mirror of
https://github.com/python-pillow/Pillow.git
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4cd4adddc3
Follow Python's file object semantics. User code is responsible for closing resources (usually through a context manager) in a deterministic way. To achieve this, remove __del__ functions. These functions used to closed open file handlers in an attempt to silence Python ResourceWarnings. However, using __del__ has the following drawbacks: - __del__ isn't called until the object's reference count reaches 0. Therefore, resource handlers remain open or in use longer than necessary. - The __del__ method isn't guaranteed to execute on system exit. See the Python documentation: https://docs.python.org/3/reference/datamodel.html#object.__del__ > It is not guaranteed that __del__() methods are called for objects > that still exist when the interpreter exits. - Exceptions that occur inside __del__ are ignored instead of raised. This has the potential of hiding bugs. This is also in the Python documentation: > Warning: Due to the precarious circumstances under which __del__() > methods are invoked, exceptions that occur during their execution > are ignored, and a warning is printed to sys.stderr instead. Instead, always close resource handlers when they are no longer in use. This will close the file handler at a specified point in the user's code and not wait until the interpreter chooses to. It is always guaranteed to run. And, if an exception occurs while closing the file handler, the bug will not be ignored. Now, when code receives a ResourceWarning, it will highlight an area that is mishandling resources. It should not simply be silenced, but fixed by closing resources with a context manager. All warnings that were emitted during tests have been cleaned up. To enable warnings, I passed the `-Wa` CLI option to Python. This exposed some mishandling of resources in ImageFile.__init__() and SpiderImagePlugin.loadImageSeries(), they too were fixed.
336 lines
10 KiB
Python
336 lines
10 KiB
Python
from io import BytesIO
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from PIL import EpsImagePlugin, Image, ImageFile
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from .helper import PillowTestCase, fromstring, hopper, tostring, unittest
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try:
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from PIL import _webp
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HAVE_WEBP = True
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except ImportError:
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HAVE_WEBP = False
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codecs = dir(Image.core)
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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(PillowTestCase):
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def test_parser(self):
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def roundtrip(format):
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im = hopper("L").resize((1000, 1000))
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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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imOut = parser.close()
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return im, imOut
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self.assert_image_equal(*roundtrip("BMP"))
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im1, im2 = roundtrip("GIF")
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self.assert_image_similar(im1.convert("P"), im2, 1)
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self.assert_image_equal(*roundtrip("IM"))
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self.assert_image_equal(*roundtrip("MSP"))
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if "zip_encoder" in codecs:
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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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self.assert_image_equal(*roundtrip("PNG"))
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finally:
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ImageFile.MAXBLOCK = MAXBLOCK
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self.assert_image_equal(*roundtrip("PPM"))
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self.assert_image_equal(*roundtrip("TIFF"))
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self.assert_image_equal(*roundtrip("XBM"))
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self.assert_image_equal(*roundtrip("TGA"))
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self.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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self.assert_image_similar(im1, im2.convert("L"), 20)
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if "jpeg_encoder" in codecs:
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im1, im2 = roundtrip("JPEG") # lossy compression
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self.assert_image(im1, im2.mode, im2.size)
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self.assertRaises(IOError, roundtrip, "PDF")
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def test_ico(self):
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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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self.assertEqual((48, 48), p.image.size)
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def test_safeblock(self):
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if "zip_encoder" not in codecs:
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self.skipTest("PNG (zlib) encoder not available")
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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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self.assert_image_equal(im1, im2)
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def test_raise_ioerror(self):
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self.assertRaises(IOError, ImageFile.raise_ioerror, 1)
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def test_raise_typeerror(self):
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with self.assertRaises(TypeError):
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parser = ImageFile.Parser()
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parser.feed(1)
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def test_negative_stride(self):
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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 self.assertRaises(IOError):
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p.close()
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def test_truncated_with_errors(self):
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if "zip_encoder" not in codecs:
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self.skipTest("PNG (zlib) encoder not available")
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with Image.open("Tests/images/truncated_image.png") as im:
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with self.assertRaises(IOError):
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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 self.assertRaises(IOError):
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im.load()
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def test_truncated_without_errors(self):
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if "zip_encoder" not in codecs:
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self.skipTest("PNG (zlib) encoder not available")
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im = Image.open("Tests/images/truncated_image.png")
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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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def test_broken_datastream_with_errors(self):
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if "zip_encoder" not in codecs:
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self.skipTest("PNG (zlib) encoder not available")
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im = Image.open("Tests/images/broken_data_stream.png")
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with self.assertRaises(IOError):
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im.load()
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def test_broken_datastream_without_errors(self):
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if "zip_encoder" not in codecs:
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self.skipTest("PNG (zlib) encoder not available")
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im = Image.open("Tests/images/broken_data_stream.png")
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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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def decode(self, buffer):
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# eof
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return -1, 0
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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):
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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 TestPyDecoder(PillowTestCase):
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def get_decoder(self):
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decoder = MockPyDecoder(None)
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def closure(mode, *args):
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decoder.__init__(mode, *args)
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return decoder
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Image.register_decoder("MOCK", closure)
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return decoder
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def test_setimage(self):
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buf = BytesIO(b"\x00" * 255)
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im = MockImageFile(buf)
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d = self.get_decoder()
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im.load()
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self.assertEqual(d.state.xoff, xoff)
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self.assertEqual(d.state.yoff, yoff)
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self.assertEqual(d.state.xsize, xsize)
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self.assertEqual(d.state.ysize, ysize)
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self.assertRaises(ValueError, d.set_as_raw, b"\x00")
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def test_extents_none(self):
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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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d = self.get_decoder()
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im.load()
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self.assertEqual(d.state.xoff, 0)
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self.assertEqual(d.state.yoff, 0)
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self.assertEqual(d.state.xsize, 200)
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self.assertEqual(d.state.ysize, 200)
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def test_negsize(self):
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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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self.get_decoder()
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self.assertRaises(ValueError, im.load)
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im.tile = [("MOCK", (xoff, yoff, xoff + xsize, -10), 32, None)]
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self.assertRaises(ValueError, im.load)
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def test_oversize(self):
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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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self.get_decoder()
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self.assertRaises(ValueError, im.load)
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im.tile = [("MOCK", (xoff, yoff, xoff + xsize, yoff + ysize + 100), 32, None)]
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self.assertRaises(ValueError, im.load)
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def test_no_format(self):
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buf = BytesIO(b"\x00" * 255)
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im = MockImageFile(buf)
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self.assertIsNone(im.format)
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self.assertIsNone(im.get_format_mimetype())
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def test_exif_jpeg(self):
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im = Image.open("Tests/images/exif-72dpi-int.jpg") # Little endian
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exif = im.getexif()
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self.assertNotIn(258, exif)
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self.assertIn(40960, exif)
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self.assertEqual(exif[40963], 450)
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self.assertEqual(exif[11], "gThumb 3.0.1")
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out = self.tempfile("temp.jpg")
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exif[258] = 8
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del exif[40960]
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exif[40963] = 455
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exif[11] = "Pillow test"
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im.save(out, exif=exif)
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with Image.open(out) as reloaded:
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reloaded_exif = reloaded.getexif()
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self.assertEqual(reloaded_exif[258], 8)
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self.assertNotIn(40960, exif)
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self.assertEqual(reloaded_exif[40963], 455)
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self.assertEqual(exif[11], "Pillow test")
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im = Image.open("Tests/images/no-dpi-in-exif.jpg") # Big endian
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exif = im.getexif()
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self.assertNotIn(258, exif)
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self.assertIn(40962, exif)
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self.assertEqual(exif[40963], 200)
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self.assertEqual(exif[305], "Adobe Photoshop CC 2017 (Macintosh)")
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out = self.tempfile("temp.jpg")
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exif[258] = 8
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del exif[34665]
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exif[40963] = 455
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exif[305] = "Pillow test"
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im.save(out, exif=exif)
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with Image.open(out) as reloaded:
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reloaded_exif = reloaded.getexif()
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self.assertEqual(reloaded_exif[258], 8)
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self.assertNotIn(40960, exif)
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self.assertEqual(reloaded_exif[40963], 455)
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self.assertEqual(exif[305], "Pillow test")
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@unittest.skipIf(
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not HAVE_WEBP or not _webp.HAVE_WEBPANIM,
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"WebP support not installed with animation",
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)
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def test_exif_webp(self):
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im = Image.open("Tests/images/hopper.webp")
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exif = im.getexif()
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self.assertEqual(exif, {})
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out = self.tempfile("temp.webp")
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exif[258] = 8
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exif[40963] = 455
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exif[305] = "Pillow test"
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def check_exif():
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with Image.open(out) as reloaded:
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reloaded_exif = reloaded.getexif()
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self.assertEqual(reloaded_exif[258], 8)
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self.assertEqual(reloaded_exif[40963], 455)
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self.assertEqual(exif[305], "Pillow test")
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im.save(out, exif=exif)
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check_exif()
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im.save(out, exif=exif, save_all=True)
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check_exif()
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def test_exif_png(self):
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im = Image.open("Tests/images/exif.png")
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exif = im.getexif()
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self.assertEqual(exif, {274: 1})
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out = self.tempfile("temp.png")
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exif[258] = 8
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del exif[274]
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exif[40963] = 455
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exif[305] = "Pillow test"
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im.save(out, exif=exif)
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with Image.open(out) as reloaded:
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reloaded_exif = reloaded.getexif()
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self.assertEqual(reloaded_exif, {258: 8, 40963: 455, 305: "Pillow test"})
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def test_exif_interop(self):
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with Image.open("Tests/images/flower.jpg") as im:
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exif = im.getexif()
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self.assertEqual(
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exif.get_ifd(0xA005), {1: "R98", 2: b"0100", 4097: 2272, 4098: 1704}
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)
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