from __future__ import annotations from io import BytesIO from typing import Any import pytest from PIL import ( BmpImagePlugin, EpsImagePlugin, Image, ImageFile, UnidentifiedImageError, _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) -> None: def roundtrip(format: str) -> tuple[Image.Image, Image.Image]: 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) im_out = parser.close() return im, im_out 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) -> None: with open("Tests/images/python.ico", "rb") as f: data = f.read() with ImageFile.Parser() as p: p.feed(data) assert p.image is not None assert (48, 48) == p.image.size @skip_unless_feature("webp") def test_incremental_webp(self) -> None: 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 p.image is not None assert (128, 128) == p.image.size @skip_unless_feature("zlib") def test_safeblock(self) -> None: 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) -> None: with pytest.warns(DeprecationWarning): with pytest.raises(OSError): ImageFile.raise_oserror(1) def test_raise_typeerror(self) -> None: with pytest.raises(TypeError): parser = ImageFile.Parser() parser.feed(1) # type: ignore[arg-type] def test_negative_stride(self) -> None: 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) -> None: buf = BytesIO(b"\x00" * 255) class DummyImageFile(ImageFile.ImageFile): def _open(self) -> None: 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) -> None: im = Image.new("RGB", (1, 1)) with pytest.raises(OSError): im.save(BytesIO(), "JPEG2000", num_resolutions=2) def test_truncated(self) -> None: 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) -> None: 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) -> None: 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) -> None: 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) -> None: 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): last: MockPyDecoder def __init__(self, mode: str, *args: Any) -> None: MockPyDecoder.last = self super().__init__(mode, *args) def decode(self, buffer: bytes) -> tuple[int, int]: # eof return -1, 0 class MockPyEncoder(ImageFile.PyEncoder): last: MockPyEncoder | None def __init__(self, mode: str, *args: Any) -> None: MockPyEncoder.last = self super().__init__(mode, *args) def encode(self, bufsize: int) -> tuple[int, int, bytes]: return 1, 1, b"" def cleanup(self) -> None: self.cleanup_called = True xoff, yoff, xsize, ysize = 10, 20, 100, 100 class MockImageFile(ImageFile.ImageFile): def _open(self) -> None: 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) -> None: Image.register_decoder("MOCK", MockPyDecoder) Image.register_encoder("MOCK", MockPyEncoder) class TestPyDecoder(CodecsTest): def test_setimage(self) -> None: buf = BytesIO(b"\x00" * 255) im = MockImageFile(buf) im.load() assert MockPyDecoder.last.state.xoff == xoff assert MockPyDecoder.last.state.yoff == yoff assert MockPyDecoder.last.state.xsize == xsize assert MockPyDecoder.last.state.ysize == ysize with pytest.raises(ValueError): MockPyDecoder.last.set_as_raw(b"\x00") def test_extents_none(self) -> None: buf = BytesIO(b"\x00" * 255) im = MockImageFile(buf) im.tile = [("MOCK", None, 32, None)] im.load() assert MockPyDecoder.last.state.xoff == 0 assert MockPyDecoder.last.state.yoff == 0 assert MockPyDecoder.last.state.xsize == 200 assert MockPyDecoder.last.state.ysize == 200 def test_negsize(self) -> None: 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) -> None: 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) -> None: decoder = ImageFile.PyDecoder("") with pytest.raises(NotImplementedError): decoder.decode(b"") class TestPyEncoder(CodecsTest): def test_setimage(self) -> None: buf = BytesIO(b"\x00" * 255) im = MockImageFile(buf) fp = BytesIO() ImageFile._save( im, fp, [ ImageFile._Tile( "MOCK", (xoff, yoff, xoff + xsize, yoff + ysize), 0, "RGB" ) ], ) assert MockPyEncoder.last assert MockPyEncoder.last.state.xoff == xoff assert MockPyEncoder.last.state.yoff == yoff assert MockPyEncoder.last.state.xsize == xsize assert MockPyEncoder.last.state.ysize == ysize def test_extents_none(self) -> None: buf = BytesIO(b"\x00" * 255) im = MockImageFile(buf) im.tile = [("MOCK", None, 32, None)] fp = BytesIO() ImageFile._save(im, fp, [ImageFile._Tile("MOCK", None, 0, "RGB")]) assert MockPyEncoder.last assert MockPyEncoder.last.state.xoff == 0 assert MockPyEncoder.last.state.yoff == 0 assert MockPyEncoder.last.state.xsize == 200 assert MockPyEncoder.last.state.ysize == 200 def test_negsize(self) -> None: buf = BytesIO(b"\x00" * 255) im = MockImageFile(buf) fp = BytesIO() MockPyEncoder.last = None with pytest.raises(ValueError): ImageFile._save( im, fp, [ImageFile._Tile("MOCK", (xoff, yoff, -10, yoff + ysize), 0, "RGB")], ) last: MockPyEncoder | None = MockPyEncoder.last assert last assert last.cleanup_called with pytest.raises(ValueError): ImageFile._save( im, fp, [ImageFile._Tile("MOCK", (xoff, yoff, xoff + xsize, -10), 0, "RGB")], ) def test_oversize(self) -> None: buf = BytesIO(b"\x00" * 255) im = MockImageFile(buf) fp = BytesIO() with pytest.raises(ValueError): ImageFile._save( im, fp, [ ImageFile._Tile( "MOCK", (xoff, yoff, xoff + xsize + 100, yoff + ysize), 0, "RGB" ) ], ) with pytest.raises(ValueError): ImageFile._save( im, fp, [ ImageFile._Tile( "MOCK", (xoff, yoff, xoff + xsize, yoff + ysize + 100), 0, "RGB" ) ], ) def test_encode(self) -> None: encoder = ImageFile.PyEncoder("") with pytest.raises(NotImplementedError): encoder.encode(0) 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() fh = BytesIO() with pytest.raises(NotImplementedError): encoder.encode_to_file(fh, 0) def test_zero_height(self) -> None: with pytest.raises(UnidentifiedImageError): Image.open("Tests/images/zero_height.j2k")