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olemorud
2023-04-23 19:39:07 +02:00
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@@ -12,19 +12,19 @@
djb2 string hash djb2 string hash
credits: Daniel J. Bernstein credits: Daniel J. Bernstein
Returns a hash of the string `str`. Returns a hash of the string `str`.
It seems to work well because 33 is coprime to It seems to work well because 33 is coprime to
2^32 and 2^64 (any odd number except 1 is), 2^32 and 2^64 (any odd number except 1 is),
which probably improves the distribution which probably improves the distribution (I'm
(I'm not a mathematician so I can't prove it this). not a mathematician so I can't prove it this).
Multiplying a number n by 33 is the same as Multiplying a number n by 33 is the same as
bitshifting by 5 and adding n, which is faster bitshifting by 5 and adding n, which is faster
than multiplying by, say, 37. Maybe any 2^x±1 than multiplying by, say, 37. Maybe any 2^x±1
are equally good. are equally good.
5381 is a large-ish prime number which are used 5381 is a large-ish prime number which are used
as multipliers in most hash algorithms. as multipliers in most hash algorithms.
*/ */
size_t obj_hash(char const* str) size_t obj_hash(char const* str)
{ {