18c2ecf20Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0-only 28c2ecf20Sopenharmony_ci/* crc32hash.c - derived from linux/lib/crc32.c, GNU GPL v2 */ 38c2ecf20Sopenharmony_ci/* Usage example: 48c2ecf20Sopenharmony_ci$ ./crc32hash "Dual Speed" 58c2ecf20Sopenharmony_ci*/ 68c2ecf20Sopenharmony_ci 78c2ecf20Sopenharmony_ci#include <string.h> 88c2ecf20Sopenharmony_ci#include <stdio.h> 98c2ecf20Sopenharmony_ci#include <ctype.h> 108c2ecf20Sopenharmony_ci#include <stdlib.h> 118c2ecf20Sopenharmony_ci 128c2ecf20Sopenharmony_cistatic unsigned int crc32(unsigned char const *p, unsigned int len) 138c2ecf20Sopenharmony_ci{ 148c2ecf20Sopenharmony_ci int i; 158c2ecf20Sopenharmony_ci unsigned int crc = 0; 168c2ecf20Sopenharmony_ci while (len--) { 178c2ecf20Sopenharmony_ci crc ^= *p++; 188c2ecf20Sopenharmony_ci for (i = 0; i < 8; i++) 198c2ecf20Sopenharmony_ci crc = (crc >> 1) ^ ((crc & 1) ? 0xedb88320 : 0); 208c2ecf20Sopenharmony_ci } 218c2ecf20Sopenharmony_ci return crc; 228c2ecf20Sopenharmony_ci} 238c2ecf20Sopenharmony_ci 248c2ecf20Sopenharmony_ciint main(int argc, char **argv) { 258c2ecf20Sopenharmony_ci unsigned int result; 268c2ecf20Sopenharmony_ci if (argc != 2) { 278c2ecf20Sopenharmony_ci printf("no string passed as argument\n"); 288c2ecf20Sopenharmony_ci return -1; 298c2ecf20Sopenharmony_ci } 308c2ecf20Sopenharmony_ci result = crc32((unsigned char const *)argv[1], strlen(argv[1])); 318c2ecf20Sopenharmony_ci printf("0x%x\n", result); 328c2ecf20Sopenharmony_ci return 0; 338c2ecf20Sopenharmony_ci} 34