commit 71b6c1af727fbe13525fb734568057d78cea33f3
author Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> Wed Oct 31 05:36:20 2018 -0700
committer GitHub <noreply@github.com> Wed Oct 31 05:36:20 2018 -0700
tree 5c21fd44694813a375597f3aa5e49f43e965f2fd
parent da15389fddb85cf8a97b81e75de7d77b5f505b56

bpo-35062: Fix parsing _io.IncrementalNewlineDecoder's *translate* argument. (GH-10217)


_io.IncrementalNewlineDecoder's initializer possibly assigns out-of-range
value to the bitwise struct field.
(cherry picked from commit b08746bfdf64e55ce33516f2065fa2aa4f51be95)

Co-authored-by: Xiang Zhang <angwerzx@126.com>

Lib/test/test_io.py

diff --git a/Lib/test/test_io.py b/Lib/test/test_io.py
index c68b2fe..b41141e 100644
--- a/Lib/test/test_io.py
+++ b/Lib/test/test_io.py
@@ -3748,6 +3748,16 @@
         dec = self.IncrementalNewlineDecoder(None, translate=True)
         _check(dec)
 
+    def test_translate(self):
+        # issue 35062
+        for translate in (-2, -1, 1, 2):
+            decoder = codecs.getincrementaldecoder("utf-8")()
+            decoder = self.IncrementalNewlineDecoder(decoder, translate)
+            self.check_newline_decoding_utf8(decoder)
+        decoder = codecs.getincrementaldecoder("utf-8")()
+        decoder = self.IncrementalNewlineDecoder(decoder, translate=0)
+        self.assertEqual(decoder.decode(b"\r\r\n"), "\r\r\n")
+
 class CIncrementalNewlineDecoderTest(IncrementalNewlineDecoderTest):
     pass