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annotate mercurial/revlogutils/revlogv0.py @ 47267:2b69555e4875

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revlog: introduce a compression mode for sidedata in the revlog index We will use this for compression for the sidedata payload. Differential Revision: https://phab.mercurial-scm.org/D10653
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Mon, 03 May 2021 21:34:02 +0200
parents 130c9f7ed914
children 9d1a8829f959
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1 # revlogv0 - code related to revlog format "V0"
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2 #
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3 # Copyright 2005-2007 Olivia Mackall <olivia@selenic.com>
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4 #
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5 # This software may be used and distributed according to the terms of the
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6 # GNU General Public License version 2 or any later version.
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7 from __future__ import absolute_import
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8
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9
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10 from ..node import sha1nodeconstants
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11 from .constants import (
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12 COMP_MODE_INLINE,
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13 INDEX_ENTRY_V0,
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14 )
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15 from ..i18n import _
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16
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17 from .. import (
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18 error,
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19 node,
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20 pycompat,
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21 util,
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22 )
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23
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24 from . import (
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25 flagutil,
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26 nodemap as nodemaputil,
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27 )
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30 def getoffset(q):
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31 return int(q >> 16)
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32
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33
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34 def gettype(q):
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35 return int(q & 0xFFFF)
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36
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37
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38 def offset_type(offset, type):
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39 if (type & ~flagutil.REVIDX_KNOWN_FLAGS) != 0:
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40 raise ValueError(b'unknown revlog index flags')
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41 return int(int(offset) << 16 | type)
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42
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43
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44 class revlogoldindex(list):
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45 entry_size = INDEX_ENTRY_V0.size
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46 null_item = (
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47 0,
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48 0,
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49 0,
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50 -1,
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51 -1,
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52 -1,
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53 -1,
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54 sha1nodeconstants.nullid,
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55 0,
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56 0,
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57 COMP_MODE_INLINE,
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58 COMP_MODE_INLINE,
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59 )
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60
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61 @property
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62 def nodemap(self):
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63 msg = b"index.nodemap is deprecated, use index.[has_node|rev|get_rev]"
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64 util.nouideprecwarn(msg, b'5.3', stacklevel=2)
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65 return self._nodemap
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66
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67 @util.propertycache
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68 def _nodemap(self):
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69 nodemap = nodemaputil.NodeMap({sha1nodeconstants.nullid: node.nullrev})
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70 for r in range(0, len(self)):
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71 n = self[r][7]
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72 nodemap[n] = r
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73 return nodemap
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74
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75 def has_node(self, node):
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76 """return True if the node exist in the index"""
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77 return node in self._nodemap
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78
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79 def rev(self, node):
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80 """return a revision for a node
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81
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82 If the node is unknown, raise a RevlogError"""
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83 return self._nodemap[node]
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84
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85 def get_rev(self, node):
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86 """return a revision for a node
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87
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88 If the node is unknown, return None"""
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89 return self._nodemap.get(node)
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90
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91 def append(self, tup):
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92 self._nodemap[tup[7]] = len(self)
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93 super(revlogoldindex, self).append(tup)
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94
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95 def __delitem__(self, i):
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96 if not isinstance(i, slice) or not i.stop == -1 or i.step is not None:
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97 raise ValueError(b"deleting slices only supports a:-1 with step 1")
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98 for r in pycompat.xrange(i.start, len(self)):
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99 del self._nodemap[self[r][7]]
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100 super(revlogoldindex, self).__delitem__(i)
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101
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102 def clearcaches(self):
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103 self.__dict__.pop('_nodemap', None)
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104
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105 def __getitem__(self, i):
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106 if i == -1:
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107 return self.null_item
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108 return list.__getitem__(self, i)
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109
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110 def pack_header(self, header):
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111 """pack header information in binary"""
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112 return b''
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113
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114 def entry_binary(self, rev):
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115 """return the raw binary string representing a revision"""
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116 entry = self[rev]
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117 if gettype(entry[0]):
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118 raise error.RevlogError(
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119 _(b'index entry flags need revlog version 1')
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120 )
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121 e2 = (
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122 getoffset(entry[0]),
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123 entry[1],
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124 entry[3],
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125 entry[4],
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126 self[entry[5]][7],
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127 self[entry[6]][7],
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128 entry[7],
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129 )
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130 return INDEX_ENTRY_V0.pack(*e2)
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131
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132
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133 def parse_index_v0(data, inline):
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134 s = INDEX_ENTRY_V0.size
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135 index = []
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136 nodemap = nodemaputil.NodeMap({node.nullid: node.nullrev})
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137 n = off = 0
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138 l = len(data)
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139 while off + s <= l:
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140 cur = data[off : off + s]
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141 off += s
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142 e = INDEX_ENTRY_V0.unpack(cur)
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143 # transform to revlogv1 format
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144 e2 = (
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145 offset_type(e[0], 0),
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146 e[1],
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147 -1,
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148 e[2],
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149 e[3],
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150 nodemap.get(e[4], node.nullrev),
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151 nodemap.get(e[5], node.nullrev),
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152 e[6],
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153 0, # no side data support
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154 0, # no side data support
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155 COMP_MODE_INLINE,
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156 )
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157 index.append(e2)
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158 nodemap[e[6]] = n
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159 n += 1
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160
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161 index = revlogoldindex(index)
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162 return index, None