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  • Committer: Ian Clatworthy
  • Date: 2009-12-03 23:21:16 UTC
  • mfrom: (4852.4.1 RCStoVCS)
  • mto: This revision was merged to the branch mainline in revision 4860.
  • Revision ID: ian.clatworthy@canonical.com-20091203232116-f8igfvc6muqrn4yx
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bzrlib/tuned_gzip.py
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# Copyright (C) 2006-2011 Canonical Ltd
 
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# Copyright (C) 2005, 2006 Canonical Ltd
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# Written by Robert Collins <robert.collins@canonical.com>
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#
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# This program is free software; you can redistribute it and/or modify
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"""Bzrlib specific gzip tunings. We plan to feed these to the upstream gzip."""
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from __future__ import absolute_import
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from cStringIO import StringIO
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# make GzipFile faster:
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import zlib
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# we want a \n preserved, break on \n only splitlines.
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from bzrlib import symbol_versioning
 
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import bzrlib
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__all__ = ["GzipFile", "bytes_to_gzip"]
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    Yes, its only 1.6 seconds, but they add up.
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    """
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    def __init__(self, *args, **kwargs):
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        symbol_versioning.warn(
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            symbol_versioning.deprecated_in((2, 3, 0))
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            % 'bzrlib.tuned_gzip.GzipFile',
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            DeprecationWarning, stacklevel=2)
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        gzip.GzipFile.__init__(self, *args, **kwargs)
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    def _add_read_data(self, data):
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        # 4169 calls in 183
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        # temp var for len(data) and switch to +='s.
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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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