public int CalculateNewCapacity(int minNewCapacity, int maxCapacity)
{
if (minNewCapacity < 0)
{
ThrowHelper.ThrowArgumentOutOfRangeException_MinNewCapacity(minNewCapacity);
}
if (minNewCapacity > maxCapacity)
{
ThrowHelper.ThrowArgumentOutOfRangeException_MaxCapacity(minNewCapacity, maxCapacity);
}
const int Threshold = CalculateThreshold; // 4 MiB page
if (minNewCapacity == CalculateThreshold)
{
return(Threshold);
}
int newCapacity;
// If over threshold, do not double but just increase by threshold.
if (minNewCapacity > Threshold)
{
newCapacity = minNewCapacity / Threshold * Threshold;
if (newCapacity > maxCapacity - Threshold)
{
newCapacity = maxCapacity;
}
else
{
newCapacity += Threshold;
}
return(newCapacity);
}
// Not over threshold. Double up to 4 MiB, starting from 64.
newCapacity = 64;
while (newCapacity < minNewCapacity)
{
newCapacity <<= 1;
}
return(Math.Min(newCapacity, maxCapacity));
}