from helper import unittest, PillowTestCase, hopper from io import BytesIO from PIL import Image from PIL import ImageFile from PIL import PngImagePlugin import zlib codecs = dir(Image.core) # sample png stream TEST_PNG_FILE = "Tests/images/hopper.png" # stuff to create inline PNG images MAGIC = PngImagePlugin._MAGIC def chunk(cid, *data): test_file = BytesIO() PngImagePlugin.putchunk(*(test_file, cid) + data) return test_file.getvalue() o32 = PngImagePlugin.o32 IHDR = chunk(b"IHDR", o32(1), o32(1), b'\x08\x02', b'\0\0\0') IDAT = chunk(b"IDAT") IEND = chunk(b"IEND") HEAD = MAGIC + IHDR TAIL = IDAT + IEND def load(data): return Image.open(BytesIO(data)) def roundtrip(im, **options): out = BytesIO() im.save(out, "PNG", **options) out.seek(0) return Image.open(out) class TestFilePng(PillowTestCase): def setUp(self): if "zip_encoder" not in codecs or "zip_decoder" not in codecs: self.skipTest("zip/deflate support not available") def test_sanity(self): # internal version number self.assertRegexpMatches( Image.core.zlib_version, r"\d+\.\d+\.\d+(\.\d+)?$") test_file = self.tempfile("temp.png") hopper("RGB").save(test_file) im = Image.open(test_file) im.load() self.assertEqual(im.mode, "RGB") self.assertEqual(im.size, (128, 128)) self.assertEqual(im.format, "PNG") hopper("1").save(test_file) im = Image.open(test_file) hopper("L").save(test_file) im = Image.open(test_file) hopper("P").save(test_file) im = Image.open(test_file) hopper("RGB").save(test_file) im = Image.open(test_file) hopper("I").save(test_file) im = Image.open(test_file) def test_invalid_file(self): invalid_file = "Tests/images/flower.jpg" self.assertRaises(SyntaxError, lambda: PngImagePlugin.PngImageFile(invalid_file)) def test_broken(self): # Check reading of totally broken files. In this case, the test # file was checked into Subversion as a text file. test_file = "Tests/images/broken.png" self.assertRaises(IOError, lambda: Image.open(test_file)) def test_bad_text(self): # Make sure PIL can read malformed tEXt chunks (@PIL152) im = load(HEAD + chunk(b'tEXt') + TAIL) self.assertEqual(im.info, {}) im = load(HEAD + chunk(b'tEXt', b'spam') + TAIL) self.assertEqual(im.info, {'spam': ''}) im = load(HEAD + chunk(b'tEXt', b'spam\0') + TAIL) self.assertEqual(im.info, {'spam': ''}) im = load(HEAD + chunk(b'tEXt', b'spam\0egg') + TAIL) self.assertEqual(im.info, {'spam': 'egg'}) im = load(HEAD + chunk(b'tEXt', b'spam\0egg\0') + TAIL) self.assertEqual(im.info, {'spam': 'egg\x00'}) def test_bad_ztxt(self): # Test reading malformed zTXt chunks (python-pillow/Pillow#318) im = load(HEAD + chunk(b'zTXt') + TAIL) self.assertEqual(im.info, {}) im = load(HEAD + chunk(b'zTXt', b'spam') + TAIL) self.assertEqual(im.info, {'spam': ''}) im = load(HEAD + chunk(b'zTXt', b'spam\0') + TAIL) self.assertEqual(im.info, {'spam': ''}) im = load(HEAD + chunk(b'zTXt', b'spam\0\0') + TAIL) self.assertEqual(im.info, {'spam': ''}) im = load(HEAD + chunk( b'zTXt', b'spam\0\0' + zlib.compress(b'egg')[:1]) + TAIL) self.assertEqual(im.info, {'spam': ''}) im = load( HEAD + chunk(b'zTXt', b'spam\0\0' + zlib.compress(b'egg')) + TAIL) self.assertEqual(im.info, {'spam': 'egg'}) def test_bad_itxt(self): im = load(HEAD + chunk(b'iTXt') + TAIL) self.assertEqual(im.info, {}) im = load(HEAD + chunk(b'iTXt', b'spam') + TAIL) self.assertEqual(im.info, {}) im = load(HEAD + chunk(b'iTXt', b'spam\0') + TAIL) self.assertEqual(im.info, {}) im = load(HEAD + chunk(b'iTXt', b'spam\0\x02') + TAIL) self.assertEqual(im.info, {}) im = load(HEAD + chunk(b'iTXt', b'spam\0\0\0foo\0') + TAIL) self.assertEqual(im.info, {}) im = load(HEAD + chunk(b'iTXt', b'spam\0\0\0en\0Spam\0egg') + TAIL) self.assertEqual(im.info, {"spam": "egg"}) self.assertEqual(im.info["spam"].lang, "en") self.assertEqual(im.info["spam"].tkey, "Spam") im = load(HEAD + chunk(b'iTXt', b'spam\0\1\0en\0Spam\0' + zlib.compress(b"egg")[:1]) + TAIL) self.assertEqual(im.info, {'spam': ''}) im = load(HEAD + chunk(b'iTXt', b'spam\0\1\1en\0Spam\0' + zlib.compress(b"egg")) + TAIL) self.assertEqual(im.info, {}) im = load(HEAD + chunk(b'iTXt', b'spam\0\1\0en\0Spam\0' + zlib.compress(b"egg")) + TAIL) self.assertEqual(im.info, {"spam": "egg"}) self.assertEqual(im.info["spam"].lang, "en") self.assertEqual(im.info["spam"].tkey, "Spam") def test_interlace(self): test_file = "Tests/images/pil123p.png" im = Image.open(test_file) self.assert_image(im, "P", (162, 150)) self.assertTrue(im.info.get("interlace")) im.load() test_file = "Tests/images/pil123rgba.png" im = Image.open(test_file) self.assert_image(im, "RGBA", (162, 150)) self.assertTrue(im.info.get("interlace")) im.load() def test_load_transparent_p(self): test_file = "Tests/images/pil123p.png" im = Image.open(test_file) self.assert_image(im, "P", (162, 150)) im = im.convert("RGBA") self.assert_image(im, "RGBA", (162, 150)) # image has 124 unique alpha values self.assertEqual(len(im.split()[3].getcolors()), 124) def test_load_transparent_rgb(self): test_file = "Tests/images/rgb_trns.png" im = Image.open(test_file) self.assertEqual(im.info["transparency"], (0, 255, 52)) self.assert_image(im, "RGB", (64, 64)) im = im.convert("RGBA") self.assert_image(im, "RGBA", (64, 64)) # image has 876 transparent pixels self.assertEqual(im.split()[3].getcolors()[0][0], 876) def test_save_p_transparent_palette(self): in_file = "Tests/images/pil123p.png" im = Image.open(in_file) # 'transparency' contains a byte string with the opacity for # each palette entry self.assertEqual(len(im.info["transparency"]), 256) test_file = self.tempfile("temp.png") im.save(test_file) # check if saved image contains same transparency im = Image.open(test_file) self.assertEqual(len(im.info["transparency"]), 256) self.assert_image(im, "P", (162, 150)) im = im.convert("RGBA") self.assert_image(im, "RGBA", (162, 150)) # image has 124 unique alpha values self.assertEqual(len(im.split()[3].getcolors()), 124) def test_save_p_single_transparency(self): in_file = "Tests/images/p_trns_single.png" im = Image.open(in_file) # pixel value 164 is full transparent self.assertEqual(im.info["transparency"], 164) self.assertEqual(im.getpixel((31, 31)), 164) test_file = self.tempfile("temp.png") im.save(test_file) # check if saved image contains same transparency im = Image.open(test_file) self.assertEqual(im.info["transparency"], 164) self.assertEqual(im.getpixel((31, 31)), 164) self.assert_image(im, "P", (64, 64)) im = im.convert("RGBA") self.assert_image(im, "RGBA", (64, 64)) self.assertEqual(im.getpixel((31, 31)), (0, 255, 52, 0)) # image has 876 transparent pixels self.assertEqual(im.split()[3].getcolors()[0][0], 876) def test_save_p_transparent_black(self): # check if solid black image with full transparency # is supported (check for #1838) im = Image.new("RGBA", (10, 10), (0, 0, 0, 0)) self.assertEqual(im.getcolors(), [(100, (0, 0, 0, 0))]) im = im.convert("P") test_file = self.tempfile("temp.png") im.save(test_file) # check if saved image contains same transparency im = Image.open(test_file) self.assertEqual(len(im.info["transparency"]), 256) self.assert_image(im, "P", (10, 10)) im = im.convert("RGBA") self.assert_image(im, "RGBA", (10, 10)) self.assertEqual(im.getcolors(), [(100, (0, 0, 0, 0))]) def test_save_l_transparency(self): in_file = "Tests/images/l_trns.png" im = Image.open(in_file) test_file = self.tempfile("temp.png") im.save(test_file) # There are 559 transparent pixels. im = im.convert('RGBA') self.assertEqual(im.split()[3].getcolors()[0][0], 559) def test_save_rgb_single_transparency(self): in_file = "Tests/images/caption_6_33_22.png" im = Image.open(in_file) test_file = self.tempfile("temp.png") im.save(test_file) def test_load_verify(self): # Check open/load/verify exception (@PIL150) im = Image.open(TEST_PNG_FILE) im.verify() im = Image.open(TEST_PNG_FILE) im.load() self.assertRaises(RuntimeError, im.verify) def test_verify_struct_error(self): # Check open/load/verify exception (#1755) # offsets to test, -10: breaks in i32() in read. (IOError) # -13: breaks in crc, txt chunk. # -14: malformed chunk for offset in (-10, -13, -14): with open(TEST_PNG_FILE, 'rb') as f: test_file = f.read()[:offset] im = Image.open(BytesIO(test_file)) self.assertTrue(im.fp is not None) self.assertRaises((IOError, SyntaxError), im.verify) def test_verify_ignores_crc_error(self): # check ignores crc errors in ancillary chunks chunk_data = chunk(b'tEXt', b'spam') broken_crc_chunk_data = chunk_data[:-1] + b'q' # break CRC image_data = HEAD + broken_crc_chunk_data + TAIL self.assertRaises(SyntaxError, PngImagePlugin.PngImageFile, BytesIO(image_data)) ImageFile.LOAD_TRUNCATED_IMAGES = True try: im = load(image_data) self.assertTrue(im is not None) finally: ImageFile.LOAD_TRUNCATED_IMAGES = False def test_verify_not_ignores_crc_error_in_required_chunk(self): # check does not ignore crc errors in required chunks image_data = MAGIC + IHDR[:-1] + b'q' + TAIL ImageFile.LOAD_TRUNCATED_IMAGES = True try: self.assertRaises(SyntaxError, PngImagePlugin.PngImageFile, BytesIO(image_data)) finally: ImageFile.LOAD_TRUNCATED_IMAGES = False def test_roundtrip_dpi(self): # Check dpi roundtripping im = Image.open(TEST_PNG_FILE) im = roundtrip(im, dpi=(100, 100)) self.assertEqual(im.info["dpi"], (100, 100)) def test_roundtrip_text(self): # Check text roundtripping im = Image.open(TEST_PNG_FILE) info = PngImagePlugin.PngInfo() info.add_text("TXT", "VALUE") info.add_text("ZIP", "VALUE", 1) im = roundtrip(im, pnginfo=info) self.assertEqual(im.info, {'TXT': 'VALUE', 'ZIP': 'VALUE'}) self.assertEqual(im.text, {'TXT': 'VALUE', 'ZIP': 'VALUE'}) def test_roundtrip_itxt(self): # Check iTXt roundtripping im = Image.new("RGB", (32, 32)) info = PngImagePlugin.PngInfo() info.add_itxt("spam", "Eggs", "en", "Spam") info.add_text("eggs", PngImagePlugin.iTXt("Spam", "en", "Eggs"), zip=True) im = roundtrip(im, pnginfo=info) self.assertEqual(im.info, {"spam": "Eggs", "eggs": "Spam"}) self.assertEqual(im.text, {"spam": "Eggs", "eggs": "Spam"}) self.assertEqual(im.text["spam"].lang, "en") self.assertEqual(im.text["spam"].tkey, "Spam") self.assertEqual(im.text["eggs"].lang, "en") self.assertEqual(im.text["eggs"].tkey, "Eggs") def test_nonunicode_text(self): # Check so that non-Unicode text is saved as a tEXt rather than iTXt im = Image.new("RGB", (32, 32)) info = PngImagePlugin.PngInfo() info.add_text("Text", "Ascii") im = roundtrip(im, pnginfo=info) self.assertIsInstance(im.info["Text"], str) def test_unicode_text(self): # Check preservation of non-ASCII characters on Python 3 # This cannot really be meaningfully tested on Python 2, # since it didn't preserve charsets to begin with. def rt_text(value): im = Image.new("RGB", (32, 32)) info = PngImagePlugin.PngInfo() info.add_text("Text", value) im = roundtrip(im, pnginfo=info) self.assertEqual(im.info, {"Text": value}) if str is not bytes: rt_text(" Aa" + chr(0xa0) + chr(0xc4) + chr(0xff)) # Latin1 rt_text(chr(0x400) + chr(0x472) + chr(0x4ff)) # Cyrillic rt_text(chr(0x4e00) + chr(0x66f0) + # CJK chr(0x9fba) + chr(0x3042) + chr(0xac00)) rt_text("A" + chr(0xc4) + chr(0x472) + chr(0x3042)) # Combined def test_scary(self): # Check reading of evil PNG file. For information, see: # http://scary.beasts.org/security/CESA-2004-001.txt # The first byte is removed from pngtest_bad.png # to avoid classification as malware. with open("Tests/images/pngtest_bad.png.bin", 'rb') as fd: data = b'\x89' + fd.read() pngfile = BytesIO(data) self.assertRaises(IOError, lambda: Image.open(pngfile)) def test_trns_rgb(self): # Check writing and reading of tRNS chunks for RGB images. # Independent file sample provided by Sebastian Spaeth. test_file = "Tests/images/caption_6_33_22.png" im = Image.open(test_file) self.assertEqual(im.info["transparency"], (248, 248, 248)) # check saving transparency by default im = roundtrip(im) self.assertEqual(im.info["transparency"], (248, 248, 248)) im = roundtrip(im, transparency=(0, 1, 2)) self.assertEqual(im.info["transparency"], (0, 1, 2)) def test_trns_p(self): # Check writing a transparency of 0, issue #528 im = hopper('P') im.info['transparency'] = 0 f = self.tempfile("temp.png") im.save(f) im2 = Image.open(f) self.assertIn('transparency', im2.info) self.assert_image_equal(im2.convert('RGBA'), im.convert('RGBA')) def test_trns_null(self): # Check reading images with null tRNS value, issue #1239 test_file = "Tests/images/tRNS_null_1x1.png" im = Image.open(test_file) self.assertEqual(im.info["transparency"], 0) def test_save_icc_profile(self): im = Image.open("Tests/images/icc_profile_none.png") self.assertEqual(im.info['icc_profile'], None) with_icc = Image.open("Tests/images/icc_profile.png") expected_icc = with_icc.info['icc_profile'] im = roundtrip(im, icc_profile=expected_icc) self.assertEqual(im.info['icc_profile'], expected_icc) def test_discard_icc_profile(self): im = Image.open('Tests/images/icc_profile.png') im = roundtrip(im, icc_profile=None) self.assertNotIn('icc_profile', im.info) def test_roundtrip_icc_profile(self): im = Image.open('Tests/images/icc_profile.png') expected_icc = im.info['icc_profile'] im = roundtrip(im) self.assertEqual(im.info['icc_profile'], expected_icc) def test_roundtrip_no_icc_profile(self): im = Image.open("Tests/images/icc_profile_none.png") self.assertEqual(im.info['icc_profile'], None) im = roundtrip(im) self.assertNotIn('icc_profile', im.info) def test_repr_png(self): im = hopper() repr_png = Image.open(BytesIO(im._repr_png_())) self.assertEqual(repr_png.format, 'PNG') self.assert_image_equal(im, repr_png) def test_chunk_order(self): im = Image.open("Tests/images/icc_profile.png") test_file = self.tempfile("temp.png") im.convert("P").save(test_file, dpi=(100, 100)) chunks = [] fp = open(test_file, "rb") fp.read(8) png = PngImagePlugin.PngStream(fp) while True: cid, pos, length = png.read() chunks.append(cid) try: s = png.call(cid, pos, length) except EOFError: break png.crc(cid, s) # https://www.w3.org/TR/PNG/#5ChunkOrdering # IHDR - shall be first self.assertEqual(chunks.index(b"IHDR"), 0) # PLTE - before first IDAT self.assertLess(chunks.index(b"PLTE"), chunks.index(b"IDAT")) # iCCP - before PLTE and IDAT self.assertLess(chunks.index(b"iCCP"), chunks.index(b"PLTE")) self.assertLess(chunks.index(b"iCCP"), chunks.index(b"IDAT")) # tRNS - after PLTE, before IDAT self.assertGreater(chunks.index(b"tRNS"), chunks.index(b"PLTE")) self.assertLess(chunks.index(b"tRNS"), chunks.index(b"IDAT")) # pHYs - before IDAT self.assertLess(chunks.index(b"pHYs"), chunks.index(b"IDAT")) if __name__ == '__main__': unittest.main()