61355e51b8
Fixes #fdo30794 Based on bin/add-modelines script (originally posted in mail 1286706307.1871.1399280959@webmail.messagingengine.com) Signed-off-by: Sebastian Spaeth <Sebastian@SSpaeth.de>
107 lines
3 KiB
C++
107 lines
3 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*************************************************************************
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*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* Copyright 2000, 2010 Oracle and/or its affiliates.
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*
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* OpenOffice.org - a multi-platform office productivity suite
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*
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* This file is part of OpenOffice.org.
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*
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* OpenOffice.org is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License version 3
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* only, as published by the Free Software Foundation.
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*
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* OpenOffice.org 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 Lesser General Public License version 3 for more details
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* (a copy is included in the LICENSE file that accompanied this code).
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*
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* You should have received a copy of the GNU Lesser General Public License
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* version 3 along with OpenOffice.org. If not, see
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* <http://www.openoffice.org/license.html>
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* for a copy of the LGPLv3 License.
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*
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************************************************************************/
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#ifndef _STRINGHASH_HXX
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#define _STRINGHASH_HXX
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#include <tools/string.hxx>
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struct StringEq
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{
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sal_Bool operator() ( const String *r1,
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const String *r2) const
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{
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return r1->Equals(*r2);
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}
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};
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struct StringEqRef
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{
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sal_Bool operator() (const String &r1, const String &r2) const
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{
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return r1.Equals(r2);
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}
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};
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struct StringHash
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{
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size_t operator() ( const String *rString) const
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{
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sal_Int32 h, nLen;
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h = nLen = rString->Len();
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const sal_Unicode *pStr = rString->GetBuffer();
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if ( nLen < 16 )
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while ( nLen-- > 0 )
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h = (h*37) + *(pStr++);
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else
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{
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sal_Int32 nSkip;
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const sal_Unicode* pEndStr = pStr+nLen-5;
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/* only sample some characters */
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/* the first 3, some characters between, and the last 5 */
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h = (h*39) + *(pStr++);
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h = (h*39) + *(pStr++);
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h = (h*39) + *(pStr++);
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nSkip = nLen / nLen < 32 ? 4 : 8;
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nLen -= 8;
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while ( nLen > 0 )
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{
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h = (h*39) + ( *pStr );
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pStr += nSkip;
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nLen -= nSkip;
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}
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h = (h*39) + *(pEndStr++);
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h = (h*39) + *(pEndStr++);
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h = (h*39) + *(pEndStr++);
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h = (h*39) + *(pEndStr++);
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h = (h*39) + *(pEndStr++);
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}
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return h;
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}
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size_t operator() (const String & rStr) const
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{
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return (*this)(&rStr);
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}
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};
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struct StringHashRef
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{
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size_t operator () (const String &rStr) const
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{
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StringHash aStrHash;
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return aStrHash(&rStr);
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}
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};
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#endif // _STRINGHASH_HXX
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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