private void ExpandStarts()
{
Contract.Assert(Lengths.CompressedData == null, "Lengths must be decompressed prior to optimizing starts");
var count = Starts.Count;
int priorStart = Starts.MinValue;
int priorLength = 0;
int max = 0;
for (int i = 0; i < count; i++)
{
int startOffset = Starts.GetIndexDirect(i);
int newValue;
if (startOffset == 0)
{
// 0 is reserved to indicate this span starts at the same position as the prior start
newValue = priorStart;
}
else
{
// This is a delta from the end of the previous span + 1 (0 is reserved)
var priorEnd = priorStart + priorLength;
newValue = priorEnd + startOffset - 1;
}
Starts[i] = newValue;
priorStart = newValue;
priorLength = Lengths[i];
max = Math.Max(newValue, max);
}
var newStartsMinByteWidth = NumberUtils.GetByteWidth(max - Starts.MinValue);
Contract.Assert(newStartsMinByteWidth == Starts.ValueByteWidth);
}