7743   ssize_t payloadlen;  in nghttp2_session_pack_data()  local
7754     payloadlen = session->callbacks.read_length_callback(  in nghttp2_session_pack_data()
7759     DEBUGF("send: read_length_callback=%zd\n", payloadlen);  in nghttp2_session_pack_data()
7761     payloadlen = nghttp2_session_enforce_flow_control_limits(session, stream,  in nghttp2_session_pack_data()
7762                                                              payloadlen);  in nghttp2_session_pack_data()
7764     DEBUGF("send: read_length_callback after flow control=%zd\n", payloadlen);  in nghttp2_session_pack_data()
7766     if (payloadlen <= 0) {  in nghttp2_session_pack_data()
7770     if ((size_t)payloadlen > nghttp2_buf_avail(buf)) {  in nghttp2_session_pack_data()
7774                                 (size_t)(NGHTTP2_FRAME_HDLEN + 1 + payloadlen));  in nghttp2_session_pack_data()
7780         payloadlen = (ssize_t)datamax;  in nghttp2_session_pack_data()
7782         DEBUGF("send: use safe limit payloadlen=%zd", payloadlen);  in nghttp2_session_pack_data()
7789     datamax = (size_t)payloadlen;  in nghttp2_session_pack_data()
7796   payloadlen = aux_data->data_prd.read_callback(  in nghttp2_session_pack_data()
7800   if (payloadlen == NGHTTP2_ERR_DEFERRED ||  in nghttp2_session_pack_data()
7801       payloadlen == NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE ||  in nghttp2_session_pack_data()
7802       payloadlen == NGHTTP2_ERR_PAUSE) {  in nghttp2_session_pack_data()
7804            nghttp2_strerror((int)payloadlen));  in nghttp2_session_pack_data()
7806     return (int)payloadlen;  in nghttp2_session_pack_data()
7809   if (payloadlen < 0 || datamax < (size_t)payloadlen) {  in nghttp2_session_pack_data()
7814   buf->last = buf->pos + payloadlen;  in nghttp2_session_pack_data()
7840   frame->hd.length = (size_t)payloadlen;  in nghttp2_session_pack_data()
7852   frame->data.padlen = (size_t)(padded_payloadlen - payloadlen);  in nghttp2_session_pack_data()