add reveng-1.30

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

diff --git a/client/reveng/bmpbit.c b/client/reveng/bmpbit.c
new file mode 100644 (file)
index 0000000..39a29e6
--- /dev/null
+++ b/client/reveng/bmpbit.c
@@ -0,0 +1,86 @@
+/* bmpbit.c
+ * Greg Cook, 9/Apr/2015
+ */
+
+/* CRC RevEng, an arbitrary-precision CRC calculator and algorithm finder
+ * Copyright (C) 2010, 2011, 2012, 2013, 2014, 2015  Gregory Cook
+ *
+ * This file is part of CRC RevEng.
+ *
+ * CRC RevEng is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * CRC RevEng is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * 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/>.
+ */
+
+#ifdef BMPTST
+#  include <stdio.h>
+#  include <stdlib.h>
+#else
+#  define FILE void
+#endif
+#include "reveng.h"
+
+#if (defined BMPTST) || (BMP_BIT < 32)
+/* Size in bits of a bmp_t.  Not necessarily a power of two. */
+int bmpbit;
+
+/* The highest power of two that is strictly less than BMP_BIT.
+ * Initialises the index of a binary search for set bits in a bmp_t.
+ * (Computed correctly for BMP_BIT >= 2)
+ */
+int bmpsub;
+
+void
+setbmp(void) {
+       /* Initialise BMP_BIT and BMP_SUB for the local architecture. */
+       bmp_t bmpmax = ~(bmp_t) 0;
+
+       bmpbit = 0; bmpsub = 1;
+
+       while(bmpmax) {
+               bmpmax <<= 1;
+               ++bmpbit;
+       }
+
+       while((bmpsub | (bmpsub - 1)) < bmpbit - 1)
+               bmpsub <<= 1;
+}
+#endif
+
+#ifdef BMPTST
+int
+main(int argc, char *argv[]) {
+       /* check the compile-time bitmap width is correct, otherwise
+        * searches run forever. */
+#  if BMP_BIT > 0
+       setbmp();
+       if(BMP_BIT != bmpbit || BMP_SUB != bmpsub) {
+               fprintf(stderr,"reveng: configuration fault.  Update "
+                       "config.h with these definitions and "
+                       "recompile:\n"
+                       "\t#define BMP_BIT   %d\n"
+                       "\t#define BMP_SUB   %d\n",
+                       bmpbit, bmpsub);
+               exit(EXIT_FAILURE);
+       }
+#  endif /* BMP_BIT > 0 */
+       /* check the bitmap constant macro */
+       if(~(bmp_t) 0 != ~BMP_C(0)) {
+               fprintf(stderr, "reveng: configuration fault.  Edit "
+                       "the definition of BMP_C() in config.h to "
+                       "match BMP_T and recompile.\n");
+               exit(EXIT_FAILURE);
+       }
+       exit(EXIT_SUCCESS);
+}
+
+#endif /* BMPTST */