memencode.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.
     *
     *--------------------------------------------------------------------*/

    /*====================================================================*
     *
     *   unsigned memencode (void * memory, size_t extent, char const * format, char const * string);
     *
     *   memory.h
     *
     *--------------------------------------------------------------------*/

    #ifndef MEMENCODE_SOURCE
    #define MEMENCODE_SOURCE

    #include <string.h>

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

    static size_t memstring (void * memory, size_t extent, char const * format, char const * string, size_t length)

    {
    	if (extent < length)
    	{
    		error (1, ECANCELED, "Overflow at %s %s", format, string);
    	}
    	memset (memory, 0, length);
    	strncpy (memory, string, length-1);
    	return (length);
    }

    size_t memencode (void * memory, size_t extent, char const * format, char const * string)

    {
    	if (!strcmp (format, "byte"))
    	{
    		uint8_t * number = (uint8_t *)(memory);
    		if (extent < sizeof (* number))
    		{
    			error (1, ECANCELED, "Overflow at %s %s", format, string);
    		}
    		* number = (uint8_t)(basespec (string, 0, sizeof (* number)));
    		return (sizeof (* number));
    	}
    	if (!strcmp (format, "word"))
    	{
    		uint16_t * number = (uint16_t *)(memory);
    		if (extent < sizeof (* number))
    		{
    			error (1, ECANCELED, "Overflow at %s %s", format, string);
    		}
    		* number = (uint16_t)(basespec (string, 0, sizeof (* number)));
    		* number = HTOLE16 (* number);
    		return (sizeof (* number));
    	}
    	if (!strcmp (format, "long"))
    	{
    		uint32_t * number = (uint32_t *)(memory);
    		if (extent < sizeof (* number))
    		{
    			error (1, ECANCELED, "Overflow at %s %s", format, string);
    		}
    		* number = (uint32_t)(basespec (string, 0, sizeof (* number)));
    		* number = HTOLE32 (* number);
    		return (sizeof (* number));
    	}
    	if (!strcmp (format, "huge"))
    	{
    		uint64_t * number = (uint64_t *)(memory);
    		if (extent < sizeof (* number))
    		{
    			error (1, ECANCELED, "Overflow at %s %s", format, string);
    		}
    		* number = (uint64_t)(basespec (string, 0, sizeof (* number)));
    		* number = HTOLE64 (* number);
    		return (sizeof (* number));
    	}
    	if (!strcmp (format, "text"))
    	{
    		extent = (unsigned)(strlen (string));
    		memcpy (memory, string, extent);
    		return (extent);
    	}
    	if (!strcmp (format, "data"))
    	{
    		extent = (unsigned)(dataspec (string, memory, extent));
    		return (extent);
    	}
    	if (!strcmp (format, "fill"))
    	{
    		extent = (unsigned)(uintspec (string, 0, extent));
    		memset (memory, ~0, extent);
    		return (extent);
    	}
    	if (!strcmp (format, "zero"))
    	{
    		extent = (unsigned)(uintspec (string, 0, extent));
    		memset (memory, 0, extent);
    		return (extent);
    	}
    	if (!strcmp (format, "skip"))
    	{
    		extent = (unsigned)(uintspec (string, 0, extent));
    		return (extent);
    	}

    #if 1

    /*
     *   tr-069 specific fields that don't really belong in the PIB;
     */

    	if (!strcmp (format, "adminusername") || !strcmp (format, "adminpassword") || !strcmp (format, "accessusername"))
    	{
    		return (memstring (memory, extent, format, string, PIB_NAME_LEN + 1));
    	}
    	if (!strcmp (format, "accesspassword"))
    	{
    		return (memstring (memory, extent, format, string, PIB_HFID_LEN + 1));
    	}
    	if (!strcmp (format, "username") || !strcmp (format, "password") || !strcmp (format, "url"))
    	{
    		return (memstring (memory, extent, format, string, PIB_TEXT_LEN + 1));
    	}

    #endif

    #if 1

    /*
     *   HPAV specific fields that belong in the PIB;
     */

    	if (!strcmp (format, "hfid"))
    	{
    		return (memstring (memory, extent, format, string, PIB_HFID_LEN));
    	}
    	if (!strcmp (format, "mac"))
    	{
    		return (bytespec (string, memory, ETHER_ADDR_LEN));
    	}
    	if (!strcmp (format, "key"))
    	{
    		return (bytespec (string, memory, PIB_KEY_LEN));
    	}

    #endif

    	error (1, ENOTSUP, "%s", format);
    	return (0);
    }

    #endif

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