Commit | Line | Data |
51e9eee3 |
1 | package DBM::Deep::Engine::File; |
a20d9a3f |
2 | |
2120a181 |
3 | use 5.006_000; |
460b1067 |
4 | |
a20d9a3f |
5 | use strict; |
065b45be |
6 | use warnings FATAL => 'all'; |
a20d9a3f |
7 | |
51e9eee3 |
8 | use base qw( DBM::Deep::Engine ); |
9 | |
75a6a379 |
10 | use Scalar::Util (); |
d6d8e27e |
11 | |
f0276afb |
12 | use DBM::Deep::Null (); |
2c70efe1 |
13 | use DBM::Deep::Sector::File (); |
14 | use DBM::Deep::Storage::File (); |
f0276afb |
15 | |
9c87a079 |
16 | my $STALE_SIZE = 2; |
8db25060 |
17 | |
2120a181 |
18 | # Please refer to the pack() documentation for further information |
19 | my %StP = ( |
e9b0b5f0 |
20 | 1 => 'C', # Unsigned char value (no order needed as it's just one byte) |
2120a181 |
21 | 2 => 'n', # Unsigned short in "network" (big-endian) order |
22 | 4 => 'N', # Unsigned long in "network" (big-endian) order |
23 | 8 => 'Q', # Usigned quad (no order specified, presumably machine-dependent) |
24 | ); |
00d9bd0b |
25 | |
ae6c15b8 |
26 | =head1 NAME |
27 | |
64a531e5 |
28 | DBM::Deep::Engine::File |
ae6c15b8 |
29 | |
30 | =head1 PURPOSE |
31 | |
64a531e5 |
32 | This is the engine for use with L<DBM::Deep::Storage::File/>. |
ae6c15b8 |
33 | |
34 | =head1 EXTERNAL METHODS |
35 | |
ae6c15b8 |
36 | =head2 new() |
37 | |
38 | This takes a set of args. These args are described in the documentation for |
39 | L<DBM::Deep/new>. |
40 | |
41 | =cut |
42 | |
612969fb |
43 | sub new { |
44 | my $class = shift; |
45 | my ($args) = @_; |
46 | |
d426259c |
47 | $args->{storage} = DBM::Deep::Storage::File->new( $args ) |
f1879fdc |
48 | unless exists $args->{storage}; |
49 | |
612969fb |
50 | my $self = bless { |
2120a181 |
51 | byte_size => 4, |
52 | |
53 | digest => undef, |
54 | hash_size => 16, # In bytes |
55 | hash_chars => 256, # Number of chars the algorithm uses per byte |
612969fb |
56 | max_buckets => 16, |
e9b0b5f0 |
57 | num_txns => 1, # The HEAD |
2120a181 |
58 | trans_id => 0, # Default to the HEAD |
460b1067 |
59 | |
e9b0b5f0 |
60 | data_sector_size => 64, # Size in bytes of each data sector |
61 | |
2120a181 |
62 | entries => {}, # This is the list of entries for transactions |
83371fe3 |
63 | storage => undef, |
612969fb |
64 | }, $class; |
65 | |
e9b0b5f0 |
66 | # Never allow byte_size to be set directly. |
67 | delete $args->{byte_size}; |
e0098e7f |
68 | if ( defined $args->{pack_size} ) { |
69 | if ( lc $args->{pack_size} eq 'small' ) { |
2120a181 |
70 | $args->{byte_size} = 2; |
e0098e7f |
71 | } |
72 | elsif ( lc $args->{pack_size} eq 'medium' ) { |
2120a181 |
73 | $args->{byte_size} = 4; |
e0098e7f |
74 | } |
75 | elsif ( lc $args->{pack_size} eq 'large' ) { |
2120a181 |
76 | $args->{byte_size} = 8; |
e0098e7f |
77 | } |
78 | else { |
2120a181 |
79 | DBM::Deep->_throw_error( "Unknown pack_size value: '$args->{pack_size}'" ); |
e0098e7f |
80 | } |
81 | } |
82 | |
fde3db1a |
83 | # Grab the parameters we want to use |
84 | foreach my $param ( keys %$self ) { |
85 | next unless exists $args->{$param}; |
3e9498a1 |
86 | $self->{$param} = $args->{$param}; |
fde3db1a |
87 | } |
88 | |
e9b0b5f0 |
89 | my %validations = ( |
90 | max_buckets => { floor => 16, ceil => 256 }, |
91 | num_txns => { floor => 1, ceil => 255 }, |
92 | data_sector_size => { floor => 32, ceil => 256 }, |
93 | ); |
94 | |
95 | while ( my ($attr, $c) = each %validations ) { |
96 | if ( !defined $self->{$attr} |
97 | || !length $self->{$attr} |
98 | || $self->{$attr} =~ /\D/ |
99 | || $self->{$attr} < $c->{floor} |
100 | ) { |
101 | $self->{$attr} = '(undef)' if !defined $self->{$attr}; |
102 | warn "Floor of $attr is $c->{floor}. Setting it to $c->{floor} from '$self->{$attr}'\n"; |
103 | $self->{$attr} = $c->{floor}; |
104 | } |
105 | elsif ( $self->{$attr} > $c->{ceil} ) { |
106 | warn "Ceiling of $attr is $c->{ceil}. Setting it to $c->{ceil} from '$self->{$attr}'\n"; |
107 | $self->{$attr} = $c->{ceil}; |
108 | } |
e0098e7f |
109 | } |
110 | |
2120a181 |
111 | if ( !$self->{digest} ) { |
112 | require Digest::MD5; |
113 | $self->{digest} = \&Digest::MD5::md5; |
114 | } |
115 | |
260a80b4 |
116 | return $self; |
117 | } |
118 | |
2120a181 |
119 | sub read_value { |
c3aafc14 |
120 | my $self = shift; |
2120a181 |
121 | my ($obj, $key) = @_; |
122 | |
123 | # This will be a Reference sector |
2c70efe1 |
124 | my $sector = DBM::Deep::Sector::File->load( $self, $obj->_base_offset ) |
2120a181 |
125 | or return; |
126 | |
127 | if ( $sector->staleness != $obj->_staleness ) { |
128 | return; |
129 | } |
130 | |
131 | my $key_md5 = $self->_apply_digest( $key ); |
132 | |
133 | my $value_sector = $sector->get_data_for({ |
134 | key_md5 => $key_md5, |
135 | allow_head => 1, |
136 | }); |
137 | |
138 | unless ( $value_sector ) { |
2c70efe1 |
139 | $value_sector = DBM::Deep::Sector::File::Null->new({ |
2120a181 |
140 | engine => $self, |
141 | data => undef, |
142 | }); |
143 | |
144 | $sector->write_data({ |
145 | key_md5 => $key_md5, |
146 | key => $key, |
147 | value => $value_sector, |
148 | }); |
149 | } |
150 | |
151 | return $value_sector->data; |
c3aafc14 |
152 | } |
153 | |
2120a181 |
154 | sub get_classname { |
260a80b4 |
155 | my $self = shift; |
2120a181 |
156 | my ($obj) = @_; |
260a80b4 |
157 | |
2120a181 |
158 | # This will be a Reference sector |
2c70efe1 |
159 | my $sector = DBM::Deep::Sector::File->load( $self, $obj->_base_offset ) |
2120a181 |
160 | or DBM::Deep->_throw_error( "How did get_classname fail (no sector for '$obj')?!" ); |
612969fb |
161 | |
2120a181 |
162 | if ( $sector->staleness != $obj->_staleness ) { |
163 | return; |
164 | } |
ea2f6d67 |
165 | |
2120a181 |
166 | return $sector->get_classname; |
1bf65be7 |
167 | } |
168 | |
1cff45d7 |
169 | sub make_reference { |
170 | my $self = shift; |
171 | my ($obj, $old_key, $new_key) = @_; |
172 | |
173 | # This will be a Reference sector |
2c70efe1 |
174 | my $sector = DBM::Deep::Sector::File->load( $self, $obj->_base_offset ) |
ae6c15b8 |
175 | or DBM::Deep->_throw_error( "How did make_reference fail (no sector for '$obj')?!" ); |
1cff45d7 |
176 | |
177 | if ( $sector->staleness != $obj->_staleness ) { |
178 | return; |
179 | } |
180 | |
181 | my $old_md5 = $self->_apply_digest( $old_key ); |
182 | |
183 | my $value_sector = $sector->get_data_for({ |
184 | key_md5 => $old_md5, |
185 | allow_head => 1, |
186 | }); |
187 | |
188 | unless ( $value_sector ) { |
2c70efe1 |
189 | $value_sector = DBM::Deep::Sector::File::Null->new({ |
1cff45d7 |
190 | engine => $self, |
191 | data => undef, |
192 | }); |
193 | |
194 | $sector->write_data({ |
195 | key_md5 => $old_md5, |
196 | key => $old_key, |
197 | value => $value_sector, |
198 | }); |
199 | } |
200 | |
2c70efe1 |
201 | if ( $value_sector->isa( 'DBM::Deep::Sector::File::Reference' ) ) { |
1cff45d7 |
202 | $sector->write_data({ |
203 | key => $new_key, |
204 | key_md5 => $self->_apply_digest( $new_key ), |
205 | value => $value_sector, |
206 | }); |
207 | $value_sector->increment_refcount; |
208 | } |
209 | else { |
210 | $sector->write_data({ |
211 | key => $new_key, |
212 | key_md5 => $self->_apply_digest( $new_key ), |
213 | value => $value_sector->clone, |
214 | }); |
215 | } |
ae6c15b8 |
216 | |
217 | return; |
1cff45d7 |
218 | } |
219 | |
2120a181 |
220 | sub key_exists { |
0d0f3d5d |
221 | my $self = shift; |
2120a181 |
222 | my ($obj, $key) = @_; |
0d0f3d5d |
223 | |
2120a181 |
224 | # This will be a Reference sector |
2c70efe1 |
225 | my $sector = DBM::Deep::Sector::File->load( $self, $obj->_base_offset ) |
2120a181 |
226 | or return ''; |
0d0f3d5d |
227 | |
2120a181 |
228 | if ( $sector->staleness != $obj->_staleness ) { |
229 | return ''; |
230 | } |
0d0f3d5d |
231 | |
2120a181 |
232 | my $data = $sector->get_data_for({ |
233 | key_md5 => $self->_apply_digest( $key ), |
234 | allow_head => 1, |
235 | }); |
20b7f047 |
236 | |
2120a181 |
237 | # exists() returns 1 or '' for true/false. |
238 | return $data ? 1 : ''; |
0d0f3d5d |
239 | } |
240 | |
2120a181 |
241 | sub delete_key { |
e064ccd1 |
242 | my $self = shift; |
2120a181 |
243 | my ($obj, $key) = @_; |
e064ccd1 |
244 | |
2c70efe1 |
245 | my $sector = DBM::Deep::Sector::File->load( $self, $obj->_base_offset ) |
2120a181 |
246 | or return; |
460b1067 |
247 | |
2120a181 |
248 | if ( $sector->staleness != $obj->_staleness ) { |
249 | return; |
250 | } |
251 | |
252 | return $sector->delete_key({ |
253 | key_md5 => $self->_apply_digest( $key ), |
254 | allow_head => 0, |
255 | }); |
256 | } |
257 | |
258 | sub write_value { |
259 | my $self = shift; |
260 | my ($obj, $key, $value) = @_; |
261 | |
262 | my $r = Scalar::Util::reftype( $value ) || ''; |
263 | { |
264 | last if $r eq ''; |
265 | last if $r eq 'HASH'; |
266 | last if $r eq 'ARRAY'; |
e064ccd1 |
267 | |
2120a181 |
268 | DBM::Deep->_throw_error( |
269 | "Storage of references of type '$r' is not supported." |
270 | ); |
460b1067 |
271 | } |
260a80b4 |
272 | |
1cff45d7 |
273 | # This will be a Reference sector |
2c70efe1 |
274 | my $sector = DBM::Deep::Sector::File->load( $self, $obj->_base_offset ) |
9c87a079 |
275 | or DBM::Deep->_throw_error( "Cannot write to a deleted spot in DBM::Deep." ); |
1cff45d7 |
276 | |
277 | if ( $sector->staleness != $obj->_staleness ) { |
9c87a079 |
278 | DBM::Deep->_throw_error( "Cannot write to a deleted spot in DBM::Deep." ); |
1cff45d7 |
279 | } |
280 | |
2120a181 |
281 | my ($class, $type); |
282 | if ( !defined $value ) { |
2c70efe1 |
283 | $class = 'DBM::Deep::Sector::File::Null'; |
2120a181 |
284 | } |
285 | elsif ( $r eq 'ARRAY' || $r eq 'HASH' ) { |
75a6a379 |
286 | my $tmpvar; |
287 | if ( $r eq 'ARRAY' ) { |
288 | $tmpvar = tied @$value; |
289 | } elsif ( $r eq 'HASH' ) { |
290 | $tmpvar = tied %$value; |
291 | } |
5ef7542f |
292 | |
edd45134 |
293 | if ( $tmpvar ) { |
294 | my $is_dbm_deep = eval { local $SIG{'__DIE__'}; $tmpvar->isa( 'DBM::Deep' ); }; |
295 | |
296 | unless ( $is_dbm_deep ) { |
297 | DBM::Deep->_throw_error( "Cannot store something that is tied." ); |
298 | } |
299 | |
d6d8e27e |
300 | unless ( $tmpvar->_engine->storage == $self->storage ) { |
75a6a379 |
301 | DBM::Deep->_throw_error( "Cannot store values across DBM::Deep files. Please use export() instead." ); |
5ef7542f |
302 | } |
5ef7542f |
303 | |
2c70efe1 |
304 | # First, verify if we're storing the same thing to this spot. If we |
305 | # are, then this should be a no-op. -EJS, 2008-05-19 |
d6d8e27e |
306 | my $loc = $sector->get_data_location_for({ |
307 | key_md5 => $self->_apply_digest( $key ), |
308 | allow_head => 1, |
309 | }); |
310 | |
311 | if ( defined($loc) && $loc == $tmpvar->_base_offset ) { |
1cff45d7 |
312 | return 1; |
313 | } |
314 | |
edd45134 |
315 | #XXX Can this use $loc? |
2c70efe1 |
316 | my $value_sector = DBM::Deep::Sector::File->load( $self, $tmpvar->_base_offset ); |
d6d8e27e |
317 | $sector->write_data({ |
318 | key => $key, |
319 | key_md5 => $self->_apply_digest( $key ), |
320 | value => $value_sector, |
321 | }); |
322 | $value_sector->increment_refcount; |
323 | |
324 | return 1; |
1cff45d7 |
325 | } |
edd45134 |
326 | |
2c70efe1 |
327 | $class = 'DBM::Deep::Sector::File::Reference'; |
2120a181 |
328 | $type = substr( $r, 0, 1 ); |
329 | } |
330 | else { |
1cff45d7 |
331 | if ( tied($value) ) { |
332 | DBM::Deep->_throw_error( "Cannot store something that is tied." ); |
333 | } |
2c70efe1 |
334 | $class = 'DBM::Deep::Sector::File::Scalar'; |
460b1067 |
335 | } |
9b2370e0 |
336 | |
2c70efe1 |
337 | # Create this after loading the reference sector in case something bad |
338 | # happens. This way, we won't allocate value sector(s) needlessly. |
2120a181 |
339 | my $value_sector = $class->new({ |
340 | engine => $self, |
341 | data => $value, |
342 | type => $type, |
343 | }); |
75a6a379 |
344 | |
2120a181 |
345 | $sector->write_data({ |
346 | key => $key, |
347 | key_md5 => $self->_apply_digest( $key ), |
348 | value => $value_sector, |
349 | }); |
350 | |
2c70efe1 |
351 | # This code is to make sure we write all the values in the $value to the |
352 | # disk and to make sure all changes to $value after the assignment are |
353 | # reflected on disk. This may be counter-intuitive at first, but it is |
354 | # correct dwimmery. |
355 | # NOTE - simply tying $value won't perform a STORE on each value. Hence, |
356 | # the copy to a temp value. |
2120a181 |
357 | if ( $r eq 'ARRAY' ) { |
358 | my @temp = @$value; |
359 | tie @$value, 'DBM::Deep', { |
360 | base_offset => $value_sector->offset, |
361 | staleness => $value_sector->staleness, |
362 | storage => $self->storage, |
363 | engine => $self, |
364 | }; |
365 | @$value = @temp; |
366 | bless $value, 'DBM::Deep::Array' unless Scalar::Util::blessed( $value ); |
e064ccd1 |
367 | } |
2120a181 |
368 | elsif ( $r eq 'HASH' ) { |
369 | my %temp = %$value; |
370 | tie %$value, 'DBM::Deep', { |
371 | base_offset => $value_sector->offset, |
372 | staleness => $value_sector->staleness, |
373 | storage => $self->storage, |
374 | engine => $self, |
375 | }; |
e064ccd1 |
376 | |
2120a181 |
377 | %$value = %temp; |
378 | bless $value, 'DBM::Deep::Hash' unless Scalar::Util::blessed( $value ); |
379 | } |
460b1067 |
380 | |
2120a181 |
381 | return 1; |
e064ccd1 |
382 | } |
383 | |
f4d0ac97 |
384 | sub setup { |
2120a181 |
385 | my $self = shift; |
386 | my ($obj) = @_; |
359a01ac |
387 | |
9c87a079 |
388 | # We're opening the file. |
389 | unless ( $obj->_base_offset ) { |
390 | my $bytes_read = $self->_read_file_header; |
118ba343 |
391 | |
9c87a079 |
392 | # Creating a new file |
393 | unless ( $bytes_read ) { |
394 | $self->_write_file_header; |
118ba343 |
395 | |
9c87a079 |
396 | # 1) Create Array/Hash entry |
2c70efe1 |
397 | my $initial_reference = DBM::Deep::Sector::File::Reference->new({ |
9c87a079 |
398 | engine => $self, |
399 | type => $obj->_type, |
400 | }); |
401 | $obj->{base_offset} = $initial_reference->offset; |
402 | $obj->{staleness} = $initial_reference->staleness; |
118ba343 |
403 | |
9c87a079 |
404 | $self->storage->flush; |
118ba343 |
405 | } |
9c87a079 |
406 | # Reading from an existing file |
407 | else { |
408 | $obj->{base_offset} = $bytes_read; |
2c70efe1 |
409 | my $initial_reference = DBM::Deep::Sector::File::Reference->new({ |
9c87a079 |
410 | engine => $self, |
411 | offset => $obj->_base_offset, |
412 | }); |
413 | unless ( $initial_reference ) { |
414 | DBM::Deep->_throw_error("Corrupted file, no master index record"); |
415 | } |
2120a181 |
416 | |
9c87a079 |
417 | unless ($obj->_type eq $initial_reference->type) { |
418 | DBM::Deep->_throw_error("File type mismatch"); |
419 | } |
f1879fdc |
420 | |
9c87a079 |
421 | $obj->{staleness} = $initial_reference->staleness; |
422 | } |
118ba343 |
423 | } |
2120a181 |
424 | |
a5bdb1ac |
425 | $self->storage->set_inode; |
426 | |
2120a181 |
427 | return 1; |
428 | } |
429 | |
430 | sub begin_work { |
431 | my $self = shift; |
432 | my ($obj) = @_; |
433 | |
434 | if ( $self->trans_id ) { |
435 | DBM::Deep->_throw_error( "Cannot begin_work within an active transaction" ); |
436 | } |
437 | |
438 | my @slots = $self->read_txn_slots; |
e9b0b5f0 |
439 | my $found; |
440 | for my $i ( 0 .. $#slots ) { |
2120a181 |
441 | next if $slots[$i]; |
e9b0b5f0 |
442 | |
2120a181 |
443 | $slots[$i] = 1; |
e9b0b5f0 |
444 | $self->set_trans_id( $i + 1 ); |
445 | $found = 1; |
2120a181 |
446 | last; |
447 | } |
e9b0b5f0 |
448 | unless ( $found ) { |
449 | DBM::Deep->_throw_error( "Cannot allocate transaction ID" ); |
450 | } |
2120a181 |
451 | $self->write_txn_slots( @slots ); |
452 | |
453 | if ( !$self->trans_id ) { |
454 | DBM::Deep->_throw_error( "Cannot begin_work - no available transactions" ); |
455 | } |
456 | |
457 | return; |
458 | } |
459 | |
460 | sub rollback { |
461 | my $self = shift; |
462 | my ($obj) = @_; |
463 | |
464 | if ( !$self->trans_id ) { |
465 | DBM::Deep->_throw_error( "Cannot rollback without an active transaction" ); |
466 | } |
467 | |
9c87a079 |
468 | # Each entry is the file location for a bucket that has a modification for |
469 | # this transaction. The entries need to be expunged. |
470 | foreach my $entry (@{ $self->get_entries } ) { |
471 | # Remove the entry here |
472 | my $read_loc = $entry |
473 | + $self->hash_size |
474 | + $self->byte_size |
475 | + $self->byte_size |
476 | + ($self->trans_id - 1) * ( $self->byte_size + $STALE_SIZE ); |
477 | |
478 | my $data_loc = $self->storage->read_at( $read_loc, $self->byte_size ); |
479 | $data_loc = unpack( $StP{$self->byte_size}, $data_loc ); |
480 | $self->storage->print_at( $read_loc, pack( $StP{$self->byte_size}, 0 ) ); |
481 | |
482 | if ( $data_loc > 1 ) { |
2c70efe1 |
483 | DBM::Deep::Sector::File->load( $self, $data_loc )->free; |
9c87a079 |
484 | } |
db2eb673 |
485 | } |
486 | |
2120a181 |
487 | $self->clear_entries; |
70b55428 |
488 | |
2120a181 |
489 | my @slots = $self->read_txn_slots; |
e9b0b5f0 |
490 | $slots[$self->trans_id-1] = 0; |
2120a181 |
491 | $self->write_txn_slots( @slots ); |
492 | $self->inc_txn_staleness_counter( $self->trans_id ); |
493 | $self->set_trans_id( 0 ); |
6fde4ed2 |
494 | |
70b55428 |
495 | return 1; |
496 | } |
497 | |
2120a181 |
498 | sub commit { |
16d1ad9b |
499 | my $self = shift; |
2120a181 |
500 | my ($obj) = @_; |
501 | |
502 | if ( !$self->trans_id ) { |
503 | DBM::Deep->_throw_error( "Cannot commit without an active transaction" ); |
504 | } |
505 | |
9c87a079 |
506 | foreach my $entry (@{ $self->get_entries } ) { |
507 | # Overwrite the entry in head with the entry in trans_id |
508 | my $base = $entry |
509 | + $self->hash_size |
510 | + $self->byte_size; |
511 | |
512 | my $head_loc = $self->storage->read_at( $base, $self->byte_size ); |
513 | $head_loc = unpack( $StP{$self->byte_size}, $head_loc ); |
514 | |
515 | my $spot = $base + $self->byte_size + ($self->trans_id - 1) * ( $self->byte_size + $STALE_SIZE ); |
516 | my $trans_loc = $self->storage->read_at( |
517 | $spot, $self->byte_size, |
518 | ); |
519 | |
520 | $self->storage->print_at( $base, $trans_loc ); |
521 | $self->storage->print_at( |
522 | $spot, |
523 | pack( $StP{$self->byte_size} . ' ' . $StP{$STALE_SIZE}, (0) x 2 ), |
524 | ); |
525 | |
526 | if ( $head_loc > 1 ) { |
2c70efe1 |
527 | DBM::Deep::Sector::File->load( $self, $head_loc )->free; |
9c87a079 |
528 | } |
db2eb673 |
529 | } |
530 | |
2120a181 |
531 | $self->clear_entries; |
532 | |
533 | my @slots = $self->read_txn_slots; |
e9b0b5f0 |
534 | $slots[$self->trans_id-1] = 0; |
2120a181 |
535 | $self->write_txn_slots( @slots ); |
536 | $self->inc_txn_staleness_counter( $self->trans_id ); |
537 | $self->set_trans_id( 0 ); |
538 | |
539 | return 1; |
16d1ad9b |
540 | } |
541 | |
ae6c15b8 |
542 | =head1 INTERNAL METHODS |
543 | |
51e9eee3 |
544 | The following methods are internal-use-only to DBM::Deep::Engine::File. |
ae6c15b8 |
545 | |
546 | =cut |
547 | |
548 | =head2 read_txn_slots() |
549 | |
550 | This takes no arguments. |
551 | |
552 | This will return an array with a 1 or 0 in each slot. Each spot represents one |
553 | available transaction. If the slot is 1, that transaction is taken. If it is 0, |
554 | the transaction is available. |
555 | |
556 | =cut |
557 | |
2120a181 |
558 | sub read_txn_slots { |
d4b1166e |
559 | my $self = shift; |
9c87a079 |
560 | my $bl = $self->txn_bitfield_len; |
561 | my $num_bits = $bl * 8; |
562 | return split '', unpack( 'b'.$num_bits, |
563 | $self->storage->read_at( |
564 | $self->trans_loc, $bl, |
565 | ) |
566 | ); |
2120a181 |
567 | } |
20f7b20c |
568 | |
ae6c15b8 |
569 | =head2 write_txn_slots( @slots ) |
570 | |
571 | This takes an array of 1's and 0's. This array represents the transaction slots |
572 | returned by L</read_txn_slots()>. In other words, the following is true: |
573 | |
574 | @x = read_txn_slots( write_txn_slots( @x ) ); |
575 | |
576 | (With the obviously missing object referents added back in.) |
577 | |
578 | =cut |
579 | |
2120a181 |
580 | sub write_txn_slots { |
581 | my $self = shift; |
9c87a079 |
582 | my $num_bits = $self->txn_bitfield_len * 8; |
583 | $self->storage->print_at( $self->trans_loc, |
584 | pack( 'b'.$num_bits, join('', @_) ), |
585 | ); |
2120a181 |
586 | } |
587 | |
ae6c15b8 |
588 | =head2 get_running_txn_ids() |
589 | |
590 | This takes no arguments. |
591 | |
592 | This will return an array of taken transaction IDs. This wraps L</read_txn_slots()>. |
593 | |
594 | =cut |
595 | |
2120a181 |
596 | sub get_running_txn_ids { |
597 | my $self = shift; |
598 | my @transactions = $self->read_txn_slots; |
ae6c15b8 |
599 | my @trans_ids = map { $_+1 } grep { $transactions[$_] } 0 .. $#transactions; |
2120a181 |
600 | } |
601 | |
ae6c15b8 |
602 | =head2 get_txn_staleness_counter( $trans_id ) |
603 | |
604 | This will return the staleness counter for the given transaction ID. Please see |
605 | L</TRANSACTION STALENESS> for more information. |
606 | |
607 | =cut |
608 | |
2120a181 |
609 | sub get_txn_staleness_counter { |
610 | my $self = shift; |
9c87a079 |
611 | my ($trans_id) = @_; |
612 | |
613 | # Hardcode staleness of 0 for the HEAD |
614 | return 0 unless $trans_id; |
615 | |
616 | return unpack( $StP{$STALE_SIZE}, |
617 | $self->storage->read_at( |
618 | $self->trans_loc + $self->txn_bitfield_len + $STALE_SIZE * ($trans_id - 1), |
619 | $STALE_SIZE, |
620 | ) |
621 | ); |
d4b1166e |
622 | } |
623 | |
ae6c15b8 |
624 | =head2 inc_txn_staleness_counter( $trans_id ) |
625 | |
626 | This will increment the staleness counter for the given transaction ID. Please see |
627 | L</TRANSACTION STALENESS> for more information. |
628 | |
629 | =cut |
630 | |
2120a181 |
631 | sub inc_txn_staleness_counter { |
d4b1166e |
632 | my $self = shift; |
9c87a079 |
633 | my ($trans_id) = @_; |
634 | |
635 | # Hardcode staleness of 0 for the HEAD |
636 | return 0 unless $trans_id; |
637 | |
638 | $self->storage->print_at( |
639 | $self->trans_loc + $self->txn_bitfield_len + $STALE_SIZE * ($trans_id - 1), |
640 | pack( $StP{$STALE_SIZE}, $self->get_txn_staleness_counter( $trans_id ) + 1 ), |
641 | ); |
2120a181 |
642 | } |
20f7b20c |
643 | |
ae6c15b8 |
644 | =head2 get_entries() |
645 | |
646 | This takes no arguments. |
647 | |
648 | This returns a list of all the sectors that have been modified by this transaction. |
649 | |
650 | =cut |
651 | |
2120a181 |
652 | sub get_entries { |
653 | my $self = shift; |
654 | return [ keys %{ $self->{entries}{$self->trans_id} ||= {} } ]; |
d4b1166e |
655 | } |
656 | |
ae6c15b8 |
657 | =head2 add_entry( $trans_id, $location ) |
658 | |
3b90cc56 |
659 | This takes a transaction ID and a file location and marks the sector at that |
660 | location as having been modified by the transaction identified by $trans_id. |
ae6c15b8 |
661 | |
662 | This returns nothing. |
663 | |
664 | B<NOTE>: Unlike all the other _entries() methods, there are several cases where |
665 | C<< $trans_id != $self->trans_id >> for this method. |
666 | |
667 | =cut |
668 | |
2120a181 |
669 | sub add_entry { |
ea2f6d67 |
670 | my $self = shift; |
9c87a079 |
671 | my ($trans_id, $loc) = @_; |
97d40a0a |
672 | |
2120a181 |
673 | $self->{entries}{$trans_id} ||= {}; |
9c87a079 |
674 | $self->{entries}{$trans_id}{$loc} = undef; |
2120a181 |
675 | } |
ea2f6d67 |
676 | |
ae6c15b8 |
677 | =head2 reindex_entry( $old_loc, $new_loc ) |
678 | |
3b90cc56 |
679 | This takes two locations (old and new, respectively). If a location that has |
680 | been modified by this transaction is subsequently reindexed due to a bucketlist |
ae6c15b8 |
681 | overflowing, then the entries hash needs to be made aware of this change. |
682 | |
683 | This returns nothing. |
684 | |
685 | =cut |
686 | |
2120a181 |
687 | sub reindex_entry { |
688 | my $self = shift; |
9c87a079 |
689 | my ($old_loc, $new_loc) = @_; |
2120a181 |
690 | |
691 | TRANS: |
692 | while ( my ($trans_id, $locs) = each %{ $self->{entries} } ) { |
9c87a079 |
693 | if ( exists $locs->{$old_loc} ) { |
694 | delete $locs->{$old_loc}; |
695 | $locs->{$new_loc} = undef; |
695c88b1 |
696 | next TRANS; |
2120a181 |
697 | } |
ea2f6d67 |
698 | } |
ea2f6d67 |
699 | } |
700 | |
ae6c15b8 |
701 | =head2 clear_entries() |
702 | |
3b90cc56 |
703 | This takes no arguments. It will clear the entries list for the running |
704 | transaction. |
ae6c15b8 |
705 | |
706 | This returns nothing. |
707 | |
708 | =cut |
709 | |
2120a181 |
710 | sub clear_entries { |
d4b1166e |
711 | my $self = shift; |
2120a181 |
712 | delete $self->{entries}{$self->trans_id}; |
713 | } |
eea0d863 |
714 | |
ae6c15b8 |
715 | =head2 _write_file_header() |
716 | |
717 | This writes the file header for a new file. This will write the various settings |
718 | that set how the file is interpreted. |
719 | |
720 | =head2 _read_file_header() |
721 | |
722 | This reads the file header from an existing file. This will read the various |
723 | settings that set how the file is interpreted. |
724 | |
725 | =cut |
726 | |
9c87a079 |
727 | { |
51e9eee3 |
728 | my $header_fixed = length( __PACKAGE__->SIG_FILE ) + 1 + 4 + 4; |
9c87a079 |
729 | my $this_file_version = 3; |
16d1ad9b |
730 | |
9c87a079 |
731 | sub _write_file_header { |
732 | my $self = shift; |
75be6413 |
733 | |
9c87a079 |
734 | my $nt = $self->num_txns; |
735 | my $bl = $self->txn_bitfield_len; |
75be6413 |
736 | |
9c87a079 |
737 | my $header_var = 1 + 1 + 1 + 1 + $bl + $STALE_SIZE * ($nt - 1) + 3 * $self->byte_size; |
75be6413 |
738 | |
9c87a079 |
739 | my $loc = $self->storage->request_space( $header_fixed + $header_var ); |
75be6413 |
740 | |
9c87a079 |
741 | $self->storage->print_at( $loc, |
51e9eee3 |
742 | $self->SIG_FILE, |
743 | $self->SIG_HEADER, |
9c87a079 |
744 | pack('N', $this_file_version), # At this point, we're at 9 bytes |
745 | pack('N', $header_var), # header size |
746 | # --- Above is $header_fixed. Below is $header_var |
747 | pack('C', $self->byte_size), |
75be6413 |
748 | |
9c87a079 |
749 | # These shenanigans are to allow a 256 within a C |
750 | pack('C', $self->max_buckets - 1), |
751 | pack('C', $self->data_sector_size - 1), |
75be6413 |
752 | |
9c87a079 |
753 | pack('C', $nt), |
754 | pack('C' . $bl, 0 ), # Transaction activeness bitfield |
755 | pack($StP{$STALE_SIZE}.($nt-1), 0 x ($nt-1) ), # Transaction staleness counters |
756 | pack($StP{$self->byte_size}, 0), # Start of free chain (blist size) |
757 | pack($StP{$self->byte_size}, 0), # Start of free chain (data size) |
758 | pack($StP{$self->byte_size}, 0), # Start of free chain (index size) |
759 | ); |
75be6413 |
760 | |
9c87a079 |
761 | #XXX Set these less fragilely |
762 | $self->set_trans_loc( $header_fixed + 4 ); |
763 | $self->set_chains_loc( $header_fixed + 4 + $bl + $STALE_SIZE * ($nt-1) ); |
75be6413 |
764 | |
9c87a079 |
765 | return; |
badf847c |
766 | } |
7b1e1aa1 |
767 | |
9c87a079 |
768 | sub _read_file_header { |
badf847c |
769 | my $self = shift; |
75be6413 |
770 | |
9c87a079 |
771 | my $buffer = $self->storage->read_at( 0, $header_fixed ); |
772 | return unless length($buffer); |
2603d86e |
773 | |
9c87a079 |
774 | my ($file_signature, $sig_header, $file_version, $size) = unpack( |
775 | 'A4 A N N', $buffer |
776 | ); |
75be6413 |
777 | |
51e9eee3 |
778 | unless ( $file_signature eq $self->SIG_FILE ) { |
9c87a079 |
779 | $self->storage->close; |
780 | DBM::Deep->_throw_error( "Signature not found -- file is not a Deep DB" ); |
781 | } |
7b1e1aa1 |
782 | |
51e9eee3 |
783 | unless ( $sig_header eq $self->SIG_HEADER ) { |
9c87a079 |
784 | $self->storage->close; |
785 | DBM::Deep->_throw_error( "Pre-1.00 file version found" ); |
786 | } |
787 | |
788 | unless ( $file_version == $this_file_version ) { |
789 | $self->storage->close; |
790 | DBM::Deep->_throw_error( |
791 | "Wrong file version found - " . $file_version . |
792 | " - expected " . $this_file_version |
793 | ); |
794 | } |
795 | |
796 | my $buffer2 = $self->storage->read_at( undef, $size ); |
797 | my @values = unpack( 'C C C C', $buffer2 ); |
798 | |
799 | if ( @values != 4 || grep { !defined } @values ) { |
800 | $self->storage->close; |
801 | DBM::Deep->_throw_error("Corrupted file - bad header"); |
802 | } |
803 | |
804 | #XXX Add warnings if values weren't set right |
805 | @{$self}{qw(byte_size max_buckets data_sector_size num_txns)} = @values; |
806 | |
807 | # These shenangians are to allow a 256 within a C |
808 | $self->{max_buckets} += 1; |
809 | $self->{data_sector_size} += 1; |
810 | |
811 | my $bl = $self->txn_bitfield_len; |
812 | |
813 | my $header_var = scalar(@values) + $bl + $STALE_SIZE * ($self->num_txns - 1) + 3 * $self->byte_size; |
814 | unless ( $size == $header_var ) { |
815 | $self->storage->close; |
816 | DBM::Deep->_throw_error( "Unexpected size found ($size <-> $header_var)." ); |
badf847c |
817 | } |
7b1e1aa1 |
818 | |
9c87a079 |
819 | $self->set_trans_loc( $header_fixed + scalar(@values) ); |
820 | $self->set_chains_loc( $header_fixed + scalar(@values) + $bl + $STALE_SIZE * ($self->num_txns - 1) ); |
821 | |
822 | return length($buffer) + length($buffer2); |
7b1e1aa1 |
823 | } |
75be6413 |
824 | } |
825 | |
ae6c15b8 |
826 | =head2 _apply_digest( @stuff ) |
827 | |
828 | This will apply the digest methd (default to Digest::MD5::md5) to the arguments |
829 | passed in and return the result. |
830 | |
831 | =cut |
832 | |
9c87a079 |
833 | sub _apply_digest { |
a8d2331c |
834 | my $self = shift; |
9c87a079 |
835 | return $self->{digest}->(@_); |
a8d2331c |
836 | } |
837 | |
ae6c15b8 |
838 | =head2 _add_free_blist_sector( $offset, $size ) |
839 | |
840 | =head2 _add_free_data_sector( $offset, $size ) |
841 | |
842 | =head2 _add_free_index_sector( $offset, $size ) |
843 | |
844 | These methods are all wrappers around _add_free_sector(), providing the proper |
845 | chain offset ($multiple) for the sector type. |
846 | |
847 | =cut |
848 | |
9c87a079 |
849 | sub _add_free_blist_sector { shift->_add_free_sector( 0, @_ ) } |
850 | sub _add_free_data_sector { shift->_add_free_sector( 1, @_ ) } |
851 | sub _add_free_index_sector { shift->_add_free_sector( 2, @_ ) } |
852 | |
ae6c15b8 |
853 | =head2 _add_free_sector( $multiple, $offset, $size ) |
854 | |
855 | _add_free_sector() takes the offset into the chains location, the offset of the |
856 | sector, and the size of that sector. It will mark the sector as a free sector |
857 | and put it into the list of sectors that are free of this type for use later. |
858 | |
859 | This returns nothing. |
860 | |
861 | B<NOTE>: $size is unused? |
862 | |
863 | =cut |
864 | |
9c87a079 |
865 | sub _add_free_sector { |
00d9bd0b |
866 | my $self = shift; |
9c87a079 |
867 | my ($multiple, $offset, $size) = @_; |
868 | |
869 | my $chains_offset = $multiple * $self->byte_size; |
870 | |
871 | my $storage = $self->storage; |
872 | |
873 | # Increment staleness. |
874 | # XXX Can this increment+modulo be done by "&= 0x1" ? |
51e9eee3 |
875 | my $staleness = unpack( $StP{$STALE_SIZE}, $storage->read_at( $offset + $self->SIG_SIZE, $STALE_SIZE ) ); |
9c87a079 |
876 | $staleness = ($staleness + 1 ) % ( 2 ** ( 8 * $STALE_SIZE ) ); |
51e9eee3 |
877 | $storage->print_at( $offset + $self->SIG_SIZE, pack( $StP{$STALE_SIZE}, $staleness ) ); |
9c87a079 |
878 | |
879 | my $old_head = $storage->read_at( $self->chains_loc + $chains_offset, $self->byte_size ); |
880 | |
881 | $storage->print_at( $self->chains_loc + $chains_offset, |
882 | pack( $StP{$self->byte_size}, $offset ), |
883 | ); |
884 | |
885 | # Record the old head in the new sector after the signature and staleness counter |
51e9eee3 |
886 | $storage->print_at( $offset + $self->SIG_SIZE + $STALE_SIZE, $old_head ); |
00d9bd0b |
887 | } |
888 | |
ae6c15b8 |
889 | =head2 _request_blist_sector( $size ) |
890 | |
891 | =head2 _request_data_sector( $size ) |
892 | |
893 | =head2 _request_index_sector( $size ) |
894 | |
895 | These methods are all wrappers around _request_sector(), providing the proper |
896 | chain offset ($multiple) for the sector type. |
897 | |
898 | =cut |
899 | |
9c87a079 |
900 | sub _request_blist_sector { shift->_request_sector( 0, @_ ) } |
901 | sub _request_data_sector { shift->_request_sector( 1, @_ ) } |
902 | sub _request_index_sector { shift->_request_sector( 2, @_ ) } |
903 | |
ae6c15b8 |
904 | =head2 _request_sector( $multiple $size ) |
905 | |
906 | This takes the offset into the chains location and the size of that sector. |
907 | |
908 | This returns the object with the sector. If there is an available free sector of |
909 | that type, then it will be reused. If there isn't one, then a new one will be |
910 | allocated. |
911 | |
912 | =cut |
913 | |
9c87a079 |
914 | sub _request_sector { |
a8d2331c |
915 | my $self = shift; |
9c87a079 |
916 | my ($multiple, $size) = @_; |
917 | |
918 | my $chains_offset = $multiple * $self->byte_size; |
919 | |
920 | my $old_head = $self->storage->read_at( $self->chains_loc + $chains_offset, $self->byte_size ); |
921 | my $loc = unpack( $StP{$self->byte_size}, $old_head ); |
922 | |
923 | # We don't have any free sectors of the right size, so allocate a new one. |
924 | unless ( $loc ) { |
925 | my $offset = $self->storage->request_space( $size ); |
926 | |
927 | # Zero out the new sector. This also guarantees correct increases |
928 | # in the filesize. |
929 | $self->storage->print_at( $offset, chr(0) x $size ); |
a8d2331c |
930 | |
9c87a079 |
931 | return $offset; |
932 | } |
933 | |
934 | # Read the new head after the signature and the staleness counter |
51e9eee3 |
935 | my $new_head = $self->storage->read_at( $loc + $self->SIG_SIZE + $STALE_SIZE, $self->byte_size ); |
9c87a079 |
936 | $self->storage->print_at( $self->chains_loc + $chains_offset, $new_head ); |
937 | $self->storage->print_at( |
51e9eee3 |
938 | $loc + $self->SIG_SIZE + $STALE_SIZE, |
9c87a079 |
939 | pack( $StP{$self->byte_size}, 0 ), |
940 | ); |
941 | |
942 | return $loc; |
a8d2331c |
943 | } |
944 | |
f0276afb |
945 | =head2 ACCESSORS |
946 | |
947 | The following are readonly attributes. |
948 | |
949 | =over 4 |
950 | |
951 | =item * storage |
952 | |
953 | =item * byte_size |
954 | |
955 | =item * hash_size |
956 | |
957 | =item * hash_chars |
958 | |
959 | =item * num_txns |
960 | |
961 | =item * max_buckets |
962 | |
963 | =item * blank_md5 |
964 | |
965 | =item * data_sector_size |
966 | |
967 | =item * txn_bitfield_len |
968 | |
969 | =back |
970 | |
971 | =cut |
f1879fdc |
972 | |
2120a181 |
973 | sub storage { $_[0]{storage} } |
974 | sub byte_size { $_[0]{byte_size} } |
975 | sub hash_size { $_[0]{hash_size} } |
976 | sub hash_chars { $_[0]{hash_chars} } |
977 | sub num_txns { $_[0]{num_txns} } |
978 | sub max_buckets { $_[0]{max_buckets} } |
979 | sub blank_md5 { chr(0) x $_[0]->hash_size } |
e9b0b5f0 |
980 | sub data_sector_size { $_[0]{data_sector_size} } |
981 | |
982 | # This is a calculated value |
983 | sub txn_bitfield_len { |
984 | my $self = shift; |
985 | unless ( exists $self->{txn_bitfield_len} ) { |
986 | my $temp = ($self->num_txns) / 8; |
987 | if ( $temp > int( $temp ) ) { |
988 | $temp = int( $temp ) + 1; |
989 | } |
990 | $self->{txn_bitfield_len} = $temp; |
991 | } |
992 | return $self->{txn_bitfield_len}; |
993 | } |
8db25060 |
994 | |
f0276afb |
995 | =pod |
996 | |
997 | The following are read/write attributes. |
998 | |
999 | =over 4 |
1000 | |
1001 | =item * trans_id / set_trans_id( $new_id ) |
1002 | |
1003 | =item * trans_loc / set_trans_loc( $new_loc ) |
1004 | |
1005 | =item * chains_loc / set_chains_loc( $new_loc ) |
1006 | |
1007 | =back |
1008 | |
1009 | =cut |
1010 | |
2120a181 |
1011 | sub trans_id { $_[0]{trans_id} } |
1012 | sub set_trans_id { $_[0]{trans_id} = $_[1] } |
8db25060 |
1013 | |
2120a181 |
1014 | sub trans_loc { $_[0]{trans_loc} } |
1015 | sub set_trans_loc { $_[0]{trans_loc} = $_[1] } |
1016 | |
1017 | sub chains_loc { $_[0]{chains_loc} } |
1018 | sub set_chains_loc { $_[0]{chains_loc} = $_[1] } |
1019 | |
c57b19c6 |
1020 | sub cache { $_[0]{cache} ||= {} } |
1021 | sub clear_cache { %{$_[0]->cache} = () } |
1022 | |
f0276afb |
1023 | =head2 _dump_file() |
1024 | |
3b90cc56 |
1025 | This method takes no arguments. It's used to print out a textual representation |
1026 | of the DBM::Deep DB file. It assumes the file is not-corrupted. |
f0276afb |
1027 | |
1028 | =cut |
1029 | |
888453b9 |
1030 | sub _dump_file { |
1031 | my $self = shift; |
1032 | |
1033 | # Read the header |
9c87a079 |
1034 | my $spot = $self->_read_file_header(); |
888453b9 |
1035 | |
1036 | my %types = ( |
1037 | 0 => 'B', |
1038 | 1 => 'D', |
1039 | 2 => 'I', |
1040 | ); |
1041 | |
1042 | my %sizes = ( |
1043 | 'D' => $self->data_sector_size, |
2c70efe1 |
1044 | 'B' => DBM::Deep::Sector::File::BucketList->new({engine=>$self,offset=>1})->size, |
1045 | 'I' => DBM::Deep::Sector::File::Index->new({engine=>$self,offset=>1})->size, |
888453b9 |
1046 | ); |
1047 | |
1048 | my $return = ""; |
c57b19c6 |
1049 | |
1050 | # Header values |
1051 | $return .= "NumTxns: " . $self->num_txns . $/; |
1052 | |
888453b9 |
1053 | # Read the free sector chains |
1054 | my %sectors; |
1055 | foreach my $multiple ( 0 .. 2 ) { |
1056 | $return .= "Chains($types{$multiple}):"; |
1057 | my $old_loc = $self->chains_loc + $multiple * $self->byte_size; |
1058 | while ( 1 ) { |
1059 | my $loc = unpack( |
1060 | $StP{$self->byte_size}, |
1061 | $self->storage->read_at( $old_loc, $self->byte_size ), |
1062 | ); |
1063 | |
1064 | # We're now out of free sectors of this kind. |
1065 | unless ( $loc ) { |
1066 | last; |
1067 | } |
1068 | |
1069 | $sectors{ $types{$multiple} }{ $loc } = undef; |
51e9eee3 |
1070 | $old_loc = $loc + $self->SIG_SIZE + $STALE_SIZE; |
888453b9 |
1071 | $return .= " $loc"; |
1072 | } |
1073 | $return .= $/; |
1074 | } |
1075 | |
1076 | SECTOR: |
1077 | while ( $spot < $self->storage->{end} ) { |
1078 | # Read each sector in order. |
2c70efe1 |
1079 | my $sector = DBM::Deep::Sector::File->load( $self, $spot ); |
888453b9 |
1080 | if ( !$sector ) { |
1081 | # Find it in the free-sectors that were found already |
1082 | foreach my $type ( keys %sectors ) { |
1083 | if ( exists $sectors{$type}{$spot} ) { |
1084 | my $size = $sizes{$type}; |
1085 | $return .= sprintf "%08d: %s %04d\n", $spot, 'F' . $type, $size; |
1086 | $spot += $size; |
1087 | next SECTOR; |
1088 | } |
1089 | } |
1090 | |
1091 | die "********\n$return\nDidn't find free sector for $spot in chains\n********\n"; |
1092 | } |
1093 | else { |
1094 | $return .= sprintf "%08d: %s %04d", $spot, $sector->type, $sector->size; |
1095 | if ( $sector->type eq 'D' ) { |
1096 | $return .= ' ' . $sector->data; |
1097 | } |
1098 | elsif ( $sector->type eq 'A' || $sector->type eq 'H' ) { |
1099 | $return .= ' REF: ' . $sector->get_refcount; |
1100 | } |
1101 | elsif ( $sector->type eq 'B' ) { |
1102 | foreach my $bucket ( $sector->chopped_up ) { |
1103 | $return .= "\n "; |
1104 | $return .= sprintf "%08d", unpack($StP{$self->byte_size}, |
1105 | substr( $bucket->[-1], $self->hash_size, $self->byte_size), |
1106 | ); |
c57b19c6 |
1107 | my $l = unpack( $StP{$self->byte_size}, |
1108 | substr( $bucket->[-1], |
1109 | $self->hash_size + $self->byte_size, |
1110 | $self->byte_size, |
1111 | ), |
1112 | ); |
1113 | $return .= sprintf " %08d", $l; |
1114 | foreach my $txn ( 0 .. $self->num_txns - 2 ) { |
888453b9 |
1115 | my $l = unpack( $StP{$self->byte_size}, |
1116 | substr( $bucket->[-1], |
c57b19c6 |
1117 | $self->hash_size + 2 * $self->byte_size + $txn * ($self->byte_size + $STALE_SIZE), |
888453b9 |
1118 | $self->byte_size, |
1119 | ), |
1120 | ); |
1121 | $return .= sprintf " %08d", $l; |
1122 | } |
1123 | } |
1124 | } |
1125 | $return .= $/; |
1126 | |
1127 | $spot += $sector->size; |
1128 | } |
1129 | } |
1130 | |
1131 | return $return; |
1132 | } |
1133 | |
a20d9a3f |
1134 | 1; |
1135 | __END__ |