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
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
/*
mkexfat.c (22.04.12)
FS creation engine.
Free exFAT implementation.
Copyright (C) 2011-2014 Andrew Nayenko
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.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <sys/types.h>
#include <unistd.h>
#include <inttypes.h>
#include <stdio.h>
#include <string.h>
#include "mkexfat.h"
static int check_size(off_t volume_size)
{
const struct fs_object** pp;
off_t position = 0;
for (pp = objects; *pp; pp++)
{
position = ROUND_UP(position, (*pp)->get_alignment());
position += (*pp)->get_size();
}
if (position > volume_size)
{
struct exfat_human_bytes vhb;
exfat_humanize_bytes(volume_size, &vhb);
exfat_error("too small device (%"PRIu64" %s)", vhb.value, vhb.unit);
return 1;
}
return 0;
}
static int erase_object(struct exfat_dev* dev, const void* block,
size_t block_size, off_t start, off_t size)
{
const off_t block_count = DIV_ROUND_UP(size, block_size);
off_t i;
if (exfat_seek(dev, start, SEEK_SET) == (off_t) -1)
{
exfat_error("seek to 0x%"PRIx64" failed", start);
return 1;
}
for (i = 0; i < size; i += block_size)
{
if (exfat_write(dev, block, MIN(size - i, block_size)) < 0)
{
exfat_error("failed to erase block %"PRIu64"/%"PRIu64
" at 0x%"PRIx64, i + 1, block_count, start);
return 1;
}
}
return 0;
}
static int erase(struct exfat_dev* dev)
{
const struct fs_object** pp;
off_t position = 0;
const size_t block_size = 1024 * 1024;
void* block = malloc(block_size);
if (block == NULL)
{
exfat_error("failed to allocate erase block of %zu bytes", block_size);
return 1;
}
memset(block, 0, block_size);
for (pp = objects; *pp; pp++)
{
position = ROUND_UP(position, (*pp)->get_alignment());
if (erase_object(dev, block, block_size, position,
(*pp)->get_size()) != 0)
{
free(block);
return 1;
}
position += (*pp)->get_size();
}
free(block);
return 0;
}
static int create(struct exfat_dev* dev)
{
const struct fs_object** pp;
off_t position = 0;
for (pp = objects; *pp; pp++)
{
position = ROUND_UP(position, (*pp)->get_alignment());
if (exfat_seek(dev, position, SEEK_SET) == (off_t) -1)
{
exfat_error("seek to 0x%"PRIx64" failed", position);
return 1;
}
if ((*pp)->write(dev) != 0)
return 1;
position += (*pp)->get_size();
}
return 0;
}
int mkfs(struct exfat_dev* dev, off_t volume_size)
{
if (check_size(volume_size) != 0)
return 1;
fputs("Creating... ", stdout);
fflush(stdout);
if (erase(dev) != 0)
return 1;
if (create(dev) != 0)
return 1;
puts("done.");
fputs("Flushing... ", stdout);
fflush(stdout);
if (exfat_fsync(dev) != 0)
return 1;
puts("done.");
return 0;
}
off_t get_position(const struct fs_object* object)
{
const struct fs_object** pp;
off_t position = 0;
for (pp = objects; *pp; pp++)
{
position = ROUND_UP(position, (*pp)->get_alignment());
if (*pp == object)
return position;
position += (*pp)->get_size();
}
exfat_bug("unknown object");
}
|
