1 |
package MARC::Fast; |
2 |
|
3 |
use strict; |
4 |
use Carp; |
5 |
use Data::Dumper; |
6 |
|
7 |
BEGIN { |
8 |
use Exporter (); |
9 |
use vars qw ($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS); |
10 |
$VERSION = 0.09; |
11 |
@ISA = qw (Exporter); |
12 |
#Give a hoot don't pollute, do not export more than needed by default |
13 |
@EXPORT = qw (); |
14 |
@EXPORT_OK = qw (); |
15 |
%EXPORT_TAGS = (); |
16 |
} |
17 |
|
18 |
=head1 NAME |
19 |
|
20 |
MARC::Fast - Very fast implementation of MARC database reader |
21 |
|
22 |
=head1 SYNOPSIS |
23 |
|
24 |
use MARC::Fast; |
25 |
|
26 |
my $marc = new MARC::Fast( |
27 |
marcdb => 'unimarc.iso', |
28 |
); |
29 |
|
30 |
foreach my $mfn ( 1 .. $marc->count ) { |
31 |
print $marc->to_ascii( $mfn ); |
32 |
} |
33 |
|
34 |
For longer example with command line options look at L<scripts/dump_fastmarc.pl> |
35 |
|
36 |
=head1 DESCRIPTION |
37 |
|
38 |
This is very fast alternative to C<MARC> and C<MARC::Record> modules. |
39 |
|
40 |
It's is also very subtable for random access to MARC records (as opposed to |
41 |
sequential one). |
42 |
|
43 |
=head1 METHODS |
44 |
|
45 |
=head2 new |
46 |
|
47 |
Read MARC database |
48 |
|
49 |
my $marc = new MARC::Fast( |
50 |
marcdb => 'unimarc.iso', |
51 |
quiet => 0, |
52 |
debug => 0, |
53 |
assert => 0, |
54 |
hash_filter => sub { |
55 |
my ($t, $record_number) = @_; |
56 |
$t =~ s/foo/bar/; |
57 |
return $t; |
58 |
}, |
59 |
); |
60 |
|
61 |
=cut |
62 |
|
63 |
################################################## subroutine header end ## |
64 |
|
65 |
|
66 |
sub new { |
67 |
my $class = shift; |
68 |
my $self = {@_}; |
69 |
bless ($self, $class); |
70 |
|
71 |
croak "need marcdb parametar" unless ($self->{marcdb}); |
72 |
|
73 |
print STDERR "# opening ",$self->{marcdb},"\n" if ($self->{debug}); |
74 |
|
75 |
open($self->{fh}, $self->{marcdb}) || croak "can't open ",$self->{marcdb},": $!"; |
76 |
binmode($self->{fh}); |
77 |
|
78 |
$self->{count} = 0; |
79 |
|
80 |
while (! eof($self->{fh})) { |
81 |
$self->{count}++; |
82 |
|
83 |
# save record position |
84 |
push @{$self->{fh_offset}}, tell($self->{fh}); |
85 |
|
86 |
my $leader; |
87 |
my $len = read($self->{fh}, $leader, 24); |
88 |
|
89 |
if ($len < 24) { |
90 |
carp "short read of leader, aborting\n"; |
91 |
last; |
92 |
} |
93 |
|
94 |
# Byte Name |
95 |
# ---- ---- |
96 |
# 0-4 Record Length |
97 |
# 5 Status (n=new, c=corrected and d=deleted) |
98 |
# 6 Type of Record (a=printed material) |
99 |
# 7 Bibliographic Level (m=monograph) |
100 |
# 8-9 Blanks |
101 |
# 10 Indictator count (2 for monographs) |
102 |
# 11 Subfield code count (2 - 0x1F+subfield code itself) |
103 |
# 12-16 Base address of data |
104 |
# 17 Encoding level (blank=full level, 1=sublevel 1, 2=sublevel 2, |
105 |
# 3=sublevel 3) |
106 |
# 18 Descriptive Cataloguing Form (blank=record is full ISBD, |
107 |
# n=record is in non-ISBD format, i=record is in |
108 |
# an incomplete ISBD format) |
109 |
# 19 Blank |
110 |
# 20 Length of length field in directory (always 4 in UNIMARC) |
111 |
# 21 Length of Starting Character Position in directory (always |
112 |
# 5 in UNIMARC) |
113 |
# 22 Length of implementation defined portion in directory (always |
114 |
# 0 in UNIMARC) |
115 |
# 23 Blank |
116 |
# |
117 |
# |0 45 89 |12 16|1n 450 | |
118 |
# |xxxxxnam 22(.....) 45 <--- |
119 |
|
120 |
print STDERR "REC ",$self->{count},": $leader\n" if ($self->{debug}); |
121 |
|
122 |
# store leader for later |
123 |
push @{$self->{leader}}, $leader; |
124 |
|
125 |
# skip to next record |
126 |
my $o = substr($leader,0,5); |
127 |
if ($o > 24) { |
128 |
seek($self->{fh},$o-24,1) if ($o); |
129 |
} else { |
130 |
last; |
131 |
} |
132 |
|
133 |
} |
134 |
|
135 |
return $self; |
136 |
} |
137 |
|
138 |
=head2 count |
139 |
|
140 |
Return number of records in database |
141 |
|
142 |
print $marc->count; |
143 |
|
144 |
=cut |
145 |
|
146 |
sub count { |
147 |
my $self = shift; |
148 |
return $self->{count}; |
149 |
} |
150 |
|
151 |
=head2 fetch |
152 |
|
153 |
Fetch record from database |
154 |
|
155 |
my $hash = $marc->fetch(42); |
156 |
|
157 |
First record number is C<1> |
158 |
|
159 |
=cut |
160 |
|
161 |
sub fetch { |
162 |
my $self = shift; |
163 |
|
164 |
my $rec_nr = shift; |
165 |
|
166 |
if ( ! $rec_nr ) { |
167 |
$self->{last_leader} = undef; |
168 |
return; |
169 |
} |
170 |
|
171 |
my $leader = $self->{leader}->[$rec_nr - 1]; |
172 |
$self->{last_leader} = $leader; |
173 |
unless ($leader) { |
174 |
carp "can't find record $rec_nr"; |
175 |
return; |
176 |
}; |
177 |
my $offset = $self->{fh_offset}->[$rec_nr - 1]; |
178 |
unless (defined($offset)) { |
179 |
carp "can't find offset for record $rec_nr"; |
180 |
return; |
181 |
}; |
182 |
|
183 |
my $reclen = substr($leader,0,5); |
184 |
my $base_addr = substr($leader,12,5); |
185 |
|
186 |
print STDERR "# $rec_nr leader: '$leader' reclen: $reclen base addr: $base_addr [dir: ",$base_addr - 24,"]\n" if ($self->{debug}); |
187 |
|
188 |
my $skip = 0; |
189 |
|
190 |
print STDERR "# seeking to $offset + 24\n" if ($self->{debug}); |
191 |
|
192 |
if ( ! seek($self->{fh}, $offset+24, 0) ) { |
193 |
carp "can't seek to $offset: $!"; |
194 |
return; |
195 |
} |
196 |
|
197 |
print STDERR "# reading ",$base_addr-24," bytes of dictionary\n" if ($self->{debug}); |
198 |
|
199 |
my $directory; |
200 |
if( ! read($self->{fh},$directory,$base_addr-24) ) { |
201 |
carp "can't read directory: $!"; |
202 |
$skip = 1; |
203 |
} else { |
204 |
print STDERR "# $rec_nr directory: [",length($directory),"] '$directory'\n" if ($self->{debug}); |
205 |
} |
206 |
|
207 |
print STDERR "# reading ",$reclen-$base_addr," bytes of fields\n" if ($self->{debug}); |
208 |
|
209 |
my $fields; |
210 |
if( ! read($self->{fh},$fields,$reclen-$base_addr) ) { |
211 |
carp "can't read fields: $!"; |
212 |
$skip = 1; |
213 |
} else { |
214 |
print STDERR "# $rec_nr fields: '$fields'\n" if ($self->{debug}); |
215 |
} |
216 |
|
217 |
my $row; |
218 |
|
219 |
while (!$skip && $directory =~ s/(\d{3})(\d{4})(\d{5})//) { |
220 |
my ($tag,$len,$addr) = ($1,$2,$3); |
221 |
|
222 |
if (($addr+$len) > length($fields)) { |
223 |
print STDERR "WARNING: error in dictionary on record $rec_nr skipping...\n" if (! $self->{quiet}); |
224 |
$skip = 1; |
225 |
next; |
226 |
} |
227 |
|
228 |
# take field |
229 |
my $f = substr($fields,$addr,$len); |
230 |
print STDERR "tag/len/addr $tag [$len] $addr: '$f'\n" if ($self->{debug}); |
231 |
|
232 |
push @{ $row->{$tag} }, $f; |
233 |
|
234 |
my $del = substr($fields,$addr+$len-1,1); |
235 |
|
236 |
# check field delimiters... |
237 |
if ($self->{assert} && $del ne chr(30)) { |
238 |
print STDERR "WARNING: skipping record $rec_nr, can't find delimiter 30 got: '$del'\n" if (! $self->{quiet}); |
239 |
$skip = 1; |
240 |
next; |
241 |
} |
242 |
|
243 |
if ($self->{assert} && length($f) < 2) { |
244 |
print STDERR "WARNING: skipping field $tag from record $rec_nr because it's too short!\n" if (! $self->{quiet}); |
245 |
next; |
246 |
} |
247 |
|
248 |
} |
249 |
|
250 |
return $row; |
251 |
} |
252 |
|
253 |
|
254 |
=head2 last_leader |
255 |
|
256 |
Returns leader of last record L<fetch>ed |
257 |
|
258 |
print $marc->last_leader; |
259 |
|
260 |
Added in version 0.08 of this module, so if you need it use: |
261 |
|
262 |
use MARC::Fast 0.08; |
263 |
|
264 |
to be sure that it's supported. |
265 |
|
266 |
=cut |
267 |
|
268 |
sub last_leader { |
269 |
my $self = shift; |
270 |
return $self->{last_leader}; |
271 |
} |
272 |
|
273 |
|
274 |
=head2 to_hash |
275 |
|
276 |
Read record with specified MFN and convert it to hash |
277 |
|
278 |
my $hash = $marc->to_hash( $mfn, include_subfields => 1, ); |
279 |
|
280 |
It has ability to convert characters (using C<hash_filter>) from MARC |
281 |
database before creating structures enabling character re-mapping or quick |
282 |
fix-up of data. |
283 |
|
284 |
This function returns hash which is like this: |
285 |
|
286 |
'200' => [ |
287 |
{ |
288 |
'i1' => '1', |
289 |
'i2' => ' ' |
290 |
'a' => 'Goa', |
291 |
'f' => 'Valdo D\'Arienzo', |
292 |
'e' => 'tipografie e tipografi nel XVI secolo', |
293 |
} |
294 |
], |
295 |
|
296 |
This method will also create additional field C<000> with MFN. |
297 |
|
298 |
=cut |
299 |
|
300 |
sub to_hash { |
301 |
my $self = shift; |
302 |
|
303 |
my $mfn = shift || confess "need mfn!"; |
304 |
|
305 |
my $args = {@_}; |
306 |
|
307 |
# init record to include MFN as field 000 |
308 |
my $rec = { '000' => [ $mfn ] }; |
309 |
|
310 |
my $row = $self->fetch($mfn) || return; |
311 |
|
312 |
foreach my $rec_nr (keys %{$row}) { |
313 |
foreach my $l (@{$row->{$rec_nr}}) { |
314 |
|
315 |
# remove end marker |
316 |
$l =~ s/\x1E$//; |
317 |
|
318 |
# filter output |
319 |
$l = $self->{'hash_filter'}->($l, $rec_nr) if ($self->{'hash_filter'}); |
320 |
|
321 |
my $val; |
322 |
|
323 |
# has identifiers? |
324 |
($val->{'i1'},$val->{'i2'}) = ($1,$2) if ($l =~ s/^([01 #])([01 #])\x1F/\x1F/); |
325 |
|
326 |
my $sf_usage; |
327 |
my @subfields; |
328 |
|
329 |
# has subfields? |
330 |
if ($l =~ m/\x1F/) { |
331 |
foreach my $t (split(/\x1F/,$l)) { |
332 |
next if (! $t); |
333 |
my $f = substr($t,0,1); |
334 |
|
335 |
push @subfields, ( $f, $sf_usage->{$f}++ || 0 ); |
336 |
|
337 |
# repeatable subfiled -- convert it to array |
338 |
if ($val->{$f}) { |
339 |
if ( ref($val->{$f}) ne 'ARRAY' ) { |
340 |
$val->{$f} = [ $val->{$f}, $val ]; |
341 |
} else { |
342 |
push @{$val->{$f}}, $val; |
343 |
} |
344 |
} |
345 |
$val->{substr($t,0,1)} = substr($t,1); |
346 |
} |
347 |
$val->{subfields} = [ @subfields ] if $args->{include_subfields}; |
348 |
} else { |
349 |
$val = $l; |
350 |
} |
351 |
|
352 |
push @{$rec->{$rec_nr}}, $val; |
353 |
} |
354 |
} |
355 |
|
356 |
return $rec; |
357 |
} |
358 |
|
359 |
=head2 to_ascii |
360 |
|
361 |
print $marc->to_ascii( 42 ); |
362 |
|
363 |
=cut |
364 |
|
365 |
sub to_ascii { |
366 |
my $self = shift; |
367 |
|
368 |
my $mfn = shift || confess "need mfn"; |
369 |
my $row = $self->fetch($mfn) || return; |
370 |
|
371 |
my $out; |
372 |
|
373 |
foreach my $f (sort keys %{$row}) { |
374 |
my $dump = join('', @{ $row->{$f} }); |
375 |
$dump =~ s/\x1e$//; |
376 |
$dump =~ s/\x1f/\$/g; |
377 |
$out .= "$f\t$dump\n"; |
378 |
} |
379 |
|
380 |
return $out; |
381 |
} |
382 |
|
383 |
1; |
384 |
__END__ |
385 |
|
386 |
=head1 AUTHOR |
387 |
|
388 |
Dobrica Pavlinusic |
389 |
CPAN ID: DPAVLIN |
390 |
dpavlin@rot13.org |
391 |
https://www.rot13.org/~dpavlin/ |
392 |
|
393 |
=head1 COPYRIGHT |
394 |
|
395 |
This program is free software; you can redistribute |
396 |
it and/or modify it under the same terms as Perl itself. |
397 |
|
398 |
The full text of the license can be found in the |
399 |
LICENSE file included with this module. |
400 |
|
401 |
|
402 |
=head1 SEE ALSO |
403 |
|
404 |
L<Biblio::Isis>, perl(1). |
405 |
|
406 |
=cut |