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