185 lines
3.9 KiB
Perl
185 lines
3.9 KiB
Perl
package C4::Input; #assumes C4/Input
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# Copyright 2000-2002 Katipo Communications
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#
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# This file is part of Koha.
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#
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# Koha is free software; you can redistribute it and/or modify it under the
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# terms of the GNU General Public License as published by the Free Software
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# Foundation; either version 2 of the License, or (at your option) any later
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# version.
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#
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# Koha is distributed in the hope that it will be useful, but WITHOUT ANY
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# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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# A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along with
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# Koha; if not, write to the Free Software Foundation, Inc., 59 Temple Place,
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# Suite 330, Boston, MA 02111-1307 USA
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use strict;
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require Exporter;
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use C4::Context;
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use vars qw($VERSION @ISA @EXPORT);
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# set the version for version checking
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$VERSION = 0.01;
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=head1 NAME
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C4::Input - Miscellaneous sanity checks
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=head1 SYNOPSIS
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use C4::Input;
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=head1 DESCRIPTION
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This module provides functions to see whether a given library card
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number or ISBN is valid.
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=head1 FUNCTIONS
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=over 2
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=cut
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@ISA = qw(Exporter);
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@EXPORT = qw(
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&checkdigit &checkvalidisbn
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);
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# FIXME - This is never used.
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#sub checkflds {
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# my ($env,$reqflds,$data) = @_;
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# my $numrflds = @$reqflds;
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# my @probarr;
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# my $i = 0;
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# while ($i < $numrflds) {
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# if ($data->{@$reqflds[$i]} eq "") {
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# push(@probarr, @$reqflds[$i]);
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# }
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# $i++
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# }
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# return (\@probarr);
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#}
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=item checkdigit
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$valid = &checkdigit($env, $cardnumber);
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Takes a card number, computes its check digit, and compares it to the
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checkdigit at the end of C<$cardnumber>. Returns a true value iff
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C<$cardnumber> has a valid check digit.
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C<$env> is ignored.
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=cut
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#'
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sub checkdigit {
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my ($env,$infl, $nounique) = @_;
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$infl = uc $infl;
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#Check to make sure the cardnumber is unique
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#FIXME: We should make the error for a nonunique cardnumber
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#different from the one where the checkdigit on the number is
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#not correct
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if (C4::Context->preference("checkdigit") eq "none") {
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return 1;
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}
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unless ( $nounique )
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{
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my $dbh=C4::Context->dbh;
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my $query=qq{SELECT * FROM borrowers WHERE cardnumber="$infl"};
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my $sth=$dbh->prepare($query);
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$sth->execute;
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my %results = $sth->fetchrow_hashref();
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if ( $sth->rows != 0 )
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{
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return 0;
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}
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}
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my @weightings = (8,4,6,3,5,2,1);
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my $sum;
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my $i = 1;
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my $valid = 0;
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foreach $i (1..7) {
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my $temp1 = $weightings[$i-1];
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my $temp2 = substr($infl,$i,1);
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$sum += $temp1 * $temp2;
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}
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my $rem = ($sum%11);
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if ($rem == 10) {
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$rem = "X";
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}
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if ($rem eq substr($infl,8,1)) {
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$valid = 1;
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}
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return $valid;
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} # sub checkdigit
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=item checkvalidisbn
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$valid = &checkvalidisbn($isbn);
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Returns a true value iff C<$isbn> is a valid ISBN: it must be ten
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digits long (counting "X" as a digit), and must have a valid check
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digit at the end.
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=cut
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#'
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#--------------------------------------
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# Determine if a number is a valid ISBN number, according to length
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# of 10 digits and valid checksum
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sub checkvalidisbn {
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use strict;
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my ($q)=@_ ; # Input: ISBN number
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my $isbngood = 0; # Return: true or false
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$q=~s/x$/X/g; # upshift lower case X
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$q=~s/[^X\d]//g;
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$q=~s/X.//g;
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#return 0 if $q is not ten digits long
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if (length($q)!=10) {
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return 0;
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}
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#If we get to here, length($q) must be 10
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my $checksum=substr($q,9,1);
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my $isbn=substr($q,0,9);
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my $i;
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my $c=0;
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for ($i=0; $i<9; $i++) {
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my $digit=substr($q,$i,1);
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$c+=$digit*(10-$i);
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}
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$c %= 11;
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($c==10) && ($c='X');
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$isbngood = $c eq $checksum;
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return $isbngood;
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} # sub checkvalidisbn
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END { } # module clean-up code here (global destructor)
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1;
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__END__
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=back
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=head1 AUTHOR
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Koha Developement team <info@koha.org>
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=cut
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