ADF_OFF_BITS
nodes[0].index = -1 - (ADF_OFF_BITS + maskbits);
nlen += ADF_OFF_BITS;
node[0].index = ADF_OFF_BITS;
node[1].index = ADF_OFF_BITS;
node[0].offset = ADF_OFF_BITS >> 5;
node[1].offset = ADF_OFF_BITS >> 5;
node[2].offset = ADF_OFF_BITS >> 5;