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revlog: compress sidedata in `_writeentry` When appropriate we store the sidedata in a compressed form. Differential Revision: https://phab.mercurial-scm.org/D10655
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Mon, 03 May 2021 23:14:48 +0200
parents 87d057137f82
children 07641bafa646
comparison
equal deleted inserted replaced
47268:87d057137f82 47269:c4dbb7636a12
2535 sidedata_compression_mode = COMP_MODE_INLINE 2535 sidedata_compression_mode = COMP_MODE_INLINE
2536 if sidedata and self.hassidedata: 2536 if sidedata and self.hassidedata:
2537 sidedata_compression_mode = COMP_MODE_PLAIN 2537 sidedata_compression_mode = COMP_MODE_PLAIN
2538 serialized_sidedata = sidedatautil.serialize_sidedata(sidedata) 2538 serialized_sidedata = sidedatautil.serialize_sidedata(sidedata)
2539 sidedata_offset = offset + deltainfo.deltalen 2539 sidedata_offset = offset + deltainfo.deltalen
2540 h, comp_sidedata = self.compress(serialized_sidedata)
2541 if (
2542 h != b'u'
2543 and comp_sidedata[0:1] != b'\0'
2544 and len(comp_sidedata) < len(serialized_sidedata)
2545 ):
2546 assert not h
2547 if (
2548 comp_sidedata[0:1]
2549 == self._docket.default_compression_header
2550 ):
2551 sidedata_compression_mode = COMP_MODE_DEFAULT
2552 serialized_sidedata = comp_sidedata
2553 else:
2554 sidedata_compression_mode = COMP_MODE_INLINE
2555 serialized_sidedata = comp_sidedata
2540 else: 2556 else:
2541 serialized_sidedata = b"" 2557 serialized_sidedata = b""
2542 # Don't store the offset if the sidedata is empty, that way 2558 # Don't store the offset if the sidedata is empty, that way
2543 # we can easily detect empty sidedata and they will be no different 2559 # we can easily detect empty sidedata and they will be no different
2544 # than ones we manually add. 2560 # than ones we manually add.