Pillow/Tests/test_imagefile.py

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from helper import unittest, PillowTestCase, hopper, fromstring, tostring
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from io import BytesIO
from PIL import Image
from PIL import ImageFile
from PIL import EpsImagePlugin
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codecs = dir(Image.core)
# save original block sizes
MAXBLOCK = ImageFile.MAXBLOCK
SAFEBLOCK = ImageFile.SAFEBLOCK
class TestImageFile(PillowTestCase):
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def test_parser(self):
def roundtrip(format):
im = hopper("L").resize((1000, 1000))
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if format in ("MSP", "XBM"):
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()
parser.feed(data)
imOut = parser.close()
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return im, imOut
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self.assert_image_equal(*roundtrip("BMP"))
im1, im2 = roundtrip("GIF")
self.assert_image_similar(im1.convert('P'), im2, 1)
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self.assert_image_equal(*roundtrip("IM"))
self.assert_image_equal(*roundtrip("MSP"))
if "zip_encoder" in codecs:
try:
# force multiple blocks in PNG driver
ImageFile.MAXBLOCK = 8192
self.assert_image_equal(*roundtrip("PNG"))
finally:
ImageFile.MAXBLOCK = MAXBLOCK
self.assert_image_equal(*roundtrip("PPM"))
self.assert_image_equal(*roundtrip("TIFF"))
self.assert_image_equal(*roundtrip("XBM"))
self.assert_image_equal(*roundtrip("TGA"))
self.assert_image_equal(*roundtrip("PCX"))
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if EpsImagePlugin.has_ghostscript():
im1, im2 = roundtrip("EPS")
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# This test fails on Ubuntu 12.04, PPC (Bigendian) It
# appears to be a ghostscript 9.05 bug, since the
# 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:
self.assert_image_similar(im1, im2.convert('L'), 20)
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if "jpeg_encoder" in codecs:
im1, im2 = roundtrip("JPEG") # lossy compression
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):
with open('Tests/images/python.ico', 'rb') as f:
data = f.read()
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with ImageFile.Parser() as p:
p.feed(data)
self.assertEqual((48, 48), p.image.size)
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def test_safeblock(self):
if "zip_encoder" not in codecs:
self.skipTest("PNG (zlib) encoder not available")
im1 = hopper()
try:
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ImageFile.SAFEBLOCK = 1
im2 = fromstring(tostring(im1, "PNG"))
finally:
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ImageFile.SAFEBLOCK = SAFEBLOCK
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):
with self.assertRaises(TypeError):
parser = ImageFile.Parser()
parser.feed(1)
def test_truncated_with_errors(self):
if "zip_encoder" not in codecs:
self.skipTest("PNG (zlib) encoder not available")
im = Image.open("Tests/images/truncated_image.png")
with self.assertRaises(IOError):
im.load()
def test_truncated_without_errors(self):
if "zip_encoder" not in codecs:
self.skipTest("PNG (zlib) encoder not available")
im = Image.open("Tests/images/truncated_image.png")
ImageFile.LOAD_TRUNCATED_IMAGES = True
try:
im.load()
finally:
ImageFile.LOAD_TRUNCATED_IMAGES = False
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def test_broken_datastream_with_errors(self):
if "zip_encoder" not in codecs:
self.skipTest("PNG (zlib) encoder not available")
im = Image.open("Tests/images/broken_data_stream.png")
with self.assertRaises(IOError):
im.load()
def test_broken_datastream_without_errors(self):
if "zip_encoder" not in codecs:
self.skipTest("PNG (zlib) encoder not available")
im = Image.open("Tests/images/broken_data_stream.png")
ImageFile.LOAD_TRUNCATED_IMAGES = True
try:
im.load()
finally:
ImageFile.LOAD_TRUNCATED_IMAGES = False
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class MockPyDecoder(ImageFile.PyDecoder):
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):
def _open(self):
self.rawmode = 'RGBA'
self.mode = 'RGBA'
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):
def get_decoder(self):
decoder = MockPyDecoder(None)
def closure(mode, *args):
decoder.__init__(mode, *args)
return decoder
Image.register_decoder('MOCK', closure)
return decoder
def test_setimage(self):
buf = BytesIO(b'\x00'*255)
im = MockImageFile(buf)
d = self.get_decoder()
im.load()
self.assertEqual(d.state.xoff, xoff)
self.assertEqual(d.state.yoff, yoff)
self.assertEqual(d.state.xsize, xsize)
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):
buf = BytesIO(b'\x00'*255)
im = MockImageFile(buf)
im.tile = [("MOCK", None, 32, None)]
d = self.get_decoder()
im.load()
self.assertEqual(d.state.xoff, 0)
self.assertEqual(d.state.yoff, 0)
self.assertEqual(d.state.xsize, 200)
self.assertEqual(d.state.ysize, 200)
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def test_negsize(self):
buf = BytesIO(b'\x00'*255)
im = MockImageFile(buf)
im.tile = [("MOCK", (xoff, yoff, -10, yoff+ysize), 32, None)]
d = self.get_decoder()
self.assertRaises(ValueError, im.load)
im.tile = [("MOCK", (xoff, yoff, xoff+xsize, -10), 32, None)]
self.assertRaises(ValueError, im.load)
def test_oversize(self):
buf = BytesIO(b'\x00'*255)
im = MockImageFile(buf)
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im.tile = [
("MOCK", (xoff, yoff, xoff+xsize + 100, yoff+ysize), 32, None)
]
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d = self.get_decoder()
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)
def test_no_format(self):
buf = BytesIO(b'\x00'*255)
im = MockImageFile(buf)
self.assertIsNone(im.format)
self.assertIsNone(im.get_format_mimetype())
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if __name__ == '__main__':
unittest.main()