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package Archive::Cpio::OldBinary; |
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use Archive::Cpio::Common; |
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1201
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my $TRAILER = 'TRAILER!!!'; |
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my $BLOCK_SIZE = 512; |
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my @HEADER = qw( |
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magic |
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dev |
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ino |
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mode |
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uid |
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gid |
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nlink |
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rdev |
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mtime_high |
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mtime_low |
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namesize |
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datasize_high |
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datasize_low |
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); |
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sub new { |
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my ($class, $magic) = @_; |
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0
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bless { magic => unpack('v', $magic) }, $class; |
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} |
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sub read_one { |
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my ($o, $FHwp) = @_; |
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my $entry = read_one_header($o, $FHwp); |
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$entry->{name} = $FHwp->read($entry->{namesize}); |
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$entry->{name} =~ s/\0$//; |
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$entry->{name} ne $TRAILER or return; |
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$FHwp->read(padding(2, $entry->{namesize})); |
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$entry->{data} = $FHwp->read($entry->{datasize}); |
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$FHwp->read(padding(2, $entry->{datasize})); |
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0
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cleanup_entry($entry); |
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$entry; |
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} |
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sub read_one_header { |
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my ($o, $FHwp) = @_; |
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my %h; |
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my @vals = unpack('v*', $FHwp->read(2 * @HEADER)); |
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foreach my $field (@HEADER) { |
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$h{$field} = shift @vals; |
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} |
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foreach ('mtime', 'datasize') { |
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$h{$_} = $h{$_ . '_high'} * 0x10000 + $h{$_ . '_low'}; |
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} |
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0
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$h{magic} == $o->{magic} or die "bad magic ($h{magic} vs $o->{MAGIC})\n"; |
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\%h; |
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} |
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sub write_one { |
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my ($o, $F, $entry) = @_; |
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$entry->{magic} = $o->{magic}; |
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$entry->{namesize} = length($entry->{name}) + 1; |
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$entry->{datasize} = length($entry->{data}); |
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foreach ('mtime', 'datasize') { |
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$entry->{$_ . '_high'} = int($entry->{$_} / 0x10000); |
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$entry->{$_ . '_low'} = $entry->{$_} % 0x10000; |
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} |
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0
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write_or_die($F, pack_header($entry) . |
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$entry->{name} . "\0" . |
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"\0" x padding(2, $entry->{namesize})); |
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write_or_die($F, $entry->{data}); |
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write_or_die($F, "\0" x padding(2, $entry->{datasize})); |
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0
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cleanup_entry($entry); |
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} |
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85
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sub write_trailer { |
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my ($o, $F) = @_; |
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write_one($o, $F, { name => $TRAILER, data => '', nlink => 1 }); |
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write_or_die($F, "\0" x padding($BLOCK_SIZE, tell($F))); |
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} |
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sub cleanup_entry { |
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my ($entry) = @_; |
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95
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foreach ('datasize', 'namesize', 'magic') { |
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delete $entry->{$_}; |
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} |
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0
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foreach (keys %$entry) { |
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/_low$|_high$/ and delete $entry->{$_}; |
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} |
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} |
102
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103
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sub pack_header { |
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my ($h) = @_; |
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pack('v*', map { $h->{$_} || 0 } @HEADER); |
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106
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} |
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108
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1; |