1 // SPDX-License-Identifier: LGPL-2.1-or-later
4 * BlueZ - Bluetooth protocol stack for Linux
6 * Copyright (C) 2011-2014 Intel Corporation
7 * Copyright (C) 2002-2010 Marcel Holtmann <marcel@holtmann.org>
18 uint32_t crc24_bit_reverse(uint32_t value)
23 for (i = 0; i < 24; i++)
24 result |= ((value >> i) & 1) << (23 - i);
29 uint32_t crc24_calculate(uint32_t preset, const uint8_t *data, uint8_t len)
31 uint32_t state = preset;
34 for (i = 0; i < len; i++) {
35 uint8_t n, cur = data[i];
37 for (n = 0; n < 8; n++) {
38 int next_bit = (state ^ cur) & 1;
52 uint32_t crc24_reverse(uint32_t crc, const uint8_t *data, uint8_t len)
57 for (i = 0; i < len; i++) {
58 uint8_t n, cur = data[len - i - 1];
60 for (n = 0; n < 8; n++) {
61 int top_bit = state >> 23;
63 state = (state << 1) & 0xffffff;
64 state |= top_bit ^ ((cur >> (7 - n)) & 1);