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3 (C) 2009, 2011 Christian Grothoff (and other contributing authors)
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21 * @file include/gnunet_fragmentation_lib.h
22 * @brief library to help fragment messages
23 * @author Christian Grothoff
26 #ifndef GNUNET_FRAGMENTATION_LIB_H
27 #define GNUNET_FRAGMENTATION_LIB_H
29 #include "gnunet_util_lib.h"
30 #include "gnunet_bandwidth_lib.h"
31 #include "gnunet_statistics_service.h"
36 #if 0 /* keep Emacsens' auto-indent happy */
43 * Fragmentation context.
45 struct GNUNET_FRAGMENT_Context;
49 * Function that is called with messages
50 * created by the fragmentation module.
53 * @param msg the message that was created
55 typedef void (*GNUNET_FRAGMENT_MessageProcessor) (void *cls,
56 const struct GNUNET_MessageHeader *msg);
60 * Create a fragmentation context for the given message.
61 * Fragments the message into fragments of size "mtu" or
62 * less. Calls 'proc' on each un-acknowledged fragment,
63 * using both the expected 'delay' between messages and
64 * acknowledgements and the given 'tracker' to guide the
65 * frequency of calls to 'proc'.
67 * @param stats statistics context
68 * @param mtu the maximum message size for each fragment
69 * @param tracker bandwidth tracker to use for flow control (can be NULL)
70 * @param delay expected delay between fragment transmission
71 * and ACK based on previous messages
72 * @param msg the message to fragment
73 * @param proc function to call for each fragment to transmit
74 * @param proc_cls closure for proc
75 * @return the fragmentation context
77 struct GNUNET_FRAGMENT_Context *
78 GNUNET_FRAGMENT_context_create (struct GNUNET_STATISTICS_Handle *stats,
80 struct GNUNET_BANDWIDTH_Tracker *tracker,
81 struct GNUNET_TIME_Relative delay,
82 const struct GNUNET_MessageHeader *msg,
83 GNUNET_FRAGMENT_MessageProcessor proc,
88 * Process an acknowledgement message we got from the other
89 * side (to control re-transmits).
91 * @param fc fragmentation context
92 * @param msg acknowledgement message we received
93 * @return GNUNET_OK if this ack completes the work of the 'fc'
94 * (all fragments have been received);
95 * GNUNET_NO if more messages are pending
96 * GNUNET_SYSERR if this ack is not valid for this fc
98 int GNUNET_FRAGMENT_process_ack (struct GNUNET_FRAGMENT_Context *fc,
99 const struct GNUNET_MessageHeader *msg);
103 * Destroy the given fragmentation context (stop calling 'proc', free
106 * @param fc fragmentation context
107 * @return average delay between transmission and ACK for the
108 * last message, FOREVER if the message was not fully transmitted
110 struct GNUNET_TIME_Relative
111 GNUNET_FRAGMENT_context_destroy (struct GNUNET_FRAGMENT_Context *fc);
115 * Defragmentation context (one per connection).
117 struct GNUNET_DEFRAGMENT_Context;
121 * Create a defragmentation context.
123 * @param stats statistics context
124 * @param mtu the maximum message size for each fragment
125 * @param num_msgs how many fragmented messages
126 * to we defragment at most at the same time?
127 * @param cls closure for proc and ackp
128 * @param proc function to call with defragmented messages
129 * @param ackp function to call with acknowledgements (to send
130 * back to the other side)
131 * @return the defragmentation context
133 struct GNUNET_DEFRAGMENT_Context *
134 GNUNET_DEFRAGMENT_context_create (struct GNUNET_STATISTICS_Handle *stats,
136 unsigned int num_msgs,
138 GNUNET_FRAGMENT_MessageProcessor proc,
139 GNUNET_FRAGMENT_MessageProcessor ackp);
143 * Destroy the given defragmentation context.
145 * @param dc defragmentation context
148 GNUNET_DEFRAGMENT_context_destroy (struct GNUNET_DEFRAGMENT_Context *dc);
152 * We have received a fragment. Process it.
154 * @param dc the context
155 * @param msg the message that was received
158 GNUNET_DEFRAGMENT_process_fragment (struct GNUNET_DEFRAGMENT_Context *dc,
159 const struct GNUNET_MessageHeader *msg);
162 #if 0 /* keep Emacsens' auto-indent happy */
169 /* end of gnunet_fragmentation_lib.h */