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/*!A cross-platform build utility based on Lua
*
* 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.
*
* Copyright (C) 2015-present, Xmake Open Source Community.
*
* @author ruki
* @file prefix.h
*
*/
#ifndef XM_HASH_PREFIX_H
#define XM_HASH_PREFIX_H
/* //////////////////////////////////////////////////////////////////////////////////////
* includes
*/
#include "../prefix.h"
/* //////////////////////////////////////////////////////////////////////////////////////
* helper implementation
*/
static __tb_inline__ tb_uint64_t xm_hash_xorshift64(tb_uint64_t x) {
x ^= x << 13;
x ^= x >> 7;
x ^= x << 17;
return x;
}
// http://xorshift.di.unimi.it/xorshift128plus.c
static __tb_inline__ tb_uint64_t xm_hash_xorshift128(tb_uint64_t *s) {
tb_uint64_t s1 = s[0];
tb_uint64_t const s0 = s[1];
s[0] = s0;
s1 ^= s1 << 23;
s[1] = s1 ^ s0 ^ (s1 >> 18) ^ (s0 >> 5);
return s[1] + s0;
}
static __tb_inline__ tb_size_t xm_hash_make_cstr(tb_char_t hash[256], tb_byte_t const *data, tb_size_t size) {
static tb_char_t const *digits_table = "0123456789abcdef";
tb_size_t i = 0;
tb_byte_t value;
tb_char_t *s = hash;
for (i = 0; i < size; ++i) {
value = data[i];
s[0] = digits_table[(value >> 4) & 15];
s[1] = digits_table[value & 15];
s += 2;
}
*s = '\0';
return s - hash;
}
#endif
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