gf_example_5.c 1.75 KB
``````/*
* GF-Complete: A Comprehensive Open Source Library for Galois Field Arithmetic
* James S. Plank, Ethan L. Miller, Kevin M. Greenan,
* Benjamin A. Arnold, John A. Burnum, Adam W. Disney, Allen C. McBride.
*
* gf_example_5.c
*
* Demonstrating altmap and extract_word
*/

#include <stdio.h>
#include <getopt.h>
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>

#include "gf_complete.h"
#include "gf_rand.h"

void usage(char *s)
{
fprintf(stderr, "usage: gf_example_5\n");
exit(1);
}

int main(int argc, char **argv)
{
uint16_t *a, *b;
int i, j;
gf_t gf;

if (gf_init_hard(&gf, 16, GF_MULT_SPLIT_TABLE, GF_REGION_ALTMAP, GF_DIVIDE_DEFAULT,
0, 16, 4, NULL, NULL) == 0) {
fprintf(stderr, "gf_init_hard failed\n");
exit(1);
}

a = (uint16_t *) malloc(200);
b = (uint16_t *) malloc(200);

a += 6;
b += 6;

MOA_Seed(0);

for (i = 0; i < 30; i++) a[i] = MOA_Random_W(16, 1);

gf.multiply_region.w32(&gf, a, b, 0x1234, 30*2, 0);

printf("a: 0x%lx    b: 0x%lx\n", (unsigned long) a, (unsigned long) b);

for (i = 0; i < 30; i += 10) {
printf("\n");
printf("  ");
for (j = 0; j < 10; j++) printf(" %4d", i+j);
printf("\n");

printf("a:");
for (j = 0; j < 10; j++) printf(" %04x", a[i+j]);
printf("\n");

printf("b:");
for (j = 0; j < 10; j++) printf(" %04x", b[i+j]);
printf("\n");
printf("\n");
}

for (i = 0; i < 15; i ++) {
printf("Word %2d: 0x%04x * 0x1234 = 0x%04x    ", i,
gf.extract_word.w32(&gf, a, 30*2, i),
gf.extract_word.w32(&gf, b, 30*2, i));
printf("Word %2d: 0x%04x * 0x1234 = 0x%04x\n", i+15,
gf.extract_word.w32(&gf, a, 30*2, i+15),
gf.extract_word.w32(&gf, b, 30*2, i+15));
}
return 0;
}
``````