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/*
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 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 core/gnunet-service-core_typemap.c
* @brief management of map that specifies which message types this peer supports
* @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_transport_service.h"
#include "gnunet-service-core.h"
#include "gnunet-service-core_sessions.h"
#include "gnunet-service-core_typemap.h"
#include <zlib.h>
/**
* A type map describing which messages a given neighbour is able
* to process.
*/
struct GSC_TypeMap
{
uint32_t bits[(UINT16_MAX + 1) / 32];
};
/**
* Bitmap of message types this peer is able to handle.
*/
static struct GSC_TypeMap my_type_map;
/**
* Counters for message types this peer is able to handle.
*/
static uint8_t map_counters[UINT16_MAX + 1];
/**
* Compute a type map message for this peer.
*
* @return this peers current type map message.
*/
struct GNUNET_MessageHeader *
GSC_TYPEMAP_compute_type_map_message ()
{
char *tmp;
uLongf dlen;
struct GNUNET_MessageHeader *hdr;
#ifdef compressBound
dlen = compressBound (sizeof (my_type_map));
#else
dlen = sizeof (my_type_map) + (sizeof (my_type_map) / 100) + 20;
/* documentation says 100.1% oldSize + 12 bytes, but we
* should be able to overshoot by more to be safe */
#endif
hdr = GNUNET_malloc (dlen + sizeof (struct GNUNET_MessageHeader));
hdr->size = htons ((uint16_t) dlen + sizeof (struct GNUNET_MessageHeader));
tmp = (char *) &hdr[1];
if ((Z_OK !=
compress2 ((Bytef *) tmp, &dlen, (const Bytef *) &my_type_map,
sizeof (my_type_map), 9)) || (dlen >= sizeof (my_type_map)))
{
dlen = sizeof (my_type_map);
memcpy (tmp, &my_type_map, sizeof (my_type_map));
hdr->type = htons (GNUNET_MESSAGE_TYPE_CORE_BINARY_TYPE_MAP);
}
else
{
hdr->type = htons (GNUNET_MESSAGE_TYPE_CORE_COMPRESSED_TYPE_MAP);
}
return hdr;
}
/**
* Send my type map to all connected peers (it got changed).
*/
static void
broadcast_my_type_map ()
{
struct GNUNET_MessageHeader *hdr;
hdr = GSC_TYPEMAP_compute_type_map_message ();
GSC_SESSIONS_broadcast (hdr);
GNUNET_free (hdr);
}
/**
* Add a set of types to our type map.
*/
void
GSC_TYPEMAP_add (const uint16_t *types,
unsigned int tlen)
{
unsigned int i;
int changed;
changed = GNUNET_NO;
for (i=0;i<tlen;i++)
{
if (0 == map_counters[types[i]]++)
{
my_type_map.bits[types[i] / 32] |= (1 << (types[i] % 32));
changed = GNUNET_YES;
}
}
if (GNUNET_YES == changed)
broadcast_my_type_map ();
}
/**
* Remove a set of types from our type map.
*/
void
GSC_TYPEMAP_remove (const uint16_t *types,
unsigned int tlen)
{
unsigned int i;
int changed;
changed = GNUNET_NO;
for (i=0;i<tlen;i++)
{
if (0 == --map_counters[types[i]])
{
my_type_map.bits[types[i] / 32] &= ~(1 << (types[i] % 32));
changed = GNUNET_YES;
}
}
if (GNUNET_YES == changed)
broadcast_my_type_map ();
}
/**
* Test if any of the types from the types array is in the
* given type map.
*
* @param map map to test
* @param types array of types
* @param tcnt number of entries in types
* @return GNUNET_YES if a type is in the map, GNUNET_NO if not
*/
int
GSC_TYPEMAP_test_match (const struct GSC_TypeMap *tmap,
const uint16_t *types,
unsigned int tcnt)
{
unsigned int i;
for (i=0;i<tcnt;i++)
if (0 != (my_type_map.bits[types[i] / 32] & (1 << (types[i] % 32))))
return GNUNET_YES;
return GNUNET_NO;
}
/**
* Initialize typemap subsystem.
*/
void
GSC_TYPEMAP_init ()
{
/* nothing to do */
}
/**
* Shutdown typemap subsystem.
*/
void
GSC_TYPEMAP_done ()
{
/* nothing to do */
}
/* end of gnunet-service-core_typemap.c */
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