static int null_write(BIO *h,char *buf,int num);
static int null_read(BIO *h,char *buf,int size);
static int null_puts(BIO *h,char *str);
static int null_write(BIO *h,char *buf,int num);
static int null_read(BIO *h,char *buf,int size);
static int null_puts(BIO *h,char *str);