1 /*
2 * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
3 * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without modification,
6 * are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this list of
9 * conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice, this list
12 * of conditions and the following disclaimer in the documentation and/or other materials
13 * provided with the distribution.
14 *
15 * 3. Neither the name of the copyright holder nor the names of its contributors may be used
16 * to endorse or promote products derived from this software without specific prior written
17 * permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
21 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
26 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
28 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
29 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include "los_crc32.h"
33
34
35 #define COUNT1 val = crc32_tab[(val ^ (*src++)) & 0xff] ^ (val >> 8)
36 #define COUNT2 COUNT1; COUNT1
37 #define COUNT4 COUNT2; COUNT2
38 #define COUNT8 COUNT4; COUNT4
39
40 #define ACCRATIO 8
41
LOS_EtherCrc32Accumulate(UINT32 val,UINT8 * src,INT32 len)42 UINT32 LOS_EtherCrc32Accumulate(UINT32 val, UINT8 *src, INT32 len)
43 {
44 if (src == 0) {
45 return 0L;
46 }
47
48 val = val ^ 0xffffffffUL;
49 while (len >= ACCRATIO) {
50 COUNT8;
51 len -= ACCRATIO;
52 }
53 while (len--) {
54 COUNT1;
55 }
56
57 return val ^ 0xffffffffUL;
58 }
59
LOS_Crc32Accumulate(UINT32 val,UINT8 * src,INT32 len)60 UINT32 LOS_Crc32Accumulate(UINT32 val, UINT8 *src, INT32 len)
61 {
62 while (len >= ACCRATIO) {
63 COUNT8;
64 len -= ACCRATIO;
65 }
66 while (len--) {
67 COUNT1;
68 }
69
70 return val;
71 }
72
73