95 lines
2.9 KiB
C
95 lines
2.9 KiB
C
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/*
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* Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
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* Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list
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* of conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _LOS_HASH_H
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#define _LOS_HASH_H
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#include "los_typedef.h"
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#ifdef __cplusplus
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#if __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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#endif /* __cplusplus */
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#define FNV1_32A_INIT ((UINT32)0x811c9dc5)
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/*
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* 32 bit magic FNV-1 prime
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*/
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#define FNV_32_PRIME ((UINT32)0x01000193)
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LITE_OS_SEC_ALW_INLINE STATIC INLINE UINT32 LOS_HashFNV32aBuf(const VOID *buf, size_t len, UINT32 hval)
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{
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const UINT8 *hashbuf = (const UINT8 *)buf;
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/*
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* FNV-1a hash each octet in the buffer
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*/
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while (len-- != 0) {
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/* xor the bottom with the current octet */
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hval ^= (UINT32)*hashbuf++;
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/* multiply by the 32 bit FNV magic prime mod 2^32 */
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hval *= FNV_32_PRIME;
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}
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/* return our new hash value */
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return hval;
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}
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LITE_OS_SEC_ALW_INLINE STATIC INLINE UINT32 LOS_HashFNV32aStr(CHAR *str, UINT32 hval)
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{
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UINT8 *s = (UINT8 *)str;
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/*
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* FNV-1a hash each octet in the buffer
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*/
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while (*s) {
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/* xor the bottom with the current octet */
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hval ^= (UINT32)*s++;
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/* multiply by the 32 bit FNV magic prime mod 2^32 */
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hval *= FNV_32_PRIME;
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}
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/* return our new hash value */
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return hval;
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}
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#ifdef __cplusplus
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#if __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* __cplusplus */
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#endif /* _LOS_HASH_H */
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