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#!/usr/bin/ruby
#
# Copyright (c) 2010, John D. Lewis <balinjdl at gmail.com>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
# * Neither the name of the author nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
class Isbn_checker
def verify_checkDigit(isbn_in, printValids)
if isbn_in.length == 13
return verify_checkDigit13(isbn_in.upcase, printValids)
elsif isbn_in.length == 10
return verify_checkDigit10(isbn_in.upcase, printValids)
else
return nil
end
end
def verify_checkDigit10(isbn_in, printValids)
retVal = false
if (isbn_in.length == 10)
chkDgtX = calc_checkDigit10(isbn_in[0,isbn_in.length-1])
#puts "chkDgtX = #{chkDgtX}; isbn_in = #{isbn_in}; isbn(substr) = #{isbn_in[0,isbn_in.length-1]}"
if isbn_in == isbn_in[0,isbn_in.length-1].to_s + chkDgtX.to_s.upcase
retVal=true
if printValids
puts "valid check digit found in isbn #{isbn_in}!"
end
else
puts "INVALID check digit in isbn #{isbn_in}!"
end
else
puts "invalid isbn_in length (#{isbn_in.length})"
end
retVal
end
def verify_checkDigit13(isbn_in, printValids)
retVal = false
if (isbn_in.length == 13)
chkDgt = calc_checkDigit13(isbn_in[0,isbn_in.length-1])
#puts "chkDgt = #{chkDgt}; isbn_in = #{isbn_in}; isbn(substr) = #{isbn_in[0,isbn_in.length-1]}"
if isbn_in == isbn_in[0,isbn_in.length-1].to_s + chkDgt.to_s
retVal=true
if printValids
puts "valid check digit found in isbn #{isbn_in}!"
end
else
puts "INVALID check digit in isbn #{isbn_in}!"
end
else
puts "invalid isbn_in length (#{isbn_in.length})"
end
retVal
end
def calc_checkDigit(isbn_in)
if isbn_in.length == 13
return calc_checkDigit13(isbn_in)
elsif isbn_in.length == 10
return calc_checkDigit10(isbn_in)
else
return nil
end
end
def calc_checkDigit10(isbn_in)
charPos = 0
csumTotal = 0
iarr = isbn_in.split(//)
for i2 in iarr
charPos += 1
csumTotal = csumTotal + (charPos * i2.to_i)
#puts "csumTotal (running) = #{csumTotal}"
end
#puts "csumTotal = #{csumTotal}"
checkDigit = csumTotal % 11
if (checkDigit == 10)
checkDigit = "X"
end
#puts "for partial isbn #{isbn_in} the checkDigit = #{checkDigit}; complete isbn = #{isbn_in}#{checkDigit}"
checkDigit
end
def calc_checkDigit13(isbn_in)
charPos = 0
csumTotal = 0
iarr = isbn_in.split(//)
for i1 in iarr
cP2 = charPos/2.to_f
#puts "#{cP2}; #{cP2.round}; #{cP2.floor}"
if (cP2.round == cP2.floor)
csumTotal = csumTotal + i1.to_i
#puts "csumTotal_a = #{csumTotal} + #{i1.to_i}"
else
csumTotal = csumTotal + (3*i1.to_i)
#puts "csumTotal_b = #{csumTotal} + #{3*i1.to_i}"
end
charPos += 1
end
#puts "csumTotal = #{csumTotal}"
if (csumTotal == (csumTotal/10.to_i)*10)
checkDigit = "0"
else
checkDigit = 10-(csumTotal - (csumTotal/10.to_i)*10)
end
#puts "checkDigit = 10-(#{csumTotal} - #{(csumTotal/10.to_i)*10})"
if (checkDigit == 10)
checkDigit = "X"
end
#puts "for partial isbn #{isbn_in} the checkDigit = #{checkDigit}; complete isbn = #{isbn_in}#{checkDigit}"
checkDigit
end
def fix_isbn(isbn)
return isbn[0,isbn.length-1] + calc_checkDigit(isbn).to_s
end
def check_isbnFile(filename)
isbns_checked = isbns_valid = isbns_invalid = 0
File.open(filename, "r") do |f|
f.each { |isbn|
isbn = isbn.chomp
if verify_checkDigit(isbn, false) == false
puts "#{isbn} is invalid; proper ISBN should be " + fix_isbn(isbn)
isbns_invalid +=1
else
isbns_valid+=1
end
isbns_checked += 1
}
end
puts "checked #{isbns_checked} isbns; #{isbns_invalid} invalid (#{(isbns_invalid/isbns_checked)*100.round}%) & #{isbns_valid} valid (#{(isbns_valid/isbns_checked)*100.round}%)"
end
def initialize()
end
def new
end
end
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