File: [cvs.NetBSD.org] / src / external / mpl / bind / dist / bin / tests / optional / Attic / lfsr_test.c (download)
Revision 1.1.1.1 (vendor branch), Sun Aug 12 12:07:39 2018 UTC (5 years, 7 months ago) by christos
Branch: ISC
CVS Tags: bind-9-12-2-P1 Changes since 1.1: +0 -0
lines
Import bind-9.12.2-P2 since bind-9.10 (the last BSD version) is
now out of support. The changes since our last version imported
(9.10.7) version are too big to include inline here; please consult
the CHANGES file in this directory.
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/* $NetBSD: lfsr_test.c,v 1.1.1.1 2018/08/12 12:07:39 christos Exp $ */
/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
/*! \file */
#include <config.h>
#include <stdio.h>
#include <isc/lfsr.h>
#include <isc/print.h>
#include <isc/util.h>
isc_uint32_t state[1024 * 64];
int
main(int argc, char **argv) {
isc_lfsr_t lfsr1, lfsr2;
int i;
isc_uint32_t temp;
UNUSED(argc);
UNUSED(argv);
/*
* Verify that returned values are reproducable.
*/
isc_lfsr_init(&lfsr1, 0, 32, 0x80000057U, 0, NULL, NULL);
for (i = 0; i < 32; i++) {
isc_lfsr_generate(&lfsr1, &state[i], 4);
printf("lfsr1: state[%2d] = %08x\n", i, state[i]);
}
isc_lfsr_init(&lfsr1, 0, 32, 0x80000057U, 0, NULL, NULL);
for (i = 0; i < 32; i++) {
isc_lfsr_generate(&lfsr1, &temp, 4);
if (state[i] != temp)
printf("lfsr1: state[%2d] = %08x, "
"but new state is %08x\n",
i, state[i], temp);
}
/*
* Now do the same with skipping.
*/
isc_lfsr_init(&lfsr1, 0, 32, 0x80000057U, 0, NULL, NULL);
for (i = 0; i < 32; i++) {
isc_lfsr_generate(&lfsr1, &state[i], 4);
isc_lfsr_skip(&lfsr1, 32);
printf("lfsr1: state[%2d] = %08x\n", i, state[i]);
}
isc_lfsr_init(&lfsr1, 0, 32, 0x80000057U, 0, NULL, NULL);
for (i = 0; i < 32; i++) {
isc_lfsr_generate(&lfsr1, &temp, 4);
isc_lfsr_skip(&lfsr1, 32);
if (state[i] != temp)
printf("lfsr1: state[%2d] = %08x, "
"but new state is %08x\n",
i, state[i], temp);
}
/*
* Try to find the period of the LFSR.
*
* x^16 + x^5 + x^3 + x^2 + 1
*/
isc_lfsr_init(&lfsr2, 0, 16, 0x00008016U, 0, NULL, NULL);
for (i = 0; i < 32; i++) {
isc_lfsr_generate(&lfsr2, &state[i], 4);
printf("lfsr2: state[%2d] = %08x\n", i, state[i]);
}
isc_lfsr_init(&lfsr2, 0, 16, 0x00008016U, 0, NULL, NULL);
for (i = 0; i < 32; i++) {
isc_lfsr_generate(&lfsr2, &temp, 4);
if (state[i] != temp)
printf("lfsr2: state[%2d] = %08x, "
"but new state is %08x\n",
i, state[i], temp);
}
return (0);
}