Pillow/Tests/test_imagefile.py
2020-04-20 19:27:09 +10:00

337 lines
10 KiB
Python

from io import BytesIO
import pytest
from PIL import EpsImagePlugin, Image, ImageFile, 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.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("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_ioerror(self):
with pytest.raises(IOError):
with pytest.warns(DeprecationWarning) as record:
ImageFile.raise_ioerror(1)
assert len(record) == 1
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()
@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
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 TestPyDecoder:
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()
assert d.state.xoff == xoff
assert d.state.yoff == yoff
assert d.state.xsize == xsize
assert d.state.ysize == ysize
with pytest.raises(ValueError):
d.set_as_raw(b"\x00")
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()
assert d.state.xoff == 0
assert d.state.yoff == 0
assert d.state.xsize == 200
assert d.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)]
self.get_decoder()
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)]
self.get_decoder()
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_no_format(self):
buf = BytesIO(b"\x00" * 255)
im = MockImageFile(buf)
assert im.format is None
assert im.get_format_mimetype() is None
def test_exif_jpeg(self, tmp_path):
with Image.open("Tests/images/exif-72dpi-int.jpg") as im: # Little endian
exif = im.getexif()
assert 258 not in exif
assert 40960 in exif
assert exif[40963] == 450
assert exif[11] == "gThumb 3.0.1"
out = str(tmp_path / "temp.jpg")
exif[258] = 8
del exif[40960]
exif[40963] = 455
exif[11] = "Pillow test"
im.save(out, exif=exif)
with Image.open(out) as reloaded:
reloaded_exif = reloaded.getexif()
assert reloaded_exif[258] == 8
assert 40960 not in exif
assert reloaded_exif[40963] == 455
assert exif[11] == "Pillow test"
with Image.open("Tests/images/no-dpi-in-exif.jpg") as im: # Big endian
exif = im.getexif()
assert 258 not in exif
assert 40962 in exif
assert exif[40963] == 200
assert exif[305] == "Adobe Photoshop CC 2017 (Macintosh)"
out = str(tmp_path / "temp.jpg")
exif[258] = 8
del exif[34665]
exif[40963] = 455
exif[305] = "Pillow test"
im.save(out, exif=exif)
with Image.open(out) as reloaded:
reloaded_exif = reloaded.getexif()
assert reloaded_exif[258] == 8
assert 40960 not in exif
assert reloaded_exif[40963] == 455
assert exif[305] == "Pillow test"
@skip_unless_feature("webp")
@skip_unless_feature("webp_anim")
def test_exif_webp(self, tmp_path):
with Image.open("Tests/images/hopper.webp") as im:
exif = im.getexif()
assert exif == {}
out = str(tmp_path / "temp.webp")
exif[258] = 8
exif[40963] = 455
exif[305] = "Pillow test"
def check_exif():
with Image.open(out) as reloaded:
reloaded_exif = reloaded.getexif()
assert reloaded_exif[258] == 8
assert reloaded_exif[40963] == 455
assert exif[305] == "Pillow test"
im.save(out, exif=exif)
check_exif()
im.save(out, exif=exif, save_all=True)
check_exif()
def test_exif_png(self, tmp_path):
with Image.open("Tests/images/exif.png") as im:
exif = im.getexif()
assert exif == {274: 1}
out = str(tmp_path / "temp.png")
exif[258] = 8
del exif[274]
exif[40963] = 455
exif[305] = "Pillow test"
im.save(out, exif=exif)
with Image.open(out) as reloaded:
reloaded_exif = reloaded.getexif()
assert reloaded_exif == {258: 8, 40963: 455, 305: "Pillow test"}
def test_exif_interop(self):
with Image.open("Tests/images/flower.jpg") as im:
exif = im.getexif()
assert exif.get_ifd(0xA005) == {
1: "R98",
2: b"0100",
4097: 2272,
4098: 1704,
}