Introduce dedicated unit for mqtt messages

1 files changed, 52 insertions, 0 deletions

diff --git a/message.c b/message.c
new file mode 100644
index 0000000..58ae135
--- /dev/null
+++ b/message.c
@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2023 Mikhail Burakov. This file is part of MQhTTp.
+ *
+ * MQhTTp is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * MQhTTp is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with MQhTTp.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "message.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+struct Message* MessageCreate(const char* topic, size_t topic_size) {
+  struct Message* message = malloc(sizeof(struct Message));
+  if (!message) return NULL;
+  message->topic = malloc(topic_size);
+  if (!message->topic) goto free_message;
+  memcpy(message->topic, topic, topic_size);
+  message->topic_size = topic_size;
+  message->payload = NULL;
+  message->payload_size = 0;
+  return message;
+
+free_message:
+  free(message);
+  return NULL;
+}
+
+int MessageCompare(const void* a, const void* b) {
+  const struct Message* message_a = a;
+  const struct Message* message_b = b;
+  if (message_a->topic_size > message_b->topic_size) return 1;
+  if (message_a->topic_size < message_b->topic_size) return -1;
+  return memcmp(message_a->topic, message_b->topic, message_a->topic_size);
+}
+
+void MessageDestroy(void* message) {
+  struct Message* instance = message;
+  free(instance->payload);
+  free(instance->topic);
+  free(instance);
+}