1 files changed, 109 insertions, 0 deletions

diff --git a/src/messenger/gnunet-service-messenger_message_state.c b/src/messenger/gnunet-service-messenger_message_state.c
new file mode 100644
index 000000000..cdd2d9712
--- /dev/null
+++ b/src/messenger/gnunet-service-messenger_message_state.c
@@ -0,0 +1,109 @@
+/*
+   This file is part of GNUnet.
+   Copyright (C) 2020--2021 GNUnet e.V.
+
+   GNUnet is free software: you can redistribute it and/or modify it
+   under the terms of the GNU Affero General Public License as published
+   by the Free Software Foundation, either version 3 of the License,
+   or (at your option) any later version.
+
+   GNUnet 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
+   Affero General Public License for more details.
+
+   You should have received a copy of the GNU Affero General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+   SPDX-License-Identifier: AGPL3.0-or-later
+ */
+/**
+ * @author Tobias Frisch
+ * @file src/messenger/gnunet-service-messenger_message_state.c
+ * @brief GNUnet MESSENGER service
+ */
+
+#include "gnunet-service-messenger_message_state.h"
+
+void
+init_message_state (struct GNUNET_MESSENGER_MessageState *state)
+{
+  GNUNET_assert(state);
+
+  init_list_messages (&(state->last_messages));
+}
+
+void
+clear_message_state (struct GNUNET_MESSENGER_MessageState *state)
+{
+  GNUNET_assert(state);
+
+  clear_list_messages (&(state->last_messages));
+}
+
+void
+get_message_state_chain_hash (const struct GNUNET_MESSENGER_MessageState *state,
+                              struct GNUNET_HashCode *hash)
+{
+  GNUNET_assert((state) && (hash));
+
+  if (state->last_messages.head)
+    GNUNET_memcpy(hash, &(state->last_messages.head->hash), sizeof(*hash));
+  else
+    memset (hash, 0, sizeof(*hash));
+}
+
+const struct GNUNET_HashCode*
+get_message_state_merge_hash (const struct GNUNET_MESSENGER_MessageState *state)
+{
+  GNUNET_assert(state);
+
+  if (state->last_messages.head == state->last_messages.tail)
+    return NULL;
+
+  return &(state->last_messages.tail->hash);
+}
+
+void
+update_message_state (struct GNUNET_MESSENGER_MessageState *state, int requested,
+                      const struct GNUNET_MESSENGER_Message *message, const struct GNUNET_HashCode *hash)
+{
+  GNUNET_assert((state) && (message) && (hash));
+
+  if ((GNUNET_YES == requested) ||
+      (GNUNET_MESSENGER_KIND_INFO == message->header.kind) ||
+      (GNUNET_MESSENGER_KIND_REQUEST == message->header.kind))
+    return;
+
+  if (GNUNET_MESSENGER_KIND_MERGE == message->header.kind)
+    remove_from_list_messages(&(state->last_messages), &(message->body.merge.previous));
+  remove_from_list_messages(&(state->last_messages), &(message->header.previous));
+
+  add_to_list_messages (&(state->last_messages), hash);
+}
+
+void
+load_message_state (struct GNUNET_MESSENGER_MessageState *state, const char *path)
+{
+  GNUNET_assert((state) && (path));
+
+  char *last_messages_file;
+  GNUNET_asprintf (&last_messages_file, "%s%s", path, "last_messages.list");
+
+  load_list_messages(&(state->last_messages), last_messages_file);
+  GNUNET_free(last_messages_file);
+}
+
+void
+save_message_state (const struct GNUNET_MESSENGER_MessageState *state, const char *path)
+{
+  GNUNET_assert((state) && (path));
+
+  char *last_messages_file;
+  GNUNET_asprintf (&last_messages_file, "%s%s", path, "last_messages.list");
+
+  save_list_messages(&(state->last_messages), last_messages_file);
+  GNUNET_free(last_messages_file);
+}
+
+