mirror of
https://github.com/VK3FNG/soundmodem.git
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92 lines
2.5 KiB
C
92 lines
2.5 KiB
C
/*****************************************************************************/
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/*
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* testcrc.c -- Test the AMSAT CRC table.
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*
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* Copyright (C) 2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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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* Please note that the GPL allows you to use the driver, NOT the radio.
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* In order to use the radio, you need a license from the communications
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* authority of your country.
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*
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*/
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/*****************************************************************************/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "p3dtbl.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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/* --------------------------------------------------------------------- */
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#define BLOCKSZ 512
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static int testone(void)
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{
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unsigned char data[BLOCKSZ];
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unsigned int i, j;
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u_int16_t crc1 = 0xffff, crc2 = 0xffff;
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/* fill block with random bytes */
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for (i = 0; i < BLOCKSZ; i++)
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data[i] = random();
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/* compute conventional CRC */
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for (i = 0; i < BLOCKSZ; i++)
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for (j = 0; j < 8; j++) {
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crc1 = (crc1 << 1) | (((crc1 >> 15) ^ (data[i] >> (7-j))) & 1);
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if (crc1 & 1)
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crc1 ^= (1 << 5) | (1 << 12);
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}
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/* compute table CRC */
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for (i = 0; i < BLOCKSZ; i++)
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crc2 = (crc2 << 8) ^ amsat_crc[((crc2 >> 8) ^ data[i]) & 0xff];
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if (crc1 == crc2)
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return 0;
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printf("CRC error! conventional CRC 0x%04x, table CRC 0x%04x\n", crc1, crc2);
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for (i = 0; i < BLOCKSZ; i++) {
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if (!(i & 15))
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printf("\n%04x:", i);
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printf(" %02x", data[i]);
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}
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printf("\n");
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return -1;
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}
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/* --------------------------------------------------------------------- */
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int main(int argc, char *argv[])
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{
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unsigned int i;
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srandom(time(NULL));
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for (i = 0; i < 131072; i++) {
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if (!(i & 1023)) {
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printf("%u\r", i);
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fflush(stdout);
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}
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if (testone())
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exit(1);
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}
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printf("OK\n");
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exit(0);
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}
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