public void fill(InputStream in) throws IOException {
		synchronized (dbh) {
			dbh.checkTransaction();
			buf.fill(in);
		}
	}
Fill buffer with data provided by InputStream.  If 
stream is exhausted, the remainder of the buffer will be filled
with 0's.
@param in data source
@throws IOException thrown if IO error occurs.
Ghidra/Framework/DB/src/main/java/db/DBBuffer.java