1 /* SPDX-License-Identifier: Apache-2.0 */ 2 /* Copyright 2021 IBM Corp. */ 3 4 #include "crc32.h" 5 6 #include <limits.h> 7 8 /* Very dumb CRC-32 implementation */ crc32(const void * buf,size_t len)9uint32_t crc32(const void *buf, size_t len) 10 { 11 const uint8_t *buf8 = buf; 12 uint32_t rem = 0xffffffff; 13 14 for (; len; len--) { 15 int i; 16 17 rem = rem ^ *buf8; 18 for (i = 0; i < CHAR_BIT; i++) 19 rem = (rem >> 1) ^ ((rem & 1) * 0xEDB88320); 20 21 buf8++; 22 } 23 24 return rem ^ 0xffffffff; 25 } 26