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/* Generate checksums of executables for PCH validation

   Copyright (C) 2005, 2007, 2009

   Free Software Foundation, Inc.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it under

the terms of the GNU General Public License as published by the Free

Software Foundation; either version 3, or (at your option) any later

version.

GCC is distributed in the hope that it will be useful, but WITHOUT ANY

WARRANTY; without even the implied warranty of MERCHANTABILITY or

FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

for more details.

You should have received a copy of the GNU General Public License

along with GCC; see the file COPYING3.  If not see

<http://www.gnu.org/licenses/>.  */

#include "bconfig.h"

#include "system.h"

#include "md5.h"

static void

usage (void)

{

  fputs ("Usage: genchecksums <filename>\n", stderr);

}

static void

dosum (const char *file)

{

  FILE *f;

  unsigned char result[16];

  int i;

  f = fopen (file, "rb");

  if (!f)

    {

      fprintf (stderr, "opening %s: %s\n", file, xstrerror (errno));

      exit (1);

    }

  /* Some executable formats have timestamps in the first 16 bytes, yuck.  */

  if (fseek (f, 16, SEEK_SET) != 0)

     {

      fprintf (stderr, "seeking in %s: %s\n", file, xstrerror (errno));

      exit (1);

    }

  if (md5_stream (f, result) != 0

      || fclose (f) != 0)

     {

      fprintf (stderr, "reading %s: %s\n", file, xstrerror (errno));

      exit (1);

    }

  puts ("#include \"config.h\"");

  puts ("#include \"system.h\"");

  fputs ("EXPORTED_CONST unsigned char executable_checksum[16] = { ", stdout);

  for (i = 0; i < 16; i++)

    printf ("%#02x%s", result[i], i == 15 ? " };\n" : ", ");

}

int

main (int argc, char ** argv)

{

  if (argc != 2)

    {

      usage ();

      return 1;

    }

  dosum (argv[1]);

  return 0;

}