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
151package resize_fat::directory; # $Id$
use diagnostics;
use strict;
use common;
use resize_fat::dir_entry;
use resize_fat::io;
my $format = "a8 a3 C C C S7 I";
my @fields = (
'name',
'extension',
'attributes',
'is_upper_case_name',
'creation_time_low', #- milliseconds
'creation_time_high',
'creation_date',
'access_date',
'first_cluster_high', #- for FAT32
'time',
'date',
'first_cluster',
'length',
);
my $psizeof_format = psizeof($format);
1;
sub entry_size { $psizeof_format }
#- call `f' for each entry of the directory
#- if f return true, then modification in the entry are taken back
sub traverse($$$) {
my ($directory, $curr_dir_name, $f) = @_;
for (my $i = 0;; $i++) {
my $raw = \substr($directory, $i * $psizeof_format, $psizeof_format);
#- empty entry means end of directory
$$raw =~ /^\0*$/ and return $directory;
my $entry; @$entry{@fields} = unpack $format, $$raw;
&$f($curr_dir_name, $entry)
and $$raw = pack $format, @$entry{@fields};
}
$directory;
}
sub traverse_all($$) {
my ($fs, $f) = @_;
my $traverse_all; $traverse_all = sub {
my ($curr_dir_name, $entry) = @_;
&$f($curr_dir_name, $entry);
resize_fat::dir_entry::is_directory($entry)
and traverse(resize_fat::io::read_file($fs, resize_fat::dir_entry::get_cluster($entry)), "$curr_dir_name/$entry->{name}", $traverse_all);
undef; #- no need to write back (cf traverse)
};
my $directory = $resize_fat::isFAT32 ?
resize_fat::io::read_file($fs, $fs->{fat32_root_dir_cluster}) :
resize_fat::io::read($fs, $fs->{root_dir_offset}, $fs->{root_dir_size});
traverse($directory, "", $traverse_all);
undef $traverse_all; #- circular reference is no good for perl's poor GC :(
}
#- function used by construct_dir_tree to translate the `cluster' fields in each
#- directory entry
sub remap($$) {
my ($_fs, $directory) = @_;
traverse($directory, "", \&resize_fat::dir_entry::remap);
}
|
