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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