2 This file is part of GNUnet.
3 (C) 2011 Christian Grothoff (and other contributing authors)
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6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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22 * @file core/gnunet-service-core_typemap.c
23 * @brief management of map that specifies which message types this peer supports
24 * @author Christian Grothoff
27 #include "gnunet_util_lib.h"
28 #include "gnunet_transport_service.h"
29 #include "gnunet-service-core.h"
30 #include "gnunet-service-core_sessions.h"
31 #include "gnunet-service-core_typemap.h"
36 * A type map describing which messages a given neighbour is able
41 uint32_t bits[(UINT16_MAX + 1) / 32];
45 * Bitmap of message types this peer is able to handle.
47 static struct GSC_TypeMap my_type_map;
50 * Counters for message types this peer is able to handle.
52 static uint8_t map_counters[UINT16_MAX + 1];
56 * Compute a type map message for this peer.
58 * @return this peers current type map message.
60 struct GNUNET_MessageHeader *
61 GSC_TYPEMAP_compute_type_map_message ()
65 struct GNUNET_MessageHeader *hdr;
68 dlen = compressBound (sizeof (my_type_map));
70 dlen = sizeof (my_type_map) + (sizeof (my_type_map) / 100) + 20;
71 /* documentation says 100.1% oldSize + 12 bytes, but we
72 * should be able to overshoot by more to be safe */
74 hdr = GNUNET_malloc (dlen + sizeof (struct GNUNET_MessageHeader));
75 hdr->size = htons ((uint16_t) dlen + sizeof (struct GNUNET_MessageHeader));
76 tmp = (char *) &hdr[1];
78 compress2 ((Bytef *) tmp, &dlen, (const Bytef *) &my_type_map,
79 sizeof (my_type_map), 9)) || (dlen >= sizeof (my_type_map)))
81 dlen = sizeof (my_type_map);
82 memcpy (tmp, &my_type_map, sizeof (my_type_map));
83 hdr->type = htons (GNUNET_MESSAGE_TYPE_CORE_BINARY_TYPE_MAP);
87 hdr->type = htons (GNUNET_MESSAGE_TYPE_CORE_COMPRESSED_TYPE_MAP);
94 * Send my type map to all connected peers (it got changed).
97 broadcast_my_type_map ()
99 struct GNUNET_MessageHeader *hdr;
101 hdr = GSC_TYPEMAP_compute_type_map_message ();
102 GSC_SESSIONS_broadcast (hdr);
108 * Add a set of types to our type map.
111 GSC_TYPEMAP_add (const uint16_t *types,
120 if (0 == map_counters[types[i]]++)
122 my_type_map.bits[types[i] / 32] |= (1 << (types[i] % 32));
123 changed = GNUNET_YES;
126 if (GNUNET_YES == changed)
127 broadcast_my_type_map ();
132 * Remove a set of types from our type map.
135 GSC_TYPEMAP_remove (const uint16_t *types,
144 if (0 == --map_counters[types[i]])
146 my_type_map.bits[types[i] / 32] &= ~(1 << (types[i] % 32));
147 changed = GNUNET_YES;
150 if (GNUNET_YES == changed)
151 broadcast_my_type_map ();
156 * Test if any of the types from the types array is in the
159 * @param map map to test
160 * @param types array of types
161 * @param tcnt number of entries in types
162 * @return GNUNET_YES if a type is in the map, GNUNET_NO if not
165 GSC_TYPEMAP_test_match (const struct GSC_TypeMap *tmap,
166 const uint16_t *types,
172 if (0 != (my_type_map.bits[types[i] / 32] & (1 << (types[i] % 32))))
179 * Initialize typemap subsystem.
189 * Shutdown typemap subsystem.
197 /* end of gnunet-service-core_typemap.c */