nodejs/test/simple/test-net-binary.js

var common = require('../common');
var assert = require('assert');
var net = require('net');

var binaryString = "";
for (var i = 255; i >= 0; i--) {
  var s = "'\\" + i.toString(8) + "'";
  var S = eval(s);
  common.error( s
       + " "
       + JSON.stringify(S)
       + " "
       + JSON.stringify(String.fromCharCode(i))
       + " "
       + S.charCodeAt(0)
       );
  process.assert(S.charCodeAt(0) == i);
  process.assert(S == String.fromCharCode(i));
  binaryString += S;
}

// safe constructor
var echoServer = net.Server(function (connection) {
  connection.setEncoding("binary");
  connection.addListener("data", function (chunk) {
    common.error("recved: " + JSON.stringify(chunk));
    connection.write(chunk, "binary");
  });
  connection.addListener("end", function () {
    connection.end();
  });
});
echoServer.listen(common.PORT);

var recv = "";

echoServer.addListener("listening", function() {
  var j = 0;
  var c = net.createConnection(common.PORT);

  c.setEncoding("binary");
  c.addListener("data", function (chunk) {
    if (j < 256) {
      common.error("write " + j);
      c.write(String.fromCharCode(j), "binary");
      j++;
    } else {
      c.end();
    }
    recv += chunk;
  });

  c.addListener("connect", function () {
    c.write(binaryString, "binary");
  });

  c.addListener("close", function () {
    console.dir(recv);
    echoServer.close();
  });
});

process.addListener("exit", function () {
  console.log("recv: " + JSON.stringify(recv));

  assert.equal(2*256, recv.length);

  var a = recv.split("");

  var first = a.slice(0,256).reverse().join("");
  console.log("first: " + JSON.stringify(first));

  var second = a.slice(256,2*256).join("");
  console.log("second: " + JSON.stringify(second));

  assert.equal(first, second);
});