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dpavlin |
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package IsisDB; |
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use strict; |
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use Carp; |
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use Data::Dumper; |
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BEGIN { |
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use Exporter (); |
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use vars qw ($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS); |
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$VERSION = 0.05; |
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@ISA = qw (Exporter); |
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#Give a hoot don't pollute, do not export more than needed by default |
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@EXPORT = qw (); |
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@EXPORT_OK = qw (); |
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%EXPORT_TAGS = (); |
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} |
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=head1 NAME |
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IsisDB - Read CDS/ISIS, WinISIS and IsisMarc database |
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=head1 SYNOPSIS |
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use IsisDB; |
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my $isis = new IsisDB( |
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isisdb => './cds/cds', |
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); |
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for(my $mfn = 1; $mfn <= $isis->{'maxmfn'}; $mfn++) { |
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print $isis->to_ascii($mfn),"\n"; |
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} |
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=head1 DESCRIPTION |
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This module will read ISIS databases created by DOS CDS/ISIS, WinIsis or |
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IsisMarc. It can be used as perl-only alternative to OpenIsis module. |
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It can create hash values from data in ISIS database (using C<to_hash>), |
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ASCII dump (using C<to_ascii>) or just hash with field names and packed |
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values (like C<^asomething^belse>). |
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Unique feature of this module is ability to C<include_deleted> records. |
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It will also skip zero sized fields (OpenIsis has a bug in XS bindings, so |
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fields which are zero sized will be filled with random junk from memory). |
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It also has support for identifiers (only if ISIS database is created by |
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IsisMarc), see C<to_hash>. |
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This will module will always be slower than OpenIsis module which use C |
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library. However, since it's written in perl, it's platform independent (so |
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you don't need C compiler), and can be easily modified. I hope that it |
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creates data structures which are easier to use than ones created by |
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OpenIsis, so reduced time in other parts of the code should compensate for |
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slower performance of this module (speed of reading ISIS database is |
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rarely an issue). |
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=head1 METHODS |
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=cut |
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# my $ORDN; # Nodes Order |
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# my $ORDF; # Leafs Order |
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# my $N; # Number of Memory buffers for nodes |
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# my $K; # Number of buffers for first level index |
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# my $LIV; # Current number of Index Levels |
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# my $POSRX; # Pointer to Root Record in N0x |
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# my $NMAXPOS; # Next Available position in N0x |
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# my $FMAXPOS; # Next available position in L0x |
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# my $ABNORMAL; # Formal BTree normality indicator |
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# |
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# some binary reads |
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# |
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=head2 new |
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Open ISIS database |
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my $isis = new IsisDB( |
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isisdb => './cds/cds', |
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read_fdt => 1, |
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include_deleted => 1, |
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hash_filter => sub { |
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my $v = shift; |
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$v =~ s#foo#bar#g; |
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}, |
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debug => 1, |
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); |
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Options are described below: |
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=over 5 |
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=item isisdb |
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This is full or relative path to ISIS database files which include |
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common prefix of C<.FDT>, C<.MST>, C<.CNT>, C<.XRF> and C<.MST> files. |
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In this example it uses C<./cds/cds.MST> and related files. |
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=item read_fdt |
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Boolean flag to specify if field definition table should be read. It's off |
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by default. |
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=item include_deleted |
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Don't skip logically deleted records in ISIS. |
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=item hash_filter |
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Filter code ref which will be used before data is converted to hash. |
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=item debug |
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Dump a B<lot> of debugging output. |
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=back |
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It will also set C<$isis-E<gt>{'maxmfn'}> which is maximum MFN stored in database. |
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=cut |
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sub new { |
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my $class = shift; |
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my $self = {}; |
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bless($self, $class); |
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croak "new needs database name (isisdb) as argument!" unless ({@_}->{isisdb}); |
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foreach my $v (qw{isisdb debug include_deleted hash_filter}) { |
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$self->{$v} = {@_}->{$v}; |
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} |
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# if you want to read .FDT file use read_fdt argument when creating class! |
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if ({@_}->{read_fdt} && -e $self->{isisdb}.".FDT") { |
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# read the $db.FDT file for tags |
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my $fieldzone=0; |
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open(fileFDT, $self->{isisdb}.".FDT") || croak "can't read '$self->{isisdb}.FDT': $!"; |
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while (<fileFDT>) { |
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chomp; |
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if ($fieldzone) { |
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my $name=substr($_,0,30); |
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my $tag=substr($_,50,3); |
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$name =~ s/\s+$//; |
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$tag =~ s/\s+$//; |
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$self->{'TagName'}->{$tag}=$name; |
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} |
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if (/^\*\*\*/) { |
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$fieldzone=1; |
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} |
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} |
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close(fileFDT); |
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} |
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# Get the Maximum MFN from $db.MST |
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open(fileMST,$self->{isisdb}.".MST") || croak "can't read '$self->{isisdb}.MST': $!"; |
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# MST format: (* = 32 bit signed) |
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# CTLMFN* always 0 |
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# NXTMFN* MFN to be assigned to the next record created |
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# NXTMFB* last block allocated to master file |
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# NXTMFP offset to next available position in last block |
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# MFTYPE always 0 for user db file (1 for system) |
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seek(fileMST,4,0); |
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my $buff; |
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read(fileMST, $buff, 4); |
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$self->{'NXTMFN'}=unpack("l",$buff) || carp "NXTNFN is zero"; |
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# save maximum MFN |
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$self->{'maxmfn'} = $self->{'NXTMFN'} - 1; |
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close(fileMST); |
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# Get the index information from $db.CNT |
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open(fileCNT, $self->{isisdb}.".CNT") || croak "can't read '$self->{isisdb}.CNT': $!"; |
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# There is two 26 Bytes fixed lenght records |
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# 0: IDTYPE BTree type 16 |
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# 2: ORDN Nodes Order 16 |
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# 4: ORDF Leafs Order 16 |
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# 6: N Number of Memory buffers for nodes 16 |
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# 8: K Number of buffers for first level index 16 |
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# 10: LIV Current number of Index Levels 16 |
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# 12: POSRX* Pointer to Root Record in N0x 32 |
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# 16: NMAXPOS* Next Available position in N0x 32 |
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# 20: FMAXPOS* Next available position in L0x 32 |
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# 24: ABNORMAL Formal BTree normality indicator 16 |
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# length: 26 bytes |
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sub unpack_cnt { |
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my $self = shift; |
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my @flds = qw(ORDN ORDF N K LIV POSRX NMAXPOS FMAXPOS ABNORMAL); |
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my $buff = shift || return; |
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my @arr = unpack("ssssssllls", $buff); |
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print "unpack_cnt: ",join(" ",@arr),"\n" if ($self->{'debug'}); |
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my $IDTYPE = shift @arr; |
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foreach (@flds) { |
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$self->{$IDTYPE}->{$_} = abs(shift @arr); |
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} |
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} |
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read(fileCNT, $buff, 26); |
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$self->unpack_cnt($buff); |
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read(fileCNT, $buff, 26); |
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$self->unpack_cnt($buff); |
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close(fileCNT); |
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print Dumper($self),"\n" if ($self->{debug}); |
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# open files for later |
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open($self->{'fileXRF'}, $self->{isisdb}.".XRF") || croak "can't open '$self->{isisdb}.XRF': $!"; |
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open($self->{'fileMST'}, $self->{isisdb}.".MST") || croak "can't open '$self->{isisdb}.MST': $!"; |
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$self ? return $self : return undef; |
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} |
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=head2 fetch |
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Read record with selected MFN |
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my $rec = $isis->fetch(55); |
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Returns hash with keys which are field names and values are unpacked values |
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for that field like this: |
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$rec = { |
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'210' => [ '^aNew York^cNew York University press^dcop. 1988' ], |
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'990' => [ '2140', '88', 'HAY' ], |
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}; |
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=cut |
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sub fetch { |
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my $self = shift; |
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my $mfn = shift || croak "fetch needs MFN as argument!"; |
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print "fetch: $mfn\n" if ($self->{debug}); |
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# XXX check this? |
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my $mfnpos=($mfn+int(($mfn-1)/127))*4; |
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print "seeking to $mfnpos in file '$self->{isisdb}.XRF'\n" if ($self->{debug}); |
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seek($self->{'fileXRF'},$mfnpos,0); |
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my $buff; |
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# read XRFMFB abd XRFMFP |
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read($self->{'fileXRF'}, $buff, 4); |
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my $pointer=unpack("l",$buff) || carp "pointer is null"; |
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my $XRFMFB = int($pointer/2048); |
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my $XRFMFP = $pointer - ($XRFMFB*2048); |
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print "XRFMFB: $XRFMFB XRFMFP: $XRFMFP\n" if ($self->{debug}); |
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# XXX fix this to be more readable!! |
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# e.g. (XRFMFB - 1) * 512 + XRFMFP |
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my $offset = $pointer; |
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my $offset2=int($offset/2048)-1; |
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my $offset22=int($offset/4096); |
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my $offset3=$offset-($offset22*4096); |
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if ($offset3>512) { |
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$offset3=$offset3-2048; |
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} |
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my $offset4=($offset2*512)+$offset3; |
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print "$offset - $offset2 - $offset3 - $offset4\n" if ($self->{debug}); |
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# Get Record Information |
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seek($self->{'fileMST'},$offset4,0); |
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read($self->{'fileMST'}, $buff, 4); |
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my $value=unpack("l",$buff); |
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if ($value!=$mfn) { |
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print ("Error: The MFN:".$mfn." is not found in MST(".$value.")"); |
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return -1; # XXX deleted record? |
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} |
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# $MFRL=$self->Read16($fileMST); |
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# $MFBWB=$self->Read32($fileMST); |
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# $MFBWP=$self->Read16($fileMST); |
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# $BASE=$self->Read16($fileMST); |
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# $NVF=$self->Read16($fileMST); |
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# $STATUS=$self->Read16($fileMST); |
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dpavlin |
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read($self->{'fileMST'}, $buff, 14); |
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dpavlin |
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my ($MFRL,$MFBWB,$MFBWP,$BASE,$NVF,$STATUS) = unpack("slssss", $buff); |
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print "MFRL: $MFRL MFBWB: $MFBWB MFBWP: $MFBWP BASE: $BASE NVF: $NVF STATUS: $STATUS\n" if ($self->{debug}); |
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dpavlin |
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# delete old record |
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delete $self->{record}; |
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if (! $self->{'include_deleted'} && $MFRL < 0) { |
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print "## logically deleted record $mfn, skipping...\n" if ($self->{debug}); |
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return; |
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} |
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dpavlin |
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# Get Directory Format |
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my @FieldPOS; |
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my @FieldLEN; |
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my @FieldTAG; |
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dpavlin |
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read($self->{'fileMST'}, $buff, 6 * $NVF); |
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my $fld_len = 0; |
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dpavlin |
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for (my $i = 0 ; $i < $NVF ; $i++) { |
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# $TAG=$self->Read16($fileMST); |
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# $POS=$self->Read16($fileMST); |
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# $LEN=$self->Read16($fileMST); |
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dpavlin |
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my ($TAG,$POS,$LEN) = unpack("sss", substr($buff,$i * 6, 6)); |
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dpavlin |
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print "TAG: $TAG POS: $POS LEN: $LEN\n" if ($self->{debug}); |
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# The TAG does not exists in .FDT so we set it to 0. |
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# |
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# XXX This is removed from perl version; .FDT file is updated manually, so |
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# you will often have fields in .MST file which aren't in .FDT. On the other |
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# hand, IsisMarc doesn't use .FDT files at all! |
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#if (! $self->{TagName}->{$TAG}) { |
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# $TAG=0; |
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#} |
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push @FieldTAG,$TAG; |
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push @FieldPOS,$POS; |
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push @FieldLEN,$LEN; |
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dpavlin |
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$fld_len += $LEN; |
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dpavlin |
1 |
} |
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# Get Variable Fields |
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dpavlin |
8 |
read($self->{'fileMST'},$buff,$fld_len); |
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368 |
dpavlin |
1 |
for (my $i = 0 ; $i < $NVF ; $i++) { |
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dpavlin |
10 |
# skip zero-sized fields |
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next if ($FieldLEN[$i] == 0); |
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dpavlin |
8 |
push @{$self->{record}->{$FieldTAG[$i]}}, substr($buff,$FieldPOS[$i],$FieldLEN[$i]); |
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dpavlin |
1 |
} |
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close(fileMST); |
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|
376 |
dpavlin |
15 |
print Dumper($self),"\n" if ($self->{debug}); |
377 |
dpavlin |
1 |
|
378 |
dpavlin |
2 |
return $self->{'record'}; |
379 |
dpavlin |
1 |
} |
380 |
|
|
|
381 |
dpavlin |
2 |
=head2 to_ascii |
382 |
|
|
|
383 |
dpavlin |
15 |
Dump ASCII output of record with specified MFN |
384 |
dpavlin |
2 |
|
385 |
dpavlin |
15 |
print $isis->to_ascii(42); |
386 |
dpavlin |
2 |
|
387 |
dpavlin |
15 |
It outputs something like this: |
388 |
|
|
|
389 |
|
|
210 ^aNew York^cNew York University press^dcop. 1988 |
390 |
|
|
990 2140 |
391 |
|
|
990 88 |
392 |
|
|
990 HAY |
393 |
|
|
|
394 |
|
|
If C<read_fdt> is specified when calling C<new> it will display field names |
395 |
|
|
from C<.FDT> file instead of numeric tags. |
396 |
|
|
|
397 |
dpavlin |
2 |
=cut |
398 |
|
|
|
399 |
|
|
sub to_ascii { |
400 |
|
|
my $self = shift; |
401 |
|
|
|
402 |
|
|
my $mfn = shift || croak "need MFN"; |
403 |
|
|
|
404 |
dpavlin |
7 |
my $rec = $self->fetch($mfn); |
405 |
dpavlin |
2 |
|
406 |
|
|
my $out = "0\t$mfn"; |
407 |
|
|
|
408 |
|
|
foreach my $f (sort keys %{$rec}) { |
409 |
dpavlin |
15 |
my $fn = $self->tag_name($f); |
410 |
|
|
$out .= "\n$fn\t".join("\n$fn\t",@{$self->{record}->{$f}}); |
411 |
dpavlin |
2 |
} |
412 |
|
|
|
413 |
|
|
$out .= "\n"; |
414 |
|
|
|
415 |
|
|
return $out; |
416 |
|
|
} |
417 |
|
|
|
418 |
dpavlin |
12 |
=head2 to_hash |
419 |
|
|
|
420 |
dpavlin |
15 |
Read record with specified MFN and convert it to hash |
421 |
dpavlin |
12 |
|
422 |
|
|
my $hash = $isis->to_hash($mfn); |
423 |
|
|
|
424 |
|
|
It has ability to convert characters (using C<hash_filter> from ISIS |
425 |
dpavlin |
15 |
database before creating structures enabling character re-mapping or quick |
426 |
|
|
fix-up of data. |
427 |
dpavlin |
12 |
|
428 |
|
|
This function returns hash which is like this: |
429 |
|
|
|
430 |
|
|
$hash = { |
431 |
|
|
'210' => [ |
432 |
|
|
{ |
433 |
|
|
'c' => 'New York University press', |
434 |
|
|
'a' => 'New York', |
435 |
|
|
'd' => 'cop. 1988' |
436 |
|
|
} |
437 |
|
|
], |
438 |
|
|
'990' => [ |
439 |
|
|
'2140', |
440 |
|
|
'88', |
441 |
|
|
'HAY' |
442 |
|
|
], |
443 |
|
|
}; |
444 |
|
|
|
445 |
dpavlin |
15 |
You can later use that hash to produce any output from ISIS data. |
446 |
dpavlin |
12 |
|
447 |
dpavlin |
15 |
If database is created using IsisMarc, it will also have to special fields |
448 |
|
|
which will be used for identifiers, C<i1> and C<i2> like this: |
449 |
|
|
|
450 |
|
|
'200' => [ |
451 |
|
|
{ |
452 |
|
|
'i1' => '1', |
453 |
|
|
'i2' => ' ' |
454 |
|
|
'a' => 'Goa', |
455 |
|
|
'f' => 'Valdo D\'Arienzo', |
456 |
|
|
'e' => 'tipografie e tipografi nel XVI secolo', |
457 |
|
|
} |
458 |
|
|
], |
459 |
|
|
|
460 |
|
|
This method will also create additional field C<000> with MFN. |
461 |
|
|
|
462 |
dpavlin |
12 |
=cut |
463 |
|
|
|
464 |
|
|
sub to_hash { |
465 |
|
|
my $self = shift; |
466 |
|
|
|
467 |
|
|
my $mfn = shift || confess "need mfn!"; |
468 |
|
|
|
469 |
dpavlin |
15 |
# init record to include MFN as field 000 |
470 |
|
|
my $rec = { '000' => $mfn }; |
471 |
|
|
|
472 |
dpavlin |
12 |
my $row = $self->fetch($mfn); |
473 |
|
|
|
474 |
|
|
foreach my $k (keys %{$row}) { |
475 |
|
|
foreach my $l (@{$row->{$k}}) { |
476 |
|
|
|
477 |
|
|
# filter output |
478 |
|
|
$l = $self->{'hash_filter'}->($l) if ($self->{'hash_filter'}); |
479 |
|
|
|
480 |
dpavlin |
15 |
my $val; |
481 |
|
|
|
482 |
|
|
# has identifiers? |
483 |
|
|
($val->{'i1'},$val->{'i2'}) = ($1,$2) if ($l =~ s/^([01 #])([01 #])//); |
484 |
|
|
|
485 |
dpavlin |
12 |
# has subfields? |
486 |
|
|
if ($l =~ m/\^/) { |
487 |
|
|
foreach my $t (split(/\^/,$l)) { |
488 |
|
|
next if (! $t); |
489 |
|
|
$val->{substr($t,0,1)} = substr($t,1); |
490 |
|
|
} |
491 |
|
|
} else { |
492 |
|
|
$val = $l; |
493 |
|
|
} |
494 |
|
|
|
495 |
|
|
push @{$rec->{$k}}, $val; |
496 |
|
|
} |
497 |
|
|
} |
498 |
|
|
|
499 |
|
|
return $rec; |
500 |
|
|
} |
501 |
|
|
|
502 |
dpavlin |
15 |
=head2 tag_name |
503 |
dpavlin |
1 |
|
504 |
dpavlin |
15 |
Return name of selected tag |
505 |
dpavlin |
1 |
|
506 |
dpavlin |
15 |
print $isis->tag_name('200'); |
507 |
|
|
|
508 |
|
|
=cut |
509 |
|
|
|
510 |
|
|
sub tag_name { |
511 |
dpavlin |
1 |
my $self = shift; |
512 |
dpavlin |
15 |
my $tag = shift || return; |
513 |
|
|
return $self->{'TagName'}->{$tag} || $tag; |
514 |
dpavlin |
1 |
} |
515 |
|
|
|
516 |
|
|
1; |
517 |
|
|
|
518 |
|
|
=head1 BUGS |
519 |
|
|
|
520 |
|
|
This module has been very lightly tested. Use with caution and report bugs. |
521 |
|
|
|
522 |
|
|
=head1 AUTHOR |
523 |
|
|
|
524 |
|
|
Dobrica Pavlinusic |
525 |
|
|
CPAN ID: DPAVLIN |
526 |
|
|
dpavlin@rot13.org |
527 |
|
|
http://www.rot13.org/~dpavlin/ |
528 |
|
|
|
529 |
dpavlin |
15 |
This module is based heavily on code from C<LIBISIS.PHP> library to read ISIS files V0.1.1 |
530 |
|
|
written in php and (c) 2000 Franck Martin <franck@sopac.org> and released under LGPL. |
531 |
dpavlin |
1 |
|
532 |
|
|
=head1 COPYRIGHT |
533 |
|
|
|
534 |
|
|
This program is free software; you can redistribute |
535 |
|
|
it and/or modify it under the same terms as Perl itself. |
536 |
|
|
|
537 |
|
|
The full text of the license can be found in the |
538 |
|
|
LICENSE file included with this module. |
539 |
|
|
|
540 |
|
|
|
541 |
|
|
=head1 SEE ALSO |
542 |
|
|
|
543 |
dpavlin |
15 |
OpenIsis web site L<http://www.openisis.org> |
544 |
dpavlin |
1 |
|
545 |
dpavlin |
15 |
perl4lib site L<http://perl4lib.perl.org> |
546 |
|
|
|