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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;
}
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