113 lines
4.0 KiB
C
113 lines
4.0 KiB
C
/* *
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* Copyright (c) 2014, James S. Plank and Kevin Greenan
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* All rights reserved.
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*
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* Jerasure - A C/C++ Library for a Variety of Reed-Solomon and RAID-6 Erasure
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* Coding Techniques
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*
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* Revision 2.0: Galois Field backend now links to GF-Complete
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* - Neither the name of the University of Tennessee nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
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* WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/* Jerasure's authors:
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Revision 2.x - 2014: James S. Plank and Kevin M. Greenan
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Revision 1.2 - 2008: James S. Plank, Scott Simmerman and Catherine D. Schuman.
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Revision 1.0 - 2007: James S. Plank
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include "cauchy.h"
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#include "jerasure.h"
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#include "reed_sol.h"
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#define talloc(type, num) (type *) malloc(sizeof(type)*(num))
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static void usage(char *s)
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{
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fprintf(stderr, "usage: cauchy_01 n w - Converts the value n to a bitmatrix using GF(2^w).\n");
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fprintf(stderr, " \n");
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fprintf(stderr, " It prints the bitmatrix, and reports on the numberof ones.\n");
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fprintf(stderr, " Use 0x to input n in hexadecimal.\n");
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fprintf(stderr, " W must be <= 32.\n");
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fprintf(stderr, " \n");
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fprintf(stderr, "This demonstrates: cauchy_n_ones()\n");
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fprintf(stderr, " jerasure_matrix_to_bitmatrix()\n");
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fprintf(stderr, " jerasure_print_bitmatrix()\n");
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if (s != NULL) fprintf(stderr, "\n%s\n", s);
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exit(1);
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}
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int main(int argc, char **argv)
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{
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int n;
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int i, no, w;
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int *bitmatrix;
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if (argc != 3) usage(NULL);
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if (sscanf(argv[1], "0x%x", &n) == 0) {
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if (sscanf(argv[1], "%d", &n) == 0) usage("Bad n");
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}
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if (sscanf(argv[2], "%d", &w) == 0 || w <= 0 || w > 32) usage("Bad w");
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if (w == 31) {
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if (n & 0x80000000L) usage("Bad n/w combination (n not between 0 and 2^w-1)\n");
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} else if (w < 31) {
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if (n >= (1 << w)) usage("Bad n/w combination (n not between 0 and 2^w-1)\n");
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}
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bitmatrix = jerasure_matrix_to_bitmatrix(1, 1, w, &n);
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printf("<HTML><title>cauchy_01 %u %d</title>\n", w, n);
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printf("<HTML><h3>cauchy_01 %u %d</h3>\n", w, n);
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printf("<pre>\n");
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if (w == 32) {
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printf("Converted the value 0x%x to the following bitmatrix:\n\n", n);
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} else {
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printf("Converted the value %d (0x%x) to the following bitmatrix:\n\n", n, n);
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}
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jerasure_print_bitmatrix(bitmatrix, w, w, w);
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printf("\n");
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no = 0;
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for (i = 0; i < w*w; i++) no += bitmatrix[i];
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if (no != cauchy_n_ones(n, w)) {
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fprintf(stderr, "Jerasure error: # ones in the bitmatrix (%d) doesn't match cauchy_n_ones() (%d).\n",
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no, cauchy_n_ones(n, w));
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exit(1);
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}
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printf("# Ones: %d\n", cauchy_n_ones(n, w));
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return 0;
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}
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