ModuleSpec.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 ModuleSpec (struct _file_ * module, struct vs_module_spec * vs_module_spec);
     *
     *   plc.h
     *
     *   compute file length and checksum for module operation functions;
     *   struct vs_module_spec is defined in plc.h;
     *
     *
     *--------------------------------------------------------------------*/

    #ifndef MODULESPEC_SOURCE
    #define MODULESPEC_SOURCE

    #include "../tools/error.h"
    #include "../tools/files.h"
    #include "../plc/plc.h"

    signed ModuleSpec (struct _file_ * file, struct vs_module_spec * spec)

    {
    	off_t length;
    	if ((length = lseek (file->file, 0, SEEK_END)) == -1)
    	{
    		error (1, errno, FILE_CANTSIZE, file->name);
    	}

    #if 1

    	if (length % sizeof (uint32_t))
    	{
    		error (1, ENOTSUP, "%s not multiple of " SIZE_T_SPEC " bytes", file->name, sizeof (uint32_t));
    	}

    #endif

    	if (lseek (file->file, 0, SEEK_SET))
    	{
    		error (1, errno, FILE_CANTHOME, file->name);
    	}
    	spec->MODULE_LENGTH = length;
    	spec->MODULE_CHKSUM = fdchecksum32 (file->file, length, 0);
    	if (lseek (file->file, 0, SEEK_SET))
    	{
    		error (1, errno, FILE_CANTHOME, file->name);
    	}
    	return (0);
    }

    #endif

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