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-rw-r--r--share/extensions/barcode/Rm4scc.py139
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diff --git a/share/extensions/barcode/Rm4scc.py b/share/extensions/barcode/Rm4scc.py
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+++ b/share/extensions/barcode/Rm4scc.py
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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