This file is indexed.

/usr/share/perl5/DBM/Deep/Array.pm is in libdbm-deep-perl 2.0013-1.

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
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
package DBM::Deep::Array;

use 5.008_004;

use strict;
use warnings FATAL => 'all';
no warnings 'recursion';

# This is to allow DBM::Deep::Array to handle negative indices on
# its own. Otherwise, Perl would intercept the call to negative
# indices for us. This was causing bugs for negative index handling.
our $NEGATIVE_INDICES = 1;

use base 'DBM::Deep';

use Scalar::Util ();

sub _get_self {
    # We used to have
    #  eval { local $SIG{'__DIE__'}; tied( @{$_[0]} ) } || $_[0]
    # but this does not always work during global destruction (DBM::Deep’s
    # destructor calls this method), but will return $_[0] even when $_[0]
    # is tied, if it’s tied to undef. In those cases it’s better to return
    # undef, so the destructor can tell not to do anything,  and,  if any-
    # thing else calls us, it will fail with a more helpful error message.

    Scalar::Util::reftype $_[0] eq 'ARRAY' ? tied @{$_[0]} : $_[0];
}

sub _repr { [] }

sub TIEARRAY {
    my $class = shift;
    my $args = $class->_get_args( @_ );

    $args->{type} = $class->TYPE_ARRAY;

    return $class->_init($args);
}

sub FETCH {
    my $self = shift->_get_self;
    my ($key) = @_;

    $self->lock_shared;

    if ( !defined $key ) {
        $self->unlock;
        DBM::Deep->_throw_error( "Cannot use an undefined array index." );
    }
    elsif ( $key =~ /^-?\d+$/ ) {
        if ( $key < 0 ) {
            $key += $self->FETCHSIZE;
            unless ( $key >= 0 ) {
                $self->unlock;
                return;
            }
        }
    }
    elsif ( $key ne 'length' ) {
        $self->unlock;
        DBM::Deep->_throw_error( "Cannot use '$key' as an array index." );
    }

    my $rv = $self->SUPER::FETCH( $key );

    $self->unlock;

    return $rv;
}

sub STORE {
    my $self = shift->_get_self;
    my ($key, $value) = @_;

    $self->lock_exclusive;

    my $size;
    my $idx_is_numeric;
    if ( !defined $key ) {
        $self->unlock;
        DBM::Deep->_throw_error( "Cannot use an undefined array index." );
    }
    elsif ( $key =~ /^-?\d+$/ ) {
        $idx_is_numeric = 1;
        if ( $key < 0 ) {
            $size = $self->FETCHSIZE;
            if ( $key + $size < 0 ) {
                die( "Modification of non-creatable array value attempted, subscript $key" );
            }
            $key += $size
        }
    }
    elsif ( $key ne 'length' ) {
        $self->unlock;
        DBM::Deep->_throw_error( "Cannot use '$key' as an array index." );
    }

    my $rv = $self->SUPER::STORE( $key, $value );

    if ( $idx_is_numeric ) {
        $size = $self->FETCHSIZE unless defined $size;
        if ( $key >= $size ) {
            $self->STORESIZE( $key + 1 );
        }
    }

    $self->unlock;

    return $rv;
}

sub EXISTS {
    my $self = shift->_get_self;
    my ($key) = @_;

    $self->lock_shared;

    if ( !defined $key ) {
        $self->unlock;
        DBM::Deep->_throw_error( "Cannot use an undefined array index." );
    }
    elsif ( $key =~ /^-?\d+$/ ) {
        if ( $key < 0 ) {
            $key += $self->FETCHSIZE;
            unless ( $key >= 0 ) {
                $self->unlock;
                return;
            }
        }
    }
    elsif ( $key ne 'length' ) {
        $self->unlock;
        DBM::Deep->_throw_error( "Cannot use '$key' as an array index." );
    }

    my $rv = $self->SUPER::EXISTS( $key );

    $self->unlock;

    return $rv;
}

sub DELETE {
    my $self = shift->_get_self;
    my ($key) = @_;
    warn "ARRAY::DELETE($self,$key)\n" if DBM::Deep::DEBUG;

    $self->lock_exclusive;

    my $size = $self->FETCHSIZE;
    if ( !defined $key ) {
        $self->unlock;
        DBM::Deep->_throw_error( "Cannot use an undefined array index." );
    }
    elsif ( $key =~ /^-?\d+$/ ) {
        if ( $key < 0 ) {
            $key += $size;
            unless ( $key >= 0 ) {
                $self->unlock;
                return;
            }
        }
    }
    elsif ( $key ne 'length' ) {
        $self->unlock;
        DBM::Deep->_throw_error( "Cannot use '$key' as an array index." );
    }

    my $rv = $self->SUPER::DELETE( $key );

    if ($rv && $key == $size - 1) {
        $self->STORESIZE( $key );
    }

    $self->unlock;

    return $rv;
}

# Now that we have a real Reference sector, we should store arrayzize there.
# However, arraysize needs to be transactionally-aware, so a simple location to
# store it isn't going to work.
sub FETCHSIZE {
    my $self = shift->_get_self;

    $self->lock_shared;

    my $SAVE_FILTER = $self->_engine->storage->{filter_fetch_value};
    $self->_engine->storage->{filter_fetch_value} = undef;

    my $size = $self->FETCH('length') || 0;

    $self->_engine->storage->{filter_fetch_value} = $SAVE_FILTER;

    $self->unlock;

    return $size;
}

sub STORESIZE {
    my $self = shift->_get_self;
    my ($new_length) = @_;

    $self->lock_exclusive;

    my $SAVE_FILTER = $self->_engine->storage->{filter_store_value};
    $self->_engine->storage->{filter_store_value} = undef;

    my $result = $self->STORE('length', $new_length, 'length');

    $self->_engine->storage->{filter_store_value} = $SAVE_FILTER;

    $self->unlock;

    return $result;
}

sub POP {
    my $self = shift->_get_self;

    $self->lock_exclusive;

    my $length = $self->FETCHSIZE();

    if ($length) {
        my $content = $self->FETCH( $length - 1 );
        $self->DELETE( $length - 1 );

        $self->unlock;

        return $content;
    }
    else {
        $self->unlock;
        return;
    }
}

sub PUSH {
    my $self = shift->_get_self;

    $self->lock_exclusive;

    my $length = $self->FETCHSIZE();

    for my $content (@_) {
        $self->STORE( $length, $content );
        $length++;
    }

    $self->unlock;

    return $length;
}

# XXX This really needs to be something more direct within the file, not a
# fetch and re-store. -RobK, 2007-09-20
sub _move_value {
    my $self = shift;
    my ($old_key, $new_key) = @_;

    return $self->_engine->make_reference( $self, $old_key, $new_key );
}

sub SHIFT {
    my $self = shift->_get_self;
    warn "SHIFT($self)\n" if DBM::Deep::DEBUG;

    $self->lock_exclusive;

    my $length = $self->FETCHSIZE();

    if ( !$length ) {
        $self->unlock;
        return;
    }

    my $content = $self->DELETE( 0 );

    # Unless the deletion above has cleared the array ...
    if ( $length > 1 ) {
        for (my $i = 0; $i < $length - 1; $i++) {
            $self->_move_value( $i+1, $i );
        }

        $self->DELETE( $length - 1 );
    }

    $self->unlock;

    return $content;
}

sub UNSHIFT {
    my $self = shift->_get_self;
    my @new_elements = @_;

    $self->lock_exclusive;

    my $length = $self->FETCHSIZE();
    my $new_size = scalar @new_elements;

    if ($length) {
        for (my $i = $length - 1; $i >= 0; $i--) {
            $self->_move_value( $i, $i+$new_size );
        }

        $self->STORESIZE( $length + $new_size );
    }

    for (my $i = 0; $i < $new_size; $i++) {
        $self->STORE( $i, $new_elements[$i] );
    }

    $self->unlock;

    return $length + $new_size;
}

sub SPLICE {
    my $self = shift->_get_self;

    $self->lock_exclusive;

    my $length = $self->FETCHSIZE();

    ##
    # Calculate offset and length of splice
    ##
    my $offset = shift;
    $offset = 0 unless defined $offset;
    if ($offset < 0) { $offset += $length; }

    my $splice_length;
    if (scalar @_) { $splice_length = shift; }
    else { $splice_length = $length - $offset; }
    if ($splice_length < 0) { $splice_length += ($length - $offset); }

    ##
    # Setup array with new elements, and copy out old elements for return
    ##
    my @new_elements = @_;
    my $new_size = scalar @new_elements;

    my @old_elements = map {
        $self->FETCH( $_ )
    } $offset .. ($offset + $splice_length - 1);

    ##
    # Adjust array length, and shift elements to accommodate new section.
    ##
    if ( $new_size != $splice_length ) {
        if ($new_size > $splice_length) {
            for (my $i = $length - 1; $i >= $offset + $splice_length; $i--) {
                $self->_move_value( $i, $i + ($new_size - $splice_length) );
            }
            $self->STORESIZE( $length + $new_size - $splice_length );
        }
        else {
            for (my $i = $offset + $splice_length; $i < $length; $i++) {
                $self->_move_value( $i, $i + ($new_size - $splice_length) );
            }
            for (my $i = 0; $i < $splice_length - $new_size; $i++) {
                $self->DELETE( $length - 1 );
                $length--;
            }
        }
    }

    ##
    # Insert new elements into array
    ##
    for (my $i = $offset; $i < $offset + $new_size; $i++) {
        $self->STORE( $i, shift @new_elements );
    }

    $self->unlock;

    ##
    # Return deleted section, or last element in scalar context.
    ##
    return wantarray ? @old_elements : $old_elements[-1];
}

# We don't need to populate it, yet.
# It will be useful, though, when we split out HASH and ARRAY
# Perl will call EXTEND() when the array is likely to grow.
# We don't care, but include it because it gets called at times.
sub EXTEND {}

sub _copy_node {
    my $self = shift;
    my ($db_temp) = @_;

    my $length = $self->length();
    for (my $index = 0; $index < $length; $index++) {
        $self->_copy_value( \$db_temp->[$index], $self->get($index) );
    }

    return 1;
}

sub _clear {
    my $self = shift;

    my $size = $self->FETCHSIZE;
    for my $key ( 0 .. $size - 1 ) {
        $self->_engine->delete_key( $self, $key, $key );
    }
    $self->STORESIZE( 0 );

    return;
}

sub length  { (shift)->FETCHSIZE(@_) }
sub pop     { (shift)->POP(@_)       }
sub push    { (shift)->PUSH(@_)      }
sub unshift { (shift)->UNSHIFT(@_)   }
sub splice  { (shift)->SPLICE(@_)    }

# This must be last otherwise we have to qualify all other calls to shift
# as calls to CORE::shift
sub shift { (CORE::shift)->SHIFT(@_) }

1;
__END__