mirror of
https://github.com/urbit/shrub.git
synced 2024-12-23 10:52:12 +03:00
55 lines
1.1 KiB
C
55 lines
1.1 KiB
C
/* j/c/muk.c
|
|
**
|
|
*/
|
|
#include "all.h"
|
|
#include <murmur3.h>
|
|
|
|
/* functions
|
|
*/
|
|
u3_noun
|
|
u3qc_muk(u3_atom seed,
|
|
u3_atom len,
|
|
u3_atom key)
|
|
{
|
|
c3_w seed_w;
|
|
c3_w len_w;
|
|
c3_y *key_y;
|
|
c3_w out_w;
|
|
|
|
c3_assert(u3r_met(5, seed) <= 1);
|
|
c3_assert(u3r_met(0, len) <= 31);
|
|
c3_assert(u3r_met(3, key) <= len);
|
|
|
|
seed_w = u3r_word(0, seed);
|
|
len_w = u3r_word(0, len);
|
|
if (len_w > 0) { /* can't u3a_calloc 0 bytes */
|
|
key_y = u3a_calloc(sizeof(c3_y), len);
|
|
} else {
|
|
key_y = 0;
|
|
}
|
|
u3r_bytes(0, len, key_y, key);
|
|
|
|
MurmurHash3_x86_32(key_y, len, seed_w, &out_w);
|
|
|
|
u3a_free(key_y);
|
|
return u3i_words(1, &out_w);
|
|
}
|
|
|
|
u3_noun
|
|
u3wc_muk(u3_noun cor)
|
|
{
|
|
u3_noun seed, len, key;
|
|
|
|
if ( (c3n == u3r_mean(cor, u3x_sam_2, &seed,
|
|
u3x_sam_6, &len,
|
|
u3x_sam_7, &key, 0)) ||
|
|
(c3n == u3ud(seed)) ||
|
|
(c3n == u3ud(len)) ||
|
|
(c3n == u3ud(key)) )
|
|
{
|
|
return u3m_bail(c3__exit);
|
|
} else {
|
|
return u3qc_muk(seed, len, key);
|
|
}
|
|
}
|