csu3_am335x/EVSE/GPL/open-plc-utils-0.3/plc/ReadFMI.c

/*====================================================================*
 *
 *   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
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 *   NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 *   OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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 *--------------------------------------------------------------------*/

/*====================================================================*
 *
 *   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
 *      Nathaniel Houghton
 *
 *--------------------------------------------------------------------*/

#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