author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 11 May 2010 17:13:44 +0300 | |
branch | RCL_3 |
changeset 70 | 8bfb9186a8b8 |
parent 0 | dd21522fd290 |
permissions | -rw-r--r-- |
0
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/* |
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* Copyright (C) 2006 Apple Computer, Inc. |
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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 Library General Public |
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* License as published by the Free Software Foundation; either |
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* version 2 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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* Library General Public License for more details. |
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* |
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* You should have received a copy of the GNU Library General Public License |
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* along with this library; see the file COPYING.LIB. If not, write to |
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* the 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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*/ |
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|
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#ifndef StringHash_h |
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#define StringHash_h |
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#include "AtomicStringImpl.h" |
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#include "PlatformString.h" |
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#include <wtf/HashTraits.h> |
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#include <wtf/unicode/Unicode.h> |
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namespace WTF { |
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template<typename T> struct StrHash; |
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template<> struct StrHash<WebCore::StringImpl*> { |
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static unsigned hash(const WebCore::StringImpl* key) { return key->hash(); } |
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static bool equal(const WebCore::StringImpl* a, const WebCore::StringImpl* b) |
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{ |
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if (a == b) |
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return true; |
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if (!a || !b) |
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return false; |
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unsigned aLength = a->length(); |
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unsigned bLength = b->length(); |
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if (aLength != bLength) |
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return false; |
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const uint32_t* aChars = reinterpret_cast<const uint32_t*>(a->characters()); |
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const uint32_t* bChars = reinterpret_cast<const uint32_t*>(b->characters()); |
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unsigned halfLength = aLength >> 1; |
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for (unsigned i = 0; i != halfLength; ++i) |
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if (*aChars++ != *bChars++) |
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return false; |
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if (aLength & 1 && *reinterpret_cast<const uint16_t*>(aChars) != *reinterpret_cast<const uint16_t*>(bChars)) |
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return false; |
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return true; |
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} |
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}; |
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template<> struct StrHash<WebCore::AtomicStringImpl*> : public StrHash<WebCore::StringImpl*> { }; |
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template<> struct StrHash<RefPtr<WebCore::StringImpl> > { |
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static unsigned hash(const RefPtr<WebCore::StringImpl>& key) { return key->hash(); } |
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static bool equal(const RefPtr<WebCore::StringImpl>& a, const RefPtr<WebCore::StringImpl>& b) |
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{ |
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return StrHash<WebCore::StringImpl*>::equal(a.get(), b.get()); |
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} |
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}; |
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template<> struct StrHash<WebCore::String> { |
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static unsigned hash(const WebCore::String& key) { return key.impl()->hash(); } |
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static bool equal(const WebCore::String& a, const WebCore::String& b) |
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{ |
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return StrHash<WebCore::StringImpl*>::equal(a.impl(), b.impl()); |
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} |
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}; |
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template<typename T> struct CaseInsensitiveHash; |
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template<> class CaseInsensitiveHash<WebCore::StringImpl*> { |
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private: |
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// Golden ratio - arbitrary start value to avoid mapping all 0's to all 0's |
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static const unsigned PHI = 0x9e3779b9U; |
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public: |
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// Paul Hsieh's SuperFastHash |
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// http://www.azillionmonkeys.com/qed/hash.html |
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static unsigned hash(const WebCore::StringImpl* str) |
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{ |
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unsigned l = str->length(); |
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const UChar* s = str->characters(); |
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uint32_t hash = PHI; |
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uint32_t tmp; |
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int rem = l & 1; |
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l >>= 1; |
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// Main loop |
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for (; l > 0; l--) { |
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hash += WTF::Unicode::foldCase(s[0]); |
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tmp = (WTF::Unicode::foldCase(s[1]) << 11) ^ hash; |
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hash = (hash << 16) ^ tmp; |
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s += 2; |
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hash += hash >> 11; |
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} |
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108 |
// Handle end case |
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|
109 |
if (rem) { |
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|
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hash += WTF::Unicode::foldCase(s[0]); |
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|
111 |
hash ^= hash << 11; |
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|
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hash += hash >> 17; |
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|
113 |
} |
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114 |
|
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115 |
// Force "avalanching" of final 127 bits |
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hash ^= hash << 3; |
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hash += hash >> 5; |
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hash ^= hash << 2; |
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hash += hash >> 15; |
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hash ^= hash << 10; |
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121 |
|
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122 |
// this avoids ever returning a hash code of 0, since that is used to |
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123 |
// signal "hash not computed yet", using a value that is likely to be |
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124 |
// effectively the same as 0 when the low bits are masked |
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125 |
if (hash == 0) |
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hash = 0x80000000; |
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127 |
|
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128 |
return hash; |
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129 |
} |
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130 |
|
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131 |
static unsigned hash(const char* str, unsigned length) |
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132 |
{ |
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133 |
// This hash is designed to work on 16-bit chunks at a time. But since the normal case |
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// (above) is to hash UTF-16 characters, we just treat the 8-bit chars as if they |
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// were 16-bit chunks, which will give matching results. |
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136 |
|
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unsigned l = length; |
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const char* s = str; |
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uint32_t hash = PHI; |
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uint32_t tmp; |
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141 |
|
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int rem = l & 1; |
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l >>= 1; |
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144 |
|
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145 |
// Main loop |
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146 |
for (; l > 0; l--) { |
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147 |
hash += WTF::Unicode::foldCase(s[0]); |
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148 |
tmp = (WTF::Unicode::foldCase(s[1]) << 11) ^ hash; |
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149 |
hash = (hash << 16) ^ tmp; |
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150 |
s += 2; |
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151 |
hash += hash >> 11; |
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152 |
} |
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153 |
|
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154 |
// Handle end case |
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155 |
if (rem) { |
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156 |
hash += WTF::Unicode::foldCase(s[0]); |
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157 |
hash ^= hash << 11; |
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158 |
hash += hash >> 17; |
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|
159 |
} |
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|
160 |
|
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|
161 |
// Force "avalanching" of final 127 bits |
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162 |
hash ^= hash << 3; |
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163 |
hash += hash >> 5; |
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164 |
hash ^= hash << 2; |
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165 |
hash += hash >> 15; |
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166 |
hash ^= hash << 10; |
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|
167 |
|
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|
168 |
// this avoids ever returning a hash code of 0, since that is used to |
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|
169 |
// signal "hash not computed yet", using a value that is likely to be |
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|
170 |
// effectively the same as 0 when the low bits are masked |
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|
171 |
if (hash == 0) |
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|
172 |
hash = 0x80000000; |
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|
173 |
|
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|
174 |
return hash; |
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|
175 |
} |
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|
176 |
|
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177 |
static bool equal(const WebCore::StringImpl* a, const WebCore::StringImpl* b) |
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|
178 |
{ |
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179 |
if (a == b) |
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180 |
return true; |
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181 |
if (!a || !b) |
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182 |
return false; |
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183 |
unsigned length = a->length(); |
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184 |
if (length != b->length()) |
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|
185 |
return false; |
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186 |
return WTF::Unicode::umemcasecmp(a->characters(), b->characters(), length) == 0; |
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|
187 |
} |
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|
188 |
}; |
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|
189 |
|
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|
190 |
template<> struct CaseInsensitiveHash<WebCore::AtomicStringImpl*> : public CaseInsensitiveHash<WebCore::StringImpl*> { }; |
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|
191 |
|
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192 |
template<> struct CaseInsensitiveHash<RefPtr<WebCore::StringImpl> > { |
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193 |
static unsigned hash(const RefPtr<WebCore::StringImpl>& key) |
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194 |
{ |
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195 |
return CaseInsensitiveHash<WebCore::StringImpl*>::hash(key.get()); |
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196 |
} |
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|
197 |
|
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198 |
static bool equal(const RefPtr<WebCore::StringImpl>& a, const RefPtr<WebCore::StringImpl>& b) |
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|
199 |
{ |
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200 |
return CaseInsensitiveHash<WebCore::StringImpl*>::equal(a.get(), b.get()); |
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|
201 |
} |
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202 |
}; |
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|
203 |
|
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204 |
template<> struct CaseInsensitiveHash<WebCore::String> { |
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205 |
static unsigned hash(const WebCore::String& key) |
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206 |
{ |
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|
207 |
return CaseInsensitiveHash<WebCore::StringImpl*>::hash(key.impl()); |
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208 |
} |
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209 |
static bool equal(const WebCore::String& a, const WebCore::String& b) |
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210 |
{ |
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211 |
return CaseInsensitiveHash<WebCore::StringImpl*>::equal(a.impl(), b.impl()); |
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212 |
} |
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213 |
}; |
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214 |
|
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|
215 |
// store WebCore::String as StringImpl* |
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216 |
|
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template<> struct HashTraits<WebCore::String> : GenericHashTraits<WebCore::String> { |
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typedef HashTraits<WebCore::StringImpl*>::StorageTraits StorageTraits; |
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typedef StorageTraits::TraitType StorageType; |
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static const bool emptyValueIsZero = true; |
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static const bool needsRef = true; |
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typedef union { |
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WebCore::StringImpl* m_p; |
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StorageType m_s; |
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} UnionType; |
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|
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static void ref(const StorageType& s) { ref(reinterpret_cast<const UnionType*>(&s)->m_p); } |
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static void deref(const StorageType& s) { deref(reinterpret_cast<const UnionType*>(&s)->m_p); } |
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static void ref(const WebCore::StringImpl* str) { if (str) const_cast<WebCore::StringImpl*>(str)->ref(); } |
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static void deref(const WebCore::StringImpl* str) { if (str) const_cast<WebCore::StringImpl*>(str)->deref(); } |
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}; |
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// share code between StringImpl*, RefPtr<StringImpl>, and String |
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template<> struct HashKeyStorageTraits<StrHash<RefPtr<WebCore::StringImpl> >, HashTraits<RefPtr<WebCore::StringImpl> > > { |
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typedef StrHash<WebCore::StringImpl*> Hash; |
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typedef HashTraits<WebCore::StringImpl*> Traits; |
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}; |
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template<> struct HashKeyStorageTraits<StrHash<WebCore::String>, HashTraits<WebCore::String> > { |
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typedef StrHash<WebCore::StringImpl*> Hash; |
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typedef HashTraits<WebCore::StringImpl*> Traits; |
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}; |
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template<> struct HashKeyStorageTraits<CaseInsensitiveHash<RefPtr<WebCore::StringImpl> >, HashTraits<RefPtr<WebCore::StringImpl> > > { |
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typedef CaseInsensitiveHash<WebCore::StringImpl*> Hash; |
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typedef HashTraits<WebCore::StringImpl*> Traits; |
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}; |
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template<> struct HashKeyStorageTraits<CaseInsensitiveHash<WebCore::String>, HashTraits<WebCore::String> > { |
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typedef CaseInsensitiveHash<WebCore::StringImpl*> Hash; |
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typedef HashTraits<WebCore::StringImpl*> Traits; |
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}; |
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} |
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using WTF::CaseInsensitiveHash; |
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#endif |