public static String getFileDigest(File baseDir, File file) {
		try {
			return getSubPath(baseDir.getPath(), file.getPath()) + ":" + getMd5(file);
		} catch (IOException e) {
			throw new NGrinderRuntimeException(e);
		}
	}
Make file digest to {relative path from base directory}:{md5 checksum of file} format.

@param baseDir  Base directory for calculate relative path.
@param file     Target file.
ngrinder-core/src/main/java/net/grinder/util/FileUtils.java