1/* Generate checksums of executables for PCH validation
2   Copyright (C) 2005
3   Free Software Foundation, Inc.
4
5This file is part of GCC.
6
7GCC is free software; you can redistribute it and/or modify it under
8the terms of the GNU General Public License as published by the Free
9Software Foundation; either version 2, or (at your option) any later
10version.
11
12GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13WARRANTY; without even the implied warranty of MERCHANTABILITY or
14FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
15for more details.
16
17You should have received a copy of the GNU General Public License
18along with GCC; see the file COPYING.  If not, write to the Free
19Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
2002110-1301, USA.  */
21
22#include "bconfig.h"
23#include "system.h"
24#include "md5.h"
25
26static void
27usage (void)
28{
29  fputs ("Usage: genchecksums <filename>\n", stderr);
30}
31
32static void
33dosum (const char *file)
34{
35  FILE *f;
36  unsigned char result[16];
37  int i;
38
39  f = fopen (file, "rb");
40  if (!f)
41    {
42      fprintf (stderr, "opening %s: %s\n", file, xstrerror (errno));
43      exit (1);
44    }
45
46  /* Some executable formats have timestamps in the first 16 bytes, yuck.  */
47  if (fseek (f, 16, SEEK_SET) != 0)
48     {
49      fprintf (stderr, "seeking in %s: %s\n", file, xstrerror (errno));
50      exit (1);
51    }
52
53  if (md5_stream (f, result) != 0
54      || fclose (f) != 0)
55     {
56      fprintf (stderr, "reading %s: %s\n", file, xstrerror (errno));
57      exit (1);
58    }
59
60  fputs ("const unsigned char executable_checksum[16] = { ", stdout);
61  for (i = 0; i < 16; i++)
62    printf ("%#02x%s", result[i], i == 15 ? " };\n" : ", ");
63}
64
65int
66main (int argc, char ** argv)
67{
68  if (argc != 2)
69    {
70      usage ();
71      return 1;
72    }
73
74  dosum (argv[1]);
75
76  return 0;
77}
78