/[Biblio-Isis]/trunk/lib/Biblio/Isis.pm
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trunk/IsisDB.pm revision 32 by dpavlin, Wed Jan 5 15:46:26 2005 UTC trunk/lib/Biblio/Isis.pm revision 65 by dpavlin, Thu Jul 13 13:34:30 2006 UTC
# Line 1  Line 1 
1  package IsisDB;  package Biblio::Isis;
2  use strict;  use strict;
3    
4  use Carp;  use Carp;
5  use File::Glob qw(:globally :nocase);  use File::Glob qw(:globally :nocase);
6    
 use Data::Dumper;  
   
7  BEGIN {  BEGIN {
8          use Exporter ();          use Exporter ();
9          use vars qw ($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);          use vars qw ($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);
10          $VERSION     = 0.09;          $VERSION     = 0.22;
11          @ISA         = qw (Exporter);          @ISA         = qw (Exporter);
12          #Give a hoot don't pollute, do not export more than needed by default          #Give a hoot don't pollute, do not export more than needed by default
13          @EXPORT      = qw ();          @EXPORT      = qw ();
# Line 20  BEGIN { Line 18  BEGIN {
18    
19  =head1 NAME  =head1 NAME
20    
21  IsisDB - Read CDS/ISIS, WinISIS and IsisMarc database  Biblio::Isis - Read CDS/ISIS, WinISIS and IsisMarc database
22    
23  =head1 SYNOPSIS  =head1 SYNOPSIS
24    
25    use IsisDB;    use Biblio::Isis;
26    
27    my $isis = new IsisDB(    my $isis = new Biblio::Isis(
28          isisdb => './cds/cds',          isisdb => './cds/cds',
29    );    );
30    
# Line 81  rarely an issue). Line 79  rarely an issue).
79    
80  Open ISIS database  Open ISIS database
81    
82   my $isis = new IsisDB(   my $isis = new Biblio::Isis(
83          isisdb => './cds/cds',          isisdb => './cds/cds',
84          read_fdt => 1,          read_fdt => 1,
85          include_deleted => 1,          include_deleted => 1,
86          hash_filter => sub {          hash_filter => sub {
87                  my $v = shift;                  my ($v,$field_number) = @_;
88                  $v =~ s#foo#bar#g;                  $v =~ s#foo#bar#g;
89          },          },
90          debug => 1,          debug => 1,
91            join_subfields_with => ' ; ',
92   );   );
93    
94  Options are described below:  Options are described below:
# Line 115  Don't skip logically deleted records in Line 114  Don't skip logically deleted records in
114    
115  =item hash_filter  =item hash_filter
116    
117  Filter code ref which will be used before data is converted to hash.  Filter code ref which will be used before data is converted to hash. It will
118    receive two arguments, whole line from current field (in C<< $_[0] >>) and
119    field number (in C<< $_[1] >>).
120    
121  =item debug  =item debug
122    
123  Dump a B<lot> of debugging output.  Dump a B<lot> of debugging output even at level 1. For even more increase level.
124    
125    =item join_subfields_with
126    
127    Define delimiter which will be used to join repeatable subfields. This
128    option is included to support lagacy application written against version
129    older than 0.21 of this module. By default, it disabled. See L</to_hash>.
130    
131  =back  =back
132    
# Line 147  sub new { Line 154  sub new {
154          push @must_exist, "fdt" if ($self->{read_fdt});          push @must_exist, "fdt" if ($self->{read_fdt});
155    
156          foreach my $ext (@must_exist) {          foreach my $ext (@must_exist) {
157                  croak "missing ",uc($ext)," file in ",$self->{isisdb} unless ($self->{$ext."_file"});                  unless ($self->{$ext."_file"}) {
158                            carp "missing ",uc($ext)," file in ",$self->{isisdb};
159                            return;
160                    }
161          }          }
162    
163          print STDERR "## using files: ",join(" ",@isis_files),"\n" if ($self->{debug});          if ($self->{debug}) {
164                    print STDERR "## using files: ",join(" ",@isis_files),"\n";
165                    eval "use Data::Dump";
166    
167                    if (! $@) {
168                            *Dumper = *Data::Dump::dump;
169                    } else {
170                            use Data::Dumper;
171                    }
172            }
173    
174          # if you want to read .FDT file use read_fdt argument when creating class!          # if you want to read .FDT file use read_fdt argument when creating class!
175          if ($self->{read_fdt} && -e $self->{fdt_file}) {          if ($self->{read_fdt} && -e $self->{fdt_file}) {
# Line 158  sub new { Line 177  sub new {
177                  # read the $db.FDT file for tags                  # read the $db.FDT file for tags
178                  my $fieldzone=0;                  my $fieldzone=0;
179    
180                  open(fileFDT, $self->{fdt_file}) || croak "can't read '$self->{fdt_file}': $!";                  open(my $fileFDT, $self->{fdt_file}) || croak "can't read '$self->{fdt_file}': $!";
181                    binmode($fileFDT);
182    
183                  while (<fileFDT>) {                  while (<$fileFDT>) {
184                          chomp;                          chomp;
185                          if ($fieldzone) {                          if ($fieldzone) {
186                                  my $name=substr($_,0,30);                                  my $name=substr($_,0,30);
# Line 177  sub new { Line 197  sub new {
197                          }                          }
198                  }                  }
199                                    
200                  close(fileFDT);                  close($fileFDT);
201          }          }
202    
203          # Get the Maximum MFN from $db.MST          # Get the Maximum MFN from $db.MST
204    
205          open($self->{'fileMST'}, $self->{mst_file}) || croak "can't open '$self->{mst_file}': $!";          open($self->{'fileMST'}, $self->{mst_file}) || croak "can't open '$self->{mst_file}': $!";
206            binmode($self->{'fileMST'});
207    
208          # MST format:   (* = 32 bit signed)          # MST format:   (* = 32 bit signed)
209          # CTLMFN*       always 0          # CTLMFN*       always 0
# Line 190  sub new { Line 211  sub new {
211          # NXTMFB*       last block allocated to master file          # NXTMFB*       last block allocated to master file
212          # NXTMFP        offset to next available position in last block          # NXTMFP        offset to next available position in last block
213          # MFTYPE        always 0 for user db file (1 for system)          # MFTYPE        always 0 for user db file (1 for system)
214          seek($self->{'fileMST'},4,0);          seek($self->{'fileMST'},4,0) || croak "can't seek to offset 0 in MST: $!";
215    
216          my $buff;          my $buff;
217    
218          read($self->{'fileMST'}, $buff, 4);          read($self->{'fileMST'}, $buff, 4) || croak "can't read NXTMFN from MST: $!";
219          $self->{'NXTMFN'}=unpack("l",$buff) || carp "NXTNFN is zero";          $self->{'NXTMFN'}=unpack("V",$buff) || croak "NXTNFN is zero";
220    
221            print STDERR "## self ",Dumper($self),"\n" if ($self->{debug});
   
   
         print STDERR Dumper($self),"\n" if ($self->{debug});  
222    
223          # open files for later          # open files for later
224          open($self->{'fileXRF'}, $self->{xrf_file}) || croak "can't open '$self->{xrf_file}': $!";          open($self->{'fileXRF'}, $self->{xrf_file}) || croak "can't open '$self->{xrf_file}': $!";
225            binmode($self->{'fileXRF'});
226    
227          $self ? return $self : return undef;          $self ? return $self : return undef;
228  }  }
# Line 221  sub count { Line 240  sub count {
240          return $self->{'NXTMFN'} - 1;          return $self->{'NXTMFN'} - 1;
241  }  }
242    
 =head2 read_cnt  
   
 Read content of C<.CNT> file and return hash containing it.  
   
   print Dumper($isis->read_cnt);  
   
 This function is not used by module (C<.CNT> files are not required for this  
 module to work), but it can be useful to examine your index (while debugging  
 for example).  
   
 =cut  
   
 sub read_cnt  {  
         my $self = shift;  
   
         croak "missing CNT file in ",$self->{isisdb} unless ($self->{cnt_file});  
   
         # Get the index information from $db.CNT  
     
         open(fileCNT, $self->{cnt_file}) || croak "can't read '$self->{cnt_file}': $!";  
   
         my $buff;  
   
         read(fileCNT, $buff, 26);  
         $self->unpack_cnt($buff);  
   
         read(fileCNT, $buff, 26);  
         $self->unpack_cnt($buff);  
   
         close(fileCNT);  
   
         return $self->{cnt};  
 }  
   
 =head2 unpack_cnt  
   
 Unpack one of two 26 bytes fixed length record in C<.CNT> file.  
   
 Here is definition of record:  
   
  off key        description                             size  
   0: IDTYPE     BTree type                              s  
   2: ORDN       Nodes Order                             s  
   4: ORDF       Leafs Order                             s  
   6: N          Number of Memory buffers for nodes      s  
   8: K          Number of buffers for first level index s  
  10: LIV        Current number of Index Levels          s  
  12: POSRX      Pointer to Root Record in N0x           l  
  16: NMAXPOS    Next Available position in N0x          l  
  20: FMAXPOS    Next available position in L0x          l  
  24: ABNORMAL   Formal BTree normality indicator        s  
  length: 26 bytes  
   
 This will fill C<$self> object under C<cnt> with hash. It's used by C<read_cnt>.  
   
 =cut  
   
 sub unpack_cnt {  
         my $self = shift;  
   
         my @flds = qw(ORDN ORDF N K LIV POSRX NMAXPOS FMAXPOS ABNORMAL);  
   
         my $buff = shift || return;  
         my @arr = unpack("ssssssllls", $buff);  
   
         print STDERR "unpack_cnt: ",join(" ",@arr),"\n" if ($self->{'debug'});  
   
         my $IDTYPE = shift @arr;  
         foreach (@flds) {  
                 $self->{cnt}->{$IDTYPE}->{$_} = abs(shift @arr);  
         }  
 }  
   
243  =head2 fetch  =head2 fetch
244    
245  Read record with selected MFN  Read record with selected MFN
# Line 334  sub fetch { Line 280  sub fetch {
280    
281          # read XRFMFB abd XRFMFP          # read XRFMFB abd XRFMFP
282          read($self->{'fileXRF'}, $buff, 4);          read($self->{'fileXRF'}, $buff, 4);
283          my $pointer=unpack("l",$buff) || carp "pointer is null";          my $pointer=unpack("V",$buff);
284            if (! $pointer) {
285                    if ($self->{include_deleted}) {
286                            return;
287                    } else {
288                            warn "pointer for MFN $mfn is null\n";
289                            return;
290                    }
291            }
292    
293          # check for logically deleted record          # check for logically deleted record
294          if ($pointer < 0) {          if ($pointer & 0x80000000) {
295                  print STDERR "## record $mfn is logically deleted\n" if ($self->{debug});                  print STDERR "## record $mfn is logically deleted\n" if ($self->{debug});
296                  $self->{deleted} = $mfn;                  $self->{deleted} = $mfn;
297    
298                  return unless $self->{include_deleted};                  return unless $self->{include_deleted};
299    
300                  $pointer = abs($pointer);                  # abs
301                    $pointer = ($pointer ^ 0xffffffff) + 1;
302          }          }
303    
304          my $XRFMFB = int($pointer/2048);          my $XRFMFB = int($pointer/2048);
# Line 358  sub fetch { Line 313  sub fetch {
313    
314          # Get Record Information          # Get Record Information
315    
316          seek($self->{'fileMST'},$blk_off,0);          seek($self->{'fileMST'},$blk_off,0) || croak "can't seek to $blk_off: $!";
317    
318          read($self->{'fileMST'}, $buff, 4);          read($self->{'fileMST'}, $buff, 4) || croak "can't read 4 bytes at offset $blk_off from MST file: $!";
319          my $value=unpack("l",$buff);          my $value=unpack("V",$buff);
320    
321          print STDERR "## offset for rowid $value is $blk_off (blk $XRFMFB off $XRFMFP)\n" if ($self->{debug});          print STDERR "## offset for rowid $value is $blk_off (blk $XRFMFB off $XRFMFP)\n" if ($self->{debug});
322    
# Line 378  sub fetch { Line 333  sub fetch {
333    
334          read($self->{'fileMST'}, $buff, 14);          read($self->{'fileMST'}, $buff, 14);
335    
336          my ($MFRL,$MFBWB,$MFBWP,$BASE,$NVF,$STATUS) = unpack("slssss", $buff);          my ($MFRL,$MFBWB,$MFBWP,$BASE,$NVF,$STATUS) = unpack("vVvvvv", $buff);
337    
338          print STDERR "## MFRL: $MFRL MFBWB: $MFBWB MFBWP: $MFBWP BASE: $BASE NVF: $NVF STATUS: $STATUS\n" if ($self->{debug});          print STDERR "## MFRL: $MFRL MFBWB: $MFBWB MFBWP: $MFBWP BASE: $BASE NVF: $NVF STATUS: $STATUS\n" if ($self->{debug});
339    
# Line 398  sub fetch { Line 353  sub fetch {
353    
354          for (my $i = 0 ; $i < $NVF ; $i++) {          for (my $i = 0 ; $i < $NVF ; $i++) {
355    
356                  my ($TAG,$POS,$LEN) = unpack("sss", substr($buff,$i * 6, 6));                  my ($TAG,$POS,$LEN) = unpack("vvv", substr($buff,$i * 6, 6));
357    
358                  print STDERR "## TAG: $TAG POS: $POS LEN: $LEN\n" if ($self->{debug});                  print STDERR "## TAG: $TAG POS: $POS LEN: $LEN\n" if ($self->{debug});
359    
# Line 439  sub fetch { Line 394  sub fetch {
394          return $self->{'record'};          return $self->{'record'};
395  }  }
396    
397    =head2 mfn
398    
399    Returns current MFN position
400    
401      my $mfn = $isis->mfn;
402    
403    =cut
404    
405    # This function should be simple return $self->{current_mfn},
406    # but if new is called with _hack_mfn it becomes setter.
407    # It's useful in tests when setting $isis->{record} directly
408    
409    sub mfn {
410            my $self = shift;
411            return $self->{current_mfn};
412    };
413    
414    
415  =head2 to_ascii  =head2 to_ascii
416    
417  Returns ASCII output of record with specified MFN  Returns ASCII output of record with specified MFN
# Line 462  sub to_ascii { Line 435  sub to_ascii {
435    
436          my $mfn = shift || croak "need MFN";          my $mfn = shift || croak "need MFN";
437    
438          my $rec = $self->fetch($mfn);          my $rec = $self->fetch($mfn) || return;
439    
440          my $out = "0\t$mfn";          my $out = "0\t$mfn";
441    
# Line 518  which will be used for identifiers, C<i1 Line 491  which will be used for identifiers, C<i1
491               }               }
492             ],             ],
493    
494    In case there are repeatable subfields in record, this will create
495    following structure:
496    
497      '900' => [ {
498            'a' => [ 'foo', 'bar', 'baz' ],
499      }]
500    
501    Or in more complex example of
502    
503      902   ^aa1^aa2^aa3^bb1^aa4^bb2^cc1^aa5
504    
505    it will create
506    
507      902   => [
508            { a => ["a1", "a2", "a3", "a4", "a5"], b => ["b1", "b2"], c => "c1" },
509      ],
510    
511    This behaviour can be changed using C<join_subfields_with> option to L</new>,
512    in which case C<to_hash> will always create single value for each subfield.
513    This will change result to:
514    
515    
516    
517  This method will also create additional field C<000> with MFN.  This method will also create additional field C<000> with MFN.
518    
519    There is also more elaborative way to call C<to_hash> like this:
520    
521      my $hash = $isis->to_hash({
522            mfn => 42,
523            include_subfields => 1,
524      });
525    
526    Each option controll creation of hash:
527    
528    =over 4
529    
530    =item mfn
531    
532    Specify MFN number of record
533    
534    =item include_subfields
535    
536    This option will create additional key in hash called C<subfields> which will
537    have original record subfield order and index to that subfield like this:
538    
539      902   => [ {
540            a => ["a1", "a2", "a3", "a4", "a5"],
541            b => ["b1", "b2"],
542            c => "c1",
543            subfields => ["a", 0, "a", 1, "a", 2, "b", 0, "a", 3, "b", 1, "c", 0, "a", 4],
544      } ],
545    
546    =item join_subfields_with
547    
548    Define delimiter which will be used to join repeatable subfields. You can
549    specify option here instead in L</new> if you want to have per-record control.
550    
551    =back
552    
553  =cut  =cut
554    
555  sub to_hash {  sub to_hash {
556          my $self = shift;          my $self = shift;
557    
558    
559          my $mfn = shift || confess "need mfn!";          my $mfn = shift || confess "need mfn!";
560            my $arg;
561    
562            if (ref($mfn) eq 'HASH') {
563                    $arg = $mfn;
564                    $mfn = $arg->{mfn} || confess "need mfn in arguments";
565            }
566    
567          # init record to include MFN as field 000          # init record to include MFN as field 000
568          my $rec = { '000' => [ $mfn ] };          my $rec = { '000' => [ $mfn ] };
569    
570          my $row = $self->fetch($mfn);          my $row = $self->fetch($mfn) || return;
571    
572          foreach my $k (keys %{$row}) {          my $j_rs = $arg->{join_subfields_with};
573                  foreach my $l (@{$row->{$k}}) {          $j_rs = $self->{join_subfields_with} unless(defined($j_rs));
574            my $i_sf = $arg->{include_subfields};
575    
576            foreach my $f_nr (keys %{$row}) {
577                    foreach my $l (@{$row->{$f_nr}}) {
578    
579                          # filter output                          # filter output
580                          $l = $self->{'hash_filter'}->($l) if ($self->{'hash_filter'});                          if ($self->{'hash_filter'}) {
581                                    $l = $self->{'hash_filter'}->($l, $f_nr);
582                                    next unless defined($l);
583                            }
584    
585                          my $val;                          my $val;
586                            my $r_sf;       # repeatable subfields in this record
587    
588                          # has identifiers?                          # has identifiers?
589                          ($val->{'i1'},$val->{'i2'}) = ($1,$2) if ($l =~ s/^([01 #])([01 #])\^/\^/);                          ($val->{'i1'},$val->{'i2'}) = ($1,$2) if ($l =~ s/^([01 #])([01 #])\^/\^/);
# Line 547  sub to_hash { Line 592  sub to_hash {
592                          if ($l =~ m/\^/) {                          if ($l =~ m/\^/) {
593                                  foreach my $t (split(/\^/,$l)) {                                  foreach my $t (split(/\^/,$l)) {
594                                          next if (! $t);                                          next if (! $t);
595                                          $val->{substr($t,0,1)} = substr($t,1);                                          my ($sf,$v) = (substr($t,0,1), substr($t,1));
596                                            # XXX this might be option, but why?
597                                            next unless ($v);
598    #                                       warn "### $f_nr^$sf:$v",$/ if ($self->{debug} > 1);
599    
600                                            if (ref( $val->{$sf} ) eq 'ARRAY') {
601    
602                                                    push @{ $val->{$sf} }, $v;
603    
604                                                    # record repeatable subfield it it's offset
605                                                    push @{ $val->{subfields} }, ( $sf, $#{ $val->{$sf} } ) if (! $j_rs && $i_sf);
606                                                    $r_sf->{$sf}++;
607    
608                                            } elsif (defined( $val->{$sf} )) {
609    
610                                                    # convert scalar field to array
611                                                    $val->{$sf} = [ $val->{$sf}, $v ];
612    
613                                                    push @{ $val->{subfields} }, ( $sf, 1 ) if (! $j_rs && $i_sf);
614                                                    $r_sf->{$sf}++;
615    
616                                            } else {
617                                                    $val->{$sf} = $v;
618                                                    push @{ $val->{subfields} }, ( $sf, 0 ) if ($i_sf);
619                                            }
620                                  }                                  }
621                          } else {                          } else {
622                                  $val = $l;                                  $val = $l;
623                          }                          }
624    
625                          push @{$rec->{$k}}, $val;                          if ($j_rs) {
626                                    map {
627                                            $val->{$_} = join($j_rs, @{ $val->{$_} });
628                                    } keys %$r_sf
629                            }
630    
631                            push @{$rec->{$f_nr}}, $val;
632                  }                  }
633          }          }
634    
# Line 574  sub tag_name { Line 649  sub tag_name {
649          return $self->{'TagName'}->{$tag} || $tag;          return $self->{'TagName'}->{$tag} || $tag;
650  }  }
651    
652    
653    =head2 read_cnt
654    
655    Read content of C<.CNT> file and return hash containing it.
656    
657      print Dumper($isis->read_cnt);
658    
659    This function is not used by module (C<.CNT> files are not required for this
660    module to work), but it can be useful to examine your index (while debugging
661    for example).
662    
663    =cut
664    
665    sub read_cnt  {
666            my $self = shift;
667    
668            croak "missing CNT file in ",$self->{isisdb} unless ($self->{cnt_file});
669    
670            # Get the index information from $db.CNT
671      
672            open(my $fileCNT, $self->{cnt_file}) || croak "can't read '$self->{cnt_file}': $!";
673            binmode($fileCNT);
674    
675            my $buff;
676    
677            read($fileCNT, $buff, 26) || croak "can't read first table from CNT: $!";
678            $self->unpack_cnt($buff);
679    
680            read($fileCNT, $buff, 26) || croak "can't read second table from CNT: $!";
681            $self->unpack_cnt($buff);
682    
683            close($fileCNT);
684    
685            return $self->{cnt};
686    }
687    
688    =head2 unpack_cnt
689    
690    Unpack one of two 26 bytes fixed length record in C<.CNT> file.
691    
692    Here is definition of record:
693    
694     off key        description                             size
695      0: IDTYPE     BTree type                              s
696      2: ORDN       Nodes Order                             s
697      4: ORDF       Leafs Order                             s
698      6: N          Number of Memory buffers for nodes      s
699      8: K          Number of buffers for first level index s
700     10: LIV        Current number of Index Levels          s
701     12: POSRX      Pointer to Root Record in N0x           l
702     16: NMAXPOS    Next Available position in N0x          l
703     20: FMAXPOS    Next available position in L0x          l
704     24: ABNORMAL   Formal BTree normality indicator        s
705     length: 26 bytes
706    
707    This will fill C<$self> object under C<cnt> with hash. It's used by C<read_cnt>.
708    
709    =cut
710    
711    sub unpack_cnt {
712            my $self = shift;
713    
714            my @flds = qw(ORDN ORDF N K LIV POSRX NMAXPOS FMAXPOS ABNORMAL);
715    
716            my $buff = shift || return;
717            my @arr = unpack("vvvvvvVVVv", $buff);
718    
719            print STDERR "unpack_cnt: ",join(" ",@arr),"\n" if ($self->{'debug'});
720    
721            my $IDTYPE = shift @arr;
722            foreach (@flds) {
723                    $self->{cnt}->{$IDTYPE}->{$_} = abs(shift @arr);
724            }
725    }
726    
727  1;  1;
728    
729  =head1 BUGS  =head1 BUGS
# Line 591  module with databases from programs othe Line 741  module with databases from programs othe
741  tested this against ouput of one C<isis.dll>-based application, but I don't  tested this against ouput of one C<isis.dll>-based application, but I don't
742  know any details about it's version.  know any details about it's version.
743    
744    =head1 VERSIONS
745    
746    As this is young module, new features are added in subsequent version. It's
747    a good idea to specify version when using this module like this:
748    
749      use Biblio::Isis 0.21
750    
751    Below is list of changes in specific version of module (so you can target
752    older versions if you really have to):
753    
754    =over 8
755    
756    =item 0.22
757    
758    Added field number when calling C<hash_filter>
759    
760    =item 0.21
761    
762    Added C<join_subfields_with> to L</new> and L</to_hash>.
763    
764    Added C<include_subfields> to L</to_hash>.
765    
766    =item 0.20
767    
768    Added C<< $isis->mfn >>, support for repeatable subfields and
769    C<< $isis->to_hash({ mfn => 42, ... }) >> calling convention
770    
771    =back
772    
773  =head1 AUTHOR  =head1 AUTHOR
774    
775          Dobrica Pavlinusic          Dobrica Pavlinusic
# Line 612  LICENSE file included with this module. Line 791  LICENSE file included with this module.
791    
792  =head1 SEE ALSO  =head1 SEE ALSO
793    
794    L<Biblio::Isis::Manual> for CDS/ISIS manual appendix F, G and H which describe file format
795    
796  OpenIsis web site L<http://www.openisis.org>  OpenIsis web site L<http://www.openisis.org>
797    
798  perl4lib site L<http://perl4lib.perl.org>  perl4lib site L<http://perl4lib.perl.org>
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