/[Biblio-Isis]/trunk/lib/Biblio/Isis.pm
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revision 12 by dpavlin, Wed Dec 29 20:10:11 2004 UTC revision 34 by dpavlin, Thu Jan 6 00:40:07 2005 UTC
# Line 2  package IsisDB; Line 2  package IsisDB;
2  use strict;  use strict;
3    
4  use Carp;  use Carp;
5    use File::Glob qw(:globally :nocase);
6    
7  use Data::Dumper;  use Data::Dumper;
8    
9  BEGIN {  BEGIN {
10          use Exporter ();          use Exporter ();
11          use vars qw ($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);          use vars qw ($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);
12          $VERSION     = 0.04;          $VERSION     = 0.09;
13          @ISA         = qw (Exporter);          @ISA         = qw (Exporter);
14          #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
15          @EXPORT      = qw ();          @EXPORT      = qw ();
# Line 18  BEGIN { Line 20  BEGIN {
20    
21  =head1 NAME  =head1 NAME
22    
23  IsisDB - Read CDS/ISIS database  IsisDB - Read CDS/ISIS, WinISIS and IsisMarc database
24    
25  =head1 SYNOPSIS  =head1 SYNOPSIS
26    
# Line 28  IsisDB - Read CDS/ISIS database Line 30  IsisDB - Read CDS/ISIS database
30          isisdb => './cds/cds',          isisdb => './cds/cds',
31    );    );
32    
33    for(my $mfn = 1; $mfn <= $isis->{'maxmfn'}; $mfn++) {    for(my $mfn = 1; $mfn <= $isis->count; $mfn++) {
34          print $isis->to_ascii($mfn),"\n";          print $isis->to_ascii($mfn),"\n";
35    }    }
36    
37  =head1 DESCRIPTION  =head1 DESCRIPTION
38    
39  This module will read CDS/ISIS databases and create hash values out of it.  This module will read ISIS databases created by DOS CDS/ISIS, WinIsis or
40  It can be used as perl-only alternative to OpenIsis module.  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.
42  This will module will always be slower that OpenIsis module which use C  
43  library. However, since it's written in perl, it's platform independent (so  It can create hash values from data in ISIS database (using C<to_hash>),
44  you don't need C compiler), and can be easily modified.  ASCII dump (using C<to_ascii>) or just hash with field names and packed
45    values (like C<^asomething^belse>).
46    
47  Unique feature of this module is ability to C<include_deleted> records.  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  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).  fields which are zero sized will be filled with random junk from memory).
50    
51    It also has support for identifiers (only if ISIS database is created by
52    IsisMarc), see C<to_hash>.
53    
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
60    rarely an issue).
61    
62  =head1 METHODS  =head1 METHODS
63    
64  =cut  =cut
# Line 65  fields which are zero sized will be fill Line 79  fields which are zero sized will be fill
79    
80  =head2 new  =head2 new
81    
82  Open CDS/ISIS database  Open ISIS database
83    
84   my $isis = new IsisDB(   my $isis = new IsisDB(
85          isisdb => './cds/cds',          isisdb => './cds/cds',
# Line 84  Options are described below: Line 98  Options are described below:
98    
99  =item isisdb  =item isisdb
100    
101  Prefix path to CDS/ISIS. It should contain full or relative path to database  This is full or relative path to ISIS database files which include
102  and common prefix of C<.FDT>, C<.MST>, C<.CNT>, C<.XRF> and C<.MST> files.  common prefix of C<.MST>, and C<.XRF> and optionally C<.FDT> (if using
103    C<read_fdt> option) files.
104    
105    In this example it uses C<./cds/cds.MST> and related files.
106    
107  =item read_fdt  =item read_fdt
108    
# Line 106  Dump a B<lot> of debugging output. Line 123  Dump a B<lot> of debugging output.
123    
124  =back  =back
125    
 It will also set C<$isis-E<gt>{'maxmfn'}> which is maximum MFN stored in database.  
   
126  =cut  =cut
127    
128  sub new {  sub new {
# Line 121  sub new { Line 136  sub new {
136                  $self->{$v} = {@_}->{$v};                  $self->{$v} = {@_}->{$v};
137          }          }
138    
139            my @isis_files = grep(/\.(FDT|MST|XRF|CNT)$/i,glob($self->{isisdb}."*"));
140    
141            foreach my $f (@isis_files) {
142                    my $ext = $1 if ($f =~ m/\.(\w\w\w)$/);
143                    $self->{lc($ext)."_file"} = $f;
144            }
145    
146            my @must_exist = qw(mst xrf);
147            push @must_exist, "fdt" if ($self->{read_fdt});
148    
149            foreach my $ext (@must_exist) {
150                    croak "missing ",uc($ext)," file in ",$self->{isisdb} unless ($self->{$ext."_file"});
151            }
152    
153            print STDERR "## using files: ",join(" ",@isis_files),"\n" if ($self->{debug});
154    
155          # 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!
156          if ({@_}->{read_fdt} && -e $self->{isisdb}.".FDT") {          if ($self->{read_fdt} && -e $self->{fdt_file}) {
157    
158                  # read the $db.FDT file for tags                  # read the $db.FDT file for tags
159                  my $fieldzone=0;                  my $fieldzone=0;
160    
161                  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}': $!";
162                    binmode($fileFDT);
163    
164                  while (<fileFDT>) {                  while (<$fileFDT>) {
165                          chomp;                          chomp;
166                          if ($fieldzone) {                          if ($fieldzone) {
167                                  my $name=substr($_,0,30);                                  my $name=substr($_,0,30);
# Line 146  sub new { Line 178  sub new {
178                          }                          }
179                  }                  }
180                                    
181                  close(fileFDT);                  close($fileFDT);
182          }          }
183    
184          # Get the Maximum MFN from $db.MST          # Get the Maximum MFN from $db.MST
185    
186          open(fileMST,$self->{isisdb}.".MST") || croak "can't read '$self->{isisdb}.MST': $!";          open($self->{'fileMST'}, $self->{mst_file}) || croak "can't open '$self->{mst_file}': $!";
187            binmode($self->{'fileMST'});
188    
189          # MST format:   (* = 32 bit signed)          # MST format:   (* = 32 bit signed)
190          # CTLMFN*       always 0          # CTLMFN*       always 0
# Line 159  sub new { Line 192  sub new {
192          # NXTMFB*       last block allocated to master file          # NXTMFB*       last block allocated to master file
193          # NXTMFP        offset to next available position in last block          # NXTMFP        offset to next available position in last block
194          # MFTYPE        always 0 for user db file (1 for system)          # MFTYPE        always 0 for user db file (1 for system)
195          seek(fileMST,4,0);          seek($self->{'fileMST'},4,0) || croak "can't seek to offset 0 in MST: $!";
196    
197          my $buff;          my $buff;
198    
199          read(fileMST, $buff, 4);          read($self->{'fileMST'}, $buff, 4) || croak "can't read NXTMFN from MST: $!";
200          $self->{'NXTMFN'}=unpack("l",$buff) || carp "NXTNFN is zero";          $self->{'NXTMFN'}=unpack("V",$buff) || croak "NXTNFN is zero";
201    
202            print STDERR Dumper($self),"\n" if ($self->{debug});
203    
204            # open files for later
205            open($self->{'fileXRF'}, $self->{xrf_file}) || croak "can't open '$self->{xrf_file}': $!";
206            binmode($self->{'fileXRF'});
207    
208            $self ? return $self : return undef;
209    }
210    
211    =head2 count
212    
213          # save maximum MFN  Return number of records in database
         $self->{'maxmfn'} = $self->{'NXTMFN'} - 1;  
214    
215          close(fileMST);    print $isis->count;
216    
217    =cut
218    
219    sub count {
220            my $self = shift;
221            return $self->{'NXTMFN'} - 1;
222    }
223    
224    =head2 read_cnt
225    
226    Read content of C<.CNT> file and return hash containing it.
227    
228      print Dumper($isis->read_cnt);
229    
230    This function is not used by module (C<.CNT> files are not required for this
231    module to work), but it can be useful to examine your index (while debugging
232    for example).
233    
234    =cut
235    
236    sub read_cnt  {
237            my $self = shift;
238    
239            croak "missing CNT file in ",$self->{isisdb} unless ($self->{cnt_file});
240    
241          # Get the index information from $db.CNT          # Get the index information from $db.CNT
242        
243          open(fileCNT, $self->{isisdb}.".CNT") || croak "can't read '$self->{isisdb}.CNT': $!";          open(my $fileCNT, $self->{cnt_file}) || croak "can't read '$self->{cnt_file}': $!";
244            binmode($fileCNT);
         # There is two 26 Bytes fixed lenght records  
245    
246          #  0: IDTYPE    BTree type                              16          my $buff;
         #  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);  
                 }  
         }  
247    
248          read(fileCNT, $buff, 26);          read($fileCNT, $buff, 26) || croak "can't read first table from CNT: $!";
249          $self->unpack_cnt($buff);          $self->unpack_cnt($buff);
250    
251          read(fileCNT, $buff, 26);          read($fileCNT, $buff, 26) || croak "can't read second table from CNT: $!";
252          $self->unpack_cnt($buff);          $self->unpack_cnt($buff);
253    
254            close($fileCNT);
255    
256          close(fileCNT);          return $self->{cnt};
257    }
258    
259          print Dumper($self) if ($self->{debug});  =head2 unpack_cnt
260    
261          # open files for later  Unpack one of two 26 bytes fixed length record in C<.CNT> file.
         open($self->{'fileXRF'}, $self->{isisdb}.".XRF") || croak "can't open '$self->{isisdb}.XRF': $!";  
262    
263          open($self->{'fileMST'}, $self->{isisdb}.".MST") || croak "can't open '$self->{isisdb}.MST': $!";  Here is definition of record:
264    
265          $self ? return $self : return undef;   off key        description                             size
266      0: IDTYPE     BTree type                              s
267      2: ORDN       Nodes Order                             s
268      4: ORDF       Leafs Order                             s
269      6: N          Number of Memory buffers for nodes      s
270      8: K          Number of buffers for first level index s
271     10: LIV        Current number of Index Levels          s
272     12: POSRX      Pointer to Root Record in N0x           l
273     16: NMAXPOS    Next Available position in N0x          l
274     20: FMAXPOS    Next available position in L0x          l
275     24: ABNORMAL   Formal BTree normality indicator        s
276     length: 26 bytes
277    
278    This will fill C<$self> object under C<cnt> with hash. It's used by C<read_cnt>.
279    
280    =cut
281    
282    sub unpack_cnt {
283            my $self = shift;
284    
285            my @flds = qw(ORDN ORDF N K LIV POSRX NMAXPOS FMAXPOS ABNORMAL);
286    
287            my $buff = shift || return;
288            my @arr = unpack("vvvvvvVVVv", $buff);
289    
290            print STDERR "unpack_cnt: ",join(" ",@arr),"\n" if ($self->{'debug'});
291    
292            my $IDTYPE = shift @arr;
293            foreach (@flds) {
294                    $self->{cnt}->{$IDTYPE}->{$_} = abs(shift @arr);
295            }
296  }  }
297    
298  =head2 fetch  =head2 fetch
# Line 231  Read record with selected MFN Line 302  Read record with selected MFN
302    my $rec = $isis->fetch(55);    my $rec = $isis->fetch(55);
303    
304  Returns hash with keys which are field names and values are unpacked values  Returns hash with keys which are field names and values are unpacked values
305  for that field (like C<^asometing^bsomething else>)  for that field like this:
306    
307      $rec = {
308        '210' => [ '^aNew York^cNew York University press^dcop. 1988' ],
309        '990' => [ '2140', '88', 'HAY' ],
310      };
311    
312  =cut  =cut
313    
# Line 240  sub fetch { Line 316  sub fetch {
316    
317          my $mfn = shift || croak "fetch needs MFN as argument!";          my $mfn = shift || croak "fetch needs MFN as argument!";
318    
319          print "fetch: $mfn\n" if ($self->{debug});          # is mfn allready in memory?
320            my $old_mfn = $self->{'current_mfn'} || -1;
321            return $self->{record} if ($mfn == $old_mfn);
322    
323            print STDERR "## fetch: $mfn\n" if ($self->{debug});
324    
325          # XXX check this?          # XXX check this?
326          my $mfnpos=($mfn+int(($mfn-1)/127))*4;          my $mfnpos=($mfn+int(($mfn-1)/127))*4;
327    
328          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 ($self->{debug});
329          seek($self->{'fileXRF'},$mfnpos,0);          seek($self->{'fileXRF'},$mfnpos,0);
330    
331          my $buff;          my $buff;
332    
333            # delete old record
334            delete $self->{record};
335    
336          # read XRFMFB abd XRFMFP          # read XRFMFB abd XRFMFP
337          read($self->{'fileXRF'}, $buff, 4);          read($self->{'fileXRF'}, $buff, 4);
338          my $pointer=unpack("l",$buff) || carp "pointer is null";          my $pointer=unpack("V",$buff) || croak "pointer is null";
339    
340            # check for logically deleted record
341            if ($pointer & 0x80000000) {
342                    print STDERR "## record $mfn is logically deleted\n" if ($self->{debug});
343                    $self->{deleted} = $mfn;
344    
345                    return unless $self->{include_deleted};
346    
347                    # abs
348                    $pointer = ($pointer ^ 0xffffffff) + 1;
349            }
350    
351          my $XRFMFB = int($pointer/2048);          my $XRFMFB = int($pointer/2048);
352          my $XRFMFP = $pointer - ($XRFMFB*2048);          my $XRFMFP = $pointer - ($XRFMFB*2048);
353    
354          print "XRFMFB: $XRFMFB XRFMFP: $XRFMFP\n" if ($self->{debug});          # (XRFMFB - 1) * 512 + XRFMFP
355            # why do i have to do XRFMFP % 1024 ?
         # XXX fix this to be more readable!!  
         # e.g. (XRFMFB - 1) * 512 + XRFMFP  
356    
357          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)+$offset3;  
358    
359          print "$offset - $offset2 - $offset3 - $offset4\n" if ($self->{debug});          print STDERR "## pointer: $pointer XRFMFB: $XRFMFB XRFMFP: $XRFMFP offset: $blk_off\n" if ($self->{'debug'});
360    
361          # Get Record Information          # Get Record Information
362    
363          seek($self->{'fileMST'},$offset4,0);          seek($self->{'fileMST'},$blk_off,0) || croak "can't seek to $blk_off: $!";
364    
365          read($self->{'fileMST'}, $buff, 4);          read($self->{'fileMST'}, $buff, 4) || croak "can't read 4 bytes at offset $blk_off from MST file: $!";
366          my $value=unpack("l",$buff);          my $value=unpack("V",$buff);
367    
368            print STDERR "## offset for rowid $value is $blk_off (blk $XRFMFB off $XRFMFP)\n" if ($self->{debug});
369    
370          if ($value!=$mfn) {          if ($value!=$mfn) {
371  print ("Error: The MFN:".$mfn." is not found in MST(".$value.")");                      if ($value == 0) {
372                  return -1;      # XXX deleted record?                          print STDERR "## record $mfn is physically deleted\n" if ($self->{debug});
373          }                          $self->{deleted} = $mfn;
374                            return;
375                    }
376    
377  #       $MFRL=$self->Read16($fileMST);                  carp "Error: MFN ".$mfn." not found in MST file, found $value";    
378  #       $MFBWB=$self->Read32($fileMST);                  return;
379  #       $MFBWP=$self->Read16($fileMST);          }
 #       $BASE=$self->Read16($fileMST);  
 #       $NVF=$self->Read16($fileMST);  
 #       $STATUS=$self->Read16($fileMST);  
380    
381          read($self->{'fileMST'}, $buff, 14);          read($self->{'fileMST'}, $buff, 14);
382    
383          my ($MFRL,$MFBWB,$MFBWP,$BASE,$NVF,$STATUS) = unpack("slssss", $buff);          my ($MFRL,$MFBWB,$MFBWP,$BASE,$NVF,$STATUS) = unpack("vVvvvv", $buff);
384    
385          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});
386    
387          # delete old record          warn "MFRL $MFRL is not even number" unless ($MFRL % 2 == 0);
         delete $self->{record};  
388    
389          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;  
         }  
390    
391          # Get Directory Format          # Get Directory Format
392    
# Line 314  print ("Error: The MFN:".$mfn." is not f Line 396  print ("Error: The MFN:".$mfn." is not f
396    
397          read($self->{'fileMST'}, $buff, 6 * $NVF);          read($self->{'fileMST'}, $buff, 6 * $NVF);
398    
399          my $fld_len = 0;          my $rec_len = 0;
400    
401          for (my $i = 0 ; $i < $NVF ; $i++) {          for (my $i = 0 ; $i < $NVF ; $i++) {
402    
403  #               $TAG=$self->Read16($fileMST);                  my ($TAG,$POS,$LEN) = unpack("vvv", substr($buff,$i * 6, 6));
 #               $POS=$self->Read16($fileMST);  
 #               $LEN=$self->Read16($fileMST);  
404    
405                  my ($TAG,$POS,$LEN) = unpack("sss", substr($buff,$i * 6, 6));                  print STDERR "## TAG: $TAG POS: $POS LEN: $LEN\n" if ($self->{debug});
   
                 print "TAG: $TAG POS: $POS LEN: $LEN\n" if ($self->{debug});  
406    
407                  # 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.
408                  #                  #
# Line 340  print ("Error: The MFN:".$mfn." is not f Line 418  print ("Error: The MFN:".$mfn." is not f
418                  push @FieldPOS,$POS;                  push @FieldPOS,$POS;
419                  push @FieldLEN,$LEN;                  push @FieldLEN,$LEN;
420    
421                  $fld_len += $LEN;                  $rec_len += $LEN;
422          }          }
423    
424          # Get Variable Fields          # Get Variable Fields
425    
426          read($self->{'fileMST'},$buff,$fld_len);          read($self->{'fileMST'},$buff,$rec_len);
427    
428            print STDERR "## rec_len: $rec_len poc: ",tell($self->{'fileMST'})."\n" if ($self->{debug});
429    
430          for (my $i = 0 ; $i < $NVF ; $i++) {          for (my $i = 0 ; $i < $NVF ; $i++) {
431                  # skip zero-sized fields                  # skip zero-sized fields
# Line 353  print ("Error: The MFN:".$mfn." is not f Line 433  print ("Error: The MFN:".$mfn." is not f
433    
434                  push @{$self->{record}->{$FieldTAG[$i]}}, substr($buff,$FieldPOS[$i],$FieldLEN[$i]);                  push @{$self->{record}->{$FieldTAG[$i]}}, substr($buff,$FieldPOS[$i],$FieldLEN[$i]);
435          }          }
         close(fileMST);  
436    
437          print Dumper($self) if ($self->{debug});          $self->{'current_mfn'} = $mfn;
438    
439            print STDERR Dumper($self),"\n" if ($self->{debug});
440    
441          return $self->{'record'};          return $self->{'record'};
442  }  }
443    
444  =head2 to_ascii  =head2 to_ascii
445    
446  Dump ascii output of selected MFN  Returns ASCII output of record with specified MFN
447    
448      print $isis->to_ascii(42);
449    
450    This outputs something like this:
451    
452      210   ^aNew York^cNew York University press^dcop. 1988
453      990   2140
454      990   88
455      990   HAY
456    
457    print $isis->to_ascii(55);  If C<read_fdt> is specified when calling C<new> it will display field names
458    from C<.FDT> file instead of numeric tags.
459    
460  =cut  =cut
461    
# Line 378  sub to_ascii { Line 469  sub to_ascii {
469          my $out = "0\t$mfn";          my $out = "0\t$mfn";
470    
471          foreach my $f (sort keys %{$rec}) {          foreach my $f (sort keys %{$rec}) {
472                  $out .= "\n$f\t".join("\n$f\t",@{$self->{record}->{$f}});                  my $fn = $self->tag_name($f);
473                    $out .= "\n$fn\t".join("\n$fn\t",@{$self->{record}->{$f}});
474          }          }
475    
476          $out .= "\n";          $out .= "\n";
# Line 388  sub to_ascii { Line 480  sub to_ascii {
480    
481  =head2 to_hash  =head2 to_hash
482    
483  Read mfn and convert it to hash  Read record with specified MFN and convert it to hash
484    
485    my $hash = $isis->to_hash($mfn);    my $hash = $isis->to_hash($mfn);
486    
487  It has ability to convert characters (using C<hash_filter> from ISIS  It has ability to convert characters (using C<hash_filter>) from ISIS
488  database before creating structures enabling character remapping or quick  database before creating structures enabling character re-mapping or quick
489  fixup of data.  fix-up of data.
490    
491  This function returns hash which is like this:  This function returns hash which is like this:
492    
# Line 413  This function returns hash which is like Line 505  This function returns hash which is like
505               ],               ],
506    };    };
507    
508  You can later use that has to produce any output from ISIS data.  You can later use that hash to produce any output from ISIS data.
509    
510    If database is created using IsisMarc, it will also have to special fields
511    which will be used for identifiers, C<i1> and C<i2> like this:
512    
513      '200' => [
514                 {
515                   'i1' => '1',
516                   'i2' => ' '
517                   'a' => 'Goa',
518                   'f' => 'Valdo D\'Arienzo',
519                   'e' => 'tipografie e tipografi nel XVI secolo',
520                 }
521               ],
522    
523    This method will also create additional field C<000> with MFN.
524    
525  =cut  =cut
526    
# Line 422  sub to_hash { Line 529  sub to_hash {
529    
530          my $mfn = shift || confess "need mfn!";          my $mfn = shift || confess "need mfn!";
531    
532          my $rec;          # init record to include MFN as field 000
533            my $rec = { '000' => [ $mfn ] };
534    
535          my $row = $self->fetch($mfn);          my $row = $self->fetch($mfn);
536    
537          foreach my $k (keys %{$row}) {          foreach my $k (keys %{$row}) {
# Line 431  sub to_hash { Line 540  sub to_hash {
540                          # filter output                          # filter output
541                          $l = $self->{'hash_filter'}->($l) if ($self->{'hash_filter'});                          $l = $self->{'hash_filter'}->($l) if ($self->{'hash_filter'});
542    
                         # has subfields?  
543                          my $val;                          my $val;
544    
545                            # has identifiers?
546                            ($val->{'i1'},$val->{'i2'}) = ($1,$2) if ($l =~ s/^([01 #])([01 #])\^/\^/);
547    
548                            # has subfields?
549                          if ($l =~ m/\^/) {                          if ($l =~ m/\^/) {
550                                  foreach my $t (split(/\^/,$l)) {                                  foreach my $t (split(/\^/,$l)) {
551                                          next if (! $t);                                          next if (! $t);
# Line 449  sub to_hash { Line 562  sub to_hash {
562          return $rec;          return $rec;
563  }  }
564    
565  #  =head2 tag_name
 # XXX porting from php left-over:  
 #  
 # do I *REALLY* need those methods, or should I use  
 # $self->{something} directly?  
 #  
 # Probably direct usage is better!  
 #  
566    
567  sub TagName {  Return name of selected tag
568          my $self = shift;  
569          return $self->{TagName};   print $isis->tag_name('200');
 }  
570    
571  sub NextMFN {  =cut
572    
573    sub tag_name {
574          my $self = shift;          my $self = shift;
575          return $self->{NXTMFN};          my $tag = shift || return;
576            return $self->{'TagName'}->{$tag} || $tag;
577  }  }
578    
579  1;  1;
580    
581  =head1 BUGS  =head1 BUGS
582    
583  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
584    some variations in input databases which has been tested with this module.
585    When I was in doubt, I assumed that OpenIsis's implementation was right
586    (except for obvious bugs).
587    
588    However, every effort has been made to test this module with as much
589    databases (and programs that create them) as possible.
590    
591    I would be very greatful for success or failure reports about usage of this
592    module with databases from programs other than WinIsis and IsisMarc. I had
593    tested this against ouput of one C<isis.dll>-based application, but I don't
594    know any details about it's version.
595    
596  =head1 AUTHOR  =head1 AUTHOR
597    
# Line 481  This module has been very lightly tested Line 600  This module has been very lightly tested
600          dpavlin@rot13.org          dpavlin@rot13.org
601          http://www.rot13.org/~dpavlin/          http://www.rot13.org/~dpavlin/
602    
603  This module is based heavily on code from LIBISIS.PHP - Library to read ISIS files V0.1.1  This module is based heavily on code from C<LIBISIS.PHP> library to read ISIS files V0.1.1
604  written in php and (c) 2000 Franck Martin - <franck@sopac.org> released under LGPL.  written in php and (c) 2000 Franck Martin <franck@sopac.org> and released under LGPL.
605    
606  =head1 COPYRIGHT  =head1 COPYRIGHT
607    
# Line 495  LICENSE file included with this module. Line 614  LICENSE file included with this module.
614    
615  =head1 SEE ALSO  =head1 SEE ALSO
616    
617  L<http://www.openisis.org|OpenIsis>, perl(1).  OpenIsis web site L<http://www.openisis.org>
618    
619    perl4lib site L<http://perl4lib.perl.org>
620    
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