CheckDigits::MBase_003User Contributed Perl DocumentaCheckDigits::MBase_003(3)NAME
CheckDigits::MBase_003 - compute check digits for SICI (Serial Item and
Contribution Identifier)
SYNOPSIS
use Algorithm::CheckDigits;
$sici = CheckDigits('sici');
if ($sici->is_valid('0784-8679(20040308)6:<138>2.0.TX;2-H')) {
# do something
}
$cn = $sici->complete('0784-8679(20040308)6:<138>2.0.TX;2-');
# $cn = '0784-8679(20040308)6:<138>2.0.TX;2-H'
$cd = $sici->checkdigit('0784-8679(20040308)6:<138>2.0.TX;2-H');
# $cd = 'H'
$bn = $sici->basenumber('0784-8679(20040308)6:<138>2.0.TX;2-H');
# $bn = '0784-8679(20040308)6:<138>2.0.TX;2-';
DESCRIPTION
ALGORITHM
0 In the string describing the number all letters (A-Z) are replaced
with numbers 10-35 accordingly. All other non-numbers are replaced
by 36.
1 Beginning right the numbers at all odd positions are added.
2 The sum from step 1 is multiplied by 3.
3 Beginning right the numbers at all even positions are added.
4 The sums from step 2 and 3 are added.
5 The sum from step 4 is taken modulo 37.
6 The checksum is 37 minus the sum from step 5 where numbers from 10
to 35 are represented by 'A' to 'Z' accordingly and 36 is
represented by '#'.
METHODS
is_valid($number)
Returns true only if the last letter is a valid check letter
according to the algorithm given above.
Returns false otherwise,
complete($number)
The check letter for $number is computed and appended the end of
$number.
Returns the complete number with check letter or ''.
basenumber($number)
Returns the basenumber of $number if $number has a valid check
digit.
Return '' otherwise.
checkdigit($number)
Returns the check letter of $number if $number has valid check
digits.
Return '' otherwise.
EXPORT
None by default.
AUTHOR
Mathias Weidner, <mathias@weidner.in-bad-schmiedeberg.de>
SEE ALSO
perl, CheckDigits, www.pruefziffernberechnung.de,
http://sunsite.berkeley.edu/SICI/sici.pdf
perl v5.14.1 2009-11-20 CheckDigits::MBase_003(3)
