png.py 文件源码

def testExtraPixels(self):
        """Test file that contains too many pixels."""

        def eachchunk(chunk):
            if chunk[0] != 'IDAT':
                return chunk
            data = zlib.decompress(chunk[1])
            data += strtobytes('\x00garbage')
            data = zlib.compress(data)
            chunk = (chunk[0], data)
            return chunk
        self.assertRaises(FormatError, self.helperFormat, eachchunk)