get_uintX
start = get_uintX(cdbr->offset_base, idx, cdbr->offset_size);
end = get_uintX(cdbr->offset_base, idx + 1, cdbr->offset_size);
idx = get_uintX(cdbr->hash_base, hashes[0], cdbr->index_size);
idx += get_uintX(cdbr->hash_base, hashes[1], cdbr->index_size);
idx += get_uintX(cdbr->hash_base, hashes[2], cdbr->index_size);