/[Biblio-Isis]/trunk/lib/Biblio/Isis.pm
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trunk/IsisDB.pm revision 18 by dpavlin, Thu Dec 30 22:40:53 2004 UTC trunk/lib/Biblio/Isis.pm revision 50 by dpavlin, Fri Jul 7 21:11:01 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     = 0.07;          $VERSION     = 0.20;
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    
31    for(my $mfn = 1; $mfn <= $isis->{'maxmfn'}; $mfn++) {    for(my $mfn = 1; $mfn <= $isis->count; $mfn++) {
32          print $isis->to_ascii($mfn),"\n";          print $isis->to_ascii($mfn),"\n";
33    }    }
34    
35  =head1 DESCRIPTION  =head1 DESCRIPTION
36    
37  This module will read ISIS databases created by DOS CDS/ISIS, WinIsis or  This module will read ISIS databases created by DOS CDS/ISIS, WinIsis or
38  IsisMarc. It can be used as perl-only alternative to OpenIsis module.  IsisMarc. It can be used as perl-only alternative to OpenIsis module which
39    seems to depriciate it's old C<XS> bindings for perl.
40    
41  It can create hash values from data in ISIS database (using C<to_hash>),  It can create hash values from data in ISIS database (using C<to_hash>),
42  ASCII dump (using C<to_ascii>) or just hash with field names and packed  ASCII dump (using C<to_ascii>) or just hash with field names and packed
# Line 50  fields which are zero sized will be fill Line 49  fields which are zero sized will be fill
49  It also has support for identifiers (only if ISIS database is created by  It also has support for identifiers (only if ISIS database is created by
50  IsisMarc), see C<to_hash>.  IsisMarc), see C<to_hash>.
51    
52  This will module will always be slower than OpenIsis module which use C  This module will always be slower than OpenIsis module which use C
53  library. However, since it's written in perl, it's platform independent (so  library. However, since it's written in perl, it's platform independent (so
54  you don't need C compiler), and can be easily modified. I hope that it  you don't need C compiler), and can be easily modified. I hope that it
55  creates data structures which are easier to use than ones created by  creates data structures which are easier to use than ones created by
# Line 80  rarely an issue). Line 79  rarely an issue).
79    
80  Open ISIS database  Open ISIS database
81    
82   my $isis = new IsisDB(   my $isis = new Biblio::Isis(
83          isisdb => './cds/cds',          isisdb => './cds/cds',
84          read_fdt => 1,          read_fdt => 1,
85          include_deleted => 1,          include_deleted => 1,
# Line 122  Dump a B<lot> of debugging output. Line 121  Dump a B<lot> of debugging output.
121    
122  =back  =back
123    
 It will also set C<$isis-E<gt>{'maxmfn'}> which is maximum MFN stored in database.  
   
124  =cut  =cut
125    
126  sub new {  sub new {
# Line 148  sub new { Line 145  sub new {
145          push @must_exist, "fdt" if ($self->{read_fdt});          push @must_exist, "fdt" if ($self->{read_fdt});
146    
147          foreach my $ext (@must_exist) {          foreach my $ext (@must_exist) {
148                  confess "missing ",uc($ext)," file in ",$self->{isisdb} unless ($self->{$ext."_file"});                  unless ($self->{$ext."_file"}) {
149                            carp "missing ",uc($ext)," file in ",$self->{isisdb};
150                            return;
151                    }
152          }          }
153    
154          print STDERR "## using files: ",join(" ",@isis_files),"\n" if ($self->{debug});          if ($self->{debug}) {
155                    print STDERR "## using files: ",join(" ",@isis_files),"\n";
156                    eval "use Data::Dump";
157    
158                    if (! $@) {
159                            *Dumper = *Data::Dump::dump;
160                    } else {
161                            use Data::Dumper;
162                    }
163            }
164    
165          # if you want to read .FDT file use read_fdt argument when creating class!          # if you want to read .FDT file use read_fdt argument when creating class!
166          if ($self->{read_fdt} && -e $self->{fdt_file}) {          if ($self->{read_fdt} && -e $self->{fdt_file}) {
# Line 159  sub new { Line 168  sub new {
168                  # read the $db.FDT file for tags                  # read the $db.FDT file for tags
169                  my $fieldzone=0;                  my $fieldzone=0;
170    
171                  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}': $!";
172                    binmode($fileFDT);
173    
174                  while (<fileFDT>) {                  while (<$fileFDT>) {
175                          chomp;                          chomp;
176                          if ($fieldzone) {                          if ($fieldzone) {
177                                  my $name=substr($_,0,30);                                  my $name=substr($_,0,30);
# Line 178  sub new { Line 188  sub new {
188                          }                          }
189                  }                  }
190                                    
191                  close(fileFDT);                  close($fileFDT);
192          }          }
193    
194          # Get the Maximum MFN from $db.MST          # Get the Maximum MFN from $db.MST
195    
196          open($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}': $!";
197            binmode($self->{'fileMST'});
198    
199          # MST format:   (* = 32 bit signed)          # MST format:   (* = 32 bit signed)
200          # CTLMFN*       always 0          # CTLMFN*       always 0
# Line 191  sub new { Line 202  sub new {
202          # NXTMFB*       last block allocated to master file          # NXTMFB*       last block allocated to master file
203          # NXTMFP        offset to next available position in last block          # NXTMFP        offset to next available position in last block
204          # MFTYPE        always 0 for user db file (1 for system)          # MFTYPE        always 0 for user db file (1 for system)
205          seek($self->{'fileMST'},4,0);          seek($self->{'fileMST'},4,0) || croak "can't seek to offset 0 in MST: $!";
206    
207          my $buff;          my $buff;
208    
209          read($self->{'fileMST'}, $buff, 4);          read($self->{'fileMST'}, $buff, 4) || croak "can't read NXTMFN from MST: $!";
210          $self->{'NXTMFN'}=unpack("l",$buff) || carp "NXTNFN is zero";          $self->{'NXTMFN'}=unpack("V",$buff) || croak "NXTNFN is zero";
   
         # save maximum MFN  
         $self->{'maxmfn'} = $self->{'NXTMFN'} - 1;  
211    
212            print STDERR "## self ",Dumper($self),"\n" if ($self->{debug});
   
   
         print STDERR Dumper($self),"\n" if ($self->{debug});  
213    
214          # open files for later          # open files for later
215          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}': $!";
216            binmode($self->{'fileXRF'});
217    
218          $self ? return $self : return undef;          $self ? return $self : return undef;
219  }  }
220    
221  =head2 read_cnt  =head2 count
222    
223  This function is not really used by module, but can be useful to find info  Return number of records in database
 about your index (if debugging it for example).  
224    
225    print Dumper($isis->read_cnt);    print $isis->count;
226    
227  =cut  =cut
228    
229  sub read_cnt  {  sub count {
230          my $self = shift;          my $self = shift;
231            return $self->{'NXTMFN'} - 1;
         confess "missing CNT file in ",$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}': $!";  
   
         # There is two 26 Bytes fixed lenght records  
   
         #  0: IDTYPE    BTree type                              16  
         #  2: ORDN      Nodes Order                             16  
         #  4: ORDF      Leafs Order                             16  
         #  6: N         Number of Memory buffers for nodes      16  
         #  8: K         Number of buffers for first level index 16  
         # 10: LIV       Current number of Index Levels          16  
         # 12: POSRX*    Pointer to Root Record in N0x           32  
         # 16: NMAXPOS*  Next Available position in N0x          32  
         # 20: FMAXPOS*  Next available position in L0x          32  
         # 24: ABNORMAL  Formal BTree normality indicator        16  
         # length: 26 bytes  
   
         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);  
                 }  
         }  
   
         my $buff;  
   
         read(fileCNT, $buff, 26);  
         $self->unpack_cnt($buff);  
   
         read(fileCNT, $buff, 26);  
         $self->unpack_cnt($buff);  
   
         close(fileCNT);  
   
         return $self->{cnt};  
232  }  }
233    
234  =head2 fetch  =head2 fetch
# Line 296  sub fetch { Line 254  sub fetch {
254    
255          # is mfn allready in memory?          # is mfn allready in memory?
256          my $old_mfn = $self->{'current_mfn'} || -1;          my $old_mfn = $self->{'current_mfn'} || -1;
257          return if ($mfn == $old_mfn);          return $self->{record} if ($mfn == $old_mfn);
258    
259          print STDERR "## fetch: $mfn\n" if ($self->{debug});          print STDERR "## fetch: $mfn\n" if ($self->{debug});
260    
# Line 308  sub fetch { Line 266  sub fetch {
266    
267          my $buff;          my $buff;
268    
269            # delete old record
270            delete $self->{record};
271    
272          # read XRFMFB abd XRFMFP          # read XRFMFB abd XRFMFP
273          read($self->{'fileXRF'}, $buff, 4);          read($self->{'fileXRF'}, $buff, 4);
274          my $pointer=unpack("l",$buff) || carp "pointer is null";          my $pointer=unpack("V",$buff);
275            if (! $pointer) {
276                    if ($self->{include_deleted}) {
277                            return;
278                    } else {
279                            warn "pointer for MFN $mfn is null\n";
280                            return;
281                    }
282            }
283    
284            # check for logically deleted record
285            if ($pointer & 0x80000000) {
286                    print STDERR "## record $mfn is logically deleted\n" if ($self->{debug});
287                    $self->{deleted} = $mfn;
288    
289                    return unless $self->{include_deleted};
290    
291                    # abs
292                    $pointer = ($pointer ^ 0xffffffff) + 1;
293            }
294    
295          my $XRFMFB = int($pointer/2048);          my $XRFMFB = int($pointer/2048);
296          my $XRFMFP = $pointer - ($XRFMFB*2048);          my $XRFMFP = $pointer - ($XRFMFB*2048);
297    
   
298          # (XRFMFB - 1) * 512 + XRFMFP          # (XRFMFB - 1) * 512 + XRFMFP
299          # why do i have to do XRFMFP % 1024 ?          # why do i have to do XRFMFP % 1024 ?
300    
301          my $blk_off = (($XRFMFB - 1) * 512) + ($XRFMFP % 1024);          my $blk_off = (($XRFMFB - 1) * 512) + ($XRFMFP % 512);
302    
303          print STDERR "## pointer: $pointer XRFMFB: $XRFMFB XRFMFP: $XRFMFP offset: $blk_off\n" if ($self->{'debug'});          print STDERR "## pointer: $pointer XRFMFB: $XRFMFB XRFMFP: $XRFMFP offset: $blk_off\n" if ($self->{'debug'});
304    
305          # Get Record Information          # Get Record Information
306    
307          seek($self->{'fileMST'},$blk_off,0);          seek($self->{'fileMST'},$blk_off,0) || croak "can't seek to $blk_off: $!";
308    
309          read($self->{'fileMST'}, $buff, 4);          read($self->{'fileMST'}, $buff, 4) || croak "can't read 4 bytes at offset $blk_off from MST file: $!";
310          my $value=unpack("l",$buff);          my $value=unpack("V",$buff);
311    
312          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});
313    
314          if ($value!=$mfn) {          if ($value!=$mfn) {
315                  carp "Error: MFN ".$mfn." not found in MST(".$value.")";                      if ($value == 0) {
316                  #return;                # XXX deleted record?                          print STDERR "## record $mfn is physically deleted\n" if ($self->{debug});
317          }                          $self->{deleted} = $mfn;
318                            return;
319                    }
320    
321  #       $MFRL=$self->Read16($fileMST);                  carp "Error: MFN ".$mfn." not found in MST file, found $value";    
322  #       $MFBWB=$self->Read32($fileMST);                  return;
323  #       $MFBWP=$self->Read16($fileMST);          }
 #       $BASE=$self->Read16($fileMST);  
 #       $NVF=$self->Read16($fileMST);  
 #       $STATUS=$self->Read16($fileMST);  
324    
325          read($self->{'fileMST'}, $buff, 14);          read($self->{'fileMST'}, $buff, 14);
326    
327          my ($MFRL,$MFBWB,$MFBWP,$BASE,$NVF,$STATUS) = unpack("slssss", $buff);          my ($MFRL,$MFBWB,$MFBWP,$BASE,$NVF,$STATUS) = unpack("vVvvvv", $buff);
328    
329          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});
330    
331          # delete old record          warn "MFRL $MFRL is not even number" unless ($MFRL % 2 == 0);
         delete $self->{record};  
   
         ## FIXME this is a bug  
         if (! $self->{'include_deleted'} && $MFRL < 0) {  
                 print "## logically deleted record $mfn, skipping...\n" if ($self->{debug});  
                 return;  
         }  
332    
333          warn "BASE is not 18+6*NVF" unless ($BASE == 18 + 6 * $NVF);          warn "BASE is not 18+6*NVF" unless ($BASE == 18 + 6 * $NVF);
334    
# Line 373  sub fetch { Line 344  sub fetch {
344    
345          for (my $i = 0 ; $i < $NVF ; $i++) {          for (my $i = 0 ; $i < $NVF ; $i++) {
346    
347  #               $TAG=$self->Read16($fileMST);                  my ($TAG,$POS,$LEN) = unpack("vvv", substr($buff,$i * 6, 6));
 #               $POS=$self->Read16($fileMST);  
 #               $LEN=$self->Read16($fileMST);  
   
                 my ($TAG,$POS,$LEN) = unpack("sss", substr($buff,$i * 6, 6));  
348    
349                  print STDERR "## TAG: $TAG POS: $POS LEN: $LEN\n" if ($self->{debug});                  print STDERR "## TAG: $TAG POS: $POS LEN: $LEN\n" if ($self->{debug});
350    
# Line 413  sub fetch { Line 380  sub fetch {
380    
381          $self->{'current_mfn'} = $mfn;          $self->{'current_mfn'} = $mfn;
382    
383          print Dumper($self),"\n" if ($self->{debug});          print STDERR Dumper($self),"\n" if ($self->{debug});
384    
385          return $self->{'record'};          return $self->{'record'};
386  }  }
387    
388  =head2 to_ascii  =head2 to_ascii
389    
390  Dump ASCII output of record with specified MFN  Returns ASCII output of record with specified MFN
391    
392    print $isis->to_ascii(42);    print $isis->to_ascii(42);
393    
394  It outputs something like this:  This outputs something like this:
395    
396    210   ^aNew York^cNew York University press^dcop. 1988    210   ^aNew York^cNew York University press^dcop. 1988
397    990   2140    990   2140
# Line 441  sub to_ascii { Line 408  sub to_ascii {
408    
409          my $mfn = shift || croak "need MFN";          my $mfn = shift || croak "need MFN";
410    
411          my $rec = $self->fetch($mfn);          my $rec = $self->fetch($mfn) || return;
412    
413          my $out = "0\t$mfn";          my $out = "0\t$mfn";
414    
# Line 461  Read record with specified MFN and conve Line 428  Read record with specified MFN and conve
428    
429    my $hash = $isis->to_hash($mfn);    my $hash = $isis->to_hash($mfn);
430    
431  It has ability to convert characters (using C<hash_filter> from ISIS  It has ability to convert characters (using C<hash_filter>) from ISIS
432  database before creating structures enabling character re-mapping or quick  database before creating structures enabling character re-mapping or quick
433  fix-up of data.  fix-up of data.
434    
# Line 497  which will be used for identifiers, C<i1 Line 464  which will be used for identifiers, C<i1
464               }               }
465             ],             ],
466    
467    In case there are repeatable subfields in record, this will create
468    following structure:
469    
470      '900' => [ {
471            'a' => [ 'foo', 'bar', 'baz' ],
472      }]
473    
474  This method will also create additional field C<000> with MFN.  This method will also create additional field C<000> with MFN.
475    
476  =cut  =cut
# Line 509  sub to_hash { Line 483  sub to_hash {
483          # init record to include MFN as field 000          # init record to include MFN as field 000
484          my $rec = { '000' => [ $mfn ] };          my $rec = { '000' => [ $mfn ] };
485    
486          my $row = $self->fetch($mfn);          my $row = $self->fetch($mfn) || return;
487    
488          foreach my $k (keys %{$row}) {          foreach my $k (keys %{$row}) {
489                  foreach my $l (@{$row->{$k}}) {                  foreach my $l (@{$row->{$k}}) {
490    
491                          # filter output                          # filter output
492                          $l = $self->{'hash_filter'}->($l) if ($self->{'hash_filter'});                          if ($self->{'hash_filter'}) {
493                                    $l = $self->{'hash_filter'}->($l);
494                                    next unless defined($l);
495                            }
496    
497                          my $val;                          my $val;
498    
499                          # has identifiers?                          # has identifiers?
500                          ($val->{'i1'},$val->{'i2'}) = ($1,$2) if ($l =~ s/^([01 #])([01 #])//);                          ($val->{'i1'},$val->{'i2'}) = ($1,$2) if ($l =~ s/^([01 #])([01 #])\^/\^/);
501    
502                          # has subfields?                          # has subfields?
503                          if ($l =~ m/\^/) {                          if ($l =~ m/\^/) {
504                                  foreach my $t (split(/\^/,$l)) {                                  foreach my $t (split(/\^/,$l)) {
505                                          next if (! $t);                                          next if (! $t);
506                                          $val->{substr($t,0,1)} = substr($t,1);                                          my ($sf,$v) = (substr($t,0,1), substr($t,1));
507                                            warn "### $k^$sf:$v",$/ if ($self->{debug} > 1);
508                                            if (ref( $val->{$sf} ) eq 'ARRAY') {
509                                                    push @{ $val->{$sf} }, $v;
510                                            } elsif (defined( $val->{$sf} )) {
511                                                    # convert scalar field to array
512                                                    $val->{$sf} = [ $val->{$sf}, $v ];
513                                            } else {
514                                                    $val->{$sf} = $v;
515                                            }
516                                  }                                  }
517                          } else {                          } else {
518                                  $val = $l;                                  $val = $l;
# Line 553  sub tag_name { Line 539  sub tag_name {
539          return $self->{'TagName'}->{$tag} || $tag;          return $self->{'TagName'}->{$tag} || $tag;
540  }  }
541    
542    
543    =head2 read_cnt
544    
545    Read content of C<.CNT> file and return hash containing it.
546    
547      print Dumper($isis->read_cnt);
548    
549    This function is not used by module (C<.CNT> files are not required for this
550    module to work), but it can be useful to examine your index (while debugging
551    for example).
552    
553    =cut
554    
555    sub read_cnt  {
556            my $self = shift;
557    
558            croak "missing CNT file in ",$self->{isisdb} unless ($self->{cnt_file});
559    
560            # Get the index information from $db.CNT
561      
562            open(my $fileCNT, $self->{cnt_file}) || croak "can't read '$self->{cnt_file}': $!";
563            binmode($fileCNT);
564    
565            my $buff;
566    
567            read($fileCNT, $buff, 26) || croak "can't read first table from CNT: $!";
568            $self->unpack_cnt($buff);
569    
570            read($fileCNT, $buff, 26) || croak "can't read second table from CNT: $!";
571            $self->unpack_cnt($buff);
572    
573            close($fileCNT);
574    
575            return $self->{cnt};
576    }
577    
578    =head2 unpack_cnt
579    
580    Unpack one of two 26 bytes fixed length record in C<.CNT> file.
581    
582    Here is definition of record:
583    
584     off key        description                             size
585      0: IDTYPE     BTree type                              s
586      2: ORDN       Nodes Order                             s
587      4: ORDF       Leafs Order                             s
588      6: N          Number of Memory buffers for nodes      s
589      8: K          Number of buffers for first level index s
590     10: LIV        Current number of Index Levels          s
591     12: POSRX      Pointer to Root Record in N0x           l
592     16: NMAXPOS    Next Available position in N0x          l
593     20: FMAXPOS    Next available position in L0x          l
594     24: ABNORMAL   Formal BTree normality indicator        s
595     length: 26 bytes
596    
597    This will fill C<$self> object under C<cnt> with hash. It's used by C<read_cnt>.
598    
599    =cut
600    
601    sub unpack_cnt {
602            my $self = shift;
603    
604            my @flds = qw(ORDN ORDF N K LIV POSRX NMAXPOS FMAXPOS ABNORMAL);
605    
606            my $buff = shift || return;
607            my @arr = unpack("vvvvvvVVVv", $buff);
608    
609            print STDERR "unpack_cnt: ",join(" ",@arr),"\n" if ($self->{'debug'});
610    
611            my $IDTYPE = shift @arr;
612            foreach (@flds) {
613                    $self->{cnt}->{$IDTYPE}->{$_} = abs(shift @arr);
614            }
615    }
616    
617  1;  1;
618    
619  =head1 BUGS  =head1 BUGS
620    
621  This module has been very lightly tested. Use with caution and report bugs.  Some parts of CDS/ISIS documentation are not detailed enough to exmplain
622    some variations in input databases which has been tested with this module.
623    When I was in doubt, I assumed that OpenIsis's implementation was right
624    (except for obvious bugs).
625    
626    However, every effort has been made to test this module with as much
627    databases (and programs that create them) as possible.
628    
629    I would be very greatful for success or failure reports about usage of this
630    module with databases from programs other than WinIsis and IsisMarc. I had
631    tested this against ouput of one C<isis.dll>-based application, but I don't
632    know any details about it's version.
633    
634  =head1 AUTHOR  =head1 AUTHOR
635    
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