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https://github.com/RfidResearchGroup/proxmark3.git
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88 lines
2.5 KiB
C
88 lines
2.5 KiB
C
/* bmpbit.c
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* Greg Cook, 23/Feb/2019
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*/
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/* CRC RevEng: arbitrary-precision CRC calculator and algorithm finder
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* Copyright (C) 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018,
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* 2019 Gregory Cook
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*
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* This file is part of CRC RevEng.
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*
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* CRC RevEng 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 3 of the License, or
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* (at your option) any later version.
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*
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* CRC RevEng 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 CRC RevEng. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifdef BMPTST
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# include <stdio.h>
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# include <stdlib.h>
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#else
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# define FILE void
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#endif
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#include "reveng.h"
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#if (defined BMPTST) || (BMP_BIT < 32)
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/* Size in bits of a bmp_t. Not necessarily a power of two. */
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int bmpbit;
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/* The highest power of two that is strictly less than BMP_BIT.
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* Initialises the index of a binary search for set bits in a bmp_t.
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* (Computed correctly for BMP_BIT >= 2)
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*/
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int bmpsub;
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void
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setbmp(void) {
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/* Initialise BMP_BIT and BMP_SUB for the local architecture. */
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bmp_t bmpmax = ~(bmp_t) 0;
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bmpbit = 0;
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bmpsub = 1;
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while (bmpmax) {
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bmpmax <<= 1;
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++bmpbit;
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}
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while ((bmpsub | (bmpsub - 1)) < bmpbit - 1)
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bmpsub <<= 1;
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}
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#endif
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#ifdef BMPTST
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int
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main(int argc, char *argv[]) {
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/* check the compile-time bitmap width is correct, otherwise
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* searches run forever. */
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# if BMP_BIT > 0
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setbmp();
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if (BMP_BIT != bmpbit || BMP_SUB != bmpsub) {
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fprintf(stderr, "reveng: configuration fault. Update "
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"reveng/config.h with these definitions and "
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"recompile:\n"
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"\t#define BMP_BIT %d\n"
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"\t#define BMP_SUB %d\n",
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bmpbit, bmpsub);
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exit(EXIT_FAILURE);
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}
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# endif /* BMP_BIT > 0 */
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/* check the bitmap constant macro */
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if (~(bmp_t) 0 != ~BMP_C(0)) {
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fprintf(stderr, "reveng: configuration fault. Edit "
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"the definition of BMP_C() in config.h to "
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"match BMP_T and recompile.\n");
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exit(EXIT_FAILURE);
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}
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exit(EXIT_SUCCESS);
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}
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#endif /* BMPTST */
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