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8.2.x
Pillow/Tests/test_file_apng.py
Eric Soroos 22e9bee4ef Fix DOS in PSDImagePlugin -- CVE-2021-28675 
* PSDImagePlugin did not sanity check the number of input layers and
  vs the size of the data block, this could lead to a DOS on
  Image.open prior to Image.load.
* This issue dates to the PIL fork
2021-04-01 17:17:31 +03:00

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import pytest
from PIL import Image, ImageSequence, PngImagePlugin
# APNG browser support tests and fixtures via:
# https://philip.html5.org/tests/apng/tests.html
# (referenced from https://wiki.mozilla.org/APNG_Specification)
def test_apng_basic():
with Image.open("Tests/images/apng/single_frame.png") as im:
assert not im.is_animated
assert im.n_frames == 1
assert im.get_format_mimetype() == "image/apng"
assert im.info.get("default_image") is None
assert im.getpixel((0, 0)) == (0, 255, 0, 255)
assert im.getpixel((64, 32)) == (0, 255, 0, 255)
with Image.open("Tests/images/apng/single_frame_default.png") as im:
assert im.is_animated
assert im.n_frames == 2
assert im.get_format_mimetype() == "image/apng"
assert im.info.get("default_image")
assert im.getpixel((0, 0)) == (255, 0, 0, 255)
assert im.getpixel((64, 32)) == (255, 0, 0, 255)
im.seek(1)
assert im.getpixel((0, 0)) == (0, 255, 0, 255)
assert im.getpixel((64, 32)) == (0, 255, 0, 255)
# test out of bounds seek
with pytest.raises(EOFError):
im.seek(2)
# test rewind support
im.seek(0)
assert im.getpixel((0, 0)) == (255, 0, 0, 255)
assert im.getpixel((64, 32)) == (255, 0, 0, 255)
im.seek(1)
assert im.getpixel((0, 0)) == (0, 255, 0, 255)
assert im.getpixel((64, 32)) == (0, 255, 0, 255)
def test_apng_fdat():
with Image.open("Tests/images/apng/split_fdat.png") as im:
im.seek(im.n_frames - 1)
assert im.getpixel((0, 0)) == (0, 255, 0, 255)
assert im.getpixel((64, 32)) == (0, 255, 0, 255)
with Image.open("Tests/images/apng/split_fdat_zero_chunk.png") as im:
im.seek(im.n_frames - 1)
assert im.getpixel((0, 0)) == (0, 255, 0, 255)
assert im.getpixel((64, 32)) == (0, 255, 0, 255)
def test_apng_dispose():
with Image.open("Tests/images/apng/dispose_op_none.png") as im:
im.seek(im.n_frames - 1)
assert im.getpixel((0, 0)) == (0, 255, 0, 255)
assert im.getpixel((64, 32)) == (0, 255, 0, 255)
with Image.open("Tests/images/apng/dispose_op_background.png") as im:
im.seek(im.n_frames - 1)
assert im.getpixel((0, 0)) == (0, 0, 0, 0)
assert im.getpixel((64, 32)) == (0, 0, 0, 0)
with Image.open("Tests/images/apng/dispose_op_background_final.png") as im:
im.seek(im.n_frames - 1)
assert im.getpixel((0, 0)) == (0, 255, 0, 255)
assert im.getpixel((64, 32)) == (0, 255, 0, 255)
with Image.open("Tests/images/apng/dispose_op_previous.png") as im:
im.seek(im.n_frames - 1)
assert im.getpixel((0, 0)) == (0, 255, 0, 255)
assert im.getpixel((64, 32)) == (0, 255, 0, 255)
with Image.open("Tests/images/apng/dispose_op_previous_final.png") as im:
im.seek(im.n_frames - 1)
assert im.getpixel((0, 0)) == (0, 255, 0, 255)
assert im.getpixel((64, 32)) == (0, 255, 0, 255)
with Image.open("Tests/images/apng/dispose_op_previous_first.png") as im:
im.seek(im.n_frames - 1)
assert im.getpixel((0, 0)) == (0, 0, 0, 0)
assert im.getpixel((64, 32)) == (0, 0, 0, 0)
def test_apng_dispose_region():
with Image.open("Tests/images/apng/dispose_op_none_region.png") as im:
im.seek(im.n_frames - 1)
assert im.getpixel((0, 0)) == (0, 255, 0, 255)
assert im.getpixel((64, 32)) == (0, 255, 0, 255)
with Image.open("Tests/images/apng/dispose_op_background_before_region.png") as im:
im.seek(im.n_frames - 1)
assert im.getpixel((0, 0)) == (0, 0, 0, 0)
assert im.getpixel((64, 32)) == (0, 0, 0, 0)
with Image.open("Tests/images/apng/dispose_op_background_region.png") as im:
im.seek(im.n_frames - 1)
assert im.getpixel((0, 0)) == (0, 0, 255, 255)
assert im.getpixel((64, 32)) == (0, 0, 0, 0)
with Image.open("Tests/images/apng/dispose_op_previous_region.png") as im:
im.seek(im.n_frames - 1)
assert im.getpixel((0, 0)) == (0, 255, 0, 255)
assert im.getpixel((64, 32)) == (0, 255, 0, 255)
def test_apng_dispose_op_previous_frame():
# Test that the dispose settings being used are from the previous frame
#
# Image created with:
# red = Image.new("RGBA", (128, 64), (255, 0, 0, 255))
# green = red.copy()
# green.paste(Image.new("RGBA", (64, 32), (0, 255, 0, 255)))
# blue = red.copy()
# blue.paste(Image.new("RGBA", (64, 32), (0, 255, 0, 255)), (64, 32))
#
# red.save(
# "Tests/images/apng/dispose_op_previous_frame.png",
# save_all=True,
# append_images=[green, blue],
# disposal=[
# PngImagePlugin.APNG_DISPOSE_OP_NONE,
# PngImagePlugin.APNG_DISPOSE_OP_PREVIOUS,
# PngImagePlugin.APNG_DISPOSE_OP_PREVIOUS
# ],
# )
with Image.open("Tests/images/apng/dispose_op_previous_frame.png") as im:
im.seek(im.n_frames - 1)
assert im.getpixel((0, 0)) == (255, 0, 0, 255)
def test_apng_dispose_op_background_p_mode():
with Image.open("Tests/images/apng/dispose_op_background_p_mode.png") as im:
im.seek(1)
im.load()
assert im.size == (128, 64)
def test_apng_blend():
with Image.open("Tests/images/apng/blend_op_source_solid.png") as im:
im.seek(im.n_frames - 1)
assert im.getpixel((0, 0)) == (0, 255, 0, 255)
assert im.getpixel((64, 32)) == (0, 255, 0, 255)
with Image.open("Tests/images/apng/blend_op_source_transparent.png") as im:
im.seek(im.n_frames - 1)
assert im.getpixel((0, 0)) == (0, 0, 0, 0)
assert im.getpixel((64, 32)) == (0, 0, 0, 0)
with Image.open("Tests/images/apng/blend_op_source_near_transparent.png") as im:
im.seek(im.n_frames - 1)
assert im.getpixel((0, 0)) == (0, 255, 0, 2)
assert im.getpixel((64, 32)) == (0, 255, 0, 2)
with Image.open("Tests/images/apng/blend_op_over.png") as im:
im.seek(im.n_frames - 1)
assert im.getpixel((0, 0)) == (0, 255, 0, 255)
assert im.getpixel((64, 32)) == (0, 255, 0, 255)
with Image.open("Tests/images/apng/blend_op_over_near_transparent.png") as im:
im.seek(im.n_frames - 1)
assert im.getpixel((0, 0)) == (0, 255, 0, 97)
assert im.getpixel((64, 32)) == (0, 255, 0, 255)
def test_apng_chunk_order():
with Image.open("Tests/images/apng/fctl_actl.png") as im:
im.seek(im.n_frames - 1)
assert im.getpixel((0, 0)) == (0, 255, 0, 255)
assert im.getpixel((64, 32)) == (0, 255, 0, 255)
def test_apng_delay():
with Image.open("Tests/images/apng/delay.png") as im:
im.seek(1)
assert im.info.get("duration") == 500.0
im.seek(2)
assert im.info.get("duration") == 1000.0
im.seek(3)
assert im.info.get("duration") == 500.0
im.seek(4)
assert im.info.get("duration") == 1000.0
with Image.open("Tests/images/apng/delay_round.png") as im:
im.seek(1)
assert im.info.get("duration") == 500.0
im.seek(2)
assert im.info.get("duration") == 1000.0
with Image.open("Tests/images/apng/delay_short_max.png") as im:
im.seek(1)
assert im.info.get("duration") == 500.0
im.seek(2)
assert im.info.get("duration") == 1000.0
with Image.open("Tests/images/apng/delay_zero_denom.png") as im:
im.seek(1)
assert im.info.get("duration") == 500.0
im.seek(2)
assert im.info.get("duration") == 1000.0
with Image.open("Tests/images/apng/delay_zero_numer.png") as im:
im.seek(1)
assert im.info.get("duration") == 0.0
im.seek(2)
assert im.info.get("duration") == 0.0
im.seek(3)
assert im.info.get("duration") == 500.0
im.seek(4)
assert im.info.get("duration") == 1000.0
def test_apng_num_plays():
with Image.open("Tests/images/apng/num_plays.png") as im:
assert im.info.get("loop") == 0
with Image.open("Tests/images/apng/num_plays_1.png") as im:
assert im.info.get("loop") == 1
def test_apng_mode():
with Image.open("Tests/images/apng/mode_16bit.png") as im:
assert im.mode == "RGBA"
im.seek(im.n_frames - 1)
assert im.getpixel((0, 0)) == (0, 0, 128, 191)
assert im.getpixel((64, 32)) == (0, 0, 128, 191)
with Image.open("Tests/images/apng/mode_greyscale.png") as im:
assert im.mode == "L"
im.seek(im.n_frames - 1)
assert im.getpixel((0, 0)) == 128
assert im.getpixel((64, 32)) == 255
with Image.open("Tests/images/apng/mode_greyscale_alpha.png") as im:
assert im.mode == "LA"
im.seek(im.n_frames - 1)
assert im.getpixel((0, 0)) == (128, 191)
assert im.getpixel((64, 32)) == (128, 191)
with Image.open("Tests/images/apng/mode_palette.png") as im:
assert im.mode == "P"
im.seek(im.n_frames - 1)
im = im.convert("RGB")
assert im.getpixel((0, 0)) == (0, 255, 0)
assert im.getpixel((64, 32)) == (0, 255, 0)
with Image.open("Tests/images/apng/mode_palette_alpha.png") as im:
assert im.mode == "P"
im.seek(im.n_frames - 1)
im = im.convert("RGBA")
assert im.getpixel((0, 0)) == (0, 255, 0, 255)
assert im.getpixel((64, 32)) == (0, 255, 0, 255)
with Image.open("Tests/images/apng/mode_palette_1bit_alpha.png") as im:
assert im.mode == "P"
im.seek(im.n_frames - 1)
im = im.convert("RGBA")
assert im.getpixel((0, 0)) == (0, 0, 255, 128)
assert im.getpixel((64, 32)) == (0, 0, 255, 128)
def test_apng_chunk_errors():
with Image.open("Tests/images/apng/chunk_no_actl.png") as im:
assert not im.is_animated
def open():
with Image.open("Tests/images/apng/chunk_multi_actl.png") as im:
im.load()
assert not im.is_animated
pytest.warns(UserWarning, open)
with Image.open("Tests/images/apng/chunk_actl_after_idat.png") as im:
assert not im.is_animated
with Image.open("Tests/images/apng/chunk_no_fctl.png") as im:
with pytest.raises(SyntaxError):
im.seek(im.n_frames - 1)
with Image.open("Tests/images/apng/chunk_repeat_fctl.png") as im:
with pytest.raises(SyntaxError):
im.seek(im.n_frames - 1)
with Image.open("Tests/images/apng/chunk_no_fdat.png") as im:
with pytest.raises(SyntaxError):
im.seek(im.n_frames - 1)
def test_apng_syntax_errors():
def open_frames_zero():
with Image.open("Tests/images/apng/syntax_num_frames_zero.png") as im:
assert not im.is_animated
with pytest.raises(OSError):
im.load()
pytest.warns(UserWarning, open_frames_zero)
def open_frames_zero_default():
with Image.open("Tests/images/apng/syntax_num_frames_zero_default.png") as im:
assert not im.is_animated
im.load()
pytest.warns(UserWarning, open_frames_zero_default)
# we can handle this case gracefully
exception = None
with Image.open("Tests/images/apng/syntax_num_frames_low.png") as im:
try:
im.seek(im.n_frames - 1)
except Exception as e:
exception = e
assert exception is None
with pytest.raises(OSError):
with Image.open("Tests/images/apng/syntax_num_frames_high.png") as im:
im.seek(im.n_frames - 1)
im.load()
def open():
with Image.open("Tests/images/apng/syntax_num_frames_invalid.png") as im:
assert not im.is_animated
im.load()
pytest.warns(UserWarning, open)
def test_apng_sequence_errors():
test_files = [
"sequence_start.png",
"sequence_gap.png",
"sequence_repeat.png",
"sequence_repeat_chunk.png",
"sequence_reorder.png",
"sequence_reorder_chunk.png",
"sequence_fdat_fctl.png",
]
for f in test_files:
with pytest.raises(SyntaxError):
with Image.open(f"Tests/images/apng/{f}") as im:
im.seek(im.n_frames - 1)
im.load()
def test_apng_save(tmp_path):
with Image.open("Tests/images/apng/single_frame.png") as im:
test_file = str(tmp_path / "temp.png")
im.save(test_file, save_all=True)
with Image.open(test_file) as im:
im.load()
assert not im.is_animated
assert im.n_frames == 1
assert im.get_format_mimetype() == "image/apng"
assert im.info.get("default_image") is None
assert im.getpixel((0, 0)) == (0, 255, 0, 255)
assert im.getpixel((64, 32)) == (0, 255, 0, 255)
with Image.open("Tests/images/apng/single_frame_default.png") as im:
frames = []
for frame_im in ImageSequence.Iterator(im):
frames.append(frame_im.copy())
frames[0].save(
test_file, save_all=True, default_image=True, append_images=frames[1:]
)
with Image.open(test_file) as im:
im.load()
assert im.is_animated
assert im.n_frames == 2
assert im.get_format_mimetype() == "image/apng"
assert im.info.get("default_image")
im.seek(1)
assert im.getpixel((0, 0)) == (0, 255, 0, 255)
assert im.getpixel((64, 32)) == (0, 255, 0, 255)
def test_apng_save_split_fdat(tmp_path):
# test to make sure we do not generate sequence errors when writing
# frames with image data spanning multiple fdAT chunks (in this case
# both the default image and first animation frame will span multiple
# data chunks)
test_file = str(tmp_path / "temp.png")
with Image.open("Tests/images/old-style-jpeg-compression.png") as im:
frames = [im.copy(), Image.new("RGBA", im.size, (255, 0, 0, 255))]
im.save(
test_file,
save_all=True,
default_image=True,
append_images=frames,
)
with Image.open(test_file) as im:
exception = None
try:
im.seek(im.n_frames - 1)
im.load()
except Exception as e:
exception = e
assert exception is None
def test_apng_save_duration_loop(tmp_path):
test_file = str(tmp_path / "temp.png")
with Image.open("Tests/images/apng/delay.png") as im:
frames = []
durations = []
loop = im.info.get("loop")
default_image = im.info.get("default_image")
for i, frame_im in enumerate(ImageSequence.Iterator(im)):
frames.append(frame_im.copy())
if i != 0 or not default_image:
durations.append(frame_im.info.get("duration", 0))
frames[0].save(
test_file,
save_all=True,
default_image=default_image,
append_images=frames[1:],
duration=durations,
loop=loop,
)
with Image.open(test_file) as im:
im.load()
assert im.info.get("loop") == loop
im.seek(1)
assert im.info.get("duration") == 500.0
im.seek(2)
assert im.info.get("duration") == 1000.0
im.seek(3)
assert im.info.get("duration") == 500.0
im.seek(4)
assert im.info.get("duration") == 1000.0
# test removal of duplicated frames
frame = Image.new("RGBA", (128, 64), (255, 0, 0, 255))
frame.save(test_file, save_all=True, append_images=[frame], duration=[500, 250])
with Image.open(test_file) as im:
im.load()
assert im.n_frames == 1
assert im.info.get("duration") == 750
def test_apng_save_disposal(tmp_path):
test_file = str(tmp_path / "temp.png")
size = (128, 64)
red = Image.new("RGBA", size, (255, 0, 0, 255))
green = Image.new("RGBA", size, (0, 255, 0, 255))
transparent = Image.new("RGBA", size, (0, 0, 0, 0))
# test APNG_DISPOSE_OP_NONE
red.save(
test_file,
save_all=True,
append_images=[green, transparent],
disposal=PngImagePlugin.APNG_DISPOSE_OP_NONE,
blend=PngImagePlugin.APNG_BLEND_OP_OVER,
)
with Image.open(test_file) as im:
im.seek(2)
assert im.getpixel((0, 0)) == (0, 255, 0, 255)
assert im.getpixel((64, 32)) == (0, 255, 0, 255)
# test APNG_DISPOSE_OP_BACKGROUND
disposal = [
PngImagePlugin.APNG_DISPOSE_OP_NONE,
PngImagePlugin.APNG_DISPOSE_OP_BACKGROUND,
PngImagePlugin.APNG_DISPOSE_OP_NONE,
]
red.save(
test_file,
save_all=True,
append_images=[red, transparent],
disposal=disposal,
blend=PngImagePlugin.APNG_BLEND_OP_OVER,
)
with Image.open(test_file) as im:
im.seek(2)
assert im.getpixel((0, 0)) == (0, 0, 0, 0)
assert im.getpixel((64, 32)) == (0, 0, 0, 0)
disposal = [
PngImagePlugin.APNG_DISPOSE_OP_NONE,
PngImagePlugin.APNG_DISPOSE_OP_BACKGROUND,
]
red.save(
test_file,
save_all=True,
append_images=[green],
disposal=disposal,
blend=PngImagePlugin.APNG_BLEND_OP_OVER,
)
with Image.open(test_file) as im:
im.seek(1)
assert im.getpixel((0, 0)) == (0, 255, 0, 255)
assert im.getpixel((64, 32)) == (0, 255, 0, 255)
# test APNG_DISPOSE_OP_PREVIOUS
disposal = [
PngImagePlugin.APNG_DISPOSE_OP_NONE,
PngImagePlugin.APNG_DISPOSE_OP_PREVIOUS,
PngImagePlugin.APNG_DISPOSE_OP_NONE,
]
red.save(
test_file,
save_all=True,
append_images=[green, red, transparent],
default_image=True,
disposal=disposal,
blend=PngImagePlugin.APNG_BLEND_OP_OVER,
)
with Image.open(test_file) as im:
im.seek(3)
assert im.getpixel((0, 0)) == (0, 255, 0, 255)
assert im.getpixel((64, 32)) == (0, 255, 0, 255)
disposal = [
PngImagePlugin.APNG_DISPOSE_OP_NONE,
PngImagePlugin.APNG_DISPOSE_OP_PREVIOUS,
]
red.save(
test_file,
save_all=True,
append_images=[green],
disposal=disposal,
blend=PngImagePlugin.APNG_BLEND_OP_OVER,
)
with Image.open(test_file) as im:
im.seek(1)
assert im.getpixel((0, 0)) == (0, 255, 0, 255)
assert im.getpixel((64, 32)) == (0, 255, 0, 255)
def test_apng_save_disposal_previous(tmp_path):
test_file = str(tmp_path / "temp.png")
size = (128, 64)
transparent = Image.new("RGBA", size, (0, 0, 0, 0))
red = Image.new("RGBA", size, (255, 0, 0, 255))
green = Image.new("RGBA", size, (0, 255, 0, 255))
# test APNG_DISPOSE_OP_NONE
transparent.save(
test_file,
save_all=True,
append_images=[red, green],
disposal=PngImagePlugin.APNG_DISPOSE_OP_PREVIOUS,
)
with Image.open(test_file) as im:
im.seek(2)
assert im.getpixel((0, 0)) == (0, 255, 0, 255)
assert im.getpixel((64, 32)) == (0, 255, 0, 255)
def test_apng_save_blend(tmp_path):
test_file = str(tmp_path / "temp.png")
size = (128, 64)
red = Image.new("RGBA", size, (255, 0, 0, 255))
green = Image.new("RGBA", size, (0, 255, 0, 255))
transparent = Image.new("RGBA", size, (0, 0, 0, 0))
# test APNG_BLEND_OP_SOURCE on solid color
blend = [
PngImagePlugin.APNG_BLEND_OP_OVER,
PngImagePlugin.APNG_BLEND_OP_SOURCE,
]
red.save(
test_file,
save_all=True,
append_images=[red, green],
default_image=True,
disposal=PngImagePlugin.APNG_DISPOSE_OP_NONE,
blend=blend,
)
with Image.open(test_file) as im:
im.seek(2)
assert im.getpixel((0, 0)) == (0, 255, 0, 255)
assert im.getpixel((64, 32)) == (0, 255, 0, 255)
# test APNG_BLEND_OP_SOURCE on transparent color
blend = [
PngImagePlugin.APNG_BLEND_OP_OVER,
PngImagePlugin.APNG_BLEND_OP_SOURCE,
]
red.save(
test_file,
save_all=True,
append_images=[red, transparent],
default_image=True,
disposal=PngImagePlugin.APNG_DISPOSE_OP_NONE,
blend=blend,
)
with Image.open(test_file) as im:
im.seek(2)
assert im.getpixel((0, 0)) == (0, 0, 0, 0)
assert im.getpixel((64, 32)) == (0, 0, 0, 0)
# test APNG_BLEND_OP_OVER
red.save(
test_file,
save_all=True,
append_images=[green, transparent],
default_image=True,
disposal=PngImagePlugin.APNG_DISPOSE_OP_NONE,
blend=PngImagePlugin.APNG_BLEND_OP_OVER,
)
with Image.open(test_file) as im:
im.seek(1)
assert im.getpixel((0, 0)) == (0, 255, 0, 255)
assert im.getpixel((64, 32)) == (0, 255, 0, 255)
im.seek(2)
assert im.getpixel((0, 0)) == (0, 255, 0, 255)
assert im.getpixel((64, 32)) == (0, 255, 0, 255)
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