FreeCalypso > hg > freecalypso-reveng

annotate miscprog/pircksum.c @ 227:bb86424f78e6

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current-draw: checking in experiment results
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 17 Dec 2017 19:30:22 +0000
parents bf4286245c74
children
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181
bf4286245c74 Pirelli's RF calibration cracked
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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1 /*
bf4286245c74 Pirelli's RF calibration cracked
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2 * This program has been used to verify and refine my understanding of the
bf4286245c74 Pirelli's RF calibration cracked
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3 * checksum scheme used for Pirelli's RF calibration data.
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4 */
bf4286245c74 Pirelli's RF calibration cracked
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5
bf4286245c74 Pirelli's RF calibration cracked
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6 #include <sys/types.h>
bf4286245c74 Pirelli's RF calibration cracked
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7 #include <stdio.h>
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8 #include <stdlib.h>
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9
bf4286245c74 Pirelli's RF calibration cracked
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10 main(argc, argv)
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11 char **argv;
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12 {
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13 FILE *f;
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14 u_long offset, len;
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15 u_char inb, accum;
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16
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17 if (argc != 4) {
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18 fprintf(stderr, "usage: %s fact.bin offset len\n", argv[0]);
bf4286245c74 Pirelli's RF calibration cracked
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19 exit(1);
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20 }
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21 f = fopen(argv[1], "r");
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22 if (!f) {
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23 perror(argv[1]);
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24 exit(1);
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25 }
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26 offset = strtoul(argv[2], 0, 16);
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27 len = strtoul(argv[3], 0, 16);
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28 fseek(f, offset, SEEK_SET);
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29 for (accum = 0; len; len--) {
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30 inb = getc(f);
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31 accum += inb;
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32 }
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33 inb = getc(f);
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34 printf("Computed cksum %02X, following byte %02X\n", accum, inb);
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35 exit(0);
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36 }