X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=src%2Futil%2Ftime.c;h=ee90eb8ae552ff9dd677e5100cf4ec776a5466ec;hb=6ede545d597509fefcc3d4fd2ef865bc5f57603f;hp=3631c0a7868cc6110a796193e55b36b391ca3874;hpb=07ba70f731218eb74993553ff4923fd2ece3635b;p=oweals%2Fgnunet.git

diff --git a/src/util/time.c b/src/util/time.c
index 3631c0a78..ee90eb8ae 100644
--- a/src/util/time.c
+++ b/src/util/time.c
@@ -1,21 +1,19 @@
 /*
      This file is part of GNUnet.
-     (C) 2001, 2002, 2006, 2009 Christian Grothoff (and other contributing authors)
+     Copyright (C) 2001-2013 GNUnet e.V.
 
-     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 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
-     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.
+     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/>.
 */
 
 /**
@@ -24,8 +22,14 @@
  * @brief functions for handling time and time arithmetic
  */
 #include "platform.h"
+#include "gnunet_crypto_lib.h"
 #include "gnunet_time_lib.h"
 
+#define LOG(kind,...) GNUNET_log_from (kind, "util-time", __VA_ARGS__)
+
+/**
+ * Variable used to simulate clock skew.  Used for testing, never in production.
+ */
 static long long timestamp_offset;
 
 /**
@@ -34,11 +38,64 @@ static long long timestamp_offset;
  * @param offset the offset to skew the locale time by
  */
 void
-GNUNET_TIME_set_offset(long long offset)
+GNUNET_TIME_set_offset (long long offset)
 {
   timestamp_offset = offset;
 }
 
+
+/**
+ * Get the timestamp offset for this instance.
+ *
+ * @return the offset we currently skew the locale time by
+ */
+long long
+GNUNET_TIME_get_offset ()
+{
+  return timestamp_offset;
+}
+
+
+/**
+ * Round a time value so that it is suitable for transmission
+ * via JSON encodings.
+ *
+ * @param at time to round
+ * @return #GNUNET_OK if time was already rounded, #GNUNET_NO if
+ *         it was just now rounded
+ */
+int
+GNUNET_TIME_round_abs (struct GNUNET_TIME_Absolute *at)
+{
+  if (at->abs_value_us == GNUNET_TIME_UNIT_FOREVER_ABS.abs_value_us)
+    return GNUNET_OK;
+  if (0 == at->abs_value_us % 1000000)
+    return GNUNET_OK;
+  at->abs_value_us -= at->abs_value_us % 1000000;
+  return GNUNET_NO;
+}
+
+
+/**
+ * Round a time value so that it is suitable for transmission
+ * via JSON encodings.
+ *
+ * @param rt time to round
+ * @return #GNUNET_OK if time was already rounded, #GNUNET_NO if
+ *         it was just now rounded
+ */
+int
+GNUNET_TIME_round_rel (struct GNUNET_TIME_Relative *rt)
+{
+  if (rt->rel_value_us == GNUNET_TIME_UNIT_FOREVER_REL.rel_value_us)
+    return GNUNET_OK;
+  if (0 == rt->rel_value_us % 1000000)
+    return GNUNET_OK;
+  rt->rel_value_us -= rt->rel_value_us % 1000000;
+  return GNUNET_NO;
+}
+
+
 /**
  * Get the current time (works just as "time", just that we use the
  * unit of time that the cron-jobs use (and is 64 bit)).
@@ -52,9 +109,9 @@ GNUNET_TIME_absolute_get ()
   struct timeval tv;
 
   GETTIMEOFDAY (&tv, NULL);
-  ret.abs_value =
-    (uint64_t) (((uint64_t) tv.tv_sec * 1000LL) +
-                ((uint64_t) tv.tv_usec / 1000LL)) + timestamp_offset;
+  ret.abs_value_us =
+      (uint64_t) (((uint64_t) tv.tv_sec * 1000LL * 1000LL) +
+                  ((uint64_t) tv.tv_usec)) + timestamp_offset;
   return ret;
 }
 
@@ -63,9 +120,10 @@ GNUNET_TIME_absolute_get ()
  * Return relative time of 0ms.
  */
 struct GNUNET_TIME_Relative
-GNUNET_TIME_relative_get_zero ()
+GNUNET_TIME_relative_get_zero_ ()
 {
   static struct GNUNET_TIME_Relative zero;
+
   return zero;
 }
 
@@ -74,42 +132,97 @@ GNUNET_TIME_relative_get_zero ()
  * Return absolute time of 0ms.
  */
 struct GNUNET_TIME_Absolute
-GNUNET_TIME_absolute_get_zero ()
+GNUNET_TIME_absolute_get_zero_ ()
 {
   static struct GNUNET_TIME_Absolute zero;
+
   return zero;
 }
 
+
 /**
- * Return relative time of 1ms.
+ * Return relative time of 1us.
  */
 struct GNUNET_TIME_Relative
-GNUNET_TIME_relative_get_unit ()
+GNUNET_TIME_relative_get_unit_ ()
 {
   static struct GNUNET_TIME_Relative one = { 1 };
+
   return one;
 }
 
+
+/**
+ * Return relative time of 1ms.
+ */
+struct GNUNET_TIME_Relative
+GNUNET_TIME_relative_get_millisecond_ ()
+{
+  static struct GNUNET_TIME_Relative one = { 1000 };
+
+  return one;
+}
+
+
+/**
+ * Return relative time of 1s.
+ */
+struct GNUNET_TIME_Relative
+GNUNET_TIME_relative_get_second_ ()
+{
+  static struct GNUNET_TIME_Relative one = { 1000 * 1000LL };
+
+  return one;
+}
+
+
+/**
+ * Return relative time of 1 minute.
+ */
+struct GNUNET_TIME_Relative
+GNUNET_TIME_relative_get_minute_ ()
+{
+  static struct GNUNET_TIME_Relative one = { 60 * 1000 * 1000LL };
+
+  return one;
+}
+
+
+/**
+ * Return relative time of 1 hour.
+ */
+struct GNUNET_TIME_Relative
+GNUNET_TIME_relative_get_hour_ ()
+{
+  static struct GNUNET_TIME_Relative one = { 60 * 60 * 1000 * 1000LL };
+
+  return one;
+}
+
+
 /**
  * Return "forever".
  */
 struct GNUNET_TIME_Relative
-GNUNET_TIME_relative_get_forever ()
+GNUNET_TIME_relative_get_forever_ ()
 {
   static struct GNUNET_TIME_Relative forever = { UINT64_MAX };
+
   return forever;
 }
 
+
 /**
  * Return "forever".
  */
 struct GNUNET_TIME_Absolute
-GNUNET_TIME_absolute_get_forever ()
+GNUNET_TIME_absolute_get_forever_ ()
 {
   static struct GNUNET_TIME_Absolute forever = { UINT64_MAX };
   return forever;
 }
 
+
 /**
  * Convert relative time to an absolute time in the
  * future.
@@ -120,15 +233,17 @@ struct GNUNET_TIME_Absolute
 GNUNET_TIME_relative_to_absolute (struct GNUNET_TIME_Relative rel)
 {
   struct GNUNET_TIME_Absolute ret;
-  if (rel.rel_value == UINT64_MAX)
-    return GNUNET_TIME_absolute_get_forever ();
+
+  if (rel.rel_value_us == UINT64_MAX)
+    return GNUNET_TIME_UNIT_FOREVER_ABS;
   struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();
-  if (rel.rel_value + now.abs_value < rel.rel_value)
-    {
-      GNUNET_break (0);         /* overflow... */
-      return GNUNET_TIME_absolute_get_forever ();
-    }
-  ret.abs_value = rel.rel_value + now.abs_value;
+
+  if (rel.rel_value_us + now.abs_value_us < rel.rel_value_us)
+  {
+    GNUNET_break (0);           /* overflow... */
+    return GNUNET_TIME_UNIT_FOREVER_ABS;
+  }
+  ret.abs_value_us = rel.rel_value_us + now.abs_value_us;
   return ret;
 }
 
@@ -141,11 +256,10 @@ GNUNET_TIME_relative_to_absolute (struct GNUNET_TIME_Relative rel)
  * @return timestamp that is smaller
  */
 struct GNUNET_TIME_Relative
-GNUNET_TIME_relative_min (struct
-                          GNUNET_TIME_Relative
-                          t1, struct GNUNET_TIME_Relative t2)
+GNUNET_TIME_relative_min (struct GNUNET_TIME_Relative t1,
+                          struct GNUNET_TIME_Relative t2)
 {
-  return (t1.rel_value < t2.rel_value) ? t1 : t2;
+  return (t1.rel_value_us < t2.rel_value_us) ? t1 : t2;
 }
 
 
@@ -157,11 +271,10 @@ GNUNET_TIME_relative_min (struct
  * @return timestamp that is larger
  */
 struct GNUNET_TIME_Relative
-GNUNET_TIME_relative_max (struct
-                          GNUNET_TIME_Relative
-                          t1, struct GNUNET_TIME_Relative t2)
+GNUNET_TIME_relative_max (struct GNUNET_TIME_Relative t1,
+                          struct GNUNET_TIME_Relative t2)
 {
-  return (t1.rel_value > t2.rel_value) ? t1 : t2;
+  return (t1.rel_value_us > t2.rel_value_us) ? t1 : t2;
 }
 
 
@@ -174,11 +287,10 @@ GNUNET_TIME_relative_max (struct
  * @return timestamp that is smaller
  */
 struct GNUNET_TIME_Absolute
-GNUNET_TIME_absolute_min (struct
-                          GNUNET_TIME_Absolute
-                          t1, struct GNUNET_TIME_Absolute t2)
+GNUNET_TIME_absolute_min (struct GNUNET_TIME_Absolute t1,
+                          struct GNUNET_TIME_Absolute t2)
 {
-  return (t1.abs_value < t2.abs_value) ? t1 : t2;
+  return (t1.abs_value_us < t2.abs_value_us) ? t1 : t2;
 }
 
 
@@ -187,14 +299,13 @@ GNUNET_TIME_absolute_min (struct
  *
  * @param t1 first timestamp
  * @param t2 other timestamp
- * @return timestamp that is smaller
+ * @return timestamp that is bigger
  */
 struct GNUNET_TIME_Absolute
-GNUNET_TIME_absolute_max (struct
-                          GNUNET_TIME_Absolute
-                          t1, struct GNUNET_TIME_Absolute t2)
+GNUNET_TIME_absolute_max (struct GNUNET_TIME_Absolute t1,
+                          struct GNUNET_TIME_Absolute t2)
 {
-  return (t1.abs_value > t2.abs_value) ? t1 : t2;
+  return (t1.abs_value_us > t2.abs_value_us) ? t1 : t2;
 }
 
 
@@ -208,12 +319,14 @@ struct GNUNET_TIME_Relative
 GNUNET_TIME_absolute_get_remaining (struct GNUNET_TIME_Absolute future)
 {
   struct GNUNET_TIME_Relative ret;
-  if (future.abs_value == UINT64_MAX)
-    return GNUNET_TIME_relative_get_forever ();
+
+  if (future.abs_value_us == UINT64_MAX)
+    return GNUNET_TIME_UNIT_FOREVER_REL;
   struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();
-  if (now.abs_value > future.abs_value)
-    return GNUNET_TIME_relative_get_zero ();
-  ret.rel_value = future.abs_value - now.abs_value;
+
+  if (now.abs_value_us > future.abs_value_us)
+    return GNUNET_TIME_UNIT_ZERO;
+  ret.rel_value_us = future.abs_value_us - now.abs_value_us;
   return ret;
 }
 
@@ -229,11 +342,12 @@ GNUNET_TIME_absolute_get_difference (struct GNUNET_TIME_Absolute start,
                                      struct GNUNET_TIME_Absolute end)
 {
   struct GNUNET_TIME_Relative ret;
-  if (end.abs_value == UINT64_MAX)
-    return GNUNET_TIME_relative_get_forever ();
-  if (end.abs_value < start.abs_value)
-    return GNUNET_TIME_relative_get_zero ();
-  ret.rel_value = end.abs_value - start.abs_value;
+
+  if (end.abs_value_us == UINT64_MAX)
+    return GNUNET_TIME_UNIT_FOREVER_REL;
+  if (end.abs_value_us < start.abs_value_us)
+    return GNUNET_TIME_UNIT_ZERO;
+  ret.rel_value_us = end.abs_value_us - start.abs_value_us;
   return ret;
 }
 
@@ -241,7 +355,7 @@ GNUNET_TIME_absolute_get_difference (struct GNUNET_TIME_Absolute start,
  * Get the duration of an operation as the
  * difference of the current time and the given start time "whence".
  *
- * @return aborts if whence==FOREVER, 0 if whence > now, otherwise now-whence.
+ * @return 0 if whence > now, otherwise now-whence.
  */
 struct GNUNET_TIME_Relative
 GNUNET_TIME_absolute_get_duration (struct GNUNET_TIME_Absolute whence)
@@ -250,10 +364,9 @@ GNUNET_TIME_absolute_get_duration (struct GNUNET_TIME_Absolute whence)
   struct GNUNET_TIME_Relative ret;
 
   now = GNUNET_TIME_absolute_get ();
-  GNUNET_assert (whence.abs_value != UINT64_MAX);
-  if (whence.abs_value > now.abs_value)
-    return GNUNET_TIME_relative_get_zero ();
-  ret.rel_value = now.abs_value - whence.abs_value;
+  if (whence.abs_value_us > now.abs_value_us)
+    return GNUNET_TIME_UNIT_ZERO;
+  ret.rel_value_us = now.abs_value_us - whence.abs_value_us;
   return ret;
 }
 
@@ -270,15 +383,14 @@ GNUNET_TIME_absolute_add (struct GNUNET_TIME_Absolute start,
 {
   struct GNUNET_TIME_Absolute ret;
 
-  if ((start.abs_value == UINT64_MAX) ||
-      (duration.rel_value == UINT64_MAX))
-    return GNUNET_TIME_absolute_get_forever ();
-  if (start.abs_value + duration.rel_value < start.abs_value)
-    {
-      GNUNET_break (0);
-      return GNUNET_TIME_absolute_get_forever ();
-    }
-  ret.abs_value = start.abs_value + duration.rel_value;
+  if ((start.abs_value_us == UINT64_MAX) || (duration.rel_value_us == UINT64_MAX))
+    return GNUNET_TIME_UNIT_FOREVER_ABS;
+  if (start.abs_value_us + duration.rel_value_us < start.abs_value_us)
+  {
+    GNUNET_break (0);
+    return GNUNET_TIME_UNIT_FOREVER_ABS;
+  }
+  ret.abs_value_us = start.abs_value_us + duration.rel_value_us;
   return ret;
 }
 
@@ -291,20 +403,17 @@ GNUNET_TIME_absolute_add (struct GNUNET_TIME_Absolute start,
  * @param duration some relative time to subtract
  * @return ZERO if start <= duration, or FOREVER if start time is FOREVER; start-duration otherwise
  */
-struct GNUNET_TIME_Absolute 
-GNUNET_TIME_absolute_subtract (struct
-			       GNUNET_TIME_Absolute
-			       start,
-			       struct
-			       GNUNET_TIME_Relative
-			       duration)
+struct GNUNET_TIME_Absolute
+GNUNET_TIME_absolute_subtract (struct GNUNET_TIME_Absolute start,
+                               struct GNUNET_TIME_Relative duration)
 {
   struct GNUNET_TIME_Absolute ret;
-  if (start.abs_value <= duration.rel_value)
+
+  if (start.abs_value_us <= duration.rel_value_us)
     return GNUNET_TIME_UNIT_ZERO_ABS;
-  if (start.abs_value == GNUNET_TIME_UNIT_FOREVER_ABS.abs_value)
+  if (start.abs_value_us == GNUNET_TIME_UNIT_FOREVER_ABS.abs_value_us)
     return GNUNET_TIME_UNIT_FOREVER_ABS;
-  ret.abs_value = start.abs_value - duration.rel_value;
+  ret.abs_value_us = start.abs_value_us - duration.rel_value_us;
   return ret;
 }
 
@@ -316,17 +425,46 @@ GNUNET_TIME_absolute_subtract (struct
  */
 struct GNUNET_TIME_Relative
 GNUNET_TIME_relative_multiply (struct GNUNET_TIME_Relative rel,
-                               unsigned int factor)
+                               unsigned long long factor)
 {
   struct GNUNET_TIME_Relative ret;
-  if (factor == 0)
-    return GNUNET_TIME_relative_get_zero ();
-  ret.rel_value = rel.rel_value * (unsigned long long) factor;
-  if (ret.rel_value / factor != rel.rel_value)
-    {
-      GNUNET_break (0);
-      return GNUNET_TIME_relative_get_forever ();
-    }
+
+  if (0 == factor)
+    return GNUNET_TIME_UNIT_ZERO;
+  if (rel.rel_value_us == GNUNET_TIME_UNIT_FOREVER_REL.rel_value_us)
+    return GNUNET_TIME_UNIT_FOREVER_REL;
+  ret.rel_value_us = rel.rel_value_us * factor;
+  if (ret.rel_value_us / factor != rel.rel_value_us)
+  {
+    GNUNET_break (0);
+    return GNUNET_TIME_UNIT_FOREVER_REL;
+  }
+  return ret;
+}
+
+
+/**
+ * Saturating multiply relative time by a given factor.
+ *
+ * @param rel some duration
+ * @param factor integer to multiply with
+ * @return FOREVER if rel=FOREVER or on overflow; otherwise rel*factor
+ */
+struct GNUNET_TIME_Relative
+GNUNET_TIME_relative_saturating_multiply (struct GNUNET_TIME_Relative rel,
+                                          unsigned long long factor)
+{
+  struct GNUNET_TIME_Relative ret;
+
+  if (0 == factor)
+    return GNUNET_TIME_UNIT_ZERO;
+  if (rel.rel_value_us == GNUNET_TIME_UNIT_FOREVER_REL.rel_value_us)
+    return GNUNET_TIME_UNIT_FOREVER_REL;
+  ret.rel_value_us = rel.rel_value_us * factor;
+  if (ret.rel_value_us / factor != rel.rel_value_us)
+  {
+    return GNUNET_TIME_UNIT_FOREVER_REL;
+  }
   return ret;
 }
 
@@ -340,19 +478,20 @@ GNUNET_TIME_relative_multiply (struct GNUNET_TIME_Relative rel,
  */
 struct GNUNET_TIME_Relative
 GNUNET_TIME_relative_divide (struct GNUNET_TIME_Relative rel,
-			     unsigned int factor)
+                             unsigned long long factor)
 {
   struct GNUNET_TIME_Relative ret;
-  if ( (factor == 0) ||
-       (rel.rel_value == GNUNET_TIME_UNIT_FOREVER_REL.rel_value) )
+
+  if ((0 == factor) ||
+      (rel.rel_value_us == GNUNET_TIME_UNIT_FOREVER_REL.rel_value_us))
     return GNUNET_TIME_UNIT_FOREVER_REL;
-  ret.rel_value = rel.rel_value / (unsigned long long) factor;
+  ret.rel_value_us = rel.rel_value_us / factor;
   return ret;
 }
 
 
 /**
- * Calculate the estimate time of arrival/completion 
+ * Calculate the estimate time of arrival/completion
  * for an operation.
  *
  * @param start when did the operation start?
@@ -362,8 +501,8 @@ GNUNET_TIME_relative_divide (struct GNUNET_TIME_Relative rel,
  *        assuming it continues at the same speed
  */
 struct GNUNET_TIME_Relative
-GNUNET_TIME_calculate_eta (struct GNUNET_TIME_Absolute start,
-                           uint64_t finished, uint64_t total)
+GNUNET_TIME_calculate_eta (struct GNUNET_TIME_Absolute start, uint64_t finished,
+                           uint64_t total)
 {
   struct GNUNET_TIME_Relative dur;
   double exp;
@@ -372,11 +511,11 @@ GNUNET_TIME_calculate_eta (struct GNUNET_TIME_Absolute start,
   GNUNET_break (finished <= total);
   if (finished >= total)
     return GNUNET_TIME_UNIT_ZERO;
-  if (finished == 0)
+  if (0 == finished)
     return GNUNET_TIME_UNIT_FOREVER_REL;
   dur = GNUNET_TIME_absolute_get_duration (start);
-  exp = ((double) dur.rel_value) * ((double) total) / ((double) finished);
-  ret.rel_value = ((uint64_t) exp) - dur.rel_value;
+  exp = ((double) dur.rel_value_us) * ((double) total) / ((double) finished);
+  ret.rel_value_us = ((uint64_t) exp) - dur.rel_value_us;
   return ret;
 }
 
@@ -394,14 +533,14 @@ GNUNET_TIME_relative_add (struct GNUNET_TIME_Relative a1,
 {
   struct GNUNET_TIME_Relative ret;
 
-  if ((a1.rel_value == UINT64_MAX) || (a2.rel_value == UINT64_MAX))
-    return GNUNET_TIME_relative_get_forever ();
-  if (a1.rel_value + a2.rel_value < a1.rel_value)
-    {
-      GNUNET_break (0);
-      return GNUNET_TIME_relative_get_forever ();
-    }
-  ret.rel_value = a1.rel_value + a2.rel_value;
+  if ((a1.rel_value_us == UINT64_MAX) || (a2.rel_value_us == UINT64_MAX))
+    return GNUNET_TIME_UNIT_FOREVER_REL;
+  if (a1.rel_value_us + a2.rel_value_us < a1.rel_value_us)
+  {
+    GNUNET_break (0);
+    return GNUNET_TIME_UNIT_FOREVER_REL;
+  }
+  ret.rel_value_us = a1.rel_value_us + a2.rel_value_us;
   return ret;
 }
 
@@ -415,15 +554,15 @@ GNUNET_TIME_relative_add (struct GNUNET_TIME_Relative a1,
  */
 struct GNUNET_TIME_Relative
 GNUNET_TIME_relative_subtract (struct GNUNET_TIME_Relative a1,
-			       struct GNUNET_TIME_Relative a2)
+                               struct GNUNET_TIME_Relative a2)
 {
   struct GNUNET_TIME_Relative ret;
 
-  if (a2.rel_value >= a1.rel_value)
-    return GNUNET_TIME_relative_get_zero ();
-  if (a1.rel_value == UINT64_MAX) 
-    return GNUNET_TIME_relative_get_forever ();
-  ret.rel_value = a1.rel_value - a2.rel_value;
+  if (a2.rel_value_us >= a1.rel_value_us)
+    return GNUNET_TIME_UNIT_ZERO;
+  if (a1.rel_value_us == UINT64_MAX)
+    return GNUNET_TIME_UNIT_FOREVER_REL;
+  ret.rel_value_us = a1.rel_value_us - a2.rel_value_us;
   return ret;
 }
 
@@ -438,10 +577,12 @@ struct GNUNET_TIME_RelativeNBO
 GNUNET_TIME_relative_hton (struct GNUNET_TIME_Relative a)
 {
   struct GNUNET_TIME_RelativeNBO ret;
-  ret.rel_value__ = GNUNET_htonll (a.rel_value);
+
+  ret.rel_value_us__ = GNUNET_htonll (a.rel_value_us);
   return ret;
 }
 
+
 /**
  * Convert relative time from network byte order.
  *
@@ -452,11 +593,12 @@ struct GNUNET_TIME_Relative
 GNUNET_TIME_relative_ntoh (struct GNUNET_TIME_RelativeNBO a)
 {
   struct GNUNET_TIME_Relative ret;
-  ret.rel_value = GNUNET_ntohll (a.rel_value__);
-  return ret;
 
+  ret.rel_value_us = GNUNET_ntohll (a.rel_value_us__);
+  return ret;
 }
 
+
 /**
  * Convert absolute time to network byte order.
  *
@@ -467,10 +609,12 @@ struct GNUNET_TIME_AbsoluteNBO
 GNUNET_TIME_absolute_hton (struct GNUNET_TIME_Absolute a)
 {
   struct GNUNET_TIME_AbsoluteNBO ret;
-  ret.abs_value__ = GNUNET_htonll (a.abs_value);
+
+  ret.abs_value_us__ = GNUNET_htonll (a.abs_value_us);
   return ret;
 }
 
+
 /**
  * Convert absolute time from network byte order.
  *
@@ -481,28 +625,79 @@ struct GNUNET_TIME_Absolute
 GNUNET_TIME_absolute_ntoh (struct GNUNET_TIME_AbsoluteNBO a)
 {
   struct GNUNET_TIME_Absolute ret;
-  ret.abs_value = GNUNET_ntohll (a.abs_value__);
+
+  ret.abs_value_us = GNUNET_ntohll (a.abs_value_us__);
   return ret;
 
 }
 
+
 /**
- * Convert a relative time to a string.
- * This is one of the very few calls in the entire API that is
- * NOT reentrant!
- *
- * @param time the time to print
+ * Return the current year (i.e. '2011').
+ */
+unsigned int
+GNUNET_TIME_get_current_year ()
+{
+  time_t tp;
+  struct tm *t;
+
+  tp = time (NULL);
+  t = gmtime (&tp);
+  if (t == NULL)
+    return 0;
+  return t->tm_year + 1900;
+}
+
+
+/**
+ * Convert an expiration time to the respective year (rounds)
  *
- * @return string form of the time (as milliseconds)
+ * @param at absolute time
+ * @return year a year (after 1970), 0 on error
  */
-const char *
-GNUNET_TIME_relative_to_string (struct GNUNET_TIME_Relative time)
+unsigned int
+GNUNET_TIME_time_to_year (struct GNUNET_TIME_Absolute at)
 {
-  static char time_string[21];
-  memset(time_string, 0, sizeof(time_string));
+  struct tm *t;
+  time_t tp;
+
+  tp = at.abs_value_us / 1000LL / 1000LL;    /* microseconds to seconds */
+  t = gmtime (&tp);
+  if (t == NULL)
+    return 0;
+  return t->tm_year + 1900;
+
+}
 
-  sprintf(time_string, "%lu", time.rel_value);
-  return (const char *) time_string;
+
+/**
+ * Convert a year to an expiration time of January 1st of that year.
+ *
+ * @param year a year (after 1970, please ;-)).
+ * @return absolute time for January 1st of that year.
+ */
+struct GNUNET_TIME_Absolute
+GNUNET_TIME_year_to_time (unsigned int year)
+{
+  struct GNUNET_TIME_Absolute ret;
+  time_t tp;
+  struct tm t;
+
+  memset (&t, 0, sizeof (t));
+  if (year < 1900)
+  {
+    GNUNET_break (0);
+    return GNUNET_TIME_absolute_get (); /* now */
+  }
+  t.tm_year = year - 1900;
+  t.tm_mday = 1;
+  t.tm_mon = 0;
+  t.tm_wday = 1;
+  t.tm_yday = 1;
+  tp = mktime (&t);
+  GNUNET_break (tp != (time_t) - 1);
+  ret.abs_value_us = tp * 1000LL * 1000LL;  /* seconds to microseconds */
+  return ret;
 }