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110 lines
3.7 KiB
Python
110 lines
3.7 KiB
Python
from __future__ import annotations
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import pytest
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from PIL import Image
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from .helper import hopper
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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:
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def test_no_warning_small_file(self) -> None:
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# Implicit assert: no warning.
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# A warning would cause a failure.
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with Image.open(TEST_FILE):
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pass
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def test_no_warning_no_limit(self, monkeypatch: pytest.MonkeyPatch) -> None:
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# Arrange
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# Turn limit off
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monkeypatch.setattr(Image, "MAX_IMAGE_PIXELS", None)
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assert Image.MAX_IMAGE_PIXELS is None
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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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with Image.open(TEST_FILE):
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pass
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def test_warning(self, monkeypatch: pytest.MonkeyPatch) -> None:
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# Set limit to trigger warning on the test file
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monkeypatch.setattr(Image, "MAX_IMAGE_PIXELS", 128 * 128 - 1)
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assert Image.MAX_IMAGE_PIXELS == 128 * 128 - 1
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with pytest.warns(Image.DecompressionBombWarning):
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with Image.open(TEST_FILE):
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pass
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def test_exception(self, monkeypatch: pytest.MonkeyPatch) -> None:
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# Set limit to trigger exception on the test file
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monkeypatch.setattr(Image, "MAX_IMAGE_PIXELS", 64 * 128 - 1)
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assert Image.MAX_IMAGE_PIXELS == 64 * 128 - 1
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with pytest.raises(Image.DecompressionBombError):
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with Image.open(TEST_FILE):
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pass
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def test_exception_ico(self) -> None:
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with pytest.raises(Image.DecompressionBombError):
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with Image.open("Tests/images/decompression_bomb.ico"):
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pass
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def test_exception_gif(self) -> None:
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with pytest.raises(Image.DecompressionBombError):
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with Image.open("Tests/images/decompression_bomb.gif"):
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pass
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def test_exception_gif_extents(self) -> None:
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with Image.open("Tests/images/decompression_bomb_extents.gif") as im:
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with pytest.raises(Image.DecompressionBombError):
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im.seek(1)
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def test_exception_gif_zero_width(self, monkeypatch: pytest.MonkeyPatch) -> None:
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# Set limit to trigger exception on the test file
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monkeypatch.setattr(Image, "MAX_IMAGE_PIXELS", 4 * 64 * 128)
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assert Image.MAX_IMAGE_PIXELS == 4 * 64 * 128
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with pytest.raises(Image.DecompressionBombError):
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with Image.open("Tests/images/zero_width.gif"):
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pass
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def test_exception_bmp(self) -> None:
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with pytest.raises(Image.DecompressionBombError):
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with Image.open("Tests/images/bmp/b/reallybig.bmp"):
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pass
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class TestDecompressionCrop:
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@classmethod
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def setup_class(cls) -> None:
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width, height = 128, 128
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Image.MAX_IMAGE_PIXELS = height * width * 4 - 1
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@classmethod
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def teardown_class(cls) -> None:
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Image.MAX_IMAGE_PIXELS = ORIGINAL_LIMIT
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def test_enlarge_crop(self) -> None:
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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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with hopper() as src:
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box = (0, 0, src.width * 2, src.height * 2)
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with pytest.warns(Image.DecompressionBombWarning):
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src.crop(box)
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def test_crop_decompression_checks(self) -> None:
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im = Image.new("RGB", (100, 100))
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for value in ((-9999, -9999, -9990, -9990), (-999, -999, -990, -990)):
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assert im.crop(value).size == (9, 9)
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with pytest.warns(Image.DecompressionBombWarning):
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im.crop((-160, -160, 99, 99))
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with pytest.raises(Image.DecompressionBombError):
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im.crop((-99909, -99990, 99999, 99999))
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