RLP { public static byte[] encodeSet(Set<ByteArrayWrapper> data) { int dataLength = 0; Set<byte[]> encodedElements = new HashSet<>(); for (ByteArrayWrapper element : data) { byte[] encodedElement = RLP.encodeElement(element.getData()); dataLength += encodedElement.length; encodedElements.add(encodedElement); } byte[] listHeader = encodeListHeader(dataLength); byte[] output = new byte[listHeader.length + dataLength]; System.arraycopy(listHeader, 0, output, 0, listHeader.length); int cummStart = listHeader.length; for (byte[] element : encodedElements) { System.arraycopy(element, 0, output, cummStart, element.length); cummStart += element.length; } return output; }  static int decodeInt(byte[] data, int index); static long decodeLong(byte[] data, int index); static BigInteger decodeBigInteger(byte[] data, int index); static byte[] decodeIP4Bytes(byte[] data, int index); static int getFirstListElement(byte[] payload, int pos); static int getNextElementIndex(byte[] payload, int pos); static byte getCommandCode(byte[] data); static RLPList decode2(byte[] msgData, int depthLimit); static RLPList decode2(byte[] msgData); static RLPList unwrapList(byte[] msgData); static RLPElement decode2OneItem(byte[] msgData, int startPos); static DecodeResult decode(byte[] data, int pos); static LList decodeLazyList(byte[] data); static LList decodeLazyList(byte[] data, int pos, int length); static byte[] encode(Object input); static byte[] encodeLength(int length, int offset); static byte[] encodeByte(byte singleByte); static byte[] encodeShort(short singleShort); static byte[] encodeInt(int singleInt); static byte[] encodeString(String srcString); static byte[] encodeBigInteger(BigInteger srcBigInteger); static byte[] encodeElement(byte[] srcData); static int calcElementPrefixSize(byte[] srcData); static byte[] encodeListHeader(int size); static byte[] encodeLongElementHeader(int length); static byte[] encodeSet(Set<ByteArrayWrapper> data); static byte[] wrapList(byte[] ... data); static byte[] encodeList(byte[]... elements); static final byte[] EMPTY_ELEMENT_RLP; }
@Test public void testEncodeSet_2(){ Set<ByteArrayWrapper> data = new HashSet<>(); byte[] setEncoded = encodeSet(data); assertEquals("c0", Hex.toHexString(setEncoded)); }