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94 lines
3.2 KiB
C++
94 lines
3.2 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $URL$
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* $Id$
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*
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*/
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// The hash map (associative array) implementation in this file is
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// based on code by Andrew Y. Ng, 1996:
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/*
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* Copyright (c) 1998-2003 Massachusetts Institute of Technology.
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* This code was developed as part of the Haystack research project
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* (http://haystack.lcs.mit.edu/). Permission is hereby granted,
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* free of charge, to any person obtaining a copy of this software
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* and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute,
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* sublicense, and/or sell copies of the Software, and to permit
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* persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "common/hashmap.h"
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namespace Common {
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// const char *:
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uint hashit(const char *p) {
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uint hash = 0;
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byte c;
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while ((c = *p++))
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hash = (hash * 31 + c);
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return hash;
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}
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uint hashit_lower(const char *p) {
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uint hash = 0;
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byte c;
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while ((c = *p++))
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hash = (hash * 31 + tolower(c));
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return hash;
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}
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// The following table is taken from the GNU ISO C++ Library's hashtable.h file.
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static const uint primes[] = {
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53ul, 97ul, 193ul, 389ul, 769ul,
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1543ul, 3079ul, 6151ul, 12289ul, 24593ul,
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49157ul, 98317ul, 196613ul, 393241ul, 786433ul,
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1572869ul, 3145739ul, 6291469ul, 12582917ul, 25165843ul,
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50331653ul, 100663319ul, 201326611ul, 402653189ul, 805306457ul,
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1610612741ul, 3221225473ul, 4294967291ul
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};
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uint nextTableSize(uint x) {
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int i = 0;
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while (x >= primes[i])
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i++;
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return primes[i];
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}
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} // End of namespace Common
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