Man pages sections > man3 > Algorithm::CheckDigits::MBase_003

CheckDigits::MBase_003 - compute check digits for SICI (Serial Item and

CheckDigits::MBase_003(3pm) User Contributed Perl Documentation CheckDigits::MBase_003(3pm)

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 $number consists solely of numbers and hyphens and the two digits in the middle are valid check digits according to the algorithm given above.
 
Returns false otherwise,
complete($number)
The check digit for $number is computed and inserted into the middle of $number.
 
Returns the complete number with check digit or '' if $number does not consist solely of digits, hyphens and spaces.
basenumber($number)
Returns the basenumber of $number if $number has a valid check digit.
 
Return '' otherwise.
checkdigit($number)
Returns the check digits 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
2008-05-17 perl v5.10.0