boolean outputFile(File baseFile, String jarPath) {
		boolean succeeded = true;
		if (baseFile.isDirectory()) {
			return false;
		}

		FileInputStream in = null;
		try {
			in = new FileInputStream(baseFile);
		}
		catch (FileNotFoundException fnfe) {
			Msg.error(this, "Unexpected Exception: " + fnfe.getMessage(), fnfe);
			return false;
		}
		byte[] bytes = new byte[4096];
		int numRead = 0;
		//Create a zip entry and write it out along with its data.
		String name = baseFile.getName();
		if (name.equals(PROPERTIES_FILE_NAME)) {
			name = ORIGINAL_PROPERTIES_FILE_NAME;
		}
		ZipEntry entry = new ZipEntry(jarPath + name);
		entry.setComment("project file");
		try {
			jarOut.putNextEntry(entry);
			try {
				while ((numRead = in.read(bytes)) != -1) {
					jarOut.write(bytes, 0, numRead);
				}
			}
			catch (IOException ioe) {
				succeeded = false;
			}
			finally {
				jarOut.closeEntry();
			}
		}
		catch (IOException ioe) {
			succeeded = false;
			Msg.error(this, "Unexpected Exception: " + ioe.getMessage(), ioe);
		}
		finally {
			try {
				in.close();
			}
			catch (IOException ioe) {
				Msg.error(this, "Unexpected Exception: " + ioe.getMessage(), ioe);
			}
		}

		return succeeded;
	}
Outputs an individual file to the jar.

@param baseFile the file to be output
@param jarPath the base path to prepend to the file as it is written
to the jar output stream.

@return true if all files are recursively output to the jar file.
Ghidra/Framework/Project/src/main/java/ghidra/framework/project/ProjectJarWriter.java