140 lines
3.4 KiB
C
140 lines
3.4 KiB
C
#include "hash_state.h"
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#include <stdlib.h>
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#include <assert.h>
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#include <limits.h>
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#include <string.h>
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//#define DEBUG
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#include "debug.h"
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const char *hash_names[] = { "jenkins", "djb2", "sdbm", "fnv", "glib", "pjw", NULL };
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hash_state_t *hash_state_new(CMPH_HASH hashfunc, uint32 hashsize)
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{
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hash_state_t *state = NULL;
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switch (hashfunc)
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{
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case HASH_JENKINS:
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DEBUGP("Jenkins function - %u\n", hashsize);
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state = (hash_state_t *)jenkins_state_new(hashsize);
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DEBUGP("Jenkins function created\n");
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break;
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case HASH_DJB2:
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state = (hash_state_t *)djb2_state_new();
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break;
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case HASH_SDBM:
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state = (hash_state_t *)sdbm_state_new();
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break;
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case HASH_FNV:
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state = (hash_state_t *)fnv_state_new();
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break;
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default:
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assert(0);
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}
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state->hashfunc = hashfunc;
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return state;
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}
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uint32 hash(hash_state_t *state, const char *key, uint32 keylen)
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{
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switch (state->hashfunc)
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{
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case HASH_JENKINS:
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return jenkins_hash((jenkins_state_t *)state, key, keylen);
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case HASH_DJB2:
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return djb2_hash((djb2_state_t *)state, key, keylen);
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case HASH_SDBM:
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return sdbm_hash((sdbm_state_t *)state, key, keylen);
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case HASH_FNV:
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return fnv_hash((fnv_state_t *)state, key, keylen);
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default:
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assert(0);
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}
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assert(0);
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return 0;
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}
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void hash_state_dump(hash_state_t *state, char **buf, uint32 *buflen)
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{
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char *algobuf;
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switch (state->hashfunc)
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{
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case HASH_JENKINS:
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jenkins_state_dump((jenkins_state_t *)state, &algobuf, buflen);
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if (*buflen == UINT_MAX) return;
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break;
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case HASH_DJB2:
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djb2_state_dump((djb2_state_t *)state, &algobuf, buflen);
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if (*buflen == UINT_MAX) return;
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break;
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case HASH_SDBM:
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sdbm_state_dump((sdbm_state_t *)state, &algobuf, buflen);
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if (*buflen == UINT_MAX) return;
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break;
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case HASH_FNV:
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fnv_state_dump((fnv_state_t *)state, &algobuf, buflen);
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if (*buflen == UINT_MAX) return;
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break;
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default:
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assert(0);
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}
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*buf = malloc(strlen(hash_names[state->hashfunc]) + 1 + *buflen);
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memcpy(*buf, hash_names[state->hashfunc], strlen(hash_names[state->hashfunc]) + 1);
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DEBUGP("Algobuf is %u\n", *(uint32 *)algobuf);
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memcpy(*buf + strlen(hash_names[state->hashfunc]) + 1, algobuf, *buflen);
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*buflen = (uint32)strlen(hash_names[state->hashfunc]) + 1 + *buflen;
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free(algobuf);
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return;
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}
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hash_state_t *hash_state_load(const char *buf, uint32 buflen)
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{
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uint32 i;
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uint32 offset;
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CMPH_HASH hashfunc = HASH_COUNT;
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for (i = 0; i < HASH_COUNT; ++i)
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{
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if (strcmp(buf, hash_names[i]) == 0)
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{
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hashfunc = i;
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break;
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}
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}
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if (hashfunc == HASH_COUNT) return NULL;
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offset = (uint32)strlen(hash_names[hashfunc]) + 1;
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switch (hashfunc)
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{
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case HASH_JENKINS:
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return (hash_state_t *)jenkins_state_load(buf + offset, buflen - offset);
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case HASH_DJB2:
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return (hash_state_t *)djb2_state_load(buf + offset, buflen - offset);
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case HASH_SDBM:
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return (hash_state_t *)sdbm_state_load(buf + offset, buflen - offset);
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case HASH_FNV:
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return (hash_state_t *)fnv_state_load(buf + offset, buflen - offset);
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default:
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return NULL;
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}
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return NULL;
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}
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void hash_state_destroy(hash_state_t *state)
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{
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switch (state->hashfunc)
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{
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case HASH_JENKINS:
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jenkins_state_destroy((jenkins_state_t *)state);
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break;
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case HASH_DJB2:
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djb2_state_destroy((djb2_state_t *)state);
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break;
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case HASH_SDBM:
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sdbm_state_destroy((sdbm_state_t *)state);
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break;
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case HASH_FNV:
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fnv_state_destroy((fnv_state_t *)state);
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break;
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default:
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assert(0);
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}
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return;
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}
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