Mercurial > public > ostc4
view ostc4pack/src/checksum_final_add_fletcher.cpp @ 198:878dc9e0dbc5 div-fixes-cleaup-2
cleanup: another cleanup session (data_exchange_main.c)
Cleanup all kinds of stuff in one of the core functions. Made local
data static, with 1 already existing exception (the dataIn data). For
this, a trivial change is made in t7.c. In addition, not used code, and
commented out code that seems highly obsolete is removed. Another tiny
step in code that is better to maintain in the future.
Signed-off-by: Jan Mulder <jlmulder@xs4all.nl>
author | Jan Mulder <jlmulder@xs4all.nl> |
---|---|
date | Thu, 21 Mar 2019 15:28:47 +0100 |
parents | 1e707b34667e |
children | 01f40cb1057e |
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line source
#include <iostream> #include <stdlib.h> #include <stdio.h> #include <string.h> #include <time.h> void fletcher16(unsigned char *result1, unsigned char *result2, unsigned char const *data, size_t bytes ) { unsigned short sum1 = 0xff, sum2 = 0xff; size_t tlen; while (bytes) { tlen = bytes >= 20 ? 20 : bytes; bytes -= tlen; do { sum2 += sum1 += *data++; } while (--tlen); sum1 = (sum1 & 0xff) + (sum1 >> 8); sum2 = (sum2 & 0xff) + (sum2 >> 8); } /* Second reduction step to reduce sums to 8 bits */ sum1 = (sum1 & 0xff) + (sum1 >> 8); sum2 = (sum2 & 0xff) + (sum2 >> 8); *result2 = (sum2 & 0xff); *result1 = (sum1 & 0xff); // return sum2 << 8 | sum1; } // This is a variant of fletcher16 with a 16 bit sum instead of an 8 bit sum, // and modulo 2^16 instead of 2^16-1 void hw_ostc3_firmware_checksum (unsigned char *result1, unsigned char *result2, unsigned char *result3, unsigned char *result4, unsigned char const *data, size_t bytes ) { unsigned short low = 0; unsigned short high = 0; for (unsigned int i = 0; i < bytes; i++) { low += data[i]; high += low; } *result1 = (low & 0xff); *result2 = (low/256 & 0xff); *result3 = (unsigned char)(high & 0xff); *result4 = (unsigned char)((high/256) & 0xff); // return (((unsigned int)high) << 16) + low; } int main(int argc, char** argv) { FILE *fp, * fpout; size_t lenTotal,lenTemp; unsigned char buf[2000000]; char *file = argv[1]; char *file2 = argv[2]; char *file3 = argv[3]; unsigned int pruefsumme; unsigned char buf2[4]; printf("1: %s\n", file); printf("2: %s\n", file2); printf("3: %s\n", file3); printf("\n"); //write File with length and cheksum char filename[500], filenameout[510] ; sprintf(filename,"%s",file); int filelength = strlen(filename); filename[filelength -4] = 0; lenTotal = 0; if (NULL == (fp = fopen(file, "rb"))) { printf("Unable to open %s for reading\n", file); return -1; } lenTemp = fread(&buf[lenTotal], sizeof(char), sizeof(buf), fp); // lenTemp = fread(buf, sizeof(char), sizeof(buf), fp); lenTotal = lenTemp; printf("%d bytes read (hex: %#x )\n", lenTemp,lenTemp); fclose(fp); if(file2) { if (NULL == (fp = fopen(file2, "rb"))) { printf("Unable to open %s for reading\n", file2); return -1; } lenTemp = fread(&buf[lenTotal], sizeof(char), sizeof(buf)-lenTotal, fp); lenTotal += lenTemp; printf("%d bytes read (hex: %#x )\n", lenTemp,lenTemp); fclose(fp); } if(file3) { if (NULL == (fp = fopen(file3, "rb"))) { printf("Unable to open %s for reading\n", file3); return -1; } lenTemp = fread(&buf[lenTotal], sizeof(char), sizeof(buf)-lenTotal, fp); lenTotal += lenTemp; printf("%d bytes read (hex: %#x )\n", lenTemp,lenTemp); fclose(fp); } printf("\n"); printf("%d bytes read (hex: %#x ) total \n", lenTotal,lenTotal); time_t rawtime; time (&rawtime); struct tm *timeinfo; timeinfo = localtime(&rawtime); // sprintf(filenameout,"fwupdate_%s.bin",ctime(&rawtime)); sprintf(filenameout,"OSTC4update_%02u%02u%02u.bin",timeinfo->tm_year-100,timeinfo->tm_mon+1,timeinfo->tm_mday); fpout = fopen(filenameout, "wb"); for(int i = 0;i <lenTotal;i++) { if(fwrite(&buf[i],1,1,fpout) != 1) printf("error writing\n"); } hw_ostc3_firmware_checksum(&buf2[0],&buf2[1],&buf2[2],&buf2[3],buf,lenTotal); printf("checksum %#x %#x %#x %#x\n", buf2[0],buf2[1], buf2[2], buf2[3]); if(fwrite(&buf2[0],1,4,fpout) != 4) printf("error writing checksum\n"); ; fclose(fpout); }