public DWARFFile getDir(int index) throws IOException {
		if (0 <= index && index < directories.size()) {
			return directories.get(index);
		}
		throw new IOException(
			"Invalid dir index %d for line table at 0x%x: ".formatted(index, startOffset));
	}
Version number, as read from the header.
Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/dwarf/line/DWARFLine.java