Code25i.py revision 12a239f8730c2bb6e3738d5e75b3237877594d07
#
# Copyright (C) 2010 Geoffrey Mosini
#
# 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
#
"""
Generate barcodes for Code25-interleaved 2 of 5, for Inkscape.
"""
from Base import Barcode
import sys
# 1 means thick, 0 means thin
encoding = {
'0' : '00110',
'1' : '10001',
'2' : '01001',
'3' : '11000',
'4' : '00101',
'5' : '10100',
'6' : '01100',
'7' : '00011',
'8' : '10010',
'9' : '01010',
}
# Start and stop code are already encoded into white (0) and black(1) bars
start_code = '1010'
stop_code = '1101'
class Code25i(Barcode):
# Convert a text into string binary of black and white markers
def encode(self, number):
self.label = number
if not number.isdigit():
sys.stderr.write("CODE25 can only encode numbers.\n")
return
# Number of figures to encode must be even, a 0 is added to the left in case it's odd.
if len(number) % 2 > 0 :
number = '0' + number
# Number is encoded by pairs of 2 figures
size = len(number) / 2;
encoded = start_code;
for i in range(size):
# First in the pair is encoded in black (1), second in white (0)
black = encoding[number[i*2]]
white = encoding[number[i*2+1]]
for j in range(5):
if black[j] == '1':
encoded += '11'
else:
encoded += '1'
if white[j] == '1':
encoded += '00'
else:
encoded += '0'
encoded += stop_code
self.inclabel = number
return encoded;