This file is indexed.

/usr/share/perl5/Dpkg/Version.pm is in libdpkg-perl 1.17.5ubuntu5.

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
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
# Copyright © Colin Watson <cjwatson@debian.org>
# Copyright © Ian Jackson <iwj@debian.org>
# Copyright © 2007 Don Armstrong <don@donarmstrong.com>.
# Copyright © 2009 Raphaël Hertzog <hertzog@debian.org>
#
# 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 of the License, 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, see <https://www.gnu.org/licenses/>.

package Dpkg::Version;

use strict;
use warnings;

our $VERSION = '1.01';

use Dpkg::ErrorHandling;
use Dpkg::Gettext;

use Carp;
use Exporter qw(import);
our @EXPORT = qw(version_compare version_compare_relation
                 version_normalize_relation version_compare_string
                 version_compare_part version_split_digits version_check
                 REL_LT REL_LE REL_EQ REL_GE REL_GT);

use constant {
    REL_LT => '<<',
    REL_LE => '<=',
    REL_EQ => '=',
    REL_GE => '>=',
    REL_GT => '>>',
};

use overload
    '<=>' => \&comparison,
    'cmp' => \&comparison,
    '""'  => sub { return $_[0]->as_string(); },
    'bool' => sub { return $_[0]->as_string() if $_[0]->is_valid(); },
    'fallback' => 1;

=encoding utf8

=head1 NAME

Dpkg::Version - handling and comparing dpkg-style version numbers

=head1 DESCRIPTION

The Dpkg::Version module provides pure-Perl routines to compare
dpkg-style version numbers (as used in Debian packages) and also
an object oriented interface overriding perl operators
to do the right thing when you compare Dpkg::Version object between
them.

=head1 OBJECT INTERFACE

=over 4

=item my $v = Dpkg::Version->new($version, %opts)

Create a new Dpkg::Version object corresponding to the version indicated in
the string (scalar) $version. By default it will accepts any string
and consider it as a valid version. If you pass the option "check => 1",
it will return undef if the version is invalid (see version_check for
details).

You can always call $v->is_valid() later on to verify that the version is
valid.

=cut

sub new {
    my ($this, $ver, %opts) = @_;
    my $class = ref($this) || $this;
    $ver = "$ver" if ref($ver); # Try to stringify objects

    if ($opts{check}) {
	return unless version_check($ver);
    }

    my $self = {};
    if ($ver =~ /^([^:]*):(.+)$/) {
	$self->{epoch} = $1;
	$ver = $2;
    } else {
	$self->{epoch} = 0;
	$self->{no_epoch} = 1;
    }
    if ($ver =~ /(.*)-(.*)$/) {
	$self->{version} = $1;
	$self->{revision} = $2;
    } else {
	$self->{version} = $ver;
	$self->{revision} = 0;
	$self->{no_revision} = 1;
    }

    return bless $self, $class;
}

=item boolean evaluation

When the Dpkg::Version object is used in a boolean evaluation (for example
in "if ($v)" or "$v || 'default'") it returns its string representation
if the version stored is valid ($v->is_valid()) and undef otherwise.

=item $v->is_valid()

Returns true if the version is valid, false otherwise.

=cut

sub is_valid {
    my ($self) = @_;
    return scalar version_check($self);
}

=item $v->epoch(), $v->version(), $v->revision()

Returns the corresponding part of the full version string.

=cut

sub epoch {
    my $self = shift;
    return $self->{epoch};
}

sub version {
    my $self = shift;
    return $self->{version};
}

sub revision {
    my $self = shift;
    return $self->{revision};
}

=item $v->is_native()

Returns true if the version is native, false if it has a revision.

=cut

sub is_native {
    my $self = shift;
    return $self->{no_revision};
}

=item $v1 <=> $v2, $v1 < $v2, $v1 <= $v2, $v1 > $v2, $v1 >= $v2

Numerical comparison of various versions numbers. One of the two operands
needs to be a Dpkg::Version, the other one can be anything provided that
its string representation is a version number.

=cut

sub comparison {
    my ($a, $b, $inverted) = @_;
    if (not ref($b) or not $b->isa('Dpkg::Version')) {
        $b = Dpkg::Version->new($b);
    }
    ($a, $b) = ($b, $a) if $inverted;
    my $r = version_compare_part($a->epoch(), $b->epoch());
    return $r if $r;
    $r = version_compare_part($a->version(), $b->version());
    return $r if $r;
    return version_compare_part($a->revision(), $b->revision());
}

=item "$v", $v->as_string(), $v->as_string(%options)

Accepts an optional option hash reference, affecting the string conversion.

Options:

=over 8

=item omit_epoch (defaults to 0)

Omit the epoch, if present, in the output string.

=item omit_revision (defaults to 0)

Omit the revision, if present, in the output string.

=back

Returns the string representation of the version number.

=cut

sub as_string {
    my ($self, %opts) = @_;
    my $no_epoch = $opts{omit_epoch} || $self->{no_epoch};
    my $no_revision = $opts{omit_revision} || $self->{no_revision};

    my $str = '';
    $str .= $self->{epoch} . ':' unless $no_epoch;
    $str .= $self->{version};
    $str .= '-' . $self->{revision} unless $no_revision;
    return $str;
}

=back

=head1 FUNCTIONS

All the functions are exported by default.

=over 4

=item version_compare($a, $b)

Returns -1 if $a is earlier than $b, 0 if they are equal and 1 if $a
is later than $b.

If $a or $b are not valid version numbers, it dies with an error.

=cut

sub version_compare($$) {
    my ($a, $b) = @_;
    my $va = Dpkg::Version->new($a, check => 1);
    defined($va) || error(_g('%s is not a valid version'), "$a");
    my $vb = Dpkg::Version->new($b, check => 1);
    defined($vb) || error(_g('%s is not a valid version'), "$b");
    return $va <=> $vb;
}

=item version_compare_relation($a, $rel, $b)

Returns the result (0 or 1) of the given comparison operation. This
function is implemented on top of version_compare().

Allowed values for $rel are the exported constants REL_GT, REL_GE,
REL_EQ, REL_LE, REL_LT. Use version_normalize_relation() if you
have an input string containing the operator.

=cut

sub version_compare_relation($$$) {
    my ($a, $op, $b) = @_;
    my $res = version_compare($a, $b);

    if ($op eq REL_GT) {
	return $res > 0;
    } elsif ($op eq REL_GE) {
	return $res >= 0;
    } elsif ($op eq REL_EQ) {
	return $res == 0;
    } elsif ($op eq REL_LE) {
	return $res <= 0;
    } elsif ($op eq REL_LT) {
	return $res < 0;
    } else {
	croak "unsupported relation for version_compare_relation(): '$op'";
    }
}

=item my $rel = version_normalize_relation($rel_string)

Returns the normalized constant of the relation $rel (a value
among REL_GT, REL_GE, REL_EQ, REL_LE and REL_LT). Supported
relations names in input are: "gt", "ge", "eq", "le", "lt", ">>", ">=",
"=", "<=", "<<". ">" and "<" are also supported but should not be used as
they are obsolete aliases of ">=" and "<=".

=cut

sub version_normalize_relation($) {
    my $op = shift;

    warning('relation %s is deprecated: use %s or %s',
            $op, "$op$op", "$op=") if ($op eq '>' or $op eq '<');

    if ($op eq '>>' or $op eq 'gt') {
	return REL_GT;
    } elsif ($op eq '>=' or $op eq 'ge' or $op eq '>') {
	return REL_GE;
    } elsif ($op eq '=' or $op eq 'eq') {
	return REL_EQ;
    } elsif ($op eq '<=' or $op eq 'le' or $op eq '<') {
	return REL_LE;
    } elsif ($op eq '<<' or $op eq 'lt') {
	return REL_LT;
    } else {
	croak "bad relation '$op'";
    }
}

=item version_compare_string($a, $b)

String comparison function used for comparing non-numerical parts of version
numbers. Returns -1 if $a is earlier than $b, 0 if they are equal and 1 if $a
is later than $b.

The "~" character always sort lower than anything else. Digits sort lower
than non-digits. Among remaining characters alphabetic characters (A-Za-z)
sort lower than the other ones. Within each range, the ASCII decimal value
of the character is used to sort between characters.

=cut

sub _version_order {
    my ($x) = @_;

    if ($x eq '~') {
        return -1;
    } elsif ($x =~ /^\d$/) {
        return $x * 1 + 1;
    } elsif ($x =~ /^[A-Za-z]$/) {
        return ord($x);
    } else {
        return ord($x) + 256;
    }
}

sub version_compare_string($$) {
    my @a = map { _version_order($_) } split(//, shift);
    my @b = map { _version_order($_) } split(//, shift);
    while (1) {
        my ($a, $b) = (shift @a, shift @b);
        return 0 if not defined($a) and not defined($b);
        $a ||= 0; # Default order for "no character"
        $b ||= 0;
        return 1 if $a > $b;
        return -1 if $a < $b;
    }
}

=item version_compare_part($a, $b)

Compare two corresponding sub-parts of a version number (either upstream
version or debian revision).

Each parameter is split by version_split_digits() and resulting items
are compared together. As soon as a difference happens, it returns -1 if
$a is earlier than $b, 0 if they are equal and 1 if $a is later than $b.

=cut

sub version_compare_part($$) {
    my @a = version_split_digits(shift);
    my @b = version_split_digits(shift);
    while (1) {
        my ($a, $b) = (shift @a, shift @b);
        return 0 if not defined($a) and not defined($b);
        $a ||= 0; # Default value for lack of version
        $b ||= 0;
        if ($a =~ /^\d+$/ and $b =~ /^\d+$/) {
            # Numerical comparison
            my $cmp = $a <=> $b;
            return $cmp if $cmp;
        } else {
            # String comparison
            my $cmp = version_compare_string($a, $b);
            return $cmp if $cmp;
        }
    }
}

=item my @items = version_split_digits($version)

Splits a string in items that are each entirely composed either
of digits or of non-digits. For instance for "1.024~beta1+svn234" it would
return ("1", ".", "024", "~beta", "1", "+svn", "234").

=cut

sub version_split_digits($) {
    return split(/(?<=\d)(?=\D)|(?<=\D)(?=\d)/, $_[0]);
}

=item my ($ok, $msg) = version_check($version)

=item my $ok = version_check($version)

Checks the validity of $version as a version number. Returns 1 in $ok
if the version is valid, 0 otherwise. In the latter case, $msg
contains a description of the problem with the $version scalar.

=cut

sub version_check($) {
    my $version = shift;
    my $str;
    if (defined $version) {
        $str = "$version";
        $version = Dpkg::Version->new($str) unless ref($version);
    }
    if (not defined($str) or not length($str)) {
        my $msg = _g('version number cannot be empty');
        return (0, $msg) if wantarray;
        return 0;
    }
    if ($version->version() =~ m/^[^\d]/) {
        my $msg = _g('version number does not start with digit');
        return (0, $msg) if wantarray;
        return 0;
    }
    if ($str =~ m/([^-+:.0-9a-zA-Z~])/o) {
        my $msg = sprintf(_g("version number contains illegal character `%s'"), $1);
        return (0, $msg) if wantarray;
        return 0;
    }
    if ($version->epoch() !~ /^\d*$/) {
        my $msg = sprintf(_g('epoch part of the version number ' .
                             "is not a number: '%s'"), $version->epoch());
        return (0, $msg) if wantarray;
        return 0;
    }
    return (1, '') if wantarray;
    return 1;
}

=back

=head1 CHANGES

=head2 Version 1.01

New argument: Accept an options argument in $v->as_string().

New method: $v->is_native().

=head1 AUTHOR

Don Armstrong <don@donarmstrong.com>, Colin Watson
<cjwatson@debian.org> and Raphaël Hertzog <hertzog@debian.org>, based on
the implementation in F<dpkg/lib/version.c> by Ian Jackson and others.

=cut

1;