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..87f346a
--- /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 = "0" if colour == "1" else "1"
+
+        return encoded