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annotate miscprog/factdiff.c @ 175:928ed52930aa

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objgrep-fe: works after fixing a buglet
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Fri, 04 Jul 2014 16:37:51 +0000
parents 597143ba1c37
children
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1 /*
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2 * The 64 KiB "factory block" at the end of the 2nd flash chip select on
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3 * Pirelli DP-L10 phones is believed to contain juicy info (IMEI and RF
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4 * calibration data), but the format is yet to be cracked.
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5 *
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6 * This program compares Pirelli factory block images that have been read
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7 * out of several phones, seeking to determine which bytes are always the
103d996ed2d5 factdiff utility written
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8 * same and which bytes change from specimen to specimen.
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9 *
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10 * Written by Spacefalcon the Outlaw.
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11 */
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12
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13 #include <sys/types.h>
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14 #include <sys/file.h>
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15 #include <stdio.h>
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16 #include <stdlib.h>
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17
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18 u_char specimen0[65536];
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19 char is_diff[65536];
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20
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21 read_specimen_file(filename, buf)
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22 char *filename;
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23 u_char *buf;
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24 {
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25 int fd, cc;
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26
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27 fd = open(filename, O_RDONLY);
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28 if (fd < 0) {
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29 perror(filename);
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30 exit(1);
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31 }
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32 cc = read(fd, buf, 65536);
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33 close(fd);
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34 if (cc != 65536) {
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35 fprintf(stderr, "%s: unable to read 64 KiB\n", filename);
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36 exit(1);
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37 }
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38 }
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39
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40 process_comp_specimen(filename)
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41 char *filename;
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42 {
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43 u_char this_spec[65536];
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44 int i;
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45
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46 read_specimen_file(filename, this_spec);
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47 for (i = 0; i < 65536; i++)
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48 if (this_spec[i] != specimen0[i])
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49 is_diff[i] = 1;
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50 }
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51
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52 output()
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53 {
53
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54 int off, state, cstart, num;
52
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55
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56 for (off = 0; off < 65536; ) {
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57 state = is_diff[off];
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58 cstart = off;
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59 while (off < 65536 && is_diff[off] == state)
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60 off++;
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61 printf("%04X-%04X: %s", cstart, off-1,
52
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62 state ? "varying" : "constant");
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63 if (state) {
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64 num = off - cstart;
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65 printf(" (%d byte%s)", num, num != 1 ? "s" : "");
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66 }
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67 putchar('\n');
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68 }
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69 }
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70
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71 main(argc, argv)
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72 char **argv;
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73 {
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74 char **ap;
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75
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76 if (argc < 3) {
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77 fprintf(stderr, "usage: %s specimen0 specimen1 ...\n", argv[0]);
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78 exit(1);
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79 }
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80 read_specimen_file(argv[1], specimen0);
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81 for (ap = argv + 2; *ap; ap++)
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82 process_comp_specimen(*ap);
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83 output();
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84 exit(0);
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85 }