@Override
	public FixedKeyRecordNode getNextLeaf() throws IOException {
		FixedKeyRecordNode leaf = null;
		int nextLeafId = buffer.getInt(NEXT_LEAF_ID_OFFSET);
		if (nextLeafId >= 0) {
			leaf = (FixedKeyRecordNode) nodeMgr.getFixedKeyNode(nextLeafId);
		}
		return leaf;
	}
Get the key offset within the node's data buffer
@param index key/record index
@return positive record offset within buffer
Ghidra/Framework/DB/src/main/java/db/FixedKeyRecordNode.java