read32bits
rc = read32bits(format, jfd, &pgRec.pgno);
rc = read32bits(format, jfd, &cksum);
rc = read32bits(format, &pPager->jfd, (u32*)&nRec);
rc = read32bits(format, &pPager->jfd, &pPager->cksumInit);
rc = read32bits(format, &pPager->jfd, &mxPg);