Commit | Line | Data |
a20d9a3f |
1 | package DBM::Deep::Engine; |
2 | |
460b1067 |
3 | use 5.6.0; |
4 | |
a20d9a3f |
5 | use strict; |
460b1067 |
6 | use warnings; |
a20d9a3f |
7 | |
8 | use Fcntl qw( :DEFAULT :flock :seek ); |
9 | |
21838116 |
10 | # File-wide notes: |
11 | # * All the local($/,$\); are to protect read() and print() from -l. |
12 | |
8db25060 |
13 | ## |
14 | # Setup file and tag signatures. These should never change. |
15 | ## |
16 | sub SIG_FILE () { 'DPDB' } |
460b1067 |
17 | sub SIG_HEADER () { 'h' } |
8db25060 |
18 | sub SIG_INTERNAL () { 'i' } |
19 | sub SIG_HASH () { 'H' } |
20 | sub SIG_ARRAY () { 'A' } |
8db25060 |
21 | sub SIG_NULL () { 'N' } |
22 | sub SIG_DATA () { 'D' } |
23 | sub SIG_INDEX () { 'I' } |
24 | sub SIG_BLIST () { 'B' } |
7b1e1aa1 |
25 | sub SIG_FREE () { 'F' } |
8db25060 |
26 | sub SIG_SIZE () { 1 } |
27 | |
612969fb |
28 | sub new { |
29 | my $class = shift; |
30 | my ($args) = @_; |
31 | |
32 | my $self = bless { |
33 | long_size => 4, |
34 | long_pack => 'N', |
35 | data_size => 4, |
36 | data_pack => 'N', |
251dfd0e |
37 | |
612969fb |
38 | digest => \&Digest::MD5::md5, |
39 | hash_size => 16, |
251dfd0e |
40 | |
81d16922 |
41 | ## |
d5d7c51d |
42 | # Maximum number of buckets per list before another level of indexing is |
e0098e7f |
43 | # done. Increase this value for slightly greater speed, but larger database |
d5d7c51d |
44 | # files. DO NOT decrease this value below 16, due to risk of recursive |
45 | # reindex overrun. |
81d16922 |
46 | ## |
612969fb |
47 | max_buckets => 16, |
460b1067 |
48 | |
49 | fileobj => undef, |
612969fb |
50 | }, $class; |
51 | |
e0098e7f |
52 | if ( defined $args->{pack_size} ) { |
53 | if ( lc $args->{pack_size} eq 'small' ) { |
54 | $args->{long_size} = 2; |
55 | $args->{long_pack} = 'S'; |
56 | } |
57 | elsif ( lc $args->{pack_size} eq 'medium' ) { |
58 | $args->{long_size} = 4; |
59 | $args->{long_pack} = 'N'; |
60 | } |
61 | elsif ( lc $args->{pack_size} eq 'large' ) { |
62 | $args->{long_size} = 8; |
63 | $args->{long_pack} = 'Q'; |
64 | } |
65 | else { |
66 | die "Unknown pack_size value: '$args->{pack_size}'\n"; |
67 | } |
68 | } |
69 | |
fde3db1a |
70 | # Grab the parameters we want to use |
71 | foreach my $param ( keys %$self ) { |
72 | next unless exists $args->{$param}; |
3e9498a1 |
73 | $self->{$param} = $args->{$param}; |
fde3db1a |
74 | } |
75 | |
e0098e7f |
76 | if ( $self->{max_buckets} < 16 ) { |
77 | warn "Floor of max_buckets is 16. Setting it to 16 from '$self->{max_buckets}'\n"; |
78 | $self->{max_buckets} = 16; |
79 | } |
80 | |
260a80b4 |
81 | return $self; |
82 | } |
83 | |
460b1067 |
84 | sub _fileobj { return $_[0]{fileobj} } |
85 | sub _fh { return $_[0]->_fileobj->{fh} } |
86 | |
260a80b4 |
87 | sub calculate_sizes { |
88 | my $self = shift; |
89 | |
28394a1a |
90 | #XXX Does this need to be updated with different hashing algorithms? |
e0098e7f |
91 | $self->{index_size} = (2**8) * $self->{long_size}; |
28394a1a |
92 | $self->{bucket_size} = $self->{hash_size} + $self->{long_size} * 3; |
e0098e7f |
93 | $self->{bucket_list_size} = $self->{max_buckets} * $self->{bucket_size}; |
612969fb |
94 | |
260a80b4 |
95 | return; |
1bf65be7 |
96 | } |
97 | |
fde3db1a |
98 | sub write_file_header { |
0d0f3d5d |
99 | my $self = shift; |
0d0f3d5d |
100 | |
21838116 |
101 | local($/,$\); |
102 | |
460b1067 |
103 | my $fh = $self->_fh; |
0d0f3d5d |
104 | |
e96daec8 |
105 | my $loc = $self->_request_space( length( SIG_FILE ) + 21 ); |
460b1067 |
106 | seek($fh, $loc + $self->_fileobj->{file_offset}, SEEK_SET); |
260a80b4 |
107 | print( $fh |
108 | SIG_FILE, |
460b1067 |
109 | SIG_HEADER, |
110 | pack('N', 1), # header version |
111 | pack('N', 12), # header size |
112 | pack('N', 0), # file version |
260a80b4 |
113 | pack('S', $self->{long_size}), |
114 | pack('A', $self->{long_pack}), |
115 | pack('S', $self->{data_size}), |
116 | pack('A', $self->{data_pack}), |
117 | pack('S', $self->{max_buckets}), |
118 | ); |
0d0f3d5d |
119 | |
120 | return; |
121 | } |
122 | |
fde3db1a |
123 | sub read_file_header { |
e064ccd1 |
124 | my $self = shift; |
e064ccd1 |
125 | |
21838116 |
126 | local($/,$\); |
127 | |
e96daec8 |
128 | my $fh = $self->_fh; |
e064ccd1 |
129 | |
e96daec8 |
130 | seek($fh, 0 + $self->_fileobj->{file_offset}, SEEK_SET); |
42f79e07 |
131 | my $buffer; |
460b1067 |
132 | my $bytes_read = read( $fh, $buffer, length(SIG_FILE) + 9 ); |
133 | |
134 | return unless $bytes_read; |
135 | |
136 | my ($file_signature, $sig_header, $header_version, $size) = unpack( |
137 | 'A4 A N N', $buffer |
42f79e07 |
138 | ); |
e064ccd1 |
139 | |
460b1067 |
140 | unless ( $file_signature eq SIG_FILE ) { |
141 | $self->{fileobj}->close; |
e96daec8 |
142 | $self->_throw_error( "Signature not found -- file is not a Deep DB" ); |
460b1067 |
143 | } |
260a80b4 |
144 | |
460b1067 |
145 | unless ( $sig_header eq SIG_HEADER ) { |
146 | $self->{fileobj}->close; |
e96daec8 |
147 | $self->_throw_error( "Old file version found." ); |
460b1067 |
148 | } |
9b2370e0 |
149 | |
460b1067 |
150 | my $buffer2; |
151 | $bytes_read += read( $fh, $buffer2, $size ); |
152 | my ($file_version, @values) = unpack( 'N S A S A S', $buffer2 ); |
153 | if ( @values < 5 || grep { !defined } @values ) { |
154 | $self->{fileobj}->close; |
e96daec8 |
155 | $self->_throw_error("Corrupted file - bad header"); |
e064ccd1 |
156 | } |
157 | |
460b1067 |
158 | #XXX Add warnings if values weren't set right |
159 | @{$self}{qw(long_size long_pack data_size data_pack max_buckets)} = @values; |
160 | |
e064ccd1 |
161 | return $bytes_read; |
162 | } |
163 | |
460b1067 |
164 | sub setup_fh { |
165 | my $self = shift; |
166 | my ($obj) = @_; |
70b55428 |
167 | |
e96daec8 |
168 | my $fh = $self->_fh; |
6fde4ed2 |
169 | flock $fh, LOCK_EX; |
118ba343 |
170 | |
260a80b4 |
171 | #XXX The duplication of calculate_sizes needs to go away |
6fde4ed2 |
172 | unless ( $obj->{base_offset} ) { |
e96daec8 |
173 | my $bytes_read = $self->read_file_header; |
118ba343 |
174 | |
260a80b4 |
175 | $self->calculate_sizes; |
176 | |
118ba343 |
177 | ## |
fde3db1a |
178 | # File is empty -- write header and master index |
118ba343 |
179 | ## |
180 | if (!$bytes_read) { |
e96daec8 |
181 | $self->write_file_header; |
118ba343 |
182 | |
e96daec8 |
183 | $obj->{base_offset} = $self->_request_space( $self->tag_size( $self->{index_size} ) ); |
118ba343 |
184 | |
9e4f83a0 |
185 | $self->write_tag( |
e96daec8 |
186 | $obj->_base_offset, $obj->_type, |
f37c15ab |
187 | chr(0)x$self->{index_size}, |
118ba343 |
188 | ); |
189 | |
190 | # Flush the filehandle |
191 | my $old_fh = select $fh; |
192 | my $old_af = $|; $| = 1; $| = $old_af; |
193 | select $old_fh; |
194 | } |
195 | else { |
196 | $obj->{base_offset} = $bytes_read; |
197 | |
198 | ## |
fde3db1a |
199 | # Get our type from master index header |
118ba343 |
200 | ## |
e96daec8 |
201 | my $tag = $self->load_tag($obj->_base_offset) |
202 | or $self->_throw_error("Corrupted file, no master index record"); |
118ba343 |
203 | |
e96daec8 |
204 | unless ($obj->_type eq $tag->{signature}) { |
205 | $self->_throw_error("File type mismatch"); |
118ba343 |
206 | } |
207 | } |
118ba343 |
208 | } |
260a80b4 |
209 | else { |
210 | $self->calculate_sizes; |
211 | } |
e06824f8 |
212 | |
673464d9 |
213 | #XXX We have to make sure we don't mess up when autoflush isn't turned on |
e96daec8 |
214 | unless ( $self->_fileobj->{inode} ) { |
215 | my @stats = stat($fh); |
216 | $self->_fileobj->{inode} = $stats[1]; |
217 | $self->_fileobj->{end} = $stats[7]; |
70b55428 |
218 | } |
219 | |
6fde4ed2 |
220 | flock $fh, LOCK_UN; |
221 | |
70b55428 |
222 | return 1; |
223 | } |
224 | |
16d1ad9b |
225 | sub tag_size { |
226 | my $self = shift; |
227 | my ($size) = @_; |
228 | return SIG_SIZE + $self->{data_size} + $size; |
229 | } |
230 | |
9e4f83a0 |
231 | sub write_tag { |
20f7b20c |
232 | ## |
233 | # Given offset, signature and content, create tag and write to disk |
234 | ## |
d4b1166e |
235 | my $self = shift; |
e96daec8 |
236 | my ($offset, $sig, $content) = @_; |
f37c15ab |
237 | my $size = length( $content ); |
20f7b20c |
238 | |
21838116 |
239 | local($/,$\); |
240 | |
e96daec8 |
241 | my $fh = $self->_fh; |
d4b1166e |
242 | |
f37c15ab |
243 | if ( defined $offset ) { |
e96daec8 |
244 | seek($fh, $offset + $self->_fileobj->{file_offset}, SEEK_SET); |
f37c15ab |
245 | } |
246 | |
251dfd0e |
247 | print( $fh $sig . pack($self->{data_pack}, $size) . $content ); |
20f7b20c |
248 | |
f37c15ab |
249 | return unless defined $offset; |
250 | |
20f7b20c |
251 | return { |
252 | signature => $sig, |
253 | size => $size, |
8db25060 |
254 | offset => $offset + SIG_SIZE + $self->{data_size}, |
20f7b20c |
255 | content => $content |
256 | }; |
d4b1166e |
257 | } |
258 | |
259 | sub load_tag { |
20f7b20c |
260 | ## |
261 | # Given offset, load single tag and return signature, size and data |
262 | ## |
d4b1166e |
263 | my $self = shift; |
e96daec8 |
264 | my ($offset) = @_; |
20f7b20c |
265 | |
21838116 |
266 | local($/,$\); |
267 | |
e06824f8 |
268 | # print join(':',map{$_||''}caller(1)), $/; |
269 | |
e96daec8 |
270 | my $fh = $self->_fh; |
d4b1166e |
271 | |
e96daec8 |
272 | seek($fh, $offset + $self->_fileobj->{file_offset}, SEEK_SET); |
e5fc7e69 |
273 | |
75be6413 |
274 | #XXX I'm not sure this check will work if autoflush isn't enabled ... |
e5fc7e69 |
275 | return if eof $fh; |
20f7b20c |
276 | |
d4b1166e |
277 | my $b; |
8db25060 |
278 | read( $fh, $b, SIG_SIZE + $self->{data_size} ); |
251dfd0e |
279 | my ($sig, $size) = unpack( "A $self->{data_pack}", $b ); |
20f7b20c |
280 | |
281 | my $buffer; |
282 | read( $fh, $buffer, $size); |
283 | |
284 | return { |
285 | signature => $sig, |
286 | size => $size, |
8db25060 |
287 | offset => $offset + SIG_SIZE + $self->{data_size}, |
20f7b20c |
288 | content => $buffer |
289 | }; |
d4b1166e |
290 | } |
291 | |
56ec4340 |
292 | sub _get_dbm_object { |
293 | my $item = shift; |
294 | |
295 | my $obj = eval { |
296 | local $SIG{__DIE__}; |
297 | if ($item->isa( 'DBM::Deep' )) { |
298 | return $item; |
299 | } |
300 | return; |
301 | }; |
302 | return $obj if $obj; |
303 | |
304 | my $r = Scalar::Util::reftype( $item ) || ''; |
305 | if ( $r eq 'HASH' ) { |
306 | my $obj = eval { |
307 | local $SIG{__DIE__}; |
308 | my $obj = tied(%$item); |
309 | if ($obj->isa( 'DBM::Deep' )) { |
310 | return $obj; |
311 | } |
312 | return; |
313 | }; |
314 | return $obj if $obj; |
315 | } |
316 | elsif ( $r eq 'ARRAY' ) { |
317 | my $obj = eval { |
318 | local $SIG{__DIE__}; |
319 | my $obj = tied(@$item); |
320 | if ($obj->isa( 'DBM::Deep' )) { |
321 | return $obj; |
322 | } |
323 | return; |
324 | }; |
325 | return $obj if $obj; |
326 | } |
327 | |
328 | return; |
329 | } |
330 | |
29b01632 |
331 | sub _length_needed { |
332 | my $self = shift; |
e96daec8 |
333 | my ($value, $key) = @_; |
29b01632 |
334 | |
335 | my $is_dbm_deep = eval { |
336 | local $SIG{'__DIE__'}; |
337 | $value->isa( 'DBM::Deep' ); |
338 | }; |
339 | |
f37c15ab |
340 | my $len = SIG_SIZE + $self->{data_size} |
341 | + $self->{data_size} + length( $key ); |
29b01632 |
342 | |
e96daec8 |
343 | if ( $is_dbm_deep && $value->_fileobj eq $self->_fileobj ) { |
f37c15ab |
344 | return $len + $self->{long_size}; |
29b01632 |
345 | } |
346 | |
347 | my $r = Scalar::Util::reftype( $value ) || ''; |
e96daec8 |
348 | if ( $self->_fileobj->{autobless} ) { |
9a187d8c |
349 | # This is for the bit saying whether or not this thing is blessed. |
350 | $len += 1; |
351 | } |
352 | |
29b01632 |
353 | unless ( $r eq 'HASH' || $r eq 'ARRAY' ) { |
f37c15ab |
354 | if ( defined $value ) { |
355 | $len += length( $value ); |
356 | } |
357 | return $len; |
29b01632 |
358 | } |
359 | |
f37c15ab |
360 | $len += $self->{index_size}; |
29b01632 |
361 | |
362 | # if autobless is enabled, must also take into consideration |
f37c15ab |
363 | # the class name as it is stored after the key. |
e96daec8 |
364 | if ( $self->_fileobj->{autobless} ) { |
56ec4340 |
365 | my $c = Scalar::Util::blessed($value); |
366 | if ( defined $c && !$is_dbm_deep ) { |
367 | $len += $self->{data_size} + length($c); |
29b01632 |
368 | } |
369 | } |
370 | |
f37c15ab |
371 | return $len; |
29b01632 |
372 | } |
373 | |
20f7b20c |
374 | sub add_bucket { |
375 | ## |
376 | # Adds one key/value pair to bucket list, given offset, MD5 digest of key, |
377 | # plain (undigested) key and value. |
378 | ## |
d4b1166e |
379 | my $self = shift; |
e96daec8 |
380 | my ($tag, $md5, $plain_key, $value) = @_; |
75be6413 |
381 | |
21838116 |
382 | local($/,$\); |
383 | |
eea0d863 |
384 | # This verifies that only supported values will be stored. |
385 | { |
386 | my $r = Scalar::Util::reftype( $value ); |
387 | last if !defined $r; |
388 | |
389 | last if $r eq 'HASH'; |
390 | last if $r eq 'ARRAY'; |
391 | |
e96daec8 |
392 | $self->_throw_error( |
eea0d863 |
393 | "Storage of variables of type '$r' is not supported." |
394 | ); |
395 | } |
396 | |
20f7b20c |
397 | my $location = 0; |
398 | my $result = 2; |
399 | |
e96daec8 |
400 | my $root = $self->_fileobj; |
401 | my $fh = $self->_fh; |
20f7b20c |
402 | |
e96daec8 |
403 | my $actual_length = $self->_length_needed( $value, $plain_key ); |
20f7b20c |
404 | |
21838116 |
405 | #ACID - This is a mutation. Must only find the exact transaction |
406 | my ($subloc, $offset, $size) = $self->_find_in_buckets( $tag, $md5, 1 ); |
75be6413 |
407 | |
e96daec8 |
408 | # $self->_release_space( $size, $subloc ); |
386bab6c |
409 | # Updating a known md5 |
f9c33187 |
410 | #XXX This needs updating to use _release_space |
386bab6c |
411 | if ( $subloc ) { |
412 | $result = 1; |
20f7b20c |
413 | |
386bab6c |
414 | if ($actual_length <= $size) { |
415 | $location = $subloc; |
20f7b20c |
416 | } |
75be6413 |
417 | else { |
e96daec8 |
418 | $location = $self->_request_space( $actual_length ); |
386bab6c |
419 | seek( |
420 | $fh, |
9a187d8c |
421 | $tag->{offset} + $offset |
422 | + $self->{hash_size} + $root->{file_offset}, |
386bab6c |
423 | SEEK_SET, |
424 | ); |
9a187d8c |
425 | print( $fh pack($self->{long_pack}, $location ) ); |
426 | print( $fh pack($self->{long_pack}, $actual_length ) ); |
28394a1a |
427 | print( $fh pack($self->{long_pack}, $root->transaction_id ) ); |
75be6413 |
428 | } |
75be6413 |
429 | } |
386bab6c |
430 | # Adding a new md5 |
431 | elsif ( defined $offset ) { |
e96daec8 |
432 | $location = $self->_request_space( $actual_length ); |
386bab6c |
433 | |
434 | seek( $fh, $tag->{offset} + $offset + $root->{file_offset}, SEEK_SET ); |
9a187d8c |
435 | print( $fh $md5 . pack($self->{long_pack}, $location ) ); |
436 | print( $fh pack($self->{long_pack}, $actual_length ) ); |
28394a1a |
437 | print( $fh pack($self->{long_pack}, $root->transaction_id ) ); |
386bab6c |
438 | } |
439 | # If bucket didn't fit into list, split into a new index level |
f9c33187 |
440 | # split_index() will do the _request_space() call |
386bab6c |
441 | else { |
e96daec8 |
442 | $location = $self->split_index( $md5, $tag ); |
386bab6c |
443 | } |
20f7b20c |
444 | |
e96daec8 |
445 | $self->write_value( $location, $plain_key, $value ); |
d5d7c51d |
446 | |
447 | return $result; |
448 | } |
449 | |
450 | sub write_value { |
451 | my $self = shift; |
e96daec8 |
452 | my ($location, $key, $value) = @_; |
d5d7c51d |
453 | |
21838116 |
454 | local($/,$\); |
455 | |
e96daec8 |
456 | my $fh = $self->_fh; |
457 | my $root = $self->_fileobj; |
d5d7c51d |
458 | |
9d4fa373 |
459 | my $dbm_deep_obj = _get_dbm_object( $value ); |
e96daec8 |
460 | if ( $dbm_deep_obj && $dbm_deep_obj->_fileobj ne $self->_fileobj ) { |
461 | $self->_throw_error( "Cannot cross-reference. Use export() instead" ); |
9d4fa373 |
462 | } |
d5d7c51d |
463 | |
464 | seek($fh, $location + $root->{file_offset}, SEEK_SET); |
465 | |
20f7b20c |
466 | ## |
d5d7c51d |
467 | # Write signature based on content type, set content length and write |
468 | # actual value. |
20f7b20c |
469 | ## |
9d4fa373 |
470 | my $r = Scalar::Util::reftype( $value ) || ''; |
471 | if ( $dbm_deep_obj ) { |
e96daec8 |
472 | $self->write_tag( undef, SIG_INTERNAL,pack($self->{long_pack}, $dbm_deep_obj->_base_offset) ); |
f37c15ab |
473 | } |
474 | elsif ($r eq 'HASH') { |
9d4fa373 |
475 | if ( !$dbm_deep_obj && tied %{$value} ) { |
e96daec8 |
476 | $self->_throw_error( "Cannot store something that is tied" ); |
019ab3a1 |
477 | } |
e96daec8 |
478 | $self->write_tag( undef, SIG_HASH, chr(0)x$self->{index_size} ); |
f37c15ab |
479 | } |
480 | elsif ($r eq 'ARRAY') { |
9d4fa373 |
481 | if ( !$dbm_deep_obj && tied @{$value} ) { |
e96daec8 |
482 | $self->_throw_error( "Cannot store something that is tied" ); |
019ab3a1 |
483 | } |
e96daec8 |
484 | $self->write_tag( undef, SIG_ARRAY, chr(0)x$self->{index_size} ); |
f37c15ab |
485 | } |
486 | elsif (!defined($value)) { |
e96daec8 |
487 | $self->write_tag( undef, SIG_NULL, '' ); |
d5d7c51d |
488 | } |
489 | else { |
e96daec8 |
490 | $self->write_tag( undef, SIG_DATA, $value ); |
d5d7c51d |
491 | } |
20f7b20c |
492 | |
d5d7c51d |
493 | ## |
494 | # Plain key is stored AFTER value, as keys are typically fetched less often. |
495 | ## |
496 | print( $fh pack($self->{data_pack}, length($key)) . $key ); |
20f7b20c |
497 | |
9a187d8c |
498 | # Internal references don't care about autobless |
9d4fa373 |
499 | return 1 if $dbm_deep_obj; |
9a187d8c |
500 | |
d5d7c51d |
501 | ## |
502 | # If value is blessed, preserve class name |
503 | ## |
504 | if ( $root->{autobless} ) { |
56ec4340 |
505 | my $c = Scalar::Util::blessed($value); |
506 | if ( defined $c && !$dbm_deep_obj ) { |
d5d7c51d |
507 | print( $fh chr(1) ); |
56ec4340 |
508 | print( $fh pack($self->{data_pack}, length($c)) . $c ); |
20f7b20c |
509 | } |
d5d7c51d |
510 | else { |
511 | print( $fh chr(0) ); |
20f7b20c |
512 | } |
d5d7c51d |
513 | } |
20f7b20c |
514 | |
d5d7c51d |
515 | ## |
56ec4340 |
516 | # Tie the passed in reference so that changes to it are reflected in the |
517 | # datafile. The use of $location as the base_offset will act as the |
518 | # the linkage between parent and child. |
519 | # |
520 | # The overall assignment is a hack around the fact that just tying doesn't |
521 | # store the values. This may not be the wrong thing to do. |
d5d7c51d |
522 | ## |
9d4fa373 |
523 | if ($r eq 'HASH') { |
524 | my %x = %$value; |
525 | tie %$value, 'DBM::Deep', { |
526 | base_offset => $location, |
460b1067 |
527 | fileobj => $root, |
9d4fa373 |
528 | }; |
529 | %$value = %x; |
530 | } |
531 | elsif ($r eq 'ARRAY') { |
532 | my @x = @$value; |
533 | tie @$value, 'DBM::Deep', { |
534 | base_offset => $location, |
460b1067 |
535 | fileobj => $root, |
9d4fa373 |
536 | }; |
537 | @$value = @x; |
20f7b20c |
538 | } |
d4b1166e |
539 | |
d5d7c51d |
540 | return 1; |
d4b1166e |
541 | } |
542 | |
75be6413 |
543 | sub split_index { |
544 | my $self = shift; |
e96daec8 |
545 | my ($md5, $tag) = @_; |
75be6413 |
546 | |
21838116 |
547 | local($/,$\); |
548 | |
e96daec8 |
549 | my $fh = $self->_fh; |
550 | my $root = $self->_fileobj; |
16d1ad9b |
551 | |
552 | my $loc = $self->_request_space( |
e96daec8 |
553 | $self->tag_size( $self->{index_size} ), |
16d1ad9b |
554 | ); |
555 | |
7b1e1aa1 |
556 | seek($fh, $tag->{ref_loc} + $root->{file_offset}, SEEK_SET); |
16d1ad9b |
557 | print( $fh pack($self->{long_pack}, $loc) ); |
75be6413 |
558 | |
9e4f83a0 |
559 | my $index_tag = $self->write_tag( |
e96daec8 |
560 | $loc, SIG_INDEX, |
f37c15ab |
561 | chr(0)x$self->{index_size}, |
75be6413 |
562 | ); |
563 | |
f9c33187 |
564 | my $newtag_loc = $self->_request_space( |
e96daec8 |
565 | $self->tag_size( $self->{bucket_list_size} ), |
f9c33187 |
566 | ); |
75be6413 |
567 | |
7b1e1aa1 |
568 | my $keys = $tag->{content} |
f9c33187 |
569 | . $md5 . pack($self->{long_pack}, $newtag_loc) |
28394a1a |
570 | . pack($self->{long_pack}, 0) # size |
571 | . pack($self->{long_pack}, 0); # transaction # |
75be6413 |
572 | |
f9c33187 |
573 | my @newloc = (); |
75be6413 |
574 | BUCKET: |
575 | for (my $i = 0; $i <= $self->{max_buckets}; $i++) { |
9a187d8c |
576 | my ($key, $old_subloc, $size) = $self->_get_key_subloc( $keys, $i ); |
75be6413 |
577 | |
f9c33187 |
578 | die "[INTERNAL ERROR]: No key in split_index()\n" unless $key; |
579 | die "[INTERNAL ERROR]: No subloc in split_index()\n" unless $old_subloc; |
75be6413 |
580 | |
75be6413 |
581 | my $num = ord(substr($key, $tag->{ch} + 1, 1)); |
582 | |
f9c33187 |
583 | if ($newloc[$num]) { |
584 | seek($fh, $newloc[$num] + $root->{file_offset}, SEEK_SET); |
75be6413 |
585 | my $subkeys; |
586 | read( $fh, $subkeys, $self->{bucket_list_size}); |
587 | |
f9c33187 |
588 | # This is looking for the first empty spot |
7b1e1aa1 |
589 | my ($subloc, $offset, $size) = $self->_find_in_buckets( |
f9c33187 |
590 | { content => $subkeys }, '', |
7b1e1aa1 |
591 | ); |
75be6413 |
592 | |
f9c33187 |
593 | seek($fh, $newloc[$num] + $offset + $root->{file_offset}, SEEK_SET); |
594 | print( $fh $key . pack($self->{long_pack}, $old_subloc) ); |
7b1e1aa1 |
595 | |
596 | next; |
75be6413 |
597 | } |
75be6413 |
598 | |
7b1e1aa1 |
599 | seek($fh, $index_tag->{offset} + ($num * $self->{long_size}) + $root->{file_offset}, SEEK_SET); |
2603d86e |
600 | |
7b1e1aa1 |
601 | my $loc = $self->_request_space( |
e96daec8 |
602 | $self->tag_size( $self->{bucket_list_size} ), |
7b1e1aa1 |
603 | ); |
2603d86e |
604 | |
7b1e1aa1 |
605 | print( $fh pack($self->{long_pack}, $loc) ); |
75be6413 |
606 | |
7b1e1aa1 |
607 | my $blist_tag = $self->write_tag( |
e96daec8 |
608 | $loc, SIG_BLIST, |
7b1e1aa1 |
609 | chr(0)x$self->{bucket_list_size}, |
610 | ); |
611 | |
612 | seek($fh, $blist_tag->{offset} + $root->{file_offset}, SEEK_SET); |
f9c33187 |
613 | print( $fh $key . pack($self->{long_pack}, $old_subloc) ); |
7b1e1aa1 |
614 | |
f9c33187 |
615 | $newloc[$num] = $blist_tag->{offset}; |
7b1e1aa1 |
616 | } |
617 | |
618 | $self->_release_space( |
e96daec8 |
619 | $self->tag_size( $self->{bucket_list_size} ), |
7b1e1aa1 |
620 | $tag->{offset} - SIG_SIZE - $self->{data_size}, |
621 | ); |
75be6413 |
622 | |
f9c33187 |
623 | return $newtag_loc; |
75be6413 |
624 | } |
625 | |
8db25060 |
626 | sub read_from_loc { |
627 | my $self = shift; |
e96daec8 |
628 | my ($subloc) = @_; |
8db25060 |
629 | |
21838116 |
630 | local($/,$\); |
631 | |
e96daec8 |
632 | my $fh = $self->_fh; |
8db25060 |
633 | |
634 | ## |
635 | # Found match -- seek to offset and read signature |
636 | ## |
637 | my $signature; |
e96daec8 |
638 | seek($fh, $subloc + $self->_fileobj->{file_offset}, SEEK_SET); |
8db25060 |
639 | read( $fh, $signature, SIG_SIZE); |
640 | |
641 | ## |
642 | # If value is a hash or array, return new DBM::Deep object with correct offset |
643 | ## |
644 | if (($signature eq SIG_HASH) || ($signature eq SIG_ARRAY)) { |
685e40f1 |
645 | my $new_obj = DBM::Deep->new({ |
8db25060 |
646 | type => $signature, |
647 | base_offset => $subloc, |
e96daec8 |
648 | fileobj => $self->_fileobj, |
685e40f1 |
649 | }); |
8db25060 |
650 | |
460b1067 |
651 | if ($new_obj->_fileobj->{autobless}) { |
8db25060 |
652 | ## |
653 | # Skip over value and plain key to see if object needs |
654 | # to be re-blessed |
655 | ## |
656 | seek($fh, $self->{data_size} + $self->{index_size}, SEEK_CUR); |
657 | |
658 | my $size; |
c6ea6b6c |
659 | read( $fh, $size, $self->{data_size}); |
660 | $size = unpack($self->{data_pack}, $size); |
8db25060 |
661 | if ($size) { seek($fh, $size, SEEK_CUR); } |
662 | |
663 | my $bless_bit; |
664 | read( $fh, $bless_bit, 1); |
665 | if (ord($bless_bit)) { |
666 | ## |
667 | # Yes, object needs to be re-blessed |
668 | ## |
669 | my $class_name; |
c6ea6b6c |
670 | read( $fh, $size, $self->{data_size}); |
671 | $size = unpack($self->{data_pack}, $size); |
8db25060 |
672 | if ($size) { read( $fh, $class_name, $size); } |
685e40f1 |
673 | if ($class_name) { $new_obj = bless( $new_obj, $class_name ); } |
8db25060 |
674 | } |
675 | } |
676 | |
685e40f1 |
677 | return $new_obj; |
8db25060 |
678 | } |
679 | elsif ( $signature eq SIG_INTERNAL ) { |
680 | my $size; |
681 | read( $fh, $size, $self->{data_size}); |
682 | $size = unpack($self->{data_pack}, $size); |
683 | |
684 | if ( $size ) { |
685 | my $new_loc; |
686 | read( $fh, $new_loc, $size ); |
687 | $new_loc = unpack( $self->{long_pack}, $new_loc ); |
688 | |
e96daec8 |
689 | return $self->read_from_loc( $new_loc ); |
8db25060 |
690 | } |
691 | else { |
692 | return; |
693 | } |
694 | } |
695 | ## |
696 | # Otherwise return actual value |
697 | ## |
460b1067 |
698 | elsif ( $signature eq SIG_DATA ) { |
8db25060 |
699 | my $size; |
700 | read( $fh, $size, $self->{data_size}); |
701 | $size = unpack($self->{data_pack}, $size); |
702 | |
703 | my $value = ''; |
704 | if ($size) { read( $fh, $value, $size); } |
705 | return $value; |
706 | } |
707 | |
708 | ## |
709 | # Key exists, but content is null |
710 | ## |
711 | return; |
712 | } |
713 | |
9020ee8c |
714 | sub get_bucket_value { |
beac1dff |
715 | ## |
716 | # Fetch single value given tag and MD5 digested key. |
717 | ## |
718 | my $self = shift; |
e96daec8 |
719 | my ($tag, $md5) = @_; |
9020ee8c |
720 | |
21838116 |
721 | #ACID - This is a read. Can find exact or HEAD |
9a187d8c |
722 | my ($subloc, $offset, $size) = $self->_find_in_buckets( $tag, $md5 ); |
386bab6c |
723 | if ( $subloc ) { |
e96daec8 |
724 | return $self->read_from_loc( $subloc ); |
386bab6c |
725 | } |
beac1dff |
726 | return; |
9020ee8c |
727 | } |
ab0e4957 |
728 | |
729 | sub delete_bucket { |
beac1dff |
730 | ## |
731 | # Delete single key/value pair given tag and MD5 digested key. |
732 | ## |
733 | my $self = shift; |
e96daec8 |
734 | my ($tag, $md5) = @_; |
ab0e4957 |
735 | |
21838116 |
736 | local($/,$\); |
737 | |
738 | #ACID - This is a mutation. Must only find the exact transaction |
739 | my ($subloc, $offset, $size) = $self->_find_in_buckets( $tag, $md5, 1 ); |
f9c33187 |
740 | #XXX This needs _release_space() |
386bab6c |
741 | if ( $subloc ) { |
e96daec8 |
742 | my $fh = $self->_fh; |
743 | seek($fh, $tag->{offset} + $offset + $self->_fileobj->{file_offset}, SEEK_SET); |
386bab6c |
744 | print( $fh substr($tag->{content}, $offset + $self->{bucket_size} ) ); |
251dfd0e |
745 | print( $fh chr(0) x $self->{bucket_size} ); |
d0b74c17 |
746 | |
ab0e4957 |
747 | return 1; |
386bab6c |
748 | } |
beac1dff |
749 | return; |
ab0e4957 |
750 | } |
751 | |
912d50b1 |
752 | sub bucket_exists { |
beac1dff |
753 | ## |
754 | # Check existence of single key given tag and MD5 digested key. |
755 | ## |
756 | my $self = shift; |
e96daec8 |
757 | my ($tag, $md5) = @_; |
912d50b1 |
758 | |
21838116 |
759 | #ACID - This is a read. Can find exact or HEAD |
9a187d8c |
760 | my ($subloc, $offset, $size) = $self->_find_in_buckets( $tag, $md5 ); |
d5d7c51d |
761 | return $subloc && 1; |
912d50b1 |
762 | } |
763 | |
6736c116 |
764 | sub find_bucket_list { |
beac1dff |
765 | ## |
766 | # Locate offset for bucket list, given digested key |
767 | ## |
768 | my $self = shift; |
e96daec8 |
769 | my ($offset, $md5, $args) = @_; |
d0b74c17 |
770 | $args = {} unless $args; |
771 | |
21838116 |
772 | local($/,$\); |
773 | |
beac1dff |
774 | ## |
775 | # Locate offset for bucket list using digest index system |
776 | ## |
e96daec8 |
777 | my $tag = $self->load_tag( $offset ) |
778 | or $self->_throw_error( "INTERNAL ERROR - Cannot find tag" ); |
d0b74c17 |
779 | |
e5fc7e69 |
780 | my $ch = 0; |
8db25060 |
781 | while ($tag->{signature} ne SIG_BLIST) { |
d0b74c17 |
782 | my $num = ord substr($md5, $ch, 1); |
783 | |
784 | my $ref_loc = $tag->{offset} + ($num * $self->{long_size}); |
e96daec8 |
785 | $tag = $self->index_lookup( $tag, $num ); |
d0b74c17 |
786 | |
787 | if (!$tag) { |
29b01632 |
788 | return if !$args->{create}; |
d0b74c17 |
789 | |
16d1ad9b |
790 | my $loc = $self->_request_space( |
e96daec8 |
791 | $self->tag_size( $self->{bucket_list_size} ), |
16d1ad9b |
792 | ); |
793 | |
e96daec8 |
794 | my $fh = $self->_fh; |
795 | seek($fh, $ref_loc + $self->_fileobj->{file_offset}, SEEK_SET); |
16d1ad9b |
796 | print( $fh pack($self->{long_pack}, $loc) ); |
d0b74c17 |
797 | |
9e4f83a0 |
798 | $tag = $self->write_tag( |
e96daec8 |
799 | $loc, SIG_BLIST, |
f37c15ab |
800 | chr(0)x$self->{bucket_list_size}, |
d5d7c51d |
801 | ); |
802 | |
803 | $tag->{ref_loc} = $ref_loc; |
804 | $tag->{ch} = $ch; |
805 | |
806 | last; |
d0b74c17 |
807 | } |
808 | |
16d1ad9b |
809 | $tag->{ch} = $ch++; |
d0b74c17 |
810 | $tag->{ref_loc} = $ref_loc; |
beac1dff |
811 | } |
d0b74c17 |
812 | |
beac1dff |
813 | return $tag; |
6736c116 |
814 | } |
815 | |
d0b74c17 |
816 | sub index_lookup { |
817 | ## |
818 | # Given index tag, lookup single entry in index and return . |
819 | ## |
820 | my $self = shift; |
e96daec8 |
821 | my ($tag, $index) = @_; |
d0b74c17 |
822 | |
823 | my $location = unpack( |
824 | $self->{long_pack}, |
825 | substr( |
826 | $tag->{content}, |
827 | $index * $self->{long_size}, |
828 | $self->{long_size}, |
829 | ), |
830 | ); |
831 | |
832 | if (!$location) { return; } |
833 | |
e96daec8 |
834 | return $self->load_tag( $location ); |
d0b74c17 |
835 | } |
836 | |
6736c116 |
837 | sub traverse_index { |
beac1dff |
838 | ## |
839 | # Scan index and recursively step into deeper levels, looking for next key. |
840 | ## |
6736c116 |
841 | my $self = shift; |
842 | my ($obj, $offset, $ch, $force_return_next) = @_; |
d0b74c17 |
843 | |
21838116 |
844 | local($/,$\); |
845 | |
e96daec8 |
846 | my $tag = $self->load_tag( $offset ); |
6736c116 |
847 | |
e96daec8 |
848 | my $fh = $self->_fh; |
d0b74c17 |
849 | |
8db25060 |
850 | if ($tag->{signature} ne SIG_BLIST) { |
beac1dff |
851 | my $content = $tag->{content}; |
e5fc7e69 |
852 | my $start = $obj->{return_next} ? 0 : ord(substr($obj->{prev_md5}, $ch, 1)); |
d0b74c17 |
853 | |
d5d7c51d |
854 | for (my $idx = $start; $idx < (2**8); $idx++) { |
e5fc7e69 |
855 | my $subloc = unpack( |
856 | $self->{long_pack}, |
e06824f8 |
857 | substr( |
858 | $content, |
859 | $idx * $self->{long_size}, |
860 | $self->{long_size}, |
861 | ), |
e5fc7e69 |
862 | ); |
863 | |
beac1dff |
864 | if ($subloc) { |
e5fc7e69 |
865 | my $result = $self->traverse_index( |
866 | $obj, $subloc, $ch + 1, $force_return_next, |
867 | ); |
868 | |
beac1dff |
869 | if (defined($result)) { return $result; } |
870 | } |
871 | } # index loop |
d0b74c17 |
872 | |
beac1dff |
873 | $obj->{return_next} = 1; |
874 | } # tag is an index |
d0b74c17 |
875 | |
e5fc7e69 |
876 | else { |
beac1dff |
877 | my $keys = $tag->{content}; |
878 | if ($force_return_next) { $obj->{return_next} = 1; } |
d0b74c17 |
879 | |
beac1dff |
880 | ## |
881 | # Iterate through buckets, looking for a key match |
882 | ## |
8db25060 |
883 | for (my $i = 0; $i < $self->{max_buckets}; $i++) { |
9cec1360 |
884 | my ($key, $subloc) = $self->_get_key_subloc( $keys, $i ); |
d0b74c17 |
885 | |
8db25060 |
886 | # End of bucket list -- return to outer loop |
beac1dff |
887 | if (!$subloc) { |
beac1dff |
888 | $obj->{return_next} = 1; |
889 | last; |
890 | } |
8db25060 |
891 | # Located previous key -- return next one found |
beac1dff |
892 | elsif ($key eq $obj->{prev_md5}) { |
beac1dff |
893 | $obj->{return_next} = 1; |
894 | next; |
895 | } |
8db25060 |
896 | # Seek to bucket location and skip over signature |
beac1dff |
897 | elsif ($obj->{return_next}) { |
e96daec8 |
898 | seek($fh, $subloc + $self->_fileobj->{file_offset}, SEEK_SET); |
d0b74c17 |
899 | |
beac1dff |
900 | # Skip over value to get to plain key |
8db25060 |
901 | my $sig; |
902 | read( $fh, $sig, SIG_SIZE ); |
903 | |
beac1dff |
904 | my $size; |
e5fc7e69 |
905 | read( $fh, $size, $self->{data_size}); |
906 | $size = unpack($self->{data_pack}, $size); |
beac1dff |
907 | if ($size) { seek($fh, $size, SEEK_CUR); } |
d0b74c17 |
908 | |
beac1dff |
909 | # Read in plain key and return as scalar |
beac1dff |
910 | my $plain_key; |
e5fc7e69 |
911 | read( $fh, $size, $self->{data_size}); |
912 | $size = unpack($self->{data_pack}, $size); |
beac1dff |
913 | if ($size) { read( $fh, $plain_key, $size); } |
d0b74c17 |
914 | |
beac1dff |
915 | return $plain_key; |
916 | } |
8db25060 |
917 | } |
d0b74c17 |
918 | |
beac1dff |
919 | $obj->{return_next} = 1; |
920 | } # tag is a bucket list |
d0b74c17 |
921 | |
beac1dff |
922 | return; |
6736c116 |
923 | } |
924 | |
925 | sub get_next_key { |
beac1dff |
926 | ## |
927 | # Locate next key, given digested previous one |
928 | ## |
6736c116 |
929 | my $self = shift; |
930 | my ($obj) = @_; |
d0b74c17 |
931 | |
beac1dff |
932 | $obj->{prev_md5} = $_[1] ? $_[1] : undef; |
933 | $obj->{return_next} = 0; |
d0b74c17 |
934 | |
beac1dff |
935 | ## |
936 | # If the previous key was not specifed, start at the top and |
937 | # return the first one found. |
938 | ## |
939 | if (!$obj->{prev_md5}) { |
940 | $obj->{prev_md5} = chr(0) x $self->{hash_size}; |
941 | $obj->{return_next} = 1; |
942 | } |
d0b74c17 |
943 | |
beac1dff |
944 | return $self->traverse_index( $obj, $obj->_base_offset, 0 ); |
6736c116 |
945 | } |
946 | |
75be6413 |
947 | # Utilities |
948 | |
9cec1360 |
949 | sub _get_key_subloc { |
75be6413 |
950 | my $self = shift; |
951 | my ($keys, $idx) = @_; |
952 | |
28394a1a |
953 | my ($key, $subloc, $size, $transaction) = unpack( |
954 | # This is 'a', not 'A'. Please read the pack() documentation for the |
955 | # difference between the two and why it's important. |
956 | "a$self->{hash_size} $self->{long_pack} $self->{long_pack} $self->{long_pack}", |
75be6413 |
957 | substr( |
958 | $keys, |
9cec1360 |
959 | ($idx * $self->{bucket_size}), |
960 | $self->{bucket_size}, |
75be6413 |
961 | ), |
962 | ); |
963 | |
28394a1a |
964 | return ($key, $subloc, $size, $transaction); |
75be6413 |
965 | } |
966 | |
d608b06e |
967 | sub _find_in_buckets { |
968 | my $self = shift; |
21838116 |
969 | my ($tag, $md5, $exact) = @_; |
d608b06e |
970 | |
28394a1a |
971 | my $trans_id = $self->_fileobj->transaction_id; |
972 | |
21838116 |
973 | my @zero; |
974 | |
d608b06e |
975 | BUCKET: |
976 | for ( my $i = 0; $i < $self->{max_buckets}; $i++ ) { |
28394a1a |
977 | my ($key, $subloc, $size, $transaction_id) = $self->_get_key_subloc( |
9a187d8c |
978 | $tag->{content}, $i, |
979 | ); |
d608b06e |
980 | |
21838116 |
981 | my @rv = ($subloc, $i * $self->{bucket_size}, $size); |
982 | |
983 | unless ( $subloc ) { |
984 | return @zero if !$exact && @zero and $trans_id; |
985 | return @rv; |
986 | } |
987 | |
988 | next BUCKET if $key ne $md5; |
d608b06e |
989 | |
21838116 |
990 | # Save off the HEAD in case we need it. |
991 | @zero = @rv if $transaction_id == 0; |
d608b06e |
992 | |
21838116 |
993 | next BUCKET if $transaction_id != $trans_id; |
994 | |
995 | return @rv; |
d608b06e |
996 | } |
997 | |
998 | return; |
999 | } |
1000 | |
994ccd8e |
1001 | sub _request_space { |
1002 | my $self = shift; |
e96daec8 |
1003 | my ($size) = @_; |
994ccd8e |
1004 | |
460b1067 |
1005 | my $loc = $self->_fileobj->{end}; |
1006 | $self->_fileobj->{end} += $size; |
994ccd8e |
1007 | |
1008 | return $loc; |
1009 | } |
1010 | |
1011 | sub _release_space { |
1012 | my $self = shift; |
e96daec8 |
1013 | my ($size, $loc) = @_; |
994ccd8e |
1014 | |
21838116 |
1015 | local($/,$\); |
1016 | |
7b1e1aa1 |
1017 | my $next_loc = 0; |
1018 | |
e96daec8 |
1019 | my $fh = $self->_fh; |
1020 | seek( $fh, $loc + $self->_fileobj->{file_offset}, SEEK_SET ); |
7b1e1aa1 |
1021 | print( $fh SIG_FREE |
1022 | . pack($self->{long_pack}, $size ) |
1023 | . pack($self->{long_pack}, $next_loc ) |
1024 | ); |
1025 | |
994ccd8e |
1026 | return; |
1027 | } |
1028 | |
e96daec8 |
1029 | sub _throw_error { |
1030 | die "DBM::Deep: $_[1]\n"; |
1031 | } |
1032 | |
a20d9a3f |
1033 | 1; |
1034 | __END__ |
d5d7c51d |
1035 | |
1036 | # This will be added in later, after more refactoring is done. This is an early |
1037 | # attempt at refactoring on the physical level instead of the virtual level. |
1038 | sub _read_at { |
1039 | my $self = shift; |
e96daec8 |
1040 | my ($spot, $amount, $unpack) = @_; |
d5d7c51d |
1041 | |
21838116 |
1042 | local($/,$\); |
1043 | |
e96daec8 |
1044 | my $fh = $self->_fh; |
1045 | seek( $fh, $spot + $self->_fileobj->{file_offset}, SEEK_SET ); |
d5d7c51d |
1046 | |
1047 | my $buffer; |
1048 | my $bytes_read = read( $fh, $buffer, $amount ); |
1049 | |
1050 | if ( $unpack ) { |
1051 | $buffer = unpack( $unpack, $buffer ); |
1052 | } |
1053 | |
1054 | if ( wantarray ) { |
1055 | return ($buffer, $bytes_read); |
1056 | } |
1057 | else { |
1058 | return $buffer; |
1059 | } |
1060 | } |
e96daec8 |
1061 | |
1062 | sub _print_at { |
1063 | my $self = shift; |
1064 | my ($spot, $data) = @_; |
1065 | |
21838116 |
1066 | local($/,$\); |
1067 | |
e96daec8 |
1068 | my $fh = $self->_fh; |
1069 | seek( $fh, $spot, SEEK_SET ); |
1070 | print( $fh $data ); |
1071 | |
1072 | return; |
1073 | } |
1074 | |
1075 | sub get_file_version { |
1076 | my $self = shift; |
1077 | |
21838116 |
1078 | local($/,$\); |
1079 | |
e96daec8 |
1080 | my $fh = $self->_fh; |
1081 | |
1082 | seek( $fh, 13 + $self->_fileobj->{file_offset}, SEEK_SET ); |
1083 | my $buffer; |
1084 | my $bytes_read = read( $fh, $buffer, 4 ); |
1085 | unless ( $bytes_read == 4 ) { |
1086 | $self->_throw_error( "Cannot read file version" ); |
1087 | } |
1088 | |
1089 | return unpack( 'N', $buffer ); |
1090 | } |
1091 | |
1092 | sub write_file_version { |
1093 | my $self = shift; |
1094 | my ($new_version) = @_; |
1095 | |
21838116 |
1096 | local($/,$\); |
1097 | |
e96daec8 |
1098 | my $fh = $self->_fh; |
1099 | |
1100 | seek( $fh, 13 + $self->_fileobj->{file_offset}, SEEK_SET ); |
1101 | print( $fh pack( 'N', $new_version ) ); |
1102 | |
1103 | return; |
1104 | } |
1105 | |