forked from Mirrors/freeswitch
131 lines
3.5 KiB
C
131 lines
3.5 KiB
C
/*
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* SpanDSP - a series of DSP components for telephony
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*
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* crc_tests.c
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*
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* Written by Steve Underwood <steveu@coppice.org>
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*
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* Copyright (C) 2003 Steve Underwood
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2, as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/*! \file */
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/*! \page crc_tests_page CRC tests
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\section crc_tests_page_sec_1 What does it do?
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The CRC tests exercise the ITU-16 and ITU-32 CRC module, and verifies
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correct operation.
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*/
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#if defined(HAVE_CONFIG_H)
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#include "config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "spandsp.h"
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int ref_len;
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uint8_t buf[1000];
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/* Use a local random generator, so the results are consistent across platforms. We have hard coded
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correct results for a message sequence generated by this particular PRNG. */
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static int my_rand(void)
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{
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static int rndnum = 1234567;
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return (rndnum = 1664525U*rndnum + 1013904223U) >> 8;
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}
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/*- End of function --------------------------------------------------------*/
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static int cook_up_msg(uint8_t *buf)
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{
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int i;
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int len;
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/* Use medium length messages, with some randomised length variation. */
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/* TODO: this doesn't exercise extremely short or long messages. */
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len = (my_rand() & 0x3F) + 100;
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for (i = 0; i < len; i++)
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buf[i] = my_rand();
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return len;
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}
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/*- End of function --------------------------------------------------------*/
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int main(int argc, char *argv[])
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{
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int i;
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int j;
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int len;
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uint16_t crc16a;
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uint16_t crc16b;
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printf("CRC module tests\n");
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/* TODO: This doesn't check every function in the module */
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/* Try a few random messages through the CRC logic. */
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printf("Testing the CRC-16 routines\n");
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for (i = 0; i < 100; i++)
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{
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ref_len = cook_up_msg(buf);
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len = crc_itu16_append(buf, ref_len);
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if (!crc_itu16_check(buf, len))
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{
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printf("CRC-16 failure\n");
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exit(2);
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}
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}
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printf("Test passed.\n\n");
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printf("Testing the CRC-16 byte by byte and bit by bit routines\n");
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for (i = 0; i < 100; i++)
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{
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ref_len = cook_up_msg(buf);
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crc16a = 0xFFFF;
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crc16a = crc_itu16_calc(buf, ref_len, crc16a);
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crc16b = 0xFFFF;
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for (j = 0; j < ref_len; j++)
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crc16b = crc_itu16_bits(buf[j], 8, crc16b);
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if (crc16a != crc16b)
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{
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printf("CRC-16 failure\n");
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exit(2);
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}
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}
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printf("Test passed.\n\n");
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printf("Testing the CRC-32 routines\n");
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for (i = 0; i < 100; i++)
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{
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ref_len = cook_up_msg(buf);
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len = crc_itu32_append(buf, ref_len);
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if (!crc_itu32_check(buf, len))
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{
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printf("CRC-32 failure\n");
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exit(2);
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}
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}
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printf("Test passed.\n");
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return 0;
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}
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/*- End of function --------------------------------------------------------*/
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/*- End of file ------------------------------------------------------------*/
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