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Fix PNG seek and tell #4512

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merged 3 commits into from Apr 2, 2020
Merged

Fix PNG seek and tell #4512

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0a757b7
Initialise __frame = 0
hugovk Apr 1, 2020
1c2b2b0
Add test case
hugovk Apr 1, 2020
2e9030d
Initialise __frame = 0 in open, and test tell
hugovk Apr 2, 2020
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4 changes: 4 additions & 0 deletions Tests/test_file_png.py
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Expand Up @@ -629,6 +629,10 @@ def test_exif_argument(self, tmp_path):
with Image.open(test_file) as reloaded:
assert reloaded.info["exif"] == b"Exif\x00\x00exifstring"

def test_seek(self, tmp_path):
with Image.open(TEST_PNG_FILE) as im:
im.seek(0)


@pytest.mark.skipif(is_win32(), reason="Requires Unix or macOS")
@skip_unless_feature("zlib")
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1 change: 1 addition & 0 deletions src/PIL/PngImagePlugin.py
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Expand Up @@ -630,6 +630,7 @@ class PngImageFile(ImageFile.ImageFile):

format = "PNG"
format_description = "Portable network graphics"
__frame = 0
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def _open(self):

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