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Fixed reading PNG iCCP compression method

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This commit is contained in:
Andrew Murray 2024-02-22 19:50:36 +11:00
parent b8722f3431
commit 383ac4fca0
3 changed files with 6 additions and 2 deletions
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Tests/images/unknown_compression_method.png Normal file
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4
Tests/test_file_png.py
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@ -619,6 +619,10 @@ class TestFilePng:
with Image.open("Tests/images/hopper_idat_after_image_end.png") as im:
assert im.text == {"TXT": "VALUE", "ZIP": "VALUE"}
def test_unknown_compression_method(self) -> None:
with pytest.raises(SyntaxError, match="Unknown compression method"):
PngImagePlugin.PngImageFile("Tests/images/unknown_compression_method.png")
def test_padded_idat(self) -> None:
# This image has been manually hexedited
# so that the IDAT chunk has padding at the end

4
src/PIL/PngImagePlugin.py
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@ -392,8 +392,8 @@ class PngStream(ChunkStream):
# Compressed profile n bytes (zlib with deflate compression)
i = s.find(b"\0")
logger.debug("iCCP profile name %r", s[:i])
logger.debug("Compression method %s", s[i])
comp_method = s[i]
comp_method = s[i + 1]
logger.debug("Compression method %s", comp_method)
if comp_method != 0:
msg = f"Unknown compression method {comp_method} in iCCP chunk"
raise SyntaxError(msg)