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  • Committer: John Arbash Meinel
  • Date: 2006-08-08 02:42:14 UTC
  • mto: This revision was merged to the branch mainline in revision 1937.
  • Revision ID: john@arbash-meinel.com-20060808024214-b42d83366464c2ce
Shave another second off of _record_to_data time, by optimizing single write versus multiple writes

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bzrlib/tuned_gzip.py
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        self.extrasize += len_data
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        self.size += len_data
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    def _write_gzip_header(self):
 
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        """A tuned version of gzip._write_gzip_header
 
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        We have some extra constrains that plain Gzip does not.
 
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        1) We can write the whole blob at once. rather than multiple calls to 
 
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           fileobj.write().
 
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        2) We never have a filename
 
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        3) We don't care about the time
 
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        """
 
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        self.fileobj.write(
 
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           '\037\213'   # self.fileobj.write('\037\213')  # magic header
 
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            '\010'      # self.fileobj.write('\010')      # compression method
 
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                        # fname = self.filename[:-3]
 
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                        # flags = 0
 
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                        # if fname:
 
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                        #     flags = FNAME
 
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            '\x00'      # self.fileobj.write(chr(flags))
 
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            '\0\0\0\0'  # write32u(self.fileobj, long(time.time()))
 
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            '\002'      # self.fileobj.write('\002')
 
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            '\377'      # self.fileobj.write('\377')
 
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                        # if fname:
 
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            ''          #     self.fileobj.write(fname + '\000')
 
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            )
 
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    def _read(self, size=1024):
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        # various optimisations:
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        # reduces lsprof count from 2500 to