Pillow/Tests/test_file_pcx.py

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import pytest
from PIL import Image, ImageFile, PcxImagePlugin
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from .helper import assert_image_equal, hopper
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def _roundtrip(tmp_path, im):
f = str(tmp_path / "temp.pcx")
im.save(f)
with Image.open(f) as im2:
assert im2.mode == im.mode
assert im2.size == im.size
assert im2.format == "PCX"
assert im2.get_format_mimetype() == "image/x-pcx"
assert_image_equal(im2, im)
def test_sanity(tmp_path):
for mode in ("1", "L", "P", "RGB"):
_roundtrip(tmp_path, hopper(mode))
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# Test a palette with less than 256 colors
im = Image.new("P", (1, 1))
im.putpalette((255, 0, 0))
_roundtrip(tmp_path, im)
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# Test an unsupported mode
f = str(tmp_path / "temp.pcx")
im = hopper("RGBA")
with pytest.raises(ValueError):
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im.save(f)
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def test_invalid_file():
invalid_file = "Tests/images/flower.jpg"
with pytest.raises(SyntaxError):
PcxImagePlugin.PcxImageFile(invalid_file)
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@pytest.mark.parametrize("mode", ("1", "L", "P", "RGB"))
def test_odd(tmp_path, mode):
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# 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.
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# larger, odd sized images are better here to ensure that
# we handle interrupted scan lines properly.
_roundtrip(tmp_path, hopper(mode).resize((511, 511)))
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def test_odd_read():
# Reading an image with an odd stride, making it malformed
with Image.open("Tests/images/odd_stride.pcx") as im:
im.load()
assert im.size == (371, 150)
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def test_pil184():
# Check reading of files where xmin/xmax is not zero.
test_file = "Tests/images/pil184.pcx"
with Image.open(test_file) as im:
assert im.size == (447, 144)
assert im.tile[0][1] == (0, 0, 447, 144)
# Make sure all pixels are either 0 or 255.
assert im.histogram()[0] + im.histogram()[255] == 447 * 144
def test_1px_width(tmp_path):
im = Image.new("L", (1, 256))
px = im.load()
for y in range(256):
px[0, y] = y
_roundtrip(tmp_path, im)
def test_large_count(tmp_path):
im = Image.new("L", (256, 1))
px = im.load()
for x in range(256):
px[x, 0] = x // 67 * 67
_roundtrip(tmp_path, im)
def _test_buffer_overflow(tmp_path, im, size=1024):
_last = ImageFile.MAXBLOCK
ImageFile.MAXBLOCK = size
try:
_roundtrip(tmp_path, im)
finally:
ImageFile.MAXBLOCK = _last
def test_break_in_count_overflow(tmp_path):
im = Image.new("L", (256, 5))
px = im.load()
for y in range(4):
for x in range(256):
px[x, y] = x % 128
_test_buffer_overflow(tmp_path, im)
def test_break_one_in_loop(tmp_path):
im = Image.new("L", (256, 5))
px = im.load()
for y in range(5):
for x in range(256):
px[x, y] = x % 128
_test_buffer_overflow(tmp_path, im)
def test_break_many_in_loop(tmp_path):
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
_test_buffer_overflow(tmp_path, im)
def test_break_one_at_end(tmp_path):
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
_test_buffer_overflow(tmp_path, im)
def test_break_many_at_end(tmp_path):
im = Image.new("L", (256, 5))
px = im.load()
for y in range(5):
for x in range(256):
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px[x, y] = x % 128
for x in range(4):
px[x * 2, 3] = 128 + 64
px[x + 256 - 4, 3] = 0
_test_buffer_overflow(tmp_path, im)
def test_break_padding(tmp_path):
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
_test_buffer_overflow(tmp_path, im)