@@@ man wip

[mLib] / hash / t / hash-test.c

/* -*-c-*-
 *
 * Test driver for universal hashing
 *
 * (c) 2009 Straylight/Edgeware
 */

/*----- Licensing notice --------------------------------------------------*
 *
 * This file is part of the mLib utilities library.
 *
 * mLib is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Library General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * mLib is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with mLib; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA 02111-1307, USA.
 */

/*----- Header files ------------------------------------------------------*/

#include "crc32.h"
#include "unihash.h"
#include "tvec.h"

/*----- Main code ---------------------------------------------------------*/

enum {
  RH, NROUT,
  RK = NROUT, RM, NREG
};

struct step { size_t s; };

static void test_crc32(const struct tvec_reg *in, struct tvec_reg *out,
		       void *ctx)
{
  const struct step *step = ctx;
  const unsigned char *p = in[RM].v.bytes.p; size_t sz = in[RM].v.bytes.sz;
  uint32 h;

  if (!step)
    out[RH].v.u = crc32(0, p, sz);
  else {
    for (h = 0; sz > step->s; p += step->s, sz -= step->s)
      h = crc32(h, p, step->s);
    out[RH].v.u = crc32(h, p, sz);
  }
}

static void before_hash(struct tvec_state *tv, void *ctx)
  { tvec_allocbuffer(&tv->in[RM].v); }

static void bench_crc32(const struct tvec_reg *in, struct tvec_reg *out,
			void *ctx)
  { crc32(0, in[RM].v.bytes.p, in[RM].v.bytes.sz); }
static const struct tvec_env crc32_benchenv =
  { 0, 0, 0, before_hash };

static void test_unihash(const struct tvec_reg *in, struct tvec_reg *out,
			 void *ctx)
{
  const struct step *step = ctx;
  unihash_info ui;
  const unsigned char *p = in[RM].v.bytes.p; size_t sz = in[RM].v.bytes.sz;
  uint32 h;

  unihash_setkey(&ui, in[RK].v.u);
  if (!step)
    out[RH].v.u = unihash(&ui, p, sz);
  else {
    for (h = UNIHASH_INIT(&ui); sz > step->s; p += step->s, sz -= step->s)
      h = unihash_hash(&ui, h, p, step->s);
    out[RH].v.u = unihash_hash(&ui, h, p, sz);
  }
}

static void bench_unihash(const struct tvec_reg *in, struct tvec_reg *out,
			  void *ctx)
  { unihash_hash(ctx, 0, in[RM].v.bytes.p, in[RM].v.bytes.sz); }
static void setup_unihash(struct tvec_state *tv,
			  const struct tvec_env *env, void *pctx, void *ctx)
  { tvec_allocbuffer(&tv->in[RM].v); unihash_setkey(ctx, 0); }
static const struct tvec_env unihash_benchenv =
  { sizeof(unihash_info), setup_unihash, 0, before_hash };

static void run_step(struct tvec_state *tv, tvec_testfn *fn, void *ctx)
{
  static const size_t steps[] = { 1, 5, 6, 7, 8, 23 };
  struct step step;
  size_t i;

  fn(tv->in, tv->out, 0);
  tvec_check(tv, "whole buffer");

  for (i = 0; i < N(steps); i++) {
    step.s = steps[i];
    fn(tv->in, tv->out, &step);
    tvec_check(tv, "step = %lu", (unsigned long)steps[i]);
  }
}

static const struct tvec_env step_testenv = { 0, 0, 0, 0, run_step, 0, 0 };

static const struct tvec_regdef unihash_regs[] = {
  { "k", &tvty_uint, RK, 0, { &tvrange_u32 } },
  { "m", &tvty_bytes, RM, 0 },
  { "h", &tvty_uint, RH, 0, { &tvrange_u32 } },
  TVEC_ENDREGS
};

static const struct tvec_regdef crc32_regs[] = {
  { "m", &tvty_bytes, RM, 0 },
  { "h", &tvty_uint, RH, 0, { &tvrange_u32 } },
  TVEC_ENDREGS
};

static const struct tvec_regdef bench_regs[] = {
  { "msz", &tvty_buffer, RM, TVRF_ID },
  TVEC_ENDREGS
};

static const struct tvec_benchenv crc32_bench =
  { TVEC_BENCHINIT, 1, -1, RM, &crc32_benchenv };
static const struct tvec_benchenv unihash_bench =
  { TVEC_BENCHINIT, 1, -1, RM, &unihash_benchenv };

static const struct tvec_test tests[] = {
  { "crc32", crc32_regs, &step_testenv, test_crc32 },
  { "unihash", unihash_regs, &step_testenv, test_unihash },
  { "crc32-bench", bench_regs, &crc32_bench._env, bench_crc32 },
  { "unihash-bench", bench_regs, &unihash_bench._env, bench_unihash },
  TVEC_ENDTESTS
};

static const struct tvec_config testconfig =
  { tests, NROUT, NREG, sizeof(struct tvec_reg) };

int main(int argc, char *argv[])
  { return (tvec_main(argc, argv, &testconfig, 0)); }

/*----- That's all, folks -------------------------------------------------*/