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/*
* Copyright (c) 1996, 1998 Robert Nordier
* All rights reserved.
* Copyright 2024 MNX Cloud, Inc.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``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 THE AUTHOR(S) 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.
*/
#ifndef DOSIO_H
#define DOSIO_H
/*
* DOS file attributes
*/
#define FA_RDONLY 001 /* read-only */
#define FA_HIDDEN 002 /* hidden file */
#define FA_SYSTEM 004 /* system file */
#define FA_LABEL 010 /* volume label */
#define FA_DIR 020 /* directory */
#define FA_ARCH 040 /* archive (file modified) */
#define FA_XDE 017 /* extended directory entry */
#define FA_MASK 077 /* all attributes */
/*
* Macros to convert DOS-format 16-bit and 32-bit quantities
*/
#define cv2(p) ((uint16_t)(p)[0] | \
((uint16_t)(p)[1] << 010))
#define cv4(p) ((uint32_t)(p)[0] | \
((uint32_t)(p)[1] << 010) | \
((uint32_t)(p)[2] << 020) | \
((uint32_t)(p)[3] << 030))
/*
* Directory, filesystem, and file structures.
*/
typedef struct {
uchar_t x_case; /* case */
uchar_t c_hsec; /* created: secs/100 */
uchar_t c_time[2]; /* created: time */
uchar_t c_date[2]; /* created: date */
uchar_t a_date[2]; /* accessed: date */
uchar_t h_clus[2]; /* clus[hi] */
} DOS_DEX;
typedef struct {
uchar_t name[8]; /* name */
uchar_t ext[3]; /* extension */
uchar_t attr; /* attributes */
DOS_DEX dex; /* VFAT/FAT32 only */
uchar_t time[2]; /* modified: time */
uchar_t date[2]; /* modified: date */
uchar_t clus[2]; /* starting cluster */
uchar_t size[4]; /* size */
} DOS_DE;
typedef struct {
uchar_t seq; /* flags */
uchar_t name1[5][2]; /* 1st name area */
uchar_t attr; /* (see fat_de) */
uchar_t res; /* reserved */
uchar_t chk; /* checksum */
uchar_t name2[6][2]; /* 2nd name area */
uchar_t clus[2]; /* (see fat_de) */
uchar_t name3[2][2]; /* 3rd name area */
} DOS_XDE;
typedef union {
DOS_DE de; /* standard directory entry */
DOS_XDE xde; /* extended directory entry */
} DOS_DIR;
typedef struct {
struct open_file *fd; /* file descriptor */
uchar_t *secbuf; /* sector cache */
uchar_t *fatbuf; /* FAT cache buffer */
uint_t fatbuf_blknum; /* number of 128K block in FAT cache buffer */
uint_t links; /* active links to structure */
uint_t sshift; /* sector shift */
uint_t spc; /* sectors per cluster */
uint_t bsize; /* cluster size in bytes */
uint_t bshift; /* cluster conversion shift */
uint_t dshift; /* directory entries shift */
uint_t dirents; /* root directory entries */
uint_t spf; /* sectors per fat */
uint_t rdcl; /* root directory start cluster */
daddr_t lsnfat; /* start of fat */
daddr_t lsndir; /* start of root dir */
daddr_t lsndta; /* start of data area */
uint_t fatsz; /* FAT entry size */
uint_t xclus; /* maximum cluster number */
DOS_DE root;
} DOS_FS;
typedef struct {
DOS_FS *fs; /* associated filesystem */
DOS_DE de; /* directory entry */
uint_t offset; /* current offset */
uint_t c; /* last cluster read */
} DOS_FILE;
#endif /* !DOSIO_H */
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