#include <iostream>+
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#include <stdlib.h>+
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#include <stdio.h>+
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#include <string.h>+
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#include <time.h>+
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+
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void fletcher16(unsigned char *result1, unsigned char *result2, unsigned char const *data, size_t bytes )+
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{+
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        unsigned short sum1 = 0xff, sum2 = 0xff;+
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        size_t tlen;+
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 +
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        while (bytes) {+
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                tlen = bytes >= 20 ? 20 : bytes;+
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                bytes -= tlen;+
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                do {+
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                        sum2 += sum1 += *data++;+
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                } while (--tlen);+
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                sum1 = (sum1 & 0xff) + (sum1 >> 8);+
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                sum2 = (sum2 & 0xff) + (sum2 >> 8);+
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        }+
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        /* Second reduction step to reduce sums to 8 bits */+
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        sum1 = (sum1 & 0xff) + (sum1 >> 8);+
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        sum2 = (sum2 & 0xff) + (sum2 >> 8);+
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        *result2 = (sum2 & 0xff);+
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        *result1 = (sum1 & 0xff);+
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//        return sum2 << 8 | sum1;+
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}+
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+
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+
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// This is a variant of fletcher16 with a 16 bit sum instead of an 8 bit sum,+
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// and modulo 2^16 instead of 2^16-1+
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void+
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hw_ostc3_firmware_checksum (unsigned char *result1, unsigned char *result2, unsigned char *result3, unsigned char *result4, unsigned char const *data, size_t bytes )+
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{+
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	unsigned short low = 0;+
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	unsigned short high = 0;+
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	for (unsigned int i = 0; i < bytes; i++) {+
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		low  += data[i];+
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		high += low;+
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	}+
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        *result1 = (low & 0xff);+
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        *result2 = (low/256 & 0xff);+
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        *result3 = (unsigned char)(high & 0xff);+
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        *result4 = (unsigned char)((high/256) & 0xff);+
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//	return (((unsigned int)high) << 16) + low;+
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}+
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+
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+
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int main(int argc, char** argv) {+
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	+
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	+
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	FILE *fp, * fpout;+
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	size_t lenTotal,lenTemp;+
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	unsigned char buf[2000000];+
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	char *file = argv[1];+
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	char *file2 =  argv[2];+
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	char *file3 =  argv[3];+
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	unsigned int pruefsumme;+
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	unsigned char buf2[4];+
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+
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   	printf("1: %s\n",  file);+
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   	printf("2: %s\n",  file2);+
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   	printf("3: %s\n",  file3);+
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   	printf("\n");+
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     +
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	+
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		//write File with length and cheksum+
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	char filename[500], filenameout[510] ;+
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	sprintf(filename,"%s",file);+
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	int filelength = strlen(filename);+
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	filename[filelength -4] = 0;+
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	+
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	lenTotal = 0;+
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	if (NULL == (fp = fopen(file, "rb")))+
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	{+
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	    printf("Unable to open %s for reading\n", file);+
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	    return -1;+
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	}+
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	lenTemp = fread(&buf[lenTotal], sizeof(char), sizeof(buf), fp);+
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//	lenTemp = fread(buf, sizeof(char), sizeof(buf), fp);+
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	lenTotal = lenTemp;+
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	printf("%d bytes read (hex: %#x )\n", (uint32_t)lenTemp, (uint32_t)lenTemp);+
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	fclose(fp);+
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+
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	if(file2)+
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	{+
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		if (NULL == (fp = fopen(file2, "rb")))+
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		{+
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		    printf("Unable to open %s for reading\n", file2);+
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		    return -1;+
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		}+
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		lenTemp = fread(&buf[lenTotal], sizeof(char), sizeof(buf)-lenTotal, fp);+
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		lenTotal += lenTemp;+
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		printf("%d bytes read (hex: %#x )\n", (uint32_t)lenTemp, (uint32_t)lenTemp);+
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		fclose(fp);+
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	}+
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	if(file3)+
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	{+
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		if (NULL == (fp = fopen(file3, "rb")))+
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		{+
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		    printf("Unable to open %s for reading\n", file3);+
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		    return -1;+
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		}+
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		lenTemp = fread(&buf[lenTotal], sizeof(char), sizeof(buf)-lenTotal, fp);+
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		lenTotal += lenTemp;+
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		printf("%d bytes read (hex: %#x )\n", (uint32_t)lenTemp, (uint32_t)lenTemp);+
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		fclose(fp);+
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	}+
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+
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   	printf("\n");+
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	printf("%d bytes read (hex: %#x ) total \n", (uint32_t)lenTotal, (uint32_t)lenTotal);+
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+
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	time_t rawtime;+
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	time (&rawtime);+
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	struct tm *timeinfo;+
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	timeinfo = localtime(&rawtime);+
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	+
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//	sprintf(filenameout,"fwupdate_%s.bin",ctime(&rawtime));+
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	sprintf(filenameout,"OSTC4update_%02u%02u%02u.bin",timeinfo->tm_year-100,timeinfo->tm_mon+1,timeinfo->tm_mday);+
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+
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    fpout = fopen(filenameout, "wb");     +
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    for(int i = 0;i <lenTotal;i++)+
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    {+
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    	if(fwrite(&buf[i],1,1,fpout) != 1)+
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     	printf("error writing\n");+
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	}+
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	+
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	hw_ostc3_firmware_checksum(&buf2[0],&buf2[1],&buf2[2],&buf2[3],buf,lenTotal);+
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	printf("checksum  %#x %#x %#x %#x\n", buf2[0],buf2[1], buf2[2], buf2[3]);+
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   	if(fwrite(&buf2[0],1,4,fpout) != 4)+
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    	printf("error writing checksum\n");+
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    ;+
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	fclose(fpout);+
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}+
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