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33dabf986f
The unittest in helper.py has not offered an interesting abstraction
since dbe9f85c7d so import from the more
typical stdlib location.
70 lines
1.8 KiB
Python
70 lines
1.8 KiB
Python
import unittest
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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
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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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