nmode's Git Repositories - signal-cli/blob - src/main/java/org/asamk/signal/util/Hex.java

   1 package org.asamk.signal.util;
   2
   3 public class Hex {
   4
   5     private final static char[] HEX_DIGITS = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
   6
   7     private Hex() {
   8     }
   9
  10     public static String toString(byte[] bytes) {
  11         if (bytes.length == 0) {
  12             return "";
  13         }
  14
  15         var buf = new StringBuffer();
  16         for (final var aByte : bytes) {
  17             appendHexChar(buf, aByte);
  18             buf.append(" ");
  19         }
  20         buf.deleteCharAt(buf.length() - 1);
  21         return buf.toString();
  22     }
  23
  24     public static String toStringCondensed(byte[] bytes) {
  25         var buf = new StringBuffer();
  26         for (final var aByte : bytes) {
  27             appendHexChar(buf, aByte);
  28         }
  29         return buf.toString();
  30     }
  31
  32     private static void appendHexChar(StringBuffer buf, int b) {
  33         buf.append(HEX_DIGITS[(b >> 4) & 0xf]);
  34         buf.append(HEX_DIGITS[b & 0xf]);
  35     }
  36
  37     public static byte[] toByteArray(String s) {
  38         var len = s.length();
  39         var data = new byte[len / 2];
  40         for (var i = 0; i < len; i += 2) {
  41             data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4) + Character.digit(s.charAt(i + 1), 16));
  42         }
  43         return data;
  44     }
  45 }