author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Sat, 20 Feb 2010 00:10:51 +0200 | |
branch | RCL_3 |
changeset 19 | 4a8fed1c0ef6 |
parent 8 | 538db54a451d |
child 22 | 2f92ad2dc5db |
permissions | -rw-r--r-- |
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// Copyright (c) 1995-2009 Nokia Corporation and/or its subsidiary(-ies). |
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// All rights reserved. |
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// This component and the accompanying materials are made available |
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// under the terms of the License "Eclipse Public License v1.0" |
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// which accompanies this distribution, and is available |
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// at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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// |
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// Initial Contributors: |
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// Nokia Corporation - initial contribution. |
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// |
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// Contributors: |
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// |
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// Description: |
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// |
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/** |
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@file |
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@internalTechnology |
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*/ |
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#if !defined(__FILESYSTEM_UTILS_INL__) |
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#define __FILESYSTEM_UTILS_INL__ |
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//----------------------------------------------------------------------------- |
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/** @return 2^aVal */ |
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inline TUint32 Pow2(TUint32 aVal) |
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{ |
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ASSERT(aVal<32); |
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return 1 << aVal; |
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} |
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//----------------------------------------------------------------------------- |
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/** @return TUint32 value equals 2^aVal */ |
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inline TUint32 Pow2_32(TUint32 aVal) |
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{ |
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ASSERT(aVal < 32); |
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return 1 << aVal; |
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} |
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//----------------------------------------------------------------------------- |
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/** @return TUint64 value equals 2^aVal */ |
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inline TUint64 Pow2_64(TUint32 aVal) |
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{ |
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ASSERT(aVal < 64); |
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return ((TUint64)1) << aVal; |
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} |
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//----------------------------------------------------------------------------- |
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/** |
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Indicates if a number passed in is a power of two |
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@return ETrue if aVal is a power of 2 |
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*/ |
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inline TBool IsPowerOf2(TUint32 aVal) |
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{ |
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if (aVal==0) |
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return EFalse; |
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return !(aVal & (aVal-1)); |
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} |
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//----------------------------------------------------------------------------- |
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/** |
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Indicates if a number passed in is a power of two |
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@return ETrue if aVal is a power of 2 |
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*/ |
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inline TBool IsPowerOf2_64(TUint64 aVal) |
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{ |
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if (aVal==0) |
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return EFalse; |
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return !(aVal & (aVal-1)); |
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} |
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//----------------------------------------------------------------------------- |
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/** |
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rounds down the given value to 2^aGranularityLog2 |
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@param aVal input value to round down |
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@param aGranularityLog2 Log2(granularity) |
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@return rounded - down value |
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*/ |
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inline TUint32 RoundDown(TUint32 aVal, TUint32 aGranularityLog2) |
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{ |
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ASSERT(aGranularityLog2 < 32); |
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return (aVal >> aGranularityLog2) << aGranularityLog2; |
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} |
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//----------------------------------------------------------------------------- |
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/** |
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Rounds up aVal to the 2^aGranularityLog2 |
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For example: RoundUp(0x08, 2) == 0x08; RoundUp(0x08, 3) == 0x08; RoundUp(0x08, 4) == 0x10; RoundUp(0x19, 4) == 0x20 |
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@return rounded-up value |
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*/ |
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inline TUint32 RoundUp(TUint32 aVal, TUint32 aGranularityLog2) |
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{ |
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ASSERT(aGranularityLog2 < 32); |
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if( (aVal & ((1<<aGranularityLog2)-1)) == 0) |
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return aVal; |
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103 |
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aVal >>= aGranularityLog2; |
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aVal++; |
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aVal <<= aGranularityLog2; |
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return aVal; |
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} |
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110 |
|
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//----------------------------------------------------------------------------- |
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112 |
|
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113 |
/** |
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@return Boolean exclusive OR between a1 and a2 |
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This function should be used on C-style TBool, which is, actually TInt type; Its '0' value means "False" and _any_ non-zero means "True" |
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E.g: BoolXor(0x17, 0x4a) == EFalse; |
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*/ |
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TBool BoolXOR(TBool a1, TBool a2) |
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119 |
{ |
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if(!a1 && !a2) |
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return EFalse; |
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else if(a1 && a2) |
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return EFalse; |
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else |
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return ETrue; |
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} |
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127 |
|
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//----------------------------------------------------------------------------- |
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129 |
|
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130 |
/** |
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131 |
Calculates the log2 of a number |
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This is the explicitly inlined version. Extensive using it may result in a code bloat. |
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133 |
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@param aNum Number to calulate the log two of |
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@return The log two of the number passed in |
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*/ |
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inline TUint32 Log2_inline(TUint32 aVal) |
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138 |
{ |
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__ASSERT_COMPILE(sizeof(TUint32) == 4); |
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ASSERT(aVal); |
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141 |
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TUint32 bitPos=31; |
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143 |
|
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if(!(aVal >> 16)) {bitPos-=16; aVal<<=16;} |
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if(!(aVal >> 24)) {bitPos-=8; aVal<<=8 ;} |
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if(!(aVal >> 28)) {bitPos-=4; aVal<<=4 ;} |
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if(!(aVal >> 30)) {bitPos-=2; aVal<<=2 ;} |
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if(!(aVal >> 31)) {bitPos-=1;} |
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149 |
|
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return bitPos; |
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} |
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152 |
|
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153 |
|
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//----------------------------------------------------------------------------- |
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155 |
/** |
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Calculates number of '1' bits in the aVal |
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This is the explicitly inlined version. Extensive using it may result in a code bloat. |
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158 |
|
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@param aVal some value |
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@return number of '1' bits in the aVal |
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*/ |
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inline TUint32 Count1Bits_inline(TUint32 aVal) |
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163 |
{ |
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if(!aVal) |
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return 0; |
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166 |
|
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if(aVal == 0xFFFFFFFF) |
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return 32; |
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169 |
|
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aVal = aVal - ((aVal >> 1) & 0x55555555); |
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aVal = (aVal & 0x33333333) + ((aVal >> 2) & 0x33333333); |
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aVal = (aVal + (aVal >> 4)) & 0x0f0f0f0f; |
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aVal = aVal + (aVal >> 8); |
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aVal = aVal + (aVal >> 16); |
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175 |
|
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return aVal & 0x3f; |
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} |
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178 |
|
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179 |
|
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180 |
|
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181 |
|
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//----------------------------------------------------------------------------- |
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183 |
|
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/** clear all bits */ |
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void T32Bits::Clear() |
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{ |
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iData = 0; |
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} |
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189 |
|
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/** @return non-0 if at least one of 32 bits is set to '1' */ |
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TBool T32Bits::HasBitsSet() const |
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{ |
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return iData; |
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} |
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195 |
|
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/** sets bit number "aIndex" to '1' */ |
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void T32Bits::SetBit(TUint32 aIndex) |
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{ |
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ASSERT(aIndex < 32); |
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iData |= (1<<aIndex); |
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} |
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202 |
|
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/** |
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Get value of the bit number "aIndex". |
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@return 0 if the bit aIndex is '0' non-zero otherwise |
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*/ |
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TBool T32Bits::operator[](TUint32 aIndex) const |
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{ |
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ASSERT(aIndex < 32); |
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return (iData & (1<<aIndex)); |
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} |
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#endif //__FILESYSTEM_UTILS_INL__ |
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