ReadFMI.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.
     *
     *--------------------------------------------------------------------*/

    /*====================================================================*
     *
     *   signed ReadFMI (struct plc * plc, uint8_t MMV, uint16_t MMTYPE);
     *
     *   plc.h
     *
     *   read a fragmented message and return a pointer to a buffer that
     *   contains the concatenated message fragments; the buffer address
     *   is returned in plc->content; the calling function must free the
     *   buffer when done; buffer length is computed from the number of
     *   fragments returned in the FMI field of the first fragment;
     *
     *   Contributor(s):
     *      Charles Maier <cmaier@qca.qualcomm.com>
     *      Nathaniel Houghton <nhoughto@qca.qualcomm.com>
     *
     *--------------------------------------------------------------------*/

    #ifndef READFMI_SOURCE
    #define READFMI_SOURCE

    #include <stdint.h>
    #include <stdlib.h>
    #include <memory.h>

    #include "../tools/memory.h"
    #include "../tools/number.h"
    #include "../tools/error.h"
    #include "../plc/plc.h"

    signed ReadFMI (struct plc * plc, uint8_t MMV, uint16_t MMTYPE)

    {
    	if (ReadMME (plc, MMV, MMTYPE) > 0)
    	{
    		struct homeplug * homeplug = (struct homeplug *)(plc->message);
    		unsigned count = ((homeplug->homeplug.FMID >> 0) & 0x0F);
    		unsigned extra = ((homeplug->homeplug.FMID >> 4) & 0x0F);
    		unsigned length = sizeof (* homeplug) + extra * sizeof (homeplug->content);
    		if ((plc->content = malloc (length)))
    		{
    			signed offset = plc->packetsize;
    			memcpy (plc->content, homeplug, offset);
    			while (count < extra)
    			{
    				if (ReadMME (plc, MMV, MMTYPE) <= 0)
    				{
    					free (plc->content);
    					plc->content = NULL;
    					return (- 1);
    				}
    				count = ((homeplug->homeplug.FMID >> 0) & 0x0F);
    				extra = ((homeplug->homeplug.FMID >> 4) & 0x0F);
    				plc->packetsize -= sizeof (struct ethernet_hdr);
    				plc->packetsize -= sizeof (struct homeplug_fmi);
    				memcpy ((uint8_t *)(plc->content) +  offset, homeplug->content, plc->packetsize);
    				offset += plc->packetsize;
    			}
    			plc->packetsize = offset;
    		}
    		else
    		{
    			error (1, errno, "%s", __func__);
    		}
    	}
    	return (plc->packetsize);
    }

    #endif

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