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(gz) Adapt tuned_gzip to changes to gzip module crc handling in Python 2.7
 (Martin [gz])

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bzrlib/tuned_gzip.py
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        # (4 seconds to 1 seconds for the sample upgrades I was testing).
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        self.write(''.join(lines))
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    if sys.version_info > (2, 7):
 
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        # As of Python 2.7 the crc32 must be positive when close is called
 
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        def close(self):
 
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            if self.fileobj is None:
 
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                return
 
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            if self.mode == gzip.WRITE:
 
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                self.crc &= 0xFFFFFFFFL
 
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            gzip.GzipFile.close(self)
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