libjava/testsuite/libjava.lang/utilTest.java

   1 class utilTest {
   2
   3   public static void main(String[] argv) throws Throwable {
   4     byte[] b = new byte[] {
   5       0x01, 0x23, 0x45, 0x67, (byte) 0x89, (byte) 0xab,
   6       (byte) 0xcd, (byte) 0xef
   7     };
   8     String s = "0123456789ABCDEF";
   9     System.out.println(toString(b));
  10     System.out.println(s);
  11     System.out.println(toString(toBytesFromString(s)));
  12   }
  13
  14   // The following comes from the GNU Crypto project gnu.crypto.util.Util
  15
  16   private static final char[] HEX_DIGITS = {
  17     '0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'
  18   };
  19
  20   public static byte[] toBytesFromString(String s) {
  21     int limit = s.length();
  22     byte[] result = new byte[((limit + 1) / 2)];
  23     int i = 0, j = 0;
  24     if ((limit % 2) == 1) {
  25       result[j++] = (byte) fromDigit(s.charAt(i++));
  26     }
  27     while (i < limit) {
  28       result[j++] =
  29         (byte)((fromDigit(s.charAt(i++)) << 4) | fromDigit(s.charAt(i++)));
  30     }
  31     return result;
  32   }
  33
  34   public static int fromDigit(char c) {
  35     if (c >= '0' && c <= '9') {
  36       return c - '0';
  37     } else if (c >= 'A' && c <= 'F') {
  38       return c - 'A' + 10;
  39     } else if (c >= 'a' && c <= 'f') {
  40       return c - 'a' + 10;
  41     } else
  42       throw new IllegalArgumentException("Invalid hexadecimal digit: " + c);
  43   }
  44
  45   public static String toString(byte[] ba) {
  46     return toString(ba, 0, ba.length);
  47   }
  48
  49   public static final String toString(byte[] ba, int offset, int length) {
  50     char[] buf = new char[length * 2];
  51     for (int i = 0, j = 0, k; i < length; ) {
  52       k = ba[offset + i++];
  53       buf[j++] = HEX_DIGITS[(k >>> 4) & 0x0F];
  54       buf[j++] = HEX_DIGITS[ k        & 0x0F];
  55     }
  56     return new String(buf);
  57   }
  58 }