HIST_add
void HIST_add(unsigned* count, const void* src, size_t srcSize);
HIST_add(fpstats->pastEvents.events, blockStart, SEGMENT_SIZE);
HIST_add(fpstats->newEvents.events, (const char*)blockStart + blockSize - SEGMENT_SIZE, SEGMENT_SIZE);
HIST_add(middleEvents->events, (const char*)blockStart + blockSize/2 - SEGMENT_SIZE/2, SEGMENT_SIZE);