gnunet-service-messenger_list_messages.c

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/*
   This file is part of GNUnet.
   Copyright (C) 2020--2024 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
 */
#include "gnunet-service-messenger_list_messages.h"
 
#include "gnunet_util_lib.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)
{
  struct GNUNET_MESSENGER_ListMessage *element;
 
  GNUNET_assert ((messages) && (hash));
 
  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)
{
  struct GNUNET_MESSENGER_ListMessage *element;
 
  GNUNET_assert ((messages) && (origin));
 
  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)
{
  struct GNUNET_MESSENGER_ListMessage *element;
 
  GNUNET_assert ((messages) && (hash));
 
  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)
{
  struct GNUNET_DISK_FileHandle *handle;
  struct GNUNET_HashCode hash;
  ssize_t len;
 
  GNUNET_assert ((messages) && (path));
 
  if (GNUNET_YES != GNUNET_DISK_file_test (path))
    return;
 
  {
    enum GNUNET_DISK_AccessPermissions permission;
 
    permission = (GNUNET_DISK_PERM_USER_READ | GNUNET_DISK_PERM_USER_WRITE);
 
    handle = GNUNET_DISK_file_open (path, GNUNET_DISK_OPEN_READ, permission);
  }
 
  if (! handle)
    return;
 
  GNUNET_DISK_file_seek (handle, 0, GNUNET_DISK_SEEK_SET);
 
  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)
{
  struct GNUNET_DISK_FileHandle *handle;
 
  GNUNET_assert ((messages) && (path));
 
  {
    enum GNUNET_DISK_AccessPermissions permission;
 
    permission = (GNUNET_DISK_PERM_USER_READ | GNUNET_DISK_PERM_USER_WRITE);
    
    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);
}