plugins/ctf/common/utils/utils.c

   1 /*
   2  * Babeltrace - CTF Utils
   3  *
   4  * Copyright (c) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  19  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  22  * SOFTWARE.
  23  */
  24
  25 #define BT_LOG_TAG "PLUGIN-CTF-UTILS"
  26 #include "logging.h"
  27
  28 #include "utils.h"
  29
  30 struct bt_ctf_stream_class *ctf_utils_stream_class_from_packet_header(
  31                 struct bt_ctf_trace *trace,
  32                 struct bt_ctf_field *packet_header_field)
  33 {
  34         struct bt_ctf_field *stream_id_field = NULL;
  35         struct bt_ctf_stream_class *stream_class = NULL;
  36         uint64_t stream_id = -1ULL;
  37         int ret;
  38
  39         if (!packet_header_field) {
  40                 goto single_stream_class;
  41         }
  42
  43         stream_id_field = bt_ctf_field_structure_get_field_by_name(
  44                 packet_header_field, "stream_id");
  45         if (!stream_id_field) {
  46                 goto single_stream_class;
  47         }
  48
  49         ret = bt_ctf_field_unsigned_integer_get_value(stream_id_field,
  50                 &stream_id);
  51         if (ret) {
  52                 stream_id = -1ULL;
  53         }
  54
  55         if (stream_id == -1ULL) {
  56 single_stream_class:
  57                 /* Single stream class */
  58                 if (bt_ctf_trace_get_stream_class_count(trace) == 0) {
  59                         goto end;
  60                 }
  61
  62                 stream_class = bt_ctf_trace_get_stream_class_by_index(trace, 0);
  63         } else {
  64                 stream_class = bt_ctf_trace_get_stream_class_by_id(trace,
  65                         stream_id);
  66         }
  67
  68 end:
  69         bt_put(stream_id_field);
  70         return stream_class;
  71 }