Include small upstream bencode fix and flake8 file

deluge/bencode.py

@@ -12,6 +12,7 @@
 
 # Minor modifications made by Andrew Resch to replace the BTFailure errors with Exceptions
 
+
 def decode_int(x, f):
     f += 1
     newf = x.index('e', f)
@@ -23,6 +24,7 @@ def decode_int(x, f):
         raise ValueError
     return (n, newf+1)
 
+
 def decode_string(x, f):
     colon = x.index(':', f)
     n = int(x[f:colon])
@@ -31,6 +33,7 @@ def decode_string(x, f):
     colon += 1
     return (x[colon:colon+n], colon+n)
 
+
 def decode_list(x, f):
     r, f = [], f+1
     while x[f] != 'e':
@@ -38,6 +41,7 @@ def decode_list(x, f):
         r.append(v)
     return (r, f + 1)
 
+
 def decode_dict(x, f):
     r, f = {}, f+1
     while x[f] != 'e':
@@ -60,11 +64,14 @@ decode_func['7'] = decode_string
 decode_func['8'] = decode_string
 decode_func['9'] = decode_string
 
+
 def bdecode(x):
     try:
         r, l = decode_func[x[0]](x, 0)
     except (IndexError, KeyError, ValueError):
         raise Exception("not a valid bencoded string")
+    if l != len(x):
+        raise Exception("invalid bencoded value (data after valid prefix)")
 
     return r
 
@@ -78,28 +85,34 @@ class Bencached(object):
     def __init__(self, s):
         self.bencoded = s
 
-def encode_bencached(x,r):
+
+def encode_bencached(x, r):
     r.append(x.bencoded)
 
+
 def encode_int(x, r):
     r.extend(('i', str(x), 'e'))
 
+
 def encode_bool(x, r):
     if x:
         encode_int(1, r)
     else:
         encode_int(0, r)
 
+
 def encode_string(x, r):
     r.extend((str(len(x)), ':', x))
 
+
 def encode_list(x, r):
     r.append('l')
     for i in x:
         encode_func[type(i)](i, r)
     r.append('e')
 
-def encode_dict(x,r):
+
+def encode_dict(x, r):
     r.append('d')
     ilist = x.items()
     ilist.sort()
@@ -123,6 +136,7 @@ try:
 except ImportError:
     pass
 
+
 def bencode(x):
     r = []
     encode_func[type(x)](x, r)