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annotate mercurial/revlogutils/constants.py @ 41013:ef103c96ed33

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fuzz: extract Python initialization to utility package Avoids code duplication between fuzzers of parsers.so. Differential Revision: https://phab.mercurial-scm.org/D5461
author Augie Fackler <augie@google.com>
date Wed, 19 Dec 2018 21:57:23 -0500
parents 8e398628a3f2
children e7a2cc84dbc0
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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 repository,
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14 util,
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15 )
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16
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17 # revlog header flags
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18 REVLOGV0 = 0
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19 REVLOGV1 = 1
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20 # Dummy value until file format is finalized.
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21 # Reminder: change the bounds check in revlog.__init__ when this is changed.
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22 REVLOGV2 = 0xDEAD
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23 FLAG_INLINE_DATA = (1 << 16)
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24 FLAG_GENERALDELTA = (1 << 17)
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25 REVLOG_DEFAULT_FLAGS = FLAG_INLINE_DATA
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26 REVLOG_DEFAULT_FORMAT = REVLOGV1
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27 REVLOG_DEFAULT_VERSION = REVLOG_DEFAULT_FORMAT | REVLOG_DEFAULT_FLAGS
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28 REVLOGV1_FLAGS = FLAG_INLINE_DATA | FLAG_GENERALDELTA
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29 REVLOGV2_FLAGS = REVLOGV1_FLAGS
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31 # revlog index flags
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32
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33 # For historical reasons, revlog's internal flags were exposed via the
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34 # wire protocol and are even exposed in parts of the storage APIs.
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35
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36 # revision has censor metadata, must be verified
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37 REVIDX_ISCENSORED = repository.REVISION_FLAG_CENSORED
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38 # revision hash does not match data (narrowhg)
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39 REVIDX_ELLIPSIS = repository.REVISION_FLAG_ELLIPSIS
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40 # revision data is stored externally
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41 REVIDX_EXTSTORED = repository.REVISION_FLAG_EXTSTORED
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42 REVIDX_DEFAULT_FLAGS = 0
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43 # stable order in which flags need to be processed and their processors applied
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44 REVIDX_FLAGS_ORDER = [
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45 REVIDX_ISCENSORED,
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46 REVIDX_ELLIPSIS,
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47 REVIDX_EXTSTORED,
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48 ]
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49 REVIDX_KNOWN_FLAGS = util.bitsfrom(REVIDX_FLAGS_ORDER)
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50 # bitmark for flags that could cause rawdata content change
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51 REVIDX_RAWTEXT_CHANGING_FLAGS = REVIDX_ISCENSORED | REVIDX_EXTSTORED
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52
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53 SPARSE_REVLOG_MAX_CHAIN_LENGTH = 1000
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54