girepository/cmph/djb2_hash.c

   1 #include "djb2_hash.h"
   2 #include <stdlib.h>
   3
   4 djb2_state_t *djb2_state_new()
   5 {
   6         djb2_state_t *state = (djb2_state_t *)malloc(sizeof(djb2_state_t));
   7         state->hashfunc = CMPH_HASH_DJB2;
   8         return state;
   9 }
  10
  11 void djb2_state_destroy(djb2_state_t *state)
  12 {
  13         free(state);
  14 }
  15
  16 cmph_uint32 djb2_hash(djb2_state_t *state, const char *k, cmph_uint32 keylen)
  17 {
  18         register cmph_uint32 hash = 5381;
  19         const unsigned char *ptr = (unsigned char *)k;
  20         cmph_uint32 i = 0;
  21         while (i < keylen)
  22         {
  23                 hash = hash*33 ^ *ptr;
  24                 ++ptr, ++i;
  25         }
  26         return hash;
  27 }
  28
  29
  30 void djb2_state_dump(djb2_state_t *state, char **buf, cmph_uint32 *buflen)
  31 {
  32         *buf = NULL;
  33         *buflen = 0;
  34         return;
  35 }
  36
  37 djb2_state_t *djb2_state_copy(djb2_state_t *src_state)
  38 {
  39         djb2_state_t *dest_state = (djb2_state_t *)malloc(sizeof(djb2_state_t));
  40         dest_state->hashfunc = src_state->hashfunc;
  41         return dest_state;
  42 }
  43
  44 djb2_state_t *djb2_state_load(const char *buf, cmph_uint32 buflen)
  45 {
  46         djb2_state_t *state = (djb2_state_t *)malloc(sizeof(djb2_state_t));
  47         state->hashfunc = CMPH_HASH_DJB2;
  48         return state;
  49 }