public void close() throws IOException {
synchronized (closeLock) {
if (closed) {
return;
}
socketOutput.close();
socketInput.close();
socket.close();
closed = true;
}
}
public byte[] readPacket() throws IOException {
if (!isOpen()) {
throw new ClosedConnectionException("connection is closed");
}
synchronized (receiveLock) {
int b1, b2, b3, b4;
// length
try {
b1 = socketInput.read();
b2 = socketInput.read();
b3 = socketInput.read();
b4 = socketInput.read();
} catch (IOException ioe) {
if (!isOpen()) {
throw new ClosedConnectionException("connection is closed");
} else {
throw ioe;
}
}
// EOF
if (b1 < 0) {
return new byte[0];
}
if (b2 < 0 || b3 < 0 || b4 < 0) {
throw new IOException("protocol error - premature EOF");
}
int len = ((b1 << 24) | (b2 << 16) | (b3 << 8) | (b4 << 0));
if (len < 0) {
throw new IOException("protocol error - invalid length");
}
byte b[] = new byte[len];
b[0] = (byte) b1;
b[1] = (byte) b2;
b[2] = (byte) b3;
b[3] = (byte) b4;
int off = 4;
len -= off;
while (len > 0) {
int count;
try {
count = socketInput.read(b, off, len);
} catch (IOException ioe) {
if (!isOpen()) {
throw new ClosedConnectionException("connection is closed");
} else {
throw ioe;
}
}
if (count < 0) {
throw new IOException("protocol error - premature EOF");
}
len -= count;
off += count;
}
return b;
}
}