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-/* *
- * Copyright (c) 2014, James S. Plank and Kevin Greenan
- * All rights reserved.
- *
- * Jerasure - A C/C++ Library for a Variety of Reed-Solomon and RAID-6 Erasure
- * Coding Techniques
- *
- * Revision 2.0: Galois Field backend now links to GF-Complete
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * - Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * - Neither the name of the University of Tennessee nor the names of its
- * contributors may be used to endorse or promote products derived
- * from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
- * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- */
-
-/* Jerasure's authors:
-
- Revision 2.x - 2014: James S. Plank and Kevin M. Greenan.
- Revision 1.2 - 2008: James S. Plank, Scott Simmerman and Catherine D. Schuman.
- Revision 1.0 - 2007: James S. Plank.
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include "jerasure.h"
-
-#define talloc(type, num) (type *) malloc(sizeof(type)*(num))
-
-static void usage(char *s)
-{
- fprintf(stderr, "usage: jerasure_04 k w - Performs the analogous bit-matrix operations to jerasure_03.\n\n");
- fprintf(stderr, " It converts the matrix to a kw*kw bit matrix and does the same operations.\n");
- fprintf(stderr, " k must be < 2^w.\n");
- fprintf(stderr, "This demonstrates: jerasure_print_bitmatrix()\n");
- fprintf(stderr, " jerasure_matrix_to_bitmatrix()\n");
- fprintf(stderr, " jerasure_invertible_bitmatrix()\n");
- fprintf(stderr, " jerasure_invert_bitmatrix()\n");
- fprintf(stderr, " jerasure_matrix_multiply().\n");
- if (s != NULL) fprintf(stderr, "%s\n", s);
- exit(1);
-}
-
-int main(int argc, char **argv)
-{
- unsigned int k, w, i, j, n;
- int *matrix;
- int *bitmatrix;
- int *bitmatrix_copy;
- int *inverse;
- int *identity;
-
- if (argc != 3) usage(NULL);
- if (sscanf(argv[1], "%d", &k) == 0 || k <= 0) usage("Bad k");
- if (sscanf(argv[2], "%d", &w) == 0 || w <= 0 || w > 31) usage("Bad w");
- if (k >= (1 << w)) usage("K too big");
-
- matrix = talloc(int, k*k);
- bitmatrix_copy = talloc(int, k*w*k*w);
- inverse = talloc(int, k*w*k*w);
-
- for (i = 0; i < k; i++) {
- for (j = 0; j < k; j++) {
- n = i ^ ((1 << w)-1-j);
- matrix[i*k+j] = (n == 0) ? 0 : galois_single_divide(1, n, w);
- }
- }
- bitmatrix = jerasure_matrix_to_bitmatrix(k, k, w, matrix);
-
- printf("<HTML><TITLE>jerasure_04");
- for (i = 1; i < argc; i++) printf(" %s", argv[i]);
- printf("</TITLE>\n");
- printf("<h3>jerasure_04");
- for (i = 1; i < argc; i++) printf(" %s", argv[i]);
- printf("</h3>\n");
- printf("<pre>\n");
-
- printf("The Cauchy Bit-Matrix:\n");
- jerasure_print_bitmatrix(bitmatrix, k*w, k*w, w);
- memcpy(bitmatrix_copy, bitmatrix, sizeof(int)*k*w*k*w);
- i = jerasure_invertible_bitmatrix(bitmatrix_copy, k*w);
- printf("\nInvertible: %s\n", (i == 1) ? "Yes" : "No");
- if (i == 1) {
- printf("\nInverse:\n");
- memcpy(bitmatrix_copy, bitmatrix, sizeof(int)*k*w*k*w);
- i = jerasure_invert_bitmatrix(bitmatrix_copy, inverse, k*w);
- jerasure_print_bitmatrix(inverse, k*w, k*w, w);
- identity = jerasure_matrix_multiply(inverse, bitmatrix, k*w, k*w, k*w, k*w, 2);
- printf("\nInverse times matrix (should be identity):\n");
- jerasure_print_bitmatrix(identity, k*w, k*w, w);
- }
- return 0;
-}