/[soft]/mgatools/trunk/pm/MGATools/iso.pm
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Contents of /mgatools/trunk/pm/MGATools/iso.pm

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Revision 6053 - (show annotations) (download)
Tue Sep 25 12:18:24 2012 UTC (12 years ago) by kharec
File size: 3760 byte(s)
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1 package MGATools::iso;
2
3 use strict;
4 use Digest::MD5;
5
6 require Exporter;
7 use URPM;
8 our @ISA = qw(Exporter);;
9 our @EXPORT = qw(include_md5);
10 our ($INFO_OFFSET, $SIZE_OFFSET, $SKIP);
11 $INFO_OFFSET = 883;
12 $SIZE_OFFSET = 84;
13 $SKIP = 15;
14
15 =head1 NAME
16
17 Mageia iso tools
18
19 =head1 SYNOPSYS
20
21 require MGATools::iso;
22
23 =head1 DESCRIPTION
24
25 <MGATools::iso> includes Mageia iso tools.
26
27 =head1 SEE ALSO
28
29 mkcd
30
31 =head1 COPYRIGHT
32
33 Copyright (C) 2000,2001,2002,2003,2004 Mandriva <warly@mandriva.com>
34
35 This program is free software; you can redistribute it and/or modify
36 it under the terms of the GNU General Public License as published by
37 the Free Software Foundation; either version 2, or (at your option)
38 any later version.
39
40 This program is distributed in the hope that it will be useful,
41 but WITHOUT ANY WARRANTY; without even the implied warranty of
42 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
43 GNU General Public License for more details.
44
45 You should have received a copy of the GNU General Public License
46 along with this program; if not, write to the Free Software
47 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
48
49 =head1 CREDITS
50
51 md5 code highly inspired from Redhat anaconda md5 in ISO code
52
53 =cut
54
55
56 # function copied from Mkcd::Tools
57 # TODO must add some check of maximum authorized size
58 sub include_md5 {
59 my ($iso, $write, $verbose) = @_;
60 my $ISO;
61 if ($write) {
62 open $ISO, "+<$iso" or return "ERROR include_md5: unable to open $iso ($!)\n";
63 } else {
64 open $ISO, $iso or return "ERROR include_md5: unable to open $iso ($!)\n";
65 }
66 binmode $ISO;
67 my $offset = 16*2048;
68 # blank header
69 seek $ISO, $offset, 0;
70 my ($buf, $msg);
71 while (1) {
72 read $ISO,$buf,2048;
73 my $c = ord $buf;
74 last if $c == 1;
75 return "ERROR include_md5: could not find primary volume descriptor\n" if $c == 255;
76 $offset += 2048
77 }
78 my $size = ((ord substr $buf, $SIZE_OFFSET, 1) * 0x1000000 +
79 (ord substr $buf, $SIZE_OFFSET + 1, 1) * 0x10000 +
80 (ord substr $buf, $SIZE_OFFSET + 2, 1) * 0x100 +
81 (ord substr $buf, $SIZE_OFFSET + 3, 1)) * 2048;
82 my ($system, $volume, $publisher, $prep, $app) = map { $a = $_ ; $a =~ s/^\s*//; $a =~ s/\s*$//; $a } (substr($buf, 8, 22), substr($buf, 30, 40), substr($buf, 318, 128), substr($buf, 446, 32), substr($buf, 574, 128));
83 print "include_md5:\nSystem: \t$system\nVolume: \t$volume\nPublisher: \t$publisher\nData preparer: \t$prep\nApplication: \t$app\nISO size: \t$size\n" if $verbose;
84 seek $ISO, $offset + $INFO_OFFSET, 0;
85 read $ISO, $buf,512;
86 my ($md5sum) = $buf =~ /.md5 = (\S+)/;
87 $msg .= "include_md5: previous data $buf\n";
88 seek $ISO, 0, 0;
89 my $md5 = new Digest::MD5;
90 my $read = read $ISO, $buf, $offset + $INFO_OFFSET;
91 $md5->add($buf);
92 seek $ISO, 512, 1;
93 $read += 512;
94 $|=1;
95 my $val = int $size/2048/100;
96 $verbose and print "\rReading: 0 %";
97 my ($i, $j);
98 # skip last $SKIP bytes that sometimes are not correctly burned by some drives
99 my $n = 1;
100 while ($n && $read < $size - $SKIP * 2048) {
101 $n = read $ISO, $buf,2048;
102 print "\rReading: ", $j++, " %" if ($verbose && !($i++ % $val));
103 $md5->add($buf);
104 $read += $n;
105 }
106 print "\n";
107 my $digest = $md5->hexdigest;
108 $msg .= "include_md5: computed md5 $digest\n";
109 my $res = $md5sum eq $digest;
110 if ($md5sum) {
111 $msg .= "include_md5: previous md5 $md5sum\ninclude_md5: md5sum check ";
112 $msg .= $res ? "OK\n" : "FAILED\n"
113 }
114 print $msg if $verbose;
115 $write or return $res;
116 seek $ISO, $offset + $INFO_OFFSET, 0;
117 my $str = substr "$volume.md5 = $digest", 0, 512;
118 my $l = length $str;
119 print $ISO ($l > 512 ? substr $str, -1, 512 : $str . ' ' x (512 - $l));
120 close $ISO
121 }
122
123 1
124

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