/* cli.c
- * Greg Cook, 9/Apr/2015
+ * Greg Cook, 27/Jun/2016
*/
-/* CRC RevEng, an arbitrary-precision CRC calculator and algorithm finder
- * Copyright (C) 2010, 2011, 2012, 2013, 2014, 2015 Gregory Cook
+/* CRC RevEng: arbitrary-precision CRC calculator and algorithm finder
+ * Copyright (C) 2010, 2011, 2012, 2013, 2014, 2015, 2016 Gregory Cook
*
* This file is part of CRC RevEng.
*
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
- * along with CRC RevEng. If not, see <http://www.gnu.org/licenses/>.
+ * along with CRC RevEng. If not, see <https://www.gnu.org/licenses/>.
*/
-/* 2015-04-03: added -z
+/* 2016-06-27: -P sets width like -k
+ * 2015-04-03: added -z
* 2013-09-16: do not search with -M
* 2013-06-11: uprog() suppresses first progress report
* 2013-04-22: uprog() prints poly same as mtostr()
case 'i': /* i: Init value */
pptr = &model.init;
rflags |= R_HAVEI;
- goto ippx;
+ goto ipqx;
+ case 'P': /* P: reversed polynomial */
case 'k': /* k: polynomial in Koopman notation */
pfree(&model.spoly);
model.spoly = strtop(optarg, 0, 4);
pkchop(&model.spoly);
width = plen(model.spoly);
rflags |= R_HAVEP;
+ if(c == 'P')
+ prcp(&model.spoly);
mnovel(&model);
break;
case 'l': /* l little-endian input and output */
return 0;
//exit(EXIT_FAILURE);
}
- if(c < 0)
+ if(c < 0){
uerror("no preset models available");
+ return 0;
+ }
/* must set width so that parameter to -ipx is not zeroed */
width = plen(model.spoly);
rflags |= R_HAVEP | R_HAVEI | R_HAVERI | R_HAVERO | R_HAVEX;
case 'M': /* M non-augmenting algorithm */
model.flags &= ~P_MULXN;
break;
- case 'P': /* P: reversed polynomial */
case 'p': /* p: polynomial */
pptr = &model.spoly;
rflags &= ~R_HAVEQ;
rflags |= R_HAVEP;
-ippx:
+ipqx:
pfree(pptr);
*pptr = strtop(optarg, 0, 4);
pright(pptr, width);
- if(c == 'P')
- prev(pptr);
mnovel(&model);
break;
case 'q': /* q: range end polynomial */
pptr = &qpoly;
rflags &= ~R_HAVEP;
rflags |= R_HAVEQ;
- goto ippx;
+ goto ipqx;
case 'S': /* s space between output characters */
model.flags |= P_SPACE;
break;
mrev(&model);
break;
case 'w': /* w: CRC width = order - 1 */
+ /* no validation, WONTFIX */
width = (unsigned long) atol(optarg);
break;
case 'X': /* X print uppercase hex */
case 'x': /* x: XorOut value */
pptr = &model.xorout;
rflags |= R_HAVEX;
- goto ippx;
+ goto ipqx;
case 'y': /* y little-endian byte order in files */
model.flags |= P_LTLBYT;
break;
break;
case 'D': /* D dump all models */
args = mcount();
- if(!args)
+ if(!args){
uerror("no preset models available");
+ return 0;
+ }
for(mode = 0; mode < args; ++mode) {
mbynum(&model, mode);
mcanon(&model);
* either attaching names to arbitrary models or forcing to a preset
* mmatch(&model, M_OVERWR);
*/
- if(~model.flags & P_MULXN)
+ if(~model.flags & P_MULXN){
uerror("not a Williams model compliant algorithm");
+ return 0;
+ }
string = mtostr(&model);
puts(string);
free(string);
}
break;
case 's': /* s search for algorithm */
- if(!width)
+ if(!width){
uerror("must specify positive -k or -w before -s");
- if(~model.flags & P_MULXN)
+ return 0;
+ }
+ if(~model.flags & P_MULXN){
uerror("cannot search for non-Williams compliant models");
+ return 0;
+ }
praloc(&model.spoly, width);
praloc(&model.init, width);
praloc(&model.xorout, width);
/* allocate argument array */
args = argc - optind;
- if(!(apolys = malloc(args * sizeof(poly_t))))
+ if(!(apolys = malloc(args * sizeof(poly_t)))){
uerror("cannot allocate memory for argument list");
+ return 0;
+ }
for(pptr = apolys; optind < argc; ++optind) {
if(uflags & C_INFILE)
return 1;
//exit(EXIT_SUCCESS);
}
- if(!(model.flags & P_REFIN) != !(model.flags & P_REFOUT))
+ if(!(model.flags & P_REFIN) != !(model.flags & P_REFOUT)){
uerror("cannot search for crossed-endian models");
+ return 0;
+ }
pass = 0;
do {
mptr = candmods = reveng(&model, qpoly, rflags, args, apolys);
break;
default: /* no mode specified */
fprintf(stderr, "%s: no mode switch specified. Use %s -h for help.\n", myname, myname);
- return 0;
//exit(EXIT_FAILURE);
}
usage(void) {
/* print usage if asked, or if syntax incorrect */
fprintf(stderr,
- "CRC RevEng, an arbitrary-precision CRC calculator and algorithm finder\n"
+ "CRC RevEng: arbitrary-precision CRC calculator and algorithm finder\n"
"Usage:\t");
fputs(myname, stderr);
fprintf(stderr,
"\t-k KPOLY\tgenerator in Koopman notation (implies WIDTH)\n"
"\t-m MODEL\tpreset CRC algorithm\n"
"\t-p POLY\t\tgenerator or search range start polynomial\n"
- "\t-P RPOLY\treversed generator polynomial\n",
+ "\t-P RPOLY\treversed generator polynomial (implies WIDTH)\n",
BMP_BIT, BMP_BIT);
fprintf(stderr,
"\t-q QPOLY\tsearch range end polynomial\n"
"\t-c calculate CRCs\t\t-d dump algorithm parameters\n"
"\t-D list preset algorithms\t-e echo (and reformat) input\n"
"\t-s search for algorithm\t\t-v calculate reversed CRCs\n"
- "\t-h | -u | -? show this help\n"
+ "\t-g search for alg given hex+crc\t-h | -u | -? show this help\n"
+ "Common Use Examples:\n"
+ "\t reveng -g 01020304e3\n"
+ "\t Searches for a known/common crc preset that computes the crc\n"
+ "\t on the end of the given hex string\n"
+ "\t reveng -w 8 -s 01020304e3 010204039d\n"
+ "\t Searches for any possible 8 bit width crc calc that computes\n"
+ "\t the crc on the end of the given hex string(s)\n"
+ "\t reveng -m CRC-8 -c 01020304\n"
+ "\t Calculates the crc-8 of the given hex string\n"
+ "\t reveng -D\n"
+ "\t Outputs a list of all known/common crc models with their\n"
+ "\t preset values\n"
"\n"
- "Copyright (C) 2010, 2011, 2012, 2013, 2014, 2015 Gregory Cook\n"
+ "Copyright (C) 2010, 2011, 2012, 2013, 2014, 2015, 2016 Gregory Cook\n"
"This is free software; see the source for copying conditions. There is NO\n"
"warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
"Version "
projects / proxmark3-svn / blobdiff