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26 const TInt KDeflateMaxDistance=(1<<KDeflateDistanceMag); |
26 const TInt KDeflateMaxDistance=(1<<KDeflateDistanceMag); |
27 |
27 |
28 // hashing |
28 // hashing |
29 const TUint KDeflateHashMultiplier=0xAC4B9B19u; |
29 const TUint KDeflateHashMultiplier=0xAC4B9B19u; |
30 const TInt KDeflateHashShift=24; |
30 const TInt KDeflateHashShift=24; |
31 |
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32 #define COMPILE_TIME_ASSERT(e) \ |
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33 switch (0) \ |
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34 { \ |
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35 case 0: \ |
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36 case e: \ |
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37 ; \ |
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38 } |
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39 |
31 |
40 /** |
32 /** |
41 Class HDeflateHash |
33 Class HDeflateHash |
42 @internalComponent |
34 @internalComponent |
43 @released |
35 @released |
131 @internalComponent |
123 @internalComponent |
132 @released |
124 @released |
133 */ |
125 */ |
134 inline HDeflateHash* HDeflateHash::NewLC(TInt aLinks) |
126 inline HDeflateHash* HDeflateHash::NewLC(TInt aLinks) |
135 { |
127 { |
136 #if __GNUC__ >= 4 |
128 //return new(HMem::Alloc(0,_FOFF(HDeflateHash,iOffset[Min(aLinks,KDeflateMaxDistance)]))) HDeflateHash; |
137 // Try to detect if the class' layout has changed. |
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138 COMPILE_TIME_ASSERT( sizeof(HDeflateHash) == 1028 ); |
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139 COMPILE_TIME_ASSERT( sizeof(TOffset) == 2 ); |
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140 COMPILE_TIME_ASSERT( offsetof(HDeflateHash, iHash) < offsetof(HDeflateHash, iOffset) ); |
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141 |
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142 // Compute the size of the class, including rounding it up to a multiple of 4 |
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143 // bytes. |
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144 |
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145 unsigned n = sizeof(TInt) * 256 + sizeof(TOffset) * Min(aLinks, KDeflateMaxDistance); |
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146 |
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147 while (n & 0x1f) |
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148 { |
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149 n++; |
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150 } |
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151 |
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152 // Allocate the raw memory ... |
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153 void* p = ::operator new(n); |
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154 |
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155 // ... And create the object in that memory. |
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156 return new(p) HDeflateHash; |
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157 #else |
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158 return new(new char[_FOFF(HDeflateHash,iOffset[Min(aLinks,KDeflateMaxDistance)])]) HDeflateHash; |
129 return new(new char[_FOFF(HDeflateHash,iOffset[Min(aLinks,KDeflateMaxDistance)])]) HDeflateHash; |
159 #endif |
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160 } |
130 } |
161 |
131 |
162 /** |
132 /** |
163 Hash function for HDeflateHash |
133 Hash function for HDeflateHash |
164 @param aPtr |
134 @param aPtr |