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revlog: compress sidedata in `_writeentry`
authorPierre-Yves David <pierre-yves.david@octobus.net>
Mon, 03 May 2021 23:14:48 +0200
changeset 47258 c4dbb7636a12
parent 47257 87d057137f82
child 47259 07641bafa646
revlog: compress sidedata in `_writeentry` When appropriate we store the sidedata in a compressed form. Differential Revision: https://phab.mercurial-scm.org/D10655
mercurial/revlog.py file | annotate | diff | comparison | revisions 
--- a/mercurial/revlog.py	Mon May 03 22:48:31 2021 +0200
+++ b/mercurial/revlog.py	Mon May 03 23:14:48 2021 +0200
@@ -2537,6 +2537,22 @@
             sidedata_compression_mode = COMP_MODE_PLAIN
             serialized_sidedata = sidedatautil.serialize_sidedata(sidedata)
             sidedata_offset = offset + deltainfo.deltalen
+            h, comp_sidedata = self.compress(serialized_sidedata)
+            if (
+                h != b'u'
+                and comp_sidedata[0:1] != b'\0'
+                and len(comp_sidedata) < len(serialized_sidedata)
+            ):
+                assert not h
+                if (
+                    comp_sidedata[0:1]
+                    == self._docket.default_compression_header
+                ):
+                    sidedata_compression_mode = COMP_MODE_DEFAULT
+                    serialized_sidedata = comp_sidedata
+                else:
+                    sidedata_compression_mode = COMP_MODE_INLINE
+                    serialized_sidedata = comp_sidedata
         else:
             serialized_sidedata = b""
             # Don't store the offset if the sidedata is empty, that way
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