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22 changes: 22 additions & 0 deletions Tests/test_imagefile.py
Original file line number Diff line number Diff line change
Expand Up @@ -165,6 +165,28 @@ def test_negative_offset(self) -> None:
with pytest.raises(ValueError, match="Tile offset cannot be negative"):
im.load()

@pytest.mark.parametrize("size", ((1, 0), (0, 1), (0, 0)))
def test_zero_dimension_seek(self, size: tuple[int, int]) -> None:
class ZeroImageFile(ImageFile.ImageFile):
def _open(self) -> None:
self._mode = "1"
self._size = (1, 1)
self._im = Image.core.fill(self.mode, self.size)

def seek(self, frame: int) -> None:
self._size = (0, 0)
self.tile = [ImageFile._Tile("raw")]

self.frame = frame
Image.Image.seek(self, frame)

def tell(self) -> int:
return self.frame

im = ZeroImageFile(BytesIO(b""))
im.seek(1)
im.load()

@pytest.mark.parametrize("xy", ((-1, 0), (0, -1)))
def test_negative_tile_extents(self, xy: tuple[int, int]) -> None:
im = Image.new("1", (1, 1))
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8 changes: 8 additions & 0 deletions src/PIL/ImageFile.py
Original file line number Diff line number Diff line change
Expand Up @@ -300,6 +300,14 @@ def load(self) -> Image.core.PixelAccess | None:
msg = "cannot load this image"
raise OSError(msg)

if self.width == 0 or self.height == 0:
ImageFile.load_prepare(self)

self.tile = []
self.readonly = 0

return Image.Image.load(self)

pixel = Image.Image.load(self)
if not self.tile:
return pixel
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