1 files changed, 165 insertions, 0 deletions

diff --git a/src/service/messenger/gnunet-service-messenger_list_messages.c b/src/service/messenger/gnunet-service-messenger_list_messages.c
new file mode 100644
index 000000000..063e1ebfc
--- /dev/null
+++ b/src/service/messenger/gnunet-service-messenger_list_messages.c
@@ -0,0 +1,165 @@
+/*
+   This file is part of GNUnet.
+   Copyright (C) 2020--2023 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_list_messages.c
+ * @brief GNUnet MESSENGER service
+ */
+
+#include "platform.h"
+#include "gnunet-service-messenger_list_messages.h"
+
+void
+init_list_messages (struct GNUNET_MESSENGER_ListMessages *messages)
+{
+  GNUNET_assert (messages);
+
+  messages->head = NULL;
+  messages->tail = NULL;
+}
+
+
+void
+clear_list_messages (struct GNUNET_MESSENGER_ListMessages *messages)
+{
+  GNUNET_assert (messages);
+
+  while (messages->head)
+  {
+    struct GNUNET_MESSENGER_ListMessage *element = messages->head;
+
+    GNUNET_CONTAINER_DLL_remove (messages->head, messages->tail, element);
+    GNUNET_free (element);
+  }
+
+  messages->head = NULL;
+  messages->tail = NULL;
+}
+
+
+void
+add_to_list_messages (struct GNUNET_MESSENGER_ListMessages *messages,
+                      const struct GNUNET_HashCode *hash)
+{
+  GNUNET_assert ((messages) && (hash));
+
+  struct GNUNET_MESSENGER_ListMessage *element = GNUNET_new (struct
+                                                             GNUNET_MESSENGER_ListMessage);
+
+  GNUNET_memcpy (&(element->hash), hash, sizeof(struct GNUNET_HashCode));
+
+  GNUNET_CONTAINER_DLL_insert_tail (messages->head, messages->tail, element);
+}
+
+
+void
+copy_list_messages (struct GNUNET_MESSENGER_ListMessages *messages,
+                    const struct GNUNET_MESSENGER_ListMessages *origin)
+{
+  GNUNET_assert ((messages) && (origin));
+
+  struct GNUNET_MESSENGER_ListMessage *element;
+
+  for (element = origin->head; element; element = element->next)
+    add_to_list_messages (messages, &(element->hash));
+}
+
+
+void
+remove_from_list_messages (struct GNUNET_MESSENGER_ListMessages *messages,
+                           const struct GNUNET_HashCode *hash)
+{
+  GNUNET_assert ((messages) && (hash));
+
+  struct GNUNET_MESSENGER_ListMessage *element;
+
+  for (element = messages->head; element; element = element->next)
+    if (0 == GNUNET_CRYPTO_hash_cmp (&(element->hash), hash))
+    {
+      GNUNET_CONTAINER_DLL_remove (messages->head, messages->tail, element);
+      GNUNET_free (element);
+      break;
+    }
+}
+
+
+void
+load_list_messages (struct GNUNET_MESSENGER_ListMessages *messages,
+                    const char *path)
+{
+  GNUNET_assert ((messages) && (path));
+
+  if (GNUNET_YES != GNUNET_DISK_file_test (path))
+    return;
+
+  enum GNUNET_DISK_AccessPermissions permission = (GNUNET_DISK_PERM_USER_READ
+                                                   | GNUNET_DISK_PERM_USER_WRITE);
+
+  struct GNUNET_DISK_FileHandle *handle = GNUNET_DISK_file_open (
+    path, GNUNET_DISK_OPEN_READ, permission
+    );
+
+  if (! handle)
+    return;
+
+  GNUNET_DISK_file_seek (handle, 0, GNUNET_DISK_SEEK_SET);
+
+  struct GNUNET_HashCode hash;
+  ssize_t len;
+
+  do {
+    len = GNUNET_DISK_file_read (handle, &hash, sizeof(hash));
+
+    if (len != sizeof(hash))
+      break;
+
+    add_to_list_messages (messages, &hash);
+  } while (len == sizeof(hash));
+
+  GNUNET_DISK_file_close (handle);
+}
+
+
+void
+save_list_messages (const struct GNUNET_MESSENGER_ListMessages *messages,
+                    const char *path)
+{
+  GNUNET_assert ((messages) && (path));
+
+  enum GNUNET_DISK_AccessPermissions permission = (GNUNET_DISK_PERM_USER_READ
+                                                   | GNUNET_DISK_PERM_USER_WRITE);
+
+  struct GNUNET_DISK_FileHandle *handle = GNUNET_DISK_file_open (
+    path, GNUNET_DISK_OPEN_CREATE | GNUNET_DISK_OPEN_WRITE, permission
+    );
+
+  if (! handle)
+    return;
+
+  GNUNET_DISK_file_seek (handle, 0, GNUNET_DISK_SEEK_SET);
+
+  struct GNUNET_MESSENGER_ListMessage *element;
+
+  for (element = messages->head; element; element = element->next)
+    GNUNET_DISK_file_write (handle, &(element->hash), sizeof(element->hash));
+
+  GNUNET_DISK_file_sync (handle);
+  GNUNET_DISK_file_close (handle);
+}