memcpy(fc->extra_header_buf, buf, payload_size);
if (payload_size < g->slice_bytes)
memset(fc->extra_header_buf + payload_size, 0,
memcpy(fc->extra_header_buf, buf, payload_size);
if (payload_size < g->slice_bytes)
memset(fc->extra_header_buf + payload_size, 0,