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test_imagefile.py
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test_imagefile.py
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from io import BytesIO
import pytest
from PIL import BmpImagePlugin, EpsImagePlugin, Image, ImageFile, _binary, features
from .helper import (
assert_image,
assert_image_equal,
assert_image_similar,
fromstring,
hopper,
skip_unless_feature,
tostring,
)
# save original block sizes
MAXBLOCK = ImageFile.MAXBLOCK
SAFEBLOCK = ImageFile.SAFEBLOCK
class TestImageFile:
def test_parser(self):
def roundtrip(format):
im = hopper("L").resize((1000, 1000), Image.Resampling.NEAREST)
if format in ("MSP", "XBM"):
im = im.convert("1")
test_file = BytesIO()
im.copy().save(test_file, format)
data = test_file.getvalue()
parser = ImageFile.Parser()
parser.feed(data)
imOut = parser.close()
return im, imOut
assert_image_equal(*roundtrip("BMP"))
im1, im2 = roundtrip("GIF")
assert_image_similar(im1.convert("P"), im2, 1)
assert_image_equal(*roundtrip("IM"))
assert_image_equal(*roundtrip("MSP"))
if features.check("zlib"):
try:
# force multiple blocks in PNG driver
ImageFile.MAXBLOCK = 8192
assert_image_equal(*roundtrip("PNG"))
finally:
ImageFile.MAXBLOCK = MAXBLOCK
assert_image_equal(*roundtrip("PPM"))
assert_image_equal(*roundtrip("TIFF"))
assert_image_equal(*roundtrip("XBM"))
assert_image_equal(*roundtrip("TGA"))
assert_image_equal(*roundtrip("PCX"))
if EpsImagePlugin.has_ghostscript():
im1, im2 = roundtrip("EPS")
# 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
# to that written on ubuntu 12.04 x64
# md5sum: ba974835ff2d6f3f2fd0053a23521d4a
# EPS comes back in RGB:
assert_image_similar(im1, im2.convert("L"), 20)
if features.check("jpg"):
im1, im2 = roundtrip("JPEG") # lossy compression
assert_image(im1, im2.mode, im2.size)
with pytest.raises(OSError):
roundtrip("PDF")
def test_ico(self):
with open("Tests/images/python.ico", "rb") as f:
data = f.read()
with ImageFile.Parser() as p:
p.feed(data)
assert (48, 48) == p.image.size
@skip_unless_feature("webp")
@skip_unless_feature("webp_anim")
def test_incremental_webp(self):
with ImageFile.Parser() as p:
with open("Tests/images/hopper.webp", "rb") as f:
p.feed(f.read(1024))
# Check that insufficient data was given in the first feed
assert not p.image
p.feed(f.read())
assert (128, 128) == p.image.size
@skip_unless_feature("zlib")
def test_safeblock(self):
im1 = hopper()
try:
ImageFile.SAFEBLOCK = 1
im2 = fromstring(tostring(im1, "PNG"))
finally:
ImageFile.SAFEBLOCK = SAFEBLOCK
assert_image_equal(im1, im2)
def test_raise_oserror(self):
with pytest.raises(OSError):
ImageFile.raise_oserror(1)
def test_raise_typeerror(self):
with pytest.raises(TypeError):
parser = ImageFile.Parser()
parser.feed(1)
def test_negative_stride(self):
with open("Tests/images/raw_negative_stride.bin", "rb") as f:
input = f.read()
p = ImageFile.Parser()
p.feed(input)
with pytest.raises(OSError):
p.close()
def test_no_format(self):
buf = BytesIO(b"\x00" * 255)
class DummyImageFile(ImageFile.ImageFile):
def _open(self):
self.mode = "RGB"
self._size = (1, 1)
im = DummyImageFile(buf)
assert im.format is None
assert im.get_format_mimetype() is None
def test_oserror(self):
im = Image.new("RGB", (1, 1))
with pytest.raises(OSError):
im.save(BytesIO(), "JPEG2000", num_resolutions=2)
def test_truncated(self):
b = BytesIO(
b"BM000000000000" # head_data
+ _binary.o32le(
ImageFile.SAFEBLOCK + 1 + 4
) # header_size, so BmpImagePlugin will try to read SAFEBLOCK + 1 bytes
+ (
b"0" * ImageFile.SAFEBLOCK
) # only SAFEBLOCK bytes, so that the header is truncated
)
with pytest.raises(OSError) as e:
BmpImagePlugin.BmpImageFile(b)
assert str(e.value) == "Truncated File Read"
@skip_unless_feature("zlib")
def test_truncated_with_errors(self):
with Image.open("Tests/images/truncated_image.png") as im:
with pytest.raises(OSError):
im.load()
# Test that the error is raised if loaded a second time
with pytest.raises(OSError):
im.load()
@skip_unless_feature("zlib")
def test_truncated_without_errors(self):
with Image.open("Tests/images/truncated_image.png") as im:
ImageFile.LOAD_TRUNCATED_IMAGES = True
try:
im.load()
finally:
ImageFile.LOAD_TRUNCATED_IMAGES = False
@skip_unless_feature("zlib")
def test_broken_datastream_with_errors(self):
with Image.open("Tests/images/broken_data_stream.png") as im:
with pytest.raises(OSError):
im.load()
@skip_unless_feature("zlib")
def test_broken_datastream_without_errors(self):
with Image.open("Tests/images/broken_data_stream.png") as im:
ImageFile.LOAD_TRUNCATED_IMAGES = True
try:
im.load()
finally:
ImageFile.LOAD_TRUNCATED_IMAGES = False
class MockPyDecoder(ImageFile.PyDecoder):
def decode(self, buffer):
# eof
return -1, 0
class MockPyEncoder(ImageFile.PyEncoder):
def encode(self, buffer):
return 1, 1, b""
xoff, yoff, xsize, ysize = 10, 20, 100, 100
class MockImageFile(ImageFile.ImageFile):
def _open(self):
self.rawmode = "RGBA"
self.mode = "RGBA"
self._size = (200, 200)
self.tile = [("MOCK", (xoff, yoff, xoff + xsize, yoff + ysize), 32, None)]
class CodecsTest:
@classmethod
def setup_class(cls):
cls.decoder = MockPyDecoder(None)
cls.encoder = MockPyEncoder(None)
def decoder_closure(mode, *args):
cls.decoder.__init__(mode, *args)
return cls.decoder
def encoder_closure(mode, *args):
cls.encoder.__init__(mode, *args)
return cls.encoder
Image.register_decoder("MOCK", decoder_closure)
Image.register_encoder("MOCK", encoder_closure)
class TestPyDecoder(CodecsTest):
def test_setimage(self):
buf = BytesIO(b"\x00" * 255)
im = MockImageFile(buf)
im.load()
assert self.decoder.state.xoff == xoff
assert self.decoder.state.yoff == yoff
assert self.decoder.state.xsize == xsize
assert self.decoder.state.ysize == ysize
with pytest.raises(ValueError):
self.decoder.set_as_raw(b"\x00")
def test_extents_none(self):
buf = BytesIO(b"\x00" * 255)
im = MockImageFile(buf)
im.tile = [("MOCK", None, 32, None)]
im.load()
assert self.decoder.state.xoff == 0
assert self.decoder.state.yoff == 0
assert self.decoder.state.xsize == 200
assert self.decoder.state.ysize == 200
def test_negsize(self):
buf = BytesIO(b"\x00" * 255)
im = MockImageFile(buf)
im.tile = [("MOCK", (xoff, yoff, -10, yoff + ysize), 32, None)]
with pytest.raises(ValueError):
im.load()
im.tile = [("MOCK", (xoff, yoff, xoff + xsize, -10), 32, None)]
with pytest.raises(ValueError):
im.load()
def test_oversize(self):
buf = BytesIO(b"\x00" * 255)
im = MockImageFile(buf)
im.tile = [("MOCK", (xoff, yoff, xoff + xsize + 100, yoff + ysize), 32, None)]
with pytest.raises(ValueError):
im.load()
im.tile = [("MOCK", (xoff, yoff, xoff + xsize, yoff + ysize + 100), 32, None)]
with pytest.raises(ValueError):
im.load()
def test_decode(self):
decoder = ImageFile.PyDecoder(None)
with pytest.raises(NotImplementedError):
decoder.decode(None)
class TestPyEncoder(CodecsTest):
def test_setimage(self):
buf = BytesIO(b"\x00" * 255)
im = MockImageFile(buf)
fp = BytesIO()
ImageFile._save(
im, fp, [("MOCK", (xoff, yoff, xoff + xsize, yoff + ysize), 0, "RGB")]
)
assert self.encoder.state.xoff == xoff
assert self.encoder.state.yoff == yoff
assert self.encoder.state.xsize == xsize
assert self.encoder.state.ysize == ysize
def test_extents_none(self):
buf = BytesIO(b"\x00" * 255)
im = MockImageFile(buf)
im.tile = [("MOCK", None, 32, None)]
fp = BytesIO()
ImageFile._save(im, fp, [("MOCK", None, 0, "RGB")])
assert self.encoder.state.xoff == 0
assert self.encoder.state.yoff == 0
assert self.encoder.state.xsize == 200
assert self.encoder.state.ysize == 200
def test_negsize(self):
buf = BytesIO(b"\x00" * 255)
im = MockImageFile(buf)
fp = BytesIO()
with pytest.raises(ValueError):
ImageFile._save(
im, fp, [("MOCK", (xoff, yoff, -10, yoff + ysize), 0, "RGB")]
)
with pytest.raises(ValueError):
ImageFile._save(
im, fp, [("MOCK", (xoff, yoff, xoff + xsize, -10), 0, "RGB")]
)
def test_oversize(self):
buf = BytesIO(b"\x00" * 255)
im = MockImageFile(buf)
fp = BytesIO()
with pytest.raises(ValueError):
ImageFile._save(
im,
fp,
[("MOCK", (xoff, yoff, xoff + xsize + 100, yoff + ysize), 0, "RGB")],
)
with pytest.raises(ValueError):
ImageFile._save(
im,
fp,
[("MOCK", (xoff, yoff, xoff + xsize, yoff + ysize + 100), 0, "RGB")],
)
def test_encode(self):
encoder = ImageFile.PyEncoder(None)
with pytest.raises(NotImplementedError):
encoder.encode(None)
bytes_consumed, errcode = encoder.encode_to_pyfd()
assert bytes_consumed == 0
assert ImageFile.ERRORS[errcode] == "bad configuration"
encoder._pushes_fd = True
with pytest.raises(NotImplementedError):
encoder.encode_to_pyfd()
with pytest.raises(NotImplementedError):
encoder.encode_to_file(None, None)