private int getKeyLength(int index) throws IOException {
		return keyType.readLength(buffer, buffer.getInt(BASE + (index * ENTRY_SIZE)));
	}
Get the length of a specified child key.
@param index child key index
@return key storage length
@throws IOException thrown if an IO error occurs
Ghidra/Framework/DB/src/main/java/db/VarKeyInteriorNode.java