mirror of
https://github.com/godotengine/godot.git
synced 2025-10-31 13:41:03 +00:00
116 lines
3.4 KiB
C++
116 lines
3.4 KiB
C++
/*************************************************************************/
|
|
/* hashfuncs.h */
|
|
/*************************************************************************/
|
|
/* This file is part of: */
|
|
/* GODOT ENGINE */
|
|
/* http://www.godotengine.org */
|
|
/*************************************************************************/
|
|
/* Copyright (c) 2007-2016 Juan Linietsky, Ariel Manzur. */
|
|
/* */
|
|
/* Permission is hereby granted, free of charge, to any person obtaining */
|
|
/* a copy of this software and associated documentation files (the */
|
|
/* "Software"), to deal in the Software without restriction, including */
|
|
/* without limitation the rights to use, copy, modify, merge, publish, */
|
|
/* distribute, sublicense, and/or sell copies of the Software, and to */
|
|
/* permit persons to whom the Software is furnished to do so, subject to */
|
|
/* the following conditions: */
|
|
/* */
|
|
/* The above copyright notice and this permission notice shall be */
|
|
/* included in all copies or substantial portions of the Software. */
|
|
/* */
|
|
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
|
|
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
|
|
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
|
|
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
|
|
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
|
|
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
|
|
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
|
|
/*************************************************************************/
|
|
#ifndef HASHFUNCS_H
|
|
#define HASHFUNCS_H
|
|
|
|
|
|
#include "typedefs.h"
|
|
|
|
/**
|
|
* Hashing functions
|
|
*/
|
|
|
|
|
|
/**
|
|
* DJB2 Hash function
|
|
* @param C String
|
|
* @return 32-bits hashcode
|
|
*/
|
|
static inline uint32_t hash_djb2(const char *p_cstr) {
|
|
|
|
const unsigned char* chr=(const unsigned char*)p_cstr;
|
|
uint32_t hash = 5381;
|
|
uint32_t c;
|
|
|
|
while ((c = *chr++))
|
|
hash = ((hash << 5) + hash) + c; /* hash * 33 + c */
|
|
|
|
return hash;
|
|
}
|
|
|
|
static inline uint32_t hash_djb2_buffer(const uint8_t *p_buff, int p_len,uint32_t p_prev=5381) {
|
|
|
|
uint32_t hash = p_prev;
|
|
|
|
for(int i=0;i<p_len;i++)
|
|
hash = ((hash << 5) + hash) + p_buff[i]; /* hash * 33 + c */
|
|
|
|
return hash;
|
|
}
|
|
|
|
static inline uint32_t hash_djb2_one_32(uint32_t p_in,uint32_t p_prev=5381) {
|
|
|
|
return ((p_prev<<5)+p_prev)+p_in;
|
|
}
|
|
|
|
static inline uint32_t hash_djb2_one_float(float p_in,uint32_t p_prev=5381) {
|
|
union {
|
|
float f;
|
|
uint32_t i;
|
|
} u;
|
|
u.f=p_in;
|
|
|
|
return ((p_prev<<5)+p_prev)+u.i;
|
|
}
|
|
|
|
template<class T>
|
|
static inline uint32_t make_uint32_t(T p_in) {
|
|
|
|
union {
|
|
T t;
|
|
uint32_t _u32;
|
|
} _u;
|
|
_u._u32=0;
|
|
_u.t=p_in;
|
|
return _u._u32;
|
|
}
|
|
|
|
|
|
static inline uint64_t hash_djb2_one_64(uint64_t p_in,uint64_t p_prev=5381) {
|
|
|
|
return ((p_prev<<5)+p_prev)+p_in;
|
|
}
|
|
|
|
|
|
template<class T>
|
|
static inline uint64_t make_uint64_t(T p_in) {
|
|
|
|
union {
|
|
T t;
|
|
uint64_t _u64;
|
|
} _u;
|
|
_u._u64=0; // in case p_in is smaller
|
|
|
|
_u.t=p_in;
|
|
return _u._u64;
|
|
}
|
|
|
|
|
|
|
|
#endif
|