lib/libstand/dosfs.h

   1 /*
   2  * Copyright (c) 1996, 1998 Robert Nordier
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in
  12  *    the documentation and/or other materials provided with the
  13  *    distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS
  16  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY
  19  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  21  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  22  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  23  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  25  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #ifndef DOSIO_H
  29 #define DOSIO_H
  30
  31 /*
  32  * DOS file attributes
  33  */
  34
  35 #define FA_RDONLY  001          /* read-only */
  36 #define FA_HIDDEN  002          /* hidden file */
  37 #define FA_SYSTEM  004          /* system file */
  38 #define FA_LABEL   010          /* volume label */
  39 #define FA_DIR     020          /* directory */
  40 #define FA_ARCH    040          /* archive (file modified) */
  41 #define FA_XDE     017          /* extended directory entry */
  42 #define FA_MASK    077          /* all attributes */
  43
  44 /*
  45  * Macros to convert DOS-format 16-bit and 32-bit quantities
  46  */
  47
  48 #define cv2(p)  ((u_int16_t)(p)[0] |         \
  49                 ((u_int16_t)(p)[1] << 010))
  50 #define cv4(p)  ((u_int32_t)(p)[0] |          \
  51                 ((u_int32_t)(p)[1] << 010) |  \
  52                 ((u_int32_t)(p)[2] << 020) |  \
  53                 ((u_int32_t)(p)[3] << 030))
  54
  55 /*
  56  * Directory, filesystem, and file structures.
  57  */
  58
  59 typedef struct {
  60     u_char x_case;              /* case */
  61     u_char c_hsec;              /* created: secs/100 */
  62     u_char c_time[2];           /* created: time */
  63     u_char c_date[2];           /* created: date */
  64     u_char a_date[2];           /* accessed: date */
  65     u_char h_clus[2];           /* clus[hi] */
  66 } DOS_DEX;
  67
  68 typedef struct {
  69     u_char name[8];             /* name */
  70     u_char ext[3];              /* extension */
  71     u_char attr;                /* attributes */
  72     DOS_DEX dex;                /* VFAT/FAT32 only */
  73     u_char time[2];             /* modified: time */
  74     u_char date[2];             /* modified: date */
  75     u_char clus[2];             /* starting cluster */
  76     u_char size[4];             /* size */
  77 } DOS_DE;
  78
  79 typedef struct {
  80     u_char seq;                 /* flags */
  81     u_char name1[5][2];         /* 1st name area */
  82     u_char attr;                /* (see fat_de) */
  83     u_char res;                 /* reserved */
  84     u_char chk;                 /* checksum */
  85     u_char name2[6][2];         /* 2nd name area */
  86     u_char clus[2];             /* (see fat_de) */
  87     u_char name3[2][2];         /* 3rd name area */
  88 } DOS_XDE;
  89
  90 typedef union {
  91     DOS_DE de;                  /* standard directory entry */
  92     DOS_XDE xde;                /* extended directory entry */
  93 } DOS_DIR;
  94
  95 typedef struct {
  96     struct open_file *fd;       /* file descriptor */
  97     u_char *buf;                /* buffer */
  98     u_int bufsec;               /* buffered sector */
  99     u_int links;                /* active links to structure */
 100     u_int spc;                  /* sectors per cluster */
 101     u_int bsize;                /* cluster size in bytes */
 102     u_int bshift;               /* cluster conversion shift */
 103     u_int dirents;              /* root directory entries */
 104     u_int spf;                  /* sectors per fat */
 105     u_int rdcl;                 /* root directory start cluster */
 106     u_int lsnfat;               /* start of fat */
 107     u_int lsndir;               /* start of root dir */
 108     u_int lsndta;               /* start of data area */
 109     u_int fatsz;                /* FAT entry size */
 110     u_int xclus;                /* maximum cluster number */
 111     DOS_DE root;
 112 } DOS_FS;
 113
 114 typedef struct {
 115     DOS_FS *fs;                 /* associated filesystem */
 116     DOS_DE de;                  /* directory entry */
 117     u_int offset;               /* current offset */
 118     u_int c;                    /* last cluster read */
 119 } DOS_FILE;
 120
 121 #endif  /* !DOSIO_H */