// SPDX-License-Identifier: GPL-2.0-only /* crc32hash.c - derived from linux/lib/crc32.c, GNU GPL v2 */ /* Usage example: $ ./crc32hash "Dual Speed" */ #include <string.h> #include <stdio.h> #include <ctype.h> #include <stdlib.h> static unsigned int crc32(unsigned char const *p, unsigned int len) { int i; unsigned int crc = 0; while (len--) { crc ^= *p++; for (i = 0; i < 8; i++) crc = (crc >> 1) ^ ((crc & 1) ? 0xedb88320 : 0); } return crc; } int main(int argc, char **argv) { unsigned int result; if (argc != 2) { printf("no string passed as argument\n"); return -1; } result = crc32((unsigned char const *)argv[1], strlen(argv[1])); printf("0x%x\n", result); return 0; }