--- trunk/IsisDB.pm 2004/12/29 15:17:59 8 +++ trunk/IsisDB.pm 2004/12/30 17:16:34 16 @@ -7,7 +7,7 @@ BEGIN { use Exporter (); use vars qw ($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS); - $VERSION = 0.02; + $VERSION = 0.06; @ISA = qw (Exporter); #Give a hoot don't pollute, do not export more than needed by default @EXPORT = qw (); @@ -18,19 +18,43 @@ =head1 NAME -IsisDB - Read CDS/ISIS database +IsisDB - Read CDS/ISIS, WinISIS and IsisMarc database =head1 SYNOPSIS - use IsisDB + use IsisDB; + my $isis = new IsisDB( isisdb => './cds/cds', ); + for(my $mfn = 1; $mfn <= $isis->{'maxmfn'}; $mfn++) { + print $isis->to_ascii($mfn),"\n"; + } + =head1 DESCRIPTION -This module will read CDS/ISIS databases and create hash values out of it. -It can be used as perl-only alternative to OpenIsis module. +This module will read ISIS databases created by DOS CDS/ISIS, WinIsis or +IsisMarc. It can be used as perl-only alternative to OpenIsis module. + +It can create hash values from data in ISIS database (using C), +ASCII dump (using C) or just hash with field names and packed +values (like C<^asomething^belse>). + +Unique feature of this module is ability to C records. +It will also skip zero sized fields (OpenIsis has a bug in XS bindings, so +fields which are zero sized will be filled with random junk from memory). + +It also has support for identifiers (only if ISIS database is created by +IsisMarc), see C. + +This will module will always be slower than OpenIsis module which use C +library. However, since it's written in perl, it's platform independent (so +you don't need C compiler), and can be easily modified. I hope that it +creates data structures which are easier to use than ones created by +OpenIsis, so reduced time in other parts of the code should compensate for +slower performance of this module (speed of reading ISIS database is +rarely an issue). =head1 METHODS @@ -50,21 +74,18 @@ # some binary reads # -sub Read32 { - my $self = shift; - - my $f = shift || die "Read32 needs file handle"; - read($$f,$b,4) || die "can't read 4 bytes from $$f from position ".tell($f); - return unpack("l",$b); -} - =head2 new -Open CDS/ISIS database +Open ISIS database my $isis = new IsisDB( isisdb => './cds/cds', read_fdt => 1, + include_deleted => 1, + hash_filter => sub { + my $v = shift; + $v =~ s#foo#bar#g; + }, debug => 1, ); @@ -74,17 +95,27 @@ =item isisdb -Prefix path to CDS/ISIS. It should contain full or relative path to database -and common prefix of C<.FDT>, C<.MST>, C<.CNT>, C<.XRF> and C<.MST> files. +This is full or relative path to ISIS database files which include +common prefix of C<.FDT>, C<.MST>, C<.CNT>, C<.XRF> and C<.MST> files. + +In this example it uses C<./cds/cds.MST> and related files. =item read_fdt Boolean flag to specify if field definition table should be read. It's off by default. +=item include_deleted + +Don't skip logically deleted records in ISIS. + +=item hash_filter + +Filter code ref which will be used before data is converted to hash. + =item debug -Dump a C of debugging output. +Dump a B of debugging output. =back @@ -97,9 +128,11 @@ my $self = {}; bless($self, $class); - $self->{isisdb} = {@_}->{isisdb} || croak "new needs database name as argument!"; + croak "new needs database name (isisdb) as argument!" unless ({@_}->{isisdb}); - $self->{debug} = {@_}->{debug}; + foreach my $v (qw{isisdb debug include_deleted hash_filter}) { + $self->{$v} = {@_}->{$v}; + } # if you want to read .FDT file use read_fdt argument when creating class! if ({@_}->{read_fdt} && -e $self->{isisdb}.".FDT") { @@ -140,7 +173,11 @@ # NXTMFP offset to next available position in last block # MFTYPE always 0 for user db file (1 for system) seek(fileMST,4,0); - $self->{'NXTMFN'}=$self->Read32(\*fileMST) || carp "NXTNFN is zero"; + + my $buff; + + read(fileMST, $buff, 4); + $self->{'NXTMFN'}=unpack("l",$buff) || carp "NXTNFN is zero"; # save maximum MFN $self->{'maxmfn'} = $self->{'NXTMFN'} - 1; @@ -173,13 +210,14 @@ 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) { $self->{$IDTYPE}->{$_} = abs(shift @arr); } } - my $buff; read(fileCNT, $buff, 26); $self->unpack_cnt($buff); @@ -189,7 +227,7 @@ close(fileCNT); - print Dumper($self) if ($self->{debug}); + print STDERR Dumper($self),"\n" if ($self->{debug}); # open files for later open($self->{'fileXRF'}, $self->{isisdb}.".XRF") || croak "can't open '$self->{isisdb}.XRF': $!"; @@ -206,7 +244,12 @@ my $rec = $isis->fetch(55); Returns hash with keys which are field names and values are unpacked values -for that field. +for that field like this: + + $rec = { + '210' => [ '^aNew York^cNew York University press^dcop. 1988' ], + '990' => [ '2140', '88', 'HAY' ], + }; =cut @@ -215,45 +258,47 @@ my $mfn = shift || croak "fetch needs MFN as argument!"; - print "fetch: $mfn\n" if ($self->{debug}); + # is mfn allready in memory? + my $old_mfn = $self->{'current_mfn'} || -1; + return if ($mfn == $old_mfn); + + print STDERR "## fetch: $mfn\n" if ($self->{debug}); # XXX check this? my $mfnpos=($mfn+int(($mfn-1)/127))*4; - print "seeking to $mfnpos in file '$self->{isisdb}.XRF'\n" if ($self->{debug}); + print STDERR "## seeking to $mfnpos in file '$self->{isisdb}.XRF'\n" if ($self->{debug}); seek($self->{'fileXRF'},$mfnpos,0); + my $buff; + # read XRFMFB abd XRFMFP - my $pointer=$self->Read32(\*{$self->{'fileXRF'}}); + read($self->{'fileXRF'}, $buff, 4); + my $pointer=unpack("l",$buff) || carp "pointer is null"; my $XRFMFB = int($pointer/2048); my $XRFMFP = $pointer - ($XRFMFB*2048); - print "XRFMFB: $XRFMFB XRFMFP: $XRFMFP\n" if ($self->{debug}); - # XXX fix this to be more readable!! - # e.g. (XRFMFB - 1) * 512 + XRFMFP + # (XRFMFB - 1) * 512 + XRFMFP + # why do i have to do XRFMFP % 1024 ? - my $offset = $pointer; - 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; + my $blk_off = (($XRFMFB - 1) * 512) + ($XRFMFP % 1024); - print "$offset - $offset2 - $offset3 - $offset4\n" if ($self->{debug}); + print STDERR "## pointer: $pointer XRFMFB: $XRFMFB XRFMFP: $XRFMFP offset: $blk_off\n" if ($self->{'debug'}); # Get Record Information - seek($self->{'fileMST'},$offset4,0); + seek($self->{'fileMST'},$blk_off,0); - my $value=$self->Read32(\*{$self->{'fileMST'}}); + read($self->{'fileMST'}, $buff, 4); + my $value=unpack("l",$buff); + + print STDERR "## offset for rowid $value is $blk_off (blk $XRFMFB off $XRFMFP)\n" if ($self->{debug}); if ($value!=$mfn) { -print ("Error: The MFN:".$mfn." is not found in MST(".$value.")"); - return -1; # XXX deleted record? + carp "Error: MFN ".$mfn." not found in MST(".$value.")"; + #return; # XXX deleted record? } # $MFRL=$self->Read16($fileMST); @@ -263,12 +308,22 @@ # $NVF=$self->Read16($fileMST); # $STATUS=$self->Read16($fileMST); - my $buff; read($self->{'fileMST'}, $buff, 14); my ($MFRL,$MFBWB,$MFBWP,$BASE,$NVF,$STATUS) = unpack("slssss", $buff); - 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}); + + # delete old record + 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; + } + + warn "BASE is not 18+6*NVF" unless ($BASE == 18 + 6 * $NVF); # Get Directory Format @@ -278,7 +333,7 @@ read($self->{'fileMST'}, $buff, 6 * $NVF); - my $fld_len = 0; + my $rec_len = 0; for (my $i = 0 ; $i < $NVF ; $i++) { @@ -288,7 +343,7 @@ my ($TAG,$POS,$LEN) = unpack("sss", substr($buff,$i * 6, 6)); - print "TAG: $TAG POS: $POS LEN: $LEN\n" if ($self->{debug}); + print STDERR "## TAG: $TAG POS: $POS LEN: $LEN\n" if ($self->{debug}); # The TAG does not exists in .FDT so we set it to 0. # @@ -304,35 +359,45 @@ push @FieldPOS,$POS; push @FieldLEN,$LEN; - $fld_len += $LEN; + $rec_len += $LEN; } # Get Variable Fields - delete $self->{record}; + read($self->{'fileMST'},$buff,$rec_len); - read($self->{'fileMST'},$buff,$fld_len); + print STDERR "## rec_len: $rec_len poc: ",tell($self->{'fileMST'})."\n" if ($self->{debug}); for (my $i = 0 ; $i < $NVF ; $i++) { + # skip zero-sized fields + next if ($FieldLEN[$i] == 0); + push @{$self->{record}->{$FieldTAG[$i]}}, substr($buff,$FieldPOS[$i],$FieldLEN[$i]); } close(fileMST); - # The record is marked for deletion - if ($STATUS==1) { - return -1; - } + $self->{'current_mfn'} = $mfn; - print Dumper($self) if ($self->{debug}); + print Dumper($self),"\n" if ($self->{debug}); return $self->{'record'}; } =head2 to_ascii -Dump ascii output of selected MFN +Dump ASCII output of record with specified MFN - print $isis->to_ascii(55); + print $isis->to_ascii(42); + +It outputs something like this: + + 210 ^aNew York^cNew York University press^dcop. 1988 + 990 2140 + 990 88 + 990 HAY + +If C is specified when calling C it will display field names +from C<.FDT> file instead of numeric tags. =cut @@ -346,7 +411,8 @@ my $out = "0\t$mfn"; foreach my $f (sort keys %{$rec}) { - $out .= "\n$f\t".join("\n$f\t",@{$self->{record}->{$f}}); + my $fn = $self->tag_name($f); + $out .= "\n$fn\t".join("\n$fn\t",@{$self->{record}->{$f}}); } $out .= "\n"; @@ -354,23 +420,102 @@ return $out; } -# -# XXX porting from php left-over: -# -# do I *REALLY* need those methods, or should I use -# $self->{something} directly? -# -# Probably direct usage is better! -# +=head2 to_hash + +Read record with specified MFN and convert it to hash -sub TagName { + my $hash = $isis->to_hash($mfn); + +It has ability to convert characters (using C from ISIS +database before creating structures enabling character re-mapping or quick +fix-up of data. + +This function returns hash which is like this: + + $hash = { + '210' => [ + { + 'c' => 'New York University press', + 'a' => 'New York', + 'd' => 'cop. 1988' + } + ], + '990' => [ + '2140', + '88', + 'HAY' + ], + }; + +You can later use that hash to produce any output from ISIS data. + +If database is created using IsisMarc, it will also have to special fields +which will be used for identifiers, C and C like this: + + '200' => [ + { + 'i1' => '1', + 'i2' => ' ' + 'a' => 'Goa', + 'f' => 'Valdo D\'Arienzo', + 'e' => 'tipografie e tipografi nel XVI secolo', + } + ], + +This method will also create additional field C<000> with MFN. + +=cut + +sub to_hash { my $self = shift; - return $self->{TagName}; + + my $mfn = shift || confess "need mfn!"; + + # init record to include MFN as field 000 + my $rec = { '000' => [ $mfn ] }; + + my $row = $self->fetch($mfn); + + foreach my $k (keys %{$row}) { + foreach my $l (@{$row->{$k}}) { + + # filter output + $l = $self->{'hash_filter'}->($l) if ($self->{'hash_filter'}); + + my $val; + + # has identifiers? + ($val->{'i1'},$val->{'i2'}) = ($1,$2) if ($l =~ s/^([01 #])([01 #])//); + + # has subfields? + if ($l =~ m/\^/) { + foreach my $t (split(/\^/,$l)) { + next if (! $t); + $val->{substr($t,0,1)} = substr($t,1); + } + } else { + $val = $l; + } + + push @{$rec->{$k}}, $val; + } + } + + return $rec; } -sub NextMFN { +=head2 tag_name + +Return name of selected tag + + print $isis->tag_name('200'); + +=cut + +sub tag_name { my $self = shift; - return $self->{NXTMFN}; + my $tag = shift || return; + return $self->{'TagName'}->{$tag} || $tag; } 1; @@ -386,8 +531,8 @@ dpavlin@rot13.org http://www.rot13.org/~dpavlin/ -This module is based heavily on code from LIBISIS.PHP - Library to read ISIS files V0.1.1 -written in php and (c) 2000 Franck Martin - released under LGPL. +This module is based heavily on code from C library to read ISIS files V0.1.1 +written in php and (c) 2000 Franck Martin and released under LGPL. =head1 COPYRIGHT @@ -400,5 +545,7 @@ =head1 SEE ALSO -L, perl(1). +OpenIsis web site L + +perl4lib site L