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hash.cpp
1 /* enchant
2  * Copyright (C) 2003 Dom Lachowicz
3  *
4  * This library is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * This library is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with this library; if not, write to the
16  * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17  * Boston, MA 02110-1301, USA.
18  *
19  * In addition, as a special exception, Dom Lachowicz
20  * gives permission to link the code of this program with
21  * non-LGPL Spelling Provider libraries (eg: a MSFT Office
22  * spell checker backend) and distribute linked combinations including
23  * the two. You must obey the GNU Lesser General Public License in all
24  * respects for all of the code used other than said providers. If you modify
25  * this file, you may extend this exception to your version of the
26  * file, but you are not obligated to do so. If you do not wish to
27  * do so, delete this exception statement from your version.
28  */
29 
30 /*
31  * hash.c - a simple hash function for ispell
32  *
33  * Pace Willisson, 1983
34  *
35  * Copyright 1992, 1993, Geoff Kuenning, Granada Hills, CA
36  * All rights reserved.
37  *
38  * Redistribution and use in source and binary forms, with or without
39  * modification, are permitted provided that the following conditions
40  * are met:
41  *
42  * 1. Redistributions of source code must retain the above copyright
43  * notice, this list of conditions and the following disclaimer.
44  * 2. Redistributions in binary form must reproduce the above copyright
45  * notice, this list of conditions and the following disclaimer in the
46  * documentation and/or other materials provided with the distribution.
47  * 3. All modifications to the source code must be clearly marked as
48  * such. Binary redistributions based on modified source code
49  * must be clearly marked as modified versions in the documentation
50  * and/or other materials provided with the distribution.
51  * 4. All advertising materials mentioning features or use of this software
52  * must display the following acknowledgment:
53  * This product includes software developed by Geoff Kuenning and
54  * other unpaid contributors.
55  * 5. The name of Geoff Kuenning may not be used to endorse or promote
56  * products derived from this software without specific prior
57  * written permission.
58  *
59  * THIS SOFTWARE IS PROVIDED BY GEOFF KUENNING AND CONTRIBUTORS ``AS IS'' AND
60  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
61  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
62  * ARE DISCLAIMED. IN NO EVENT SHALL GEOFF KUENNING OR CONTRIBUTORS BE LIABLE
63  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
64  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
65  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
66  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
67  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
68  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
69  * SUCH DAMAGE.
70  */
71 
72 /*
73  * $Log$
74  * Revision 1.1 2004/01/31 16:44:12 zrusin
75  * ISpell plugin.
76  *
77  * Revision 1.4 2003/08/14 17:51:27 dom
78  * update license - exception clause should be Lesser GPL
79  *
80  * Revision 1.3 2003/07/28 20:40:26 dom
81  * fix up the license clause, further win32-registry proof some directory getting functions
82  *
83  * Revision 1.2 2003/07/16 22:52:39 dom
84  * LGPL + exception license
85  *
86  * Revision 1.1 2003/07/15 01:15:05 dom
87  * ispell enchant backend
88  *
89  * Revision 1.2 2003/01/29 05:50:11 hippietrail
90  *
91  * Fixed my mess in EncodingManager.
92  * Changed many C casts to C++ casts.
93  *
94  * Revision 1.1 2003/01/24 05:52:33 hippietrail
95  *
96  * Refactored ispell code. Old ispell global variables had been put into
97  * an allocated structure, a pointer to which was passed to many functions.
98  * I have now made all such functions and variables private members of the
99  * ISpellChecker class. It was C OO, now it's C++ OO.
100  *
101  * I've fixed the makefiles and tested compilation but am unable to test
102  * operation. Please back out my changes if they cause problems which
103  * are not obvious or easy to fix.
104  *
105  * Revision 1.5 2002/09/19 05:31:15 hippietrail
106  *
107  * More Ispell cleanup. Conditional globals and DEREF macros are removed.
108  * K&R function declarations removed, converted to Doxygen style comments
109  * where possible. No code has been changed (I hope). Compiles for me but
110  * unable to test.
111  *
112  * Revision 1.4 2002/09/17 03:03:29 hippietrail
113  *
114  * After seeking permission on the developer list I've reformatted all the
115  * spelling source which seemed to have parts which used 2, 3, 4, and 8
116  * spaces for tabs. It should all look good with our standard 4-space
117  * tabs now.
118  * I've concentrated just on indentation in the actual code. More prettying
119  * could be done.
120  * * NO code changes were made *
121  *
122  * Revision 1.3 2002/09/13 17:20:13 mpritchett
123  * Fix more warnings for Linux build
124  *
125  * Revision 1.2 2001/05/12 16:05:42 thomasf
126  * Big pseudo changes to ispell to make it pass around a structure rather
127  * than rely on all sorts of gloabals willy nilly here and there. Also
128  * fixed our spelling class to work with accepting suggestions once more.
129  * This code is dirty, gross and ugly (not to mention still not supporting
130  * multiple hash sized just yet) but it works on my machine and will no
131  * doubt break other machines.
132  *
133  * Revision 1.1 2001/04/15 16:01:24 tomas_f
134  * moving to spell/xp
135  *
136  * Revision 1.3 1998/12/29 14:55:33 eric
137  *
138  * I've doctored the ispell code pretty extensively here. It is now
139  * warning-free on Win32. It also *works* on Win32 now, since I
140  * replaced all the I/O calls with ANSI standard ones.
141  *
142  * Revision 1.2 1998/12/28 23:11:30 eric
143  *
144  * modified spell code and integration to build on Windows.
145  * This is still a hack.
146  *
147  * Actually, it doesn't yet WORK on Windows. It just builds.
148  * SpellCheckInit is failing for some reason.
149  *
150  * Revision 1.1 1998/12/28 18:04:43 davet
151  * Spell checker code stripped from ispell. At this point, there are
152  * two external routines... the Init routine, and a check-a-word routine
153  * which returns a boolean value, and takes a 16 bit char string.
154  * The code resembles the ispell code as much as possible still.
155  *
156  * Revision 1.20 1994/01/25 07:11:34 geoff
157  * Get rid of all old RCS log lines in preparation for the 3.1 release.
158  *
159  */
160 
161 #include "ispell_checker.h"
162 
163 /*
164  * The following hash algorithm is due to Ian Dall, with slight modifications
165  * by Geoff Kuenning to reflect the results of testing with the English
166  * dictionaries actually distributed with ispell.
167  */
168 #define HASHSHIFT 5
169 
170 #ifdef NO_CAPITALIZATION_SUPPORT
171 #define HASHUPPER(c) c
172 #else /* NO_CAPITALIZATION_SUPPORT */
173 #define HASHUPPER(c) mytoupper(c)
174 #endif /* NO_CAPITALIZATION_SUPPORT */
175 
176 /*
177  * \param s
178  * \param hashtblsize
179  */
180 int ISpellChecker::hash (ichar_t *s, int hashtblsize)
181 {
182  long h = 0;
183  int i;
184 
185 #ifdef ICHAR_IS_CHAR
186  for (i = 4; i-- && *s != 0; )
187  h = (h << 8) | HASHUPPER (*s++);
188 #else /* ICHAR_IS_CHAR */
189  for (i = 2; i-- && *s != 0; )
190  h = (h << 16) | HASHUPPER (*s++);
191 #endif /* ICHAR_IS_CHAR */
192  while (*s != 0)
193  {
194  /*
195  * We have to do circular shifts the hard way, since C doesn't
196  * have them even though the hardware probably does. Oh, well.
197  */
198  h = (h << HASHSHIFT)
199  | ((h >> (32 - HASHSHIFT)) & ((1 << HASHSHIFT) - 1));
200  h ^= HASHUPPER (*s++);
201  }
202  return static_cast<unsigned long>(h) % hashtblsize;
203 }

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