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/*
* $Id$
*/
#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;
}
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