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         StringBuffer buf = new StringBuffer();
  12         for (final byte aByte : bytes) {
  13             appendHexChar(buf, aByte);
  14             buf.append(" ");
  15         }
  16         return buf.toString();
  17     }
  18
  19     public static String toStringCondensed(byte[] bytes) {
  20         StringBuffer buf = new StringBuffer();
  21         for (final byte aByte : bytes) {
  22             appendHexChar(buf, aByte);
  23         }
  24         return buf.toString();
  25     }
  26
  27     private static void appendHexChar(StringBuffer buf, int b) {
  28         buf.append(HEX_DIGITS[(b >> 4) & 0xf]);
  29         buf.append(HEX_DIGITS[b & 0xf]);
  30     }
  31
  32     public static byte[] toByteArray(String s) {
  33         int len = s.length();
  34         byte[] data = new byte[len / 2];
  35         for (int i = 0; i < len; i += 2) {
  36             data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4) + Character.digit(s.charAt(i + 1), 16));
  37         }
  38         return data;
  39     }
  40 }