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Code128.py

00001 '''
Copyright (C) 2007 Martin Owens

Debugged by Ralf Heinecke & Martin Siepmann 09/07/2007
Debugged by Horst Schottky Feb. 27. 2010

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 math
import re

map = [ '11011001100','11001101100','11001100110','10010011000','10010001100','10001001100','10011001000','10011000100','10001100100','11001001000','11001000100','11000100100','10110011100','10011011100','10011001110','10111001100','10011101100','10011100110','11001110010','11001011100','11001001110','11011100100','11001110100','11101101110','11101001100','11100101100','11100100110','11101100100','11100110100','11100110010','11011011000','11011000110','11000110110','10100011000','10001011000','10001000110','10110001000','10001101000','10001100010','11010001000','11000101000','11000100010','10110111000','10110001110','10001101110','10111011000','10111000110','10001110110','11101110110','11010001110','11000101110','11011101000','11011100010','11011101110','11101011000','11101000110','11100010110','11101101000','11101100010','11100011010','11101111010','11001000010','11110001010','10100110000','10100001100','10010110000','10010000110','10000101100','10000100110','10110010000','10110000100','10011010000','10011000010','10000110100','10000110010','11000010010','11001010000','11110111010','11000010100','10001111010','10100111100','10010111100','10010011110','10111100100','10011110100','10011110010','11110100100','11110010100','11110010010','11011011110','11011110110','11110110110','10101111000','10100011110','10001011110','10111101000','10111100010','11110101000','11110100010','10111011110','10111101110','11101011110','11110101110','11010000100','11010010000','11010011100','11000111010','11' ]

def mapExtra(sd, chars):
      result = list(sd)
      for char in chars:
            result.append(chr(char))
      result.append('FNC3')
      result.append('FNC2')
      result.append('SHIFT')
      return result

# The mapExtra method is used to slim down the amount
# of pre code and instead we generate the lists
charAB = list(' !"#$%&\'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_')
charA = mapExtra(charAB, range(0, 31)) # Offset 64
charB = mapExtra(charAB, range(96, 125)) # Offset -32

class Object(Barcode):
      def encode(self, text):
            result = ''
            blocks = []
            block  = ''

            # Split up into sections of numbers, or charicters
            # This makes sure that all the charicters are encoded
            # In the best way posible for Code128
            for datum in re.findall(r'(?:(?:\d\d){2,})|(?:^\d\d)|.', text):
                  if len(datum) == 1:
                        block = block + datum
                  else:
                        if block:
                              blocks.append(self.bestBlock(block))
                              block = ''
                        blocks.append( [ 'C', datum ] )

            if block:
                  blocks.append(self.bestBlock(block))
                  block = '';
            
            self.inclabel = text
            return self.encodeBlocks(blocks)

      def bestBlock(self, block):
            # If this has lower case then select B over A
            if block.upper() == block:
                  return [ 'A', block ]
            return [ 'B', block ]
            
      def encodeBlocks(self, blocks):
            total  = 0
            pos    = 0
            encode = '';
      
            for block in blocks:
                  set   = block[0]
                  datum = block[1]

                  # POS :   0,   1
                  # A   : 101, 103
                  # B   : 100, 104
                  # C   :  99, 105
                  num = 0;
                  if set == 'A':
                        num = 103
                  elif set == 'B':
                        num = 104
                  elif set == 'C':
                        num = 105

                  i = pos
                  if pos:
                        num = 204 - num
                  else:
                        i = 1

                  total = total + num * i
                  encode = encode + map[num]
                  pos = pos + 1

                  if set == 'A' or set == 'B':
                        chars = charB
                        if set == 'A':
                              chars = charA

                        for char in datum:
                              total = total + (chars.index(char) * pos)
                              encode = encode + map[chars.index(char)]
                              pos = pos + 1
                  else:
                        for char in (datum[i:i+2] for i in range(0, len(datum), 2)):
                              total = total + (int(char) * pos)
                              encode = encode + map[int(char)]
                              pos = pos + 1
      
            checksum = total % 103
            encode = encode + map[checksum]
            encode = encode + map[106]
            encode = encode + map[107]
      
            return encode


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