Pillow/Tests/test_file_pcx.py

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from .helper import unittest, PillowTestCase, hopper
from PIL import Image, ImageFile, PcxImagePlugin
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class TestFilePcx(PillowTestCase):
def _roundtrip(self, im):
f = self.tempfile("temp.pcx")
im.save(f)
im2 = Image.open(f)
self.assertEqual(im2.mode, im.mode)
self.assertEqual(im2.size, im.size)
self.assertEqual(im2.format, "PCX")
self.assert_image_equal(im2, im)
def test_sanity(self):
for mode in ('1', 'L', 'P', 'RGB'):
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self._roundtrip(hopper(mode))
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# Test an unsupported mode
f = self.tempfile("temp.pcx")
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im = hopper("RGBA")
self.assertRaises(ValueError, im.save, f)
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def test_invalid_file(self):
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invalid_file = "Tests/images/flower.jpg"
self.assertRaises(SyntaxError,
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PcxImagePlugin.PcxImageFile, invalid_file)
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def test_odd(self):
# see issue #523, odd sized images should have a stride that's even.
# not that imagemagick or gimp write pcx that way.
# we were not handling properly.
for mode in ('1', 'L', 'P', 'RGB'):
# larger, odd sized images are better here to ensure that
# we handle interrupted scan lines properly.
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self._roundtrip(hopper(mode).resize((511, 511)))
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def test_pil184(self):
# Check reading of files where xmin/xmax is not zero.
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test_file = "Tests/images/pil184.pcx"
im = Image.open(test_file)
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self.assertEqual(im.size, (447, 144))
self.assertEqual(im.tile[0][1], (0, 0, 447, 144))
# Make sure all pixels are either 0 or 255.
self.assertEqual(im.histogram()[0] + im.histogram()[255], 447*144)
def test_1px_width(self):
im = Image.new('L', (1, 256))
px = im.load()
for y in range(256):
px[0, y] = y
self._roundtrip(im)
def test_large_count(self):
im = Image.new('L', (256, 1))
px = im.load()
for x in range(256):
px[x, 0] = x // 67 * 67
self._roundtrip(im)
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def _test_buffer_overflow(self, im, size=1024):
_last = ImageFile.MAXBLOCK
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ImageFile.MAXBLOCK = size
try:
self._roundtrip(im)
finally:
ImageFile.MAXBLOCK = _last
def test_break_in_count_overflow(self):
im = Image.new('L', (256, 5))
px = im.load()
for y in range(4):
for x in range(256):
px[x, y] = x % 128
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self._test_buffer_overflow(im)
def test_break_one_in_loop(self):
im = Image.new('L', (256, 5))
px = im.load()
for y in range(5):
for x in range(256):
px[x, y] = x % 128
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self._test_buffer_overflow(im)
def test_break_many_in_loop(self):
im = Image.new('L', (256, 5))
px = im.load()
for y in range(4):
for x in range(256):
px[x, y] = x % 128
for x in range(8):
px[x, 4] = 16
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self._test_buffer_overflow(im)
def test_break_one_at_end(self):
im = Image.new('L', (256, 5))
px = im.load()
for y in range(5):
for x in range(256):
px[x, y] = x % 128
px[0, 3] = 128 + 64
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self._test_buffer_overflow(im)
def test_break_many_at_end(self):
im = Image.new('L', (256, 5))
px = im.load()
for y in range(5):
for x in range(256):
px[x, y] = x % 128
for x in range(4):
px[x * 2, 3] = 128 + 64
px[x + 256 - 4, 3] = 0
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self._test_buffer_overflow(im)
def test_break_padding(self):
im = Image.new('L', (257, 5))
px = im.load()
for y in range(5):
for x in range(257):
px[x, y] = x % 128
for x in range(5):
px[x, 3] = 0
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self._test_buffer_overflow(im)
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if __name__ == '__main__':
unittest.main()