From 51461609a05743adae7018932a986e3f4455f55e Mon Sep 17 00:00:00 2001
From: Anton Khirnov <anton@khirnov.net>
Date: Thu, 15 Sep 2022 11:14:53 +0200
Subject: Handle map characters outside of the alphabet.

Can happen when importing maps from elsewhere.
---
 fshare.py | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/fshare.py b/fshare.py
index 6528602..228f5e6 100755
--- a/fshare.py
+++ b/fshare.py
@@ -179,7 +179,13 @@ class URLMap:
             data = [l.strip().split() for l in self._file.readlines()]
             self._short_to_full = dict(data)
             self._full_to_short = dict(((b, a) for (a, b) in data))
-            self._next_id       = self._enc.decode_url(data[-1][0]) if len(data) else 0
+
+            try:
+                self._next_id = self._enc.decode_url(data[-1][0])
+            except (IndexError, ValueError):
+                # data is empty or the mapping uses characters not in alphabet
+                self._next_id = 0
+
         except:
             self.close()
             raise
-- 
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