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lib: add cityhash function

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CityHash64 appears to be the fastest available block hashing algorithm
that is good enough for dedupe.  It takes much less CPU than the CRC64
function, and avoids hash-collision problems with file formats that use
CRC64 as an integrity check on 4K block boundaries.

Extracted from git://github.com/google/cityhash with the "CRC" hash
functions (which require Intel/AMD CPU support) removed.  We don't
need those, and they introduce a new (if only theoretical) build-time
dependency.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell
2018-10-15 21:56:49 -04:00
parent 228747a8f8
commit b3a8fcb553
3 changed files with 627 additions and 0 deletions
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lib/Makefile
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@@ -5,6 +5,7 @@ default: libcrucible.a
CRUCIBLE_OBJS = \
chatter.o \
city.o \
cleanup.o \
crc64.o \
error.o \