D7844: nodemap: code to parse the persistent binary nodemap data
marmoute (Pierre-Yves David)
phabricator at mercurial-scm.org
Fri Jan 31 17:59:06 EST 2020
marmoute updated this revision to Diff 19789.
REPOSITORY
rHG Mercurial
CHANGES SINCE LAST UPDATE
https://phab.mercurial-scm.org/D7844?vs=19760&id=19789
CHANGES SINCE LAST ACTION
https://phab.mercurial-scm.org/D7844/new/
REVISION DETAIL
https://phab.mercurial-scm.org/D7844
AFFECTED FILES
mercurial/revlogutils/nodemap.py
CHANGE DETAILS
diff --git a/mercurial/revlogutils/nodemap.py b/mercurial/revlogutils/nodemap.py
--- a/mercurial/revlogutils/nodemap.py
+++ b/mercurial/revlogutils/nodemap.py
@@ -309,3 +309,33 @@
return block_map[id(item)]
else:
return _transform_rev(item)
+
+
+def parse_data(data):
+ """parse parse nodemap data into a nodemap Trie"""
+ if (len(data) % S_BLOCK.size) != 0:
+ msg = "nodemap data size is not a multiple of block size (%d): %d"
+ raise error.Abort(msg % (S_BLOCK.size, len(data)))
+ if not data:
+ return Block()
+ block_map = {}
+ for i in range(0, len(data), S_BLOCK.size):
+ block = _parse_block(block_map, data[i : i + S_BLOCK.size])
+ return block
+
+
+def _parse_block(block_map, block_data):
+ """Parse the persisted version of an individual block
+ """
+ block = Block()
+ ondisk_id = len(block_map)
+ block_map[ondisk_id] = block
+ values = S_BLOCK.unpack(block_data)
+ for idx, v in enumerate(values):
+ if v == NO_ENTRY:
+ continue
+ elif v >= 0:
+ block[idx] = block_map[v]
+ else:
+ block[idx] = _transform_rev(v)
+ return block
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