Use eof instance variable to determine whether compression has ended.

The unconsumed tail has a possibility to be empty, even if the end of compression is not reached

Author: rhpvorderman

Lib/test/test_zlib.py

@@ -358,7 +358,7 @@ def test_decompimax(self, source=None, cx=256, dcx=64):
         dco = zlib.decompressobj()
         bufs = []
         cb = combuf
-        while cb:
+        while not dco.eof:
             #max_length = 1 + len(cb)//10
             chunk = dco.decompress(cb, dcx)
             self.assertFalse(len(chunk) > dcx,
@@ -383,7 +383,7 @@ def test_decompressmaxlen(self, flush=False):
         dco = zlib.decompressobj()
         bufs = []
         cb = combuf
-        while cb:
+        while not dco.eof:
             max_length = 1 + len(cb)//10
             chunk = dco.decompress(cb, max_length)
             self.assertFalse(len(chunk) > max_length,
@@ -393,7 +393,7 @@ def test_decompressmaxlen(self, flush=False):
         if flush:
             bufs.append(dco.flush())
         else:
-            while chunk:
+            while not dco.eof:
                 chunk = dco.decompress(b'', max_length)
                 self.assertFalse(len(chunk) > max_length,
                             'chunk too big (%d>%d)' % (len(chunk),max_length))