kernel_liteos_a/kernel/include/los_hash.h

95 lines
2.9 KiB
C

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