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comparison mercurial/revlog.py @ 46857:cc65cea90edb

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revlog: move the details of revlog "v1" index inside revlog.utils.constants The revlog module is quite large and this kind of format information would handy for other module. So let us start to gather this information about the format in a more appropriate place. We update various reference to this information to use the new "source of truth" in the process. Differential Revision: https://phab.mercurial-scm.org/D10304
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Mon, 05 Apr 2021 12:21:01 +0200
parents 34e1fa4b548a
children 85e3a630cad9
comparison
equal deleted inserted replaced
46856:34e1fa4b548a 46857:cc65cea90edb
40 from .pycompat import getattr 40 from .pycompat import getattr
41 from .revlogutils.constants import ( 41 from .revlogutils.constants import (
42 FLAG_GENERALDELTA, 42 FLAG_GENERALDELTA,
43 FLAG_INLINE_DATA, 43 FLAG_INLINE_DATA,
44 INDEX_ENTRY_V0, 44 INDEX_ENTRY_V0,
45 INDEX_ENTRY_V1,
45 REVLOGV0, 46 REVLOGV0,
46 REVLOGV1, 47 REVLOGV1,
47 REVLOGV1_FLAGS, 48 REVLOGV1_FLAGS,
48 REVLOGV2, 49 REVLOGV2,
49 REVLOGV2_FLAGS, 50 REVLOGV2_FLAGS,
324 entry[7], 325 entry[7],
325 ) 326 )
326 return INDEX_ENTRY_V0.pack(*e2) 327 return INDEX_ENTRY_V0.pack(*e2)
327 328
328 329
329 # index ng:
330 # 6 bytes: offset
331 # 2 bytes: flags
332 # 4 bytes: compressed length
333 # 4 bytes: uncompressed length
334 # 4 bytes: base rev
335 # 4 bytes: link rev
336 # 4 bytes: parent 1 rev
337 # 4 bytes: parent 2 rev
338 # 32 bytes: nodeid
339 indexformatng = struct.Struct(b">Qiiiiii20s12x")
340 indexformatng_pack = indexformatng.pack
341 versionformat = struct.Struct(b">I") 330 versionformat = struct.Struct(b">I")
342 versionformat_pack = versionformat.pack 331 versionformat_pack = versionformat.pack
343 versionformat_unpack = versionformat.unpack 332 versionformat_unpack = versionformat.unpack
344 333
345 # corresponds to uncompressed length of indexformatng (2 gigs, 4-byte 334 # corresponds to uncompressed length of indexformatng (2 gigs, 4-byte
347 _maxentrysize = 0x7FFFFFFF 336 _maxentrysize = 0x7FFFFFFF
348 337
349 338
350 class revlogio(object): 339 class revlogio(object):
351 def __init__(self): 340 def __init__(self):
352 self.size = indexformatng.size 341 self.size = INDEX_ENTRY_V1.size
353 342
354 def parseindex(self, data, inline): 343 def parseindex(self, data, inline):
355 # call the C implementation to parse the index data 344 # call the C implementation to parse the index data
356 index, cache = parsers.parse_index2(data, inline) 345 index, cache = parsers.parse_index2(data, inline)
357 return index, cache 346 return index, cache
358 347
359 def packentry(self, entry, node, version, rev): 348 def packentry(self, entry, node, version, rev):
360 p = indexformatng_pack(*entry) 349 p = INDEX_ENTRY_V1.pack(*entry)
361 if rev == 0: 350 if rev == 0:
362 p = versionformat_pack(version) + p[4:] 351 p = versionformat_pack(version) + p[4:]
363 return p 352 return p
364 353
365 354