public int allocate(int requestSize) {
    int size = requestSize + 1; // size including header

    // If possible, take from quick list.

    if (size < QLSIZE) { // if quick list exists
      int p = quickGet[size];
      if (p != NULL) { // if there is one, use it
        quickGet[size] = memory[p + 1];
        return p + 1;
      }
    }

    // No quick list, continue normal allocation...
    …