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1/* bmpbit.c
2 * Greg Cook, 9/Apr/2015
3 */
4
5/* CRC RevEng, an arbitrary-precision CRC calculator and algorithm finder
6 * Copyright (C) 2010, 2011, 2012, 2013, 2014, 2015 Gregory Cook
7 *
8 * This file is part of CRC RevEng.
9 *
10 * CRC RevEng is free software: you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation, either version 3 of the License, or
13 * (at your option) any later version.
14 *
15 * CRC RevEng is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with CRC RevEng. If not, see <http://www.gnu.org/licenses/>.
22 */
23
24#ifdef BMPTST
25# include <stdio.h>
26# include <stdlib.h>
27#else
28# define FILE void
29#endif
30#include "reveng.h"
31
32#if (defined BMPTST) || (BMP_BIT < 32)
33/* Size in bits of a bmp_t. Not necessarily a power of two. */
34int bmpbit;
35
36/* The highest power of two that is strictly less than BMP_BIT.
37 * Initialises the index of a binary search for set bits in a bmp_t.
38 * (Computed correctly for BMP_BIT >= 2)
39 */
40int bmpsub;
41
42void
43setbmp(void) {
44 /* Initialise BMP_BIT and BMP_SUB for the local architecture. */
45 bmp_t bmpmax = ~(bmp_t) 0;
46
47 bmpbit = 0; bmpsub = 1;
48
49 while(bmpmax) {
50 bmpmax <<= 1;
51 ++bmpbit;
52 }
53
54 while((bmpsub | (bmpsub - 1)) < bmpbit - 1)
55 bmpsub <<= 1;
56}
57#endif
58
59#ifdef BMPTST
60int
61main(int argc, char *argv[]) {
62 /* check the compile-time bitmap width is correct, otherwise
63 * searches run forever. */
64# if BMP_BIT > 0
65 setbmp();
66 if(BMP_BIT != bmpbit || BMP_SUB != bmpsub) {
67 fprintf(stderr,"reveng: configuration fault. Update "
68 "config.h with these definitions and "
69 "recompile:\n"
70 "\t#define BMP_BIT %d\n"
71 "\t#define BMP_SUB %d\n",
72 bmpbit, bmpsub);
73 exit(EXIT_FAILURE);
74 }
75# endif /* BMP_BIT > 0 */
76 /* check the bitmap constant macro */
77 if(~(bmp_t) 0 != ~BMP_C(0)) {
78 fprintf(stderr, "reveng: configuration fault. Edit "
79 "the definition of BMP_C() in config.h to "
80 "match BMP_T and recompile.\n");
81 exit(EXIT_FAILURE);
82 }
83 exit(EXIT_SUCCESS);
84}
85
86#endif /* BMPTST */
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