@Override
public synchronized void send(String type, Object... data) {
this.log("send(" + type + ", " + Arrays.asList(data) + ")");
Vector<Object> packet = new Vector<Object>(2);
packet.add(type);
for (Object v : data) packet.add(v);
try {
ByteArrayOutputStream baos = new ByteArrayOutputStream(4096);
BencodingOutputStream bos = new BencodingOutputStream(baos);
bos.writeCollection(packet);
bos.flush();
byte[] bytes = baos.toByteArray();
bos.close();
byte[] header = new byte[8];
int packetSize = bytes.length;
// (_, protocol_version, compression_level, packet_index, current_packet_size) =
// struct.unpack_from('!cBBBL', read_buffer)
header[0] = 'P';
header[1] = 0;
header[2] = 0;
// big endian size as 4 bytes:
for (int b = 0; b < 4; b++) header[4 + b] = (byte) ((packetSize >>> (24 - b * 8)) % 256);
this.debug(
"send(...) header=0x" + hexlify_raw(header) + ", payload is " + packetSize + " bytes");
this.outputStream.write(header);
this.outputStream.write(bytes);
this.outputStream.flush();
} catch (IOException e) {
this.connectionBroken(e);
}
}
/**
* Bencodes document
*
* @param doc Document to be bencoded
* @return Bencoded string of the provided document
* @throws LRException BENCODE_FAILED if document cannot be bencoded
*/
private String bencode(Map<String, Object> doc) throws LRException {
String text = "";
String encodedString = "";
// Bencode the provided document
try {
ByteArrayOutputStream s = new ByteArrayOutputStream();
BencodingOutputStream bencoder = new BencodingOutputStream(s);
bencoder.writeMap(doc);
bencoder.flush();
encodedString = s.toString();
s.close();
// Hash the bencoded document
MessageDigest md;
md = MessageDigest.getInstance("SHA-256");
md.update(encodedString.getBytes());
byte[] mdbytes = md.digest();
StringBuffer hexString = new StringBuffer();
for (int i = 0; i < mdbytes.length; i++) {
String hex = Integer.toHexString(0xFF & mdbytes[i]);
if (hex.length() == 1) {
hexString.append('0');
}
hexString.append(hex);
}
text = hexString.toString();
} catch (Exception e) {
throw new LRException(LRException.BENCODE_FAILED);
}
return text;
}