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/*

 *  $Id: binpatch.c,v 1.2 2001-09-27 12:02:53 chris Exp $

 */

#include <stdio.h>

#include <stdlib.h>

/*

 * This function will patch binary file

 */

static char buf[512];

static void

usage(void)

{

  printf("usage: binpatch [-h] <ofile> <ifile> <reloc> <off> <byte0> "

         "[<byte1> [<byte2> [<byte3>]]]\n");

  printf("this function patches binary file at specified offset with\n");

  printf("up to 4 bytes provided on command line \n");

  printf("-h       - prints this message\n\n");

  printf("<ofile>  - output file\n");

  printf("<ifile>  - input ifile\n");

  printf("<reloc>  - relocation address of image\n");

  printf("<off>    - offset of patch, offset in file is at off - reloc\n");

  printf("<byte0>  - byte 0 of patch\n");

  printf("<byte1>  - byte 1 of patch\n");

  printf("<byte2>  - byte 1 of patch\n");

  printf("<byte3>  - byte 1 of patch\n");

  return;

}

int

main(int argc, char **argv)

{

  int   c;

  FILE  *ofp, *ifp;

  char  patch[4], *end;

  int   patchLen, tmp, i, off, cnt, patched, len, reloc;

  /* parse command line options */

  while ((c = getopt(argc, argv, "h")) >= 0)

    {

      switch (c)

        {

        case 'h':

          usage();

          return 0;

        default:

          usage();

          return 1;

        }

    }

  if(argc < 6)

    {

      usage();

      return 1;

    }

  /* Let us get offset in file */

  reloc = strtol(argv[3], &end, 0);

  if(end == argv[3] || off < 0)

    {

      fprintf(stderr, "bad reloc value %s\n", argv[3]);

      return 1;

    }

  off = strtol(argv[4], &end, 0);

  if(end == argv[4] || off < 0 || off < reloc)

    {

      fprintf(stderr, "bad offset value %s\n", argv[4]);

      return 1;

    }

  off -= reloc;

  /* Let us get patch  */

  patchLen = argc - 5;

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

    {

      tmp = strtol(argv[5+i], &end, 0);

      if(end == argv[4+i] || tmp < 0 || tmp > 0xff)

        {

          fprintf(stderr, "bad byte value %s\n", argv[5+i]);

          return 1;

        }

      patch[i] = tmp;

    }

  ifp = fopen(argv[2], "r");

  if(ifp == NULL)

    {

      fprintf(stderr, "unable to open file %s\n", argv[2]);

      return 1;

    }

  ofp = fopen(argv[1], "w");

  if(ofp == NULL)

    {

      fprintf(stderr, "unable to open file %s\n", argv[1]);

      return 1;

    }

  cnt     = 0;

  patched = 0;

  for(;;)

    {

      len = fread(buf, 1, sizeof(buf), ifp);

      if(len == 0)

        {

          break;

        }

      if(cnt <= off && (cnt + len) > off)

        {

          /* Perform patch */

          for(i=0; i<patchLen && (off+i)<(cnt+len); i++)

            {

              buf[off-cnt+i] = patch[i];

            }

          patched = 1;

        }

      else if(cnt > off && cnt < (off + patchLen))

        {

          /* Perform patch */

          for(i=cnt-off; i<patchLen; i++)

            {

              buf[off-cnt+i] = patch[i];

            }

          patched = 1;

        }

      fwrite(buf, 1, len, ofp);

      cnt += len;

    }

  fclose(ifp);

  fclose(ofp);

  if(!patched)

    {

      fprintf(stderr, "warning: offset is beyond input file length\n");

      fprintf(stderr, "         no patch is performed\n");

    }

  return 0;

}