common.c

GNUnet是一个安全的点对点网络框架

/*
     This file is part of GNUnet
     (C) 2003, 2004, 2005, 2006, 2007, 2008 Christian Grothoff (and other contributing authors)

     GNUnet is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published
     by the Free Software Foundation; either version 2, 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
     General Public License for more details.

     You should have received a copy of the GNU General Public License
     along with GNUnet; see the file COPYING.  If not, write to the
     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
     Boston, MA 02111-1307, USA.
*/

/**
 * @file applications/fs/namespace/common.c
 * @brief helper functions
 * @author Christian Grothoff
 */

#include "platform.h"
#include "gnunet_util.h"
#include "gnunet_directories.h"
#include "common.h"

/**
 * Get the filename (or directory name) for the given
 * namespace and content identifier and directory
 * prefix.
 *
 * @param prefix NS_DIR, NS_UPDATE_DIR or NS_ROOTS
 * @param nsid maybe NULL
 * @param lastId maybe NULL
 */
char *
GNUNET_NS_internal_get_data_filename_ (struct GNUNET_GE_Context *ectx,
                                       struct GNUNET_GC_Configuration *cfg,
                                       const char *prefix,
                                       const GNUNET_HashCode * nsid,
                                       const GNUNET_HashCode * lastId)
{
  char *tmp;
  char *ret;
  GNUNET_EncName enc;
  GNUNET_EncName idenc;

  GNUNET_GC_get_configuration_value_filename (cfg,
                                              "GNUNET",
                                              "GNUNET_HOME",
                                              GNUNET_DEFAULT_HOME_DIRECTORY,
                                              &tmp);
  ret =
    GNUNET_malloc (strlen (tmp) + strlen (prefix) +
                   sizeof (GNUNET_EncName) * 2 + 20);
  strcpy (ret, tmp);
  GNUNET_free (tmp);
  if (ret[strlen (ret) - 1] != DIR_SEPARATOR)
    strcat (ret, DIR_SEPARATOR_STR);
  strcat (ret, prefix);
  GNUNET_disk_directory_create (ectx, ret);
  if (nsid != NULL)
    {
      GNUNET_hash_to_enc (nsid, &enc);
      strcat (ret, (const char *) &enc);
    }
  if (lastId != NULL)
    {
      strcat (ret, DIR_SEPARATOR_STR);
      GNUNET_disk_directory_create (ectx, ret);
      GNUNET_hash_to_enc (lastId, &idenc);
      strcat (ret, (const char *) &idenc);
    }
  return ret;
}

/* end of common.c */