diff options
| -rw-r--r-- | pm/MGATools/iso.pm | 87 |
1 files changed, 36 insertions, 51 deletions
diff --git a/pm/MGATools/iso.pm b/pm/MGATools/iso.pm index 24d91b4..8fe13e5 100644 --- a/pm/MGATools/iso.pm +++ b/pm/MGATools/iso.pm @@ -5,12 +5,12 @@ use Digest::MD5; require Exporter; use URPM; -our @ISA = qw(Exporter); +our @ISA = qw(Exporter);; our @EXPORT = qw(include_md5); -our ( $INFO_OFFSET, $SIZE_OFFSET, $SKIP ); +our ($INFO_OFFSET, $SIZE_OFFSET, $SKIP); $INFO_OFFSET = 883; $SIZE_OFFSET = 84; -$SKIP = 15; +$SKIP = 15; =head1 NAME @@ -52,51 +52,37 @@ 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 $ISO; + my ($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"; + 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; - + my $offset = 16*2048; # blank header seek $ISO, $offset, 0; - my ( $buf, $msg ); + my ($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; + 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; + 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; + read $ISO, $buf,512; my ($md5sum) = $buf =~ /.md5 = (\S+)/; $msg .= "include_md5: previous data $buf\n"; seek $ISO, 0, 0; @@ -105,34 +91,33 @@ sub include_md5 { $md5->add($buf); seek $ISO, 512, 1; $read += 512; - $| = 1; - my $val = int $size / 2048 / 100; + $|=1; + my $val = int $size/2048/100; $verbose and print "\rReading: 0 %"; - my ( $i, $j ); - - # skip last $SKIP bytes that sometimes are not correctly burned by some drives + my ($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 += $n; + while ($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"; + $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; + print $ISO ($l > 512 ? substr $str, -1, 512 : $str . ' ' x (512 - $l)); + close $ISO } 1 |