5 use File::Glob qw(:globally :nocase);
11 use vars qw ($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);
14 #Give a hoot don't pollute, do not export more than needed by default
23 Biblio::Isis - Read CDS/ISIS, WinISIS and IsisMarc database
29 my $isis = new Biblio::Isis(
30 isisdb => './cds/cds',
33 for(my $mfn = 1; $mfn <= $isis->count; $mfn++) {
34 print $isis->to_ascii($mfn),"\n";
39 This module will read ISIS databases created by DOS CDS/ISIS, WinIsis or
40 IsisMarc. It can be used as perl-only alternative to OpenIsis module which
41 seems to depriciate it's old C<XS> bindings for perl.
43 It can create hash values from data in ISIS database (using C<to_hash>),
44 ASCII dump (using C<to_ascii>) or just hash with field names and packed
45 values (like C<^asomething^belse>).
47 Unique feature of this module is ability to C<include_deleted> records.
48 It will also skip zero sized fields (OpenIsis has a bug in XS bindings, so
49 fields which are zero sized will be filled with random junk from memory).
51 It also has support for identifiers (only if ISIS database is created by
52 IsisMarc), see C<to_hash>.
54 This module will always be slower than OpenIsis module which use C
55 library. However, since it's written in perl, it's platform independent (so
56 you don't need C compiler), and can be easily modified. I hope that it
57 creates data structures which are easier to use than ones created by
58 OpenIsis, so reduced time in other parts of the code should compensate for
59 slower performance of this module (speed of reading ISIS database is
66 # my $ORDN; # Nodes Order
67 # my $ORDF; # Leafs Order
68 # my $N; # Number of Memory buffers for nodes
69 # my $K; # Number of buffers for first level index
70 # my $LIV; # Current number of Index Levels
71 # my $POSRX; # Pointer to Root Record in N0x
72 # my $NMAXPOS; # Next Available position in N0x
73 # my $FMAXPOS; # Next available position in L0x
74 # my $ABNORMAL; # Formal BTree normality indicator
84 my $isis = new Biblio::Isis(
85 isisdb => './cds/cds',
95 Options are described below:
101 This is full or relative path to ISIS database files which include
102 common prefix of C<.MST>, and C<.XRF> and optionally C<.FDT> (if using
103 C<read_fdt> option) files.
105 In this example it uses C<./cds/cds.MST> and related files.
109 Boolean flag to specify if field definition table should be read. It's off
112 =item include_deleted
114 Don't skip logically deleted records in ISIS.
118 Filter code ref which will be used before data is converted to hash.
122 Dump a B<lot> of debugging output.
131 bless($self, $class);
133 croak "new needs database name (isisdb) as argument!" unless ({@_}->{isisdb});
135 foreach my $v (qw{isisdb debug include_deleted hash_filter}) {
136 $self->{$v} = {@_}->{$v};
139 my @isis_files = grep(/\.(FDT|MST|XRF|CNT)$/i,glob($self->{isisdb}."*"));
141 foreach my $f (@isis_files) {
142 my $ext = $1 if ($f =~ m/\.(\w\w\w)$/);
143 $self->{lc($ext)."_file"} = $f;
146 my @must_exist = qw(mst xrf);
147 push @must_exist, "fdt" if ($self->{read_fdt});
149 foreach my $ext (@must_exist) {
150 unless ($self->{$ext."_file"}) {
151 carp "missing ",uc($ext)," file in ",$self->{isisdb};
156 print STDERR "## using files: ",join(" ",@isis_files),"\n" if ($self->{debug});
158 # if you want to read .FDT file use read_fdt argument when creating class!
159 if ($self->{read_fdt} && -e $self->{fdt_file}) {
161 # read the $db.FDT file for tags
164 open(my $fileFDT, $self->{fdt_file}) || croak "can't read '$self->{fdt_file}': $!";
170 my $name=substr($_,0,30);
171 my $tag=substr($_,50,3);
176 $self->{'TagName'}->{$tag}=$name;
187 # Get the Maximum MFN from $db.MST
189 open($self->{'fileMST'}, $self->{mst_file}) || croak "can't open '$self->{mst_file}': $!";
190 binmode($self->{'fileMST'});
192 # MST format: (* = 32 bit signed)
194 # NXTMFN* MFN to be assigned to the next record created
195 # NXTMFB* last block allocated to master file
196 # NXTMFP offset to next available position in last block
197 # MFTYPE always 0 for user db file (1 for system)
198 seek($self->{'fileMST'},4,0) || croak "can't seek to offset 0 in MST: $!";
202 read($self->{'fileMST'}, $buff, 4) || croak "can't read NXTMFN from MST: $!";
203 $self->{'NXTMFN'}=unpack("V",$buff) || croak "NXTNFN is zero";
205 print STDERR Dumper($self),"\n" if ($self->{debug});
207 # open files for later
208 open($self->{'fileXRF'}, $self->{xrf_file}) || croak "can't open '$self->{xrf_file}': $!";
209 binmode($self->{'fileXRF'});
211 $self ? return $self : return undef;
216 Return number of records in database
224 return $self->{'NXTMFN'} - 1;
229 Read record with selected MFN
231 my $rec = $isis->fetch(55);
233 Returns hash with keys which are field names and values are unpacked values
234 for that field like this:
237 '210' => [ '^aNew York^cNew York University press^dcop. 1988' ],
238 '990' => [ '2140', '88', 'HAY' ],
246 my $mfn = shift || croak "fetch needs MFN as argument!";
248 # is mfn allready in memory?
249 my $old_mfn = $self->{'current_mfn'} || -1;
250 return $self->{record} if ($mfn == $old_mfn);
252 print STDERR "## fetch: $mfn\n" if ($self->{debug});
255 my $mfnpos=($mfn+int(($mfn-1)/127))*4;
257 print STDERR "## seeking to $mfnpos in file '$self->{xrf_file}'\n" if ($self->{debug});
258 seek($self->{'fileXRF'},$mfnpos,0);
263 delete $self->{record};
265 # read XRFMFB abd XRFMFP
266 read($self->{'fileXRF'}, $buff, 4);
267 my $pointer=unpack("V",$buff) || croak "pointer is null";
269 # check for logically deleted record
270 if ($pointer & 0x80000000) {
271 print STDERR "## record $mfn is logically deleted\n" if ($self->{debug});
272 $self->{deleted} = $mfn;
274 return unless $self->{include_deleted};
277 $pointer = ($pointer ^ 0xffffffff) + 1;
280 my $XRFMFB = int($pointer/2048);
281 my $XRFMFP = $pointer - ($XRFMFB*2048);
283 # (XRFMFB - 1) * 512 + XRFMFP
284 # why do i have to do XRFMFP % 1024 ?
286 my $blk_off = (($XRFMFB - 1) * 512) + ($XRFMFP % 512);
288 print STDERR "## pointer: $pointer XRFMFB: $XRFMFB XRFMFP: $XRFMFP offset: $blk_off\n" if ($self->{'debug'});
290 # Get Record Information
292 seek($self->{'fileMST'},$blk_off,0) || croak "can't seek to $blk_off: $!";
294 read($self->{'fileMST'}, $buff, 4) || croak "can't read 4 bytes at offset $blk_off from MST file: $!";
295 my $value=unpack("V",$buff);
297 print STDERR "## offset for rowid $value is $blk_off (blk $XRFMFB off $XRFMFP)\n" if ($self->{debug});
301 print STDERR "## record $mfn is physically deleted\n" if ($self->{debug});
302 $self->{deleted} = $mfn;
306 carp "Error: MFN ".$mfn." not found in MST file, found $value";
310 read($self->{'fileMST'}, $buff, 14);
312 my ($MFRL,$MFBWB,$MFBWP,$BASE,$NVF,$STATUS) = unpack("vVvvvv", $buff);
314 print STDERR "## MFRL: $MFRL MFBWB: $MFBWB MFBWP: $MFBWP BASE: $BASE NVF: $NVF STATUS: $STATUS\n" if ($self->{debug});
316 warn "MFRL $MFRL is not even number" unless ($MFRL % 2 == 0);
318 warn "BASE is not 18+6*NVF" unless ($BASE == 18 + 6 * $NVF);
320 # Get Directory Format
326 read($self->{'fileMST'}, $buff, 6 * $NVF);
330 for (my $i = 0 ; $i < $NVF ; $i++) {
332 my ($TAG,$POS,$LEN) = unpack("vvv", substr($buff,$i * 6, 6));
334 print STDERR "## TAG: $TAG POS: $POS LEN: $LEN\n" if ($self->{debug});
336 # The TAG does not exists in .FDT so we set it to 0.
338 # XXX This is removed from perl version; .FDT file is updated manually, so
339 # you will often have fields in .MST file which aren't in .FDT. On the other
340 # hand, IsisMarc doesn't use .FDT files at all!
342 #if (! $self->{TagName}->{$TAG}) {
353 # Get Variable Fields
355 read($self->{'fileMST'},$buff,$rec_len);
357 print STDERR "## rec_len: $rec_len poc: ",tell($self->{'fileMST'})."\n" if ($self->{debug});
359 for (my $i = 0 ; $i < $NVF ; $i++) {
360 # skip zero-sized fields
361 next if ($FieldLEN[$i] == 0);
363 push @{$self->{record}->{$FieldTAG[$i]}}, substr($buff,$FieldPOS[$i],$FieldLEN[$i]);
366 $self->{'current_mfn'} = $mfn;
368 print STDERR Dumper($self),"\n" if ($self->{debug});
370 return $self->{'record'};
375 Returns ASCII output of record with specified MFN
377 print $isis->to_ascii(42);
379 This outputs something like this:
381 210 ^aNew York^cNew York University press^dcop. 1988
386 If C<read_fdt> is specified when calling C<new> it will display field names
387 from C<.FDT> file instead of numeric tags.
394 my $mfn = shift || croak "need MFN";
396 my $rec = $self->fetch($mfn);
400 foreach my $f (sort keys %{$rec}) {
401 my $fn = $self->tag_name($f);
402 $out .= "\n$fn\t".join("\n$fn\t",@{$self->{record}->{$f}});
412 Read record with specified MFN and convert it to hash
414 my $hash = $isis->to_hash($mfn);
416 It has ability to convert characters (using C<hash_filter>) from ISIS
417 database before creating structures enabling character re-mapping or quick
420 This function returns hash which is like this:
425 'c' => 'New York University press',
437 You can later use that hash to produce any output from ISIS data.
439 If database is created using IsisMarc, it will also have to special fields
440 which will be used for identifiers, C<i1> and C<i2> like this:
447 'f' => 'Valdo D\'Arienzo',
448 'e' => 'tipografie e tipografi nel XVI secolo',
452 This method will also create additional field C<000> with MFN.
459 my $mfn = shift || confess "need mfn!";
461 # init record to include MFN as field 000
462 my $rec = { '000' => [ $mfn ] };
464 my $row = $self->fetch($mfn);
466 foreach my $k (keys %{$row}) {
467 foreach my $l (@{$row->{$k}}) {
470 $l = $self->{'hash_filter'}->($l) if ($self->{'hash_filter'});
475 ($val->{'i1'},$val->{'i2'}) = ($1,$2) if ($l =~ s/^([01 #])([01 #])\^/\^/);
479 foreach my $t (split(/\^/,$l)) {
481 $val->{substr($t,0,1)} = substr($t,1);
487 push @{$rec->{$k}}, $val;
496 Return name of selected tag
498 print $isis->tag_name('200');
504 my $tag = shift || return;
505 return $self->{'TagName'}->{$tag} || $tag;
511 Read content of C<.CNT> file and return hash containing it.
513 print Dumper($isis->read_cnt);
515 This function is not used by module (C<.CNT> files are not required for this
516 module to work), but it can be useful to examine your index (while debugging
524 croak "missing CNT file in ",$self->{isisdb} unless ($self->{cnt_file});
526 # Get the index information from $db.CNT
528 open(my $fileCNT, $self->{cnt_file}) || croak "can't read '$self->{cnt_file}': $!";
533 read($fileCNT, $buff, 26) || croak "can't read first table from CNT: $!";
534 $self->unpack_cnt($buff);
536 read($fileCNT, $buff, 26) || croak "can't read second table from CNT: $!";
537 $self->unpack_cnt($buff);
546 Unpack one of two 26 bytes fixed length record in C<.CNT> file.
548 Here is definition of record:
550 off key description size
551 0: IDTYPE BTree type s
552 2: ORDN Nodes Order s
553 4: ORDF Leafs Order s
554 6: N Number of Memory buffers for nodes s
555 8: K Number of buffers for first level index s
556 10: LIV Current number of Index Levels s
557 12: POSRX Pointer to Root Record in N0x l
558 16: NMAXPOS Next Available position in N0x l
559 20: FMAXPOS Next available position in L0x l
560 24: ABNORMAL Formal BTree normality indicator s
563 This will fill C<$self> object under C<cnt> with hash. It's used by C<read_cnt>.
570 my @flds = qw(ORDN ORDF N K LIV POSRX NMAXPOS FMAXPOS ABNORMAL);
572 my $buff = shift || return;
573 my @arr = unpack("vvvvvvVVVv", $buff);
575 print STDERR "unpack_cnt: ",join(" ",@arr),"\n" if ($self->{'debug'});
577 my $IDTYPE = shift @arr;
579 $self->{cnt}->{$IDTYPE}->{$_} = abs(shift @arr);
587 Some parts of CDS/ISIS documentation are not detailed enough to exmplain
588 some variations in input databases which has been tested with this module.
589 When I was in doubt, I assumed that OpenIsis's implementation was right
590 (except for obvious bugs).
592 However, every effort has been made to test this module with as much
593 databases (and programs that create them) as possible.
595 I would be very greatful for success or failure reports about usage of this
596 module with databases from programs other than WinIsis and IsisMarc. I had
597 tested this against ouput of one C<isis.dll>-based application, but I don't
598 know any details about it's version.
605 http://www.rot13.org/~dpavlin/
607 This module is based heavily on code from C<LIBISIS.PHP> library to read ISIS files V0.1.1
608 written in php and (c) 2000 Franck Martin <franck@sopac.org> and released under LGPL.
612 This program is free software; you can redistribute
613 it and/or modify it under the same terms as Perl itself.
615 The full text of the license can be found in the
616 LICENSE file included with this module.
621 OpenIsis web site L<http://www.openisis.org>
623 perl4lib site L<http://perl4lib.perl.org>