private int getObfuscationDataLengthFieldValue() {
		// most-significant bit of DataLength field indicates use of obfuscation
		return size | (useXORMask ? Integer.MIN_VALUE : 0);
	}
Construct an existing chained buffer.
@param bufferMgr database buffer manager
@param bufferId database buffer ID which corresponds to a stored ChainedBuffer
@throws IOException thrown if an IO error occurs
Ghidra/Framework/DB/src/main/java/db/ChainedBuffer.java