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comparison ostc4pack/src/checksum_final_add_fletcher.cpp @ 49:1e707b34667e

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add o4pack files
author heinrichsweikamp
date Mon, 30 Jul 2018 11:31:20 +0200
parents
children 01f40cb1057e
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48:bf43851a678b 49:1e707b34667e
1 #include <iostream>
2 #include <stdlib.h>
3 #include <stdio.h>
4 #include <string.h>
5 #include <time.h>
6
7 void fletcher16(unsigned char *result1, unsigned char *result2, unsigned char const *data, size_t bytes )
8 {
9 unsigned short sum1 = 0xff, sum2 = 0xff;
10 size_t tlen;
11
12 while (bytes) {
13 tlen = bytes >= 20 ? 20 : bytes;
14 bytes -= tlen;
15 do {
16 sum2 += sum1 += *data++;
17 } while (--tlen);
18 sum1 = (sum1 & 0xff) + (sum1 >> 8);
19 sum2 = (sum2 & 0xff) + (sum2 >> 8);
20 }
21 /* Second reduction step to reduce sums to 8 bits */
22 sum1 = (sum1 & 0xff) + (sum1 >> 8);
23 sum2 = (sum2 & 0xff) + (sum2 >> 8);
24 *result2 = (sum2 & 0xff);
25 *result1 = (sum1 & 0xff);
26 // return sum2 << 8 | sum1;
27 }
28
29
30 // This is a variant of fletcher16 with a 16 bit sum instead of an 8 bit sum,
31 // and modulo 2^16 instead of 2^16-1
32 void
33 hw_ostc3_firmware_checksum (unsigned char *result1, unsigned char *result2, unsigned char *result3, unsigned char *result4, unsigned char const *data, size_t bytes )
34 {
35 unsigned short low = 0;
36 unsigned short high = 0;
37 for (unsigned int i = 0; i < bytes; i++) {
38 low += data[i];
39 high += low;
40 }
41 *result1 = (low & 0xff);
42 *result2 = (low/256 & 0xff);
43 *result3 = (unsigned char)(high & 0xff);
44 *result4 = (unsigned char)((high/256) & 0xff);
45 // return (((unsigned int)high) << 16) + low;
46 }
47
48
49 int main(int argc, char** argv) {
50
51
52 FILE *fp, * fpout;
53 size_t lenTotal,lenTemp;
54 unsigned char buf[2000000];
55 char *file = argv[1];
56 char *file2 = argv[2];
57 char *file3 = argv[3];
58 unsigned int pruefsumme;
59 unsigned char buf2[4];
60
61 printf("1: %s\n", file);
62 printf("2: %s\n", file2);
63 printf("3: %s\n", file3);
64 printf("\n");
65
66
67 //write File with length and cheksum
68 char filename[500], filenameout[510] ;
69 sprintf(filename,"%s",file);
70 int filelength = strlen(filename);
71 filename[filelength -4] = 0;
72
73 lenTotal = 0;
74 if (NULL == (fp = fopen(file, "rb")))
75 {
76 printf("Unable to open %s for reading\n", file);
77 return -1;
78 }
79 lenTemp = fread(&buf[lenTotal], sizeof(char), sizeof(buf), fp);
80 // lenTemp = fread(buf, sizeof(char), sizeof(buf), fp);
81 lenTotal = lenTemp;
82 printf("%d bytes read (hex: %#x )\n", lenTemp,lenTemp);
83 fclose(fp);
84
85 if(file2)
86 {
87 if (NULL == (fp = fopen(file2, "rb")))
88 {
89 printf("Unable to open %s for reading\n", file2);
90 return -1;
91 }
92 lenTemp = fread(&buf[lenTotal], sizeof(char), sizeof(buf)-lenTotal, fp);
93 lenTotal += lenTemp;
94 printf("%d bytes read (hex: %#x )\n", lenTemp,lenTemp);
95 fclose(fp);
96 }
97 if(file3)
98 {
99 if (NULL == (fp = fopen(file3, "rb")))
100 {
101 printf("Unable to open %s for reading\n", file3);
102 return -1;
103 }
104 lenTemp = fread(&buf[lenTotal], sizeof(char), sizeof(buf)-lenTotal, fp);
105 lenTotal += lenTemp;
106 printf("%d bytes read (hex: %#x )\n", lenTemp,lenTemp);
107 fclose(fp);
108 }
109
110 printf("\n");
111 printf("%d bytes read (hex: %#x ) total \n", lenTotal,lenTotal);
112
113 time_t rawtime;
114 time (&rawtime);
115 struct tm *timeinfo;
116 timeinfo = localtime(&rawtime);
117
118 // sprintf(filenameout,"fwupdate_%s.bin",ctime(&rawtime));
119 sprintf(filenameout,"OSTC4update_%02u%02u%02u.bin",timeinfo->tm_year-100,timeinfo->tm_mon+1,timeinfo->tm_mday);
120
121 fpout = fopen(filenameout, "wb");
122 for(int i = 0;i <lenTotal;i++)
123 {
124 if(fwrite(&buf[i],1,1,fpout) != 1)
125 printf("error writing\n");
126 }
127
128 hw_ostc3_firmware_checksum(&buf2[0],&buf2[1],&buf2[2],&buf2[3],buf,lenTotal);
129 printf("checksum %#x %#x %#x %#x\n", buf2[0],buf2[1], buf2[2], buf2[3]);
130 if(fwrite(&buf2[0],1,4,fpout) != 4)
131 printf("error writing checksum\n");
132 ;
133 fclose(fpout);
134 }