This file is indexed.

/usr/lib/perl5/DateTime/LeapSecond.pm is in libdatetime-perl 2:1.06-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
package DateTime::LeapSecond;
{
  $DateTime::LeapSecond::VERSION = '1.06';
}

use strict;
use warnings;

use vars qw( @RD @LEAP_SECONDS %RD_LENGTH );

use DateTime;

# Generates a Perl binary decision tree
sub _make_utx {
    my ( $beg, $end, $tab, $op ) = @_;
    my $step = int( ( $end - $beg ) / 2 );
    my $tmp;
    if ( $step <= 0 ) {
        $tmp = "${tab}return $LEAP_SECONDS[$beg + 1];\n";
        return $tmp;
    }
    $tmp = "${tab}if (\$val < " . $RD[ $beg + $step ] . ") {\n";
    $tmp .= _make_utx( $beg,         $beg + $step, $tab . "    ", $op );
    $tmp .= "${tab}}\n";
    $tmp .= "${tab}else {\n";
    $tmp .= _make_utx( $beg + $step, $end,         $tab . "    ", $op );
    $tmp .= "${tab}}\n";
    return $tmp;
}

# Process BEGIN data and write binary tree decision table
sub _init {
    my $value = -1;
    while (@_) {
        my ( $year, $mon, $mday, $leap_seconds )
            = ( shift, shift, shift, shift );

        # print "$year,$mon,$mday\n";

        my $utc_epoch
            = DateTime->_ymd2rd( $year, ( $mon =~ /Jan/i ? 1 : 7 ), $mday );

        $value++;
        push @LEAP_SECONDS, $value;
        push @RD,           $utc_epoch;

        $RD_LENGTH{ $utc_epoch - 1 } = $leap_seconds;

        # warn "$year,$mon,$mday = $utc_epoch +$value";
    }

    push @LEAP_SECONDS, ++$value;

    my $tmp;

    # write binary tree decision table

    $tmp = "sub leap_seconds {\n";
    $tmp .= "    my \$val = shift;\n";
    $tmp .= _make_utx( -1, 1 + $#RD, "    ", "+" );
    $tmp .= "}\n";

    # NOTE: uncomment the line below to see the code:
    #warn $tmp;

    eval $tmp;

}

sub extra_seconds {
    exists $RD_LENGTH{ $_[0] } ? $RD_LENGTH{ $_[0] } : 0;
}

sub day_length {
    exists $RD_LENGTH{ $_[0] } ? 86400 + $RD_LENGTH{ $_[0] } : 86400;
}

sub _initialize {

    # this table: ftp://62.161.69.5/pub/tai/publication/leaptab.txt
    # known accurate until (at least): 2005-12-31
    #
    # There are no leap seconds before 1972, because that's the
    # year this system was implemented.
    #
    # year month day number-of-leapseconds
    #
    _init(
        qw(
            1972  Jul. 1  +1
            1973  Jan. 1  +1
            1974  Jan. 1  +1
            1975  Jan. 1  +1
            1976  Jan. 1  +1
            1977  Jan. 1  +1
            1978  Jan. 1  +1
            1979  Jan. 1  +1
            1980  Jan. 1  +1
            1981  Jul. 1  +1
            1982  Jul. 1  +1
            1983  Jul. 1  +1
            1985  Jul. 1  +1
            1988  Jan. 1  +1
            1990  Jan. 1  +1
            1991  Jan. 1  +1
            1992  Jul. 1  +1
            1993  Jul. 1  +1
            1994  Jul. 1  +1
            1996  Jan. 1  +1
            1997  Jul. 1  +1
            1999  Jan. 1  +1
            2006  Jan. 1  +1
            2009  Jan. 1  +1
            2012  Jun. 1  +1
            )
    );
}

__PACKAGE__->_initialize();

1;
# ABSTRACT: leap seconds table and utilities

__END__

=pod

=head1 NAME

DateTime::LeapSecond - leap seconds table and utilities

=head1 VERSION

version 1.06

=head1 SYNOPSIS

  use DateTime;
  use DateTime::LeapSecond;

  print "Leap seconds between years 1990 and 2000 are ";
  print DateTime::Leapsecond::leap_seconds( $utc_rd_2000 ) -
        DateTime::Leapsecond::leap_seconds( $utc_rd_1990 );

=head1 DESCRIPTION

This module is used to calculate leap seconds for a given Rata Die
day. It is used when DateTime.pm cannot compile the XS version of
this code.

This library is known to be accurate for dates until December 2009.

There are no leap seconds before 1972, because that's the year this
system was implemented.

=over 4

=item * leap_seconds( $rd )

Returns the number of accumulated leap seconds for a given day,
in the range 0 .. 22.

=item * extra_seconds( $rd )

Returns the number of leap seconds for a given day,
in the range -2 .. 2.

=item * day_length( $rd )

Returns the number of seconds for a given day,
in the range 86398 .. 86402.

=back

=head1 SEE ALSO

E<lt>http://hpiers.obspm.fr/eop-pc/earthor/utc/leapsecond.htmlE<gt>

http://datetime.perl.org

=head1 AUTHOR

Dave Rolsky <autarch@urth.org>

=head1 COPYRIGHT AND LICENSE

This software is Copyright (c) 2013 by Dave Rolsky.

This is free software, licensed under:

  The Artistic License 2.0 (GPL Compatible)

=cut