Source: ../../libproto/checksum.h
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/* -*- c-basic-offset: 4; tab-width: 8; indent-tabs-mode: t -*- */
/*
* Copyright (c) 2001-2008 XORP, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License, Version
* 2.1, June 1999 as published by the Free Software Foundation.
* Redistribution and/or modification of this program under the terms of
* any other version of the GNU Lesser General Public License is not
* permitted.
*
* This program 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. For more details,
* see the GNU Lesser General Public License, Version 2.1, a copy of
* which can be found in the XORP LICENSE.lgpl file.
*
* XORP, Inc, 2953 Bunker Hill Lane, Suite 204, Santa Clara, CA 95054, USA;
* http://xorp.net
*/
/*
* $XORP: xorp/libproto/checksum.h,v 1.6 2008/10/02 21:57:17 bms Exp $
*/
#ifndef __LIBPROTO_CHECKSUM_H__
#define __LIBPROTO_CHECKSUM_H__
/*
* Header file for checksum computations.
*/
# ifdef __cplusplus
extern "C" {
# endif
/**
* Checksum computation for Internet Protocol family headers.
*
* @param addr the address with the data.
* @param len the length of the data.
* @return the calculated checksum (in network order).
*/
extern uint16_t inet_checksum(const uint8_t *addr, size_t len);
/**
* Add two previously computed checksums for Internet Protocol family header.
*
* Note that if both checksums to add are in host order, the result is also in
* host order. Similarly, if both checksums to add are in network order, the
* result is also in network order.
*
* @param sum1 the first sum to add.
* @param sum2 the second sum to add.
* @return the sum of the two checksums.
*/
extern uint16_t inet_checksum_add(uint16_t sum1, uint16_t sum2);
# ifdef __cplusplus
}
# endif
#endif /* __LIBPROTO_CHECKSUM_H__ */
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