CHG: `lf em` - added @marshmellow42 's changes

[proxmark3-svn] / client / reveng / poly.c

diff --git a/client/reveng/poly.c b/client/reveng/poly.c
index 0d41e5029448c147238ac74d97a5584a8efa404f..ed3118315033c10cdb3dfeff39e9dd50b6533a5f 100644 (file)
--- a/client/reveng/poly.c
+++ b/client/reveng/poly.c
@@ -1,9 +1,9 @@
 /* poly.c
- * Greg Cook, 29/Jul/2015
+ * Greg Cook, 26/Jul/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.
  *
@@ -18,10 +18,11 @@
  * 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/>.
  */
 
-/* 2015-07-29: discard leading $, &, 0x from argument to strtop()
+/* 2016-06-27: pcmp() shortcut returns 0 when pointers identical
+ * 2015-07-29: discard leading $, &, 0x from argument to strtop()
  * 2015-04-03: added direct mode to strtop()
  * 2014-01-11: added LOFS(), RNDUP()
  * 2013-09-16: SIZE(), IDX(), OFS() macros bitshift if BMP_POF2
@@ -140,7 +141,7 @@ filtop(FILE *input, unsigned long length, int flags, int bperhx) {
        bmp_t accu = BMP_C(0);
        bmp_t mask = bperhx == BMP_BIT ? ~BMP_C(0) : (BMP_C(1) << bperhx) - BMP_C(1);
        unsigned long iter = 0UL, idx;
-       int cmask = ~(~0 << CHAR_BIT), c;
+       int cmask = (1 << CHAR_BIT) - 1, c;
        int count = 0, ofs;
        poly_t poly = PZERO;
        if(bperhx == 0) return(poly);
@@ -205,7 +206,7 @@ strtop(const char *string, int flags, int bperhx) {
        bmp_t accu;
        bmp_t mask = bperhx == BMP_BIT ? ~BMP_C(0) : (BMP_C(1) << bperhx) - BMP_C(1);
        int pass, count, ofs;
-       int cmask = ~(~0 << CHAR_BIT), c;
+       int cmask = (1 << CHAR_BIT) - 1 , c;
        const char *s;
 
        poly_t poly = PZERO;
@@ -511,6 +512,8 @@ pcmp(const poly_t *a, const poly_t *b) {
        if(a->length > b->length) return(1);
        aptr = a->bitmap;
        bptr = b->bitmap;
+       if(aptr == bptr)
+               return(0);
        for(iter=0UL; iter < a->length; iter += BMP_BIT) {
                if(*aptr < *bptr)
                        return(-1);