mirror of
https://gitee.com/openharmony/third_party_vulkan-loader
synced 2024-11-24 15:50:17 +00:00
4799c294d6
Separated headers into common groups, with system headers being first, then Vulkan API headers, followed by loader headers. Then alphabetized headers in each group. Due to moving _GNU_SOURCE to being set by cmake, there isn't any implicit dependency between the include order used. Made sure headers should be able to be included independently, such as including the vulkan headers where appropriate.
100 lines
2.8 KiB
C
100 lines
2.8 KiB
C
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/**
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* `murmurhash.h' - murmurhash
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*
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* copyright (c) 2014 joseph werle <joseph.werle@gmail.com>
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* Copyright (c) 2015-2021 The Khronos Group Inc.
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* Copyright (c) 2015-2021 Valve Corporation
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* Copyright (c) 2015-2021 LunarG, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and/or associated documentation files (the "Materials"), to
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* deal in the Materials without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Materials, and to permit persons to whom the Materials are
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice(s) and this permission notice shall be included in
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* all copies or substantial portions of the Materials.
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*
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* THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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*
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE MATERIALS OR THE
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* USE OR OTHER DEALINGS IN THE MATERIALS.
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*/
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#include "murmurhash.h"
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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uint32_t murmurhash(const char *key, size_t len, uint32_t seed) {
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uint32_t c1 = 0xcc9e2d51;
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uint32_t c2 = 0x1b873593;
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uint32_t r1 = 15;
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uint32_t r2 = 13;
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uint32_t m = 5;
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uint32_t n = 0xe6546b64;
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uint32_t h = 0;
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uint32_t k = 0;
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uint8_t *d = (uint8_t *)key; // 32 bit extract from `key'
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const uint32_t *chunks = NULL;
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const uint8_t *tail = NULL; // tail - last 8 bytes
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int i = 0;
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int l = (int)len / 4; // chunk length
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h = seed;
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chunks = (const uint32_t *)(d + l * 4); // body
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tail = (const uint8_t *)(d + l * 4); // last 8 byte chunk of `key'
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// for each 4 byte chunk of `key'
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for (i = -l; i != 0; ++i) {
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// next 4 byte chunk of `key'
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k = chunks[i];
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// encode next 4 byte chunk of `key'
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k *= c1;
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k = (k << r1) | (k >> (32 - r1));
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k *= c2;
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// append to hash
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h ^= k;
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h = (h << r2) | (h >> (32 - r2));
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h = h * m + n;
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}
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k = 0;
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// remainder
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switch (len & 3) { // `len % 4'
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case 3:
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k ^= (tail[2] << 16);
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// fall through
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case 2:
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k ^= (tail[1] << 8);
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// fall through
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case 1:
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k ^= tail[0];
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k *= c1;
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k = (k << r1) | (k >> (32 - r1));
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k *= c2;
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h ^= k;
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}
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h ^= len;
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h ^= (h >> 16);
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h *= 0x85ebca6b;
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h ^= (h >> 13);
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h *= 0xc2b2ae35;
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h ^= (h >> 16);
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return h;
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}
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