162306a36Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0-only 262306a36Sopenharmony_ci/* crc32hash.c - derived from linux/lib/crc32.c, GNU GPL v2 */ 362306a36Sopenharmony_ci/* Usage example: 462306a36Sopenharmony_ci$ ./crc32hash "Dual Speed" 562306a36Sopenharmony_ci*/ 662306a36Sopenharmony_ci 762306a36Sopenharmony_ci#include <string.h> 862306a36Sopenharmony_ci#include <stdio.h> 962306a36Sopenharmony_ci#include <ctype.h> 1062306a36Sopenharmony_ci#include <stdlib.h> 1162306a36Sopenharmony_ci 1262306a36Sopenharmony_cistatic unsigned int crc32(unsigned char const *p, unsigned int len) 1362306a36Sopenharmony_ci{ 1462306a36Sopenharmony_ci int i; 1562306a36Sopenharmony_ci unsigned int crc = 0; 1662306a36Sopenharmony_ci while (len--) { 1762306a36Sopenharmony_ci crc ^= *p++; 1862306a36Sopenharmony_ci for (i = 0; i < 8; i++) 1962306a36Sopenharmony_ci crc = (crc >> 1) ^ ((crc & 1) ? 0xedb88320 : 0); 2062306a36Sopenharmony_ci } 2162306a36Sopenharmony_ci return crc; 2262306a36Sopenharmony_ci} 2362306a36Sopenharmony_ci 2462306a36Sopenharmony_ciint main(int argc, char **argv) { 2562306a36Sopenharmony_ci unsigned int result; 2662306a36Sopenharmony_ci if (argc != 2) { 2762306a36Sopenharmony_ci printf("no string passed as argument\n"); 2862306a36Sopenharmony_ci return -1; 2962306a36Sopenharmony_ci } 3062306a36Sopenharmony_ci result = crc32((unsigned char const *)argv[1], strlen(argv[1])); 3162306a36Sopenharmony_ci printf("0x%x\n", result); 3262306a36Sopenharmony_ci return 0; 3362306a36Sopenharmony_ci} 34