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# We then check the that the computed CRC and size of the
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# uncompressed data matches the stored values. Note that the size
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# stored is the true file size mod 2**32.
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crc32, isize = struct.unpack("<LL", self._gzip_tail)
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# note that isize is unsigned - it can exceed 2GB
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if crc32 != U32(self.crc):