1 files changed, 69 insertions, 0 deletions
diff --git a/share/extensions/barcode/Code25i.py b/share/extensions/barcode/Code25i.py
new file mode 100644
index 0000000..e655f6c
--- /dev/null
+++ b/share/extensions/barcode/Code25i.py
@@ -0,0 +1,69 @@
+# coding=utf-8
+#
+# 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA.
+#
+"""
+Generate barcodes for Code25-interleaved 2 of 5, for Inkscape.
+"""
+
+from .Base import Barcode
+
+# 1 means thick, 0 means thin
+ENCODE = {
+    '0': '00110',
+    '1': '10001',
+    '2': '01001',
+    '3': '11000',
+    '4': '00101',
+    '5': '10100',
+    '6': '01100',
+    '7': '00011',
+    '8': '10010',
+    '9': '01010',
+}
+
+
+class Code25i(Barcode):
+    """Convert a text into string binary of black and white markers"""
+
+    # Start and stop code are already encoded into white (0) and black(1) bars
+    def encode(self, number):
+        if not number.isdigit():
+            return self.error(number, "CODE25 can only encode numbers.")
+
+        # 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 = '1010'
+        for i in range(size):
+            # First in the pair is encoded in black (1), second in white (0)
+            black = ENCODE[number[i * 2]]
+            white = ENCODE[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'
+        return encoded + '1101'