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/* Generate checksums of executables for PCH validation

   Copyright (C) 2005, 2007, 2009, 2010

   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);

}

/* Important: BLOCKSIZE must be a multiple of 64.  */

#define BLOCKSIZE 4096

static void

dosum (struct md5_ctx *ctx, const char *file)

{

  FILE *f;

  char buffer[BLOCKSIZE + 72];

  size_t sum;

  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);

    }

  /* Iterate over full file contents.  */

  while (1)

    {

      /* We read the file in blocks of BLOCKSIZE bytes.  One call of the

         computation function processes the whole buffer so that with the

         next round of the loop another block can be read.  */

      size_t n;

      sum = 0;

      /* Read block.  Take care for partial reads.  */

      do

        {

          n = fread (buffer + sum, 1, BLOCKSIZE - sum, f);

          sum += n;

        }

      while (sum < BLOCKSIZE && n != 0);

      if (n == 0 && ferror (f))

        exit (1);

      /* If end of file is reached, end the loop.  */

      if (n == 0)

        break;

      /* Process buffer with BLOCKSIZE bytes.  Note that

                        BLOCKSIZE % 64 == 0

       */

      md5_process_block (buffer, BLOCKSIZE, ctx);

    }

  /* Add the last bytes if necessary.  */

  if (sum > 0)

    md5_process_bytes (buffer, sum, ctx);

  if (fclose (f) != 0)

     {

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

      exit (1);

    }

}

int

main (int argc, char ** argv)

{

  struct md5_ctx ctx;

  unsigned char result[16];

  int i;

  if (argc < 2)

    {

      usage ();

      return 1;

    }

  md5_init_ctx (&ctx);

  for (i = 1; i < argc; i++)

    dosum (&ctx, argv[i]);

  md5_finish_ctx (&ctx, result);

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

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

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

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

    printf ("0x%02x%s", result[i], i == 15 ? " };\n" : ", ");

  return 0;

}