/usr/include/android/utils/JenkinsHash.h is in android-libutils-dev 1:7.0.0+r33-2.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 | /*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* Implementation of Jenkins one-at-a-time hash function. These choices are
* optimized for code size and portability, rather than raw speed. But speed
* should still be quite good.
**/
#ifndef ANDROID_JENKINS_HASH_H
#define ANDROID_JENKINS_HASH_H
#include <utils/TypeHelpers.h>
namespace android {
/* The Jenkins hash of a sequence of 32 bit words A, B, C is:
* Whiten(Mix(Mix(Mix(0, A), B), C)) */
#ifdef __clang__
__attribute__((no_sanitize("integer")))
#endif
inline uint32_t JenkinsHashMix(uint32_t hash, uint32_t data) {
hash += data;
hash += (hash << 10);
hash ^= (hash >> 6);
return hash;
}
hash_t JenkinsHashWhiten(uint32_t hash);
/* Helpful utility functions for hashing data in 32 bit chunks */
uint32_t JenkinsHashMixBytes(uint32_t hash, const uint8_t* bytes, size_t size);
uint32_t JenkinsHashMixShorts(uint32_t hash, const uint16_t* shorts, size_t size);
}
#endif // ANDROID_JENKINS_HASH_H
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