mdw@git.distorted.org.uk Git - mLib/blob - hash/t/hash-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 "crc32.h"
  31 #include "unihash.h"
  32 #include "tvec.h"
  33
  34 /*----- Main code ---------------------------------------------------------*/
  35
  36 enum {
  37   RH, NROUT,
  38   RK = NROUT, RM, NREG
  39 };
  40
  41 struct step { size_t s; };
  42
  43 static void test_crc32(const struct tvec_reg *in, struct tvec_reg *out,
  44                        void *ctx)
  45 {
  46   const struct step *step = ctx;
  47   const unsigned char *p = in[RM].v.bytes.p; size_t sz = in[RM].v.bytes.sz;
  48   uint32 h;
  49
  50   if (!step)
  51     out[RH].v.u = crc32(0, p, sz);
  52   else {
  53     for (h = 0; sz > step->s; p += step->s, sz -= step->s)
  54       h = crc32(h, p, step->s);
  55     out[RH].v.u = crc32(h, p, sz);
  56   }
  57 }
  58
  59 static void bench_crc32(const struct tvec_reg *in, struct tvec_reg *out,
  60                         void *ctx)
  61   { crc32(0, in[RM].v.bytes.p, in[RM].v.bytes.sz); }
  62
  63 static void test_unihash(const struct tvec_reg *in, struct tvec_reg *out,
  64                          void *ctx)
  65 {
  66   const struct step *step = ctx;
  67   unihash_info ui;
  68   const unsigned char *p = in[RM].v.bytes.p; size_t sz = in[RM].v.bytes.sz;
  69   uint32 h;
  70
  71   unihash_setkey(&ui, in[RK].v.u);
  72   if (!step)
  73     out[RH].v.u = unihash(&ui, p, sz);
  74   else {
  75     for (h = UNIHASH_INIT(&ui); sz > step->s; p += step->s, sz -= step->s)
  76       h = unihash_hash(&ui, h, p, step->s);
  77     out[RH].v.u = unihash_hash(&ui, h, p, sz);
  78   }
  79 }
  80
  81 static void bench_unihash(const struct tvec_reg *in, struct tvec_reg *out,
  82                           void *ctx)
  83   { unihash_hash(ctx, 0, in[RM].v.bytes.p, in[RM].v.bytes.sz); }
  84 static void setup_unihash(struct tvec_state *tv,
  85                           const struct tvec_env *env, void *pctx, void *ctx)
  86   { unihash_setkey(ctx, 0); }
  87 static const struct tvec_env unihash_benchenv =
  88   { sizeof(unihash_info), setup_unihash, 0, 0 };
  89
  90 static void run_step(struct tvec_state *tv, tvec_testfn *fn, void *ctx)
  91 {
  92   static const size_t steps[] = { 1, 5, 6, 7, 8, 23 };
  93   struct step step;
  94   size_t i;
  95
  96   fn(tv->in, tv->out, 0);
  97   tvec_check(tv, "whole buffer");
  98
  99   for (i = 0; i < N(steps); i++) {
 100     step.s = steps[i];
 101     fn(tv->in, tv->out, &step);
 102     tvec_check(tv, "step = %lu", (unsigned long)steps[i]);
 103   }
 104 }
 105
 106 static const struct tvec_env step_testenv = { 0, 0, 0, 0, run_step, 0, 0 };
 107
 108 static const struct tvec_regdef unihash_regs[] = {
 109   { "k", RK, &tvty_uint, 0, { &tvrange_u32 } },
 110   { "m", RM, &tvty_bytes, 0 },
 111   { "h", RH, &tvty_uint, 0, { &tvrange_u32 } },
 112   TVEC_ENDREGS
 113 };
 114
 115 static const struct tvec_regdef crc32_regs[] = {
 116   { "m", RM, &tvty_bytes, 0 },
 117   { "h", RH, &tvty_uint, 0, { &tvrange_u32 } },
 118   TVEC_ENDREGS
 119 };
 120
 121 static const struct tvec_regdef bench_regs[] = {
 122   { "msz", RM, &tvty_buffer, TVRF_ID },
 123   TVEC_ENDREGS
 124 };
 125
 126 static const struct tvec_benchenv crc32_bench =
 127   { TVEC_BENCHINIT, 1, -1, RM, 0 };
 128 static const struct tvec_benchenv unihash_bench =
 129   { TVEC_BENCHINIT, 1, -1, RM, &unihash_benchenv };
 130
 131 static const struct tvec_test tests[] = {
 132   { "crc32", crc32_regs, &step_testenv, test_crc32 },
 133   { "unihash", unihash_regs, &step_testenv, test_unihash },
 134   { "crc32-bench", bench_regs, &crc32_bench._env, bench_crc32 },
 135   { "unihash-bench", bench_regs, &unihash_bench._env, bench_unihash },
 136   TVEC_ENDTESTS
 137 };
 138
 139 static const struct tvec_config testconfig =
 140   { tests, NROUT, NREG, sizeof(struct tvec_reg) };
 141
 142 int main(int argc, char *argv[])
 143   { return (tvec_main(argc, argv, &testconfig, 0)); }
 144
 145 /*----- That's all, folks -------------------------------------------------*/