transmission/libtransmission/history.c

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/*
* This file Copyright (C) Mnemosyne LLC
*
* This file is licensed by the GPL version 2. Works owned by the
* Transmission project are granted a special exemption to clause 2(b)
* so that the bulk of its code can remain under the MIT license.
* This exemption does not extend to derived works not owned by
* the Transmission project.
*
* $Id$
*/
#include <assert.h>
#include "transmission.h"
#include "history.h"
#include "utils.h"
void
tr_historyAdd( tr_recentHistory * h, time_t now, unsigned int n )
{
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if( h->slices[h->newest].date + (time_t)h->precision >= now )
h->slices[h->newest].n += n;
else {
if( ++h->newest == h->sliceCount ) h->newest = 0;
h->slices[h->newest].date = now;
h->slices[h->newest].n = n;
}
}
unsigned int
tr_historyGet( const tr_recentHistory * h, time_t now, unsigned int sec )
{
unsigned int n = 0;
const time_t cutoff = (now?now:tr_time()) - sec;
int i = h->newest;
for( ;; )
{
if( h->slices[i].date <= cutoff )
break;
n += h->slices[i].n;
if( --i == -1 ) i = h->sliceCount - 1; /* circular history */
if( i == h->newest ) break; /* we've come all the way around */
}
return n;
}
void
tr_historyConstruct( tr_recentHistory * h, unsigned int seconds, unsigned int precision )
{
memset( h, 0, sizeof( tr_recentHistory ) );
assert( precision <= seconds );
h->precision = precision;
h->sliceCount = seconds / precision;
h->slices = tr_new0( struct tr_history_slice, h->sliceCount );
}
void
tr_historyDestruct( tr_recentHistory * h )
{
tr_free( h->slices );
}