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comparison miscprog/factdiff.c @ 129:597143ba1c37

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miscellaneous C programs moved out of the top level directory
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Sun, 06 Apr 2014 20:20:39 +0000
parents factdiff.c@00dedefbdfd1
children
comparison
equal deleted inserted replaced
128:03f8a618689e 129:597143ba1c37
1 /*
2 * The 64 KiB "factory block" at the end of the 2nd flash chip select on
3 * Pirelli DP-L10 phones is believed to contain juicy info (IMEI and RF
4 * calibration data), but the format is yet to be cracked.
5 *
6 * This program compares Pirelli factory block images that have been read
7 * out of several phones, seeking to determine which bytes are always the
8 * same and which bytes change from specimen to specimen.
9 *
10 * Written by Spacefalcon the Outlaw.
11 */
12
13 #include <sys/types.h>
14 #include <sys/file.h>
15 #include <stdio.h>
16 #include <stdlib.h>
17
18 u_char specimen0[65536];
19 char is_diff[65536];
20
21 read_specimen_file(filename, buf)
22 char *filename;
23 u_char *buf;
24 {
25 int fd, cc;
26
27 fd = open(filename, O_RDONLY);
28 if (fd < 0) {
29 perror(filename);
30 exit(1);
31 }
32 cc = read(fd, buf, 65536);
33 close(fd);
34 if (cc != 65536) {
35 fprintf(stderr, "%s: unable to read 64 KiB\n", filename);
36 exit(1);
37 }
38 }
39
40 process_comp_specimen(filename)
41 char *filename;
42 {
43 u_char this_spec[65536];
44 int i;
45
46 read_specimen_file(filename, this_spec);
47 for (i = 0; i < 65536; i++)
48 if (this_spec[i] != specimen0[i])
49 is_diff[i] = 1;
50 }
51
52 output()
53 {
54 int off, state, cstart, num;
55
56 for (off = 0; off < 65536; ) {
57 state = is_diff[off];
58 cstart = off;
59 while (off < 65536 && is_diff[off] == state)
60 off++;
61 printf("%04X-%04X: %s", cstart, off-1,
62 state ? "varying" : "constant");
63 if (state) {
64 num = off - cstart;
65 printf(" (%d byte%s)", num, num != 1 ? "s" : "");
66 }
67 putchar('\n');
68 }
69 }
70
71 main(argc, argv)
72 char **argv;
73 {
74 char **ap;
75
76 if (argc < 3) {
77 fprintf(stderr, "usage: %s specimen0 specimen1 ...\n", argv[0]);
78 exit(1);
79 }
80 read_specimen_file(argv[1], specimen0);
81 for (ap = argv + 2; *ap; ap++)
82 process_comp_specimen(*ap);
83 output();
84 exit(0);
85 }