Obsolete hasval.c

scr-persistent-collective
Salvatore Filippone 6 years ago
parent af9d5941ab
commit cd355ea1f0

@ -1,49 +0,0 @@
#include <stdint.h>
/*
This is based on the djb2 hashing algorithm
see e.g. http://www.cse.yorku.ca/~oz/hash.html
*/
#define IVAL 5381
#define H32MASK 0x7FFFFFFF
#define H64MASK 0x7FFFFFFFFFFFFFFF
#define BMASK 0xFF
int32_t psb_c_hashval_32(int32_t inkey)
{
uint32_t key, val, i;
key = inkey;
val = IVAL;
for (i=0; i<4; i++) {
val = ((val<<5)+val)+(key & BMASK);
key >>= 8;
}
val &= H32MASK;
return(val);
}
int64_t psb_c_hashval_64(int64_t inkey)
{
uint64_t key, val, i;
key = inkey;
val = IVAL;
for (i=0; i<8; i++) {
val = ((val<<5)+val)+(key & BMASK);
key >>= 8;
}
val &= H64MASK;
return(val);
}
int32_t psb_c_hashval_64_32(int64_t inkey)
{
uint32_t key, val, i;
key = inkey;
val = IVAL;
for (i=0; i<8; i++) {
val = ((val<<5)+val)+(key & BMASK);
key >>= 8;
}
val &= H32MASK;
return(val);
}
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