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  1. import java.util.Arrays;
  2.  
  3. public final class Main {
  4.  
  5.   static byte[] decode(final String enc) {
  6.     final long val = Long.parseLong(enc, 16);
  7.     final byte[] raw = new byte[] {
  8.       (byte) ((val & 0xff00000000000000L) >> 56),
  9.       (byte) ((val & 0xff000000000000L) >> 48),
  10.       (byte) ((val & 0xff0000000000L) >> 40),
  11.       (byte) ((val & 0xff00000000L) >> 32),
  12.       (byte) ((val & 0xff000000) >> 24),
  13.       (byte) ((val & 0xff0000) >> 16),
  14.       (byte) ((val & 0xff00) >> 8),
  15.       (byte) (val & 0xffL)
  16.     };
  17.     final int n = enc.length() >> 1;
  18.     final byte[] trimmed = new byte[n];
  19.     System.arraycopy(raw, 8 - n, trimmed, 0, n);
  20.     return trimmed;
  21.   }
  22.  
  23.   public static void main(final String[] argv) {
  24.     System.out.println(Arrays.equals(
  25.         new byte[] { (byte) 0x91, (byte) 0x92, (byte) 0x93, (byte) 0x94, (byte) 0x95 },
  26.         decode("9192939495")
  27.     ));
  28.   }
  29. }
Success #stdin #stdout 0.06s 215552KB
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Standard input is empty
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true
https://ideone.com/lqRDH
language:
Java (12.0.1)
created:
11 years ago
visibility:
public

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