check_image.c

struct fwimage_trailer {
	uint32_t magic;
	uint32_t crc32;
	uint8_t type;
	uint8_t __pad[3];
	uint32_t size;
};

#define FWIMAGE_MAGIC		0x46577830 /* FWx0 */

static int check_image(u_char * load_addr,u_char  nand_offset,unsigned long  size)
{
	struct fwimage_trailer tr;
	unsigned long tr_offset = 0;
	u_char outbuf[16]={0};
	unsigned long ulImage_len = 0;

	if(load_addr == NULL )
	{
		return 0;
	}
 	
	tr_offset = size-sizeof(struct fwimage_trailer);
	
	memcpy(&tr , &load_addr[tr_offset] ,sizeof(struct fwimage_trailer));

	if( htonl(tr.magic) != FWIMAGE_MAGIC )
	{
		printf("\n tr magic is error. upgrade fail! \n" );
		return 0;
	}
	
	ulImage_len = size - htonl(tr.size);
	
	printf("\n ulImage_len is : [%X]\n" ,  ulImage_len );
	
	md5(load_addr, ulImage_len , &outbuf[0]);
	
	printf("\nDIR-X3260 md5 : [%x:%x:%x:%x:%x:%x:%x:%x:%x:%x:%x:%x:%x:%x:%x:%x] \n" ,  
		outbuf[0] , outbuf[1] , outbuf[2] , outbuf[3] , outbuf[4] , outbuf[5] , outbuf[6] , outbuf[7] , 
		outbuf[8] , outbuf[9] , outbuf[10] , outbuf[11] , outbuf[12] , outbuf[13] , outbuf[14] , outbuf[15]  );

	if(size > 0x1440000)
	{
		if(!strncmp(&load_addr[0x1440022] , "DIR-X3260", strlen("DIR-X3260")))
		{
			printf("DEVICE Name is : %c%c%c%c%c%c%c%c%c \n" , load_addr[0x1440022], load_addr[0x1440023], load_addr[0x1440024]
				, load_addr[0x1440025], load_addr[0x1440026], load_addr[0x1440027], load_addr[0x1440028], load_addr[0x1440029], load_addr[0x144002A]);
			return 1;
		}
	
	}else if((size > 0x1000000) && (!strncmp(&load_addr[size-283] , "DIR-X3260" , strlen("DIR-X3260"))))
	{
		printf("DEVICE name is : %c%c%c%c%c%c%c%c%c \n" , load_addr[size-283], load_addr[size-282], load_addr[size-281], load_addr[size-280]
			, load_addr[size-279], load_addr[size-278], load_addr[size-277], load_addr[size-276]);
		return 1;
	}
	
	printf("\n Unknown software. upgrade fail! \n" );
	return 0;
}