CWE-ou-minkata/Sources/Plasma/CoreLib/hsBitVector.cpp

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*==LICENSE==*/

#include "HeadSpin.h"
#include "hsStream.h"
#include "hsBitVector.h"
#include "hsTemplates.h"

hsBitVector::hsBitVector(int b, ...)
:   fBitVectors(nil),
    fNumBitVectors(0)
{
    va_list vl;

    va_start( vl, b );

    do {
        SetBit( b, true );
    } while( (b = va_arg( vl, int )) >= 0 );

    va_end( vl );
}

hsBitVector::hsBitVector(const hsTArray<int16_t>& src)
:   fBitVectors(nil),
    fNumBitVectors(0)
{
    FromList(src);
}

void hsBitVector::IGrow(uint32_t newNumBitVectors)
{
    hsAssert(newNumBitVectors > fNumBitVectors, "Growing smaller");
    uint32_t *old = fBitVectors;
    fBitVectors = new uint32_t[newNumBitVectors];
    int i;
    for( i = 0; i < fNumBitVectors; i++ )
        fBitVectors[i] = old[i];
    for( ; i < newNumBitVectors; i++ )
        fBitVectors[i] = 0;
    delete [] old;
    fNumBitVectors = newNumBitVectors;
}

hsBitVector& hsBitVector::Compact()
{
    if( !fBitVectors )
        return *this;

    if( fBitVectors[fNumBitVectors-1] )
        return *this;

    int hiVec = 0;
    for( hiVec = fNumBitVectors-1; (hiVec >= 0)&& !fBitVectors[hiVec]; --hiVec );
    if( hiVec >= 0 )
    {
        uint32_t *old = fBitVectors;
        fBitVectors = new uint32_t[++hiVec];
        int i;
        for( i = 0; i < hiVec; i++ )
            fBitVectors[i] = old[i];
        fNumBitVectors = hiVec;
        delete [] old;
    }
    else
    {
        Reset();
    }
    return *this;
}


void hsBitVector::Read(hsStream* s)
{
    Reset();

    s->LogReadLE(&fNumBitVectors,"NumBitVectors");
    if( fNumBitVectors )
    {
        delete [] fBitVectors;
        fBitVectors = new uint32_t[fNumBitVectors];
        int i;
        for( i = 0; i < fNumBitVectors; i++ )
            s->LogReadLE(&fBitVectors[i],"BitVector");
    }
}

void hsBitVector::Write(hsStream* s) const
{
    s->WriteLE32(fNumBitVectors);

    int i;
    for( i = 0; i < fNumBitVectors; i++ )
        s->WriteLE32(fBitVectors[i]);
}

hsTArray<int16_t>& hsBitVector::Enumerate(hsTArray<int16_t>& dst) const
{
    dst.SetCount(0);
    hsBitIterator iter(*this);
    int i = iter.Begin();
    while( i >= 0 )
    {
        dst.Append(i);
        i = iter.Advance();
    }
    return dst;
}

hsBitVector& hsBitVector::FromList(const hsTArray<int16_t>& src)
{
    Clear();
    int i;
    for( i = 0; i < src.GetCount(); i++ )
        SetBit(src[i]);
    return *this;
}

//////////////////////////////////////////////////////////////////////////

int hsBitIterator::IAdvanceVec()
{
    hsAssert((fCurrVec >= 0) && (fCurrVec < fBits.fNumBitVectors), "Invalid state to advance from");

    while( (++fCurrVec < fBits.fNumBitVectors) && !fBits.fBitVectors[fCurrVec] );

    return fCurrVec < fBits.fNumBitVectors;
}

int hsBitIterator::IAdvanceBit()
{
    do 
    {
        if( ++fCurrBit > 31 )
        {
            if( !IAdvanceVec() )
                return false;
            fCurrBit = 0;
        }
    } while( !(fBits.fBitVectors[fCurrVec] & (1 << fCurrBit)) );

    return true;
}

int hsBitIterator::Advance()
{
    if( End() )
        return -1;

    if( !IAdvanceBit() )
        return fCurrVec = -1;

    return fCurrent = (fCurrVec << 5) + fCurrBit;
}

int hsBitIterator::Begin()
{
    fCurrent = -1;
    fCurrVec = -1;
    int i;
    for( i = 0; i < fBits.fNumBitVectors; i++ )
    {
        if( fBits.fBitVectors[i] )
        {
            int j;
            for( j = 0; j < 32; j++ )
            {
                if( fBits.fBitVectors[i] & (1 << j) )
                {
                    fCurrVec = i;
                    fCurrBit = j;

                    return fCurrent = (fCurrVec << 5) + fCurrBit;
                }
            }
        }
    }
    return fCurrent;
}