/*
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/*
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* $Id: binpatch.c,v 1.2 2001-09-27 12:02:53 chris Exp $
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* $Id: binpatch.c,v 1.2 2001-09-27 12:02:53 chris Exp $
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*/
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*/
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#include <stdio.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdlib.h>
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/*
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/*
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* This function will patch binary file
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* This function will patch binary file
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*/
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*/
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static char buf[512];
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static char buf[512];
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static void
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static void
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usage(void)
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usage(void)
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{
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{
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printf("usage: binpatch [-h] <ofile> <ifile> <reloc> <off> <byte0> "
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printf("usage: binpatch [-h] <ofile> <ifile> <reloc> <off> <byte0> "
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"[<byte1> [<byte2> [<byte3>]]]\n");
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"[<byte1> [<byte2> [<byte3>]]]\n");
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printf("this function patches binary file at specified offset with\n");
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printf("this function patches binary file at specified offset with\n");
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printf("up to 4 bytes provided on command line \n");
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printf("up to 4 bytes provided on command line \n");
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printf("-h - prints this message\n\n");
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printf("-h - prints this message\n\n");
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printf("<ofile> - output file\n");
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printf("<ofile> - output file\n");
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printf("<ifile> - input ifile\n");
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printf("<ifile> - input ifile\n");
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printf("<reloc> - relocation address of image\n");
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printf("<reloc> - relocation address of image\n");
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printf("<off> - offset of patch, offset in file is at off - reloc\n");
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printf("<off> - offset of patch, offset in file is at off - reloc\n");
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printf("<byte0> - byte 0 of patch\n");
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printf("<byte0> - byte 0 of patch\n");
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printf("<byte1> - byte 1 of patch\n");
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printf("<byte1> - byte 1 of patch\n");
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printf("<byte2> - byte 1 of patch\n");
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printf("<byte2> - byte 1 of patch\n");
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printf("<byte3> - byte 1 of patch\n");
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printf("<byte3> - byte 1 of patch\n");
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return;
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return;
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}
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}
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int
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int
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main(int argc, char **argv)
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main(int argc, char **argv)
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{
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{
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int c;
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int c;
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FILE *ofp, *ifp;
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FILE *ofp, *ifp;
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char patch[4], *end;
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char patch[4], *end;
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int patchLen, tmp, i, off, cnt, patched, len, reloc;
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int patchLen, tmp, i, off, cnt, patched, len, reloc;
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/* parse command line options */
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/* parse command line options */
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while ((c = getopt(argc, argv, "h")) >= 0)
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while ((c = getopt(argc, argv, "h")) >= 0)
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{
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{
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switch (c)
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switch (c)
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{
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{
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case 'h':
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case 'h':
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usage();
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usage();
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return 0;
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return 0;
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default:
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default:
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usage();
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usage();
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return 1;
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return 1;
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}
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}
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}
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}
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if(argc < 6)
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if(argc < 6)
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{
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{
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usage();
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usage();
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return 1;
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return 1;
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}
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}
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/* Let us get offset in file */
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/* Let us get offset in file */
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reloc = strtol(argv[3], &end, 0);
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reloc = strtol(argv[3], &end, 0);
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if(end == argv[3] || off < 0)
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if(end == argv[3] || off < 0)
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{
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{
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fprintf(stderr, "bad reloc value %s\n", argv[3]);
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fprintf(stderr, "bad reloc value %s\n", argv[3]);
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return 1;
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return 1;
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}
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}
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off = strtol(argv[4], &end, 0);
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off = strtol(argv[4], &end, 0);
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if(end == argv[4] || off < 0 || off < reloc)
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if(end == argv[4] || off < 0 || off < reloc)
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{
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{
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fprintf(stderr, "bad offset value %s\n", argv[4]);
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fprintf(stderr, "bad offset value %s\n", argv[4]);
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return 1;
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return 1;
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}
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}
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off -= reloc;
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off -= reloc;
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/* Let us get patch */
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/* Let us get patch */
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patchLen = argc - 5;
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patchLen = argc - 5;
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for(i=0; i<patchLen; i++)
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for(i=0; i<patchLen; i++)
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{
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{
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tmp = strtol(argv[5+i], &end, 0);
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tmp = strtol(argv[5+i], &end, 0);
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if(end == argv[4+i] || tmp < 0 || tmp > 0xff)
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if(end == argv[4+i] || tmp < 0 || tmp > 0xff)
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{
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{
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fprintf(stderr, "bad byte value %s\n", argv[5+i]);
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fprintf(stderr, "bad byte value %s\n", argv[5+i]);
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return 1;
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return 1;
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}
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}
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patch[i] = tmp;
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patch[i] = tmp;
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}
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}
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ifp = fopen(argv[2], "r");
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ifp = fopen(argv[2], "r");
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if(ifp == NULL)
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if(ifp == NULL)
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{
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{
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fprintf(stderr, "unable to open file %s\n", argv[2]);
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fprintf(stderr, "unable to open file %s\n", argv[2]);
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return 1;
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return 1;
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}
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}
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ofp = fopen(argv[1], "w");
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ofp = fopen(argv[1], "w");
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if(ofp == NULL)
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if(ofp == NULL)
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{
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{
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fprintf(stderr, "unable to open file %s\n", argv[1]);
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fprintf(stderr, "unable to open file %s\n", argv[1]);
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return 1;
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return 1;
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}
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}
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cnt = 0;
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cnt = 0;
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patched = 0;
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patched = 0;
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for(;;)
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for(;;)
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{
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{
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len = fread(buf, 1, sizeof(buf), ifp);
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len = fread(buf, 1, sizeof(buf), ifp);
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if(len == 0)
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if(len == 0)
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{
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{
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break;
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break;
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}
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}
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if(cnt <= off && (cnt + len) > off)
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if(cnt <= off && (cnt + len) > off)
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{
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{
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/* Perform patch */
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/* Perform patch */
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for(i=0; i<patchLen && (off+i)<(cnt+len); i++)
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for(i=0; i<patchLen && (off+i)<(cnt+len); i++)
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{
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{
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buf[off-cnt+i] = patch[i];
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buf[off-cnt+i] = patch[i];
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}
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}
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patched = 1;
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patched = 1;
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}
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}
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else if(cnt > off && cnt < (off + patchLen))
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else if(cnt > off && cnt < (off + patchLen))
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{
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{
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/* Perform patch */
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/* Perform patch */
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for(i=cnt-off; i<patchLen; i++)
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for(i=cnt-off; i<patchLen; i++)
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{
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{
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buf[off-cnt+i] = patch[i];
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buf[off-cnt+i] = patch[i];
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}
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}
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patched = 1;
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patched = 1;
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}
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}
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fwrite(buf, 1, len, ofp);
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fwrite(buf, 1, len, ofp);
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cnt += len;
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cnt += len;
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}
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}
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fclose(ifp);
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fclose(ifp);
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fclose(ofp);
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fclose(ofp);
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if(!patched)
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if(!patched)
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{
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{
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fprintf(stderr, "warning: offset is beyond input file length\n");
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fprintf(stderr, "warning: offset is beyond input file length\n");
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fprintf(stderr, " no patch is performed\n");
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fprintf(stderr, " no patch is performed\n");
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}
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}
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return 0;
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return 0;
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}
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}
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