1 files changed, 109 insertions, 0 deletions
diff --git a/src/include/gnunet_nse_service.h b/src/include/gnunet_nse_service.h
new file mode 100644
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+++ b/src/include/gnunet_nse_service.h
@@ -0,0 +1,109 @@
+/*
+      This file is part of GNUnet
+      (C) 2011 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.
+ */
+
+#ifndef GNUNET_NSE_SERVICE_H_
+#define GNUNET_NSE_SERVICE_H_
+
+/**
+ * @file include/gnunet_nse_service.h
+ * @brief API to retrieve the current network size estimate,
+ *        also to register for notifications whenever a new
+ *        network size estimate is calculated.
+ *
+ * @author Nathan Evans
+ */
+
+#ifdef __cplusplus
+extern "C"
+{
+#if 0                           /* keep Emacsens' auto-indent happy */
+}
+#endif
+#endif
+
+#include "gnunet_common.h"
+#include "gnunet_configuration_lib.h"
+#include "gnunet_scheduler_lib.h"
+
+/**
+ * Version of the network size estimation API.
+ */
+#define GNUNET_NSE_VERSION 0x00000000
+
+/**
+ * Handle for the network size estimation service.
+ */
+struct GNUNET_NSE_Handle;
+
+/**
+ * Callback to call when network size estimate is updated.
+ *
+ * @param cls closure
+ * @param timestamp time when the estimate was received from the server (or created by the server)
+ * @param logestimate the log(Base 2) value of the current network size estimate
+ * @param std_dev standard deviation for the estimate
+ *
+ */
+typedef void (*GNUNET_NSE_Callback) (void *cls,
+                                     struct GNUNET_TIME_Absolute timestamp,
+                                     double logestimate, double std_dev);
+
+
+/**
+ * Convert the logarithmic estimated returned to the 'GNUNET_NSE_Callback'
+ * into an absolute estimate in terms of the number of peers in the network.
+ *
+ * @param loge logarithmic estimate
+ * @return absolute number of peers in the network (estimated)
+ */
+#define GNUNET_NSE_log_estimate_to_n(loge) pow(2.0, (loge))
+
+/**
+ * Connect to the network size estimation service.
+ *
+ * @param cfg the configuration to use
+ * @param func funtion to call with network size estimate
+ * @param func_cls closure to pass for network size estimate callback
+ *
+ * @return handle to use
+ */
+struct GNUNET_NSE_Handle *
+GNUNET_NSE_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
+                    GNUNET_NSE_Callback func, void *func_cls);
+
+
+/**
+ * Disconnect from network size estimation service
+ *
+ * @param h handle to destroy
+ *
+ */
+void
+GNUNET_NSE_disconnect (struct GNUNET_NSE_Handle *h);
+
+
+#if 0                           /* keep Emacsens' auto-indent happy */
+{
+#endif
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* GNUNET_NSE_SERVICE_H_ */