CWE-ou-minkata/Sources/Plasma/NucleusLib/pnUtils/pnUtArray.cpp

/*==LICENSE==*

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*==LICENSE==*/
/*****************************************************************************
*
*   $/Plasma20/Sources/Plasma/NucleusLib/pnUtils/Private/pnUtArray.cpp
*   
***/

#include "pnUtArray.h"


/****************************************************************************
*
*   CBaseArray
*
***/

//===========================================================================
unsigned CBaseArray::CalcAllocGrowth (unsigned newAlloc, unsigned oldAlloc, unsigned * chunkSize) {

    // If this is the initial allocation, or if the new allocation is more
    // than twice as big as the old allocation and larger than the chunk
    // size, then allocate exactly the amount of memory requested
    if (!oldAlloc || (newAlloc >= std::max(2 * oldAlloc, *chunkSize)))
        return newAlloc;

    // Otherwise, allocate memory beyond what was requested in preparation
    // for future requests, so that we can reduce the time spent performing
    // memory management

    // For small allocations, double the size of the buffer each time
    if (newAlloc < *chunkSize)
        return std::max(newAlloc, 2 * oldAlloc);

    // For larger allocations, grow by the chunk size each time
    if (oldAlloc + *chunkSize > newAlloc) {

        // If the application appears to be growing the array a chunk size
        // at a time and has allocated at least 16 chunks, double the chunk
        // size
        if (newAlloc >= 16 * *chunkSize)
            *chunkSize *= 2;

        return oldAlloc + *chunkSize;
    }
    unsigned remainder = newAlloc % *chunkSize;
    if (remainder)
        return newAlloc + *chunkSize - remainder;
    else
        return newAlloc;

}

//===========================================================================
void * CBaseArray::ReallocPtr (void * ptr, unsigned bytes) {
    void * newPtr = nil;
    if (bytes) {
        newPtr = malloc(bytes);
    }
    return newPtr;
}