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changed hcl_hash_bytes() to sdbm hash

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hyung-hwan
2019-03-01 07:51:53 +00:00
parent aab34cb83f
commit fc183e19a4
1 changed files with 7 additions and 1 deletions
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8
hcl/lib/utl.c
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@ -41,7 +41,13 @@ hcl_oow_t hcl_hash_bytes (const hcl_oob_t* ptr, hcl_oow_t len)
const hcl_uint8_t* bp, * be; const hcl_uint8_t* bp, * be;
bp = ptr; be = bp + len; bp = ptr; be = bp + len;
while (bp < be) h = h * 31 + *bp++;
/* this hash doesn't produce good distribution */
/*while (bp < be) h = h * 31 + *bp++; */
/* SDBM hash is known to produce good overall distribution
* for many different data sets */
while (bp < be) h = (h << 6) + (h << 16) - h + *bp++;
/* constrain the hash value to be representable in a small integer /* constrain the hash value to be representable in a small integer
* for convenience sake */ * for convenience sake */