C++ (Cpp) digestset_isin Examples

Example #1

File: unittest_container.c Project: FredericJacobs/obfsproxy-c

/** Run unit tests for digest set code (implemented as a hashtable or as a
 * bloom filter) */
static void
test_container_digestset(void *unused)
{
  smartlist_t *included = smartlist_create();
  char d[SHA256_LENGTH];
  int i;
  int ok = 1;
  int false_positives = 0;
  digestset_t *set = NULL;

  for (i = 0; i < 1000; ++i) {
    random_bytes((uchar *)d, SHA256_LENGTH);
    smartlist_add(included, xmemdup(d, SHA256_LENGTH));
  }
  set = digestset_new(1000);
  SMARTLIST_FOREACH(included, const char *, cp,
                    if (digestset_isin(set, cp))
                      ok = 0);
  tt_assert(ok);
  SMARTLIST_FOREACH(included, const char *, cp,
                    digestset_add(set, cp));
  SMARTLIST_FOREACH(included, const char *, cp,
                    if (!digestset_isin(set, cp))
                      ok = 0);
  tt_assert(ok);
  for (i = 0; i < 1000; ++i) {
    random_bytes((uchar *)d, SHA256_LENGTH);
    if (digestset_isin(set, d))
      ++false_positives;
  }
  tt_assert(false_positives < 50); /* Should be far lower. */

 end:
  if (set)
    digestset_free(set);
  SMARTLIST_FOREACH(included, char *, cp, free(cp));
  smartlist_free(included);
}

Example #2

File: bench.c Project: adambregenzer/tor_android

/** Run digestmap_t performance benchmarks. */
static void
bench_dmap(void)
{
  smartlist_t *sl = smartlist_new();
  smartlist_t *sl2 = smartlist_new();
  uint64_t start, end, pt2, pt3, pt4;
  int iters = 8192;
  const int elts = 4000;
  const int fpostests = 100000;
  char d[20];
  int i,n=0, fp = 0;
  digestmap_t *dm = digestmap_new();
  digestset_t *ds = digestset_new(elts);

  for (i = 0; i < elts; ++i) {
    crypto_rand(d, 20);
    smartlist_add(sl, tor_memdup(d, 20));
  }
  for (i = 0; i < elts; ++i) {
    crypto_rand(d, 20);
    smartlist_add(sl2, tor_memdup(d, 20));
  }
  printf("nbits=%d\n", ds->mask+1);

  reset_perftime();

  start = perftime();
  for (i = 0; i < iters; ++i) {
    SMARTLIST_FOREACH(sl, const char *, cp, digestmap_set(dm, cp, (void*)1));
  }
  pt2 = perftime();
  printf("digestmap_set: %.2f ns per element\n",
         NANOCOUNT(start, pt2, iters*elts));

  for (i = 0; i < iters; ++i) {
    SMARTLIST_FOREACH(sl, const char *, cp, digestmap_get(dm, cp));
    SMARTLIST_FOREACH(sl2, const char *, cp, digestmap_get(dm, cp));
  }
  pt3 = perftime();
  printf("digestmap_get: %.2f ns per element\n",
         NANOCOUNT(pt2, pt3, iters*elts*2));

  for (i = 0; i < iters; ++i) {
    SMARTLIST_FOREACH(sl, const char *, cp, digestset_add(ds, cp));
  }
  pt4 = perftime();
  printf("digestset_add: %.2f ns per element\n",
         NANOCOUNT(pt3, pt4, iters*elts));

  for (i = 0; i < iters; ++i) {
    SMARTLIST_FOREACH(sl, const char *, cp, n += digestset_isin(ds, cp));
    SMARTLIST_FOREACH(sl2, const char *, cp, n += digestset_isin(ds, cp));
  }
  end = perftime();
  printf("digestset_isin: %.2f ns per element.\n",
         NANOCOUNT(pt4, end, iters*elts*2));
  /* We need to use this, or else the whole loop gets optimized out. */
  printf("Hits == %d\n", n);

  for (i = 0; i < fpostests; ++i) {
    crypto_rand(d, 20);
    if (digestset_isin(ds, d)) ++fp;
  }
  printf("False positive rate on digestset: %.2f%%\n",
         (fp/(double)fpostests)*100);

  digestmap_free(dm, NULL);
  digestset_free(ds);
  SMARTLIST_FOREACH(sl, char *, cp, tor_free(cp));
  SMARTLIST_FOREACH(sl2, char *, cp, tor_free(cp));
  smartlist_free(sl);
  smartlist_free(sl2);
}