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1 /* Generate checksums of executables for PCH validation
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2 Copyright (C) 2005, 2007
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3 Free Software Foundation, Inc.
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4
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5 This file is part of GCC.
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6
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7 GCC is free software; you can redistribute it and/or modify it under
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8 the terms of the GNU General Public License as published by the Free
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9 Software Foundation; either version 3, or (at your option) any later
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10 version.
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11
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12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with GCC; see the file COPYING3. If not see
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19 <http://www.gnu.org/licenses/>. */
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20
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21 #include "bconfig.h"
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22 #include "system.h"
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23 #include "md5.h"
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24
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25 static void
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26 usage (void)
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27 {
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28 fputs ("Usage: genchecksums <filename>\n", stderr);
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29 }
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30
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31 static void
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32 dosum (const char *file)
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33 {
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34 FILE *f;
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35 unsigned char result[16];
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36 int i;
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37
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38 f = fopen (file, "rb");
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39 if (!f)
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40 {
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41 fprintf (stderr, "opening %s: %s\n", file, xstrerror (errno));
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42 exit (1);
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43 }
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44
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45 /* Some executable formats have timestamps in the first 16 bytes, yuck. */
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46 if (fseek (f, 16, SEEK_SET) != 0)
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47 {
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48 fprintf (stderr, "seeking in %s: %s\n", file, xstrerror (errno));
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49 exit (1);
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50 }
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51
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52 if (md5_stream (f, result) != 0
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53 || fclose (f) != 0)
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54 {
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55 fprintf (stderr, "reading %s: %s\n", file, xstrerror (errno));
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56 exit (1);
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57 }
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58
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59 fputs ("const unsigned char executable_checksum[16] = { ", stdout);
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60 for (i = 0; i < 16; i++)
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61 printf ("%#02x%s", result[i], i == 15 ? " };\n" : ", ");
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62 }
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63
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64 int
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65 main (int argc, char ** argv)
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66 {
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67 if (argc != 2)
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68 {
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69 usage ();
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70 return 1;
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71 }
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72
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73 dosum (argv[1]);
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74
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75 return 0;
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76 }
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