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comparison mercurial/pure/parsers.py @ 47249:130c9f7ed914

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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 78230d036e5d
children 6bfa6c2c5f15
comparison
equal deleted inserted replaced
47248:013c645dd28c 47249:130c9f7ed914
52 # Size of a C unsigned long long int, platform independent 52 # Size of a C unsigned long long int, platform independent
53 big_int_size = struct.calcsize(b'>Q') 53 big_int_size = struct.calcsize(b'>Q')
54 # Size of a C long int, platform independent 54 # Size of a C long int, platform independent
55 int_size = struct.calcsize(b'>i') 55 int_size = struct.calcsize(b'>i')
56 # An empty index entry, used as a default value to be overridden, or nullrev 56 # An empty index entry, used as a default value to be overridden, or nullrev
57 null_item = (0, 0, 0, -1, -1, -1, -1, sha1nodeconstants.nullid, 0, 0) 57 null_item = (
58 0,
59 0,
60 0,
61 -1,
62 -1,
63 -1,
64 -1,
65 sha1nodeconstants.nullid,
66 0,
67 0,
68 revlog_constants.COMP_MODE_INLINE,
69 )
58 70
59 @util.propertycache 71 @util.propertycache
60 def entry_size(self): 72 def entry_size(self):
61 return self.index_format.size 73 return self.index_format.size
62 74
133 r = (offset_type(0, gettype(r[0])),) + r[1:] 145 r = (offset_type(0, gettype(r[0])),) + r[1:]
134 return r 146 return r
135 147
136 def _unpack_entry(self, data): 148 def _unpack_entry(self, data):
137 r = self.index_format.unpack(data) 149 r = self.index_format.unpack(data)
138 r = r + (0, 0) 150 r = r + (0, 0, revlog_constants.COMP_MODE_INLINE)
139 return r 151 return r
140 152
141 def pack_header(self, header): 153 def pack_header(self, header):
142 """pack header information as binary""" 154 """pack header information as binary"""
143 v_fmt = revlog_constants.INDEX_HEADER 155 v_fmt = revlog_constants.INDEX_HEADER
301 entry = tuple(entry) 313 entry = tuple(entry)
302 new = self._pack_entry(entry) 314 new = self._pack_entry(entry)
303 self._extra[rev - self._lgt] = new 315 self._extra[rev - self._lgt] = new
304 316
305 def _unpack_entry(self, data): 317 def _unpack_entry(self, data):
306 return self.index_format.unpack(data) 318 return self.index_format.unpack(data) + (
319 revlog_constants.COMP_MODE_INLINE,
320 )
307 321
308 def _pack_entry(self, entry): 322 def _pack_entry(self, entry):
309 return self.index_format.pack(*entry) 323 return self.index_format.pack(*entry[:10])
310 324
311 def entry_binary(self, rev): 325 def entry_binary(self, rev):
312 """return the raw binary string representing a revision""" 326 """return the raw binary string representing a revision"""
313 entry = self[rev] 327 entry = self[rev]
314 p = revlog_constants.INDEX_ENTRY_V2.pack(*entry) 328 return self._pack_entry(entry)
315 return p
316 329
317 def pack_header(self, header): 330 def pack_header(self, header):
318 """pack header information as binary""" 331 """pack header information as binary"""
319 msg = 'version header should go in the docket, not the index: %d' 332 msg = 'version header should go in the docket, not the index: %d'
320 msg %= header 333 msg %= header