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# coding=utf-8
#
# Copyright (C) 2007 Martin Owens
#
# 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
"""
Python barcode renderer for RM4CC barcodes. Designed for use with Inkscape.
"""
from .Base import Barcode
charmap = {
"(": "25",
")": "3",
"0": "05053535",
"1": "05152535",
"2": "05153525",
"3": "15052535",
"4": "15053525",
"5": "15152525",
"6": "05251535",
"7": "05350535",
"8": "05351525",
"9": "15250535",
"A": "15251525",
"B": "15350525",
"C": "05253515",
"D": "05352515",
"E": "05353505",
"F": "15252515",
"G": "15253505",
"H": "15352505",
"I": "25051535",
"J": "25150535",
"K": "25151525",
"L": "35050535",
"M": "35051525",
"N": "35150525",
"O": "25053525",
"P": "25152515",
"Q": "25153505",
"R": "35052515",
"S": "35053505",
"T": "35152505",
"U": "25251515",
"V": "25350515",
"W": "25351505",
"X": "35250515",
"Y": "35251505",
"Z": "35350505",
}
check = ["ZUVWXY", "501234", "B6789A", "HCDEFG", "NIJKLM", "TOPQRS"]
(BAR_TRACK, BAR_DOWN, BAR_UP, BAR_FULL, BAR_NONE, WHITE_SPACE) = range(6)
class Rm4scc(Barcode):
"""Provice a Rm4scc barcode generator"""
default_height = 18
def encode(self, text):
result = ""
text = text.upper()
text.replace("(", "")
text.replace(")", "")
text = "(" + text + Rm4scc.checksum(text) + ")"
i = 0
for char in text:
if char in charmap:
result = result + charmap[char]
i += 1
return result
@staticmethod
def checksum(text):
"""given a string of data, return the check character"""
total_lower = 0
total_upper = 0
for char in text:
if char in charmap:
bars = charmap[char][0:8:2]
lower = 0
upper = 0
if int(bars[0]) & 1:
lower += 4
if int(bars[1]) & 1:
lower += 2
if int(bars[2]) & 1:
lower += 1
if int(bars[0]) & 2:
upper += 4
if int(bars[1]) & 2:
upper += 2
if int(bars[2]) & 2:
upper += 1
total_lower += lower % 6
total_upper += upper % 6
total_lower = total_upper % 6
total_upper %= 6
checkchar = check[total_upper][total_lower]
return checkchar
def get_style(self, index):
"""Royal Mail Barcodes use a completely different style"""
result = {"width": 2, "write": True, "top": 0}
if index == BAR_TRACK: # Track Bar
result["top"] = 6
result["height"] = 5
elif index == BAR_DOWN: # Decender Bar
result["top"] = 6
result["height"] = 11
elif index == BAR_UP: # Accender Bar
result["height"] = 11
elif index == BAR_FULL: # Full Bar
result["height"] = 17
elif index == WHITE_SPACE: # White Space
result["write"] = False
return result
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