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/*
 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * See the COPYRIGHT file distributed with this work for additional
 * information regarding copyright ownership.
 */


#ifndef ISC_LFSR_H
#define ISC_LFSR_H 1

/*! \file isc/lfsr.h */

#include <isc/lang.h>
#include <isc/types.h>

typedef struct isc_lfsr isc_lfsr_t;

/*%
 * This function is called when reseeding is needed.  It is allowed to
 * modify any state in the LFSR in any way it sees fit OTHER THAN "bits".
 *
 * It MUST set "count" to a new value or the lfsr will never reseed again.
 *
 * Also, a reseed will never occur in the middle of an extraction.  This
 * is purely an optimization, and is probably what one would want.
 */
typedef void (*isc_lfsrreseed_t)(isc_lfsr_t *, void *);

/*%
 * The members of this structure can be used by the application, but care
 * needs to be taken to not change state once the lfsr is in operation.
 */
struct isc_lfsr {
	isc_uint32_t		state;	/*%< previous state */
	unsigne