int pn_post_frame(pn_dispatcher_t *disp, uint16_t ch, const char *fmt, ...) { va_list ap; va_start(ap, fmt); pn_data_clear(disp->output_args); int err = pn_data_vfill(disp->output_args, fmt, ap); va_end(ap); if (err) { pn_transport_logf(disp->transport, "error posting frame: %s, %s: %s", fmt, pn_code(err), pn_error_text(pn_data_error(disp->output_args))); return PN_ERR; } pn_do_trace(disp, ch, OUT, disp->output_args, disp->output_payload, disp->output_size); encode_performatives: pn_buffer_clear( disp->frame ); pn_bytes_t buf = pn_buffer_bytes( disp->frame ); buf.size = pn_buffer_available( disp->frame ); ssize_t wr = pn_data_encode( disp->output_args, buf.start, buf.size ); if (wr < 0) { if (wr == PN_OVERFLOW) { pn_buffer_ensure( disp->frame, pn_buffer_available( disp->frame ) * 2 ); goto encode_performatives; } pn_transport_logf(disp->transport, "error posting frame: %s", pn_code(wr)); return PN_ERR; } pn_frame_t frame = {disp->frame_type}; frame.channel = ch; frame.payload = buf.start; frame.size = wr; size_t n; while (!(n = pn_write_frame(disp->output + disp->available, disp->capacity - disp->available, frame))) { disp->capacity *= 2; disp->output = (char *) realloc(disp->output, disp->capacity); } disp->output_frames_ct += 1; if (disp->trace & PN_TRACE_RAW) { pn_string_set(disp->scratch, "RAW: \""); pn_quote(disp->scratch, disp->output + disp->available, n); pn_string_addf(disp->scratch, "\""); pn_transport_log(disp->transport, pn_string_get(disp->scratch)); } disp->available += n; return 0; }
size_t pn_buffer_head_space(pn_buffer_t *buf) { if (pn_buffer_wrapped(buf)) { return pn_buffer_available(buf); } else { return pn_buffer_head(buf); } }
size_t pn_buffer_tail_space(pn_buffer_t *buf) { if (pn_buffer_wrapped(buf)) { return pn_buffer_available(buf); } else { return buf->capacity - pn_buffer_tail(buf); } }
int pn_buffer_ensure(pn_buffer_t *buf, size_t size) { size_t old_capacity = buf->capacity; size_t old_head = pn_buffer_head(buf); bool wrapped = pn_buffer_wrapped(buf); while (pn_buffer_available(buf) < size) { buf->capacity = 2*(buf->capacity ? buf->capacity : 16); } if (buf->capacity != old_capacity) { buf->bytes = (char *) realloc(buf->bytes, buf->capacity); if (wrapped) { size_t n = old_capacity - old_head; memmove(buf->bytes + buf->capacity - n, buf->bytes + old_head, n); buf->start = buf->capacity - n; } } return 0; }
int pn_post_transfer_frame(pn_dispatcher_t *disp, uint16_t ch, uint32_t handle, pn_sequence_t id, const pn_bytes_t *tag, uint32_t message_format, bool settled, bool more, pn_sequence_t frame_limit) { bool more_flag = more; int framecount = 0; // create preformatives, assuming 'more' flag need not change compute_performatives: pn_data_clear(disp->output_args); int err = pn_data_fill(disp->output_args, "DL[IIzIoo]", TRANSFER, handle, id, tag->size, tag->start, message_format, settled, more_flag); if (err) { pn_transport_logf(disp->transport, "error posting transfer frame: %s: %s", pn_code(err), pn_error_text(pn_data_error(disp->output_args))); return PN_ERR; } do { // send as many frames as possible without changing the 'more' flag... encode_performatives: pn_buffer_clear( disp->frame ); pn_bytes_t buf = pn_buffer_bytes( disp->frame ); buf.size = pn_buffer_available( disp->frame ); ssize_t wr = pn_data_encode(disp->output_args, buf.start, buf.size); if (wr < 0) { if (wr == PN_OVERFLOW) { pn_buffer_ensure( disp->frame, pn_buffer_available( disp->frame ) * 2 ); goto encode_performatives; } pn_transport_logf(disp->transport, "error posting frame: %s", pn_code(wr)); return PN_ERR; } buf.size = wr; // check if we need to break up the outbound frame size_t available = disp->output_size; if (disp->remote_max_frame) { if ((available + buf.size) > disp->remote_max_frame - 8) { available = disp->remote_max_frame - 8 - buf.size; if (more_flag == false) { more_flag = true; goto compute_performatives; // deal with flag change } } else if (more_flag == true && more == false) { // caller has no more, and this is the last frame more_flag = false; goto compute_performatives; } } if (pn_buffer_available( disp->frame ) < (available + buf.size)) { // not enough room for payload - try again... pn_buffer_ensure( disp->frame, available + buf.size ); goto encode_performatives; } pn_do_trace(disp, ch, OUT, disp->output_args, disp->output_payload, available); memmove( buf.start + buf.size, disp->output_payload, available); disp->output_payload += available; disp->output_size -= available; buf.size += available; pn_frame_t frame = {disp->frame_type}; frame.channel = ch; frame.payload = buf.start; frame.size = buf.size; size_t n; while (!(n = pn_write_frame(disp->output + disp->available, disp->capacity - disp->available, frame))) { disp->capacity *= 2; disp->output = (char *) realloc(disp->output, disp->capacity); } disp->output_frames_ct += 1; framecount++; if (disp->trace & PN_TRACE_RAW) { pn_string_set(disp->scratch, "RAW: \""); pn_quote(disp->scratch, disp->output + disp->available, n); pn_string_addf(disp->scratch, "\""); pn_transport_log(disp->transport, pn_string_get(disp->scratch)); } disp->available += n; } while (disp->output_size > 0 && framecount < frame_limit); disp->output_payload = NULL; return framecount; }