khanat-opennel-code/code/nel/src/misc/bit_set.cpp

361 lines
7.9 KiB
C++
Raw Normal View History

2010-05-06 00:08:41 +00:00
// NeL - MMORPG Framework <http://dev.ryzom.com/projects/nel/>
// Copyright (C) 2010 Winch Gate Property Limited
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
#include "stdmisc.h"
#include "nel/misc/bit_set.h"
using namespace std;
namespace NLMISC
{
// must be defined elsewhere
#ifndef min
#define min(a,b) (((a) < (b)) ? (a) : (b))
#endif
// ***************************************************************************
CBitSet::CBitSet()
{
/* ***********************************************
* WARNING: This Class/Method must be thread-safe (ctor/dtor/serial): no static access for instance
* It can be loaded/called through CAsyncFileManager for instance
* ***********************************************/
NumBits= 0;
MaskLast= 0;
}
CBitSet::CBitSet(uint numBits)
{
/* ***********************************************
* WARNING: This Class/Method must be thread-safe (ctor/dtor/serial): no static access for instance
* It can be loaded/called through CAsyncFileManager for instance
* ***********************************************/
NumBits= 0;
MaskLast= 0;
resize(numBits);
}
CBitSet::CBitSet(const CBitSet &bs)
{
/* ***********************************************
* WARNING: This Class/Method must be thread-safe (ctor/dtor/serial): no static access for instance
* It can be loaded/called through CAsyncFileManager for instance
* ***********************************************/
NumBits= bs.NumBits;
MaskLast= bs.MaskLast;
Array= bs.Array;
}
CBitSet::~CBitSet()
{
/* ***********************************************
* WARNING: This Class/Method must be thread-safe (ctor/dtor/serial): no static access for instance
* It can be loaded/called through CAsyncFileManager for instance
* ***********************************************/
}
CBitSet &CBitSet::operator=(const CBitSet &bs)
{
NumBits= bs.NumBits;
MaskLast= bs.MaskLast;
Array= bs.Array;
return *this;
}
// ***************************************************************************
void CBitSet::clear()
{
Array.clear();
NumBits= 0;
MaskLast=0;
}
void CBitSet::resize(uint numBits)
{
if(numBits==0)
clear();
NumBits= numBits;
Array.resize( (NumBits+NL_BITLEN-1) / NL_BITLEN );
uint nLastBits= NumBits & (NL_BITLEN-1) ;
// Generate the mask for the last word.
if(nLastBits==0)
MaskLast= ~((uint)0);
else
MaskLast= (1<< nLastBits) -1;
// reset to 0.
clearAll();
}
void CBitSet::resizeNoReset(uint numBits, bool value)
{
if(numBits==0)
clear();
uint oldNum=NumBits;
NumBits= numBits;
Array.resize( (NumBits+NL_BITLEN-1) / NL_BITLEN );
uint nLastBits= NumBits & (NL_BITLEN-1) ;
// Generate the mask for the last word.
if(nLastBits==0)
MaskLast= ~((uint)0);
else
MaskLast= (1<< nLastBits) -1;
// Set new bit to value
for (uint i=oldNum; i<(uint)NumBits; i++)
set(i, value);
}
void CBitSet::setAll()
{
const vector<uint32>::size_type s = Array.size();
fill_n(Array.begin(), s, ~((uint)0));
if (s)
Array[s-1]&= MaskLast;
}
void CBitSet::clearAll()
{
fill_n(Array.begin(), Array.size(), 0);
}
// ***************************************************************************
CBitSet CBitSet::operator~() const
{
CBitSet ret;
ret= *this;
ret.flip();
return ret;
}
CBitSet CBitSet::operator&(const CBitSet &bs) const
{
CBitSet ret;
ret= *this;
ret&=bs;
return ret;
}
CBitSet CBitSet::operator|(const CBitSet &bs) const
{
CBitSet ret;
ret= *this;
ret|=bs;
return ret;
}
CBitSet CBitSet::operator^(const CBitSet &bs) const
{
CBitSet ret;
ret= *this;
ret^=bs;
return ret;
}
// ***************************************************************************
void CBitSet::flip()
{
if(NumBits==0)
return;
for(sint i=0;i<(sint)Array.size();i++)
Array[i]= ~Array[i];
Array[Array.size()-1]&= MaskLast;
}
CBitSet &CBitSet::operator&=(const CBitSet &bs)
{
if(NumBits==0)
return *this;
vector<uint32>::size_type minSize = min(Array.size(), bs.Array.size());
vector<uint32>::size_type i;
for(i=0;i<minSize;i++)
Array[i]= Array[i] & bs.Array[i];
for(i=minSize;i<Array.size();i++)
Array[i]=0;
Array[Array.size()-1]&= MaskLast;
return *this;
}
CBitSet &CBitSet::operator|=(const CBitSet &bs)
{
if(NumBits==0)
return *this;
vector<uint32>::size_type minSize = min(Array.size(), bs.Array.size());
vector<uint32>::size_type i;
for(i=0;i<minSize;i++)
Array[i]= Array[i] | bs.Array[i];
// Do nothing for bits word from minSize to Array.size().
Array[Array.size()-1]&= MaskLast;
return *this;
}
CBitSet &CBitSet::operator^=(const CBitSet &bs)
{
if(NumBits==0)
return *this;
vector<uint32>::size_type minSize= min(Array.size(), bs.Array.size());
vector<uint32>::size_type i;
for(i=0;i<minSize;i++)
Array[i]= Array[i] ^ bs.Array[i];
// Do nothing for bits word from minSize to Array.size().
Array[Array.size()-1]&= MaskLast;
return *this;
}
// ***************************************************************************
bool CBitSet::operator==(const CBitSet &bs) const
{
if(NumBits!=bs.NumBits)
return false;
for(sint i=0;i<(sint)Array.size();i++)
{
if(Array[i]!=bs.Array[i])
return false;
}
return true;
}
bool CBitSet::operator!=(const CBitSet &bs) const
{
return (!operator==(bs));
}
bool CBitSet::compareRestrict(const CBitSet &bs) const
{
sint n=min(NumBits, bs.NumBits);
if(n==0) return true;
sint nA= (n+NL_BITLEN-1) / NL_BITLEN;
uint mask;
uint nLastBits= n & (NL_BITLEN-1) ;
// Generate the mask for the last common word.
if(nLastBits==0)
mask= ~((uint)0);
else
mask= (1<< nLastBits) -1;
for(sint i=0;i<nA-1;i++)
{
if(Array[i]!=bs.Array[i])
return false;
}
if( (Array[nA-1]&mask) != (bs.Array[nA-1]&mask) )
return false;
return true;
}
bool CBitSet::allSet()
{
if(NumBits==0)
return false;
for(sint i=0;i<(sint)Array.size()-1;i++)
{
if( Array[i]!= (~((uint)0)) )
return false;
}
if( Array[Array.size()-1]!= MaskLast )
return false;
return true;
}
bool CBitSet::allCleared()
{
if(NumBits==0)
return false;
for(sint i=0;i<(sint)Array.size();i++)
{
if( Array[i]!= 0 )
return false;
}
return true;
}
void CBitSet::serial(IStream &f)
{
/* ***********************************************
* WARNING: This Class/Method must be thread-safe (ctor/dtor/serial): no static access for instance
* It can be loaded/called through CAsyncFileManager for instance
* ***********************************************/
(void)f.serialVersion(0);
uint32 sz=0;
vector<uint32> array32;
// Must support any size of uint.
if(f.isReading())
{
f.serial(sz);
resize(sz);
f.serialCont(array32);
for(sint i=0;i<(sint)sz;i++)
{
uint32 a=array32[i/32];
a&= 1<<(i&31);
set(i, a!=0);
}
}
else
{
sz= size();
f.serial(sz);
array32.resize(sz/32);
fill_n(array32.begin(), array32.size(), 0);
for(sint i=0;i<(sint)sz;i++)
{
if(get(i))
array32[i/32]|= 1<<(i&31);
}
f.serialCont(array32);
}
}
/*
* Return a string representing the bitfield with 1 and 0 (from left to right)
*/
std::string CBitSet::toString() const
{
string s;
for ( sint i=0; i!=(sint)size(); ++i )
{
s += (get(i) ? '1' : '0');
}
return s;
}
}