1 files changed, 195 insertions, 0 deletions

diff --git a/src/fragmentation/fragmentation_new.c b/src/fragmentation/fragmentation_new.c
new file mode 100644
index 000000000..a95afc4a4
--- /dev/null
+++ b/src/fragmentation/fragmentation_new.c
@@ -0,0 +1,195 @@
+/*
+     This file is part of GNUnet
+     (C) 2009, 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 3, 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 src/fragmentation/fragmentation_new.c
+ * @brief library to help fragment messages
+ * @author Christian Grothoff
+ */
+
+#include "platform.h"
+#include "gnunet_fragmentation_lib.h"
+#include "fragmentation.h"
+
+/**
+ * Fragmentation context.
+ */
+struct GNUNET_FRAGMENT_Context
+{
+  /**
+   * Statistics to use.
+   */
+  struct GNUNET_STATISTICS_Handle *stats;
+
+  /**
+   * Tracker for flow control.
+   */
+  struct GNUNET_BANDWIDTH_Tracker *tracker;
+
+  /**
+   * Current expected delay for ACKs.
+   */
+  struct GNUNET_TIME_Relative delay;
+
+  /**
+   * Message to fragment (allocated at the end of this struct).
+   */
+  const struct GNUNET_MessageHeader *msg;
+
+  /**
+   * Function to call for transmissions.
+   */
+  GNUNET_FRAGMENT_MessageProcessor proc;
+
+  /**
+   * Closure for 'proc'.
+   */
+  void *proc_cls;
+
+  /**
+   * Bitfield, set to 1 for each unacknowledged fragment.
+   */
+  uint64_t acks;
+
+  /**
+   * Task performing work for the fragmenter.
+   */
+  GNUNET_SCHEDULER_TaskIdentifier task;
+
+  /**
+   * Target fragment size.
+   */
+  uint16_t mtu;
+  
+};
+
+
+/**
+ * Transmit the next fragment to the other peer.
+ *
+ * @param cls the 'struct GNUNET_FRAGMENT_Context'
+ * @param tc scheduler context
+ */
+static void
+transmit_next (void *cls,
+               const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+  struct GNUNET_FRAGMENT_Context *fc = cls;
+
+  fc->task = GNUNET_SCHEDULER_NO_TASK;
+}
+
+
+/**
+ * Create a fragmentation context for the given message.
+ * Fragments the message into fragments of size "mtu" or
+ * less.  Calls 'proc' on each un-acknowledged fragment,
+ * using both the expected 'delay' between messages and
+ * acknowledgements and the given 'tracker' to guide the
+ * frequency of calls to 'proc'.
+ *
+ * @param stats statistics context
+ * @param mtu the maximum message size for each fragment
+ * @param tracker bandwidth tracker to use for flow control (can be NULL)
+ * @param delay expected delay between fragment transmission
+ *              and ACK based on previous messages
+ * @param msg the message to fragment
+ * @param proc function to call for each fragment to transmit
+ * @param proc_cls closure for proc
+ * @return the fragmentation context
+ */
+struct GNUNET_FRAGMENT_Context *
+GNUNET_FRAGMENT_context_create (struct GNUNET_STATISTICS_Handle *stats,
+                                uint16_t mtu,
+                                struct GNUNET_BANDWIDTH_Tracker *tracker,
+                                struct GNUNET_TIME_Relative delay,
+                                const struct GNUNET_MessageHeader *msg,
+                                GNUNET_FRAGMENT_MessageProcessor proc,
+                                void *proc_cls)
+{
+  struct GNUNET_FRAGMENT_Context *fc;
+  size_t size;
+  uint64_t bits;
+  
+  GNUNET_assert (mtu >= 1024 + sizeof (struct FragmentHeader));
+  size = ntohs (msg->size);
+  GNUNET_assert (size > mtu);
+  fc = GNUNET_malloc (sizeof (struct GNUNET_FRAGMENT_Context) + size);
+  fc->stats = stats;
+  fc->mtu = mtu;
+  fc->tracker = tracker;
+  fc->delay = delay;
+  fc->msg = (const struct GNUNET_MessageHeader*)&fc[1];
+  fc->proc = proc;
+  fc->proc_cls = proc_cls;
+  memcpy (&fc[1], msg, size);
+  bits = (size + mtu - 1) / (mtu - sizeof (struct FragmentHeader));
+  GNUNET_assert (bits <= 64);
+  if (bits == 64)
+    fc->acks = UINT64_MAX;      /* set all 64 bit */
+  else
+    fc->acks = (1 << bits) - 1; /* set lowest 'bits' bit */
+  fc->task = GNUNET_SCHEDULER_add_delayed (GNUNET_BANDWIDTH_tracker_get_delay (tracker, mtu),
+                                           &transmit_next,
+                                           fc);
+  return fc;
+}
+
+
+/**
+ * Process an acknowledgement message we got from the other
+ * side (to control re-transmits).
+ *
+ * @param fc fragmentation context
+ * @param msg acknowledgement message we received
+ * @return GNUNET_OK if this ack completes the work of the 'fc'
+ *                   (all fragments have been received);
+ *         GNUNET_NO if more messages are pending
+ *         GNUNET_SYSERR if this ack is not valid for this fc
+ */
+int 
+GNUNET_FRAGMENT_process_ack (struct GNUNET_FRAGMENT_Context *fc,
+                             const struct GNUNET_MessageHeader *msg)
+{
+  return GNUNET_SYSERR;
+}
+
+
+/**
+ * Destroy the given fragmentation context (stop calling 'proc', free
+ * resources).
+ *
+ * @param fc fragmentation context
+ * @return average delay between transmission and ACK for the
+ *         last message, FOREVER if the message was not fully transmitted
+ */
+struct GNUNET_TIME_Relative
+GNUNET_FRAGMENT_context_destroy (struct GNUNET_FRAGMENT_Context *fc)
+{
+  struct GNUNET_TIME_Relative ret;
+
+  if (fc->task != GNUNET_SCHEDULER_NO_TASK)
+    GNUNET_SCHEDULER_cancel (fc->task);
+  ret = fc->delay;
+  GNUNET_free (fc);
+  return ret;
+}
+
+/* end of fragmentation_new.c */
+