nvmseek2.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 nvmseek2 (signd fd, char const * filename, struct nvm_header2 * nvm_header, uint32_t imagetype);
     *
     *   nvm.h
     *
     *   search a panther/lynx PIB file for the next image of a given
     *   type; return 0 on success or -1 on failure to find another
     *   image of the given type;
     *
     *   the call must provide an image header strucuture for use while
     *   searching; on success, that structure will contain information
     *   about the image and file will be positioned to the start of
     *   the image;
     *
     *
     *--------------------------------------------------------------------*/

    #ifndef NVMSEEK2_SOURCE
    #define NVMSEEK2_SOURCE

    #include <unistd.h>

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

    signed nvmseek2 (signed fd, char const * filename, struct nvm_header2 * nvm_header, uint32_t imagetype)

    {
    	unsigned module = 0;
    	uint32_t origin = ~0;
    	uint32_t offset = 0;
    	do
    	{
    		if (read (fd, nvm_header, sizeof (* nvm_header)) != sizeof (* nvm_header))
    		{
    			error (1, errno, NVM_HDR_CANTREAD, filename, module);
    		}
    		if (LE16TOH (nvm_header->MajorVersion) != 1)
    		{
    			error (1, 0, "(0) " NVM_HDR_VERSION , filename, module);
    		}
    		if (LE16TOH (nvm_header->MinorVersion) != 1)
    		{
    			error (1, 0, "(1) " NVM_HDR_VERSION, filename, module);
    		}
    		if (checksum32 (nvm_header, sizeof (* nvm_header), 0))
    		{
    			error (1, 0, NVM_HDR_CHECKSUM, filename, module);
    		}
    		if (LE32TOH (nvm_header->PrevHeader) != origin)
    		{
    			error (1, 0, NVM_HDR_LINK, filename, module);
    		}
    		if (LE32TOH (nvm_header->ImageType) == imagetype)
    		{
    			return (0);
    		}
    		if (fdchecksum32 (fd, LE32TOH (nvm_header->ImageLength), nvm_header->ImageChecksum))
    		{
    			error (1, ECANCELED, NVM_IMG_CHECKSUM, filename, module);
    		}
    		origin = offset;
    		offset = LE32TOH (nvm_header->NextHeader);
    		module++;
    	}
    	while (~nvm_header->NextHeader);
    	if (lseek (fd, 0, SEEK_CUR) != lseek (fd, 0, SEEK_END))
    	{
    		error (1, errno, NVM_HDR_LINK, filename, module);
    	}
    	if (lseek (fd, 0, SEEK_SET))
    	{
    		error (1, errno, FILE_CANTHOME, filename);
    	}
    	return (-1);
    }

    #endif

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