56e53cb8ef
A foolish consistency is the hobgoblin of little minds, adored by little statesmen and philosophers and divines. With consistency a great soul has simply nothing to do. -- Ralph Waldo Emerson
124 lines
4.7 KiB
C
124 lines
4.7 KiB
C
/*
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* Copyright (c) 1996, 1998 Robert Nordier
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
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* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef DOSIO_H
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#define DOSIO_H
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/*
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* DOS file attributes
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*/
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#define FA_RDONLY 001 /* read-only */
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#define FA_HIDDEN 002 /* hidden file */
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#define FA_SYSTEM 004 /* system file */
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#define FA_LABEL 010 /* volume label */
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#define FA_DIR 020 /* directory */
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#define FA_ARCH 040 /* archive (file modified) */
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#define FA_XDE 017 /* extended directory entry */
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#define FA_MASK 077 /* all attributes */
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/*
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* Macros to convert DOS-format 16-bit and 32-bit quantities
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*/
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#define cv2(p) ((uint16_t)(p)[0] | \
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((uint16_t)(p)[1] << 010))
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#define cv4(p) ((uint32_t)(p)[0] | \
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((uint32_t)(p)[1] << 010) | \
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((uint32_t)(p)[2] << 020) | \
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((uint32_t)(p)[3] << 030))
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/*
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* Directory, filesystem, and file structures.
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*/
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typedef struct {
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u_char x_case; /* case */
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u_char c_hsec; /* created: secs/100 */
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u_char c_time[2]; /* created: time */
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u_char c_date[2]; /* created: date */
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u_char a_date[2]; /* accessed: date */
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u_char h_clus[2]; /* clus[hi] */
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} DOS_DEX;
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typedef struct {
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u_char name[8]; /* name */
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u_char ext[3]; /* extension */
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u_char attr; /* attributes */
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DOS_DEX dex; /* VFAT/FAT32 only */
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u_char time[2]; /* modified: time */
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u_char date[2]; /* modified: date */
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u_char clus[2]; /* starting cluster */
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u_char size[4]; /* size */
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} DOS_DE;
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typedef struct {
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u_char seq; /* flags */
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u_char name1[5][2]; /* 1st name area */
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u_char attr; /* (see fat_de) */
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u_char res; /* reserved */
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u_char chk; /* checksum */
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u_char name2[6][2]; /* 2nd name area */
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u_char clus[2]; /* (see fat_de) */
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u_char name3[2][2]; /* 3rd name area */
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} DOS_XDE;
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typedef union {
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DOS_DE de; /* standard directory entry */
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DOS_XDE xde; /* extended directory entry */
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} DOS_DIR;
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typedef struct {
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struct open_file *fd; /* file descriptor */
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u_char *fatbuf; /* FAT cache buffer */
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u_int fatbuf_blknum; /* number of 128K block in FAT cache buffer */
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u_int links; /* active links to structure */
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u_int spc; /* sectors per cluster */
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u_int bsize; /* cluster size in bytes */
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u_int bshift; /* cluster conversion shift */
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u_int dirents; /* root directory entries */
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u_int spf; /* sectors per fat */
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u_int rdcl; /* root directory start cluster */
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u_int lsnfat; /* start of fat */
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u_int lsndir; /* start of root dir */
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u_int lsndta; /* start of data area */
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u_int fatsz; /* FAT entry size */
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u_int xclus; /* maximum cluster number */
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DOS_DE root;
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} DOS_FS;
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typedef struct {
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DOS_FS *fs; /* associated filesystem */
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DOS_DE de; /* directory entry */
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u_int offset; /* current offset */
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u_int c; /* last cluster read */
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} DOS_FILE;
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#endif /* !DOSIO_H */
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