Mercurial > hg
view mercurial/revlogutils/revlogv0.py @ 51347:555826073625
delta-find: introduce and use specialized _DeltaSearch class
For now, we introduce some very simple variant, but they are still useful to
display how having the class can helps keeping the simple case simple and
their special case out of more advanced logic.
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Sun, 07 Jan 2024 03:34:27 +0100 |
parents | d44e3c45f0e4 |
children | f4733654f144 |
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# 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 ..node import sha1nodeconstants from .constants import ( INDEX_ENTRY_V0, ) from ..i18n import _ from .. import ( error, node, revlogutils, util, ) from . import ( nodemap as nodemaputil, ) def getoffset(q): return int(q >> 16) def gettype(q): return int(q & 0xFFFF) class revlogoldindex(list): rust_ext_compat = 0 entry_size = INDEX_ENTRY_V0.size null_item = revlogutils.entry( data_offset=0, data_compressed_length=0, data_delta_base=node.nullrev, link_rev=node.nullrev, parent_rev_1=node.nullrev, parent_rev_2=node.nullrev, node_id=sha1nodeconstants.nullid, ) @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 range(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 = revlogutils.entry( data_offset=e[0], data_compressed_length=e[1], data_delta_base=e[2], link_rev=e[3], parent_rev_1=nodemap.get(e[4], node.nullrev), parent_rev_2=nodemap.get(e[5], node.nullrev), node_id=e[6], ) index.append(e2) nodemap[e[6]] = n n += 1 index = revlogoldindex(index) return index, None