119 lines
4.3 KiB
C
119 lines
4.3 KiB
C
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/*
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* Copyright (c) 1996 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 the
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* documentation and/or other materials provided with the 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 ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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 0x01 /* read-only */
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#define FA_HIDDEN 0x02 /* hidden file */
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#define FA_SYSTEM 0x04 /* system file */
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#define FA_LABEL 0x08 /* volume label */
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#define FA_DIR 0x10 /* directory */
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#define FA_ARCH 0x20 /* archive (file modified) */
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/*
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* Error number to overload if filesystem errors are detected during
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* routine processing
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*/
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#define EBADFS EINVAL
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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) ((u_short)(p)[0] | \
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((u_short)(p)[1] << 010))
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#define cv4(p) ((u_long)(p)[0] | \
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((u_long)(p)[1] << 010) | \
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((u_long)(p)[2] << 020) | \
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((u_long)(p)[3] << 030))
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/*
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* DOS directory structure
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*/
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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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u_char reserved[10]; /* reserved */
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u_char time[2]; /* time */
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u_char date[2]; /* date */
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u_char clus[2]; /* starting cluster */
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u_char size[4]; /* file size */
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} DOS_DE;
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typedef struct {
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u_char *fat; /* FAT */
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u_long volid; /* volume id */
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u_long lsnfat; /* logical sector number: fat */
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u_long lsndir; /* logical sector number: dir */
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u_long lsndta; /* logical sector number: data area */
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short fd; /* file descriptor */
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short fat12; /* 12-bit FAT entries */
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u_short spf; /* sectors per fat */
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u_short dirents; /* root directory entries */
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u_short spc; /* sectors per cluster */
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u_short xclus; /* maximum cluster number */
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u_short bsize; /* cluster size in bytes */
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u_short bshift; /* cluster conversion shift */
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u_short links; /* active links to structure */
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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_long offset; /* current offset */
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u_short c; /* last cluster read */
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} DOS_FILE;
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/*
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* The following variable can be set to the address of an error-handling
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* routine which will be invoked when a read() returns EIO. The handler
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* should return 1 to retry the read, otherwise 0.
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*/
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extern int (*dos_ioerr)(int op);
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int dos_mount(DOS_FS *fs, const char *devname);
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int dos_unmount(DOS_FS *fs);
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u_long dos_free(DOS_FS *fs);
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FILE *dos_open(DOS_FS *fs, const char *path);
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int dos_close(void *v);
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fpos_t dos_seek(void *v, fpos_t offset, int whence);
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int dos_read(void *v, char *buf, int nbytes);
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int dos_stat(DOS_FS *fs, const char *path, struct stat *sb);
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int dos_fstat(DOS_FILE *f, struct stat *sb);
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void dos_cvtime(time_t *timer, u_short ddate, u_short dtime);
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#endif /* !DOSIO_H */
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