1 files changed, 77 insertions, 0 deletions
diff --git a/examples/gf_example_5.c b/examples/gf_example_5.c
new file mode 100644
index 0000000..8e7dd4e
--- /dev/null
+++ b/examples/gf_example_5.c
@@ -0,0 +1,77 @@
+/*
+ * 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));
+  }
+}