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 #ifndef _LOS_HASH_H
33 #define _LOS_HASH_H
34
35 #include "los_typedef.h"
36
37 #ifdef __cplusplus
38 #if __cplusplus
39 extern "C" {
40 #endif /* __cplusplus */
41 #endif /* __cplusplus */
42
43 #define FNV1_32A_INIT ((UINT32)0x811c9dc5)
44
45 /*
46 * 32 bit magic FNV-1 prime
47 */
48 #define FNV_32_PRIME ((UINT32)0x01000193)
49
LOS_HashFNV32aBuf(const VOID * buf,size_t len,UINT32 hval)50 LITE_OS_SEC_ALW_INLINE STATIC INLINE UINT32 LOS_HashFNV32aBuf(const VOID *buf, size_t len, UINT32 hval)
51 {
52 const UINT8 *hashbuf = (const UINT8 *)buf;
53
54 /*
55 * FNV-1a hash each octet in the buffer
56 */
57 while (len-- != 0) {
58 /* xor the bottom with the current octet */
59 hval ^= (UINT32)*hashbuf++;
60
61 /* multiply by the 32 bit FNV magic prime mod 2^32 */
62 hval *= FNV_32_PRIME;
63 }
64
65 /* return our new hash value */
66 return hval;
67 }
68
LOS_HashFNV32aStr(CHAR * str,UINT32 hval)69 LITE_OS_SEC_ALW_INLINE STATIC INLINE UINT32 LOS_HashFNV32aStr(CHAR *str, UINT32 hval)
70 {
71 UINT8 *s = (UINT8 *)str;
72
73 /*
74 * FNV-1a hash each octet in the buffer
75 */
76 while (*s) {
77 /* xor the bottom with the current octet */
78 hval ^= (UINT32)*s++;
79
80 /* multiply by the 32 bit FNV magic prime mod 2^32 */
81 hval *= FNV_32_PRIME;
82 }
83
84 /* return our new hash value */
85 return hval;
86 }
87
88 #ifdef __cplusplus
89 #if __cplusplus
90 }
91 #endif /* __cplusplus */
92 #endif /* __cplusplus */
93
94 #endif /* _LOS_HASH_H */
95