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 static final char[] HEX_DIGITS = {
   6             '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
   7     };
   8
   9     private Hex() {
  10     }
  11
  12     public static String toString(byte[] bytes) {
  13         if (bytes.length == 0) {
  14             return "";
  15         }
  16
  17         var buf = new StringBuffer();
  18         for (final var aByte : bytes) {
  19             appendHexChar(buf, aByte);
  20             buf.append(" ");
  21         }
  22         buf.deleteCharAt(buf.length() - 1);
  23         return buf.toString();
  24     }
  25
  26     public static String toStringCondensed(byte[] bytes) {
  27         var buf = new StringBuffer();
  28         for (final var aByte : bytes) {
  29             appendHexChar(buf, aByte);
  30         }
  31         return buf.toString();
  32     }
  33
  34     private static void appendHexChar(StringBuffer buf, int b) {
  35         buf.append(HEX_DIGITS[(b >> 4) & 0xf]);
  36         buf.append(HEX_DIGITS[b & 0xf]);
  37     }
  38
  39     public static byte[] toByteArray(String s) {
  40         var len = s.length();
  41         var data = new byte[len / 2];
  42         for (var i = 0; i < len; i += 2) {
  43             data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4) + Character.digit(s.charAt(i + 1), 16));
  44         }
  45         return data;
  46     }
  47 }