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205 lines
7.9 KiB
205 lines
7.9 KiB
/* vim: set sw=8: -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
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/* enchant
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* Copyright (C) 2003 Dom Lachowicz
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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* In addition, as a special exception, Dom Lachowicz
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* gives permission to link the code of this program with
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* non-LGPL Spelling Provider libraries (eg: a MSFT Office
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* spell checker backend) and distribute linked combinations including
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* the two. You must obey the GNU Lesser General Public License in all
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* respects for all of the code used other than said providers. If you modify
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* this file, you may extend this exception to your version of the
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* file, but you are not obligated to do so. If you do not wish to
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* do so, delete this exception statement from your version.
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*/
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/*
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* hash.c - a simple hash function for ispell
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*
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* Pace Willisson, 1983
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*
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* Copyright 1992, 1993, Geoff Kuenning, Granada Hills, CA
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All modifications to the source code must be clearly marked as
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* such. Binary redistributions based on modified source code
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* must be clearly marked as modified versions in the documentation
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* and/or other materials provided with the distribution.
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* 4. All advertising materials mentioning features or use of this software
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* must display the following acknowledgment:
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* This product includes software developed by Geoff Kuenning and
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* other unpaid contributors.
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* 5. The name of Geoff Kuenning may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY GEOFF KUENNING AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL GEOFF KUENNING OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* $Log$
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* Revision 1.1 2004/01/31 16:44:12 zrusin
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* ISpell plugin.
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*
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* Revision 1.4 2003/08/14 17:51:27 dom
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* update license - exception clause should be Lesser GPL
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*
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* Revision 1.3 2003/07/28 20:40:26 dom
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* fix up the license clause, further win32-registry proof some directory getting functions
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*
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* Revision 1.2 2003/07/16 22:52:39 dom
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* LGPL + exception license
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*
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* Revision 1.1 2003/07/15 01:15:05 dom
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* ispell enchant backend
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*
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* Revision 1.2 2003/01/29 05:50:11 hippietrail
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*
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* Fixed my mess in EncodingManager.
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* Changed many C casts to C++ casts.
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*
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* Revision 1.1 2003/01/24 05:52:33 hippietrail
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*
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* Refactored ispell code. Old ispell global variables had been put into
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* an allocated structure, a pointer to which was passed to many functions.
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* I have now made all such functions and variables private members of the
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* ISpellChecker class. It was C OO, now it's C++ OO.
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*
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* I've fixed the makefiles and tested compilation but am unable to test
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* operation. Please back out my changes if they cause problems which
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* are not obvious or easy to fix.
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*
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* Revision 1.5 2002/09/19 05:31:15 hippietrail
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*
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* More Ispell cleanup. Conditional globals and DEREF macros are removed.
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* K&R function declarations removed, converted to Doxygen style comments
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* where possible. No code has been changed (I hope). Compiles for me but
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* unable to test.
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*
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* Revision 1.4 2002/09/17 03:03:29 hippietrail
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*
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* After seeking permission on the developer list I've reformatted all the
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* spelling source which seemed to have parts which used 2, 3, 4, and 8
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* spaces for tabs. It should all look good with our standard 4-space
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* tabs now.
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* I've concentrated just on indentation in the actual code. More prettying
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* could be done.
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* * NO code changes were made *
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*
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* Revision 1.3 2002/09/13 17:20:13 mpritchett
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* Fix more warnings for Linux build
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*
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* Revision 1.2 2001/05/12 16:05:42 thomasf
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* Big pseudo changes to ispell to make it pass around a structure rather
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* than rely on all sorts of gloabals willy nilly here and there. Also
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* fixed our spelling class to work with accepting suggestions once more.
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* This code is dirty, gross and ugly (not to mention still not supporting
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* multiple hash sized just yet) but it works on my machine and will no
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* doubt break other machines.
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*
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* Revision 1.1 2001/04/15 16:01:24 tomas_f
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* moving to spell/xp
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*
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* Revision 1.3 1998/12/29 14:55:33 eric
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*
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* I've doctored the ispell code pretty extensively here. It is now
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* warning-free on Win32. It also *works* on Win32 now, since I
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* replaced all the I/O calls with ANSI standard ones.
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*
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* Revision 1.2 1998/12/28 23:11:30 eric
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*
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* modified spell code and integration to build on Windows.
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* This is still a hack.
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*
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* Actually, it doesn't yet WORK on Windows. It just builds.
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* SpellCheckInit is failing for some reason.
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*
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* Revision 1.1 1998/12/28 18:04:43 davet
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* Spell checker code stripped from ispell. At this point, there are
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* two external routines... the Init routine, and a check-a-word routine
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* which returns a boolean value, and takes a 16 bit char string.
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* The code resembles the ispell code as much as possible still.
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*
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* Revision 1.20 1994/01/25 07:11:34 geoff
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* Get rid of all old RCS log lines in preparation for the 3.1 release.
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*
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*/
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#include "ispell_checker.h"
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/*
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* The following hash algorithm is due to Ian Dall, with slight modifications
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* by Geoff Kuenning to reflect the results of testing with the English
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* dictionaries actually distributed with ispell.
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*/
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#define HASHSHIFT 5
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#ifdef NO_CAPITALIZATION_SUPPORT
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#define HASHUPPER(c) c
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#else /* NO_CAPITALIZATION_SUPPORT */
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#define HASHUPPER(c) mytoupper(c)
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#endif /* NO_CAPITALIZATION_SUPPORT */
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/*
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* \param s
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* \param hashtblsize
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*/
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int ISpellChecker::hash (ichar_t *s, int hashtblsize)
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{
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long h = 0;
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int i;
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#ifdef ICHAR_IS_CHAR
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for (i = 4; i-- && *s != 0; )
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h = (h << 8) | HASHUPPER (*s++);
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#else /* ICHAR_IS_CHAR */
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for (i = 2; i-- && *s != 0; )
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h = (h << 16) | HASHUPPER (*s++);
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#endif /* ICHAR_IS_CHAR */
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while (*s != 0)
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{
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/*
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* We have to do circular shifts the hard way, since C doesn't
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* have them even though the hardware probably does. Oh, well.
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*/
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h = (h << HASHSHIFT)
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| ((h >> (32 - HASHSHIFT)) & ((1 << HASHSHIFT) - 1));
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h ^= HASHUPPER (*s++);
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}
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return static_cast<unsigned long>(h) % hashtblsize;
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}
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