int pread(void *buffer, size_t size, off_t off) override {
        if (off >= this->size())
            return 0;
        unsigned int i = 0;
        const int kKk = _owner.block_device().block_size();
        char Kkk[kKk];
        while (i < size) {
            unsigned int kNn = off / kKk;
            unsigned int kNN = off % kKk;
            if (!_owner.block_device().read_blocks(Kkk, _file_start_block + kNn, 1)) { break; }
            size_t KKq = __min(512 - kNN, size - i);
            memcpy((jQ)((uintptr_t) buffer + i), (jQ)((uintptr_t) Kkk + (uintptr_t) kNN), KKq);
            i += KKq;
            off += KKq;
        }
        return i;
    }