diff --git a/ffasn1c/main.c b/ffasn1c/main.c
new file mode 100644
index 0000000..62730f5
--- /dev/null
+++ b/ffasn1c/main.c
@@ -0,0 +1,39 @@
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include <asn1defs.h>
+
+#include "rspro.h"
+
+
+static void transcode(const uint8_t *buf, unsigned int len)
+{
+	ASN1Error err;
+	struct RsproPDU *pdu;
+	int rc;
+	char *gserbuf;
+
+	rc = asn1_ber_decode((void **)&pdu, asn1_type_RsproPDU, buf, len, &err);
+	printf("rc=%d\n", rc);
+
+	rc = asn1_gser_encode((uint8_t **) &gserbuf, asn1_type_RsproPDU, pdu);
+	printf("rc=%d\n", rc);
+	printf("%s\n", gserbuf);
+}
+
+int main(int argc, char **argv)
+{
+	uint8_t buf[2048];
+	int fd, rc;
+
+	fd = open(argv[1], O_RDONLY);
+	if (fd < 0)
+		exit(1);
+	rc = read(fd, buf, sizeof(buf));
+	close(fd);
+
+	transcode(buf, rc);
+}