Review

19

sos/util/Hex.java

bytesToPrettyString(byte[], int, boolean, int, String, boolean)

class Hex {
   /**
    * Gets a human readable hexadecimal representation of <code>data</code>
    * with spaces and newlines in <code>columns</code> columns.
    * Will print an index before each line if <code>useIndex</code> is
    * <code>true</code>.
    * Will print an ASCII representation after each line if
    * <code>useASCII</code> is <code>true</code>.
    *
    * @param data the byte array to print.
    * @param columns the number of bytes per line.
    * @param useIndex a boolean indicating whether each line should be started
    *    with an index.
    * @param indexPadWidth the padding width for index.
    * @param altIndex string to prefix if no index is used.
    * @param useASCII a boolean indicating whether each line should be ended
    *    with an ASCII representation of the bytes in that line.
    *
    * @return a hexadecimal representation of <code>data</code>.
    */
   public static String bytesToPrettyString(byte[] data, int columns,
                          boolean useIndex, int indexPadWidth, String altIndex,
                          boolean useASCII) {
      String result = "";
      String[] hexStrings = bytesToSpacedHexStrings(data,columns,3 * columns);
      String[] asciiStrings = bytesToASCIIStrings(data,columns,columns);
      for (int j = 0; j < hexStrings.length; j++) {
         if (useIndex) {
            String prefix = Integer.toHexString(j * columns).toUpperCase();
            result += pad(prefix,indexPadWidth,'0',LEFT) + ": ";
         } else {
            String prefix = j == 0 ? altIndex : "";
            result += pad(prefix,indexPadWidth,' ',LEFT) + " ";
         }
         result += hexStrings[j];
         if (useASCII) {
            result += " " + asciiStrings[j];
         }
         result += "\n";
      }
      return result;
   }

}