mdw@git.distorted.org.uk Git - mLib/blob - hash/t/unihash-test.c

   1 /* -*-c-*-
   2  *
   3  * Test driver for universal hashing
   4  *
   5  * (c) 2009 Straylight/Edgeware
   6  */
   7
   8 /*----- Licensing notice --------------------------------------------------*
   9  *
  10  * This file is part of the mLib utilities library.
  11  *
  12  * mLib is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU Library General Public License as
  14  * published by the Free Software Foundation; either version 2 of the
  15  * License, or (at your option) any later version.
  16  *
  17  * mLib is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU Library General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU Library General Public
  23  * License along with mLib; if not, write to the Free
  24  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  25  * MA 02111-1307, USA.
  26  */
  27
  28 /*----- Header files ------------------------------------------------------*/
  29
  30 #include <stdio.h>
  31
  32 #include "unihash.h"
  33 #include "testrig.h"
  34
  35 /*----- Main code ---------------------------------------------------------*/
  36
  37 static int verify(dstr *v)
  38 {
  39   unihash_info ui;
  40   uint32 k;
  41   uint32 h, hh;
  42   size_t n;
  43   int i, c;
  44   const char *p;
  45   int ok = 1;
  46
  47   static const int step[] = { 0, 1, 5, 6, 7, 8, 23, -1 };
  48
  49   /* --- Set up for using this key --- */
  50
  51   k = *(uint32 *)v[0].buf;
  52   h = *(uint32 *)v[2].buf;
  53   unihash_setkey(&ui, k);
  54
  55   /* --- Hash the data a lot --- */
  56
  57   for (i = 0; step[i] >= 0; i++) {
  58     c = step[i];
  59     if (!c)
  60       hh = unihash(&ui, v[1].buf, v[1].len);
  61     else {
  62       hh = UNIHASH_INIT(&ui);
  63       p = v[1].buf;
  64       n = v[1].len;
  65       while (n) {
  66         if (c > n) c = n;
  67         hh = unihash_hash(&ui, hh, p, c);
  68         p += c;
  69         n -= c;
  70       }
  71     }
  72     if (h != hh) {
  73       ok = 0;
  74       fprintf(stderr, "\nunihash failed\n");
  75       fprintf(stderr, "  key = %08lx\n", (unsigned long)k);
  76       fprintf(stderr, "  data = %s\n", v[1].buf);
  77       fprintf(stderr, "  step = %d\n", step[i]);
  78       fprintf(stderr, "  expected = %08lx\n", (unsigned long)h);
  79       fprintf(stderr, "  computed = %08lx\n", (unsigned long)hh);
  80     }
  81   }
  82   return (ok);
  83 }
  84
  85 static const test_chunk tests[] = {
  86   { "hash", verify, { &type_uint32, &type_string, &type_uint32 } },
  87   { 0, 0, { 0 } }
  88 };
  89
  90 int main(int argc, char *argv[])
  91 {
  92   test_run(argc, argv, tests, "unihash.in");
  93   return (0);
  94 }
  95
  96 /*----- That's all, folks -------------------------------------------------*/