/[Biblio-Isis]/trunk/lib/Biblio/Isis.pm
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trunk/IsisDB.pm revision 15 by dpavlin, Wed Dec 29 22:46:40 2004 UTC trunk/lib/Biblio/Isis.pm revision 45 by dpavlin, Thu Jul 6 20:31:46 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 Data::Dumper;  use File::Glob qw(:globally :nocase);
6    
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     = 0.05;          $VERSION     = 0.14;
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 18  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 48  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 78  rarely an issue). Line 79  rarely an issue).
79    
80  Open ISIS database  Open ISIS database
81    
82   my $isis = new IsisDB(   my $isis = new Biblio::Isis(
83          isisdb => './cds/cds',          isisdb => './cds/cds',
84          read_fdt => 1,          read_fdt => 1,
85          include_deleted => 1,          include_deleted => 1,
# Line 96  Options are described below: Line 97  Options are described below:
97  =item isisdb  =item isisdb
98    
99  This is full or relative path to ISIS database files which include  This is full or relative path to ISIS database files which include
100  common prefix of C<.FDT>, C<.MST>, C<.CNT>, C<.XRF> and C<.MST> files.  common prefix of C<.MST>, and C<.XRF> and optionally C<.FDT> (if using
101    C<read_fdt> option) files.
102    
103  In this example it uses C<./cds/cds.MST> and related files.  In this example it uses C<./cds/cds.MST> and related files.
104    
# Line 119  Dump a B<lot> of debugging output. Line 121  Dump a B<lot> of debugging output.
121    
122  =back  =back
123    
 It will also set C<$isis-E<gt>{'maxmfn'}> which is maximum MFN stored in database.  
   
124  =cut  =cut
125    
126  sub new {  sub new {
# Line 134  sub new { Line 134  sub new {
134                  $self->{$v} = {@_}->{$v};                  $self->{$v} = {@_}->{$v};
135          }          }
136    
137            my @isis_files = grep(/\.(FDT|MST|XRF|CNT)$/i,glob($self->{isisdb}."*"));
138    
139            foreach my $f (@isis_files) {
140                    my $ext = $1 if ($f =~ m/\.(\w\w\w)$/);
141                    $self->{lc($ext)."_file"} = $f;
142            }
143    
144            my @must_exist = qw(mst xrf);
145            push @must_exist, "fdt" if ($self->{read_fdt});
146    
147            foreach my $ext (@must_exist) {
148                    unless ($self->{$ext."_file"}) {
149                            carp "missing ",uc($ext)," file in ",$self->{isisdb};
150                            return;
151                    }
152            }
153    
154            if ($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 ({@_}->{read_fdt} && -e $self->{isisdb}.".FDT") {          if ($self->{read_fdt} && -e $self->{fdt_file}) {
167    
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, $self->{isisdb}.".FDT") || croak "can't read '$self->{isisdb}.FDT': $!";                  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 159  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 $db.MST
195    
196          open(fileMST,$self->{isisdb}.".MST") || croak "can't read '$self->{isisdb}.MST': $!";          open($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 172  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(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(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'} = $self->{'NXTMFN'} - 1;  
211    
212          close(fileMST);          print STDERR "## self ",Dumper($self),"\n" if ($self->{debug});
213    
214          # Get the index information from $db.CNT          # open files for later
215              open($self->{'fileXRF'}, $self->{xrf_file}) || croak "can't open '$self->{xrf_file}': $!";
216          open(fileCNT, $self->{isisdb}.".CNT") || croak "can't read '$self->{isisdb}.CNT': $!";          binmode($self->{'fileXRF'});
   
         # 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 "unpack_cnt: ",join(" ",@arr),"\n" if ($self->{'debug'});  
   
                 my $IDTYPE = shift @arr;  
                 foreach (@flds) {  
                         $self->{$IDTYPE}->{$_} = abs(shift @arr);  
                 }  
         }  
   
         read(fileCNT, $buff, 26);  
         $self->unpack_cnt($buff);  
   
         read(fileCNT, $buff, 26);  
         $self->unpack_cnt($buff);  
217    
218            $self ? return $self : return undef;
219    }
220    
221          close(fileCNT);  =head2 count
222    
223          print Dumper($self),"\n" if ($self->{debug});  Return number of records in database
224    
225          # open files for later    print $isis->count;
         open($self->{'fileXRF'}, $self->{isisdb}.".XRF") || croak "can't open '$self->{isisdb}.XRF': $!";  
226    
227          open($self->{'fileMST'}, $self->{isisdb}.".MST") || croak "can't open '$self->{isisdb}.MST': $!";  =cut
228    
229          $self ? return $self : return undef;  sub count {
230            my $self = shift;
231            return $self->{'NXTMFN'} - 1;
232  }  }
233    
234  =head2 fetch  =head2 fetch
# Line 258  sub fetch { Line 252  sub fetch {
252    
253          my $mfn = shift || croak "fetch needs MFN as argument!";          my $mfn = shift || croak "fetch needs MFN as argument!";
254    
255          print "fetch: $mfn\n" if ($self->{debug});          # is mfn allready in memory?
256            my $old_mfn = $self->{'current_mfn'} || -1;
257            return $self->{record} if ($mfn == $old_mfn);
258    
259            print STDERR "## fetch: $mfn\n" if ($self->{debug});
260    
261          # XXX check this?          # XXX check this?
262          my $mfnpos=($mfn+int(($mfn-1)/127))*4;          my $mfnpos=($mfn+int(($mfn-1)/127))*4;
263    
264          print "seeking to $mfnpos in file '$self->{isisdb}.XRF'\n" if ($self->{debug});          print STDERR "## seeking to $mfnpos in file '$self->{xrf_file}'\n" if ($self->{debug});
265          seek($self->{'fileXRF'},$mfnpos,0);          seek($self->{'fileXRF'},$mfnpos,0);
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          print "XRFMFB: $XRFMFB XRFMFP: $XRFMFP\n" if ($self->{debug});          # (XRFMFB - 1) * 512 + XRFMFP
299            # why do i have to do XRFMFP % 1024 ?
         # XXX fix this to be more readable!!  
         # e.g. (XRFMFB - 1) * 512 + XRFMFP  
300    
301          my $offset = $pointer;          my $blk_off = (($XRFMFB - 1) * 512) + ($XRFMFP % 512);
         my $offset2=int($offset/2048)-1;  
         my $offset22=int($offset/4096);  
         my $offset3=$offset-($offset22*4096);  
         if ($offset3>512) {  
                 $offset3=$offset3-2048;  
         }  
         my $offset4=($offset2*512)+$offset3;  
302    
303          print "$offset - $offset2 - $offset3 - $offset4\n" if ($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($self->{'fileMST'},$offset4,0);          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});
313    
314          if ($value!=$mfn) {          if ($value!=$mfn) {
315  print ("Error: The MFN:".$mfn." is not found in MST(".$value.")");                      if ($value == 0) {
316                  return -1;      # 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 "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};  
332    
333          if (! $self->{'include_deleted'} && $MFRL < 0) {          warn "BASE is not 18+6*NVF" unless ($BASE == 18 + 6 * $NVF);
                 print "## logically deleted record $mfn, skipping...\n" if ($self->{debug});  
                 return;  
         }  
334    
335          # Get Directory Format          # Get Directory Format
336    
# Line 332  print ("Error: The MFN:".$mfn." is not f Line 340  print ("Error: The MFN:".$mfn." is not f
340    
341          read($self->{'fileMST'}, $buff, 6 * $NVF);          read($self->{'fileMST'}, $buff, 6 * $NVF);
342    
343          my $fld_len = 0;          my $rec_len = 0;
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 "TAG: $TAG POS: $POS LEN: $LEN\n" if ($self->{debug});                  print STDERR "## TAG: $TAG POS: $POS LEN: $LEN\n" if ($self->{debug});
350    
351                  # The TAG does not exists in .FDT so we set it to 0.                  # The TAG does not exists in .FDT so we set it to 0.
352                  #                  #
# Line 358  print ("Error: The MFN:".$mfn." is not f Line 362  print ("Error: The MFN:".$mfn." is not f
362                  push @FieldPOS,$POS;                  push @FieldPOS,$POS;
363                  push @FieldLEN,$LEN;                  push @FieldLEN,$LEN;
364    
365                  $fld_len += $LEN;                  $rec_len += $LEN;
366          }          }
367    
368          # Get Variable Fields          # Get Variable Fields
369    
370          read($self->{'fileMST'},$buff,$fld_len);          read($self->{'fileMST'},$buff,$rec_len);
371    
372            print STDERR "## rec_len: $rec_len poc: ",tell($self->{'fileMST'})."\n" if ($self->{debug});
373    
374          for (my $i = 0 ; $i < $NVF ; $i++) {          for (my $i = 0 ; $i < $NVF ; $i++) {
375                  # skip zero-sized fields                  # skip zero-sized fields
# Line 371  print ("Error: The MFN:".$mfn." is not f Line 377  print ("Error: The MFN:".$mfn." is not f
377    
378                  push @{$self->{record}->{$FieldTAG[$i]}}, substr($buff,$FieldPOS[$i],$FieldLEN[$i]);                  push @{$self->{record}->{$FieldTAG[$i]}}, substr($buff,$FieldPOS[$i],$FieldLEN[$i]);
379          }          }
         close(fileMST);  
380    
381          print Dumper($self),"\n" if ($self->{debug});          $self->{'current_mfn'} = $mfn;
382    
383            print STDERR Dumper($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 401  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 421  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 467  sub to_hash { Line 474  sub to_hash {
474          my $mfn = shift || confess "need mfn!";          my $mfn = shift || confess "need mfn!";
475    
476          # init record to include MFN as field 000          # init record to include MFN as field 000
477          my $rec = { '000' => $mfn };          my $rec = { '000' => [ $mfn ] };
478    
479          my $row = $self->fetch($mfn);          my $row = $self->fetch($mfn) || return;
480    
481          foreach my $k (keys %{$row}) {          foreach my $k (keys %{$row}) {
482                  foreach my $l (@{$row->{$k}}) {                  foreach my $l (@{$row->{$k}}) {
483    
484                          # filter output                          # filter output
485                          $l = $self->{'hash_filter'}->($l) if ($self->{'hash_filter'});                          if ($self->{'hash_filter'}) {
486                                    $l = $self->{'hash_filter'}->($l);
487                                    next unless defined($l);
488                            }
489    
490                          my $val;                          my $val;
491    
492                          # has identifiers?                          # has identifiers?
493                          ($val->{'i1'},$val->{'i2'}) = ($1,$2) if ($l =~ s/^([01 #])([01 #])//);                          ($val->{'i1'},$val->{'i2'}) = ($1,$2) if ($l =~ s/^([01 #])([01 #])\^/\^/);
494    
495                          # has subfields?                          # has subfields?
496                          if ($l =~ m/\^/) {                          if ($l =~ m/\^/) {
# Line 513  sub tag_name { Line 523  sub tag_name {
523          return $self->{'TagName'}->{$tag} || $tag;          return $self->{'TagName'}->{$tag} || $tag;
524  }  }
525    
526    
527    =head2 read_cnt
528    
529    Read content of C<.CNT> file and return hash containing it.
530    
531      print Dumper($isis->read_cnt);
532    
533    This function is not used by module (C<.CNT> files are not required for this
534    module to work), but it can be useful to examine your index (while debugging
535    for example).
536    
537    =cut
538    
539    sub read_cnt  {
540            my $self = shift;
541    
542            croak "missing CNT file in ",$self->{isisdb} unless ($self->{cnt_file});
543    
544            # Get the index information from $db.CNT
545      
546            open(my $fileCNT, $self->{cnt_file}) || croak "can't read '$self->{cnt_file}': $!";
547            binmode($fileCNT);
548    
549            my $buff;
550    
551            read($fileCNT, $buff, 26) || croak "can't read first table from CNT: $!";
552            $self->unpack_cnt($buff);
553    
554            read($fileCNT, $buff, 26) || croak "can't read second table from CNT: $!";
555            $self->unpack_cnt($buff);
556    
557            close($fileCNT);
558    
559            return $self->{cnt};
560    }
561    
562    =head2 unpack_cnt
563    
564    Unpack one of two 26 bytes fixed length record in C<.CNT> file.
565    
566    Here is definition of record:
567    
568     off key        description                             size
569      0: IDTYPE     BTree type                              s
570      2: ORDN       Nodes Order                             s
571      4: ORDF       Leafs Order                             s
572      6: N          Number of Memory buffers for nodes      s
573      8: K          Number of buffers for first level index s
574     10: LIV        Current number of Index Levels          s
575     12: POSRX      Pointer to Root Record in N0x           l
576     16: NMAXPOS    Next Available position in N0x          l
577     20: FMAXPOS    Next available position in L0x          l
578     24: ABNORMAL   Formal BTree normality indicator        s
579     length: 26 bytes
580    
581    This will fill C<$self> object under C<cnt> with hash. It's used by C<read_cnt>.
582    
583    =cut
584    
585    sub unpack_cnt {
586            my $self = shift;
587    
588            my @flds = qw(ORDN ORDF N K LIV POSRX NMAXPOS FMAXPOS ABNORMAL);
589    
590            my $buff = shift || return;
591            my @arr = unpack("vvvvvvVVVv", $buff);
592    
593            print STDERR "unpack_cnt: ",join(" ",@arr),"\n" if ($self->{'debug'});
594    
595            my $IDTYPE = shift @arr;
596            foreach (@flds) {
597                    $self->{cnt}->{$IDTYPE}->{$_} = abs(shift @arr);
598            }
599    }
600    
601  1;  1;
602    
603  =head1 BUGS  =head1 BUGS
604    
605  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
606    some variations in input databases which has been tested with this module.
607    When I was in doubt, I assumed that OpenIsis's implementation was right
608    (except for obvious bugs).
609    
610    However, every effort has been made to test this module with as much
611    databases (and programs that create them) as possible.
612    
613    I would be very greatful for success or failure reports about usage of this
614    module with databases from programs other than WinIsis and IsisMarc. I had
615    tested this against ouput of one C<isis.dll>-based application, but I don't
616    know any details about it's version.
617    
618  =head1 AUTHOR  =head1 AUTHOR
619    
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