Mercurial > hg
view mercurial/revlogutils/revlogv0.py @ 47387:75e1104f23a2
revlog: use dedicated code for reading sidedata
We are about to introduce a new, dedicated, file to store sidedata. Before doing so, we make sidedata reading go through different code as reading data chunk. This will simplify some of the complexity of the next changesets.
The reading is very simple right now and will need some improvement later to
reuse some of the caching strategy we use for the data file.
Differential Revision: https://phab.mercurial-scm.org/D10785
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
---|---|
date | Thu, 27 May 2021 04:09:30 +0200 |
parents | 9d1a8829f959 |
children | ac60a1366a49 |
line wrap: on
line source
# revlogv0 - code related to revlog format "V0" # # Copyright 2005-2007 Olivia Mackall <olivia@selenic.com> # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. from __future__ import absolute_import from ..node import sha1nodeconstants from .constants import ( COMP_MODE_INLINE, INDEX_ENTRY_V0, ) from ..i18n import _ from .. import ( error, node, pycompat, util, ) from . import ( flagutil, nodemap as nodemaputil, ) def getoffset(q): return int(q >> 16) def gettype(q): return int(q & 0xFFFF) def offset_type(offset, type): if (type & ~flagutil.REVIDX_KNOWN_FLAGS) != 0: raise ValueError(b'unknown revlog index flags') return int(int(offset) << 16 | type) class revlogoldindex(list): rust_ext_compat = 0 entry_size = INDEX_ENTRY_V0.size null_item = ( 0, 0, 0, -1, -1, -1, -1, sha1nodeconstants.nullid, 0, 0, COMP_MODE_INLINE, COMP_MODE_INLINE, ) @property def nodemap(self): msg = b"index.nodemap is deprecated, use index.[has_node|rev|get_rev]" util.nouideprecwarn(msg, b'5.3', stacklevel=2) return self._nodemap @util.propertycache def _nodemap(self): nodemap = nodemaputil.NodeMap({sha1nodeconstants.nullid: node.nullrev}) for r in range(0, len(self)): n = self[r][7] nodemap[n] = r return nodemap def has_node(self, node): """return True if the node exist in the index""" return node in self._nodemap def rev(self, node): """return a revision for a node If the node is unknown, raise a RevlogError""" return self._nodemap[node] def get_rev(self, node): """return a revision for a node If the node is unknown, return None""" return self._nodemap.get(node) def append(self, tup): self._nodemap[tup[7]] = len(self) super(revlogoldindex, self).append(tup) def __delitem__(self, i): if not isinstance(i, slice) or not i.stop == -1 or i.step is not None: raise ValueError(b"deleting slices only supports a:-1 with step 1") for r in pycompat.xrange(i.start, len(self)): del self._nodemap[self[r][7]] super(revlogoldindex, self).__delitem__(i) def clearcaches(self): self.__dict__.pop('_nodemap', None) def __getitem__(self, i): if i == -1: return self.null_item return list.__getitem__(self, i) def pack_header(self, header): """pack header information in binary""" return b'' def entry_binary(self, rev): """return the raw binary string representing a revision""" entry = self[rev] if gettype(entry[0]): raise error.RevlogError( _(b'index entry flags need revlog version 1') ) e2 = ( getoffset(entry[0]), entry[1], entry[3], entry[4], self[entry[5]][7], self[entry[6]][7], entry[7], ) return INDEX_ENTRY_V0.pack(*e2) def parse_index_v0(data, inline): s = INDEX_ENTRY_V0.size index = [] nodemap = nodemaputil.NodeMap({node.nullid: node.nullrev}) n = off = 0 l = len(data) while off + s <= l: cur = data[off : off + s] off += s e = INDEX_ENTRY_V0.unpack(cur) # transform to revlogv1 format e2 = ( offset_type(e[0], 0), e[1], -1, e[2], e[3], nodemap.get(e[4], node.nullrev), nodemap.get(e[5], node.nullrev), e[6], 0, # no side data support 0, # no side data support COMP_MODE_INLINE, ) index.append(e2) nodemap[e[6]] = n n += 1 index = revlogoldindex(index) return index, None