Issue #1159051: GzipFile now raises EOFError when reading a corrupted file
with truncated header or footer.
Added tests for reading truncated gzip, bzip2, and lzma files.
diff --git a/Lib/test/test_lzma.py b/Lib/test/test_lzma.py
index a13cf3b..4669ee2 100644
--- a/Lib/test/test_lzma.py
+++ b/Lib/test/test_lzma.py
@@ -669,6 +669,20 @@
with LZMAFile(BytesIO(COMPRESSED_XZ[:128])) as f:
self.assertRaises(EOFError, f.read)
+ def test_read_truncated(self):
+ # Drop stream footer: CRC (4 bytes), index size (4 bytes),
+ # flags (2 bytes) and magic number (2 bytes).
+ truncated = COMPRESSED_XZ[:-12]
+ with LZMAFile(BytesIO(truncated)) as f:
+ self.assertRaises(EOFError, f.read)
+ with LZMAFile(BytesIO(truncated)) as f:
+ self.assertEqual(f.read(len(INPUT)), INPUT)
+ self.assertRaises(EOFError, f.read, 1)
+ # Incomplete 12-byte header.
+ for i in range(12):
+ with LZMAFile(BytesIO(truncated[:i])) as f:
+ self.assertRaises(EOFError, f.read, 1)
+
def test_read_bad_args(self):
f = LZMAFile(BytesIO(COMPRESSED_XZ))
f.close()