Pillow/Tests/test_decompression_bomb.py
2019-09-30 18:45:13 +10:00

87 lines
2.8 KiB
Python

from PIL import Image
from .helper import PillowTestCase, hopper
TEST_FILE = "Tests/images/hopper.ppm"
ORIGINAL_LIMIT = Image.MAX_IMAGE_PIXELS
class TestDecompressionBomb(PillowTestCase):
def tearDown(self):
Image.MAX_IMAGE_PIXELS = ORIGINAL_LIMIT
def test_no_warning_small_file(self):
# Implicit assert: no warning.
# A warning would cause a failure.
Image.MAX_IMAGE_PIXELS = ORIGINAL_LIMIT
Image.open(TEST_FILE)
def test_no_warning_no_limit(self):
# Arrange
# Turn limit off
Image.MAX_IMAGE_PIXELS = None
self.assertIsNone(Image.MAX_IMAGE_PIXELS)
# Act / Assert
# Implicit assert: no warning.
# A warning would cause a failure.
Image.open(TEST_FILE)
def test_warning(self):
# Set limit to trigger warning on the test file
Image.MAX_IMAGE_PIXELS = 128 * 128 - 1
self.assertEqual(Image.MAX_IMAGE_PIXELS, 128 * 128 - 1)
self.assert_warning(Image.DecompressionBombWarning, Image.open, TEST_FILE)
def test_exception(self):
# Set limit to trigger exception on the test file
Image.MAX_IMAGE_PIXELS = 64 * 128 - 1
self.assertEqual(Image.MAX_IMAGE_PIXELS, 64 * 128 - 1)
self.assertRaises(Image.DecompressionBombError, lambda: Image.open(TEST_FILE))
def test_exception_ico(self):
with self.assertRaises(Image.DecompressionBombError):
Image.open("Tests/images/decompression_bomb.ico")
def test_exception_gif(self):
with self.assertRaises(Image.DecompressionBombError):
Image.open("Tests/images/decompression_bomb.gif")
class TestDecompressionCrop(PillowTestCase):
def setUp(self):
self.src = hopper()
Image.MAX_IMAGE_PIXELS = self.src.height * self.src.width * 4 - 1
def tearDown(self):
Image.MAX_IMAGE_PIXELS = ORIGINAL_LIMIT
def testEnlargeCrop(self):
# Crops can extend the extents, therefore we should have the
# same decompression bomb warnings on them.
box = (0, 0, self.src.width * 2, self.src.height * 2)
self.assert_warning(Image.DecompressionBombWarning, self.src.crop, box)
def test_crop_decompression_checks(self):
im = Image.new("RGB", (100, 100))
good_values = ((-9999, -9999, -9990, -9990), (-999, -999, -990, -990))
warning_values = ((-160, -160, 99, 99), (160, 160, -99, -99))
error_values = ((-99909, -99990, 99999, 99999), (99909, 99990, -99999, -99999))
for value in good_values:
self.assertEqual(im.crop(value).size, (9, 9))
for value in warning_values:
self.assert_warning(Image.DecompressionBombWarning, im.crop, value)
for value in error_values:
with self.assertRaises(Image.DecompressionBombError):
im.crop(value)