#19395: Raise exception when pickling a (BZ2|LZMA)(Compressor|Decompressor).

The underlying C libraries provide no mechanism for serializing compressor and
decompressor objects, so actually pickling these classes is impractical.
Previously, these objects would be pickled without error, but attempting to use
a deserialized instance would segfault the interpreter.

1 files changed, 10 insertions, 0 deletions

diff --git a/Lib/test/test_bz2.py b/Lib/test/test_bz2.py
index 912fac1..6764e59 100644
--- a/Lib/test/test_bz2.py
+++ b/Lib/test/test_bz2.py
@@ -5,6 +5,7 @@ from test.support import TESTFN, bigmemtest, _4G
 import unittest
 from io import BytesIO
 import os
+import pickle
 import random
 import subprocess
 import sys
@@ -621,6 +622,11 @@ class BZ2CompressorTest(BaseTest):
         finally:
             data = None
 
+    def testPickle(self):
+        with self.assertRaises(TypeError):
+            pickle.dumps(BZ2Compressor())
+
+
 class BZ2DecompressorTest(BaseTest):
     def test_Constructor(self):
         self.assertRaises(TypeError, BZ2Decompressor, 42)
@@ -672,6 +678,10 @@ class BZ2DecompressorTest(BaseTest):
             compressed = None
             decompressed = None
 
+    def testPickle(self):
+        with self.assertRaises(TypeError):
+            pickle.dumps(BZ2Decompressor())
+
 
 class CompressDecompressTest(BaseTest):
     def testCompress(self):