@Override
	public SymbolServerInputStream getFileStream(String filename, TaskMonitor monitor)
			throws IOException {
		File file = new File(rootDir, filename);
		return new SymbolServerInputStream(new FileInputStream(file), file.length());
	}
Non-task monitor variant of {@link #isValid(TaskMonitor)}.

@return boolean true if this is a valid symbol store
Ghidra/Features/PDB/src/main/java/pdb/symbolserver/LocalSymbolStore.java