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Added more tests for PNG chunk ordering

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This commit is contained in:
Andrew Murray 2017-01-21 14:47:59 +11:00
parent 361f579579
commit ded14572a1
1 changed files with 14 additions and 1 deletions
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15
Tests/test_file_png.py
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@ -500,7 +500,7 @@ class TestFilePng(PillowTestCase):
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)
im.convert("P").save(test_file, dpi=(100, 100))
chunks = []
fp = open(test_file, "rb")
@ -514,7 +514,20 @@ class TestFilePng(PillowTestCase):
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__':