int StreamPeerSSL bio_read BIO char buf int len if buf NULL len return

int StreamPeerSSL::bio_read( BIO *b, char *buf, int len ) {

	if ( buf == NULL || len <= 0 ) return 0;

	StreamPeerSSL * sp = (StreamPeerSSL*)b->ptr;

	if (sp->base.is_null())
		return 0;



	BIO_clear_retry_flags( b );

	Error err;
	int ret=0;
	if (sp->block) {
		err = sp->base->get_data((const uint8_t*)buf,len);
		if (err==OK)
			ret=len;
	} else {

		err = sp->base->get_partial_data((const uint8_t*)buf,len,ret);
		if (err==OK && ret!=len) {
			BIO_set_retry_write( b );
		}

	}

	return ret;
}