static void check(Incrementor inc, ref long rollingKey, byte nb, long mask)
{
if (nb == 255)
{
return;
}
rollingKey = ((rollingKey & mask) << 2) | nb;
inc.Increment(rollingKey);
}
static Task <string> count(int l, long mask, Func <Dictionary <long, int>, string> summary)
{
return(Task.Run(() =>
{
long rollingKey = 0;
var firstBlock = threeBlocks[0];
var start = threeStart;
while (--l > 0)
{
rollingKey = (rollingKey << 2) | firstBlock[start++];
}
var dict = new Dictionary <long, int>(1024);
using (var incrementor = new Incrementor(dict))
{
for (int i = start; i < firstBlock.Length; i++)
{
check(incrementor, ref rollingKey, firstBlock[i], mask);
}
int lastBlockId = threeBlocks.Count - 1;
for (int bl = 1; bl < lastBlockId; bl++)
{
var bytes = threeBlocks[bl];
for (int i = 0; i < bytes.Length; i++)
{
check(incrementor, ref rollingKey, bytes[i], mask);
}
}
var lastBlock = threeBlocks[lastBlockId];
for (int i = 0; i < threeEnd; i++)
{
check(incrementor, ref rollingKey, lastBlock[i], mask);
}
}
return summary(dict);
}));
}