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comparison mercurial/revlogutils/sidedata.py @ 43034:294afb982a88

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sidedata: add a function to read sidedata from revlog raw text This implement the "reading" part of a `sidedata` flag processor. Differential Revision: https://phab.mercurial-scm.org/D6890
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Wed, 04 Sep 2019 00:59:15 +0200
parents 21025a4107d4
children ea83abf95630
comparison
equal deleted inserted replaced
43033:21025a4107d4 43034:294afb982a88
30 This is a simple and effective format. It should be enought to experiment with 30 This is a simple and effective format. It should be enought to experiment with
31 the concept. 31 the concept.
32 """ 32 """
33 33
34 from __future__ import absolute_import 34 from __future__ import absolute_import
35
36 import hashlib
37 import struct
38
39 from .. import error
40
41 SIDEDATA_HEADER = struct.Struct('>H')
42 SIDEDATA_ENTRY = struct.Struct('>HL20s')
43
44 def sidedatareadprocessor(rl, text):
45 sidedata = {}
46 offset = 0
47 nbentry, = SIDEDATA_HEADER.unpack(text[:SIDEDATA_HEADER.size])
48 offset += SIDEDATA_HEADER.size
49 dataoffset = SIDEDATA_HEADER.size + (SIDEDATA_ENTRY.size * nbentry)
50 for i in range(nbentry):
51 nextoffset = offset + SIDEDATA_ENTRY.size
52 key, size, storeddigest = SIDEDATA_ENTRY.unpack(text[offset:nextoffset])
53 offset = nextoffset
54 # read the data associated with that entry
55 nextdataoffset = dataoffset + size
56 entrytext = text[dataoffset:nextdataoffset]
57 readdigest = hashlib.sha1(entrytext).digest()
58 if storeddigest != readdigest:
59 raise error.SidedataHashError(key, storeddigest, readdigest)
60 sidedata[key] = entrytext
61 dataoffset = nextdataoffset
62 text = text[dataoffset:]
63 return text, True, sidedata