csu3_am335x/EVSE/GPL/open-plc-utils-0.3/nvm/nvmfile.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
 *   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 nvmfile (struct _file_ const * file);
 *
 *   nvm.h
 *
 *   open an NVM file and validate it by walking the header and image
 *   chain and validating all checksums; rewind valid files; return a
 *   file descriptor on success or terminate the program on error;
 *
 *   the checksum of the entire header, including header checksum, is
 *   always 0 for valid headers; similarly, the checksum of the image
 *   and image checksum is always 0 for valid images;
 *
 *
 *   Contributor(s):
 *	Charles Maier
 *
 *--------------------------------------------------------------------*/

#ifndef NVMFILE_SOURCE
#define NVMFILE_SOURCE

#include "../tools/endian.h"
#include "../tools/files.h"
#include "../tools/error.h"
#include "../nvm/nvm.h"

signed nvmfile (struct _file_ const * file)

{
	uint32_t version;
	if (lseek (file->file, 0, SEEK_SET))
	{
		error (1, errno, FILE_CANTHOME, file->name);
	}
	if (read (file->file, &version, sizeof (version)) != sizeof (version))
	{
		error (1, errno, FILE_CANTREAD, file->name);
	}
	if (lseek (file->file, 0, SEEK_SET))
	{
		error (1, errno, FILE_CANTHOME, file->name);
	}
	if (LE32TOH (version) == 0x60000000)
	{
		return (nvmfile1 (file));
	}
	return (nvmfile2 (file));
}


#endif