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/*****************************************************************************/
/*
* testcrc.c -- Test the AMSAT CRC table.
*
* Copyright (C) 2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Please note that the GPL allows you to use the driver, NOT the radio.
* In order to use the radio, you need a license from the communications
* authority of your country.
*
*/
/*****************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "p3dtbl.h"
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
/* --------------------------------------------------------------------- */
#define BLOCKSZ 512
static int testone(void)
{
unsigned char data[BLOCKSZ];
unsigned int i, j;
u_int16_t crc1 = 0xffff, crc2 = 0xffff;
/* fill block with random bytes */
for (i = 0; i < BLOCKSZ; i++)
data[i] = random();
/* compute conventional CRC */
for (i = 0; i < BLOCKSZ; i++)
for (j = 0; j < 8; j++) {
crc1 = (crc1 << 1) | (((crc1 >> 15) ^ (data[i] >> (7-j))) & 1);
if (crc1 & 1)
crc1 ^= (1 << 5) | (1 << 12);
}
/* compute table CRC */
for (i = 0; i < BLOCKSZ; i++)
crc2 = (crc2 << 8) ^ amsat_crc[((crc2 >> 8) ^ data[i]) & 0xff];
if (crc1 == crc2)
return 0;
printf("CRC error! conventional CRC 0x%04x, table CRC 0x%04x\n", crc1, crc2);
for (i = 0; i < BLOCKSZ; i++) {
if (!(i & 15))
printf("\n%04x:", i);
printf(" %02x", data[i]);
}
printf("\n");
return -1;
}
/* --------------------------------------------------------------------- */
int main(int argc, char *argv[])
{
unsigned int i;
srandom(time(NULL));
for (i = 0; i < 131072; i++) {
if (!(i & 1023)) {
printf("%u\r", i);
fflush(stdout);
}
if (testone())
exit(1);
}
printf("OK\n");
exit(0);
}
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