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annotate mercurial/revlogutils/constants.py @ 42466:465f2d0df9ae

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deltas: accept and skip None return for delta info They are some extra computation that will shortcut the delta compression if the delta seems hopeless, returning None.
author Valentin Gatien-Baron <vgatien-baron@janestreet.com>
date Mon, 21 Jan 2019 22:37:30 +0100
parents e7a2cc84dbc0
children 92ac6b1697a7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 # Shared across v1 and v2.
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24 FLAG_INLINE_DATA = (1 << 16)
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25 # Only used by v1, implied by v2.
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26 FLAG_GENERALDELTA = (1 << 17)
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27 REVLOG_DEFAULT_FLAGS = FLAG_INLINE_DATA
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28 REVLOG_DEFAULT_FORMAT = REVLOGV1
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29 REVLOG_DEFAULT_VERSION = REVLOG_DEFAULT_FORMAT | REVLOG_DEFAULT_FLAGS
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30 REVLOGV1_FLAGS = FLAG_INLINE_DATA | FLAG_GENERALDELTA
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31 REVLOGV2_FLAGS = FLAG_INLINE_DATA
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32
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33 # revlog index flags
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34
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35 # For historical reasons, revlog's internal flags were exposed via the
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36 # wire protocol and are even exposed in parts of the storage APIs.
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37
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38 # revision has censor metadata, must be verified
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39 REVIDX_ISCENSORED = repository.REVISION_FLAG_CENSORED
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40 # revision hash does not match data (narrowhg)
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41 REVIDX_ELLIPSIS = repository.REVISION_FLAG_ELLIPSIS
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42 # revision data is stored externally
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43 REVIDX_EXTSTORED = repository.REVISION_FLAG_EXTSTORED
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44 REVIDX_DEFAULT_FLAGS = 0
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45 # stable order in which flags need to be processed and their processors applied
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46 REVIDX_FLAGS_ORDER = [
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47 REVIDX_ISCENSORED,
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48 REVIDX_ELLIPSIS,
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49 REVIDX_EXTSTORED,
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50 ]
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51 REVIDX_KNOWN_FLAGS = util.bitsfrom(REVIDX_FLAGS_ORDER)
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52 # bitmark for flags that could cause rawdata content change
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53 REVIDX_RAWTEXT_CHANGING_FLAGS = REVIDX_ISCENSORED | REVIDX_EXTSTORED
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55 SPARSE_REVLOG_MAX_CHAIN_LENGTH = 1000
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56