1 files changed, 98 insertions, 0 deletions
diff --git a/share/extensions/barcode/Code39.py b/share/extensions/barcode/Code39.py
new file mode 100644
index 0000000..a0ee2e2
--- /dev/null
+++ b/share/extensions/barcode/Code39.py
@@ -0,0 +1,98 @@
+# 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, USA.
+#
+"""
+Python barcode renderer for Code39 barcodes. Designed for use with Inkscape.
+"""
+
+from .Base import Barcode
+
+ENCODE = {
+    '0': '000110100',
+    '1': '100100001',
+    '2': '001100001',
+    '3': '101100000',
+    '4': '000110001',
+    '5': '100110000',
+    '6': '001110000',
+    '7': '000100101',
+    '8': '100100100',
+    '9': '001100100',
+    'A': '100001001',
+    'B': '001001001',
+    'C': '101001000',
+    'D': '000011001',
+    'E': '100011000',
+    'F': '001011000',
+    'G': '000001101',
+    'H': '100001100',
+    'I': '001001100',
+    'J': '000011100',
+    'K': '100000011',
+    'L': '001000011',
+    'M': '101000010',
+    'N': '000010011',
+    'O': '100010010',
+    'P': '001010010',
+    'Q': '000000111',
+    'R': '100000110',
+    'S': '001000110',
+    'T': '000010110',
+    'U': '110000001',
+    'V': '011000001',
+    'W': '111000000',
+    'X': '010010001',
+    'Y': '110010000',
+    'Z': '011010000',
+    '-': '010000101',
+    '*': '010010100',
+    '+': '010001010',
+    '$': '010101000',
+    '%': '000101010',
+    '/': '010100010',
+    '.': '110000100',
+    ' ': '011000100',
+}
+
+
+class Code39(Barcode):
+    """Convert a text into string binary of black and white markers"""
+
+    def encode(self, text):
+        self.text = text.upper()
+        result = ''
+        # It is possible for us to encode code39
+        # into full ascii, but this feature is
+        # not enabled here
+        for char in '*' + self.text + '*':
+            if char not in ENCODE:
+                char = '-'
+            result = result + ENCODE[char] + '0'
+
+        # Now we need to encode the code39, best read
+        # the code to understand what it's up to:
+        encoded = ''
+        colour = '1'  # 1 = Black, 0 = White
+        for data in result:
+            if data == '1':
+                encoded = encoded + colour + colour
+            else:
+                encoded = encoded + colour
+            colour = colour == '1' and '0' or '1'
+
+        return encoded