xref: /titanic_51/usr/src/boot/lib/libstand/dosfs.h (revision 8c8024e20d698e68ca49199a9508024e935b6659)
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 
29 #ifndef DOSIO_H
30 #define DOSIO_H
31 
32 /*
33  * DOS file attributes
34  */
35 
36 #define FA_RDONLY  001          /* read-only */
37 #define FA_HIDDEN  002          /* hidden file */
38 #define FA_SYSTEM  004          /* system file */
39 #define FA_LABEL   010          /* volume label */
40 #define FA_DIR     020          /* directory */
41 #define FA_ARCH    040          /* archive (file modified) */
42 #define FA_XDE     017          /* extended directory entry */
43 #define FA_MASK    077          /* all attributes */
44 
45 /*
46  * Macros to convert DOS-format 16-bit and 32-bit quantities
47  */
48 
49 #define cv2(p)  ((u_int16_t)(p)[0] |         \
50                 ((u_int16_t)(p)[1] << 010))
51 #define cv4(p)  ((u_int32_t)(p)[0] |          \
52                 ((u_int32_t)(p)[1] << 010) |  \
53                 ((u_int32_t)(p)[2] << 020) |  \
54                 ((u_int32_t)(p)[3] << 030))
55 
56 /*
57  * Directory, filesystem, and file structures.
58  */
59 
60 typedef struct {
61     u_char x_case;              /* case */
62     u_char c_hsec;              /* created: secs/100 */
63     u_char c_time[2];           /* created: time */
64     u_char c_date[2];           /* created: date */
65     u_char a_date[2];           /* accessed: date */
66     u_char h_clus[2];           /* clus[hi] */
67 } DOS_DEX;
68 
69 typedef struct {
70     u_char name[8];             /* name */
71     u_char ext[3];              /* extension */
72     u_char attr;                /* attributes */
73     DOS_DEX dex;                /* VFAT/FAT32 only */
74     u_char time[2];             /* modified: time */
75     u_char date[2];             /* modified: date */
76     u_char clus[2];             /* starting cluster */
77     u_char size[4];             /* size */
78 } DOS_DE;
79 
80 typedef struct {
81     u_char seq;                 /* flags */
82     u_char name1[5][2];         /* 1st name area */
83     u_char attr;                /* (see fat_de) */
84     u_char res;                 /* reserved */
85     u_char chk;                 /* checksum */
86     u_char name2[6][2];         /* 2nd name area */
87     u_char clus[2];             /* (see fat_de) */
88     u_char name3[2][2];         /* 3rd name area */
89 } DOS_XDE;
90 
91 typedef union {
92     DOS_DE de;                  /* standard directory entry */
93     DOS_XDE xde;                /* extended directory entry */
94 } DOS_DIR;
95 
96 typedef struct {
97     struct open_file *fd;       /* file descriptor */
98     u_char *fatbuf;		/* FAT cache buffer */
99     u_int fatbuf_blknum;	/* number of 128K block in FAT cache buffer */
100     u_int links;                /* active links to structure */
101     u_int spc;                  /* sectors per cluster */
102     u_int bsize;                /* cluster size in bytes */
103     u_int bshift;               /* cluster conversion shift */
104     u_int dirents;              /* root directory entries */
105     u_int spf;                  /* sectors per fat */
106     u_int rdcl;                 /* root directory start cluster */
107     u_int lsnfat;               /* start of fat */
108     u_int lsndir;               /* start of root dir */
109     u_int lsndta;               /* start of data area */
110     u_int fatsz;                /* FAT entry size */
111     u_int xclus;                /* maximum cluster number */
112     DOS_DE root;
113 } DOS_FS;
114 
115 typedef struct {
116     DOS_FS *fs;                 /* associated filesystem */
117     DOS_DE de;                  /* directory entry */
118     u_int offset;               /* current offset */
119     u_int c;                    /* last cluster read */
120 } DOS_FILE;
121 
122 #endif  /* !DOSIO_H */
123