dst[ dstIndex++ ] = (byte) ( ( val >> 8 ) & 0xFF );
        dst[ dstIndex ] = (byte) ( val & 0xFF );
    }


    static void writeInt4 ( int val, byte[] dst, int dstIndex ) {
        dst[ dstIndex++ ] = (byte) ( ( val >> 24 ) & 0xFF );
        dst[ dstIndex++ ] = (byte) ( ( val >> 16 ) & 0xFF );
        dst[ dstIndex++ ] = (byte) ( ( val >> 8 ) & 0xFF );
        dst[ dstIndex ] = (byte) ( val & 0xFF );
    }

        dst[dstIndex++] = (byte)(( val >> 8 ) & 0xFF );
        dst[dstIndex] = (byte)( val & 0xFF );
    }
    static void writeInt4( int val, byte[] dst, int dstIndex ) {
        dst[dstIndex++] = (byte)(( val >> 24 ) & 0xFF );
        dst[dstIndex++] = (byte)(( val >> 16 ) & 0xFF );
        dst[dstIndex++] = (byte)(( val >> 8 ) & 0xFF );
        dst[dstIndex] = (byte)( val & 0xFF );
    }

    val version = fromSource.readByte() and 0xff
    if (version != VERSION_5) throw ProtocolException("unexpected version: $version")

    val command = fromSource.readByte() and 0xff

    val reserved = fromSource.readByte() and 0xff
    if (reserved != 0) throw ProtocolException("unexpected reserved: $reserved")

    val addressType = fromSource.readByte() and 0xff
    val toAddress =
      when (addressType) {

        return ( src[ srcIndex ] & 0xFF ) + ( ( src[ srcIndex + 1 ] & 0xFF ) << 8 );
    }


    public static int readInt4 ( byte[] src, int srcIndex ) {
        return ( src[ srcIndex ] & 0xFF ) + ( ( src[ srcIndex + 1 ] & 0xFF ) << 8 ) + ( ( src[ srcIndex + 2 ] & 0xFF ) << 16 )
                + ( ( src[ srcIndex + 3 ] & 0xFF ) << 24 );
    }

        key8[ 1 ] = (byte) ( ( key[ 0 ] << 7 ) | ( ( key[ 1 ] & 0xFF ) >>> 1 ) );
        key8[ 2 ] = (byte) ( ( key[ 1 ] << 6 ) | ( ( key[ 2 ] & 0xFF ) >>> 2 ) );
        key8[ 3 ] = (byte) ( ( key[ 2 ] << 5 ) | ( ( key[ 3 ] & 0xFF ) >>> 3 ) );
        key8[ 4 ] = (byte) ( ( key[ 3 ] << 4 ) | ( ( key[ 4 ] & 0xFF ) >>> 4 ) );
        key8[ 5 ] = (byte) ( ( key[ 4 ] << 3 ) | ( ( key[ 5 ] & 0xFF ) >>> 5 ) );

    var accumulatorBitCount = 0
    for (i in 0 until byteCount) {
      val byteIn = source.readByte() and 0xff
      accumulator = accumulator shl 8 or byteIn
      accumulatorBitCount += 8
      while (accumulatorBitCount >= 8) {
        val childIndex = (accumulator ushr (accumulatorBitCount - 8)) and 0xff
        node = node.children!![childIndex]!!
        if (node.children == null) {
          // Terminal node.

            block = (ALPHABET.indexOf(string.charAt(i++)) & 0xff) << 18 |
                    (ALPHABET.indexOf(string.charAt(i++)) & 0xff) << 12 |
                    (ALPHABET.indexOf(string.charAt(i++)) & 0xff) << 6 |
                    (ALPHABET.indexOf(string.charAt(i++)) & 0xff);
            buffer[index++] = (byte) (block >>> 16);
            if (index < size) buffer[index++] = (byte) ((block >>> 8) & 0xff);

    static int readULong ( byte[] src, int index ) {
        return ( src[ index ] & 0xff ) | ( ( src[ index + 1 ] & 0xff ) << 8 ) | ( ( src[ index + 2 ] & 0xff ) << 16 )
                | ( ( src[ index + 3 ] & 0xff ) << 24 );
    }


    static int readUShort ( byte[] src, int index ) {
        return ( src[ index ] & 0xff ) | ( ( src[ index + 1 ] & 0xff ) << 8 );
    }

   *
   * @throws IOException if an I/O error occurs
   */
  @Override
  public void writeInt(int v) throws IOException {
    out.write(0xFF & v);
    out.write(0xFF & (v >> 8));
    out.write(0xFF & (v >> 16));
    out.write(0xFF & (v >> 24));
  }

  /**
   * Writes a {@code long} as specified by {@link DataOutputStream#writeLong(long)}, except using
   * little-endian byte order.
   *

  }

  public void testFull() {
    // Test 32 byte array of 0xFF.
    byte[] fulls = new byte[32];
    Arrays.fill(fulls, (byte) 0xFF);
    assertCrc(0x62a8ab43, fulls);
  }

  public void testFull100() {
    // Test 100 byte array of 0xFF.
    byte[] fulls = new byte[100];
    Arrays.fill(fulls, (byte) 0xFF);
    assertCrc(0xbc753add, fulls);
  }

  public void testAscending() {