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diff --git a/src/messenger/gnunet-service-messenger_message_state.h b/src/messenger/gnunet-service-messenger_message_state.h
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+/*
+ 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.h
+ * @brief GNUnet MESSENGER service
+ */
+
+#ifndef GNUNET_SERVICE_MESSENGER_MESSAGE_STATE_H
+#define GNUNET_SERVICE_MESSENGER_MESSAGE_STATE_H
+
+#include "platform.h"
+#include "gnunet_crypto_lib.h"
+
+#include "messenger_api_message.h"
+#include "gnunet-service-messenger_list_messages.h"
+
+struct GNUNET_MESSENGER_MessageState
+{
+ struct GNUNET_MESSENGER_ListMessages last_messages;
+};
+
+void
+init_message_state (struct GNUNET_MESSENGER_MessageState *state);
+
+void
+clear_message_state (struct GNUNET_MESSENGER_MessageState *state);
+
+void
+get_message_state_chain_hash (const struct GNUNET_MESSENGER_MessageState *state,
+ struct GNUNET_HashCode *hash);
+
+const struct GNUNET_HashCode*
+get_message_state_merge_hash (const struct GNUNET_MESSENGER_MessageState *state);
+
+void
+update_message_state (struct GNUNET_MESSENGER_MessageState *state, int requested,
+ const struct GNUNET_MESSENGER_Message *message, const struct GNUNET_HashCode *hash);
+
+void
+load_message_state (struct GNUNET_MESSENGER_MessageState *state, const char *path);
+
+void
+save_message_state (const struct GNUNET_MESSENGER_MessageState *state, const char *path);
+
+#endif //GNUNET_SERVICE_MESSENGER_MESSAGE_STATE_H