/* * Copyright 2004 Freescale Semiconductor, Inc. All Rights Reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA *//*! * @file mxc_nb_crcgen.c *  * @brief This is an utility program to write crc and image size in Linux kernel * image. * * This program reads Linux kernel image and generates 'Addition CRC'. It  * writes the 4 bytes of size and generated crc value at the beginning of the  * Linux kernel image. * * @ingroup NANDboot */#include<stdio.h>typedef unsigned int U32;typedef unsigned char U8;int main(void){        U32 crc = 0;        U32 i = 0;        U8 ch;        FILE *frd, *fwt;        fpos_t *pos;        char *imgcrc = "./bin/Image_crc";        char *img = "./image/Image";        /* create new image 'Image_crc' with the size and crc written on it */        fwt = fopen(imgcrc, "wb");        if (!fwt) {                printf("Failed to create %s\n", imgcrc);                return 1;          }        /* open to read the Linux kernel image from image folder */        frd = fopen(img, "rb");        if (frd) {                while (fread(&ch, 1, 1, frd)) {                        /*                          * generate crc by adding each byte from the Linux                         * kernel image file. The CRC is addition checksum.                         */                        crc += ch;                        i++;                }                printf("Image size %d crc %d\n", i, crc);                /* write 4 bytes of size at the beginning of new image */                fwrite(&i, 4, 1, fwt);                /* write 4 bytes of crc after size at the beginning of image */                fwrite(&crc, 4, 1, fwt);                /* set the file pointer at start of the file */                rewind(frd);                /* copy the Linux kernel image byte by byte to image */                while (fread(&ch, 1, 1, frd)) {                                 fwrite(&ch, 1, 1, fwt);                }                fclose(frd);    /* close file */        } else {                printf("Failed to open %s\n", img);                return 1;          }        fclose(fwt);    /* close file */        return 0;}