164 lines
3.9 KiB
C
164 lines
3.9 KiB
C
/***************************************************************************
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* binoffset.c
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* (C) 2002 Randy Dunlap <rddunlap@osdl.org>
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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# binoffset.c:
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# - searches a (binary) file for a specified (binary) pattern
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# - returns the offset of the located pattern or ~0 if not found
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# - exits with exit status 0 normally or non-0 if pattern is not found
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# or any other error occurs.
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****************************************************************/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#define VERSION "0.1"
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#define BUF_SIZE (16 * 1024)
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#define PAT_SIZE 100
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char *progname;
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char *inputname;
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int inputfd;
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unsigned int bix; /* buf index */
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unsigned char patterns [PAT_SIZE] = {0}; /* byte-sized pattern array */
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int pat_len; /* actual number of pattern bytes */
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unsigned char *madr; /* mmap address */
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size_t filesize;
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int num_matches = 0;
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off_t firstloc = 0;
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void usage (void)
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{
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fprintf (stderr, "%s ver. %s\n", progname, VERSION);
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fprintf (stderr, "usage: %s filename pattern_bytes\n",
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progname);
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fprintf (stderr, " [prints location of pattern_bytes in file]\n");
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exit (1);
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}
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void get_pattern (int pat_count, char *pats [])
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{
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int ix, err, tmp;
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#ifdef DEBUG
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fprintf (stderr,"get_pattern: count = %d\n", pat_count);
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for (ix = 0; ix < pat_count; ix++)
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fprintf (stderr, " pat # %d: [%s]\n", ix, pats[ix]);
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#endif
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for (ix = 0; ix < pat_count; ix++) {
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tmp = 0;
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err = sscanf (pats[ix], "%5i", &tmp);
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if (err != 1 || tmp > 0xff) {
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fprintf (stderr, "pattern or value error in pattern # %d [%s]\n",
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ix, pats[ix]);
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usage ();
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}
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patterns [ix] = tmp;
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}
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pat_len = pat_count;
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}
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void search_pattern (void)
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{
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for (bix = 0; bix < filesize; bix++) {
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if (madr[bix] == patterns[0]) {
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if (memcmp (&madr[bix], patterns, pat_len) == 0) {
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if (num_matches == 0)
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firstloc = bix;
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num_matches++;
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}
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}
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}
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}
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#ifdef NOTDEF
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size_t get_filesize (int fd)
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{
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off_t end_off = lseek (fd, 0, SEEK_END);
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lseek (fd, 0, SEEK_SET);
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return (size_t) end_off;
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}
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#endif
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size_t get_filesize (int fd)
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{
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int err;
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struct stat stat;
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err = fstat (fd, &stat);
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fprintf (stderr, "filesize: %ld\n", err < 0 ? (long)err : stat.st_size);
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if (err < 0)
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return err;
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return (size_t) stat.st_size;
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}
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int main (int argc, char *argv [])
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{
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progname = argv[0];
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if (argc < 3)
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usage ();
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get_pattern (argc - 2, argv + 2);
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inputname = argv[1];
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inputfd = open (inputname, O_RDONLY);
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if (inputfd == -1) {
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fprintf (stderr, "%s: cannot open '%s'\n",
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progname, inputname);
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exit (3);
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}
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filesize = get_filesize (inputfd);
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madr = mmap (0, filesize, PROT_READ, MAP_PRIVATE, inputfd, 0);
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if (madr == MAP_FAILED) {
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fprintf (stderr, "mmap error = %d\n", errno);
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close (inputfd);
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exit (4);
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}
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search_pattern ();
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if (munmap (madr, filesize))
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fprintf (stderr, "munmap error = %d\n", errno);
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if (close (inputfd))
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fprintf (stderr, "%s: error %d closing '%s'\n",
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progname, errno, inputname);
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fprintf (stderr, "number of pattern matches = %d\n", num_matches);
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if (num_matches == 0)
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firstloc = ~0;
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printf ("%ld\n", firstloc);
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fprintf (stderr, "%ld\n", firstloc);
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exit (num_matches ? 0 : 2);
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}
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/* end binoffset.c */
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