slac_connect.c
Author: cmaier@cmassoc.net

    /*====================================================================*
     *
     *   Copyright (c) 2013 Qualcomm Atheros, Inc.
     *
     *   All rights reserved.
     *
     *   Redistribution and use in source and binary forms, with or
     *   without modification, are permitted (subject to the limitations
     *   in the disclaimer below) provided that the following conditions
     *   are met:
     *
     *   * Redistributions of source code must retain the above copyright
     *     notice, this list of conditions and the following disclaimer.
     *
     *   * Redistributions in binary form must reproduce the above
     *     copyright notice, this list of conditions and the following
     *     disclaimer in the documentation and/or other materials
     *     provided with the distribution.
     *
     *   * Neither the name of Qualcomm Atheros nor the names of
     *     its contributors may be used to endorse or promote products
     *     derived from this software without specific prior written
     *     permission.
     *
     *   NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE
     *   GRANTED BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE
     *   COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
     *   IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     *   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     *   PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
     *   OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     *   NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     *   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     *   HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     *   CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
     *   OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     *   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     *--------------------------------------------------------------------*/

    /*====================================================================*
     *
     *   void slac_connect (struct session * session);
     *
     *   slac.h
     *
     *   compute the arithmetic mean of session attenuation values and
     *   compare to the session limit; average attenuation greater than
     *   the session limit is considered a bad connection;
     *
     *--------------------------------------------------------------------*/

    #ifndef SLAC_AVERAGE_SOURCE
    #define SLAC_AVERAGE_SOURCE

    #include "../tools/error.h"
    #include "../tools/flags.h"
    #include "../tools/memory.h"
    #include "../iso15118/slac.h"

    signed slac_connect (struct session * session)

    {
    	unsigned group = 0;
    	unsigned total = 0;
    	if (session->NumGroups > SIZEOF (session->AAG))
    	{
    		return (slac_debug (session, session->exit, __func__, "Too much data to analyse!"));
    	}
    	if (session->NumGroups > 0)
    	{
    		char string [512];
    		while (group < session->NumGroups)
    		{
    			total += session->AAG [group];
    			group++;
    		}
    		total /= group;
    		if (total > session->limit)
    		{
    			char string [512];
    			slac_debug (session, 0, __func__, "Average attenuation (%u) more than limit (%u) frow %d groups", total, session->limit, group);
    			slac_debug (session, 0, __func__, "%s", HEXSTRING (string, session->AAG));
    			return (- 1);
    		}
    		if (total > 0)
    		{
    			slac_debug (session, 0, __func__, "Average attenuation (%u) less than limit (%u) from %d groups", total, session->limit, group);
    			slac_debug (session, 0, __func__, "%s", HEXSTRING (string, session->AAG));
    			return (0);
    		}
    	}
    	return (slac_debug (session, session->exit, __func__, "Nothing to analyse"));
    }

    #endif

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