import sys from io import BytesIO import pytest from PIL import Image, UnidentifiedImageError from .helper import assert_image_equal_tofile, assert_image_similar, hopper # sample ppm stream TEST_FILE = "Tests/images/hopper.ppm" def test_sanity(): with Image.open(TEST_FILE) as im: assert im.mode == "RGB" assert im.size == (128, 128) assert im.format == "PPM" assert im.get_format_mimetype() == "image/x-portable-pixmap" @pytest.mark.parametrize( "data, mode, pixels", ( (b"P5 3 1 4 \x00\x02\x04", "L", (0, 128, 255)), (b"P5 3 1 257 \x00\x00\x00\x80\x01\x01", "I", (0, 32640, 65535)), # P6 with maxval < 255 ( b"P6 3 1 17 \x00\x01\x02\x08\x09\x0A\x0F\x10\x11", "RGB", ( (0, 15, 30), (120, 135, 150), (225, 240, 255), ), ), # P6 with maxval > 255 # Scale down to 255, since there is no RGB mode with more than 8-bit ( b"P6 3 1 257 \x00\x00\x00\x01\x00\x02" b"\x00\x80\x00\x81\x00\x82\x01\x00\x01\x01\xFF\xFF", "RGB", ( (0, 1, 2), (127, 128, 129), (254, 255, 255), ), ), ), ) def test_arbitrary_maxval(data, mode, pixels): fp = BytesIO(data) with Image.open(fp) as im: assert im.size == (3, 1) assert im.mode == mode px = im.load() assert tuple(px[x, 0] for x in range(3)) == pixels def test_16bit_pgm(): with Image.open("Tests/images/16_bit_binary.pgm") as im: assert im.mode == "I" assert im.size == (20, 100) assert im.get_format_mimetype() == "image/x-portable-graymap" assert_image_equal_tofile(im, "Tests/images/16_bit_binary_pgm.png") def test_16bit_pgm_write(tmp_path): with Image.open("Tests/images/16_bit_binary.pgm") as im: f = str(tmp_path / "temp.pgm") im.save(f, "PPM") assert_image_equal_tofile(im, f) def test_pnm(tmp_path): with Image.open("Tests/images/hopper.pnm") as im: assert_image_similar(im, hopper(), 0.0001) f = str(tmp_path / "temp.pnm") im.save(f) assert_image_equal_tofile(im, f) def test_magic(tmp_path): path = str(tmp_path / "temp.ppm") with open(path, "wb") as f: f.write(b"PyInvalid") with pytest.raises(UnidentifiedImageError): with Image.open(path): pass def test_header_with_comments(tmp_path): path = str(tmp_path / "temp.ppm") with open(path, "wb") as f: f.write(b"P6 #comment\n#comment\r12#comment\r8\n128 #comment\n255\n") with Image.open(path) as im: assert im.size == (128, 128) def test_non_integer_token(tmp_path): path = str(tmp_path / "temp.ppm") with open(path, "wb") as f: f.write(b"P6\nTEST") with pytest.raises(ValueError): with Image.open(path): pass def test_token_too_long(tmp_path): path = str(tmp_path / "temp.ppm") with open(path, "wb") as f: f.write(b"P6\n 01234567890") with pytest.raises(ValueError) as e: with Image.open(path): pass assert str(e.value) == "Token too long in file header: 01234567890" def test_truncated_file(tmp_path): # Test EOF in header path = str(tmp_path / "temp.pgm") with open(path, "w") as f: f.write("P6") with pytest.raises(ValueError) as e: with Image.open(path): pass assert str(e.value) == "Reached EOF while reading header" # Test EOF for PyDecoder fp = BytesIO(b"P5 3 1 4") with Image.open(fp) as im: with pytest.raises(ValueError): im.load() @pytest.mark.parametrize("maxval", (0, 65536)) def test_invalid_maxval(maxval, tmp_path): path = str(tmp_path / "temp.ppm") with open(path, "w") as f: f.write("P6\n3 1 " + str(maxval)) with pytest.raises(ValueError) as e: with Image.open(path): pass assert str(e.value) == "maxval must be greater than 0 and less than 65536" def test_neg_ppm(): # Storage.c accepted negative values for xsize, ysize. the # internal open_ppm function didn't check for sanity but it # has been removed. The default opener doesn't accept negative # sizes. with pytest.raises(OSError): with Image.open("Tests/images/negative_size.ppm"): pass def test_mimetypes(tmp_path): path = str(tmp_path / "temp.pgm") with open(path, "w") as f: f.write("P4\n128 128\n255") with Image.open(path) as im: assert im.get_format_mimetype() == "image/x-portable-bitmap" with open(path, "w") as f: f.write("PyCMYK\n128 128\n255") with Image.open(path) as im: assert im.get_format_mimetype() == "image/x-portable-anymap" @pytest.mark.parametrize("buffer", (True, False)) def test_save_stdout(buffer): old_stdout = sys.stdout if buffer: class MyStdOut: buffer = BytesIO() mystdout = MyStdOut() else: mystdout = BytesIO() sys.stdout = mystdout with Image.open(TEST_FILE) as im: im.save(sys.stdout, "PPM") # Reset stdout sys.stdout = old_stdout if buffer: mystdout = mystdout.buffer with Image.open(mystdout) as reloaded: assert_image_equal_tofile(reloaded, TEST_FILE)