1 files changed, 38 insertions, 0 deletions
diff --git a/io_import_dxf/dxfgrabber/decode.py b/io_import_dxf/dxfgrabber/decode.py
new file mode 100755
index 00000000..3187cc8f
--- /dev/null
+++ b/io_import_dxf/dxfgrabber/decode.py
@@ -0,0 +1,38 @@
+# Purpose: decode DXF proprietary data
+# Created: 01.05.2014
+# Copyright (C) 2014, Manfred Moitzi
+# License: MIT License
+from __future__ import unicode_literals
+__author__ = "mozman <mozman@gmx.at>"
+
+from . import PYTHON3
+
+_replacement_table = {
+    0x20: ' ',
+    0x40: '_',
+    0x5F: '@',
+}
+for c in range(0x41, 0x5F):
+    _replacement_table[c] = chr(0x41 + (0x5E - c))  # 0x5E -> 'A', 0x5D->'B', ...
+
+
+def decode(text_lines):
+    def _decode(text):
+        s = []
+        skip = False
+        if PYTHON3:
+            text = bytes(text, 'ascii')
+        else:
+            text = map(ord, text)
+
+        for c in text:
+            if skip:
+                skip = False
+                continue
+            if c in _replacement_table:
+                s += _replacement_table[c]
+                skip = (c == 0x5E)  # skip space after 'A'
+            else:
+                s += chr(c ^ 0x5F)
+        return ''.join(s)
+    return [_decode(line) for line in text_lines]