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); |
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|
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); |
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$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 (); |
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=head1 NAME |
=head1 NAME |
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|
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IsisDB - Read CDS/ISIS, WinISIS and IsisMarc database |
Biblio::Isis - Read CDS/ISIS, WinISIS and IsisMarc database |
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|
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=head1 SYNOPSIS |
=head1 SYNOPSIS |
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|
|
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use IsisDB; |
use Biblio::Isis; |
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|
|
27 |
my $isis = new IsisDB( |
my $isis = new Biblio::Isis( |
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isisdb => './cds/cds', |
isisdb => './cds/cds', |
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); |
); |
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|
|
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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 |
} |
} |
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|
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=head1 DESCRIPTION |
=head1 DESCRIPTION |
36 |
|
|
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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 |
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seems to depriciate it's old C<XS> bindings for perl. |
40 |
|
|
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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>), |
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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 |
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>. |
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|
|
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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 |
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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 |
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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 |
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creates data structures which are easier to use than ones created by |
creates data structures which are easier to use than ones created by |
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|
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Open ISIS database |
Open ISIS database |
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|
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my $isis = new IsisDB( |
my $isis = new Biblio::Isis( |
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isisdb => './cds/cds', |
isisdb => './cds/cds', |
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read_fdt => 1, |
read_fdt => 1, |
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include_deleted => 1, |
include_deleted => 1, |
97 |
=item isisdb |
=item isisdb |
98 |
|
|
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This is full or relative path to ISIS database files which include |
This is full or relative path to ISIS database files which include |
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common prefix of C<.FDT>, C<.MST>, C<.CNT>, C<.XRF> and C<.MST> files. |
common prefix of C<.MST>, and C<.XRF> and optionally C<.FDT> (if using |
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C<read_fdt> option) files. |
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|
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In this example it uses C<./cds/cds.MST> and related files. |
In this example it uses C<./cds/cds.MST> and related files. |
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=back |
=back |
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It will also set C<$isis-E<gt>{'maxmfn'}> which is maximum MFN stored in database. |
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=cut |
=cut |
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sub new { |
sub new { |
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$self->{$v} = {@_}->{$v}; |
$self->{$v} = {@_}->{$v}; |
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} |
} |
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my @isis_files = grep(/\.(FDT|MST|XRF|CNT)$/i,glob($self->{isisdb}."*")); |
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139 |
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foreach my $f (@isis_files) { |
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my $ext = $1 if ($f =~ m/\.(\w\w\w)$/); |
141 |
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$self->{lc($ext)."_file"} = $f; |
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} |
143 |
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144 |
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my @must_exist = qw(mst xrf); |
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push @must_exist, "fdt" if ($self->{read_fdt}); |
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147 |
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foreach my $ext (@must_exist) { |
148 |
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unless ($self->{$ext."_file"}) { |
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carp "missing ",uc($ext)," file in ",$self->{isisdb}; |
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return; |
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} |
152 |
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} |
153 |
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if ($self->{debug}) { |
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print STDERR "## using files: ",join(" ",@isis_files),"\n"; |
156 |
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eval "use Data::Dump"; |
157 |
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158 |
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if (! $@) { |
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*Dumper = *Data::Dump::dump; |
160 |
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} else { |
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use Data::Dumper; |
162 |
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} |
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} |
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# 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}) { |
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|
|
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# read the $db.FDT file for tags |
# read the $db.FDT file for tags |
169 |
my $fieldzone=0; |
my $fieldzone=0; |
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|
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}': $!"; |
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binmode($fileFDT); |
173 |
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|
174 |
while (<fileFDT>) { |
while (<$fileFDT>) { |
175 |
chomp; |
chomp; |
176 |
if ($fieldzone) { |
if ($fieldzone) { |
177 |
my $name=substr($_,0,30); |
my $name=substr($_,0,30); |
188 |
} |
} |
189 |
} |
} |
190 |
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|
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close(fileFDT); |
close($fileFDT); |
192 |
} |
} |
193 |
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|
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# Get the Maximum MFN from $db.MST |
# Get the Maximum MFN from $db.MST |
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open(fileMST,$self->{isisdb}.".MST") || croak "can't read '$self->{isisdb}.MST': $!"; |
open($self->{'fileMST'}, $self->{mst_file}) || croak "can't open '$self->{mst_file}': $!"; |
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binmode($self->{'fileMST'}); |
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|
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# MST format: (* = 32 bit signed) |
# MST format: (* = 32 bit signed) |
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# CTLMFN* always 0 |
# CTLMFN* always 0 |
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# NXTMFB* last block allocated to master file |
# NXTMFB* last block allocated to master file |
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# NXTMFP offset to next available position in last block |
# NXTMFP offset to next available position in last block |
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# 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 |
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|
207 |
my $buff; |
my $buff; |
208 |
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|
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"; |
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# save maximum MFN |
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$self->{'maxmfn'} = $self->{'NXTMFN'} - 1; |
|
211 |
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|
212 |
close(fileMST); |
print STDERR "## self ",Dumper($self),"\n" if ($self->{debug}); |
213 |
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|
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# Get the index information from $db.CNT |
# open files for later |
215 |
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open($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'}); |
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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($buff); |
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218 |
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$self ? return $self : return undef; |
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} |
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close(fileCNT); |
=head2 count |
222 |
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print Dumper($self),"\n" if ($self->{debug}); |
Return number of records in database |
224 |
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|
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# open files for later |
print $isis->count; |
|
open($self->{'fileXRF'}, $self->{isisdb}.".XRF") || croak "can't open '$self->{isisdb}.XRF': $!"; |
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227 |
open($self->{'fileMST'}, $self->{isisdb}.".MST") || croak "can't open '$self->{isisdb}.MST': $!"; |
=cut |
228 |
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|
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$self ? return $self : return undef; |
sub count { |
230 |
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my $self = shift; |
231 |
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return $self->{'NXTMFN'} - 1; |
232 |
} |
} |
233 |
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=head2 fetch |
=head2 fetch |
252 |
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|
253 |
my $mfn = shift || croak "fetch needs MFN as argument!"; |
my $mfn = shift || croak "fetch needs MFN as argument!"; |
254 |
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255 |
print "fetch: $mfn\n" if ($self->{debug}); |
# is mfn allready in memory? |
256 |
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my $old_mfn = $self->{'current_mfn'} || -1; |
257 |
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return $self->{record} if ($mfn == $old_mfn); |
258 |
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259 |
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print STDERR "## fetch: $mfn\n" if ($self->{debug}); |
260 |
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|
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 |
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|
267 |
my $buff; |
my $buff; |
268 |
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269 |
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# delete old record |
270 |
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delete $self->{record}; |
271 |
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|
272 |
# read XRFMFB abd XRFMFP |
# read XRFMFB abd XRFMFP |
273 |
read($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 |
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return; |
278 |
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} else { |
279 |
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warn "pointer for MFN $mfn is null\n"; |
280 |
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return; |
281 |
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} |
282 |
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} |
283 |
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|
284 |
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# check for logically deleted record |
285 |
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if ($pointer & 0x80000000) { |
286 |
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print STDERR "## record $mfn is logically deleted\n" if ($self->{debug}); |
287 |
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$self->{deleted} = $mfn; |
288 |
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|
289 |
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return unless $self->{include_deleted}; |
290 |
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291 |
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# abs |
292 |
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$pointer = ($pointer ^ 0xffffffff) + 1; |
293 |
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} |
294 |
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|
295 |
my $XRFMFB = int($pointer/2048); |
my $XRFMFB = int($pointer/2048); |
296 |
my $XRFMFP = $pointer - ($XRFMFB*2048); |
my $XRFMFP = $pointer - ($XRFMFB*2048); |
297 |
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|
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!! |
|
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# e.g. (XRFMFB - 1) * 512 + XRFMFP |
|
300 |
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|
301 |
my $offset = $pointer; |
my $blk_off = (($XRFMFB - 1) * 512) + ($XRFMFP % 512); |
|
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)+$offset3; |
|
302 |
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303 |
print "$offset - $offset2 - $offset3 - $offset4\n" if ($self->{debug}); |
print STDERR "## pointer: $pointer XRFMFB: $XRFMFB XRFMFP: $XRFMFP offset: $blk_off\n" if ($self->{'debug'}); |
304 |
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|
305 |
# Get Record Information |
# Get Record Information |
306 |
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|
307 |
seek($self->{'fileMST'},$offset4,0); |
seek($self->{'fileMST'},$blk_off,0) || croak "can't seek to $blk_off: $!"; |
308 |
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|
309 |
read($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 |
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312 |
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print STDERR "## offset for rowid $value is $blk_off (blk $XRFMFB off $XRFMFP)\n" if ($self->{debug}); |
313 |
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|
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 |
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} |
320 |
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|
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); |
|
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# $NVF=$self->Read16($fileMST); |
|
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# $STATUS=$self->Read16($fileMST); |
|
324 |
|
|
325 |
read($self->{'fileMST'}, $buff, 14); |
read($self->{'fileMST'}, $buff, 14); |
326 |
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|
327 |
my ($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; |
|
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} |
|
334 |
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|
335 |
# Get Directory Format |
# Get Directory Format |
336 |
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|
340 |
|
|
341 |
read($self->{'fileMST'}, $buff, 6 * $NVF); |
read($self->{'fileMST'}, $buff, 6 * $NVF); |
342 |
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|
343 |
my $fld_len = 0; |
my $rec_len = 0; |
344 |
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|
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); |
|
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# $LEN=$self->Read16($fileMST); |
|
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|
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my ($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 |
# |
# |
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 ; $i++) { |
375 |
# skip zero-sized fields |
# skip zero-sized fields |
377 |
|
|
378 |
push @{$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 |
408 |
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|
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 |
|
|
428 |
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|
429 |
my $hash = $isis->to_hash($mfn); |
my $hash = $isis->to_hash($mfn); |
430 |
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|
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 |
|
|
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/\^/) { |
523 |
return $self->{'TagName'}->{$tag} || $tag; |
return $self->{'TagName'}->{$tag} || $tag; |
524 |
} |
} |
525 |
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|
526 |
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|
527 |
|
=head2 read_cnt |
528 |
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|
529 |
|
Read content of C<.CNT> file and return hash containing it. |
530 |
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|
531 |
|
print Dumper($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 |
|
|