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

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