Mercurial > public > mercurial-scm > hg-stable
diff mercurial/revlogutils/constants.py @ 47260:130c9f7ed914
revlog: add a "data compression mode" entry in the index tuple
That will make it possible to keep track of compression information in the
revlog index, opening the way to more efficient revision restoration (in native
code, but the python usage is already defeating performance work).
We start with adding a new entry to the index tuple, using a value matching the
current behavior. We will introduce storage and other value in later changesets.
Differential Revision: https://phab.mercurial-scm.org/D10646
| author | Pierre-Yves David <pierre-yves.david@octobus.net> |
|---|---|
| date | Mon, 03 May 2021 18:19:16 +0200 |
| parents | 616b8f412676 |
| children | 6bfa6c2c5f15 |
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--- a/mercurial/revlogutils/constants.py Tue May 04 01:15:03 2021 +0200 +++ b/mercurial/revlogutils/constants.py Mon May 03 18:19:16 2021 +0200 @@ -1,4 +1,4 @@ -# revlogdeltas.py - constant used for revlog logic +# revlogdeltas.py - constant used for revlog logic. # # Copyright 2005-2007 Olivia Mackall <olivia@selenic.com> # Copyright 2018 Octobus <contact@octobus.net> @@ -114,6 +114,14 @@ # bitmark for flags that could cause rawdata content change REVIDX_RAWTEXT_CHANGING_FLAGS = REVIDX_ISCENSORED | REVIDX_EXTSTORED +## chunk compression mode constants: +# These constants are used in revlog version >=2 to denote the compression used +# for a chunk. + +# Chunk use a compression mode stored "inline" at the start of the chunk +# itself. This is the mode always used for revlog version "0" and "1" +COMP_MODE_INLINE = 2 + SUPPORTED_FLAGS = { REVLOGV0: REVLOGV0_FLAGS, REVLOGV1: REVLOGV1_FLAGS, @@ -152,4 +160,5 @@ }, } + SPARSE_REVLOG_MAX_CHAIN_LENGTH = 1000