decode_all

static VALUE
ossl_asn1_decode_all(VALUE self, VALUE obj)
{
    VALUE ret;
    unsigned char *p;
    long offset = 0;
    volatile VALUE tmp;

    obj = ossl_to_der_if_possible(obj);
    tmp = rb_str_new4(StringValue(obj));
    p = (unsigned char *)RSTRING_PTR(tmp);
    ret = ossl_asn1_decode0(&p, RSTRING_LEN(tmp), &offset, 0, 0, 0);

    return ret;
}