1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
|
/*
* (C) Copyright 2002
* Stäubli Faverges - <www.staubli.com>
* Pierre AUBERT p.aubert@staubli.com
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <config.h>
#include <malloc.h>
#include "dos.h"
#include "fdos.h"
/*-----------------------------------------------------------------------------
* fill_fs -- Read info on file system
*-----------------------------------------------------------------------------
*/
static int fill_fs (BootSector_t *boot, Fs_t *fs)
{
fs -> fat_start = __le16_to_cpu (boot -> nrsvsect);
fs -> fat_len = __le16_to_cpu (boot -> fatlen);
fs -> nb_fat = boot -> nfat;
fs -> dir_start = fs -> fat_start + fs -> nb_fat * fs -> fat_len;
fs -> dir_len = __le16_to_cpu (boot -> dirents) * MDIR_SIZE / SZ_STD_SECTOR;
fs -> cluster_size = boot -> clsiz;
fs -> num_clus = (fs -> tot_sectors - fs -> dir_start - fs -> dir_len) / fs -> cluster_size;
return (0);
}
/*-----------------------------------------------------------------------------
* fs_init --
*-----------------------------------------------------------------------------
*/
int fs_init (Fs_t *fs)
{
BootSector_t *boot;
/* Initialize physical device */
if (dev_open () < 0) {
PRINTF ("Unable to initialize the fdc\n");
return (-1);
}
init_subdir ();
/* Allocate space for read the boot sector */
if ((boot = (BootSector_t *)malloc (sizeof (BootSector_t))) == NULL) {
PRINTF ("Unable to allocate space for boot sector\n");
return (-1);
}
/* read boot sector */
if (dev_read (boot, 0, 1)){
PRINTF ("Error during boot sector read\n");
free (boot);
return (-1);
}
/* we verify it'a a DOS diskette */
if (boot -> jump [0] != JUMP_0_1 && boot -> jump [0] != JUMP_0_2) {
PRINTF ("Not a DOS diskette\n");
free (boot);
return (-1);
}
if (boot -> descr < MEDIA_STD) {
/* We handle only recent medias (type F0) */
PRINTF ("unrecognized diskette type\n");
free (boot);
return (-1);
}
if (check_dev (boot, fs) < 0) {
PRINTF ("Bad diskette\n");
free (boot);
return (-1);
}
if (fill_fs (boot, fs) < 0) {
free (boot);
return (-1);
}
/* Read FAT */
if (read_fat (boot, fs) < 0) {
free (boot);
return (-1);
}
free (boot);
return (0);
}
|
