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comparison mercurial/revlogutils/constants.py @ 39356:729082bb9938

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revlog: split constants into a new `revlogutils.constants` module We want to split some logic out of the main revlog file (the delta computing logic). However, this logic needs access to multiple constants related to the revlog. So we move all revlog related constants into a new module that could be imported from multiple places. We don't copy the file (preserving blame history) because there are only a few moving lines. Also, copying the file would result in annoying merge conflicts with ongoing work from others contributors.
author Boris Feld <boris.feld@octobus.net>
date Thu, 16 Aug 2018 02:08:13 +0200
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children 655b5b465953
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39355:94a4980695f8 39356:729082bb9938
1 # revlogdeltas.py - constant used for revlog logic
2 #
3 # Copyright 2005-2007 Matt Mackall <mpm@selenic.com>
4 # Copyright 2018 Octobus <contact@octobus.net>
5 #
6 # This software may be used and distributed according to the terms of the
7 # GNU General Public License version 2 or any later version.
8 """Helper class to compute deltas stored inside revlogs"""
9
10 from __future__ import absolute_import
11
12 from .. import (
13 util,
14 )
15
16 # revlog header flags
17 REVLOGV0 = 0
18 REVLOGV1 = 1
19 # Dummy value until file format is finalized.
20 # Reminder: change the bounds check in revlog.__init__ when this is changed.
21 REVLOGV2 = 0xDEAD
22 FLAG_INLINE_DATA = (1 << 16)
23 FLAG_GENERALDELTA = (1 << 17)
24 REVLOG_DEFAULT_FLAGS = FLAG_INLINE_DATA
25 REVLOG_DEFAULT_FORMAT = REVLOGV1
26 REVLOG_DEFAULT_VERSION = REVLOG_DEFAULT_FORMAT | REVLOG_DEFAULT_FLAGS
27 REVLOGV1_FLAGS = FLAG_INLINE_DATA | FLAG_GENERALDELTA
28 REVLOGV2_FLAGS = REVLOGV1_FLAGS
29
30 # revlog index flags
31 REVIDX_ISCENSORED = (1 << 15) # revision has censor metadata, must be verified
32 REVIDX_ELLIPSIS = (1 << 14) # revision hash does not match data (narrowhg)
33 REVIDX_EXTSTORED = (1 << 13) # revision data is stored externally
34 REVIDX_DEFAULT_FLAGS = 0
35 # stable order in which flags need to be processed and their processors applied
36 REVIDX_FLAGS_ORDER = [
37 REVIDX_ISCENSORED,
38 REVIDX_ELLIPSIS,
39 REVIDX_EXTSTORED,
40 ]
41 REVIDX_KNOWN_FLAGS = util.bitsfrom(REVIDX_FLAGS_ORDER)
42 # bitmark for flags that could cause rawdata content change
43 REVIDX_RAWTEXT_CHANGING_FLAGS = REVIDX_ISCENSORED | REVIDX_EXTSTORED
44
45 # maximum <delta-chain-data>/<revision-text-length> ratio
46 LIMIT_DELTA2TEXT = 2