0x000
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#ifdef WITHFAT32
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#define LONG_LAST_CLUSTER 0x0FFFFFFFUL
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#define LONG_BAD 0x0FFFFFF7UL
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#else
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#define LONG_LAST_CLUSTER 0xFFFF
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#define LONG_BAD 0xFFF7
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#endif
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#define MASK16 0xFFF8
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#define BAD16 0xFFF7
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#define MASK12 0xFF8
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#define BAD12 0xFF7
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/* magic constants: even though FF7 is BAD so FF6 could be a valid cluster
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no., MS docs specify that FF5 is the maximal possible cluster number
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for FAT12; similar for 16 and 32 */
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#define FAT_MAGIC 4085
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#define FAT_MAGIC16 65525U
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#define FAT_MAGIC32 268435455UL
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/* int ISFAT32(struct dpb FAR *dpbp);*/
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#define ISFAT32(x) _ISFAT32(x)
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/*
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#define _ISFAT32(dpbp) (((dpbp)->dpb_size)>FAT_MAGIC16 && ((dpbp)->dpb_size)<=FAT_MAGIC32 )
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*/
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#define _ISFAT32(dpbp) (((dpbp)->dpb_fatsize)==0)
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#define ISFAT16(dpbp) (((dpbp)->dpb_size)>FAT_MAGIC && ((dpbp)->dpb_size)<=FAT_MAGIC16 )
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#define ISFAT12(dpbp) ((((dpbp)->dpb_size)-1)<FAT_MAGIC)
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/* dpb_size == 0 for FAT32, hence doing -1 here */
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/* FAT file system directory entry */
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struct dirent {
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char dir_name[FNAME_SIZE + FEXT_SIZE]; /* Filename + extension in FCB format */
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UBYTE dir_attrib; /* File Attribute */
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UBYTE dir_case; /* File case */
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UBYTE dir_crtimems; /* Milliseconds */
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UWORD dir_crtime; /* Creation time */
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UWORD dir_crdate; /* Creation date */
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UWORD dir_accdate; /* Last access date */
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UWORD dir_start_high; /* High word of the cluster */
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time dir_time; /* Time file created/updated */
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date dir_date; /* Date file created/updated */
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UWORD dir_start; /* Starting cluster */
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/* 1st available = 2 */
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ULONG dir_size; /* File size in bytes */
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};
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struct lfn_entry {
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UBYTE lfn_id; /* Sequence number for this LFN entry */
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UNICODE lfn_name0_4[5]; /* First 5 characters of LFN */
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UBYTE lfn_attrib; /* LFN attribute, should be D_LFN == 0x0f */
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UBYTE lfn_reserved1;
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UBYTE lfn_checksum; /* Checksum for the corresponding 8.3 name */
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UNICODE lfn_name5_10[6]; /* Next 6 characters of LFN */
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UWORD lfn_reserved2;
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UNICODE lfn_name11_12[2]; /* Last 2 characters of LFN */
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};
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/* */
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/* filesystem sizeof(dirent) - may be different from core */
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/* */
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#ifdef WITHFAT32
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struct dpb;
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CLUSTER getdstart(struct dpb FAR *dpbp, struct dirent *dentry);
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void setdstart(struct dpb FAR *dpbp, struct dirent *dentry, CLUSTER value);
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#else
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#define getdstart(dpbp, dentry) \
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((dentry)->dir_start)
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#define setdstart(dpbp, dentry, value) \
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(((dentry)->dir_start) = (UWORD)(value))
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#endif
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#define DIR_NAME 0
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#define DIR_EXT FNAME_SIZE
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#define DIR_ATTRIB (FNAME_SIZE+FEXT_SIZE)
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#define DIR_RESERVED (FNAME_SIZE+FEXT_SIZE+1)
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#define DIR_START_HIGH (FNAME_SIZE+FEXT_SIZE+9)
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#define DIR_TIME (FNAME_SIZE+FEXT_SIZE+11)
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#define DIR_DATE (FNAME_SIZE+FEXT_SIZE+13)
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#define DIR_START (FNAME_SIZE+FEXT_SIZE+15)
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#define DIR_SIZE (FNAME_SIZE+FEXT_SIZE+17)
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#define DIRENT_SIZE 32
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