pm/MGATools/iso.pm

package MGATools::iso;

use strict;
use Digest::MD5;

require Exporter;
use URPM;
our @ISA    = qw(Exporter);
our @EXPORT = qw(include_md5);
our ( $INFO_OFFSET, $SIZE_OFFSET, $SKIP );
$INFO_OFFSET = 883;
$SIZE_OFFSET = 84;
$SKIP        = 15;

=head1 NAME

Mageia iso tools

=head1 SYNOPSYS

    require MGATools::iso;

=head1 DESCRIPTION

<MGATools::iso> includes Mageia iso tools.

=head1 SEE ALSO

mkcd

=head1 COPYRIGHT

Copyright (C) 2000,2001,2002,2003,2004 Mandriva <warly@mandriva.com>

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, 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.

=head1 CREDITS

md5 code highly inspired from Redhat anaconda md5 in ISO code

=cut

# function copied from Mkcd::Tools
# TODO must add some check of maximum authorized size
sub include_md5 {
    my ( $iso, $write, $verbose ) = @_;
    my $ISO;
    if ($write) {
        open $ISO, "+<$iso"
          or return "ERROR include_md5: unable to open $iso ($!)\n";
    }
    else {
        open $ISO, $iso
          or return "ERROR include_md5: unable to open $iso ($!)\n";
    }
    binmode $ISO;
    my $offset = 16 * 2048;

    # blank header
    seek $ISO, $offset, 0;
    my ( $buf, $msg );
    while (1) {
        read $ISO, $buf, 2048;
        my $c = ord $buf;
        last if $c == 1;
        return "ERROR include_md5: could not find primary volume descriptor\n"
          if $c == 255;
        $offset += 2048;
    }
    my $size =
      ( ( ord substr $buf, $SIZE_OFFSET, 1 ) * 0x1000000 +
          ( ord substr $buf, $SIZE_OFFSET + 1, 1 ) * 0x10000 +
          ( ord substr $buf, $SIZE_OFFSET + 2, 1 ) * 0x100 +
          ( ord substr $buf, $SIZE_OFFSET + 3, 1 ) ) * 2048;
    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( $buf, 574, 128 )
      );
    print
"include_md5:\nSystem: \t$system\nVolume: \t$volume\nPublisher: \t$publisher\nData preparer: \t$prep\nApplication: \t$app\nISO size: \t$size\n"
      if $verbose;
    seek $ISO, $offset + $INFO_OFFSET, 0;
    read $ISO, $buf, 512;
    my ($md5sum) = $buf =~ /.md5 = (\S+)/;
    $msg .= "include_md5: previous data $buf\n";
    seek $ISO, 0, 0;
    my $md5 = new Digest::MD5;
    my $read = read $ISO, $buf, $offset + $INFO_OFFSET;
    $md5->add($buf);
    seek $ISO, 512, 1;
    $read += 512;
    $| = 1;
    my $val = int $size / 2048 / 100;
    $verbose and print "\rReading: 0 %";
    my ( $i, $j );

  # skip last $SKIP bytes that sometimes are not correctly burned by some drives
    my $n = 1;
    while ( $n && $read < $size - $SKIP * 2048 ) {
        $n = read $ISO, $buf, 2048;
        print "\rReading: ", $j++, " %" if ( $verbose && !( $i++ % $val ) );
        $md5->add($buf);
        $read += $n;
    }
    print "\n";
    my $digest = $md5->hexdigest;
    $msg .= "include_md5: computed md5 $digest\n";
    my $res = $md5sum eq $digest;
    if ($md5sum) {
        $msg .= "include_md5: previous md5 $md5sum\ninclude_md5: md5sum check ";
        $msg .= $res ? "OK\n" : "FAILED\n";
    }
    print $msg if $verbose;
    $write or return $res;
    seek $ISO, $offset + $INFO_OFFSET, 0;
    my $str = substr "$volume.md5 = $digest", 0, 512;
    my $l = length $str;
    print $ISO ( $l > 512 ? substr $str, -1, 512 : $str . ' ' x ( 512 - $l ) );
    close $ISO;
}

1

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	# function copied from Mkcd::Tools
56	# TODO must add some check of maximum authorized size
57	sub include_md5 {
58	my ( $iso, $write, $verbose ) = @_;
59	my $ISO;
60	if ($write) {
61	open $ISO, "+<$iso"
62	or return "ERROR include_md5: unable to open $iso ($!)\n";
63	}
64	else {
65	open $ISO, $iso
66	or return "ERROR include_md5: unable to open $iso ($!)\n";
67	}
68	binmode $ISO;
69	my $offset = 16 * 2048;
70
71	# blank header
72	seek $ISO, $offset, 0;
73	my ( $buf, $msg );
74	while (1) {
75	read $ISO, $buf, 2048;
76	my $c = ord $buf;
77	last if $c == 1;
78	return "ERROR include_md5: could not find primary volume descriptor\n"
79	if $c == 255;
80	$offset += 2048;
81	}
82	my $size =
83	( ( ord substr $buf, $SIZE_OFFSET, 1 ) * 0x1000000 +
84	( ord substr $buf, $SIZE_OFFSET + 1, 1 ) * 0x10000 +
85	( ord substr $buf, $SIZE_OFFSET + 2, 1 ) * 0x100 +
86	( ord substr $buf, $SIZE_OFFSET + 3, 1 ) ) * 2048;
87	my ( $system, $volume, $publisher, $prep, $app ) =
88	map { $a = $_; $a =~ s/^\s//; $a =~ s/\s$//; $a } (
89	substr( $buf, 8, 22 ),
90	substr( $buf, 30, 40 ),
91	substr( $buf, 318, 128 ),
92	substr( $buf, 446, 32 ),
93	substr( $buf, 574, 128 )
94	);
95	print
96	"include_md5:\nSystem: \t$system\nVolume: \t$volume\nPublisher: \t$publisher\nData preparer: \t$prep\nApplication: \t$app\nISO size: \t$size\n"
97	if $verbose;
98	seek $ISO, $offset + $INFO_OFFSET, 0;
99	read $ISO, $buf, 512;
100	my ($md5sum) = $buf =~ /.md5 = (\S+)/;
101	$msg .= "include_md5: previous data $buf\n";
102	seek $ISO, 0, 0;
103	my $md5 = new Digest::MD5;
104	my $read = read $ISO, $buf, $offset + $INFO_OFFSET;
105	$md5->add($buf);
106	seek $ISO, 512, 1;
107	$read += 512;
108	$\| = 1;
109	my $val = int $size / 2048 / 100;
110	$verbose and print "\rReading: 0 %";
111	my ( $i, $j );
112
113	# skip last $SKIP bytes that sometimes are not correctly burned by some drives
114	my $n = 1;
115	while ( $n && $read < $size - $SKIP * 2048 ) {
116	$n = read $ISO, $buf, 2048;
117	print "\rReading: ", $j++, " %" if ( $verbose && !( $i++ % $val ) );
118	$md5->add($buf);
119	$read += $n;
120	}
121	print "\n";
122	my $digest = $md5->hexdigest;
123	$msg .= "include_md5: computed md5 $digest\n";
124	my $res = $md5sum eq $digest;
125	if ($md5sum) {
126	$msg .= "include_md5: previous md5 $md5sum\ninclude_md5: md5sum check ";
127	$msg .= $res ? "OK\n" : "FAILED\n";
128	}
129	print $msg if $verbose;
130	$write or return $res;
131	seek $ISO, $offset + $INFO_OFFSET, 0;
132	my $str = substr "$volume.md5 = $digest", 0, 512;
133	my $l = length $str;
134	print $ISO ( $l > 512 ? substr $str, -1, 512 : $str . ' ' x ( 512 - $l ) );
135	close $ISO;
136	}
137
138	1
139