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'''
Copyright (C) 2007 Martin Owens
Thanks to Lineaire Chez of Inkbar ( www.inkbar.lineaire.net )
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
'''
from Base import Barcode
import sys
mapLeftFaimly = [
[ "0001101","0011001","0010011","0111101","0100011","0110001","0101111","0111011","0110111","0001011" ],
[ "0100111","0110011","0011011","0100001","0011101","0111001","0000101","0010001","0001001","0010111" ],
]
mapRight = [ "1110010","1100110","1101100","1000010","1011100","1001110","1010000","1000100","1001000","1110100" ]
mapFaimly = [ '000000','001011','001101','001110','010011','011001','011100','010101','010110','011010' ]
guardBar = '202';
centerBar = '02020';
class Object(Barcode):
def encode(self, number):
result = ''
if len(number) < 12 or len(number) > 13 or not number.isdigit():
sys.stderr.write("Can not encode '" + number + "' into EAN13 Barcode, Size must be 12 numbers only\n")
return
if len(number) == 12:
number = number + self.getChecksum(number)
else:
if not self.varifyChecksum(number):
sys.stderr.write("EAN13 Checksum not correct for this barcode, omit last charicter to generate new checksum.\n")
return
result = result + guardBar
family = mapFaimly[int(number[0])]
i = 0
for i in range(0,6):
mapLeft = mapLeftFaimly[int(family[i])]
result += mapLeft[int(number[i+1])]
result += centerBar
for i in range (7,13):
result += mapRight[int(number[i])]
result = result + guardBar;
self.label = number[0] + ' ' + number[1:7] + ' ' + number[7:] + ' '
self.inclabel = self.label
return result;
def getChecksum(self, number):
# UPCA/EAN13
weight=[3,1]*6
magic=10
sum = 0
# We need to work from left to right so reverse
number = number[::-1]
# checksum based on first 12 digits.
for i in range(len(number)):
sum = sum + int(number[i]) * weight[i]
# Mod it down to a single digit
z = ( magic - (sum % magic) ) % magic
if z < 0 or z >= magic:
return 0
return str(z)
def varifyChecksum(self, number):
new = self.getChecksum(number[:12])
existing = number[12]
return new == existing
def getStyle(self, index):
result = { 'width' : '1', 'top' : int(self.y), 'write' : True }
if index==0: # White Space
result['write'] = False
elif index==1: # Black Bar
result['height'] = int(self.height)
elif index==2: # Guide Bar
result['height'] = int(self.height) + 5
return result
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