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transmission/libtransmission/peertree.h
2007-03-23 08:28:01 +00:00

145 lines
4.2 KiB
C

/******************************************************************************
* $Id$
*
* Copyright (c) 2007 Transmission authors and contributors
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*****************************************************************************/
#include "bsdtree.h"
typedef struct tr_peertree_entry_s
{
RB_ENTRY( tr_peertree_entry_s ) magic;
uint8_t peer[6];
} tr_peertree_entry_t;
typedef
RB_HEAD( tr_peertree_s, tr_peertree_entry_s )
tr_peertree_t;
#define peertreeInit(tree) RB_INIT( (tree) )
#define peertreeEmpty(tree) RB_EMPTY( (tree) )
#define peertreeFirst(tree) RB_MIN( tr_peertree_s, (tree) )
#define peertreeNext(tree, item) RB_NEXT( tr_peertree_s, (tree), (item) )
#define peertreeFind(tree, item) RB_FIND( tr_peertree_s, (tree), (item) )
static inline int
peertreekeycmp( tr_peertree_entry_t * aa, tr_peertree_entry_t * bb )
{
return memcmp( aa->peer, bb->peer, 6 );
}
RB_GENERATE_STATIC( tr_peertree_s, tr_peertree_entry_s, magic, peertreekeycmp );
static int
peertreeCount( tr_peertree_t * tree )
{
tr_peertree_entry_t * ii;
int count;
count = 0;
RB_FOREACH( ii, tr_peertree_s, tree )
{
count++;
}
return count;
}
static tr_peertree_entry_t *
peertreeGet( tr_peertree_t * tree, struct in_addr * addr, in_port_t port )
{
tr_peertree_entry_t entry;
memset( &entry, 0, sizeof( entry ) );
memcpy( entry.peer, addr, 4 );
memcpy( entry.peer + 4, &port, 2 );
return RB_FIND( tr_peertree_s, tree, &entry );
}
static tr_peertree_entry_t *
peertreeAdd( tr_peertree_t * tree, struct in_addr * addr, in_port_t port )
{
tr_peertree_entry_t * entry;
entry = calloc( 1, sizeof( *entry) );
if( NULL == entry )
{
return NULL;
}
memcpy( entry->peer, addr, 4 );
memcpy( entry->peer + 4, &port, 2 );
if( NULL == RB_INSERT( tr_peertree_s, tree, entry ) )
{
return entry;
}
free( entry );
return NULL;
}
static void
peertreeMove( tr_peertree_t * dest, tr_peertree_t * src,
tr_peertree_entry_t * entry )
{
tr_peertree_entry_t * sanity;
sanity = RB_REMOVE( tr_peertree_s, src, entry );
assert( sanity == entry );
sanity = RB_INSERT( tr_peertree_s, dest, entry );
assert( NULL == sanity );
}
static void
peertreeMerge( tr_peertree_t * dest, tr_peertree_t * src )
{
tr_peertree_entry_t * ii, * next, * sanity;
for( ii = peertreeFirst( src ); NULL != ii; ii = next )
{
next = peertreeNext( src, ii );
sanity = RB_REMOVE( tr_peertree_s, src, ii );
assert( sanity == ii );
sanity = RB_INSERT( tr_peertree_s, dest, ii );
assert( NULL == sanity );
}
}
static void
peertreeSwap( tr_peertree_t * dest, tr_peertree_t * src )
{
tr_peertree_t buf;
RB_ROOT( &buf ) = RB_ROOT( dest );
RB_ROOT( dest ) = RB_ROOT( src );
RB_ROOT( src ) = RB_ROOT( &buf );
}
static void
peertreeFree( tr_peertree_t * tree )
{
tr_peertree_entry_t * ii, * next;
for( ii = RB_MIN( tr_peertree_s, tree ); NULL != ii; ii = next )
{
next = RB_NEXT( tr_peertree_s, tree, ii );
RB_REMOVE( tr_peertree_s, tree, ii );
free( ii );
}
}