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annotate mercurial/revlogutils/constants.py @ 39357:655b5b465953

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revlog: split functionality related to deltas computation in a new module The revlog module is getting big and this logic is getting more and more advanced. Moving it to `mercurial.revlogutils.deltas` split a lot off revlog.py and will help this logic to become less interleaved with revlog. The code is simply moved without modification (but for namespace changes). Refactoring and improvement will be made in later changesets.
author Boris Feld <boris.feld@octobus.net>
date Thu, 16 Aug 2018 02:53:42 +0200
parents 729082bb9938
children b66ea3fc3a86
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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729082bb9938 revlog: split constants into a new `revlogutils.constants` module
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1 # revlogdeltas.py - constant used for revlog logic
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2 #
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3 # Copyright 2005-2007 Matt Mackall <mpm@selenic.com>
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4 # Copyright 2018 Octobus <contact@octobus.net>
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5 #
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6 # This software may be used and distributed according to the terms of the
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7 # GNU General Public License version 2 or any later version.
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8 """Helper class to compute deltas stored inside revlogs"""
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9
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10 from __future__ import absolute_import
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11
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12 from .. import (
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13 util,
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14 )
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15
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16 # revlog header flags
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17 REVLOGV0 = 0
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18 REVLOGV1 = 1
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19 # Dummy value until file format is finalized.
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20 # Reminder: change the bounds check in revlog.__init__ when this is changed.
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21 REVLOGV2 = 0xDEAD
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22 FLAG_INLINE_DATA = (1 << 16)
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23 FLAG_GENERALDELTA = (1 << 17)
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24 REVLOG_DEFAULT_FLAGS = FLAG_INLINE_DATA
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25 REVLOG_DEFAULT_FORMAT = REVLOGV1
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26 REVLOG_DEFAULT_VERSION = REVLOG_DEFAULT_FORMAT | REVLOG_DEFAULT_FLAGS
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27 REVLOGV1_FLAGS = FLAG_INLINE_DATA | FLAG_GENERALDELTA
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28 REVLOGV2_FLAGS = REVLOGV1_FLAGS
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29
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30 # revlog index flags
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31 REVIDX_ISCENSORED = (1 << 15) # revision has censor metadata, must be verified
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32 REVIDX_ELLIPSIS = (1 << 14) # revision hash does not match data (narrowhg)
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33 REVIDX_EXTSTORED = (1 << 13) # revision data is stored externally
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34 REVIDX_DEFAULT_FLAGS = 0
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35 # stable order in which flags need to be processed and their processors applied
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36 REVIDX_FLAGS_ORDER = [
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37 REVIDX_ISCENSORED,
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38 REVIDX_ELLIPSIS,
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39 REVIDX_EXTSTORED,
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40 ]
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41 REVIDX_KNOWN_FLAGS = util.bitsfrom(REVIDX_FLAGS_ORDER)
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42 # bitmark for flags that could cause rawdata content change
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43 REVIDX_RAWTEXT_CHANGING_FLAGS = REVIDX_ISCENSORED | REVIDX_EXTSTORED