lfsr_test.c revision 70e5a7403f0e0a3bd292b8287c5fed5772c15270
f592d2f76cac7115038124c510d2ba3050334b4dEvan Hunt/*
f592d2f76cac7115038124c510d2ba3050334b4dEvan Hunt * Copyright (C) 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC")
f592d2f76cac7115038124c510d2ba3050334b4dEvan Hunt * Copyright (C) 1999-2001 Internet Software Consortium.
f592d2f76cac7115038124c510d2ba3050334b4dEvan Hunt *
f592d2f76cac7115038124c510d2ba3050334b4dEvan Hunt * Permission to use, copy, modify, and/or distribute this software for any
f592d2f76cac7115038124c510d2ba3050334b4dEvan Hunt * purpose with or without fee is hereby granted, provided that the above
f592d2f76cac7115038124c510d2ba3050334b4dEvan Hunt * copyright notice and this permission notice appear in all copies.
f592d2f76cac7115038124c510d2ba3050334b4dEvan Hunt *
f592d2f76cac7115038124c510d2ba3050334b4dEvan Hunt * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
f592d2f76cac7115038124c510d2ba3050334b4dEvan Hunt * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
f592d2f76cac7115038124c510d2ba3050334b4dEvan Hunt * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
f592d2f76cac7115038124c510d2ba3050334b4dEvan Hunt * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
f592d2f76cac7115038124c510d2ba3050334b4dEvan Hunt * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
f592d2f76cac7115038124c510d2ba3050334b4dEvan Hunt * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
f592d2f76cac7115038124c510d2ba3050334b4dEvan Hunt * PERFORMANCE OF THIS SOFTWARE.
f592d2f76cac7115038124c510d2ba3050334b4dEvan Hunt */
f592d2f76cac7115038124c510d2ba3050334b4dEvan Hunt
f592d2f76cac7115038124c510d2ba3050334b4dEvan Hunt/* $Id: lfsr_test.c,v 1.16 2007/06/19 23:46:59 tbox Exp $ */
f592d2f76cac7115038124c510d2ba3050334b4dEvan Hunt
f592d2f76cac7115038124c510d2ba3050334b4dEvan Hunt/*! \file */
#include <config.h>
#include <stdio.h>
#include <isc/lfsr.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);
}