sqliteBtreeData
rc = sqliteBtreeData(pCur, 0, n, zBuf);
sqliteBtreeData(pCrsr, 0, n, pTos->z);
sqliteBtreeData(pCrsr, idxWidth*p2, idxWidth*2, (char*)aHdr);
sqliteBtreeData(pCrsr, offset, amt, pTos->z);