validators: png signature as bytes
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@ -747,7 +747,7 @@ def pngValidator(path=None, data=None, fileObj=None):
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pos = fileObj.tell()
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signature = fileObj.read(8)
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fileObj.seek(pos)
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if signature != "\x89PNG\r\n\x1a\n":
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if signature != b"\x89PNG\r\n\x1a\n":
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return False, "Image does not begin with the PNG signature."
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return True, None
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