--- /dev/null
+/* Copyright (c) 2012-2019. The SimGrid Team.
+ * All rights reserved. */
+
+/* This program is free software; you can redistribute it and/or modify it
+ * under the terms of the license (GNU LGPL) which comes with this package. */
+
+#include "routing_table.h"
+#include "node.h"
+#include "simgrid/msg.h"
+
+XBT_LOG_NEW_DEFAULT_CATEGORY(msg_kademlia_routing_table, "Messages specific for this msg example");
+
+/** @brief Initialization of a node routing table. */
+routing_table_t routing_table_init(unsigned int node_id)
+{
+ routing_table_t table = xbt_new(s_routing_table_t, 1);
+ table->buckets = xbt_new(s_bucket_t, identifier_size + 1);
+ for (unsigned int i = 0; i < identifier_size + 1; i++) {
+ table->buckets[i].nodes = xbt_dynar_new(sizeof(unsigned int), NULL);
+ table->buckets[i].id = i;
+ }
+ table->id = node_id;
+ return table;
+}
+
+/** @brief Frees the routing table */
+void routing_table_free(routing_table_t table)
+{
+ unsigned int i;
+ //Free the buckets.
+ for (i = 0; i <= identifier_size; i++) {
+ xbt_dynar_free(&table->buckets[i].nodes);
+ }
+ xbt_free(table->buckets);
+ xbt_free(table);
+}
+
+/** Returns if the routing table contains the id. */
+unsigned int routing_table_contains(routing_table_t table, unsigned int node_id)
+{
+ bucket_t bucket = routing_table_find_bucket(table, node_id);
+ return bucket_contains(bucket, node_id);
+}
+
+/**@brief prints the routing table, to debug stuff. */
+void routing_table_print(routing_table_t table)
+{
+ unsigned int j;
+ unsigned int value;
+ XBT_INFO("Routing table of %08x:", table->id);
+
+ for (unsigned int i = 0; i <= identifier_size; i++) {
+ if (!xbt_dynar_is_empty(table->buckets[i].nodes)) {
+ XBT_INFO("Bucket number %u: ", i);
+ xbt_dynar_foreach(table->buckets[i].nodes, j, value) {
+ XBT_INFO("Element %u: %08x", j, value);
+ }
+ }
+ }
+}
+
+/** @brief Finds an identifier in a bucket and returns its position or returns -1 if it doesn't exists
+ * @param bucket the bucket in which we try to find our identifier
+ * @param id the id
+ */
+unsigned int bucket_find_id(bucket_t bucket, unsigned int id)
+{
+ unsigned int i;
+ unsigned int current_id;
+ xbt_dynar_foreach(bucket->nodes, i, current_id){
+ if (id == current_id){
+ return i;
+ }
+ }
+ return -1;
+}
+
+/** Returns if the bucket contains an identifier. */
+unsigned int bucket_contains(bucket_t bucket, unsigned int id)
+{
+ return xbt_dynar_member(bucket->nodes, &id);
+}
+
+/** @brief Finds the corresponding bucket in a routing table for a given identifier
+ * @param table the routing table
+ * @param id the identifier
+ * @return the bucket in which the the identifier would be.
+ */
+bucket_t routing_table_find_bucket(routing_table_t table, unsigned int id)
+{
+ unsigned int xor_number = table->id ^ id;
+ unsigned int prefix = get_node_prefix(xor_number, identifier_size);
+ xbt_assert(prefix <= identifier_size, "Tried to return a bucket that doesn't exist.");
+ bucket_t bucket = &table->buckets[prefix];
+ return bucket;
+}
