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d50445ff30
Similar to the recent adoption of Black. isort is a Python utility to sort imports alphabetically and automatically separate into sections. By using isort, contributors can quickly and automatically conform to the projects style without thinking. Just let the tool do it. Uses the configuration recommended by the Black to avoid conflicts of style. Rewrite TestImageQt.test_deprecated to no rely on import order.
69 lines
1.8 KiB
Python
69 lines
1.8 KiB
Python
import zlib
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from io import BytesIO
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from PIL import Image, ImageFile, PngImagePlugin
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from .helper import PillowTestCase, unittest
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TEST_FILE = "Tests/images/png_decompression_dos.png"
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class TestPngDos(PillowTestCase):
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def test_ignore_dos_text(self):
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ImageFile.LOAD_TRUNCATED_IMAGES = True
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try:
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im = Image.open(TEST_FILE)
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im.load()
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finally:
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ImageFile.LOAD_TRUNCATED_IMAGES = False
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for s in im.text.values():
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self.assertLess(len(s), 1024 * 1024, "Text chunk larger than 1M")
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for s in im.info.values():
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self.assertLess(len(s), 1024 * 1024, "Text chunk larger than 1M")
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def test_dos_text(self):
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try:
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im = Image.open(TEST_FILE)
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im.load()
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except ValueError as msg:
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self.assertTrue(msg, "Decompressed Data Too Large")
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return
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for s in im.text.values():
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self.assertLess(len(s), 1024 * 1024, "Text chunk larger than 1M")
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def test_dos_total_memory(self):
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im = Image.new("L", (1, 1))
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compressed_data = zlib.compress(b"a" * 1024 * 1023)
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info = PngImagePlugin.PngInfo()
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for x in range(64):
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info.add_text("t%s" % x, compressed_data, zip=True)
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info.add_itxt("i%s" % x, compressed_data, zip=True)
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b = BytesIO()
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im.save(b, "PNG", pnginfo=info)
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b.seek(0)
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try:
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im2 = Image.open(b)
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except ValueError as msg:
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self.assertIn("Too much memory", msg)
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return
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total_len = 0
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for txt in im2.text.values():
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total_len += len(txt)
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self.assertLess(
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total_len, 64 * 1024 * 1024, "Total text chunks greater than 64M"
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)
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if __name__ == "__main__":
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unittest.main()
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