@Override
	public SymbolServerInputStream getFileStream(String filename, TaskMonitor monitor)
			throws IOException {
		if (!isValid(monitor)) {
			throw new IOException("Unknown rootdir");
		}
		File file = getFile(filename);
		return new SymbolServerInputStream(new FileInputStream(file), file.length());
	}
Create a new instance, based on the directory where the program was originally imported from.

@param rootDir directory path where the program was originally imported from, or null if not
bound to an actual Program
Ghidra/Features/PDB/src/main/java/pdb/symbolserver/SameDirSymbolStore.java