mirror of
https://github.com/python-pillow/Pillow.git
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422 lines
12 KiB
Python
422 lines
12 KiB
Python
from __future__ import annotations
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from io import BytesIO
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from typing import Any
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import pytest
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from PIL import (
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BmpImagePlugin,
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EpsImagePlugin,
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Image,
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ImageFile,
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UnidentifiedImageError,
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_binary,
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features,
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)
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from .helper import (
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assert_image,
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assert_image_equal,
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assert_image_similar,
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fromstring,
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hopper,
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skip_unless_feature,
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tostring,
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)
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# save original block sizes
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MAXBLOCK = ImageFile.MAXBLOCK
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SAFEBLOCK = ImageFile.SAFEBLOCK
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class TestImageFile:
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def test_parser(self) -> None:
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def roundtrip(format: str) -> tuple[Image.Image, Image.Image]:
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im = hopper("L").resize((1000, 1000), Image.Resampling.NEAREST)
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if format in ("MSP", "XBM"):
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im = im.convert("1")
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test_file = BytesIO()
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im.copy().save(test_file, format)
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data = test_file.getvalue()
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parser = ImageFile.Parser()
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parser.feed(data)
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im_out = parser.close()
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return im, im_out
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assert_image_equal(*roundtrip("BMP"))
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im1, im2 = roundtrip("GIF")
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assert_image_similar(im1.convert("P"), im2, 1)
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assert_image_equal(*roundtrip("IM"))
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assert_image_equal(*roundtrip("MSP"))
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if features.check("zlib"):
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try:
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# force multiple blocks in PNG driver
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ImageFile.MAXBLOCK = 8192
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assert_image_equal(*roundtrip("PNG"))
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finally:
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ImageFile.MAXBLOCK = MAXBLOCK
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assert_image_equal(*roundtrip("PPM"))
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assert_image_equal(*roundtrip("TIFF"))
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assert_image_equal(*roundtrip("XBM"))
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assert_image_equal(*roundtrip("TGA"))
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assert_image_equal(*roundtrip("PCX"))
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if EpsImagePlugin.has_ghostscript():
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im1, im2 = roundtrip("EPS")
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# This test fails on Ubuntu 12.04, PPC (Bigendian) It
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# appears to be a ghostscript 9.05 bug, since the
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# ghostscript rendering is wonky and the file is identical
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# to that written on ubuntu 12.04 x64
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# md5sum: ba974835ff2d6f3f2fd0053a23521d4a
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# EPS comes back in RGB:
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assert_image_similar(im1, im2.convert("L"), 20)
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if features.check("jpg"):
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im1, im2 = roundtrip("JPEG") # lossy compression
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assert_image(im1, im2.mode, im2.size)
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with pytest.raises(OSError):
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roundtrip("PDF")
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def test_ico(self) -> None:
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with open("Tests/images/python.ico", "rb") as f:
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data = f.read()
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with ImageFile.Parser() as p:
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p.feed(data)
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assert p.image is not None
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assert (48, 48) == p.image.size
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@skip_unless_feature("webp")
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def test_incremental_webp(self) -> None:
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with ImageFile.Parser() as p:
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with open("Tests/images/hopper.webp", "rb") as f:
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p.feed(f.read(1024))
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# Check that insufficient data was given in the first feed
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assert not p.image
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p.feed(f.read())
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assert p.image is not None
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assert (128, 128) == p.image.size
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@skip_unless_feature("zlib")
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def test_safeblock(self) -> None:
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im1 = hopper()
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try:
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ImageFile.SAFEBLOCK = 1
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im2 = fromstring(tostring(im1, "PNG"))
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finally:
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ImageFile.SAFEBLOCK = SAFEBLOCK
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assert_image_equal(im1, im2)
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def test_raise_oserror(self) -> None:
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with pytest.warns(DeprecationWarning):
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with pytest.raises(OSError):
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ImageFile.raise_oserror(1)
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def test_raise_typeerror(self) -> None:
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with pytest.raises(TypeError):
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parser = ImageFile.Parser()
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parser.feed(1) # type: ignore[arg-type]
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def test_negative_stride(self) -> None:
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with open("Tests/images/raw_negative_stride.bin", "rb") as f:
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input = f.read()
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p = ImageFile.Parser()
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p.feed(input)
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with pytest.raises(OSError):
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p.close()
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def test_no_format(self) -> None:
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buf = BytesIO(b"\x00" * 255)
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class DummyImageFile(ImageFile.ImageFile):
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def _open(self) -> None:
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self._mode = "RGB"
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self._size = (1, 1)
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im = DummyImageFile(buf)
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assert im.format is None
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assert im.get_format_mimetype() is None
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def test_oserror(self) -> None:
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im = Image.new("RGB", (1, 1))
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with pytest.raises(OSError):
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im.save(BytesIO(), "JPEG2000", num_resolutions=2)
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def test_truncated(self) -> None:
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b = BytesIO(
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b"BM000000000000" # head_data
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+ _binary.o32le(
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ImageFile.SAFEBLOCK + 1 + 4
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) # header_size, so BmpImagePlugin will try to read SAFEBLOCK + 1 bytes
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+ (
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b"0" * ImageFile.SAFEBLOCK
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) # only SAFEBLOCK bytes, so that the header is truncated
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)
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with pytest.raises(OSError) as e:
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BmpImagePlugin.BmpImageFile(b)
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assert str(e.value) == "Truncated File Read"
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@skip_unless_feature("zlib")
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def test_truncated_with_errors(self) -> None:
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with Image.open("Tests/images/truncated_image.png") as im:
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with pytest.raises(OSError):
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im.load()
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# Test that the error is raised if loaded a second time
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with pytest.raises(OSError):
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im.load()
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@skip_unless_feature("zlib")
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def test_truncated_without_errors(self) -> None:
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with Image.open("Tests/images/truncated_image.png") as im:
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ImageFile.LOAD_TRUNCATED_IMAGES = True
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try:
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im.load()
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finally:
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ImageFile.LOAD_TRUNCATED_IMAGES = False
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@skip_unless_feature("zlib")
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def test_broken_datastream_with_errors(self) -> None:
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with Image.open("Tests/images/broken_data_stream.png") as im:
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with pytest.raises(OSError):
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im.load()
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@skip_unless_feature("zlib")
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def test_broken_datastream_without_errors(self) -> None:
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with Image.open("Tests/images/broken_data_stream.png") as im:
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ImageFile.LOAD_TRUNCATED_IMAGES = True
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try:
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im.load()
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finally:
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ImageFile.LOAD_TRUNCATED_IMAGES = False
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class MockPyDecoder(ImageFile.PyDecoder):
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last: MockPyDecoder
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def __init__(self, mode: str, *args: Any) -> None:
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MockPyDecoder.last = self
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super().__init__(mode, *args)
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def decode(self, buffer: bytes) -> tuple[int, int]:
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# eof
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return -1, 0
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class MockPyEncoder(ImageFile.PyEncoder):
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last: MockPyEncoder | None
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def __init__(self, mode: str, *args: Any) -> None:
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MockPyEncoder.last = self
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super().__init__(mode, *args)
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def encode(self, bufsize: int) -> tuple[int, int, bytes]:
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return 1, 1, b""
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def cleanup(self) -> None:
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self.cleanup_called = True
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xoff, yoff, xsize, ysize = 10, 20, 100, 100
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class MockImageFile(ImageFile.ImageFile):
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def _open(self) -> None:
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self.rawmode = "RGBA"
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self._mode = "RGBA"
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self._size = (200, 200)
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self.tile = [("MOCK", (xoff, yoff, xoff + xsize, yoff + ysize), 32, None)]
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class CodecsTest:
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@classmethod
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def setup_class(cls) -> None:
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Image.register_decoder("MOCK", MockPyDecoder)
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Image.register_encoder("MOCK", MockPyEncoder)
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class TestPyDecoder(CodecsTest):
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def test_setimage(self) -> None:
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buf = BytesIO(b"\x00" * 255)
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im = MockImageFile(buf)
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im.load()
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assert MockPyDecoder.last.state.xoff == xoff
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assert MockPyDecoder.last.state.yoff == yoff
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assert MockPyDecoder.last.state.xsize == xsize
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assert MockPyDecoder.last.state.ysize == ysize
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with pytest.raises(ValueError):
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MockPyDecoder.last.set_as_raw(b"\x00")
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def test_extents_none(self) -> None:
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buf = BytesIO(b"\x00" * 255)
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im = MockImageFile(buf)
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im.tile = [("MOCK", None, 32, None)]
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im.load()
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assert MockPyDecoder.last.state.xoff == 0
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assert MockPyDecoder.last.state.yoff == 0
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assert MockPyDecoder.last.state.xsize == 200
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assert MockPyDecoder.last.state.ysize == 200
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def test_negsize(self) -> None:
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buf = BytesIO(b"\x00" * 255)
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im = MockImageFile(buf)
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im.tile = [("MOCK", (xoff, yoff, -10, yoff + ysize), 32, None)]
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with pytest.raises(ValueError):
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im.load()
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im.tile = [("MOCK", (xoff, yoff, xoff + xsize, -10), 32, None)]
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with pytest.raises(ValueError):
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im.load()
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def test_oversize(self) -> None:
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buf = BytesIO(b"\x00" * 255)
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im = MockImageFile(buf)
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im.tile = [("MOCK", (xoff, yoff, xoff + xsize + 100, yoff + ysize), 32, None)]
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with pytest.raises(ValueError):
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im.load()
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im.tile = [("MOCK", (xoff, yoff, xoff + xsize, yoff + ysize + 100), 32, None)]
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with pytest.raises(ValueError):
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im.load()
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def test_decode(self) -> None:
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decoder = ImageFile.PyDecoder("")
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with pytest.raises(NotImplementedError):
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decoder.decode(b"")
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class TestPyEncoder(CodecsTest):
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def test_setimage(self) -> None:
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buf = BytesIO(b"\x00" * 255)
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im = MockImageFile(buf)
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fp = BytesIO()
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ImageFile._save(
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im,
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fp,
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[
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ImageFile._Tile(
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"MOCK", (xoff, yoff, xoff + xsize, yoff + ysize), 0, "RGB"
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)
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],
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)
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assert MockPyEncoder.last
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assert MockPyEncoder.last.state.xoff == xoff
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assert MockPyEncoder.last.state.yoff == yoff
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assert MockPyEncoder.last.state.xsize == xsize
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assert MockPyEncoder.last.state.ysize == ysize
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def test_extents_none(self) -> None:
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buf = BytesIO(b"\x00" * 255)
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im = MockImageFile(buf)
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im.tile = [("MOCK", None, 32, None)]
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fp = BytesIO()
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ImageFile._save(im, fp, [ImageFile._Tile("MOCK", None, 0, "RGB")])
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assert MockPyEncoder.last
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assert MockPyEncoder.last.state.xoff == 0
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assert MockPyEncoder.last.state.yoff == 0
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assert MockPyEncoder.last.state.xsize == 200
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assert MockPyEncoder.last.state.ysize == 200
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def test_negsize(self) -> None:
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buf = BytesIO(b"\x00" * 255)
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im = MockImageFile(buf)
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fp = BytesIO()
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MockPyEncoder.last = None
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with pytest.raises(ValueError):
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ImageFile._save(
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im,
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fp,
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[ImageFile._Tile("MOCK", (xoff, yoff, -10, yoff + ysize), 0, "RGB")],
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)
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last: MockPyEncoder | None = MockPyEncoder.last
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assert last
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assert last.cleanup_called
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with pytest.raises(ValueError):
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ImageFile._save(
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im,
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fp,
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[ImageFile._Tile("MOCK", (xoff, yoff, xoff + xsize, -10), 0, "RGB")],
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)
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def test_oversize(self) -> None:
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buf = BytesIO(b"\x00" * 255)
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im = MockImageFile(buf)
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fp = BytesIO()
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with pytest.raises(ValueError):
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ImageFile._save(
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im,
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fp,
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[
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ImageFile._Tile(
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"MOCK", (xoff, yoff, xoff + xsize + 100, yoff + ysize), 0, "RGB"
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)
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],
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)
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with pytest.raises(ValueError):
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ImageFile._save(
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im,
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fp,
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[
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ImageFile._Tile(
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"MOCK", (xoff, yoff, xoff + xsize, yoff + ysize + 100), 0, "RGB"
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)
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],
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)
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def test_encode(self) -> None:
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encoder = ImageFile.PyEncoder("")
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with pytest.raises(NotImplementedError):
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encoder.encode(0)
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bytes_consumed, errcode = encoder.encode_to_pyfd()
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assert bytes_consumed == 0
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assert ImageFile.ERRORS[errcode] == "bad configuration"
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encoder._pushes_fd = True
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with pytest.raises(NotImplementedError):
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encoder.encode_to_pyfd()
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fh = BytesIO()
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with pytest.raises(NotImplementedError):
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encoder.encode_to_file(fh, 0)
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def test_zero_height(self) -> None:
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with pytest.raises(UnidentifiedImageError):
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Image.open("Tests/images/zero_height.j2k")
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