--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/luan/lib/rpc/RpcCon.java	Sun Aug 06 20:11:11 2017 -0600
@@ -0,0 +1,108 @@
+package luan.lib.rpc;
+
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.io.IOException;
+import java.io.EOFException;
+import java.net.Socket;
+import java.nio.charset.StandardCharsets;
+import java.util.List;
+import luan.lib.parser.ParseException;
+import luan.lib.json.JsonParser;
+import luan.lib.json.JsonToString;
+
+
+public class RpcCon {
+	final Socket socket;
+	final InputStream in;
+	final OutputStream out;
+	InputStream inBinary = null;
+	long lenBinary = -1;
+
+	RpcCon(Socket socket) throws IOException {
+		this.socket = socket;
+		this.in = socket.getInputStream();
+		this.out = socket.getOutputStream();
+	}
+
+	public void close()
+		throws IOException
+	{
+		socket.close();
+	}
+
+	public boolean isClosed() {
+		return socket.isClosed();
+	}
+
+	void write(InputStream in,long lenIn,List list)
+		throws IOException
+	{
+		if( in != null )
+			list.add(0,lenIn);
+		String json = JsonToString.toString(list);
+		byte[] aJson = json.getBytes(StandardCharsets.UTF_8);
+		int len = aJson.length;
+		byte[] a = new byte[4+len];
+        a[0] = (byte)(len >>> 24);
+        a[1] = (byte)(len >>> 16);
+        a[2] = (byte)(len >>>  8);
+        a[3] = (byte)(len >>>  0);
+		System.arraycopy(aJson,0,a,4,len);
+		out.write(a);
+		if( in != null ) {
+			a = new byte[8192];
+			long total = 0;
+			int n;
+			while( (n=in.read(a)) != -1 ) {
+				out.write(a,0,n);
+				total += n;
+			}
+			if( total != lenIn )
+				throw new IOException("InputStream wrong length "+total+" when should be "+lenIn);
+		}
+	}
+
+	List readJson()
+		throws IOException
+	{
+		if( inBinary != null ) {
+			inBinary.close();
+			inBinary = null;
+			lenBinary = -1;
+		}
+		byte[] a = new byte[4];
+		readAll(a);
+		int len = 0;
+		for( byte b : a ) {
+			len <<= 8;
+			len |= b&0xFF;
+		}
+		a = new byte[len];
+		readAll(a);
+		String json = new String(a,StandardCharsets.UTF_8);
+		List list;
+		try {
+			list = (List)JsonParser.parse(json);
+		} catch(ParseException e) {
+			throw new IOException(e);
+		}
+		if( list.get(0) instanceof Long ) {
+			lenBinary = (Long)list.remove(0);
+			inBinary = new FixedLengthInputStream(in,lenBinary);
+		}
+		return list;
+	}
+
+	private void readAll(final byte[] a) throws IOException {
+		int total = 0;
+		int n;
+		while( total < a.length ){
+			n = in.read( a, total, a.length-total );
+			if( n == -1 )
+				throw new EOFException();
+			total += n;
+		}
+	}
+
+}