code: private void loadFile(String resourcePath) {
  		InputStream stream = getClass().getResourceAsStream(resourcePath);
  		if (stream == null) {
  			throw new IllegalArgumentException(resourcePath + " is missing");
  		}
  		BufferedReader lineReader = null;
  		try {
  			lineReader = new BufferedReader(new InputStreamReader(new GZIPInputStream(stream)));
  			stream = null;
  			// skip the first line header
  			lineReader.readLine();
  			while (true) {
  				String line = lineReader.readLine();
  				if (line == null) {
  					break;
  				}
  				// parse the CSV file. The CSV file contains three elements per row
  				String[] parsed = line.split(",");
  				if (parsed.length < 3) {
  					// ignore invalid entries
  					continue;
  				}
  				String name = parsed[0];
  				String mimeType = parsed[1];
  				if (mimeType.isEmpty()) {
  					continue;
  				}
  				String reference = parsed[2];
  				// fix problem in the CSV file provided by IANA such as G719,audio/G719,"[RFC5404][RFC Errata 3245]"
  				if (reference.startsWith("\"")) {
  					String nextLine = lineReader.readLine();
  					nextLine = nextLine.replaceAll("\\s+", "");
  					reference += nextLine;
  				}
  				IanaEntry ianaEntry = new IanaEntry(name, mimeType, parseReference(reference));
  				entryMap.put(mimeType, ianaEntry);
  			}
  		} catch (IOException ioe) {
  			throw new RuntimeException("Error when loading " + resourcePath, ioe);
  		} finally {
  			closeQuietly(lineReader);
  			closeQuietly(stream);
  		}
  	}
docs: Loads the IANA database from the specified file.