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/* ----------------------------------------------------------------------- *
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* This file is part of GEL, http://www.imm.dtu.dk/GEL
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* Copyright (C) the authors and DTU Informatics
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* For license and list of authors, see ../../doc/intro.pdf
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* ----------------------------------------------------------------------- */
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/**
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* @file HashKey.h
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* @brief Kehy class for hash tables.
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*/
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#ifndef __UTIL_HASHKEY_H
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#define __UTIL_HASHKEY_H
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#include <stdlib.h>
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#include <limits.h>
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#include "../CGLA/Vec3uc.h"
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#include "../CGLA/Vec3usi.h"
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namespace Util
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{
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extern int randoms1[UCHAR_MAX];
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extern int randoms2[UCHAR_MAX];
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extern int randoms3[UCHAR_MAX];
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bool init_randoms();
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void do_init_randoms();
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struct HashKey3uc
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{
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CGLA::Vec3uc key;
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HashKey3uc() {do_init_randoms();}
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HashKey3uc(CGLA::Vec3uc _key): key(_key) {do_init_randoms();}
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HashKey3uc(CGLA::Vec3i _key): key(_key) {do_init_randoms();}
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int hash(int use_size) const
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{
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return int((randoms1[key[0]] >> (key[1]&0x0f)) +
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(randoms2[key[1]] >> (key[2]&0x0f)) +
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(randoms3[key[2]] >> (key[0]&0x0f))) & (use_size-1);
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}
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bool operator==(const HashKey3uc& k2) const {return key==k2.key;}
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bool operator!=(const HashKey3uc& k2) const {return !(key==k2.key);}
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};
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struct HashKey3usi
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{
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CGLA::Vec3usi key;
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HashKey3usi() {do_init_randoms();}
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HashKey3usi(CGLA::Vec3usi _key): key(_key) {do_init_randoms();}
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HashKey3usi(CGLA::Vec3i _key): key(_key) {do_init_randoms();}
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int hash(int use_size) const
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{
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return int(
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((randoms1[key[0]&0xff00>>8] * randoms2[key[1]&0xff] >> (key[2]&0x0f))
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+ (randoms2[key[1]&0xff00>>8] * randoms1[key[2]&0xff] >> (key[0]&0x0f))
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+ (randoms3[key[2]&0xff00>>8] * randoms3[key[0]&0xff] >> (key[1]&0x0f)))
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& (use_size-1));
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}
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bool operator==(const HashKey3usi& k2) const {return key==k2.key;}
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bool operator!=(const HashKey3usi& k2) const {return !(key==k2.key);}
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};
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struct HashKey1c
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{
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unsigned char key;
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HashKey1c() {do_init_randoms();}
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HashKey1c(unsigned char _key): key(_key) {do_init_randoms();}
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int hash(int use_size) const
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{
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return int(randoms1[key] & (use_size-1));
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}
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bool operator==(const HashKey1c& k2) const {return key==k2.key;}
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bool operator!=(const HashKey1c& k2) const {return !(key==k2.key);}
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};
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}
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#endif
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