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/*
* Copyright (c) 2002-2018 Balabit
* Copyright (c) 2018 Laszlo Budai <laszlo.budai@balabit.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As an additional exemption you are allowed to compile & link against the
* OpenSSL libraries as published by the OpenSSL project. See the file
* COPYING for details.
*
*/
#include "window-size-counter.h"
#define COUNTER_MASK (((gsize)1<<(8*sizeof(gsize)-1)) - 1)
static const gsize COUNTER_MAX = COUNTER_MASK;
static const gsize SUSPEND_MASK = G_MAXSIZE ^ COUNTER_MASK;
static const gsize RESUME_MASK = G_MAXSIZE >> 1;
static gboolean
_is_suspended(gsize v)
{
return (v == 0) || ((v & SUSPEND_MASK) == SUSPEND_MASK);
}
gsize
window_size_counter_get_max(void)
{
return COUNTER_MAX;
}
void
window_size_counter_set(WindowSizeCounter *c, gsize value)
{
atomic_gssize_set(&c->counter, value & COUNTER_MASK);
}
gsize
window_size_counter_get(WindowSizeCounter *c, gboolean *suspended)
{
gsize v = atomic_gssize_get_unsigned(&c->counter);
if (suspended)
*suspended = _is_suspended(v);
return v & COUNTER_MASK;
}
gsize
window_size_counter_add(WindowSizeCounter *c, gsize value, gboolean *suspended)
{
gsize v = (gsize)atomic_gssize_add(&c->counter, value);
gsize old_value = v & COUNTER_MASK;
g_assert (old_value + value <= COUNTER_MAX);
if (suspended)
*suspended = _is_suspended(v);
return old_value;
}
gsize
window_size_counter_sub(WindowSizeCounter *c, gsize value, gboolean *suspended)
{
gsize v = (gsize)atomic_gssize_add(&c->counter, -1 * value);
gsize old_value = v & COUNTER_MASK;
g_assert (old_value >= value);
if (suspended)
*suspended = _is_suspended(v);
return old_value;
}
void
window_size_counter_suspend(WindowSizeCounter *c)
{
atomic_gssize_or(&c->counter, SUSPEND_MASK);
}
void
window_size_counter_resume(WindowSizeCounter *c)
{
atomic_gssize_and(&c->counter, RESUME_MASK);
}
gboolean
window_size_counter_suspended(WindowSizeCounter *c)
{
gsize v = atomic_gssize_get_unsigned(&c->counter);
return _is_suspended(v);
}
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