1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
|
/**
* @file llstringtable.h
* @brief The LLStringTable class provides a _fast_ method for finding
* unique copies of strings.
*
* $LicenseInfo:firstyear=2001&license=viewergpl$
*
* Copyright (c) 2001-2009, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at
* http://secondlifegrid.net/programs/open_source/licensing/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
* $/LicenseInfo$
*/
#ifndef LL_STRING_TABLE_H
#define LL_STRING_TABLE_H
#include "lldefs.h"
#include "llformat.h"
#include "llstl.h"
#include <list>
#include <set>
#if LL_WINDOWS
# if (_MSC_VER >= 1300 && _MSC_VER < 1400)
# define STRING_TABLE_HASH_MAP 1
# endif
#else
//# define STRING_TABLE_HASH_MAP 1
#endif
#if STRING_TABLE_HASH_MAP
# if LL_WINDOWS
# include <hash_map>
# else
# include <ext/hash_map>
# endif
#endif
const U32 MAX_STRINGS_LENGTH = 256;
class LL_COMMON_API LLStringTableEntry
{
public:
LLStringTableEntry(const char *str);
~LLStringTableEntry();
void incCount() { mCount++; }
BOOL decCount() { return --mCount; }
char *mString;
S32 mCount;
};
class LL_COMMON_API LLStringTable
{
public:
LLStringTable(int tablesize);
~LLStringTable();
char *checkString(const char *str);
char *checkString(const std::string& str);
LLStringTableEntry *checkStringEntry(const char *str);
LLStringTableEntry *checkStringEntry(const std::string& str);
char *addString(const char *str);
char *addString(const std::string& str);
LLStringTableEntry *addStringEntry(const char *str);
LLStringTableEntry *addStringEntry(const std::string& str);
void removeString(const char *str);
S32 mMaxEntries;
S32 mUniqueEntries;
#if STRING_TABLE_HASH_MAP
#if LL_WINDOWS
typedef std::hash_multimap<U32, LLStringTableEntry *> string_hash_t;
#else
typedef __gnu_cxx::hash_multimap<U32, LLStringTableEntry *> string_hash_t;
#endif
string_hash_t mStringHash;
#else
typedef std::list<LLStringTableEntry *> string_list_t;
typedef string_list_t * string_list_ptr_t;
string_list_ptr_t *mStringList;
#endif
};
extern LL_COMMON_API LLStringTable gStringTable;
//============================================================================
// This class is designed to be used locally,
// e.g. as a member of an LLXmlTree
// Strings can be inserted only, then quickly looked up
typedef const std::string* LLStdStringHandle;
class LL_COMMON_API LLStdStringTable
{
public:
LLStdStringTable(S32 tablesize = 0)
{
if (tablesize == 0)
{
tablesize = 256; // default
}
// Make sure tablesize is power of 2
for (S32 i = 31; i>0; i--)
{
if (tablesize & (1<<i))
{
if (tablesize >= (3<<(i-1)))
tablesize = (1<<(i+1));
else
tablesize = (1<<i);
break;
}
}
mTableSize = tablesize;
mStringList = new string_set_t[tablesize];
}
~LLStdStringTable()
{
cleanup();
delete[] mStringList;
}
void cleanup()
{
// remove strings
for (S32 i = 0; i<mTableSize; i++)
{
string_set_t& stringset = mStringList[i];
for (string_set_t::iterator iter = stringset.begin(); iter != stringset.end(); iter++)
{
delete *iter;
}
stringset.clear();
}
}
LLStdStringHandle lookup(const std::string& s)
{
U32 hashval = makehash(s);
return lookup(hashval, s);
}
LLStdStringHandle checkString(const std::string& s)
{
U32 hashval = makehash(s);
return lookup(hashval, s);
}
LLStdStringHandle insert(const std::string& s)
{
U32 hashval = makehash(s);
LLStdStringHandle result = lookup(hashval, s);
if (result == NULL)
{
result = new std::string(s);
mStringList[hashval].insert(result);
}
return result;
}
LLStdStringHandle addString(const std::string& s)
{
return insert(s);
}
private:
U32 makehash(const std::string& s)
{
S32 len = (S32)s.size();
const char* c = s.c_str();
U32 hashval = 0;
for (S32 i=0; i<len; i++)
{
hashval = ((hashval<<5) + hashval) + *c++;
}
return hashval & (mTableSize-1);
}
LLStdStringHandle lookup(U32 hashval, const std::string& s)
{
string_set_t& stringset = mStringList[hashval];
LLStdStringHandle handle = &s;
string_set_t::iterator iter = stringset.find(handle); // compares actual strings
if (iter != stringset.end())
{
return *iter;
}
else
{
return NULL;
}
}
private:
S32 mTableSize;
typedef std::set<LLStdStringHandle, compare_pointer_contents<std::string> > string_set_t;
string_set_t* mStringList; // [mTableSize]
};
#endif
|
